Form SC 13G/A STR HOLDINGS, INC. Filed by: B. Riley & Co., LLC

As of the close of business on the date hereof, RIP owned directly 175,920 shares of Common Stock. RIM, as the investment advisor and general partner of RIP, may be deemed to beneficially own the 175,920 shares of Common Stock owned directly by RIP. Mr. Riley, as the Managing Member of RIP, may be deemed to beneficially own the 175,920 shares of Common Stock owned directly by RIP.

As of the close of business on the date hereof, BRC owned directly 180,901 shares of Common Stock. Mr. Riley, as the Chairman of BRC, may be deemed to beneficially own the 180,901 shares of Common Stock owned directly by BRC.

As of the close of business on the date hereof, BRC Profit Sharing Plan owned directly 33,333 shares of Common Stock. Mr. Riley, as the Trustee of BRC Profit Sharing Plan, may be deemed to beneficially own the 33,333 shares of Common Stock owned directly by BRC Profit Sharing Plan.

As of the close of business on the date hereof, Mr. Riley beneficially owned 111,666 shares of Common Stock, 228,181 shares of Common Stock held in custodial accounts for the benefit of his family members of which he is the custodian and 3,119 shares of restricted Common Stock he received in his capacity as a director of the Issuer.

The foregoing should not be construed as an admission by any Reporting Person as to beneficial ownership of any shares of Common Stock owned by another Reporting Person. Each of the Reporting Persons disclaims beneficial ownership of the shares of Common Stock that are not directly owned by such Reporting Person.

The aggregate percentage of shares reported owned by each Reporting Person is based upon 8,854,963 shares outstanding. This number is calculated by the 26,564,889 shares outstanding as of October 31, 2014, according to the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 13, 2014, adjusted for the reverse stock split of the Issuer’s common stock at a ratio of one share-for-every three shares of outstanding common stock, according to the Certificate of Amendment to the Issuer’s Certificate of Incorporation filed with the Security of State of the State of Delaware on January 30, 2015.

As of the close of business on the date hereof, RIP owned directly approximately 2.0% of the outstanding shares of Common Stock. By virtue of their relationships with RIP described above in Item 4(a), each of RIM and Mr. Riley may be deemed to beneficially own the approximately 2.0% of the outstanding shares of Common Stock owned directly by RIP.

As of the close of business on the date hereof, BRC owned directly approximately 2.0% of the outstanding shares of Common Stock. By virtue of his relationship with BRC described above in Item 4(a), Mr. Riley may be deemed to beneficially own the approximately 2.0% of the outstanding shares of Common Stock owned directly by BRC.

As of the close of business on the date hereof, BRC Profit Sharing Plan owned directly approximately 0.4% of the outstanding shares of Common Stock. By virtue of his relationship with BRC Profit Sharing Plan described above in Item 4(a), Mr. Riley may be deemed to beneficially own the approximately 0.4% of the outstanding shares of Common Stock owned directly by BRC Profit Sharing Plan.

As of the close of business on the date hereof, Mr. Riley beneficially owned the approximately 1.3% of the outstanding shares of Common Stock, the approximately 2.6% of the outstanding shares of Common Stock held in custodial accounts for the benefit of his family members, and the approximately 0.04% of the outstanding shares of restricted Common Stock he received in his capacity as a director of the Issuer, which, together with the approximately 4.4% of the outstanding shares of Common Stock collectively owned by RIP, BRC and BRC Profit Sharing Plan that Mr. Riley may also be deemed to beneficially own, constitutes approximately 8.3% of the outstanding shares of Common Stock.