Seres Therapeutics, Inc. Insider Trading

MCRB

Last 12 months

Insiders sold 55K and bought nothing on the open market.

99% of the selling was scheduled in advance under 10b5-1 plans. The last open-market buy by an executive or director was in Jun 2019.

Net open-market

−55K

0 buys · 16 sales

Under a 10b5-1 plan

99%

of the value sold

Insiders who bought / sold

0 / 5

executives and directors

Last open-market buy

Jun 2019

Jun 18, 2019

Get an email when MCRB's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 17	Kelly Brady See Remarks	Sold10b5-1 plan	64	$4.55	$291	0.7%	Form 4
Aug 17	Eric D. Shaff Director	Sold10b5-1 plan	263	$4.55	1K	2.1%	Form 4
Aug 17	Matthew R Henn See Remarks	Sold10b5-1 plan	81	$4.55	$369	1.0%	Form 4
Aug 17	Thomas Desrosier See Remarks	Sold10b5-1 plan	82	$4.55	$373	1.0%	Form 4
May 18	Eric D. Shaff Director	Sold10b5-1 plan	259	$7.53	2K	2.1%	Form 4
May 18	Kelly Brady See Remarks	SoldNo plan	59	$7.53	$444	0.7%	Form 4
May 18	Thomas Desrosier See Remarks	Sold10b5-1 plan	79	$7.53	$595	1.0%	Form 4
May 18	Matthew R Henn See Remarks	Sold10b5-1 plan	77	$7.53	$580	1.0%	Form 4
Feb 15	Teresa L. Young See Remarks	Sold10b5-1 plan	75	$8.47	$635	0.9%	Form 4
Feb 15	Eric D. Shaff Director	Sold10b5-1 plan	259	$8.47	2K	2.2%	Form 4
Feb 15	Thomas Desrosier See Remarks	Sold10b5-1 plan	78	$8.47	$661	1.0%	Form 4
Feb 15	Matthew R Henn See Remarks	Sold10b5-1 plan	89	$8.47	$754	1.1%	Form 4
Nov 15, 2025	Thomas Desrosier See Remarks	Sold10b5-1 plan	76	$17.30	1K	1.0%	Form 4
Nov 15, 2025	Teresa L. Young See Remarks	Sold10b5-1 plan	1,042	$17.30	18K	11%	Form 4
Nov 15, 2025	Eric D. Shaff Director	Sold10b5-1 plan	217	$17.30	4K	1.9%	Form 4
Nov 15, 2025	Matthew R Henn See Remarks	Sold10b5-1 plan	1,257	$17.30	22K	14%	Form 4
Aug 18, 2025	Thomas Desrosier See Remarks	Sold10b5-1 plan	76	$16.65	1K	1.0%	Form 4
Aug 18, 2025	Teresa L. Young See Remarks	Sold10b5-1 plan	59	$16.65	$982	1.1%	Form 4
Aug 18, 2025	Eric D. Shaff Director	Sold10b5-1 plan	217	$16.65	4K	2.0%	Form 4
Aug 18, 2025	Matthew R Henn See Remarks	Sold10b5-1 plan	73	$16.65	1K	1.6%	Form 4
May 16, 2025	Teresa L. Young See Remarks	Sold10b5-1 plan	63	$7.28	$459	1.2%	Form 4
May 16, 2025	Eric D. Shaff CEO and President	Sold10b5-1 plan	220	$7.28	2K	2.1%	Form 4
May 16, 2025	Matthew R Henn See Remarks	Sold10b5-1 plan	77	$7.28	$561	1.7%	Form 4
May 15, 2025	Thomas Desrosier Chief Legal Officer and EVP	Sold10b5-1 plan	79	$7.28	$575	1.1%	Form 4
Feb 18, 2025	Teresa L. Young See Remarks	Sold10b5-1 plan	3,338	$0.81	3K	3.3%	Form 4
Feb 18, 2025	Matthew R. Henn See Remarks	Sold10b5-1 plan	3,953	$0.81	3K	4.5%	Form 4
Feb 18, 2025	Eric D. Shaff CEO and President	Sold10b5-1 plan	12,726	$0.81	10K	6.2%	Form 4
Feb 18, 2025	Thomas Desrosier Chief Legal Officer and EVP	Sold10b5-1 plan	4,300	$0.81	3K	2.9%	Form 4
Feb 18, 2025	Lisa Von Moltke See Remarks	Sold10b5-1 plan	4,416	$0.81	4K	10.0%	Form 4
Nov 18, 2024	Thomas Desrosier Chief Legal Officer and EVP	Sold10b5-1 plan	878	$0.54	$474	0.6%	Form 4
Nov 18, 2024	Lisa Von Moltke See Remarks	Sold10b5-1 plan	977	$0.54	$528	2.9%	Form 4
Nov 18, 2024	Teresa L. Young See Remarks	Sold10b5-1 plan	735	$0.54	$397	0.8%	Form 4
Nov 18, 2024	Matthew R. Henn See Remarks	Sold10b5-1 plan	927	$0.54	$501	1.2%	Form 4
Nov 18, 2024	Eric D. Shaff CEO and President	Sold10b5-1 plan	2,505	$0.54	1K	1.4%	Form 4

Aug 1710b5-1 plan
Kelly Brady
See Remarks · sold 64 at $4.55
$291
0.7% of stake
Aug 1710b5-1 plan
Eric D. Shaff
Director · sold 263 at $4.55
1K
2.1% of stake
Aug 1710b5-1 plan
Matthew R Henn
See Remarks · sold 81 at $4.55
$369
1.0% of stake
Aug 1710b5-1 plan
Thomas Desrosier
See Remarks · sold 82 at $4.55
$373
1.0% of stake
May 1810b5-1 plan
Eric D. Shaff
Director · sold 259 at $7.53
2K
2.1% of stake
May 18No plan
Kelly Brady
See Remarks · sold 59 at $7.53
$444
0.7% of stake
May 1810b5-1 plan
Thomas Desrosier
See Remarks · sold 79 at $7.53
$595
1.0% of stake
May 1810b5-1 plan
Matthew R Henn
See Remarks · sold 77 at $7.53
$580
1.0% of stake
Feb 1510b5-1 plan
Teresa L. Young
See Remarks · sold 75 at $8.47
$635
0.9% of stake
Feb 1510b5-1 plan
Eric D. Shaff
Director · sold 259 at $8.47
2K
2.2% of stake
Feb 1510b5-1 plan
Thomas Desrosier
See Remarks · sold 78 at $8.47
$661
1.0% of stake
Feb 1510b5-1 plan
Matthew R Henn
See Remarks · sold 89 at $8.47
$754
1.1% of stake
Nov 15, 202510b5-1 plan
Thomas Desrosier
See Remarks · sold 76 at $17.30
1K
1.0% of stake
Nov 15, 202510b5-1 plan
Teresa L. Young
See Remarks · sold 1,042 at $17.30
18K
11% of stake
Nov 15, 202510b5-1 plan
Eric D. Shaff
Director · sold 217 at $17.30
4K
1.9% of stake
Nov 15, 202510b5-1 plan
Matthew R Henn
See Remarks · sold 1,257 at $17.30
22K
14% of stake
Aug 18, 202510b5-1 plan
Thomas Desrosier
See Remarks · sold 76 at $16.65
1K
1.0% of stake
Aug 18, 202510b5-1 plan
Teresa L. Young
See Remarks · sold 59 at $16.65
$982
1.1% of stake
Aug 18, 202510b5-1 plan
Eric D. Shaff
Director · sold 217 at $16.65
4K
2.0% of stake
Aug 18, 202510b5-1 plan
Matthew R Henn
See Remarks · sold 73 at $16.65
1K
1.6% of stake
May 16, 202510b5-1 plan
Teresa L. Young
See Remarks · sold 63 at $7.28
$459
1.2% of stake
May 16, 202510b5-1 plan
Eric D. Shaff
CEO and President · sold 220 at $7.28
2K
2.1% of stake
May 16, 202510b5-1 plan
Matthew R Henn
See Remarks · sold 77 at $7.28
$561
1.7% of stake
May 15, 202510b5-1 plan
Thomas Desrosier
Chief Legal Officer and EVP · sold 79 at $7.28
$575
1.1% of stake
Feb 18, 202510b5-1 plan
Teresa L. Young
See Remarks · sold 3,338 at $0.81
3K
3.3% of stake
Feb 18, 202510b5-1 plan
Matthew R. Henn
See Remarks · sold 3,953 at $0.81
3K
4.5% of stake
Feb 18, 202510b5-1 plan
Eric D. Shaff
CEO and President · sold 12,726 at $0.81
10K
6.2% of stake
Feb 18, 202510b5-1 plan
Thomas Desrosier
Chief Legal Officer and EVP · sold 4,300 at $0.81
3K
2.9% of stake
Feb 18, 202510b5-1 plan
Lisa Von Moltke
See Remarks · sold 4,416 at $0.81
4K
10.0% of stake
Nov 18, 202410b5-1 plan
Thomas Desrosier
Chief Legal Officer and EVP · sold 878 at $0.54
$474
0.6% of stake
Nov 18, 202410b5-1 plan
Lisa Von Moltke
See Remarks · sold 977 at $0.54
$528
2.9% of stake
Nov 18, 202410b5-1 plan
Teresa L. Young
See Remarks · sold 735 at $0.54
$397
0.8% of stake
Nov 18, 202410b5-1 plan
Matthew R. Henn
See Remarks · sold 927 at $0.54
$501
1.2% of stake
Nov 18, 202410b5-1 plan
Eric D. Shaff
CEO and President · sold 2,505 at $0.54
1K
1.4% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch MCRB, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Held by ETFs

MCRB is in 2 US ETFs. The largest of them, with MCRB's weight in each:

Spot a number that looks wrong? Check it in MCRB's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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