Common use of Notices to Company and Warrant Agent Clause in Contracts

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate to or on the Company shall be sufficiently given or made if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO Communications, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 Facsimile: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made when delivered by hand, or one Business Day if sent by certified overnight courier service (with next day delivery specified), or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsTidewater Inc. 000 Xxxxxxx Xx. Xxxxx 0000 Xxx Xxxxxxx, Inc. 10000 Xxxxxx Xxxxxxxxx 00000 Fax: 0.000.000.0000 Attn: Xxxxx Xxxx XxxxxxX. Xxxxxxxxx, Xxxxxxxx 00000 Facsimile: (000) 000-0000 Attention: Executive Vice President, General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Secretary Email: xxxxxxxxxx@xxx.xxx Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: Computershare Trust Company, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 N.A. Computershare Inc. 000 Xxxxxx Xxxx Xxx XxxxXxxxxx Canton, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 MA 02021 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Client Services

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by facsimile or other electronic means), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination of such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsGulfMark Offshore, Inc. 10000 Xxxxxx Xxxxx 000 Xxxx XxxxxxXxx Xxxxxxx Parkway North, Xxxxxxxx 00000 Suite 400 Houston, Texas 77024 Facsimile: (000) 000-0000 Attention: General Counsel Xxxxx X. Xxxxxxxx Email: xxxxx.xxxxxxxx@xxxxxxxx.xxx If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Company, LLC 0000 00 Xxxxxx Xxxx Xxx XxxxXxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.: (000) 000-0000 Attention: Xxxxxx Xxxxxxx Email: XXxxxxxx@xxxxxxxxxxxx.xxx The Warrant Agent for XO Communications, Inc. If maintains the Warrant Agent shall receive any notice or demand addressed to Agent’s Principal Office at the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companyabove address.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made when delivered by hand, or one Business Day if sent by certified overnight courier service (with next day delivery specified), or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsPHI Group, Inc. 10000 Xxxxxx 2001 SE Xxxxxxxxxx Thruway Lafayette, LA, 70508 Attn: Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileXxXxxxxxxxxxx Email: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. xxxxxxxxxxxxxx@xxxxxxxxx.xxx Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Company, LLC 0000 00xx Xxxxxx Xxxx Xxx XxxxBrooklyn, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 NY 11219 Attention: Warrant Agent for XO Communications, Inc. If Relationship Management Unless the Warrant Agent shall receive is a Global Warrant, any notice or demand addressed communication mailed to a Holder shall be mailed to the Company by Holder at the holder Holder’s address as it appears on the Warrant Register and shall be sufficiently given if so mailed within the time prescribed. Any notice to the owners of a beneficial interest in a Global Warrant Certificate pursuant shall be distributed through the Depositary in accordance with the procedures of the Depositary. Communications to such Holder shall be deemed to be effective at the time of dispatch to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such Depositary. Failure to provide a notice or demand communication to the Companya Holder or any defect in it shall not affect its sufficiency with respect to other Holders.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Class A Warrant Certificate to or on the Company to be effective shall be sufficiently in writing (including by facsimile), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination of such notice), or five (5) days after being deposited in the mail, return receipt requestedfirst class and postage prepaid or, or by nationally recognized overnight courier servicein the case of facsimile notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsPrimus Telecommunications Group, Inc. 10000 Incorporated 0000 Xxxxx Xxxxxx Xxxxx Drive, Suite 900 McLean, Virginia 22102 Attention: Xxxx Xxxxxx, Xxxxxxxx 00000 X. XxXxxxxxx Facsimile: (000) 000-0000 Attention: General Counsel If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Class A Warrant Certificate to or on the Warrant Agent shall be sufficiently given if sent by certified mailin the same manner as notices, return receipt requested, requests or by nationally recognized overnight courier service, demands are to be given or made to or on the Company (as set forth above) addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: StockTrans, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Inc. 00 Xxxx Xxxxxxxxx Xxxxxx Xxxx Xxx XxxxXxxxxxx, Xxx Xxxx Xxxxxxxxxxxx 00000 Facsimile No.Attention: Xxxxxx X. Xxxxxxxx Facsimile: (000) 000-0000 Attention: The Warrant Agent for XO Communications, Inc. If the maintains a Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant CertificatesOffice at 00 Xxxx Xxxxxxxxx Xxxxxx, the Warrant Agent shall promptly forward such notice or demand to the CompanyXxxxxxx, Xxxxxxxxxxxx 00000.

Notices to Company and Warrant Agent. Any notice or demand communication authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on by the Company to the Company or the Warrant Agent, as the case may be, shall be sufficiently given or made if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed in writing and delivered in person, mailed by the Company with the Warrant Agent), first-class mail or sent by facsimile transmission with receipt confirmed, or by personal delivery addressed as follows: XO CommunicationsIf to the Company: ITC^DeltaCom, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx0000 X.X. Xxxxxxx Drive West Point, Xxxxxxxx 00000 FacsimileGeorgia 31833 Facsimile No.: (000) 000-0000 Attention: General Counsel If to the Warrant Agent: Mellon Investor Services LLC 000 Xxxxxxxx Xxxxxxx, Xxxxx 0000 Xxxxxxx, Xxxxxxx 00000 Attention: Client Services Manager Fax: 000-000-0000 Attention: Relationship Manager With a copy to: Mellon Investor Services LLC 00 Xxxxxxxxxx Xxxx Xxxxxxxxxx Xxxx, Xxx Xxxxxx 00000-0000 Facsimile No.: (000) 000-0000 Attention: General Counsel In case the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. The Company or the Warrant Agent by notice to the other may designate additional or different addresses for subsequent notices or communications. Any notice pursuant or communication mailed to this Agreement a Holder shall be mailed to such Holder at its address as it appears on the Warrant Register by first-class mail and shall be sufficiently given by to such Holder if so mailed within the Company or by any registered holder time prescribed. Copies of any Warrant Certificate such communication or notice to a Holder shall also be mailed to the Warrant Agent at the same time. Failure to transmit a notice or communication to a Holder as provided herein or any defect in any such notice shall not affect its sufficiency with respect to other Holders. Except for a notice to the Warrant Agent, which is deemed given only when received, and except as otherwise provided in this Agreement, if a notice or communication is mailed in the manner provided in this Section 11, it is duly given, whether or not the addressee receives it. Where this Agreement provides for notice in any manner, such notice may be sufficiently given if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed waived in writing by the Warrant Agent Person entitled to receive such notice, either before or after the event, and such waiver shall be the equivalent of such notice. Waivers of notice by Holders shall be filed with the Company)Warrant Agent, but such filing shall not be a condition precedent to the validity of any action taken in reliance upon such waiver. In case by reason of the suspension of regular mail service or by facsimile transmission reason of any other cause it shall be impracticable to give such notice by mail, then such notification as shall be made with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If approval of the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of constitute a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companysufficient notification for every purpose hereunder.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made when delivered by hand, or one Business Day if sent by certified overnight courier service (with next day delivery specified), or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsPHI Group, Inc. 10000 Xxxxxx 0000 XX Xxxxxxxxxx Xxxxxxx Lafayette, LA, 70508 Attn: Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileXxXxxxxxxxxxx Email: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Company, LLC 0000 00xx Xxxxxx Xxxx Xxx XxxxXxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If Relationship Management Unless the Warrant Agent shall receive is a Global Warrant, any notice or demand addressed communication mailed to a Holder shall be mailed to the Company by Holder at the holder Holder’s address as it appears on the Warrant Register and shall be sufficiently given if so mailed within the time prescribed. Any notice to the owners of a beneficial interest in a Global Warrant Certificate pursuant shall be distributed through the Depositary in accordance with the procedures of the Depositary. Communications to such Holder shall be deemed to be effective at the time of dispatch to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such Depositary. Failure to provide a notice or demand communication to the Companya Holder or any defect in it shall not affect its sufficiency with respect to other Holders.

Notices to Company and Warrant Agent. Any notice or demand authorized or permitted by this Warrant Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate Holder to or on the Company to be effective shall be sufficiently in writing (including by facsimile), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination of such notice), or five (5) days after being deposited in the mail, return receipt requestedfirst class and postage prepaid or, or by nationally recognized overnight courier servicein the case of facsimile notice, when received, addressed as follows (until another address or facsimile number is filed in writing by the Company with the Warrant Agent)): Dynegy Inc. 000 Xxxxxx Xxxxxx Suite 1400 Houston, or by facsimile transmission with receipt confirmed, or by personal delivery as followsTX 77002 Attention: XO Communications, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileGeneral Counsel Fax: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice or demand pursuant to this Warrant Agreement to be given by the Company or by any registered holder of any Warrant Certificate Holder to the Warrant Agent shall be sufficiently given if sent in the same manner as notices or demands are to be given or made to or on the Company (except for Warrant Exercise Notices, which shall be delivered in accordance with Section 7) to the Warrant Agent at the office maintained by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed the Warrant Agent (the “Warrant Agent Office”) as follows (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (which other address shall become the “address of the Warrant Agent Office”Office for the purposes of this Agreement): American Stock Transfer & Trust Company 50 Computershare 000 Xxxxxxxxxx Xxxx. Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx Xxxxxx, 00000 Facsimile NoAttention: Corporate Actions Dept., 27th Floor Fax: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.0000

Notices to Company and Warrant Agent. Any notice or demand communication authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on by the Company to the Company or the Warrant Agent, as the case may be, shall be sufficiently given or made if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed in writing and delivered in person, mailed by the Company with the Warrant Agent), first-class mail or sent by facsimile transmission with receipt confirmed, or by personal delivery addressed as follows: XO CommunicationsIf to the Company: ITC/\DeltaCom, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx0000 X.X. Xxxxxxx Drive West Point, Xxxxxxxx 00000 FacsimileGeorgia 31833 Facsimile No.: (000) 000-0000 Attention: General Counsel If to the Warrant Agent: Mellon Investor Services LLC 000 Xxxxxxxx Xxxxxxx, Xxxxx 0000 Xxxxxxx, Xxxxxxx 00000 Attention: Client Services Manager Fax: 000-000-0000 Attention: Relationship Manager With a copy to: Mellon Investor Services LLC 00 Xxxxxxxxxx Xxxx Xxxxxxxxxx Xxxx, Xxx Xxxxxx 00000-0000 Facsimile No.: (000) 000-0000 Attention: General Counsel In case the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. The Company or the Warrant Agent by notice to the other may designate additional or different addresses for subsequent notices or communications. Any notice pursuant or communication mailed to this Agreement a Holder shall be mailed to such Holder at its address as it appears on the Warrant Register by first-class mail and shall be sufficiently given by to such Holder if so mailed within the Company or by any registered holder time prescribed. Copies of any Warrant Certificate such communication or notice to a Holder shall also be mailed to the Warrant Agent at the same time. Failure to transmit a notice or communication to a Holder as provided herein or any defect in any such notice shall not affect its sufficiency with respect to other Holders. Except for a notice to the Warrant Agent, which is deemed given only when received, and except as otherwise provided in this Agreement, if a notice or communication is mailed in the manner provided in this Section 11, it is duly given, whether or not the addressee receives it. Where this Agreement provides for notice in any manner, such notice may be sufficiently given if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed waived in writing by the Warrant Agent Person entitled to receive such notice, either before or after the event, and such waiver shall be the equivalent of such notice. Waivers of notice by Holders shall be filed with the Company)Warrant Agent, but such filing shall not be a condition precedent to the validity of any action taken in reliance upon such waiver. In case by reason of the suspension of regular mail service or by facsimile transmission reason of any other cause it shall be impracticable to give such notice by mail, then such notification as shall be made with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If approval of the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of constitute a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companysufficient notification for every purpose hereunder.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO Communications, Inc. 10000 Halcón Resources Corporation 0000 Xxxxxxxxx Xxxxxx Xxxxx Xxxx Xxxxxx0000 Xxxxxxx, Xxxxxxxx Xxxxx 00000 FacsimileFax: (000) 000-0000 AttentionAttn: General Counsel Xxxxx X. Xxxxxxx Email: xxxxxxxx@xxxxxxxxxxxxxxx.xxx If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: U.S. Bank National Association 0000 Xxx Xxxxxx Suite 1150 Houston, or by personal delivery as follows (the “Texas 77056 Fax: 000.000.0000 Attn: Xxxxxx X. Xxxxxxx Email: xxxxxx.xxxxxxx@xxxxxx.xxx The Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If maintains the Warrant Agent shall receive any notice or demand addressed to Agent’s Principal Office at the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companyabove address.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company to be effective shall be sufficiently in writing (including by e-mail), and shall be deemed to have been duly given or made when delivered by hand or e-mail, or one (1) Business Day if sent by certified overnight courier service (with next day delivery specified), or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination such notice), or five (5) Business Days after being deposited in the mail, return receipt requestedor, or by nationally recognized overnight courier servicein the case of email notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsXxxxxxxx Offshore Services, Inc. 10000 Xxxxxx 000 Xxxxxxxxx Xxxx., Xxxxx Xxxx Xxxxxx000 Covington, Xxxxxxxx 00000 Facsimile: (000) 000-0000 LA 70433 Attention: Xxxxx X. Xxxx, Xx., Executive Vice President and Chief Financial Officer Xxxxxx X. Xxxxxxx, Executive Vice President, General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Chief Compliance Officer Email: xxxxx.xxxx@xxxxxxxxxxxxxxxx.xxx xxxxxx.xxxxxxx @xxxxxxxxxxxxxxxx.xxx Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified overnight courier service or first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: Computershare, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Inc. Computershare Trust Company 50 Company, N.A. 000 Xxxxxx Xxxx Xxx XxxxXxxxxx Canton, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 MA 02021 Attention: Warrant Agent for XO Communications, Inc. If Client Services Unless the Warrant Agent shall receive is represented by a Global Warrant Certificate, any notice or demand addressed communication mailed to a Holder shall be mailed to the Company by Holder at the holder Holder’s address as it appears on the Warrant Register and shall be sufficiently given if so mailed within the time prescribed. Any notice to the owners of a beneficial interest in a Warrant represented by a Global Warrant Certificate pursuant shall be distributed through the Depository in accordance with the procedures of the Depository. Communications to such Holder shall be deemed to be effective at the time of dispatch to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such Depository. Failure to provide a notice or demand communication to the Companya Holder or any defect in it shall not affect its sufficiency with respect to other Holders.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by facsimile or other electronic means), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsGulfMark Offshore, Inc. 10000 Xxxxxx Xxxxx 000 Xxxx XxxxxxXxx Xxxxxxx Parkway North, Xxxxxxxx 00000 Suite 400 Houston, Texas 77024 Facsimile: (000) 000-0000 Attention: General Counsel Xxxxx X. Xxxxxxxx Email: xxxxx.xxxxxxxx@xxxxxxxx.xxx If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first- class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 LLC 0000 00 Xxxxxx Xxxx Xxx XxxxXxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.: (000) 000-0000 Attention: Xxxxxx Xxxxxxx Fax: [●] Email: [●] The Warrant Agent for XO Communications, Inc. If maintains the Warrant Agent shall receive any notice or demand addressed to Agent’s Principal Office at the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companyabove address.

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on the Company shall be sufficiently given or made five Business Days after being deposited in the mail, first class or registered, postage prepaid; when received if personally delivered; when transmitted if transmitted by telecopy upon receipt of telephonic or electronic confirmation; and the day after it is sent, if sent for next day delivery to a domestic address by certified mail, return receipt requested, or by nationally recognized overnight courier servicedelivery service (e.g., addressed (until another address is filed in writing by the Company with the Warrant AgentFederal Express). In each case, or by facsimile transmission with receipt confirmed, or by personal delivery as followsnotice shall be sent to: XO Communications, Inc. 10000 Crown Castle International Corp. 000 Xxxxxx Xxxxx Xxxx XxxxxxXxxxx 000 Xxxxxxx, Xxxxxxxx XX 00000 FacsimileTelecopier No.: (000) 000-0000 Attention: General Counsel If Chief Financial Officer In case the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder the Holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given five days after being deposited in the mail, first-class or registered, postage prepaid; when received if personally delivered; when transmitted if transmitted by telecopy upon receipt of telephonic or electronic confirmation; the day after it is sent, if sent for next day delivery to a domestic address by recognized overnight delivery service (e.g., Federal Express); and upon receipt, if sent by certified or registered mail, return receipt requested. In each case, or by nationally recognized overnight courier service, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & notice shall be sent to: United States Trust Company 50 of New York 000 Xxxx 00/xx/ Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile 00000-0000 Telecopier No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Corporate Trust Administration

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company to be effective shall be sufficiently in writing (including by e- mail), and shall be deemed to have been duly given or made when delivered by hand or e-mail, or one (1) Business Day if sent by certified overnight courier service (with next day delivery specified), or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination such notice), or five (5) Business Days after being deposited in the mail, return receipt requestedor, or by nationally recognized overnight courier servicein the case of email notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsXxxxxxxx Offshore Services, Inc. 10000 Xxxxxx 000 Xxxxxxxxx Xxxx., Xxxxx Xxxx Xxxxxx000 Covington, Xxxxxxxx 00000 Facsimile: (000) 000-0000 LA 70433 Attention: Xxxxx X. Xxxx, Xx., Executive Vice President and Chief Financial Officer Xxxxxx X. Xxxxxxx, Executive Vice President, General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Chief Compliance Officer Email: xxxxx.xxxx@xxxxxxxxxxxxxxxx.xxx xxxxxx.xxxxxxx @xxxxxxxxxxxxxxxx.xxx Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified overnight courier service or first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: Computershare, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Inc. Computershare Trust Company 50 Company, N.A. 000 Xxxxxx Xxxx Xxx XxxxXxxxxx Canton, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 MA 02021 Attention: Warrant Agent for XO Communications, Inc. If Client Services Unless the Warrant Agent shall receive is represented by a Global Warrant Certificate, any notice or demand addressed communication mailed to a Holder shall be mailed to the Company by Holder at the holder Holder’s address as it appears on the Warrant Register and shall be sufficiently given if so mailed within the time prescribed. Any notice to the owners of a beneficial interest in a Warrant represented by a Global Warrant Certificate pursuant shall be distributed through the Depository in accordance with the procedures of the Depository. Communications to such Holder shall be deemed to be effective at the time of dispatch to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such Depository. Failure to provide a notice or demand communication to the Companya Holder or any defect in it shall not affect its sufficiency with respect to other Holders.

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any the registered holder of any Warrant Certificate to or on the Company shall be sufficiently given or made when and if sent by certified deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsPCA International, Inc. 10000 Xxxxxx Xxxxx 000 Xxxxxxxx-Mint Xxxx XxxxxxRoad Matthews, Xxxxxxxx 00000 FacsimileNorth Carolina 28105 Attention: Chief Financial Officer Facsimile No.: (000) 000-0000 with a copy to: Xxxx, Weiss, Rifkind, Xxxxxxx & Xxxxxxxx 1285 Avenue of the Americas Xxx Xxxx, Xxx Xxxx 00000-0000 Attention: General Counsel If Xxxxxxx Xxxxxxxx, Esq. Facsimile No.: (000) 000-0000 In case the Company fails shall fall to maintain such office or agency or fails shall fall to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any the registered holder holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given when and if sent by certified deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & as follows: United States Trust Company 50 Xxxxxx of New York 000 Xxxx 00xx Xxxxxx, 00xx Xxxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.XX 00000-0000 Attention: Corporate Trust Administration Facsimile: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.0000

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination of such notice), or five days after being deposited in the mail, return receipt requestedor, or by nationally recognized overnight courier servicein the case of telecopy notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO Communicationsc/o Nortek, Inc. 10000 Xxxxxx 00 Xxxxxxx Xxxxx Xxxx XxxxxxProvidence, Xxxxxxxx 00000 RI 02903-2603 Attention: General Counsel Telephone: (000) 000-0000 Facsimile: (000) 000-0000 with a copy to: Weil, Gotshal & Xxxxxx LLP 000 Xxxxx Xxxxxx Xxx Xxxx, XX 00000 Attention: General Counsel Xxxxxxx X. Xxxxx, Esq. Telephone: (000) 000-0000 Facsimile: (000) 000-0000 If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: U.S. Bank National Association Xxx Xxxxxxx Xxxxxx, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx 0xx Xxxxx Xxxxxx, XX 00000 Attention: Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.Xxxxxxx Telephone: (000) 000-0000 AttentionFacsimile: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.(000) 000-0000

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any the registered holder of any Warrant Certificate to or on behalf of the Company shall be sufficiently given or made when received if sent by certified deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsFrench Fragrances, Inc. 10000 00000 XX 00xx Xxxxxx Xxxxx Xxxx XxxxxxXxxxx, Xxxxxxxx Xxxxxxx 00000 FacsimileTelecopier No.: (000) 000-0000 Attention: General Counsel If Oscar Marina, Esq. With a copy to: Xxxx Xxxxxxx & Xxxxxx 000 Xxxxx Xxxxxx Xxx Xxxx, Xxx Xxxx 00000 Telephone No.: (000) 000-0000 Attention: Xxx Xxxxxx, Esq. In case the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any the registered holder holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given when and if sent by certified deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 as follows: Mellon Investor Services LLC 1 Mellon Bank Center 000 Xxxxx Xxxxxx Xxxx Xxx Xxxx0000 Xxxxxxxxxx, Xxx Xxxx XX 00000 Facsimile Telecopier No.: (000) 000-0000 Attention: Warrant Agent for XO CommunicationsRelationship Manager With a copy to: Credit Suisse First Boston Corporation 000 Xxxx Xxxxxx Xxx Xxxx, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of Xxx Xxxx 00000 Telephone No.: (000) 000-0000 Attention: Xxxxxxx Xxxxxxxx With a Warrant Certificate pursuant to the provisions of the Warrant Certificatescopy to: Xxxxxx & Xxxxxxx 000 Xxxxx Xxxxxx Xxx Xxxx, the Warrant Agent shall promptly forward such notice or demand to the CompanyXxx Xxxx 00000 Telephone No.: (000) 000-0000 Attention: Xxxx Xxxxx, Esq.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate to or on the Company to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or ____business days after being delivered to a recognized courier (whose stated terms of delivery are ____ business days or less to the destination such notice), or ____ business days after being deposited in the mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier serviceor, in the case of telecopy notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsApollo Medical Holdings, Inc. 10000 Xxxxxx 700 Xxxxx Xxxx XxxxxxXxxxx Xxxx, Xxxxxxxx Xxxxx000 Xxxxxxxx, Xxxxxxxxxx 00000 FacsimileTel: (000) 000-0000 Fax: (000) 000-0000 Attn: Wxxxxx Xxxxxxxxxx, Chief Executive Officer With a copy (which shall not constitute notice) to: Shartsis Fxxxxx LLP Oxx Xxxxxxxx Xxxxx Xxxxxxxxxx Xxxxx Xxx Xxxxxxxxx, XX 00000 Tel: (000) 000-0000 Fax:(000) 000-0000 Attention: General Counsel P. Rxxxxx Xxxxxxx, Esq. If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.follows:

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Class B Warrant Certificate to or on the Company to be effective shall be sufficiently in writing (including by facsimile), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination of such notice), or five (5) days after being deposited in the mail, return receipt requestedfirst class and postage prepaid or, or by nationally recognized overnight courier servicein the case of facsimile notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsPrimus Telecommunications Group, Inc. 10000 Incorporated 0000 Xxxxx Xxxxxx Xxxxx Drive, Suite 900 McLean, Virginia 22102 Attention: Xxxx Xxxxxx, Xxxxxxxx 00000 X. XxXxxxxxx Facsimile: (000) 000-0000 Attention: General Counsel If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Class B Warrant Certificate to or on the Warrant Agent shall be sufficiently given if sent by certified mailin the same manner as notices, return receipt requested, requests or by nationally recognized overnight courier service, demands are to be given or made to or on the Company (as set forth above) addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: StockTrans, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Inc. 00 Xxxx Xxxxxxxxx Xxxxxx Xxxx Xxx XxxxXxxxxxx, Xxx Xxxx Xxxxxxxxxxxx 00000 Facsimile No.Attention: Xxxxxx X. Xxxxxxxx Facsimile: (000) 000-0000 Attention: The Warrant Agent for XO Communications, Inc. If the maintains a Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant CertificatesOffice at 00 Xxxx Xxxxxxxxx Xxxxxx, the Warrant Agent shall promptly forward such notice or demand to the CompanyXxxxxxx, Xxxxxxxxxxxx 00000.

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on the Company shall be sufficiently given or made if sent by certified (i) five business days after deposited in the mail, return first class or registered, postage prepaid, (ii) one business day after being timely delivered to a next-day air courier or (ii) when receipt requestedis acknowledged by the addressee, or by nationally recognized overnight courier serviceif telecopied, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO Communications, Inc. 10000 Focal Communications Corporation 000 Xxxxx XxXxxxx Xxxxxx Xxxxx Xxxx Xxxxxx0000 Xxxxxxx, Xxxxxxxx 00000 FacsimileTelecopy: (000) 000-0000 Telephone: (000) 000-0000 Attention: General Counsel If Chief Financial Officer In case the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder the Holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified or made (i) five business days after deposited in the mail, return first-class or registered, postage prepaid, (ii) one business day after being timely delivered to a next-day air courier or (ii) when receipt requestedis acknowledged by the addressee, or by nationally recognized overnight courier serviceif telecopied, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & as follows: 29 Computershare Trust Company 50 of New York Wall Street Plaza 00 Xxxx Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.Facsimile: (000) 000-0000 Attention: Warrant Agent for XO CommunicationsGeneral Manager WITH A COPY TO: Computershare Investor Services, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant CertificatesLLC Xxx Xxxxx XxXxxxx Xxxxxx Xxxxxxx, the Warrant Agent shall promptly forward such notice or demand to the Company.Xxxxxxxx 00000 Facsimile: (000) 000-0000 Attention: Relationship Manager

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsBasic Energy Services, Inc. 10000 000 Xxxxxx Xxxxxx Xxxxx 0000 Xxxx XxxxxxXxxxx, Xxxxxxxx Xxxxx 00000 FacsimileFax: (000) -000-0000 AttentionAttn: General Counsel Xxxx Xxx Email: Xxxxx.Xxx@XxxxxXxxxxxXxxxxxxx.xxx If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Company, LLC 0000 00xx Xxxxxx Xxxx Xxx XxxxXxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.Fax: (000) -000-0000 AttentionAttn: Xxx Xxxxxx Email: Xxxxxxxxxxxxx@xxxxxxx.xxx The Warrant Agent for XO Communications, Inc. If maintains the Warrant Agent shall receive any notice or demand addressed to Agent’s Principal Office at the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companyabove address.

Notices to Company and Warrant Agent. Any notice or demand authorized or required by this Warrant Agent Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on the Company shall will be sufficiently given or made when and if sent by certified deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsOglebay Norton Company North Point Tower 0000 Xxxxxxxx Xxxxxx Xxxxxxxxx, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 Facsimile00000-0000 Telecopy: (000) -000-0000 Telephone: 000-000-0000 Attention: General Counsel If Xxxxxxxx X. Walk, Esq. With a copy to: Xxxxx Day Xxxxx Xxxxx 000 Xxxxxxxx Xxxxxx Xxxxxxxxx, Xxxx 00000 Telecopy: 000-000-0000 Telephone: 000-000-0000 Attention: Xxxxx X. Xxxxxx, Esq. In case the Company fails will fail to maintain such office or agency or fails will fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Warrant Agent Agreement to be given by the Company or by any registered holder the Holder(s) of any Warrant Certificate to the Warrant Agent shall will be sufficiently given when and if sent by certified deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & as follows: Xxxxx Fargo Bank, N.A. Corporate Trust Company 50 Xxxxxx Xxxx Xxx XxxxServices Sixth and Marquette MAC X0000-000 Xxxxxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.Telephone: (000) -000-0000 Facsimile: 000-000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Xxxx X. Xxxxxxxxx

Notices to Company and Warrant Agent. Any notice or demand authorized or required by this Warrant Agent Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on the Company shall will be sufficiently given or made when and if sent by certified deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsOglebay Norton Company North Point Tower 1001 Lakeside Avenue Cleveland, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileOhio 44114-1151 Telecopy: (000) -000-0000 AttentionXxxxxxxxx: General Counsel If 000-000-0000 Xxxention: Rochelle X. Xxxx, Xxx. With a coxx xx: Jones, Day, Reavix & Xxxxx North Point 901 Lakeside Avenue Clevexxxx, Ohix 00014 Telecopy: 216-570-0000 Xxxxxxxxx: 000-000-0000 Xxxxntion: David P. Pxxxxx, Xxx. In case the Company fails Xxxxxxx xxxl fail to maintain such office or xxxx xxxxxx xx agency or fails will fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Warrant Agent Agreement to be given by the Company or by any registered holder the Holder(s) of any Warrant Certificate to the Warrant Agent shall will be sufficiently given when and if sent by certified deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & as follows: Wells Fargo Bank, N.A. Corporate Trust Company 50 Xxxxxx Xxxx Xxx XxxxServices Sixth and Xxxxxette MAC N9303-120 Minneapolis, Xxx Xxxx 00000 Facsimile No.MN 55479 Telephone: (612-667-2344 Xxxxxxxxx: 000) -000-0000 AttentionXttention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Jane Y. Xxxxxxxxx

Notices to Company and Warrant Agent. Any notice ------------------------------------ or demand authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate Holder to or on the Company shall be sufficiently given delivered in person or made if sent by certified facsimile transmission, by courier guaranteeing overnight delivery or mailed by first-class mail or registered mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier service, addressed (i) to the Company (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO Communications, Inc. 10000 Houston Biotechnology Incorporated 0000 Xxxxxxxx Xxxxxx Xxxxx Xxxx XxxxxxXxx Xxxxxxxxx, Xxxxxxxx Xxxxx 00000 FacsimileTelecopy: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made Chief Financial Officer and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate (ii) to the Warrant Agent shall be sufficiently given if sent by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows (the “Warrant Agent Office”): American Stock Transfer & follows: Mellon Securities Trust Company 50 Xxxxxx Xxxx 000 Xxxxxxxx, 00xx Xxxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If Any notice pursuant to this Agreement by the Company or the Warrant Agent to any Holder shall receive any notice be in writing and shall be mailed by first-class mail, postage prepaid, or demand addressed otherwise delivered to the Company by the holder of a Warrant Certificate pursuant to the provisions of such Holder at its address on the Warrant CertificatesRegister. Notices delivered personally shall be effective at the time delivered by hand, notices sent by mail shall be effective four days after mailing, notices sent by facsimile transmission shall be effective when receipt is acknowledged and notices sent by courier guaranteeing next day delivery shall be effective on the Warrant Agent shall promptly forward next business day after timely delivery to such notice or demand to the Companycourier.

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any the registered holder of any Warrant Certificate to or on the Company shall be sufficiently given or made when and if sent delivered by certified facsimile transmission (provided confirmation of receipt is received immediately thereafter) or when received, if deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsThe Doe Run Resources Corporation 0000 Xxxx 000 Xxxxx Xxxxx 000 Xx. Xxxxx, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx XX 00000 FacsimileAttention: Chief Financial Officer Telecopy: (000) 000-0000 Attentionwith a copy to: General Counsel If Cadwalader, Xxxxxxxxxx & Xxxx 000 Xxxxxx Xxxx Xxx Xxxx, XX 00000 Attn: Xxxxxxx Xxxx, Esq. In case the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant AgentAgent designated for such purpose. Any notice pursuant to this Agreement to be given by the Company or by any the registered holder holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given when and if sent delivered by certified facsimile transmission (provided confirmation of receipt is received immediately thereafter) or deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & as follows: State Street Bank and Trust Company 50 Xxxxxx Xxxx Xxx XxxxCorporate Trust Administration 000 Xxxxxx, Xxx Xxxx 00xx Xxxxx Xxxxxxxx, XX 00000 Attention: Xxxxxxx Xxxxxxx Facsimile No.: (000) -000-0000 Attentionwith copies to: Warrant Agent for XO CommunicationsXxxxxxx & Xxxxxxx LLP Xxx Xxxxxxxx Xxx Xxxxxxxx, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant CertificatesXX 00000-0000 Attn: Xxxxxx Xxxxxxxx., the Warrant Agent shall promptly forward such notice or demand to the CompanyEsq. Facsimile No.: 000-000-0000 and Ropes & Xxxx Xxx Xxxxxxxxxxxxx Xxxxx Xxxxxx, XX 00000 Attn: Xxxxxx X. Xxxxxxxx, Esq. Facsimile No.: 000-000-0000

Notices to Company and Warrant Agent. Any notice or demand authorized or permitted by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate Holder to or on the Company to be effective shall be sufficiently in writing (including by facsimile), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two Business Days or less to the destination of such notice), or five days after being deposited in the mail, return receipt requestedfirst class and postage prepaid or, or by nationally recognized overnight courier servicein the case of facsimile notice, when received, addressed as follows (until another address or facsimile number is filed in writing by the Company with the Warrant Agent)): Dynegy Inc. 000 Xxxxxx Xxxxxx Suite 1400 Houston, or by facsimile transmission with receipt confirmed, or by personal delivery as followsTX 77002 Attention: XO Communications, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileGeneral Counsel Fax: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice or demand pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate Holder to the Warrant Agent shall be sufficiently given if sent in the same manner as notices or demands are to be given or made to or on the Company (except for Warrant Exercise Notices, which shall be delivered in accordance with Section 6 hereof) to the Warrant Agent at the office maintained by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed the Warrant Agent (the “Warrant Agent Office”) as follows (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (which other address shall become the “address of the Warrant Agent Office”Office for the purposes of this Agreement): American Stock Transfer & Trust Company 50 Computershare 000 Xxxxxxxxxx Xxxx. Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx Xxxxxx, 00000 Facsimile NoAttention: Corporate Actions Dept., 27th Floor Fax: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.0000

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Class B Warrant Certificate to or on the Company to be effective shall be sufficiently in writing (including by facsimile), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination of such notice), or five (5) days after being deposited in the mail, return receipt requestedfirst class and postage prepaid or, or by nationally recognized overnight courier servicein the case of facsimile notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsPrimus Telecommunications Group, Inc. 10000 Incorporated 0000 Xxxxx Xxxxxx Xxxxx Drive, Suite 900 XxXxxx, Virginia 22102 Attention: Xxxx Xxxxxx, Xxxxxxxx 00000 X. XxXxxxxxx Facsimile: (000) 000-0000 Attention: General Counsel If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder of any Class B Warrant Certificate to or on the Warrant Agent shall be sufficiently given if sent by certified mailin the same manner as notices, return receipt requested, requests or by nationally recognized overnight courier service, demands are to be given or made to or on the Company (as set forth above) addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: StockTrans, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Inc. 00 Xxxx Xxxxxxxxx Xxxxxx Xxxx Xxx XxxxXxxxxxx, Xxx Xxxx Xxxxxxxxxxxx 00000 Facsimile No.Attention: Xxxxxx X. Xxxxxxxx Facsimile: (000) 000-0000 Attention: The Warrant Agent for XO Communications, Inc. If the maintains a Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant CertificatesOffice at 00 Xxxx Xxxxxxxxx Xxxxxx, the Warrant Agent shall promptly forward such notice or demand to the CompanyXxxxxxx, Xxxxxxxxxxxx 00000.

Notices to Company and Warrant Agent. Any notice or demand authorized or permitted by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate Warrantholder to or on the Company to be effective shall be sufficiently in writing (including by facsimile or email, as applicable), and shall be deemed to have been duly given or made when delivered by hand, or when sent if sent by certified delivered to a recognized courier or deposited in the mail, return receipt requestedfirst class and postage prepaid or, in the case email or by nationally recognized overnight courier servicefacsimile notice, when received, addressed as follows (until another address, facimile number or email address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO Communications): Hertz Global Holdings, Inc. 10000 Xxxxxx Xxxxx 0000 Xxxxxxxx Xxxx XxxxxxEstero, Xxxxxxxx 00000 Facsimile: (000) 000-0000 Florida 33982 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereofM. Xxxxx Xxxxxxxxx Email: xxxx.xxxxxxxxx@xxxxx.xxx With a copy (which shall not constitute notice) to: White & Case LLP 000 Xxxxx Xxxxxxxx Xxxxxxxxx, presentation may be made Xxxxx 0000 Xxxxx, Xxxxxxx 00000 Attention: Xxxxxx X Xxxxxx Email: xxxxxxx@xxxxxxxxx.xxx and notices White & Case LLP 0000 Xxxxxx xx xxx Xxxxxxxx Xxx Xxxx, Xxx Xxxx 00000 Attention: Xxxxxxx Xxxxx and demands may be served at the principal office of the Warrant Agent. Xxxx Xxxxxx Email: xxxxxx@xxxxxxxxx.xxx xxxx.xxxxxx@xxxxxxxxx.xxx Any notice or demand pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate Warrantholder to the Warrant Agent shall be sufficiently given if sent in the same manner as notices or demands are to be given or made to or on the Company (as set forth above) to the Warrant Agent at the office maintained by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed the Warrant Agent (the “Warrant Agent Office”) as follows (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (which other address shall become the “address of the Warrant Agent Office”Office for the purposes of this Agreement): American Stock Transfer & Computershare Trust Company 50 Company, N.A., Computershare Inc. 000 Xxxxxx Xxxx Xxx XxxxXxxxxx Canton, Xxx Xxxx 00000 Facsimile No.MA 02021 Attention: Client Services Facsimile: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.0000

Notices to Company and Warrant Agent. Any notice or demand authorized by this Agreement to be given or made by the Warrant Agent or by any the registered holder of any Warrant Certificate to or on the Company shall be sufficiently given or made when and if sent by certified deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsATS Medical, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx3905 Annapolis Lane, Xxxxxxxx 00000 FacsimileSuite 105 Minneapolis, Minnesota 55400 Xxxxxxxxx: (000) 000-0000 AttentionXxxxxxxxx: General Counsel If the Company fails (000) 000-2244 Attentxxx: Xx. Xxxx R. Judd Titlx: Xxxxx Xxxxxcial Officer In xxxx xxx Xxxxxxx shall fail to maintain such office or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal corporate trust office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any the registered holder holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given when and if sent by certified deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxxas follows: Wells Fargo Bank, Xxx Xxxx 00000 Facsimile No.National Association Sixth and Marquettx, XXC N9303-120 Minneapolis, MN 55979 Telephone: (612) 000-0000 Xxxxxxxxx: (000) 000-0000 Attention9825 Attentxxx: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Xxxxxxxxx Trust Services Xxxxxxxxx: ATS Medical Warrants

Notices to Company and Warrant Agent. Any notice All notices, demands and other communications provided for or demand authorized by permitted under this Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on the Company shall be sufficiently given or made if sent in writing by hand- delivery, certified first-class mail, return receipt requested, next-day air courier or by nationally recognized overnight courier service, addressed facsimile as follows (until another address is filed in writing by the Company with the Warrant Agent)): Orbital Sciences Corporation 21839 Atlantic Boulevard Dulles, or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO Communications, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileVA 20166 Xxxxxxxxx: (000) 000-0000 Attention: General Counsel If Legal Department Xxxh a copy to: Hogan and Hartson, L.L.P. Columbia Square 055 13th Street N.W. Washington, DC 20004 Xxxxxxxxx: (000) 000-0000 Attention: James E. Showen Xx xase the Company fails shall fail to maintain such office mainxxxx xxxx xxxxxe or agency or fails shall fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to All notices, demands and other communications provided for or permitted under this Agreement to be given or made by the Company or by any registered holder the Holder(s) of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent made in writing by hand- delivery, certified first-class mail, return receipt requested, next-day air courier or by nationally recognized overnight courier service, addressed facsimile as follows (until another address is filed in writing by the Warrant Agent with the Company)): U.S. Bank, or by facsimile transmission with receipt confirmedN.A. 180 East 5th Street St. Paul, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.MN 55101 Xxxxxxxxx: (000) 000-0000 Attention: Warrant Agent for XO CommunicationsCorporate Trust Departxxxx All such notices and communications shall be deemed to have been duly given: when delivered by hand, Inc. If if personally delivered; five Business Days after being deposited in the Warrant Agent shall receive any notice or demand addressed mail, postage prepaid, if mailed; one Business Day after being timely delivered to the Company a next-day air courier; and when receipt is acknowledged by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificatesaddressee, the Warrant Agent shall promptly forward such notice or demand to the Companyif telecopied.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsVANGUARD NATURAL RESOURCES, Inc. 10000 Xxxxxx Xxxxx Xxxx INC. 5000 Xxx Xxxxxx, Xxxxxxxx 00000 FacsimileXxxxx 3000 Houston, TX 77057 Attn: (000) 000Secretary and Treasurer E-0000 Attentionmail: General Counsel rxxxxxx@xxxxxx.xxx PXXX XXXXXXXX LLP 600 Xxxxxx Xx. 58th Floor Houston, TX 77002 Attn: Dxxxxxx X. Xxxxxx E-mail: dxxxxxxxxx@xxxxxxxxxxxx.xxx If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Company, LLC 6000 00xx Xxxxxx Xxxx Xxx XxxxXxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.: (000) 000-0000 Attention: Relationship Management for Vanguard Natural Resources, Inc. Email: axxxx0@xxxxxxxxxxxx.xxx The Warrant Agent for XO Communications, Inc. If maintains the Warrant Agent shall receive any notice or demand addressed to Agent’s Principal Office at the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companyabove address.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made when delivered by hand, or one Business Day if sent by certified overnight courier service (with next day delivery specified), or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsTidewater Inc. 000 Xxxxxxx Xx. Xxxxx 0000 Xxx Xxxxxxx, Inc. 10000 Xxxxxx Xxxxxxxxx 00000 Fax: 0.000.000.0000 Attn: Xxxxx Xxxx XxxxxxX. Xxxxxxxxx, Xxxxxxxx 00000 Facsimile: (000) 000-0000 Attention: Executive Vice President, General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Secretary Email: xxxxxxxxxx@xxx.xxx Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmedas follows: Computershare Trust Company, or by personal delivery as follows (the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 N.A. Computershare Inc. 000 Xxxxxx Xxxx Xxx XxxxXxxxxx Canton, Xxx Xxxx 00000 Facsimile No.MA 02021 Fax: (000) 000-0000 0.000.000.0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Client Services

Notices to Company and Warrant Agent. Any notice or demand authorized or required by this Warrant Agent Agreement to be given or made by the Warrant Agent or by any registered holder the Holder of any Warrant Certificate to or on the Company shall will be sufficiently given or made when and if sent by certified deposited in the mail, return receipt requestedfirst class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO CommunicationsOglebay Norton Company North Point Tower 1001 Lakeside Avenue Cleveland, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileOhio 44114-1151 Telexxxx: (000) -000-0000 Xxxxxxxxx: 000-000-0000 Attention: General Counsel If the Company fails Rocxxxxx X. Xxxk, Esq. Witx x xxxx xx: Jones Day Xxxth Point 901 Lakeside Avenue Cxxxxxand, Ohio 44110 Xxxxxxxx: 000-000-0000 Xxxxxxxxx: 000-000-0000 Attention: Davix X. Xxxxxx, Esq. In caxx xxx Xxxxxny will fail to maintain such office maintxxx xxxx xxxxxx or agency or fails will fail to give such notice of the location or of any change in the location thereof, presentation presentations may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Warrant Agent Agreement to be given by the Company or by any registered holder the Holder(s) of any Warrant Certificate to the Warrant Agent shall will be sufficiently given when and if sent by certified deposited in the mail, return receipt requestedfirst-class or registered, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows () to the “Warrant Agent Office”): American Stock Transfer & as follows: Wells Fargo Bank, N.A. Corporate Trust Company 50 Xxxxxx Xxxx Xxx XxxxServices Sixtx xxx Marquette MAC N9303-120 Minneapolis, Xxx Xxxx 00000 Facsimile No.MN 55479 Telephone: (612-667-0000 Xxxxxxxxx: 000) -000-0000 Attention: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.Jaxx X. Xxxxxxger

Notices to Company and Warrant Agent. Any notice or demand authorized or permitted by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate Warrantholder to or on the Company to be effective shall be sufficiently in writing (including by facsimile or email, as applicable), and shall be deemed to have been duly given or made when delivered by hand, or when sent if sent by certified delivered to a recognized courier or deposited in the mail, return receipt requestedfirst class and postage prepaid or, in the case email or by nationally recognized overnight courier servicefacsimile notice, when received, addressed as follows (until another address, facsimile number or email address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO Communications): Core Scientific, Inc. 10000 000 Xxxxxx Xxxxx Xxxx XxxxxxSuite 21-2105 Dover, Xxxxxxxx 00000 Facsimile: (000) 000-0000 DE 19904 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereofLegal Email: xxxxx@xxxxxxxxxxxxxx.xxx with a copy to: Xxxx, presentation may be made and notices and demands may be served at the principal office of the Warrant AgentGotshal & Xxxxxx LLP 000 0xx Xxxxxx New York, NY 10153 Attention: Xxxxxxx X. Xxxxxxx, Esq. Email: xxxxxxx.xxxxxxx@xxxx.xxx Any notice or demand pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate Warrantholder to the Warrant Agent shall be sufficiently given if sent in the same manner as notices or demands are to be given or made to or on the Company (as set forth above), except email and facsimile, to the Warrant Agent at the office maintained by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed the Warrant Agent (the “Warrant Agent Office”) as follows (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (which other address shall become the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If address of the Warrant Agent shall receive any notice or demand addressed to Office for the Company by the holder purposes of a Warrant Certificate pursuant to the provisions of the Warrant Certificatesthis Agreement): Computershare Trust Company, the Warrant Agent shall promptly forward such notice or demand to the Company.N.A., Computershare Inc. 000 Xxxxxx Xxxxxx Canton, MA 02021 Attention: Client Services

Notices to Company and Warrant Agent. Any notice or demand authorized or permitted by this Agreement to be given or made by the Warrant Agent or by any registered holder of any Warrant Certificate Holder to or on the Company to be effective shall be sufficiently in writing (including by electronic transmission including portable document format (pdf.)), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two (2) Business Days after being delivered to a recognized courier (whose stated terms of delivery are two (2) Business Days or less to the destination of such notice), or five (5) days after being deposited in the mail, return receipt requestedfirst class and postage prepaid or, or in the case of notice by nationally recognized overnight courier serviceelectronic transmission, when received, addressed as follows (until another address is filed in writing by the Company with the Warrant Agent)): Mallinckrodt plc 000 XxXxxxxxx Xxxxxxxxx Hazelwood, or by facsimile transmission with receipt confirmed, or by personal delivery as follows: XO Communications, Inc. 10000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 Facsimile: (000) 000-0000 MO 63042 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereofXxxxxx X. Xxxxxxxx Email: xxxxxxxx.xxxxxxxxx@xxx.xxx with copies (which shall not constitute notice) to: Wachtell, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Lipton, Xxxxx & Xxxx LLP 00 Xxxx 00xx Xxxxxx Xxx Xxxx, XX 00000 Attention: Xxxxxx Xxxxxxxx Email: XXxxxxxxx@xxxx.xxx Xxxxxx & Xxxxxxx LLP 0000 Xxxxxx xx xxx Xxxxxxxx Xxx Xxxx, XX 00000 Attention: Xxxxxxxx X. Xxxxx Email: Xxxxxxxx.Xxxxx@xx.xxx Any notice or demand pursuant to this Agreement to be given by the Company or by any registered holder of any Warrant Certificate Holder to the Warrant Agent shall be sufficiently given if sent in the same manner as notices or demands are to be given or made to or on the Company (except for Warrant Exercise Notices, which shall be delivered in accordance with Section 6 hereof) to the Warrant Agent at the office maintained by certified mail, return receipt requested, or by nationally recognized overnight courier service, addressed the Warrant Agent (the “Warrant Agent Office”) as follows (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (which other address shall become the “Warrant Agent Office”): American Stock Transfer & Trust Company 50 Xxxxxx Xxxx Xxx Xxxx, Xxx Xxxx 00000 Facsimile No.: (000) 000-0000 Attention: Warrant Agent for XO Communications, Inc. If address of the Warrant Agent shall receive any notice or demand addressed to Office for the Company by the holder purposes of a Warrant Certificate pursuant to the provisions of the Warrant Certificatesthis Agreement): Computershare Inc. Computershare Trust Company, the Warrant Agent shall promptly forward such notice or demand to the Company.N.A. 000 Xxxxxx Xxxxxx Canton, MA 02021 Attention: Client Services

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made if sent when delivered by certified hand, or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO Communications, Inc. 10000 AMPLIFY ENERGY CORP. 000 Xxxxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx Xxxxx 0000 Xxxxxxx, XX 00000 Facsimile: (000) 000-0000 Attention: General Counsel E-mail: xxxxx_xxxxxxx@xxxxxxxxxxxxx.xxx If the Company fails shall fail to maintain such office or agency or fails shall fail to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requestedpostage prepaid, or by nationally recognized overnight courier servicefacsimile or email notice, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Xxxxxx Company, LLC 00 Xxxx Xxxxxx, 00xx Xxxxx Xxx Xxxx, Xxx Xxxx XX 00000 Facsimile No.: (000) 000-0000 Attention: Legal Department Email: xxxxxxxxxXXX@xxxxxxx.xxx The Warrant Agent for XO Communications, Inc. If maintains the Warrant Agent shall receive any notice or demand addressed to Agent’s Principal Office at the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Companyabove address.

Notices to Company and Warrant Agent. Any notice All notices, requests or demand demands authorized by this Agreement to be given or made by the Warrant Agent or by any registered holder Holder of any Warrant Certificate to or on the Company or the Warrant Agent to be effective shall be sufficiently in writing (including by telecopy), and shall be deemed to have been duly given or made when delivered by hand, or one Business Day if sent by certified overnight courier service (with next day delivery specified), or two Business Days after being delivered to a recognized courier (whose stated terms of delivery are two business days or less to the destination such notice), or five Business Days after being deposited in the mail, return receipt requestedor, in the case of facsimile or by nationally recognized overnight courier serviceemail notice, when received, addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission with receipt confirmed, or by personal delivery ) as follows: XO CommunicationsTidewater Inc. 000 Xxxx Xxx Xxxxxxx Parkway North, Inc. 10000 Suite 400 Houston, TX 77024 Attn: Xxxxxx X. Xxxxxx Xxx Xxxxxx Xxxxxxxxxxx Xxxx Xxxxx Xxxx Xxxxxx, Xxxxxxxx 00000 FacsimileEmail: (000) 000-0000 Attention: General Counsel If the Company fails to maintain such office or agency or fails to give such notice of any change in the location thereof, presentation may be made and notices and demands may be served at the principal office of the Warrant Agent. [Personal Information Redacted] Any notice pursuant to this Agreement to be given by the Company or by any registered holder Holder of any Warrant Certificate to the Warrant Agent shall be sufficiently given if sent by certified first-class mail, return receipt requested, or by nationally recognized overnight courier servicepostage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company), or by facsimile transmission with receipt confirmed, or by personal delivery as follows (the “Warrant Agent Office”): follows: American Stock Transfer & Trust Company 50 Company, LLC 0000 00xx Xxxxxx Xxxx Xxx XxxxXxxxxxxx, Xxx Xxxx XX 00000 Facsimile No.Attn: (000) 000-0000 AttentionReorg Department – Warrants Email: Warrant Agent for XO Communications, Inc. If the Warrant Agent shall receive any notice or demand addressed to the Company by the holder of a Warrant Certificate pursuant to the provisions of the Warrant Certificates, the Warrant Agent shall promptly forward such notice or demand to the Company.[Personal Information Redacted]