Traws Pharma, Inc. — Director's Dealing 2015

May 9, 2015

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Onconova Therapeutics, Inc. (ONTX)
CIK: 0001130598
Period of Report: 2015-05-06

Reporting Person: Baxalta GmbH (10% Owner)
Reporting Person: Baxalta Inc (10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2603295	Direct

Footnotes

F1: In preparation for the anticipated spin-off by Baxter International Inc. ("Baxter") of Baxalta Incorporated ("Baxalta"), the reported securities were transferred from Baxter Healthcare SA, an indirectly wholly-owned subsidiary of Baxter to its affiliate Baxalta GmbH, which is also an indirect wholly-owned subsidiary of Baxter. In preparation for the anticipated spin-off, Baxter and Baxalta are engaging in a series of reorganization transactions, including the transfer of reported shares, which are anticipated to result in Baxalta GmbH becoming an indirect wholly-owned subsidiary of Baxalta.

F2: The reported securities are beneficially owned by Baxalta GmbH and may be deemed to be or become indirectly beneficially owned by Baxalta as a result of the reorganization transactions in preparation for the anticipated spin-off.