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): May 29, 2014 (May 22, 2014)

ASCENT SOLAR TECHNOLOGIES, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (720) 872-5000

Not Applicable

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:

On May 29, 2014, the Company closed on the issuance of 300 additional shares of Series C Preferred Stock to Ironridge Technology Co., a division of Ironridge Global IV, Ltd., a British Virgin Islands business company (“Ironridge”), at a purchase price for each share of Series C Preferred Stock of $10,000 per share. The closing resulted in gross proceeds to the Company of $3,000,000.

This transaction was the second tranche closing contemplated by the Stock Purchase Agreement (“SPA”) with Ironridge dated April 1, 2014. On April 1, 2014, the Company closed the first tranche under the SPA. The first tranche closing also resulted in the Company issuing 300 shares of Series C Preferred Stock to Ironridge and the Company receiving gross proceeds of $3,000,000.

On May 1, 2014, the Company issued 30 shares of Series C Preferred Stock to Ironridge pursuant to the Registration Rights Agreement (“RRA”) between the Company and Ironridge. Under the RRA, the Company filed a resale registration statement with the Securities and Exchange Commission registering the shares of Common Stock which may be issued upon (i) conversion of the Series C Preferred Stock, and (ii) the payment by the Company of dividends and make whole amounts (if any) on the Series C Preferred Stock. Under the RRA, the Company was required to issue such 30 additional shares of Series C Preferred Stock because such registration statement was not declared effective by May 1, 2014. Such registration statement became effective on May 25, 2014. The Company did not receive any gross proceeds in connection with this issuance.

The terms of the Series C Preferred Stock issued by the Company are described in our Current Report on Form 8-K dated April 2, 2014.

With the second tranche closing, the Company has completed the financing transactions under the SPA with Ironridge. We have issued a total of 630 shares of Series C Preferred Stock to Ironridge pursuant to the SPA. If all such shares of Series C Preferred Stock were immediately converted, we would be required to issue (i) approximately 5.5 million common shares upon conversion and (ii) assuming a current stock price of $0.40, approximately 14.7 million additional common shares in the event the Company would elect to pay dividends and make-whole amounts due on the Series C Preferred Stock in the form of shares rather than cash.

The actual number of shares that we would be required to issue to pay dividends and make-whole amounts due on the Series C Preferred Stock in the form of shares rather than cash will fluctuate, since it would be based on our then current stock price at the time the investor elects to convert Series C Preferred Stock. Our registration statement covering the potential resale of common shares that may issued in connection with the Series C Preferred Stock registered 21 million common shares in the aggregate.

The shares of Series C Preferred Stock were offered and sold in reliance upon exemption from registration pursuant to Section 4(2) under the Securities Act of 1933, as amended (“Securities Act”), and Rule 506 of Regulation D promulgated thereunder. The offering was made to an “accredited investor” (as defined by Rule 501 under the Securities Act).

The Company held its Annual Meeting of Stockholders (“Annual Meeting”) on May 22, 2014. The matters voted upon at the Annual Meeting and the results of such voting are set forth below.

Proposal 1 - Election of two Class 3 directors until the 2017 annual meeting of stockholders and until their successors are duly elected and qualified.

The director nominees were duly elected.

Proposal 2 - Ratification of appointment of Independent Registered Public Accounting Firm.

Proposal 2 was approved.

Proposal 3 - Non-binding advisory approval of the compensation of our executive officers.

Proposal 3 was approved.

Proposal 4 - To approve an amendment to the Company’s certificate of incorporation to effect a reverse stock split of the Company’s issued and outstanding common stock.

Proposal 4 was approved.

Proposal 5 - Approval of the issuance of certain shares of common stock in connection with 1,000 authorized shares of the Company’s Series C preferred stock.

Proposal 5 was approved.

Proposal 6 - Amendment and Restatement of 2008 Restricted Stock Plan

Proposal 6 was approved.

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.