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 Act of 1934

Date of Report (Date of earliest event reported): May 1, 2012

Synthesis Energy Systems, Inc.

(Exact name of registrant as specified in its charter)

(713) 579-0600

(Registrant’s telephone number, including area code)

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):

Item 8.01 Other Events.

On May 1, 2012, the Board of Directors (the “Board”) of Synthesis Energy Systems, Inc. (the “Company”) approved June 28, 2012 as the date for the Company’s Annual Meeting of Stockholders for the year ended June 30, 2011 (the “Meeting”) to be held at the Company’s principal executive offices located at Three Riverway, Suite 300, Houston, Texas 77056. The Board also approved May 29, 2012 as the record date for the the Meeting. Only stockholders of record at the close of business on that date may vote at the meeting or any adjournment thereof.

Because the Meeting will be held more than 30 days from the anniversary of the Company’s Annual Meeting of Stockholders for the year ended June 30, 2010 (the “Prior Meeting”), the Company has set a new deadline for the receipt of any stockholder proposals submitted pursuant to Rule 14a-8 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), for inclusion in the Company’s proxy materials for the Meeting. Such proposals must be delivered to Kevin Kelly, the Company’s Chief Accounting Officer, Controller and Secretary, at Synthesis Energy Systems, Inc., Three Riverway, Suite 300, Houston, Texas 77056 no later than the close of business on May 11, 2012 to be considered timely, which the Company has determined to be a reasonable time before the Company begins to print and send proxy materials. The Company recommends that such proposals be sent by certified mail, return receipt requested. Such proposals must also comply with the rules of the Securities and Exchange Commission regarding the inclusion of stockholder proposals in proxy materials, and may be omitted if not in compliance with applicable requirements.

Because the Meeting will be held more than 30 days from the anniversary of the Prior Meeting, in accordance with the Company’s Amended and Restated Bylaws, proposals of stockholders made outside of Rule 14a-8 under the Exchange Act must be received not later than the close of business on May 11, 2012 in order to be considered at the 2012 Annual Meeting of Stockholders. Such proposals must be delivered to the Kevin Kelly, the Company’s Chief Accounting Officer, Controller and Secretary, at Synthesis Energy Systems, Inc., Three Riverway, Suite 300, Houston, Texas 77056 and must also comply with all other requirements set forth in the Company’s Amended and Restated Bylaws and other applicable laws.

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 thereunto duly authorized.