New insider Brady Kelly claimed ownership of 8,441 shares (SEC Form 3)
$MCRB
Biotechnology: Pharmaceutical Preparations
Health Care
| FORM 3 |
UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940 |
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1. Name and Address of Reporting Person*
(Street)
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2. Date of Event Requiring Statement
(Month/Day/Year) 03/02/2026 |
3. Issuer Name and Ticker or Trading Symbol
Seres Therapeutics, Inc. [ MCRB ] |
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4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
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5. If Amendment, Date of Original Filed
(Month/Day/Year) |
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6. Individual or Joint/Group Filing (Check Applicable Line)
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| Table I - Non-Derivative Securities Beneficially Owned | |||
|---|---|---|---|
| 1. Title of Security (Instr. 4) | 2. Amount of Securities Beneficially Owned (Instr. 4) | 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) | 4. Nature of Indirect Beneficial Ownership (Instr. 5) |
| Common Stock | 8,441 | D | |
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) | |||||||
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| 1. Title of Derivative Security (Instr. 4) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) | 4. Conversion or Exercise Price of Derivative Security | 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) | 6. Nature of Indirect Beneficial Ownership (Instr. 5) | ||
| Date Exercisable | Expiration Date | Title | Amount or Number of Shares | ||||
| Stock Option (right to buy) | (1) | 02/13/2034 | Common Stock | 2,925 | $22 | D | |
| Stock Option (right to buy) | (2) | 02/06/2035 | Common Stock | 11,700 | $15.64 | D | |
| Stock Option (right to buy) | (3) | 02/11/2034 | Common Stock | 2,000 | $23 | D | |
| Stock Option (right to buy) | (3) | 02/11/2034 | Common Stock | 869 | $23 | D | |
| Stock Option (right to buy) | (3) | 02/11/2034 | Common Stock | 812 | $23 | D | |
| Stock Option (right to buy) | (3) | 02/11/2034 | Common Stock | 2,343 | $23 | D | |
| Stock Option (right to buy) | (4) | 02/11/2034 | Common Stock | 1,430 | $23 | D | |
| Restricted Stock Units | (5) | (5) | Common Stock | 358 | $0 | D | |
| Restricted Stock Units | (6) | (6) | Common Stock | 730 | $0 | D | |
| Explanation of Responses: |
| 1. The options were granted on February 14, 2024. The option vested as to 25% of the shares on February 14, 2025. The remainder of the shares will vest in 12 equal quarterly installments thereafter. |
| 2. The options were granted on February 7, 2025. The option vested as to 25% of the shares on February 7, 2026. The remainder of the shares will vest in 12 equal quarterly installments thereafter. |
| 3. The stock options are fully vested. |
| 4. The options were granted on February 12, 2024. The option vested as to 25% of the shares on February 3, 2024. The remainder of the shares will vest in 12 equal quarterly installments thereafter. |
| 5. The restricted stock units were granted on February 3, 2023. The restricted stock units vested as to 25% of the shares on February 15, 2024. The remainder of the shares will vest in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date. |
| 6. The restricted stock units were granted on February 14, 2024. The restricted stock units vested as to 25% of the shares on February 15, 2025. The remainder of the shares will vest in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date. |
| Remarks: |
| EVP and Chief Operating Officer Exhibit 24 - Power of Attorney. |
| /s/ Thomas J. DesRosier, Attorney-in-Fact for Kelly M. Brady | 03/11/2026 | |
| ** 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 5 (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. | ||