Summit Therapeutics expands ATM offering capacity by $360M to total $450M

Summit Therapeutics Inc.

Increased ATM equity offering capacity by $360M; total authorized up to $450M under agreement with J.P. Morgan.
As of Aug 11, 2025, approximately $45.8M remained available for sale under the prior $90M facility.
New prospectus supplement filed Aug 11, 2025; terms unchanged (3% commission, at-the-market sales).
Company retains discretion; no obligation to sell any shares under the agreement.

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