---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-245790"
form_type: "8-K"
ticker: "SMMT"
cik: "0001599298"
company_name: "Summit Therapeutics Inc."
filed_at: "2025-10-22T23:59:59+00:00"
generated_at: "2026-05-17T02:45:36.680849+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Summit Therapeutics raises $500M in private placement at $18.74/share; insiders invest $282M

## Summary
- Raised $500M gross and net proceeds from sale of 26.68M shares at $18.74 each, the closing price on Oct 21, 2025.
- Insiders including Duggan, Zanganeh, Soni, Anand contributed $272M; Akeso added $10M, total insider investment $282M.
- Proceeds will fund clinical development of ivonescimab and general corporate purposes.
- Closing expected on or before October 28, 2025, subject to customary conditions.
- Shares issued in a private placement exempt from registration; resale registration to be filed by Dec 19, 2025.

## SEC filing metadata
- accession: 0001193125-25-245790
- form_type: 8-K
- ticker: SMMT
- cik: 0001599298
- company_name: Summit Therapeutics Inc.
- filed_at: 2025-10-22T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 1.01, 3.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1599298/000119312525245790/0001193125-25-245790-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1599298/000119312525245790/d274712d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-245790
- JSON: https://secwatch.observer/filing/0001193125-25-245790.json
- Plain text: https://secwatch.observer/filing/0001193125-25-245790.txt

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