REGISTRATION RIGHTS AGREEMENT

Exhibit 4.2

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is made as of November 6, 2009, among STR Holdings, Inc., a corporation organized under the laws of the State of Delaware (the “Company”), and the Persons named on the signature pages hereto (including any additional signatories to this Agreement after the date hereof, the “Stockholders”).

W I T N E S S E T H:

WHEREAS, the parties hereto desire to enter into this Agreement to establish certain arrangements with respect to the Company Securities owned by the Stockholders, and other related matters; and

NOW, THEREFORE, in consideration of the premises and of the mutual covenants and obligations hereinafter set forth, the parties hereto hereby agree as follows:

ARTICLE I

Section 1.01. Demand Registration.

(a) If the Company shall receive a written request from the DLJMB Stockholders (such requesting person, the “Requesting Stockholder”) that the Company effect the registration under the Securities Act of all or any portion of such Requesting Stockholder’s Registrable Securities, and specifying the intended method of disposition thereof, then the Company shall promptly give notice of such requested registration (each such request shall be referred to herein as a “Demand Registration”) at least fifteen (15) Business Days prior to the anticipated filing date of the registration statement relating to such Demand Registration to the other Stockholders and thereupon shall use its best efforts to effect, as expeditiously as possible, the registration under the Securities Act of:

(i) all Registrable Securities for which the Requesting Stockholders have requested registration under this Section 1.01, and

(ii) subject to the restrictions set forth in Sections 1.01(e) and 1.02, all other Registrable Securities of the same class as those requested to be registered by the Requesting Stockholders that any Stockholders with rights to request registration under Section 1.02 (all such Stockholders, together with the Requesting Stockholders, the “Registering Stockholders”) have requested the Company to register by request received by the Company within ten (10) Business Days after such Stockholders receive the Company’s notice of the Demand Registration, all to the extent necessary to permit the disposition (in accordance with the intended methods thereof as aforesaid) of the Registrable Securities so to be registered; provided that, subject to Section 1.01(d) hereof, the Company shall not be obligated to effect (x) more than six Demand Registrations, (y)

more than one Demand Registration during any four-month period, or (z) any Demand Registration unless the aggregate gross proceeds expected to be received from the sale of the Registrable Securities requested to be included by all Registering Stockholders in such Demand Registration are at least $20 million in any Demand Registration other than the Initial Public Offering.

(b) Promptly after the expiration of the ten (10) Business Day period referred to in Section 1.01(a)(ii) hereof, the Company will notify all Registering Stockholders of the identities of the other Registering Stockholders and the number of shares of Registrable Securities requested to be included therein. At any time prior to the effective date of the registration statement relating to such registration, the Requesting Stockholders may revoke such request, without liability to any of the other Registering Stockholders, by providing a notice to the Company revoking such request.

(c) The Company shall be liable for and pay all Registration Expenses in connection with each Demand Registration, regardless of whether such Demand Registration is effected.

(d) A Demand Registration shall not be deemed to have occurred:

(i) unless the registration statement relating thereto (A) has become effective under the Securities Act and (B) has remained effective for a period of at least 120 days (or such shorter period in which all Registrable Securities of the Registering Stockholders included in such registration have actually been sold thereunder), provided that such registration statement shall not be considered a Demand Registration if, after such registration statement becomes effective, (1) such registration statement is interfered with by any stop order, injunction or other order or requirement of the SEC or other governmental agency or court and (2) less than 75% of the Registrable Securities included in such registration statement have been sold thereunder; or

(ii) if the Maximum Offering Size (as defined below) is reduced in accordance with Section 1.01(e) such that less than 50% of the Registrable Securities of the Requesting Stockholders sought to be included in such registration are included.

(e) If a Demand Registration involves a Public Offering and the managing underwriter advises the Company and the Requesting Stockholders that, in its view, the number of Company Securities that the Registering Stockholders and the Company propose to include in such registration exceeds the largest number of shares that can be sold without having an adverse effect on such offering, including the price at which such shares can be sold (the “Maximum Offering Size”), the Company shall include in such registration, in the priority listed below, up to the Maximum Offering Size:

(i) first, all Registrable Securities requested to be registered by the Registering Stockholders (allocated, if necessary for the offering not to exceed the

Maximum Offering Size, pro rata among such Stockholders on the basis of the relative number of Registrable Securities so requested to be included in such registration by each); and

(ii) second, all Registrable Securities proposed to be registered by the Company.

Section 1.02. Piggyback Registration.

(a) If the Company proposes to register any Company Securities under the Securities Act (whether for itself or in connection with a sale of securities by a Stockholder, but other than a registration on Form S-8 or S-4, or any successor or similar forms, relating to common stock issuable upon exercise of employee stock options or in connection with any employee benefit or similar plan of the Company or in connection with a direct or indirect acquisition by the Company of another Person), the Company shall each such time give prompt written notice at least ten (10) Business Days prior to the anticipated filing date of the registration statement relating to such registration to each Stockholder (each a Piggyback Stockholder”), which notice shall set forth such Piggyback Stockholder’s rights under this Section 1.02 and shall offer such Piggyback Stockholder the opportunity to include in such registration statement the number of Registrable Securities of the same class or series as those proposed to be registered as each such Piggyback Stockholder may request (a “Piggyback Registration”), subject to the provisions of Section 1.02(b) and the Public Offering Limitations. Upon the request of any such Piggyback Stockholder made within five (5) Business Days after the receipt of notice from the Company (which request shall specify the number of Registrable Securities intended to be registered by such Piggyback Stockholder), the Company shall use its best efforts to effect the registration under the Securities Act of all Registrable Securities that the Company has been so requested to register by all such Piggyback Stockholders, to the extent requisite to permit the disposition of the Registrable Securities so to be registered, provided that (i) if such registration involves a Public Offering, all such Piggyback Stockholders requesting to be included in the Company’s registration must sell their Registrable Securities to the underwriters selected as provided in Section 1.04(f)(i) on the same terms and conditions as apply to the Company or any other selling Piggyback Stockholders, and (ii) if, at any time after giving notice of its intention to register any Company Securities pursuant to this Section 1.02(a) and prior to the effective date of the registration statement filed in connection with such registration, the Company shall determine for any reason not to register such securities, the Company shall give notice to all such Piggyback Stockholders and, thereupon, shall be relieved of its obligation to register any Registrable Securities in connection with such registration. No registration effected under this Section 1.02 shall relieve the Company of its obligations to effect a Demand Registration to the extent required by Section 1.01. The Company shall be liable for and pay all Registration Expenses in connection with each Piggyback Registration.

(b) If a Piggyback Registration involves a Public Offering (other than any Demand Registration, in which case the provisions with respect to priority of inclusion in such offering set forth in Section 1.01(e) shall apply) and the managing

underwriter advises the Company that, in its view, the number of Company Securities that the Company and such selling Piggyback Stockholders propose to include in such registration exceeds the Maximum Offering Size, the Company shall include in such registration, in the following priority, up to the Maximum Offering Size:

(i) with respect to a Public Offering by the Company for its own account:

(1) first, such number of Registrable Securities proposed to be registered for the account of the Company, if any, as would not cause the offering to exceed the Maximum Offering Size, and

(2) second, all Registrable Securities requested to be included in such registration by any Registering Stockholders (allocated, if necessary for the offering not to exceed the Maximum Offering Size, pro rata among such Stockholders based on their relative number of Registrable Securities requested to be included in the Piggyback Registration, unless the managing underwriter reasonably determines otherwise (which, for the avoidance of doubt, could, in the reasonable determination of the managing underwriter, include the exclusion of all Registrable Securities of the Management Stockholders), in which case the allocation of such Registrable Securities shall be in the manner reasonably determined by the managing underwriter).

(ii) With respect to a Public Offering by the Company for the account of selling stockholders:

(1) first, all Registrable Securities requested to be included in such registration by any Registering Stockholders (allocated, if necessary for the offering not to exceed the Maximum Offering Size, pro rata among such Stockholders based on their relative number of Registrable Securities requested to be included in the Piggyback Registration, unless the managing underwriter reasonably determines otherwise (which, for the avoidance of doubt, could, in the reasonable determination of the managing underwriter, include the exclusion of all Registrable Securities of the Management Members), in which case the allocation of such Registrable Securities shall be in the manner reasonably determined by the managing underwriter), and

(2) second, all Registrable Securities proposed to be registered for the account of the Company.

Section 1.03. Lock-Up Agreements. (a) In connection with each underwritten Public Offering, if requested by the managing underwriter, the Company and the Stockholders agree (and the Company agrees, in connection with any underwritten Public Offering, to use its commercially reasonable efforts to cause its Affiliates to agree) not to effect any public sale or private offer or distribution, including any sale pursuant to Rule 144 of any Registrable Securities during the 10 days prior to the consummation of such Public Offering and during such time period after the consummation of such Public Offering, not to exceed 90 days (180 days in the case of the Initial Public Offering); provided, however, that no Other Stockholder will be required to agree to any restrictions that are more restrictive than those applicable to any DLJMB Stockholder; provided further, however, that the restrictions described in this Section 1.03 shall not apply to (i) any Company Securities or other securities of the Company acquired in the Initial Public Offering, in any Public Offering or in any open market transaction following the Initial Public Offering and (ii) any Other Stockholder that ceases to have Piggyback Registration Rights.

(b) Other than pursuant to a Demand Registration or Piggyback Registration, following the expiration of any underwriter lock-up period applicable to the Stockholders for the Initial Public Offering:

(i) only fifty percent (50%) of the Company Securities held by each Stockholder shall become eligible for sale by such Stockholder on the date that is 180 days following the expiration of such underwriter lock-up period; and

(ii) the remaining fifty percent (50%) of such Stockholder’s Company Securities shall become eligible for sale by such Stockholder on the date that is 271 days following the expiration of such underwriter lock-up period

Section 1.04. Registration Procedures. Whenever any Stockholders request that any Registrable Securities be registered pursuant to Section 1.01 or 1.02 hereof, subject to the provisions of such Sections, the Company shall use its best efforts to effect the registration and the sale of such Registrable Securities in accordance with the intended method of disposition thereof as quickly as practicable, and, in connection with any such request:

(a) The Company shall as expeditiously as possible prepare and file with the SEC a registration statement on any form for which the Company then qualifies or that counsel for the Company shall deem appropriate and which form shall be available for the sale of the Registrable Securities to be registered thereunder in accordance with the intended method of distribution thereof, and use its best efforts to cause such filed registration statement to become and remain effective for a period of not less than 180 days, or in the case of a shelf registration statement, one (1) year (or such shorter period in which all of the Registrable Securities of the Registering Stockholders included in such registration statement shall have actually been sold thereunder).

(b) Prior to filing a registration statement or prospectus or any amendment or supplement thereto, the Company shall, if requested, furnish to each participating Stockholder and each underwriter, if any, of the Registrable Securities covered by such registration statement copies of such registration statement as proposed to be filed, and thereafter the Company shall furnish to such Stockholder and underwriter, if any, such number of copies of such registration statement, each amendment and supplement thereto (in each case including all exhibits thereto and documents incorporated by reference therein), the prospectus included in such registration statement (including each preliminary prospectus and any summary prospectus) and any other prospectus filed under Rule 424 under the Securities Act and such other documents as such Stockholder or underwriter may reasonably request in order to facilitate the disposition of the Registrable Securities owned by such Stockholder.

(c) After the filing of the registration statement, the Company shall (i) cause the related prospectus to be supplemented by any required prospectus supplement, and, as so supplemented, to be filed pursuant to Rule 424 under the Securities Act, (ii) comply with the provisions of the Securities Act with respect to the disposition of all Registrable Securities covered by such registration statement during the applicable period in accordance with the intended methods of disposition by the Registering Stockholders thereof set forth in such registration statement or supplement to such prospectus and (iii) promptly notify each Registering Stockholder holding Registrable Securities covered by such registration statement of any stop order issued or threatened by the SEC or any state securities commission and take all reasonable actions required to prevent the entry of such stop order or to remove it if entered.

(d) The Company shall use its best efforts to (i) register or qualify the Registrable Securities covered by such registration statement under such other securities or “blue sky” laws of such jurisdictions in the United States as any Registering Stockholder holding such Registrable Securities reasonably (in light of such Stockholder’s intended plan of distribution) requests and (ii) cause such Registrable Securities to be registered with or approved by such other governmental agencies or authorities as may be necessary by virtue of the business and operations of the Company and do any and all other acts and things that may be reasonably necessary or advisable to enable such Stockholder to consummate the disposition of the Registrable Securities owned by such Stockholder; provided that the Company shall not be required to (A) qualify generally to do business in any jurisdiction where it would not otherwise be required to qualify but for this Section 1.04(d), (B) subject itself to taxation in any such jurisdiction or (C) consent to general service of process in any such jurisdiction.

(e) The Company shall immediately notify each Registering Stockholder holding such Registrable Securities covered by such registration statement, at any time when a prospectus relating thereto is required to be delivered under the Securities Act, of the occurrence of an event requiring the preparation of a supplement or amendment to such prospectus so that, as thereafter delivered to the purchasers of such Registrable Securities, such prospectus will not contain an untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading and promptly prepare and make available to each such Stockholder and file with the SEC any such supplement or amendment.

(f) (i) The DLJMB Stockholders shall have the right, in their sole discretion, to select the underwriter or underwriters in connection with any Public Offering resulting from a Demand Registration, which underwriter or underwriters may include any Affiliate of any DLJMB Stockholder, and (ii) the Company shall select an underwriter or underwriters in connection with any other Public Offering. In connection with any Public Offering, the Company shall enter into customary agreements (including an underwriting agreement in customary form) and take all such other actions as are reasonably required in order to expedite or facilitate the disposition of such Registrable Securities in any such Public Offering, including the engagement of a “qualified independent underwriter” in connection with the qualification of the underwriting arrangements with FINRA.

(g) Upon execution of confidentiality agreements in form and substance reasonably satisfactory to the Company, the Company shall make available for inspection by any Registering Stockholder and any underwriter participating in any disposition pursuant to a registration statement being filed by the Company pursuant to this Section 1.04 and any attorney, accountant or other professional retained by any such Stockholder or underwriter (collectively, the “Inspectors”), all financial and other records, pertinent corporate documents and properties of the Company (collectively, the “Records”) as shall be reasonably necessary or desirable to enable them to exercise their due diligence responsibility, and cause the Company’s officers, directors and employees to supply all information reasonably requested by any Inspectors in connection with such registration statement. Records that the Company determines, in good faith, to be confidential and that it notifies the Inspectors are confidential shall not be disclosed by the Inspectors unless (i) the disclosure of such Records is necessary to avoid or correct a misstatement or omission in such registration statement or (ii) the release of such Records is ordered pursuant to a subpoena or other order from a court of competent jurisdiction. Each Registering Stockholder agrees that information obtained by it as a result of such inspections shall be deemed confidential and shall not be used by it or its Affiliates as the basis for any market transactions in the Company Securities unless and until such information is made generally available to the public. Each Registering Stockholder further agrees that, upon learning that disclosure of such Records is sought in a court of competent jurisdiction, it shall give notice to the Company and allow the Company, at its expense, to undertake appropriate action to prevent disclosure of the Records deemed confidential.

(h) The Company shall furnish to each Registering Stockholder and to each such underwriter, if any, a signed counterpart, addressed to such Stockholder or underwriter, of (i) an opinion or opinions of counsel to the Company and (ii) a comfort letter or comfort letters from the Company’s independent public accountants, each in customary form and covering such matters of the kind customarily covered by opinions or comfort letters, as the case may be, as a majority of such Stockholders or the managing underwriter therefor reasonably requests.

(i) The Company shall otherwise use its best efforts to comply with all applicable rules and regulations of the SEC, and make available to its security holders, as soon as reasonably practicable, an earning statement or such other document that shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder.

(j) The Company may require each such Registering Stockholder promptly to furnish in writing to the Company such information regarding the distribution of the Registrable Securities as the Company may from time to time request and such other information as may be legally required in connection with such registration.

(k) Each such Registering Stockholder agrees that, upon receipt of any written notice from the Company of the occurrence of any event requiring the preparation of a supplement or amendment of a prospectus relating to the Registrable Securities covered by a registration statement that is required to be delivered under the Securities Act so that, as thereafter delivered to the purchasers of such Registrable Securities, such prospectus will not contain an untrue statement of a material fact or omit to state any material fact required to be stated therein or to make the statements therein not misleading, such Stockholder shall forthwith discontinue disposition of Registrable Securities pursuant to the registration statement covering such Registrable Securities until such Stockholder’s receipt of the copies of a supplemented or amended prospectus, and, if so directed by the Company, such Stockholder shall deliver to the Company all copies, other than any permanent file copies then in such Stockholder’s possession, of the most recent prospectus covering such Registrable Securities at the time of receipt of such notice. If the Company shall give such notice, the Company shall extend the period during which such registration statement shall be maintained effective (including the period referred to in Section 1.04(a) hereof) by the number of days during the period from and including the date of the giving of notice pursuant to Section 1.04(e) hereof to the date when the Company shall make available to such Stockholder a prospectus supplemented or amended to conform with the requirements of Section 1.04(e) hereof.

(l) The Company shall use its reasonable efforts to list all Registrable Securities covered by such registration statement on any securities exchange or quotation system on which any of the Registrable Securities are then listed or traded and to maintain such listing so long as any such Registrable Securities remain outstanding.

(m) The Company shall have appropriate officers of the Company (i) prepare and make presentations at any “road shows” and before analysts and rating agencies, as the case may be, (ii) take other actions to obtain ratings for any Registrable Securities and (iii) otherwise use their reasonable efforts to cooperate as requested by the underwriters in the offering, marketing or selling of the Registrable Securities.

Section 1.05. Indemnification by the Company. The Company agrees to indemnify and hold harmless each Registering Stockholder holding Registrable Securities covered by a registration statement, its officers, directors, employees, managers, members, partners and agents, and each Person, if any, who controls any such Persons within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages, liabilities and expenses (including reasonable expenses of investigation and reasonable attorneys’ fees and expenses) (“Damages”) caused by or relating to any untrue statement or alleged untrue statement of a material fact contained in any registration statement, prospectus or free writing

prospectus relating to the Registrable Securities (as amended or supplemented if the Company shall have furnished any amendments or supplements thereto) or any preliminary prospectus, or caused by or relating to any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such Damages are caused by or related to any such untrue statement or omission or alleged untrue statement or omission so made based upon information furnished in writing to the Company by such Stockholder or on such Stockholder’s behalf expressly for use therein, provided that, with respect to any untrue statement or omission or alleged untrue statement or omission made in any preliminary prospectus, or in any prospectus, as the case may be, the indemnity agreement contained in this paragraph shall not apply to the extent that any Damages result from the fact that a current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) was not sent or given to the Person asserting any such Damages at or prior to the written confirmation of the sale of the Registrable Securities concerned to such Person if it is determined that the Company has provided such prospectus to such Stockholder and it was the responsibility of such Stockholder to provide such Person with a current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) and such current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) would have cured the defect giving rise to such Damages. The Company also agrees to indemnify any underwriters of the Registrable Securities, their officers and directors and each Person who controls such underwriters within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act on substantially the same basis as that of the indemnification of the Stockholders provided in this Section 1.05.

Section 1.06. Indemnification by the Participating Stockholders. Each Registering Stockholder holding Registrable Securities included in any registration statement agrees, severally but not jointly, to indemnify and hold harmless the Company, its officers, directors and agents and each Person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to such Stockholder, but only (i) with respect to information furnished in writing to the Company by such Stockholder or on such Stockholder’s behalf expressly for use in any registration statement or prospectus relating to the Registrable Securities, or any amendment or supplement thereto, or any preliminary prospectus or (ii) to the extent that any Damages result from the fact that a current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) was not sent or given to the Person asserting any such Damages at or prior to the written confirmation of the sale of the Registrable Securities concerned to such Person if it is determined that it was the responsibility of such Stockholder to provide such Person with a current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) and such current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) was available to such Stockholder and would have cured the defect giving rise to such Damages. Each such Stockholder also agrees to indemnify and hold harmless underwriters of the Registrable Securities, their officers and directors and each Person

who controls such underwriters within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act on substantially the same basis as that of the indemnification of the Company provided in this Section 1.06. As a condition to including Registrable Securities in any registration statement filed in accordance with Article 5 hereof, the Company may require that it shall have received an undertaking reasonably satisfactory to it from any underwriter to indemnify and hold it harmless to the extent customarily provided by underwriters with respect to similar securities. No Registering Stockholder shall be liable under this Section 1.06 for any Damages in excess of the net proceeds realized by such Stockholder in the sale of Registrable Securities of such Stockholder to which such Damages relate.

Section 1.07. Conduct of Indemnification Proceedings. If any proceeding (including any governmental investigation) shall be instituted involving any Person in respect of which indemnity may be sought pursuant to this Agreement, such Person (an “Indemnified Party”) shall promptly notify the Person against whom such indemnity may be sought (the “Indemnifying Party”) in writing and the Indemnifying Party shall assume the defense thereof, including the employment of counsel reasonably satisfactory to such Indemnified Party, and shall assume the payment of all fees and expenses, provided that the failure of any Indemnified Party so to notify the Indemnifying Party shall not relieve the Indemnifying Party of its obligations hereunder except to the extent that the Indemnifying Party is materially prejudiced by such failure to notify. In any such proceeding, any Indemnified Party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Indemnified Party unless (i) the Indemnifying Party and the Indemnified Party shall have mutually agreed to the retention of such counsel or (ii) in the reasonable judgment of such Indemnified Party representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that, in connection with any proceeding or related proceedings in the same jurisdiction, the Indemnifying Party shall not be liable for the reasonable fees and expenses of more than one separate firm of attorneys (in addition to any local counsel) at any time for all such Indemnified Parties, and that all such fees and expenses shall be reimbursed as they are incurred. In the case of any such separate firm for the Indemnified Parties, such firm shall be designated in writing by the Indemnified Parties. The Indemnifying Party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent, or if there be a final judgment for the plaintiff, the Indemnifying Party shall indemnify and hold harmless such Indemnified Parties from and against any Damages (to the extent stated above) by reason of such settlement or judgment. Without the prior written consent of the Indemnified Party, no Indemnifying Party shall effect any settlement of any pending or threatened proceeding in respect of which any Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such Indemnified Party, unless such settlement includes an unconditional release of such Indemnified Party from all liability arising out of such proceeding.

Section 1.08. Contribution. If the indemnification provided for in this Article 1 is unavailable to the Indemnified Parties in respect of any Damages, then each such Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall contribute to the amount paid or payable by such Indemnified Party as a result of such Damages (i) as between the Company and the Registering Stockholders holding Registrable Securities covered by a registration statement on the one hand and the underwriters on the other, in such proportion as is appropriate to reflect the relative benefits received by the Company and such Stockholders on the one hand and the underwriters on the other, from the offering of the Registrable Securities, or if such allocation is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits but also the relative fault of the Company and such Stockholders on the one hand and of such underwriters on the other in connection with the statements or omissions that resulted in such Damages, as well as any other relevant equitable considerations and (ii) as between the Company on the one hand and each such Stockholder on the other, in such proportion as is appropriate to reflect the relative fault of the Company and of each such Stockholder in connection with such statements or omissions, as well as any other relevant equitable considerations. The relative benefits received by the Company and such Stockholders on the one hand and such underwriters on the other shall be deemed to be in the same proportion as the total proceeds from the offering (net of underwriting discounts and commissions but before deducting expenses) received by the Company and such Stockholders bear to the total underwriting discounts and commissions received by such underwriters, in each case as set forth in the table on the cover page of the prospectus. The relative fault of the Company and such Stockholders on the one hand and of such underwriters on the other shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company and such Stockholders or by such underwriters. The relative fault of the Company on the one hand and of each such Stockholder on the other shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by such party, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The Company and the Registering Stockholders agree that it would not be just and equitable if contribution pursuant to this Section 1.08 were determined by pro rata allocation (even if the underwriters were treated as one Member for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in the immediately preceding paragraph. The amount paid or payable by an Indemnified Party as a result of the Damages referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such Indemnified Party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 1.08, no underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable Securities underwritten by it and distributed to the public were offered to the

public exceeds the amount of any Damages that such underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission, and no Registering Stockholder shall be required to contribute any amount in excess of the amount by which the net proceeds realized by such Stockholder in the sale of Registrable Securities of such Stockholder to which such Damages relate exceeds the amount of any Damages that such Stockholder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No Person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. Each Registering Stockholder’s obligation to contribute pursuant to this Section 1.08 is several in the proportion that the proceeds of the offering received by such Stockholder bears to the total proceeds of the offering received by all such Registering Stockholders and not joint.

Section 1.09. Participation in Public Offering. No Stockholder will be permitted to require registration of any Registrable Securities in any Public Offering hereunder unless such Stockholder (a) agrees to sell such Registrable Securities on the basis provided in any underwriting arrangements approved by the Persons entitled hereunder to approve such arrangements and (b) completes and executes all questionnaires, powers of attorney, indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements and the provisions of this Agreement in respect of registration rights.

Section 1.10. Other Indemnification. Indemnification similar to that specified herein (with appropriate modifications) shall be given by the Company and each Stockholder participating therein with respect to any required registration or other qualification of securities under any federal or state law or regulation or governmental authority other than the Securities Act.

Section 1.11. Cooperation by the Company. If any Stockholder shall transfer any Registrable Securities pursuant to Rule 144 of the Securities Act, the Company shall cooperate, to the extent commercially reasonable, with such Stockholder and shall provide to such Stockholder such information as such Stockholder shall reasonably request.

Section 1.12. No Transfer of Registration Rights. None of the rights of Stockholders under this Agreement shall be assignable by any Stockholder to any Person acquiring Securities in any Public Offering or pursuant to Rule 144 of the Securities Act.

Section 1.13. Restriction on Company Grants of Subsequent Registration Rights. The Company agrees that, without the prior written consent of the DLJMB Stockholders, it shall not enter into any agreement with the holder or prospective holder of any securities of the Company that would allow such holder or prospective holder any registration rights.

ARTICLE II

The following terms, as used herein, have the following meanings:

Section 2.01. “Affiliate” of any Person means any Person that directly, or indirectly through one or more intermediaries, controls, is controlled by or is under common control with such Person, and the term “Affiliated” shall have a correlative meaning.

Section 2.02. “Business Day” means any day, excluding Saturday, Sunday and any other day on which commercial banks in New York, New York are authorized or required by law to close.

Section 2.03. “Company Securities” means (i) the common stock of the Company, (ii) any other stock issued by the Company and (iii) any securities convertible into or exchangeable for, or options, warrants or other rights to acquire, common stock or any other stock issued by the Company.

Section 2.04. “DLJMB Stockholders” means DLJ Merchant Banking Partners IV, L.P., DLJMB Offshore Partners IV, L.P., DLJ Merchant Banking Partners IV (Pacific), L.P. and MBP IV Plan Investors, L.P., DLJ Merchant Banking Partners IV (Co-Investments), L.P.

Section 2.05. “Exchange Act” means the Securities Exchange Act of 1934, as amended and the rules and regulations promulgated thereunder.

Section 2.06. “Initial Public Offering” means the first Public Offering.

Section 2.07. “Management Stockholder” means any Stockholder who is an employee of the Company or any of its Subsidiaries. In no event shall any DLJMB Stockholder be deemed to be a Management Stockholder.

Section 2.08. “Other Stockholder” means all Stockholders other than the DLJMB Stockholders.

Section 2.09. “Person” means any individual or entity and, where the context so permits, the legal representatives, successors in interest and permitted assigns of such Person.

Section 2.10. “Public Offering” means an underwritten public offering of Company Securities pursuant to an effective registration statement under the Securities Act, other than pursuant to a registration statement on Form S-4 or Form S-8 or any similar or successor form.

Section 2.11. “Public Offering Limitations” means in each Public Offering, such Other Member shall be entitled to Transfer a number of the class of Company Securities to be Transferred in the Offering not exceeding (A) the number of Registrable Securities held by such Other Member at such time multiplied by (B) a fraction the numerator of which is the number of Registrable Securities to be registered by the DLJMB Members in any registration pursuant to Section 1.02 and the denominator of which is the total number of Registrable Securities held by the DLJMB Members immediately prior to any such registration.

Section 2.12. “Registrable Securities” means, at any time, any common stock of the Company until (i) a registration statement covering such shares has been declared effective by the SEC and such shares have been disposed of pursuant to such

effective registration statement, (ii) such shares are sold under Rule 144 under the Securities Act, (iii) such shares are then included in an effective registration statement filed pursuant to this Agreement or (iv) such shares are eligible for sale without registration pursuant to Rule 144 under the Securities Act without limitation thereunder on volume or manner of sale.

Section 2.13. “Registration Expenses” means any and all expenses incident to the performance of or compliance with any registration or marketing of securities, including all (i) registration and filing fees, and all other fees and expenses payable in connection with the listing of securities on any securities exchange or automated interdealer quotation system, (ii) fees and expenses of compliance with any securities or “blue sky” laws (including reasonable fees and disbursements of counsel in connection with “blue sky” qualifications of the securities registered), (iii) expenses in connection with the preparation, printing, mailing and delivery of any registration statements, prospectuses and other documents in connection therewith and any amendments or supplements thereto, (iv) security engraving and printing expenses, (v) internal expenses of the Company (including, without limitation, all salaries and expenses of its officers and employees performing legal or accounting duties), (vi) reasonable fees and disbursements of counsel for the Company and customary fees and expenses for independent certified public accountants retained by the Company (including the expenses relating to any comfort letters or costs associated with the delivery by independent certified public accountants of any comfort letters), (vii) reasonable fees and expenses of any special experts retained by the Company in connection with such registration, (viii) reasonable fees and out-of-pocket expenses of counsel to the Stockholders participating in the offering selected (A) by the DLJMB Members, in the case of any offering in which any DLJMB Members participate, or (B) in any other case, by the Stockholders holding the majority of the Registrable Securities to be sold for the account of all Stockholders in the offering, (ix) fees and expenses in connection with any review by FINRA of the underwriting arrangements or other terms of the offering, and all fees and expenses of any “qualified independent underwriter,” including the fees and expenses of any counsel thereto, (x) fees and disbursements of underwriters customarily paid by issuers or sellers of securities, but excluding any underwriting fees, discounts and commissions attributable to the sale of Registrable Securities, (xi) costs of printing and producing any agreements among underwriters, underwriting agreements, any “blue sky” or legal investment memoranda and any selling agreements and other documents in connection with the offering, sale or delivery of the Registrable Securities, (xii) transfer agents’ and registrars’ fees and expenses and the fees and expense of any other agent or trustee appointed in connection with such offering, (xiii) expenses relating to any analyst or investor presentations or any “road shows” undertaken in connection with the registration, marketing or selling of the Registrable Securities and (xiv) fees and expenses payable in connection with any ratings of the Registrable Securities, including expenses relating to any presentations to rating agencies.

Section 2.14. “Required Stockholders” means Stockholders of at least a majority in number of Registrable Securities.

Section 2.15. “SEC” means the United States Securities and Exchange Commission.

Section 2.16. “Securities Act” means the Securities Act of 1933, as amended and the rules and regulations promulgated thereunder.

ARTICLE III

Section 3.01. Termination. All rights and obligations of the Company hereunder shall terminate on the date on which no Registrable Securities are outstanding.

Section 3.02. Amendment and Waiver. This Agreement may not be amended except by an instrument in writing signed on behalf of each of the Company, the Required Stockholders of all Registrable Securities and any Stockholder that would be materially and disproportionately affected by such an amendment. Any party hereto may waive any right of such party hereunder by an instrument in writing signed by such party and delivered to the other parties. The failure of any party to enforce any of the provisions of this Agreement shall in no way be construed as a waiver of such provisions and shall not affect the right of such party thereafter to enforce each and every provision of this Agreement in accordance with its terms.

Section 3.03. Successors and Assigns. This Agreement shall not inure to the benefit of, or be binding on, or be assignable or transferable by any Stockholder to, any Person to the extent such Person acquires Company Securities in, or at any time following, the Initial Public Offering.

Section 3.04. Severability. If any provision of this Agreement shall be declared by any court of competent jurisdiction to be illegal, void or unenforceable, all other provisions of this Agreement shall not be affected and shall remain in full force and effect.

Section 3.05. Entire Agreement. Except as otherwise expressly set forth herein, this Agreement, together with the several agreements and other documents and instruments referred to herein or therein or annexed hereto or thereto, embody the complete agreement and understanding among the parties hereto with respect to the subject matter hereof and supersede and preempt any prior understandings, agreements or representations by or among the parties, written or oral, that may have related to the subject matter hereof in any way.

Section 3.06. Counterparts; Execution by Facsimile Signature. This Agreement may be executed in any number of counterparts, each of which shall be an

original, but all of which together shall constitute one instrument. This Agreement may be executed by facsimile signature(s).

Section 3.07. Notices. All notices required or permitted hereunder shall be in writing and shall be deemed effectively given (i) upon personal delivery to the party to be notified, (ii) when sent by confirmed facsimile if sent during normal business hours of the recipient, if not, then on the next Business Day or (iii) one Business Day after deposit with a nationally recognized overnight courier, specifying next day delivery, with written verification of receipt. All communications shall be sent to the addresses set forth below or such other address or facsimile number as a party may from time to time specify by notice to the other parties hereto:

If to the Company, at:

STR Holdings, Inc.
00 Xxxxx Xxxxxx
Xxxxxxxx, XX 00000
Telephone: 000-000-0000
Attention: Investor Relations

If to any Stockholder, to such Stockholder’s address as set forth in the register of shareholders maintained by the Company.

Section 3.08. Governing Law. THIS AGREEMENT SHALL BE GOVERNED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

Section 3.09. Consent to Jurisdiction. Each of the parties hereto hereby irrevocably and unconditionally consents to submit to the exclusive jurisdiction and venue of the United States District Court for the Southern District of New York and in the courts hearing appeals therefrom unless no basis for federal jurisdiction exists, in which event each party hereto irrevocably consents to the exclusive jurisdiction and venue of the Supreme Court of the State of New York, New York County, and the courts hearing appeals therefrom, for any action, suit or proceeding arising out of or relating to this Agreement and the transactions contemplated hereby. Each of the parties hereto irrevocably and unconditionally waives, and agrees not to assert, by way of motion, as a defense, counterclaim or otherwise, in any such action, suit or proceeding, any claim that such party is not personally subject to the jurisdiction of the aforesaid courts for any reason, other than the failure to serve process in accordance with this Section 3.09, that it or its property is exempt or immune from jurisdiction of any such court or from any legal process commenced in such courts (whether through service of notice, attachment prior to judgment, attachment in aid of execution of judgment, execution of judgment or otherwise), and to the fullest extent permitted by applicable law, that the action, suit or proceeding in any such court is brought in an inconvenient forum, that the venue of such action, suit or proceeding is improper, or that this Agreement, or the subject matter hereof, may not be enforced in or by such courts and further irrevocably waives, to the

fullest extent permitted by applicable law, the benefit of any defense that would hinder, xxxxxx or delay the levy, execution or collection of any amount to which the party is entitled pursuant to the final judgment of any court having jurisdiction. Each of the parties hereto expressly acknowledges that the foregoing waivers are intended to be irrevocable under the laws of the State of New York and of the United States of America; provided, that consent by the parties hereto to jurisdiction and service contained in this Section 3.11 is solely for the purpose referred to in this Section 2.09 and shall not be deemed to be a general submission to said courts or in the State of New York other than for such purpose.

Section 3.10. Waiver of Jury Trial. EACH PARTY TO THIS AGREEMENT HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY RIGHT TO TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION, OR CAUSE OF ACTION (A) ARISING UNDER THIS AGREEMENT OR (B) IN ANY WAY CONNECTED WITH OR RELATED OR INCIDENTAL TO THE DEALINGS OF THE PARTIES HERETO IN RESPECT OF THIS AGREEMENT OR ANY OF THE TRANSACTIONS RELATED HERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING, AND WHETHER IN CONTRACT, TORT, EQUITY, OR OTHERWISE. EACH PARTY TO THIS AGREEMENT HEREBY AGREES AND CONSENTS THAT ANY SUCH CLAIM, DEMAND, ACTION, OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT A JURY AND THAT THE PARTIES TO THIS AGREEMENT MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF THIS AGREEMENT WITH ANY COURT AS WRITTEN EVIDENCE OF THE CONSENT OF THE PARTIES HERETO TO THE WAIVER OF THEIR RIGHT TO TRIAL BY JURY.

IN WITNESS WHEREOF, each of the undersigned has caused this Agreement to be duly executed and delivered as of the date first written above.

	STR HOLDINGS, INC.


	By:	/s/ Xxxxx X. Xxxxxx
		Name: Xxxxx X. Xxxxxx
		Title: Executive Vice President and Chief Financial Office

	DLJ MERCHANT BANKING PARTNERS IV, L.P.
	By:	DLJ Merchant Banking IV, L.P., its General Partner
	By:	DLJ Merchant Banking, Inc., its General Partner

	By:	/S/ XXXXXXX XXXXXX
	Name:	Xxxxxxx Xxxxxx
	Title:	Vice President

	DLJ OFFSHORE PARTNERS IV, L.P.

	By:	DLJ Merchant Banking IV, L.P., its General Partner
	By:	DLJ Merchant Banking, Inc., its General Partner

	By:	/S/ XXXXXXX XXXXXX
	Name:	Xxxxxxx Xxxxxx
	Title:	Vice President

	DLJ MERCHANT BANKING PARTNERS IV (PACIFIC), L.P.
	By:	MBP IV Pacific, LLC, its General Partner
	By:	DLJ Merchant Banking IV, L.P., its Managing Member
	By:	DLJ Merchant Banking, Inc., its General Partner

	By:	/S/ XXXXXXX XXXXXX
	Name:	Xxxxxxx Xxxxxx
	Title:	Vice President

	MBP IV PLAN INVESTORS, L.P.
	By:	DLJ LBO Plans Management Corporation, its General Partner

	By:	/S/ XXXXXXX XXXXXX
	Name:	Xxxxxxx Xxxxxx
	Title:	Vice President

	By:	DLJ LBO Plans Management Corporation III, its General Partner

	By:	/S/ XXXXXXX XXXXXX
	Name:	Xxxxxxx Xxxxxx
	Title:	Vice President

[SIGNATURE PAGE TO THE REGISTRATION RIGHTS AGREEMENT]

	AXA EQUITABLE LIFE INSURANCE COMPANY

	By:	/S/ XXXXX XXXXXXX
	Name:	Xxxxx Xxxxxxx
	Title:	Investment Officer

	CREDIT SUISSE/CFIG STR INVESTORS SPV, LLCBy:
	DLJ MB Advisors, Inc., its Managing Member

	By:	/S/ XXXXXXX XXXXXX
	Name:	Xxxxxxx Xxxxxx
	Title:	Vice President


	THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY

	By:	/S/ XXXXXX XXXXX
	Name:	Xxxxxx Xxxxx
	Title:	Authorized Representative

	PRAIRIE FIRE TRUST

	By:	/S/ XXXX X. XXXXXXXXX
	Name:	Xxxx X. Xxxxxxxxx
	Title:	Authorized Designee

	MRS TRUST

	By:	/S/ XXXX X. XXXXXXXXX
	Name:	Xxxx X. Xxxxxxxxx
	Title:	Trustee

	XXXXXXX X. XXXXX 2008 GRAT

	By:	/S/ XXXX X. XXXXXXXXX
	Name:	Xxxx X. Xxxxxxxxx
	Title:	Trustee

	XXXXXXXXXX SOUND, LLC

	By:	/S/ XXXXXXXXX XXXXXXX
	Name:	Xxxxxxxxx Xxxxxxx
	Title:	Trustee of HS Trust its Member

[SIGNATURE PAGE TO THE REGISTRATION RIGHTS AGREEMENT]

	/S/ XXXXXXX X. XXXXX
	Xxxxxx X. Xxxxx

	/S/ XXXX X. XXXXXX
	Xxxx X. Xxxxxx

	/S/ XXXXXXXX X. XXXXXXX
	Xxxxxxxx X. Xxxxxxx

	/S/ XXXX XXXXXX
	Xxxx Xxxxxx

	/S/ XXXX X. XXXX
	Xxxx X. Xxxx

	/S/ XXXXXX X. XXXXXXXXX
	Xxxxxx X. Xxxxxxxxx

	/S/ XXXXX X XXXXXX
	Xxxxx X. Xxxxxx

	/S/ XXX XXXX XXXX
	Xxx Xxxx Xxxx

	/S/ XXXXXX X. XXXXX
	The Xxxxxx X. and Xxxxx X. Xxxxx Family Trust

	/S/ XXXXXX X. XXXXX
	Xxxxxx X. Xxxxx

	/S/ XXXXXX X. VITRO
	Xxxxxx X. Vitro

	/S/ XXXXXXX X. XXXXXXX
	Xxxxxxx X. Xxxxxxx

	/S/ XXXXXXX XXX XXXXXXXXXX
	Xxxxxxx Xxx Xxxxxxxxxx

	/S/ XXXXXXX XXXXXXX
	Xxxxxxx Xxxxxxx

	/S/ VARCHALA XXXXX
	Varchala Xxxxx

	/S/ XXXXXX X. XXXXXXXXXX
	Xxxxxx X. Xxxxxxxxxx

[SIGNATURE PAGE TO THE REGISTRATION RIGHTS AGREEMENT]

	/S/ XXXXXXX CHILDREY
	Xxxxxxx Childrey

	/S/ XXXXX X. XXXXXXX
	Xxxxx X. XxXxxxx

	/S/ XXXXXXX X. XXXXXX
	Xxxxxxx X. Xxxxxx

	/S/ XXX XXXXX XXXXX
	Xxx Xxxxx Xxxxx

	/S/ XXXXXX X. XXXXXX
	Xxxxxx X. Xxxxxx

	/S/ CHI XXX XXX
	Chi Xxx Xxx

	/S/ XXXXXX X. XXXXXXXX
	Xxxxxx X. Xxxxxxxx

	/S/ XXXXX XXXXXXXXXXX
	Xxxxx Xxxxxxxxxxx

	/S/ XXX X. XXXXXXX
	Xxx X. Xxxxxxx

	/S/ XXXXXX XXXXXXX
	Xxxxxx Xxxxxxx

	/S/ XXXXX X. XXXXX
	Xxxxx X. Xxxxx

	/S/ XXXXXX X. XXXXXXXXX
	Xxxxxx X. Xxxxxxxxx

	/S/ XXXXXX XXXXXX
	Xxxxxx Xxxxxx

	/S/ XXXXXXXXX XXXXXXX
	Xxxxxxxxx Xxxxxxx

	/S/ XXXX X. XXXXXX
	Xxxx X. Xxxxxx

	/S/ XXXX-XXXXXXX XXXXX
	Xxxx-Xxxxxxx Xxxxx

[SIGNATURE PAGE TO THE REGISTRATION RIGHTS AGREEMENT]

	/S/ XXXX X. XXXXXX
	Xxxx X. Xxxxxx

	/S/ XXX SING XXX
	Xxx Sing Xxx

	/S/ XXXX XXX XX
	Xxxx Xxx Xx

	/S/ XXXXXXXX XXXXXXX
	Xxxxxxxx Xxxxxxx

	/S/ XXXXX XXXXXX
	Xxxxx Xxxxxx

	/S/ XXXXXX XXXXX
	Xxxxxx Xxxxx

[SIGNATURE PAGE TO THE REGISTRATION RIGHTS AGREEMENT]

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REGISTRATION RIGHTS AGREEMENT

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