DESROSIER THOMAS

PrivateCIK: 1435744
Location

LEXINGTON, MA

DESROSIER THOMAS (See Remarks) sold 1.1% of their position (79.00 shares) of SERES THERAPEUTICS, INC. on the open market

Open‑market sale worth $575.12 — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale
InsiderDESROSIER THOMASCIK 1435744
IssuerSERES THERAPEUTICS, INC.CIK 1609809
Officer· See Remarks
Since Mar 2026
-79.00
Net shares
Net seller
$575.12
Total sold
1
Open market trades
0B · 1S
5
Total transactions
244.00 acquired · 323.00 disposed
Non-Derivative Transactions3

Common Stock

Direct
M · Option Exercise

Shares

+133.00

Price / share

Trade value

% of position

1.9%
5/15/2025
7.12K7.25K

Common Stock

Direct
M · Option Exercise

Shares

+111.00

Price / share

Trade value

% of position

1.5%
5/15/2025
7.25K7.37K

Common Stock

Direct
S · Sale

Shares

79.00

Price / share

$7.28

Trade value

$575.12

% of position

1.1%
5/15/2025
7.37K7.29K
Total

Net shares

+165.00

Net value

-$575.12

Derivative Transactions2

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

133.00 shares

Shares

133.00

Strike price

Held after

929.00

Exercisable

5/15/2025

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

111.00 shares

Shares

111.00

Strike price

Held after

1.22K

Exercisable

5/15/2025
DESROSIER THOMAS — Insider Transaction (Form 4) Filed May 19, 2025 | Finecho