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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

Information Required in Proxy Statement

Schedule 14a Information

Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934

(Amendment No.)

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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

    ☒    Definitive Additional Materials

    ☐    Soliciting Material Under Rule 14a-12

SUMMIT THERAPEUTICS INC.
(Name of Registrant as Specified in Its Charter)
(Name of Persons(s) Filing Proxy Statement, if Other Than the Registrant)

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