X0609 4 2026-10-12 0000812796 SOLIGENIX, INC. SNGX 0001433982 ZELDIS JEROME B false C/O SOLIGENIX, INC. 29 EMMONS DRIVE, SUITE B-10 PRINCETON NJ 08540 true false false false 0 Stock Option (Right to Buy) 549.60 2026-10-12 5 D 0 54 0 D 2017-06-08 2027-06-07 Common Stock 54 0 D Stock Option (Right to Buy) 400.80 2026-10-12 5 D 0 74 0 D 2018-09-27 2028-09-26 Common Stock 74 0 D Stock Option (Right to Buy) 232.80 2026-10-12 5 D 0 128 0 D 2019-09-06 2029-09-05 Common Stock 128 0 D Stock Option (Right to Buy) 472.80 2026-10-12 5 D 0 63 0 D 2020-09-16 2030-09-15 Common Stock 63 0 D Stock Option (Right to Buy) 247.20 2026-10-12 5 D 0 121 0 D 2021-09-23 2031-09-22 Common Stock 121 0 D Stock Option (Right to Buy) 156 2026-10-12 5 D 0 192 0 D 2022-11-17 2032-11-16 Common Stock 192 0 D On October 12, 2026, the Reporting Person voluntarily surrendered stock options exercisable for an aggregate of 632 shares of Common Stock with exercise prices set forth in the table above to the Issuer for cancellation for no consideration. The cancellation is exempt from Section 16(b) of the Exchange Act pursuant to Rule 16b-3(e) and Rule 16b-6(d), and exempt from the reporting requirements of Section 16(a) pursuant to Rule 16a-4(d). The Reporting Person is voluntarily reporting this transaction. That Reporting Person's Form 4 filed on September 18, 2026 reported an expiration date of June 16, 2036 for the Stock Option (Right to Buy) covering 78,947 shares of Common Stock at an exercise price of $0.38 per share, granted on September 17, 2026. That date was a typographical error. The correct expiration date of the option is September 16, 2036. /s/ Jerome B. Zeldis 2026-10-12