Robert W. Duggan - 12 Jun 2026 Form 4 Insider Report for Summit Therapeutics Inc. (SMMT)

Reporting relationship: Co-Chief Executive Officer, Director, 10%+ Owner
Issuer ticker: SMMT
Reported as of: 12 Jun 2026
Net transaction value: +$49,987,200
SEC form: 4
Accepted by SEC: 12 Jun 2026, 12:28:50 UTC
Prior SEC filing: 15 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Robert W. Duggan

Key filing fact

Robert W. Duggan filed Form 4 for Summit Therapeutics Inc. (SMMT) on 12 Jun 2026.

Key facts

This page summarizes Robert W. Duggan's Form 4 filing for Summit Therapeutics Inc. (SMMT).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 12 Jun 2026, 12:28.

Change

Previous filing in this sequence was filed on 15 Jun 2026.
Current net transaction value: +$49,987,200.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001055919 Primary reporting owner

DUGGAN ROBERT W

Relationship: Co-Chief Executive Officer, Director, 10%+ Owner
Address: C/O SUMMIT THERAPEUTICS INC., 601 BRICKELL KEY DRIVE SUITE 1000, MIAMI
Signature: /s/ Robert W. Duggan
Signature date: 12 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SMMT transaction

Common Stock

Purchase

Transaction value: $49,987,200
Shares: +3,810,000
Change %: +0.67%
Price: $13.12
Shares after: 573,883,879
Date: 12 Jun 2026
Ownership: Direct

SMMT holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 25,824,474
Date: 12 Jun 2026
Ownership: By the Mahkam Zanganeh Revocable Trust, with the Spouse of Reporting Person as Trustee
Footnotes: F1

SMMT holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 76,680
Date: 12 Jun 2026
Ownership: Immediate family member of Spouse
Footnotes: F1

SMMT holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 31,000
Date: 12 Jun 2026
Ownership: By Spouse
Footnotes: F1

SMMT holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 10,199,776
Date: 12 Jun 2026
Ownership: By the Shaun Zanganeh Irrevocable Trust, with the Spouse of Reporting Person as Trustee
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.