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Summit Therapeutics (SMMT) Co‑CEO associated trust purchases 100,000 shares at $14.60

Filing Impact
(Very High)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

Summit Therapeutics Inc. director and Co‑CEO Robert W. Duggan reported an indirect open‑market purchase of 100,000 shares of Common Stock at $14.60 per share. The transaction was made by the Mahkam Zanganeh Revocable Trust, with his spouse as trustee, bringing that trust’s reported holdings to 25,824,474 shares.

The filing also lists additional positions associated with Duggan, including 570,073,879 shares held directly, 10,199,776 shares held by the Shaun Zanganeh Irrevocable Trust, 31,000 shares held by his spouse, and 76,680 shares held by an immediate family member of his spouse. A footnote states he disclaims beneficial ownership of these securities except to the extent of any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider DUGGAN ROBERT W
Role Co-Chief Executive Officer
Bought 100,000 shs ($1.46M)
Type Security Shares Price Value
Purchase Common Stock 100,000 $14.60 $1.46M
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 25,824,474 shares (Indirect, By the Mahkam Zanganeh Revocable Trust, with the Spouse of Reporting Person as Trustee); Common Stock — 570,073,879 shares (Direct, null)
Footnotes (1)
  1. [object Object]
Open-market purchase 100,000 shares Common Stock bought indirectly on transaction date
Purchase price $14.60/share Price paid for 100,000 Common Stock shares
Trust holdings post-transaction 25,824,474 shares Mahkam Zanganeh Revocable Trust total after purchase
Direct holdings 570,073,879 shares Common Stock held directly by reporting person
Shaun Zanganeh Irrevocable Trust 10,199,776 shares Indirect Common Stock holdings via this trust
Spouse holdings 31,000 shares Common Stock held indirectly by spouse
Immediate family member holdings 76,680 shares Common Stock held by immediate family member of spouse
open-market purchase financial
"Purchase in open market or private transaction"
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
indirect ownership financial
"ownership_type": "indirect" and ownership_code": "I""
revocable trust financial
"By the Mahkam Zanganeh Revocable Trust, with the Spouse of Reporting Person as Trustee"
A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.
irrevocable trust financial
"By the Shaun Zanganeh Irrevocable Trust, with the Spouse of Reporting Person as Trustee"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
pecuniary interest financial
"except to the extent of his pecuniary interest therein, if any"
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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
DUGGAN ROBERT W

(Last)(First)(Middle)
C/O SUMMIT THERAPEUTICS INC.
601 BRICKELL KEY DRIVE SUITE 1000

(Street)
MIAMI FLORIDA 33131

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Summit Therapeutics Inc. [ SMMT ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirectorX10% Owner
XOfficer (give title below)Other (specify below)
Co-Chief Executive Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock06/04/2026P100,000A$14.625,824,474(1)IBy the Mahkam Zanganeh Revocable Trust, with the Spouse of Reporting Person as Trustee
Common Stock570,073,879D
Common Stock76,680(1)IImmediate family member of Spouse
Common Stock31,000(1)IBy Spouse
Common Stock10,199,776(1)IBy the Shaun Zanganeh Irrevocable Trust, with the Spouse of Reporting Person as Trustee
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. 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.
Remarks:
/s/ Robert W. Duggan06/04/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Summit Therapeutics (SMMT) insider Robert Duggan report in this Form 4?

He reported an indirect open‑market purchase of 100,000 Summit Therapeutics common shares at $14.60 per share through the Mahkam Zanganeh Revocable Trust, along with updated totals for several direct and indirect shareholdings associated with him and related parties.

At what price were the new Summit Therapeutics (SMMT) shares purchased?

The filing shows an open‑market purchase price of $14.60 per share for 100,000 Summit Therapeutics common shares. This transaction increased the Mahkam Zanganeh Revocable Trust’s reported holdings while leaving existing direct and other indirect positions separately reported in the same document.

How many SMMT shares does the Mahkam Zanganeh Revocable Trust hold after this transaction?

After buying 100,000 Summit Therapeutics shares, the Mahkam Zanganeh Revocable Trust is reported to hold 25,824,474 common shares. The trust is identified as having the insider’s spouse as trustee, and the position is classified as indirect ownership on the Form 4.

What are Robert Duggan’s reported direct SMMT holdings in this filing?

The Form 4 lists 570,073,879 Summit Therapeutics common shares as held directly. This direct position is shown separately from multiple indirect holdings through trusts, spouse, and an immediate family member of his spouse, each with its own reported share balance.

What other indirect Summit Therapeutics (SMMT) holdings are reported besides the trust that bought shares?

The filing shows 10,199,776 shares held by the Shaun Zanganeh Irrevocable Trust, 31,000 shares held by the spouse, and 76,680 shares held by an immediate family member of the spouse. All are classified as indirect ownership positions associated with the reporting person.

Does Robert Duggan claim full beneficial ownership of all reported SMMT shares?

A footnote states he disclaims beneficial ownership of the reported securities except to the extent of any pecuniary interest. This language is common when shares are held through trusts, spouses, or family members, and clarifies the extent of his recognized economic interest.