Eric D. Shaff Seres Therapeutics, Inc. (MCRB) insider trading activity

Eric D. Shaff is of Seres Therapeutics, Inc.. Currently has a direct ownership of 11,113 shares of MCRB, which is worth approximately $197,922. The most recent transaction as insider was on Nov 15, 2025, when has been sold 217 shares (Common Stock) at a price of $17.3 per share, resulting in proceeds of $3,754. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 11.1K

4.75% 3M change

93.48% 12M change

Total Value Held $197,922

Eric D. Shaff Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Nov 15 2025	SELL Open market or private sale	$3,754 $17.3 p/Share	217 Reduced 1.92%	11,113 Common Stock
Nov 15 2025	BUY Exercise of conversion of derivative security	-	721 Added 5.98%	11,330 Common Stock
Aug 18 2025	SELL Open market or private sale	$3,613 $16.65 p/Share	217 Reduced 2.0%	10,609 Common Stock
Aug 15 2025	BUY Exercise of conversion of derivative security	-	724 Added 6.27%	10,826 Common Stock
May 16 2025	SELL Open market or private sale	$1,601 $7.28 p/Share	220 Reduced 2.13%	10,102 Common Stock
May 15 2025	BUY Exercise of conversion of derivative security	-	721 Added 6.53%	10,322 Common Stock
Feb 18 2025	SELL Open market or private sale	$10,308 $0.81 p/Share	12,726 Reduced 6.21%	192,039 Common Stock

Feb 15 2025	BUY Exercise of conversion of derivative security	-	34,376 Added 14.37%	204,765 Common Stock
Nov 18 2024	SELL Open market or private sale	$1,352 $0.54 p/Share	2,505 Reduced 1.45%	170,389 Common Stock
Nov 15 2024	BUY Exercise of conversion of derivative security	-	7,812 Added 4.32%	172,894 Common Stock
Oct 28 2024	SELL Open market or private sale	$6,036 $0.69 p/Share	8,748 Reduced 5.03%	165,082 Common Stock
Oct 27 2024	BUY Exercise of conversion of derivative security	-	27,837 Added 13.8%	173,830 Common Stock
Aug 16 2024	SELL Open market or private sale	$2,115 $0.84 p/Share	2,518 Reduced 1.7%	145,993 Common Stock
Aug 15 2024	BUY Exercise of conversion of derivative security	-	7,813 Added 5.0%	148,511 Common Stock
May 15 2024	SELL Open market or private sale	$2,288 $0.94 p/Share	2,435 Reduced 1.7%	140,698 Common Stock
May 15 2024	BUY Exercise of conversion of derivative security	-	7,812 Added 5.18%	143,133 Common Stock
Feb 16 2024	SELL Open market or private sale	$12,472 $1.08 p/Share	11,549 Reduced 7.86%	135,321 Common Stock
Feb 15 2024	BUY Exercise of conversion of derivative security	-	31,250 Added 17.54%	146,870 Common Stock
Oct 30 2023	SELL Open market or private sale	$11,545 $1.35 p/Share	8,552 Reduced 6.89%	115,620 Common Stock
Oct 27 2023	BUY Exercise of conversion of derivative security	-	27,838 Added 18.31%	124,172 Common Stock
Jul 05 2022	BUY Grant, award, or other acquisition	$200,000 $3.15 p/Share	63,492 Added 39.73%	96,334 Common Stock

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Sigilon Therapeutics, Inc. Healthcare

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Eric D. Shaff

Cambridge, MA

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