Arkolith/Insider Trading/MCRB

MCRB Insider Trading

Seres Therapeutics, Inc. · full profile →Last filing Mar 4, 2026
Net Selling · 180d
Open-Market Buys (180d)
$0
0 insiders
Open-Market Sells (180d)
$4K
4 insiders
Net Insider Flow
-$4K
open market, 180d
Reporting Insiders
4
4 P/S transactions
Build

Build on these Form 4 transactions

The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.

Form 4 insider API

Open-market buys and sells, cluster scans, company flows.

insider.transactions

13F holdings API

Owners, holdings, deltas, point-in-time portfolios.

stock.owners

MCP quickstart

Connect an agent, mint a key, make the first call.

/api/mcp

Recent Form 4 Transactions

100 shown
DateInsiderRoleActionSharesPriceValue
Mar 4, 2026Brady KellySee RemarksGrant(A)56K—$0
Mar 4, 2026DesRosier ThomasSee RemarksGrant(A)23K—$0
Mar 4, 2026Thorell MarellaSee RemarksGrant(A)23K—$0
Mar 4, 2026Henn Matthew RSee RemarksGrant(A)75K—$0
Mar 4, 2026Kender Richard NSee Remarks, DirectorGrant(A)150K—$0
Feb 15, 2026Henn Matthew RSee RemarksOption exercise(M)239——
Feb 15, 2026Henn Matthew RSee RemarksSell(S)89$8.47$754
Feb 15, 2026Henn Matthew RSee RemarksOption exercise(M)141—$0
Feb 15, 2026Henn Matthew RSee RemarksOption exercise(M)98—$0
Feb 15, 2026DesRosier ThomasSee RemarksSell(S)78$8.47$661
Feb 15, 2026DesRosier ThomasSee RemarksOption exercise(M)244——
Feb 15, 2026DesRosier ThomasSee RemarksOption exercise(M)133—$0
Feb 15, 2026DesRosier ThomasSee RemarksOption exercise(M)111—$0
Feb 15, 2026Shaff Eric D.DirectorOption exercise(M)723——
Feb 15, 2026Shaff Eric D.DirectorSell(S)259$8.47$2K
Feb 15, 2026Shaff Eric D.DirectorOption exercise(M)391—$0
Feb 15, 2026Shaff Eric D.DirectorOption exercise(M)333—$0
Feb 15, 2026Young Teresa L.See RemarksOption exercise(M)231——
Feb 15, 2026Young Teresa L.See RemarksSell(S)75$8.47$635
Feb 15, 2026Young Teresa L.See RemarksOption exercise(M)98—$0
Feb 15, 2026Young Teresa L.See RemarksOption exercise(M)133—$0
Nov 15, 2025Henn Matthew RSee RemarksSell(S)1K$17.30$22K
Nov 15, 2025Henn Matthew RSee RemarksOption exercise(M)98——
Nov 15, 2025Henn Matthew RSee RemarksOption exercise(M)4K——
Nov 15, 2025Henn Matthew RSee RemarksOption exercise(M)140——
Nov 15, 2025Henn Matthew RSee RemarksOption exercise(M)4K—$0
Nov 15, 2025Henn Matthew RSee RemarksOption exercise(M)140—$0
Nov 15, 2025Henn Matthew RSee RemarksOption exercise(M)98—$0
Nov 15, 2025Shaff Eric D.DirectorSell(S)217$17.30$4K
Nov 15, 2025Shaff Eric D.DirectorOption exercise(M)331——
Nov 15, 2025Shaff Eric D.DirectorOption exercise(M)390——
Nov 15, 2025Shaff Eric D.DirectorOption exercise(M)331—$0
Nov 15, 2025Shaff Eric D.DirectorOption exercise(M)390—$0
Nov 15, 2025Young Teresa L.See RemarksSell(S)1K$17.30$18K
Nov 15, 2025Young Teresa L.See RemarksOption exercise(M)4K——
Nov 15, 2025Young Teresa L.See RemarksOption exercise(M)98——
Nov 15, 2025Young Teresa L.See RemarksOption exercise(M)132——
Nov 15, 2025Young Teresa L.See RemarksOption exercise(M)132—$0
Nov 15, 2025Young Teresa L.See RemarksOption exercise(M)98—$0
Nov 15, 2025Young Teresa L.See RemarksOption exercise(M)4K—$0
Nov 15, 2025DesRosier ThomasSee RemarksOption exercise(M)132——
Nov 15, 2025DesRosier ThomasSee RemarksOption exercise(M)112——
Nov 15, 2025DesRosier ThomasSee RemarksSell(S)76$17.30$1K
Nov 15, 2025DesRosier ThomasSee RemarksOption exercise(M)112—$0
Nov 15, 2025DesRosier ThomasSee RemarksOption exercise(M)132—$0
Sep 26, 2025Henn Matthew RSee RemarksGrant(A)4K—$0
Sep 26, 2025Young Teresa L.See RemarksGrant(A)4K—$0
Aug 18, 2025Henn Matthew RSee RemarksSell(S)73$16.65$1K
Aug 18, 2025Shaff Eric D.DirectorSell(S)217$16.65$4K
Aug 18, 2025Young Teresa L.See RemarksSell(S)59$16.65$982
Aug 18, 2025DesRosier ThomasSee RemarksSell(S)76$16.65$1K
Aug 15, 2025Henn Matthew RSee RemarksOption exercise(M)97——
Aug 15, 2025Henn Matthew RSee RemarksOption exercise(M)141——
Aug 15, 2025Henn Matthew RSee RemarksOption exercise(M)97—$0
Aug 15, 2025Henn Matthew RSee RemarksOption exercise(M)141—$0
Aug 15, 2025Shaff Eric D.DirectorOption exercise(M)333——
Aug 15, 2025Shaff Eric D.DirectorOption exercise(M)391——
Aug 15, 2025Shaff Eric D.DirectorOption exercise(M)333—$0
Aug 15, 2025Shaff Eric D.DirectorOption exercise(M)391—$0
Aug 15, 2025Young Teresa L.See RemarksOption exercise(M)133——
Aug 15, 2025Young Teresa L.See RemarksOption exercise(M)97——
Aug 15, 2025Young Teresa L.See RemarksOption exercise(M)97—$0
Aug 15, 2025Young Teresa L.See RemarksOption exercise(M)133—$0
Aug 15, 2025DesRosier ThomasSee RemarksOption exercise(M)111——
Aug 15, 2025DesRosier ThomasSee RemarksOption exercise(M)133——
Aug 15, 2025DesRosier ThomasSee RemarksOption exercise(M)111—$0
Aug 15, 2025DesRosier ThomasSee RemarksOption exercise(M)133—$0
Aug 5, 2025Rosiello Robert L.DirectorGrant(A)10K—$0
Jul 1, 2025Fraser ClaireDirectorGrant(A)6K—$0
Jul 1, 2025Berenson StephenDirectorGrant(A)11K—$0
Jul 1, 2025Ausiello Dennis ADirectorGrant(A)6K—$0
May 16, 2025Henn Matthew RSee RemarksSell(S)77$7.28$561
May 16, 2025Shaff Eric D.CEO and President, DirectorSell(S)220$7.28$2K
May 16, 2025Young Teresa L.See RemarksSell(S)63$7.28$459
May 15, 2025Henn Matthew RSee RemarksOption exercise(M)140——
May 15, 2025Henn Matthew RSee RemarksOption exercise(M)98——
May 15, 2025Henn Matthew RSee RemarksOption exercise(M)140—$0
May 15, 2025Henn Matthew RSee RemarksOption exercise(M)98—$0
May 15, 2025DesRosier ThomasChief Legal Officer and EVPSell(S)79$7.28$575
May 15, 2025DesRosier ThomasChief Legal Officer and EVPOption exercise(M)133——
May 15, 2025DesRosier ThomasChief Legal Officer and EVPOption exercise(M)111——
May 15, 2025DesRosier ThomasChief Legal Officer and EVPOption exercise(M)111—$0
May 15, 2025DesRosier ThomasChief Legal Officer and EVPOption exercise(M)133—$0
May 15, 2025Shaff Eric D.CEO and President, DirectorOption exercise(M)390——
May 15, 2025Shaff Eric D.CEO and President, DirectorOption exercise(M)331——
May 15, 2025Shaff Eric D.CEO and President, DirectorOption exercise(M)331—$0
May 15, 2025Shaff Eric D.CEO and President, DirectorOption exercise(M)390—$0
May 15, 2025Young Teresa L.See RemarksOption exercise(M)133——
May 15, 2025Young Teresa L.See RemarksOption exercise(M)98——
May 15, 2025Young Teresa L.See RemarksOption exercise(M)133—$0
May 15, 2025Young Teresa L.See RemarksOption exercise(M)98—$0
Apr 10, 2025Dere Willard HDirectorGrant(A)100K—$0
Apr 10, 2025Ausiello Dennis ADirectorGrant(A)100K—$0
Apr 10, 2025Kender Richard NDirectorGrant(A)100K—$0
Apr 10, 2025Berenson StephenDirectorGrant(A)100K—$0
Apr 10, 2025Graves KurtDirectorGrant(A)100K—$0
Apr 10, 2025Fraser ClaireDirectorGrant(A)100K—$0
Apr 10, 2025Biondi PaulDirectorGrant(A)100K—$0
Feb 18, 2025von Moltke LisaSee RemarksSell(S)4K$0.81$4K
Feb 18, 2025DesRosier ThomasChief Legal Officer and EVPSell(S)4K$0.81$3K

Data Source

Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.

Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).