X0306 4 2013-12-20 1 0001473597 STR HOLDINGS, INC. STRI 0001374588 RED MOUNTAIN CAPITAL PARTNERS LLC 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below. 0001374566 MESDAG WILLEM 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below. 0001374606 RMCP GP LLC 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below. 0001374607 RED MOUNTAIN CAPITAL MANAGEMENT INC 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below. 0001374603 RED MOUNTAIN PARTNERS, L.P. 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 1 0 Common Stock 2013-12-20 4 S 0 1150000 1.2804 D 4134982 I Through RMP Weighted average price of shares sold on the open market on December 20, 2013. RMCP LLC hereby undertakes to provide full information regarding the number of shares and prices at which these trades were effected upon request by the SEC staff, the issuer, or a securityholder of the issuer. Each of the reporting persons hereunder ceased to be a beneficial owner of more than 10% of the outstanding common stock of the issuer as of December 20, 2013 (based on 41,894,703 shares of Common Stock outstanding as of October 31, 2013, as reported in the Form 10-Q which was filed by the issuer with the Securities and Exchange Commission on November 12, 2013). These shares are held by Red Mountain Partners, L.P. ("RMP"). This Form 4 is jointly filed by (i) Red Mountain Capital Partners LLC ("RMCP LLC"), (ii) RMP, (iii) RMCP GP LLC ("RMCP GP"), (iv) Red Mountain Capital Management, Inc. ("RMCM"), and (v) Willem Mesdag. RMCP GP serves as the general partner of RMP. RMCP LLC is the managing member of RMCP GP. RMCM is the managing member of RMCP LLC. Mr. Mesdag is the president, sole executive officer, sole director and sole shareholder of RMCM. Each of the reporting persons hereunder disclaims beneficial ownership of the reported securities except to the extent of its or his pecuniary interests therein. This Form 4 shall not be deemed to be an admission that any reporting person hereunder is the beneficial owner of any of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. /s/ Willem Mesdag (on behalf of himself and the other reporting persons hereunder) 2013-12-23