UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): August 12, 2014

STR Holdings, Inc.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (860) 763-7014

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

x Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01.                                        Other Events.

On August 12, 2014, the Company held an investor conference call regarding the previously disclosed proposed transaction with Zhenfa Energy Group Co., Ltd. (the “Transaction”). A transcript of the conference call is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Additional Information and Where You Can Find It

In connection with the proposed transaction, STR intends to file relevant materials with the Securities and Exchange Commission (the “SEC”) and other governmental or regulatory authorities, including a proxy statement.  INVESTORS ARE URGED TO READ THESE MATERIALS WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE COMPANY, THE PURCHASER, ZHENFA AND THE TRANSACTION.  The proxy statement and certain other relevant materials (when they become available) and any other documents filed by STR with the SEC may be obtained free of charge at the SEC’s website at http://www.sec.gov. In addition, investors may obtain free copies of documents filed with the SEC by contacting STR’s Investor Relations at (860) 763-7014, x7437, or by accessing STR’s investor relations website at www.strsolar.com.  Investors are urged to read the proxy statement and information statement and other relevant materials when they become available before making any voting or investment decision with respect to the transaction.

Participants in the Solicitation

STR and its executive officers and directors may be deemed to be participating in the solicitation of proxies in connection with the Transaction.  Information about the executive officers and directors of STR and the number of shares of STR’s common stock beneficially owned by such persons is set forth in the proxy statement for STR’s 2014 annual meeting of stockholders which was filed with the SEC on April 1, 2014.  Investors may obtain additional information regarding the direct and indirect interests of STR and its executive officers and directors in the Transaction by reading the proxy statement regarding the Transaction when it becomes available.

ITEM 9.01 Financial Statements and Exhibits.

(d) Exhibits

2

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

3

EXHIBIT INDEX

4