Washington, D.C. 20549




Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934


Filed by the Registrant x
Filed by a Party other than the Registrant ¨
Check the appropriate box:
¨ Preliminary Proxy Statement
¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
¨ Definitive Proxy Statement
x Definitive Additional Materials
¨ Soliciting Material under §240.14a-12


(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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¨ Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
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¨ Fee paid previously with preliminary materials.
¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
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Onconova Therapeutics, Inc., a Delaware corporation (the “Company”), is filing materials contained in this Schedule 14A with the U.S. Securities and Exchange Commission (the “SEC”) as definitive additional materials pursuant to Rule 14a-6(b) under the Securities Exchange Act of 1934, as amended, in connection with the solicitation of proxies by the Board of Directors for the Company’s Special Meeting of Stockholders adjourned to April 1, 2021. On January 13, 2021, the Company filed a definitive proxy statement and a definitive form of proxy card with the SEC in connection with the Company’s Special Meeting of Stockholders held on March 4, 2021.


Additional Proxy Solicitor effective March 29, 2021


On March 29, 2021, the Company engaged Alliance Advisors, LLC to assist with proxy solicitation at a cost of $15,000, plus additional call center charges.