SHAFF ERIC D.

PrivateCIK: 1643734
Location

CAMBRIDGE, MA

SHAFF ERIC D. (See Remarks) sold 2.1% of their position (220.00 shares) of SERES THERAPEUTICS, INC. on the open market

Open‑market sale worth $1.6K — 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
-220.00
Net shares
Net seller
$1.6K
Total sold
1
Open market trades
0B · 1S
5
Total transactions
721.00 acquired · 941.00 disposed
Non-Derivative Transactions3

Common Stock

Direct
M · Option Exercise

Shares

+390.00

Price / share

Trade value

% of position

4.1%
5/15/2025
9.60K9.99K

Common Stock

Direct
M · Option Exercise

Shares

+331.00

Price / share

Trade value

% of position

3.3%
5/15/2025
9.99K10.32K

Common Stock

Direct
S · Sale

Shares

220.00

Price / share

$7.28

Trade value

$1.60K

% of position

2.1%
5/16/2025
10.32K10.10K
Total

Net shares

+501.00

Net value

-$1.60K

Derivative Transactions2

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

390.00 shares

Shares

390.00

Strike price

Held after

2.73K

Exercisable

5/15/2025

Restricted Stock Units

Direct
M · Option Exercise
Converts to

Common Stock

331.00 shares

Shares

331.00

Strike price

Held after

3.65K

Exercisable

5/15/2025
SHAFF ERIC D. — Insider Transaction (Form 4) Filed May 19, 2025 | Finecho