Joint Filer Information

Name: Sigma-Tau International S.A.

Address:

19-21 Boulevard du Prince Henri

L-1724 Luxembourg

Designated Filer: Sigma-Tau Finanziaria S.p.A.

Issuer & Ticker Symbol: Soligenix, Inc. (SNGX)

Date of Earliest

Transaction Required

to be Reported: 12/20/12

Signature: /s/ Fabio Amabile_________________

Name: Fabio Amabile

Title: Attorney-in-fact

SIGMA-TAU INTERNATIONAL S.A.

Name: Sigma-Tau America S.A.

Address: 19-21 Boulevard du Prince Henri

L-1724 Luxembourg

Designated Filer: Sigma-Tau Finanziaria S.p.A.

Issuer & Ticker Symbol: Soligenix, Inc. (SNGX)

Date of Earliest

Transaction Required

to be Reported: 12/20/12

Signature: /s/ Fabio Amabile___________

Name: Fabio Amabile

Title: Attorney-in-fact

SIGMA-TAU AMERICA S.A.

Name: Sigma-Tau Pharmaceuticals, Inc.

Address: 9841 Washingtonian Blvd, Suite 500

Gaithersburg, Maryland 20878

USA

Designated Filer: Sigma-Tau Finanziaria S.p.A.

Issuer & Ticker Symbol: Soligenix, Inc. (SNGX)

Date of Earliest

Transaction Required

to be Reported: 12/20/12

Signature: /s/ Fabio Amabile______________________

Name: Fabio Amabile

Title: Attorney-in-fact

SIGMA-TAU PHARMACEUTICALS, INC.

SIGMA TAU FINANZIARIA SPA 4