Summit Therapeutics Inc.

and in Exhibits 99.1 and 99.2 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or

and in Exhibits 99.1, 99.2 and 99.3 shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, as amended, or otherwise subject to the liabilit

Financial Statements and Exhibits. (d) Exhibits Exhibit Number Description 99.1 Investor Presentation Slides made available on January 12, 2026 99.2 Press relea