SHAFF ERIC D.

PrivateCIK: 1643734
Location

CAMBRIDGE, MA

SHAFF ERIC D. (See Remarks) sold 1.9% of their position (217.00 shares) of SERES THERAPEUTICS, INC. on the open market

Open‑market sale worth $3.8K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale
InsiderSHAFF ERIC D.CIK 1643734
IssuerSERES THERAPEUTICS, INC.CIK 1609809
Officer· See Remarks
Since Jan 2019
-217.00
Net shares
Net seller
$3.8K
Total sold
1
Open market trades
0B · 1S
5
Total transactions
721.00 acquired · 938.00 disposed
Non-Derivative Transactions3

Common Stock

Direct
M · Option Exercise

Shares

+390.00

Price / share

Trade value

% of position

3.7%
11/15/2025
10.61K11K

Common Stock

Direct
M · Option Exercise

Shares

+331.00

Price / share

Trade value

% of position

3.0%
11/15/2025
11K11.33K

Common Stock

Direct
S · Sale

Shares

217.00

Price / share

$17.30

Trade value

$3.75K

% of position

1.9%
11/15/2025
11.33K11.11K
Total

Net shares

+504.00

Net value

-$3.75K

Derivative Transactions2

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

390.00 shares

Shares

390.00

Strike price

Held after

1.95K

Exercisable

11/15/2025

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

331.00 shares

Shares

331.00

Strike price

Held after

2.99K

Exercisable

11/15/2025
SHAFF ERIC D. — Insider Transaction (Form 4) Filed Nov 18, 2025 | Finecho