Common use of Unexercised Warrant Shares Clause in Contracts

Unexercised Warrant Shares. After giving effect to the Vesting Event referenced in Paragraph A above, the aggregate number of Warrant Shares issuable upon exercise of the Warrant that have vested but remain unexercised under the Warrant is: PLUG POWER INC. By: Name: Title: Annex B [Form of Notice of Exercise] Date: TO: Plug Power Inc. RE: Election to Purchase Common Stock The undersigned, pursuant to the provisions set forth in the attached Warrant, hereby agrees to subscribe for and purchase the number of shares of Common Stock set forth below covered by such Warrant. The undersigned, in accordance with Section 3 of the Warrant, hereby agrees to pay the aggregate Exercise Price for such shares of Common Stock. A new warrant evidencing the remaining shares of Common Stock covered by such Warrant, but not yet subscribed for and purchased, if any, should be issued in the name of the Warrantholder. Number of shares of Common Stock with respect to which the Warrant is being exercised (including shares to be withheld as payment of the Exercise Price pursuant to Section 3(i) of the Warrant, if any): Method of Payment of Exercise Price (note if cashless exercise pursuant to Section 3(ii)(B)(ii) of the Warrant or cash exercise pursuant to Section 3(ii)(B)(i) of the Warrant): Aggregate Exercise Price: Holder: By: Name: Title:

Unexercised Warrant Shares. After giving effect to the Vesting Event referenced in Paragraph A above, the aggregate number of Warrant Shares issuable upon exercise of the Warrant that have vested but remain unexercised under the Warrant is: PLUG POWER Those portions of this Agreement marked with an [*] have been omitted pursuant to a request for confidential treatment and have been filed separately with the SEC. ____________________________. AIR TRANSPORT SERVICES GROUP, INC. By: Name: Title: Those portions of this Agreement marked with an [*] have been omitted pursuant to a request for confidential treatment and have been filed separately with the SEC. Annex B [Form of Notice of Exercise] Date: TO: Plug Power Air Transport Services Group, Inc. RE: Election to Purchase Common Stock The undersigned, pursuant to the provisions set forth in the attached Warrant, hereby agrees to subscribe for and purchase the number of shares of the Common Stock set forth below covered by such Warrant. The undersigned, in accordance with Section 3 of the Warrant, hereby agrees to pay the aggregate Exercise Price for such shares of Common Stock. A new warrant evidencing the remaining shares of Common Stock covered by such Warrant, but not yet subscribed for and purchased, if any, should be issued in the name of the Warrantholder. Number of shares of Common Stock with respect to which the Warrant is being exercised (including shares to be withheld as payment of the Exercise Price pursuant to Section 3(i3(ii)(B)(ii) of the Warrant, if any): ______________________________________ Method of Payment of Exercise Price (note if cashless exercise pursuant to Section 3(ii)(B)(ii) of the Warrant or cash exercise pursuant to Section 3(ii)(B)(i) of the Warrant): ___________________________________ Aggregate Exercise Price: _______________________________ Holder: By: Name: Title:

Unexercised Warrant Shares. After giving effect to the Vesting Event referenced in Paragraph A above, the aggregate number of Warrant Shares issuable upon exercise of the Warrant that have vested but remain unexercised under the Warrant is: PLUG POWER ____________________________. LA_LAN01:342544.5 AIR TRANSPORT SERVICES GROUP, INC. By: Name: Title: Annex B LA_LAN01:342544.5 [Form of Notice of Exercise] Date: TO: Plug Power Air Transport Services Group, Inc. RE: Election to Purchase Common Stock The undersigned, pursuant to the provisions set forth in the attached Warrant, hereby agrees to subscribe for and purchase the number of shares of the Common Stock set forth below covered by such Warrant. The undersigned, in accordance with Section 3 of the Warrant, hereby agrees to pay the aggregate Exercise Price for such shares of Common Stock. A new warrant evidencing the remaining shares of Common Stock covered by such suc h Warrant, but not yet subscribed for and purchased, if any, should be issued in the name of the Warrantholder. Number of shares of Common Stock with respect to which the Warrant is being exercised (including shares to be withheld as payment of the Exercise Price pursuant to Section 3(i3(ii)(B)(ii) of the Warrant, if any): ______________________________________ Method of Payment of Exercise Price (note if cashless exercise pursuant to Section 3(ii)(B)(ii) of the Warrant or cash exercise pursuant to Section 3(ii)(B)(i) of the Warrant): ___________________________________ Aggregate Exercise Price: _______________________________ Holder: By: Name: Title: