Seres Therapeutics (MCRB) awards 6,500 stock options to director Claire Fraser

Rhea-AI Filing Summary

Seres Therapeutics, Inc. reported that director Claire Fraser received a grant of stock options covering 6,500 shares of common stock at an exercise price of $7.14 per share. The options expire on July 7, 2036 and vest and become exercisable on the earlier of July 8, 2027 or the day immediately prior to the first annual meeting of stockholders occurring after July 8, 2026. Following this award, Fraser holds options for 6,500 shares directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Fraser Claire

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	6,500	$0.00	--

Holdings After Transaction: Stock Option (right to buy) — 6,500 shares (Direct)

Footnotes (1)

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Key Figures

Options granted: 6,500 options Exercise price: $7.14 per share Underlying shares: 6,500 shares +3 more

6 metrics

Options granted 6,500 options Stock Option (right to buy) granted to director Claire Fraser

Exercise price $7.14 per share Exercise price of options to purchase Seres Therapeutics common stock

Underlying shares 6,500 shares Number of common shares underlying the stock options

Expiration date July 7, 2036 Expiration date of the stock option award

Latest vesting date July 8, 2027 Latest possible vesting date, subject to earlier vesting before first annual meeting after July 8, 2026

Post-transaction options held 6,500 options Total options held directly by Claire Fraser following the award

Key Terms

Stock Option (right to buy), exercise price, vests and becomes exercisable, annual meeting of the Company's stockholders

4 terms

Stock Option (right to buy) financial

"security_title: Stock Option (right to buy)"

exercise price financial

"conversion_or_exercise_price: 7.1400"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vests and becomes exercisable financial

"The option vests and becomes exercisable on the earlier to occur"

annual meeting of the Company's stockholders regulatory

"the first annual meeting of the Company's stockholders occurring after July 8, 2026"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/10/2026 - 04:15 PM Accepted by SEC EDGAR 07/10/2026 - 04:15 PM Learn about SEC filing dates

FAQ

What did Seres Therapeutics (MCRB) disclose about Claire Fraser in this Form 4?

Seres Therapeutics disclosed that director Claire Fraser received a grant of 6,500 stock options to purchase common stock at an exercise price of $7.14 per share, vesting based on future director service milestones.

How many stock options did Claire Fraser receive from Seres Therapeutics (MCRB)?

Claire Fraser received a grant of 6,500 stock options. These options relate to an equal number of underlying shares of common stock and represent a compensation award granted in her capacity as a director.

What is the exercise price of Claire Fraser’s options at Seres Therapeutics (MCRB)?

The exercise price of Claire Fraser’s options is $7.14 per share. This is the price she would pay per share to purchase Seres Therapeutics common stock once the options have vested and become exercisable.

When do Claire Fraser’s Seres Therapeutics (MCRB) options vest and become exercisable?

The options vest on the earlier of July 8, 2027 or the day immediately prior to the first annual meeting of stockholders occurring after July 8, 2026, tying vesting to future board service.

What is the expiration date of Claire Fraser’s stock options at Seres Therapeutics (MCRB)?

Claire Fraser’s stock options expire on July 7, 2036. After this date, any unexercised portion of the 6,500 options will lapse and can no longer be used to purchase Seres Therapeutics common stock.

How many Seres Therapeutics (MCRB) options does Claire Fraser hold after this grant?

Following this grant, Claire Fraser holds 6,500 stock options directly. This reflects the full amount of the newly awarded options, as this filing does not show any option exercises or sales.

SEC Form 4

FORM 4

UNITED 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^*

Fraser Claire

(Last) (First) (Middle)

C/O SERES THERAPEUTICS, INC.

101 CAMBRIDGE PARK DRIVE

(Street)

CAMBRIDGE MASSACHUSETTS 02140

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Seres Therapeutics, Inc. [ MCRB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$7.14	07/08/2026		A		6,500		(1)	07/07/2036	Common Stock	6,500	$0	6,500	D

Explanation of Responses:

1. The option vests and becomes exercisable on the earlier to occur of (i) July 8, 2027 or (ii) the day immediately prior to the first annual meeting of the Company's stockholders occurring after July 8, 2026.

	/s/ Thomas J. DesRosier, Attorney-in-Fact	07/10/2026
	** Signature of Reporting Person	Date
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)