SHAFF ERIC D.

PrivateCIK: 1643734
Location

CAMBRIDGE, MA

SHAFF ERIC D. (See Remarks) sold 2.0% of their position (217.00 shares) of SERES THERAPEUTICS, INC. on the open market

Open‑market sale worth $3.6K — 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
$3.6K
Total sold
1
Open market trades
0B · 1S
5
Total transactions
724.00 acquired · 941.00 disposed
Non-Derivative Transactions3

Common Stock

Direct
M · Option Exercise

Shares

+391.00

Price / share

Trade value

% of position

3.9%
8/15/2025
10.10K10.49K

Common Stock

Direct
M · Option Exercise

Shares

+333.00

Price / share

Trade value

% of position

3.2%
8/15/2025
10.49K10.83K

Common Stock

Direct
S · Sale

Shares

217.00

Price / share

$16.65

Trade value

$3.61K

% of position

2.0%
8/18/2025
10.83K10.61K
Total

Net shares

+507.00

Net value

-$3.61K

Derivative Transactions2

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

391.00 shares

Shares

391.00

Strike price

Held after

2.34K

Exercisable

8/15/2025

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

333.00 shares

Shares

333.00

Strike price

Held after

3.32K

Exercisable

8/15/2025
SHAFF ERIC D. — Insider Transaction (Form 4) Filed Aug 19, 2025 | Finecho