---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-178022"
form_type: "8-K"
ticker: "SMMT"
cik: "0001599298"
company_name: "Summit Therapeutics Inc."
filed_at: "2025-08-11T23:59:59+00:00"
generated_at: "2026-05-17T15:28:36.641477+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

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

## Summary
- 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.

## SEC filing metadata
- accession: 0001193125-25-178022
- form_type: 8-K
- ticker: SMMT
- cik: 0001599298
- company_name: Summit Therapeutics Inc.
- filed_at: 2025-08-11T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1599298/000119312525178022/0001193125-25-178022-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1599298/000119312525178022/d56029d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-178022
- JSON: https://secwatch.observer/filing/0001193125-25-178022.json
- Plain text: https://secwatch.observer/filing/0001193125-25-178022.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.