UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ____________ to ____________ Commission File No. 000-16929 SOLIGENIX, INC. (Exact name of registrant as specified in its charter) DELAWARE 41-1505029 (State or other jurisdiction of incorporation or organization) 29 EMMONS DRIVE, SUITE B-10 PRINCETON, NJ 08540 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) þ ANNUAL REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. For the Fiscal Year Ended December 31, 2018 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. For the transition period from ____________ to ____________ Commission File No. 000-16929 SOLIGENIX, INC. (Exact name of registrant as specified in its charter) | Delaware | 41-1505029 | | --- | --- | ...