Certain Warrants of Onconova Therapeutics, Inc. are subject to a Lock-Up Agreement Ending on 23-DEC-2021. These Warrants will be under lockup for 91 days starting from 23-SEP-2021 to 23-DEC-2021. Details: The company's stockholders and our directors and executive officers have agreed with the underwriters that, subject to certain customary exceptions, without the prior written consent of Guggenheim Securities, LLC on behalf of the underwriters, they will not, for the Lock-Up Period i.e. 90 days after the date of the prospectus, directly or indirectly, (a) offer, pledge, sell, contract to sell, solicit offers to purchase, grant any call option or purchase any put option with respect to, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of common stock or any securities convertible into or exercisable or exchangeable for common stock.