HENN MATTHEW R

PrivateCIK: 1767321
Location

CAMBRIDGE, MA

HENN MATTHEW R (Chief Scientific Officer) sold 1.0% of their position (77.00 shares) of SERES THERAPEUTICS, INC. on the open market

Open‑market sale worth $579.81 — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale
InsiderHENN MATTHEW RCIK 1767321
IssuerSERES THERAPEUTICS, INC.CIK 1609809
Officer· Chief Scientific Officer
Since Feb 2019
-77.00
Net shares
Net seller
$579.81
Total sold
1
Open market trades
0B · 1S
4
Total transactions
238.00 acquired · 315.00 disposed
Non-Derivative Transactions2

Common Stock

Direct
M · Option Exercise

Shares

+238.00

Price / share

Trade value

% of position

3.1%
5/15/2026
7.68K7.92K

Common Stock

Direct
S · Sale

Shares

77.00

Price / share

$7.53

Trade value

$579.81

% of position

1.0%
5/18/2026
7.92K7.84K
Total

Net shares

+161.00

Net value

-$579.81

Derivative Transactions2

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

141.00 shares

Shares

141.00

Strike price

Held after

422.00

Exercisable

5/15/2026

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

97.00 shares

Shares

97.00

Strike price

Held after

683.00

Exercisable

5/15/2026
HENN MATTHEW R — Insider Transaction (Form 4) Filed May 19, 2026 | Finecho