Thomas J. DesRosier - 04 Mar 2026 Form 4 Insider Report for Seres Therapeutics, Inc. (MCRB)

Role
EVP and Chief Legal Officer
Signature
/s/ Thomas J. DesRosier
Issuer symbol
MCRB
Transactions as of
04 Mar 2026
Net transactions value
$0
Form type
4
Filing time
06 Mar 2026, 16:31:52 UTC
Previous filing
18 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
DesRosier Thomas EVP and Chief Legal Officer C/O SERES THERAPEUTICS, INC., 101 CAMBRIDGE PARK DRIVE, CAMBRIDGE /s/ Thomas J. DesRosier 06 Mar 2026 0001435744

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MCRB Stock Option (right to buy) Award +22,500 $0.000000* 22,500 04 Mar 2026 Common Stock 22,500 $9.13 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The option will vest as to 25% of the shares on March 2, 2027. The remainder of the shares will vest in 12 equal quarterly installments thereafter.

Remarks:

EVP and Chief Legal Officer