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): September 21, 2015

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:

Item 1.01. Entry into a Material Definitive Agreement

On September 21, 2015 and September 24, 2015, Document Security Systems, Inc. (the “Company”) entered into securities purchase agreements with certain accredited investors for the sale of an aggregate of 2,045,454 shares of common stock at a purchase price of $0.22 per share, for a total purchase price of $450,000. In addition to common stock, the purchasers will receive accompanying four-year warrants to purchase up to an aggregate of 409,091 additional shares of common stock, first exercisable on or after March 22, 2016, and March 25, 2016. As previously reported, as of September 17, 2015, we had entered into securities purchase agreements with investors for an aggregate of $500,000 worth of common stock and warrants.

The offering is being made pursuant to a prospectus supplement to be filed with the Securities and Exchange Commission and an accompanying prospectus dated November 1, 2013, pursuant to the Company’s shelf registration statement on Form S-3 that was filed with the Securities and Exchange Commission on October 11, 2013 and became effective on November 1, 2013 (File No. 333-191704). The offering is ongoing, and is expected to consist of multiple closings on the same terms to occur on or before September 30, 2015. The Company is offering a number of shares of common stock that could result in aggregate sales proceeds of up to $2.02 million. The form of securities purchase agreement contains customary representations, warranties, and covenants by us and the investors. The accompanying form of warrant contains customary clauses relating to exercise, adjustments for stock dividends and splits, and transferability. No placement agent or underwriter is involved in the offering.

A copy of the form of securities purchase agreement is incorporated herein by reference to Exhibit 10.1 of this report. The foregoing description of the securities purchase agreement is not complete and is qualified in its entirety by reference to Exhibit 10.1. A copy of the form of warrant is incorporated herein by reference to Exhibit 10.2 to this report. The foregoing description of the warrant is not complete and is qualified in its entirety by reference to Exhibit 10.2.

Item 9.01. Financial Statements and Exhibits

SIGNATURES

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.