UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 SG BLOCKS, INC. (Exact name of registrant as specified in its charter) 195 Montague Street, 14 th Floor, Brooklyn, NY 11201 (Address of principal executive offices) (Zip Code) (646) 240-4235 (Registrant's telephone number, including area code) OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) ...