X0303 4 2010-06-18 0 0000812796 SOLIGENIX, INC. SNGX 0001092601 SIGMA TAU FINANZIARIA SPA VIA SUDAFRICA, 20 ROME L6 00144 ITALY 0 0 1 0 0001170881 SIGMA TAU INTERNATIONAL SA 19-21 BOULEVARD DU PRINCE HENRI L-1724 N4 00000 LUXEMBOURG 0 0 1 0 0001385930 Sigma-Tau America S.A. 19-21 BOULVARD DU PRINCE HENRI L-1724 N4 00000 LUXEMBOURG 0 0 1 0 0001385625 Sigma-Tau Pharmaceuticals, Inc. 9841 WASHINGTONIAN BLVD. SUITE 500 GAITHERSBURG MD 20878 0 0 1 0 Common Stock 2010-06-18 4 P 0 8608580 0.205 A 54227816 I Indirect Common Stock Warrant (right to buy) 0.28 2010-06-18 4 J 0 1 0 A 2010-06-18 2015-06-18 Common Stock 5165148 1 I Indirect Shares directly owned by Sigma-Tau Pharmaceuticals, Inc. ("Pharmaceuticals"). Pharmaceuticals is a direct wholly-owned subsidiary of Sigma-Tau America S.A. ("America"). America is a direct wholly-owned subsidiary of Sigma-Tau International S.A. ("International"). International is a direct wholly-owned subsidiary of Sigma-Tau Finanziaria S.p.A. This warrant was issued by the Issuer to Pharmaceuticals in consideration of Pharmaceuticals' purchase of 8,608,580 shares of common stock on June 18, 2010. The expiration date of the warrant may be accelerated at the Issuer's option if the Issuers's common stock meets certain price thresholds and the common shares underlying the warrant are registered for resale pursuant to an effective registration statement or are freely transferable without volume restrictions pursuant to Rule 144 under the Securities Act of 1933, as amended. Exhibit List Exhibit 24.1 - Sigma-Tau Finanziaria S.p.A. Power of Attorney Exhibit 24.2 - Sigma-Tau International S.A. Power of Attorney Exhibit 24.3 - Sigma-Tau America S.A. Power of Attorney Exhibit 24.4 - Sigma-Tau Pharmaceuticals, Inc. Power of Attorney Exhibit 99 - Joint Filer Information /s/ Fabio Amabile, Attorney-in-fact 2010-06-21