This Amendment No. 3 (this Amendment) amends and supplements the
Solicitation/Recommendation Statement on Schedule 14D-9 (as amended or supplemented from time to time, the Schedule 14D-9) filed by Deciphera
Pharmaceuticals, Inc., a Delaware corporation (Deciphera), with the Securities and Exchange Commission (the SEC) on May 13, 2024, relating to the tender offer by Topaz Merger Sub, Inc., a Delaware
corporation (Merger Sub) and a wholly owned subsidiary of Ono Pharmaceutical Co., Ltd., a Japanese company (kabushiki kaisha) (ONO), to acquire all of the issued and outstanding shares of common stock,
par value $0.01 per share, of Deciphera (the Shares) at a price per Share of $25.60, net to the seller in cash, without interest and subject to any withholding of taxes required by applicable law, upon the terms and subject to the
conditions set forth in the Offer to Purchase, dated May 13, 2024 (as amended or supplemented from time to time, the Offer to Purchase), and in the related Letter of Transmittal, each as filed by ONO and Merger Sub with the
SEC on May 13, 2024 (as amended or supplemented from time to time, the Letter of Transmittal, which, together with the Offer to Purchase, constitute the Offer).
Except to the extent specifically provided in this Amendment, the information set forth in the Schedule 14D-9 remains
unchanged. Capitalized terms used, but not otherwise defined, in this Amendment shall have the meanings ascribed to them in the Schedule 14D-9. This Amendment is being filed to reflect certain amendments and
updates as reflected below.
ITEM 8. ADDITIONAL INFORMATION
Item 8 of the Schedule 14D-9 is hereby amended and supplemented by adding the following new subsection before the final
subsection entitled Cautionary Note Regarding Forward-Looking Statements at the end of such Item 8:
Final Results of the Offer and
Completion of the Merger
The Offer expired at one minute after 11:59 p.m. New York City Time, on June 10, 2024. Computershare Trust Company, N.A.,
in its capacity as depositary for the Offer, advised that, as of the expiration of the Offer, a total of 76,413,423 Shares were validly tendered and not validly withdrawn pursuant to the Offer, representing approximately 88.3% of the Shares
outstanding as of the expiration of the Offer. As of the expiration of the Offer, the number of Shares validly tendered and not validly withdrawn pursuant to the Offer satisfied the Minimum Condition. Promptly after the expiration of the Offer,
Merger Sub irrevocably accepted for payment all Shares validly tendered and not validly withdrawn pursuant to the Offer. Merger Sub will promptly pay for all such Shares.