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Seres Therapeutics, Inc. (MCRB) XNAS PHARMACEUTICAL PREPARATIONS Net insider selling (90d)
Latest MCRB Insider Trades
About Seres Therapeutics, Inc. (MCRB) Seres Therapeutics Inc is a clinical-stage biotechnology company focused on the development of live biotherapeutic candidates. Its pipeline includes candidates such as SER-155 and SER-603, aimed at preventing and treating bacterial infections, antimicrobial resistance, and gastrointestinal immune diseases. The company operates as a single reportable segment, mainly developing microbiome-based therapies targeting bacterial infections, antimicrobial resistance, and gastrointestinal immune diseases.
Headquarters CAMBRIDGE, MA
Employees 66
Listed 2015
Exchange XNAS https://www.serestherapeutics.com SEC filings for MCRB on EDGAR
90-Day SEC Filing Activity Form 4 transaction type Transactions Shares Total value Open-market sale 4 490 $2K Grant or award 15 176,774 Option exercise 12 2,772
MCRB Insider Transactions (Form 4) 60 56 Form 4 filings on record, the earliest from Oct 29, 2024, newest first. Filing history page 1 of 2.
Date Insider Transaction Security Shares Price Value Aug 15, 2026 KB Kelly Brady - Officer Option exercise Common Stock
Recent MCRB Form 8-K Filings 5
Recent MCRB Form 144 Notices of Proposed Sale 1 A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
Filed Filer Relationship Shares Market value Notice May 19, 2026 - - - - View on EDGAR
MCRB Insider Trading - FAQ
What is the latest insider trade for MCRB? Seres Therapeutics, Inc. (MCRB) had 19 insider filings in the last 90 days, with the most recent on 2026-08-18. The full record for MCRB runs to 56 Form 4 filings, the earliest from 2024-10-29. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
How many insiders are buying MCRB stock? No insider purchases of MCRB were filed in the last 90 days.
How many insiders are selling MCRB stock? 4 insider sales of MCRB were filed in the last 90 days, totaling $2K.
Where can I see MCRB SEC filings (Form 4, 10-K, 10-Q, 8-K)? This page tracks MCRB Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
How can I follow MCRB insider buys? Create a free InsiderAlpha account and press Watch on this page to add MCRB to your watchlist. A free account also opens the full scored daily plan with every past day and 3 months of price history. No card is required. Sign up at https://insideralpha.ai/register.
More Health Care Companies with Insider Activity Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
Related Companies - Recent Insider Activity What is SEC Form 4? The filing insiders must submit within two business days of a trade, and how to read its transaction codes. Track MCRB insider activity as it files Real-time Form 4 alerts, AI-scored daily trade ideas and 10b5-1 plan flags.
Sign up free KB Kelly Brady - Officer Open-market sale $444
May 18, 2026
Market cap $51.33M
P/E ratio -
Dividend yield -
Average volume 90.8K
52 week high $29.98
52 week low $4.32
Today's high $5.14
Today's low $4.80
Open $4.92
Volume 32.5K
Previous close $4.95
Shares outstanding 10.04M Market cap
$51.33M
66 employees
MCRB Insider Sentiment - Last 90 Days Share of open-market insider dollar volume that was buying versus selling, from SEC Form 4 filings.
0% Buying 100% Selling
0 insider purchases totaling $0 against 4 sales totaling $2K.
Most-Active MCRB Insiders - Last 90 Days 10 Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
Aug 17, 2026 KB Kelly Brady - Officer Open-market sale Common Stock 64 $4.55 $291
Aug 15, 2026 KB Kelly Brady - Officer Option exercise Restricted Stock Units 90 $0.00 -
Aug 15, 2026 KB Kelly Brady - Officer Option exercise Restricted Stock Units 91 $0.00 -
Aug 15, 2026 ES Eric D. Shaff - Director Option exercise Common Stock 722 - -
Aug 17, 2026 ES Eric D. Shaff - Director Open-market sale Common Stock 263 $4.55 $1K
Aug 15, 2026 ES Eric D. Shaff - Director Option exercise Restricted Stock Units 390 $0.00 -
Aug 15, 2026 ES Eric D. Shaff - Director Option exercise Restricted Stock Units 332 $0.00 -
Aug 17, 2026 MH Matthew R. Henn - Officer Open-market sale Common Stock 81 $4.55 $369
Aug 15, 2026 MH Matthew R. Henn - Officer Option exercise Restricted Stock Units 140 $0.00 -
Aug 15, 2026 MH Matthew R. Henn - Officer Option exercise Restricted Stock Units 98 $0.00 -
Aug 15, 2026 TD Thomas Desrosier - Officer Option exercise Restricted Stock Units 133 $0.00 -
Aug 15, 2026 TD Thomas Desrosier - Officer Option exercise Restricted Stock Units 112 $0.00 -
Jul 8, 2026 KG Kurt Graves Grant or award Stock Option (right to buy) 6,500 $0.00 -
Jul 8, 2026 RK Richard N. Kender - Officer Grant or award Stock Option (right to buy) 50,000 $0.00 -
Jul 8, 2026 MH Matthew R. Henn - Officer Grant or award Stock Option (right to buy) 25,000 $0.00 -
Jul 8, 2026 MT Marella Thorell - Officer Grant or award Stock Option (right to buy) 7,500 $0.00 -
Jul 8, 2026 CF Claire Fraser Grant or award Stock Option (right to buy) 6,500 $0.00 -
Jul 8, 2026 WD Willard H. Dere Grant or award Stock Option (right to buy) 6,500 $0.00 -
Jul 8, 2026 ES Eric D. Shaff Grant or award Stock Option (right to buy) 6,500 $0.00 -
Jul 8, 2026 SB Stephen Berenson Grant or award Stock Option (right to buy) 6,500 $0.00 -
Jul 8, 2026 TD Thomas Desrosier - Officer Grant or award Stock Option (right to buy) 7,500 $0.00 -
Jul 8, 2026 KB Kelly Brady - Officer Grant or award Stock Option (right to buy) 18,750 $0.00 -
Jul 1, 2026 SB Stephen Berenson Grant or award Stock Option (right to buy) 7,508 $0.00 -
May 15, 2026 TD Thomas Desrosier - Officer Option exercise Restricted Stock Units 133 $0.00 -
May 15, 2026 TD Thomas Desrosier - Officer Option exercise Restricted Stock Units 111 $0.00 -
May 18, 2026 ES Eric D. Shaff Open-market sale Common Stock 259 $7.53 $2K
May 15, 2026 ES Eric D. Shaff Option exercise Restricted Stock Units 391 $0.00 -
May 15, 2026 ES Eric D. Shaff Option exercise Restricted Stock Units 331 $0.00 -
May 15, 2026 KB Kelly Brady - Officer Option exercise Common Stock 180 - -
May 18, 2026 KB Kelly Brady - Officer Open-market sale Common Stock 59 $7.53 $444
May 15, 2026 KB Kelly Brady - Officer Option exercise Restricted Stock Units 89 $0.00 -
May 15, 2026 KB Kelly Brady - Officer Option exercise Restricted Stock Units 91 $0.00 -
May 18, 2026 MH Matthew R. Henn - Officer Open-market sale Common Stock 77 $7.53 $580
May 15, 2026 MH Matthew R. Henn - Officer Option exercise Restricted Stock Units 141 $0.00 -
May 15, 2026 MH Matthew R. Henn - Officer Option exercise Restricted Stock Units 97 $0.00 -
Mar 4, 2026 KB Kelly Brady - Officer Grant or award Stock Option (right to buy) 56,250 $0.00 -
Mar 4, 2026 RK Richard N. Kender - Officer Grant or award Stock Option (right to buy) 150,000 $0.00 -
Mar 4, 2026 MH Matthew R. Henn - Officer Grant or award Stock Option (right to buy) 75,000 $0.00 -
Mar 4, 2026 MT Marella Thorell - Officer Grant or award Stock Option (right to buy) 22,500 $0.00 -
Mar 4, 2026 TD Thomas Desrosier - Officer Grant or award Stock Option (right to buy) 22,500 $0.00 -
Feb 15, 2026 ES Eric D. Shaff Open-market sale Common Stock 259 $8.47 $2K
Feb 15, 2026 ES Eric D. Shaff Option exercise Restricted Stock Units 391 $0.00 -
Feb 15, 2026 ES Eric D. Shaff Option exercise Restricted Stock Units 333 $0.00 -
Feb 15, 2026 TY Teresa L. Young - Officer Open-market sale Common Stock 75 $8.47 $635
Feb 15, 2026 TY Teresa L. Young - Officer Option exercise Restricted Stock Units 133 $0.00 -
Feb 15, 2026 TY Teresa L. Young - Officer Option exercise Restricted Stock Units 98 $0.00 -
$CORT
CORCEPT THERAPEUTICS INC
Kelly Brady - OfficerOpen-market sale$291
