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Seres Therapeutics, Inc.

MCRB
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001609809

In the last 90 days, Seres Therapeutics, Inc. insiders filed 0 open-market purchases and 4 sales; 35 institutions reported holding it in 13F filings for Q2 2026, worth $17.9M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Seres Therapeutics, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
4 filings
4 insiders, $2.23K in total
Insiders trading
4
Net value
−$2.23K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Seres Therapeutics, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Seres Therapeutics, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Brady KellySee Remarks8,679Aug 18, 20264
Shaff Eric D.Director12,499Aug 18, 20265
Henn Matthew R.See Remarks7,995Aug 18, 20267
DesRosier ThomasSee Remarks8,117Aug 18, 20266
Graves KurtDirector–Jul 10, 20261
Kender Richard NSee Remarks63,492Jul 10, 20262
Thorell MarellaSee Remarks–Jul 10, 20262
Fraser ClaireDirector–Jul 10, 20261
Dere Willard HDirector31,746Jul 10, 20261
Ausiello Dennis ADirector–Jul 10, 20262
Rosiello Robert L.Director–Jul 10, 20262
Berenson StephenDirector–Jul 10, 20262
Young Teresa L.See Remarks8,557Feb 18, 20263
Biondi PaulDirector47,619Apr 11, 20250
von Moltke LisaSee Remarks39,875Feb 19, 20250
Woerle Hans-JuergenDirector–Feb 6, 20250
Ege David S.See Remarks77,575Aug 19, 20240
Arkowitz DavidChief Financial Officer182,442Feb 16, 20240
Cloghessy PaulaSee Remarks45,684Oct 31, 20230
Behar GregoryDirector–Jun 23, 20230
Afeyan Noubar10% Owner5,825,495IndirectJul 7, 20220
Flagship Pioneering, LLC10% Owner5,825,495IndirectJul 7, 20220
Nutritional Health LTP Fund General Partner LLC10% Owner5,825,495IndirectJul 7, 20220
Nutritional Health LTP Fund, L.P.10% Owner5,825,495IndirectJul 7, 20220
Zausner MerylDirector31,746Jul 6, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Aug 18, 2026 (view filing)5:33 PM ETAug 171 dayBrady KellySee RemarksSSale−64$4.55−$291.2−0.7%8.68K after10b5-1
Aug 18, 2026 (view filing)5:27 PM ETAug 171 dayShaff Eric D.DirectorSSale−263$4.55−$1.20K−2.1%12.5K after10b5-1
Aug 18, 2026 (view filing)5:25 PM ETAug 171 dayHenn Matthew R.See RemarksSSale−81$4.55−$368.55−1.0%8.00K after10b5-1
Aug 18, 2026 (view filing)5:22 PM ETAug 171 dayDesRosier ThomasSee RemarksSSale−82$4.55−$373.1−1.0%8.12K after10b5-1
May 19, 2026 (view filing)May 181 dayShaff Eric D.DirectorSSale−259$7.53−$1.95K−2.1%12.0K after10b5-1
May 19, 2026 (view filing)May 181 dayBrady KellySee RemarksSSale−59$7.53−$444.27−0.7%8.56K after
May 19, 2026 (view filing)May 181 dayDesRosier ThomasSee RemarksSSale−79$7.53−$594.87−1.0%7.95K after10b5-1
May 19, 2026 (view filing)May 181 dayHenn Matthew R.See RemarksSSale−77$7.53−$579.81−1.0%7.84K after10b5-1
Feb 18, 2026 (view filing)Feb 153 daysYoung Teresa L.See RemarksSSale−75$8.47−$635.25−0.9%8.56K after10b5-1
Feb 18, 2026 (view filing)Feb 153 daysShaff Eric D.DirectorSSale−259$8.47−$2.19K−2.2%11.6K after10b5-1
Feb 18, 2026 (view filing)Feb 153 daysDesRosier ThomasSee RemarksSSale−78$8.47−$660.66−1.0%7.79K after10b5-1
Feb 18, 2026 (view filing)Feb 153 daysHenn Matthew R.See RemarksSSale−89$8.47−$753.83−1.1%7.68K after10b5-1
Nov 18, 2025 (view filing)Nov 153 daysDesRosier ThomasSee RemarksSSale−76$17.30−$1.31K−1.0%7.62K after10b5-1
Nov 18, 2025 (view filing)Nov 153 daysYoung Teresa L.See RemarksSSale−1.04K$17.30−$18.0K−11.0%8.40K after10b5-1
Nov 18, 2025 (view filing)Nov 153 daysShaff Eric D.DirectorSSale−217$17.30−$3.75K−1.9%11.1K after10b5-1
Nov 18, 2025 (view filing)Nov 153 daysHenn Matthew R.See RemarksSSale−1.26K$17.30−$21.7K−14.3%7.53K after10b5-1
Aug 19, 2025 (view filing)Aug 181 dayDesRosier ThomasSee RemarksSSale−76$16.65−$1.27K−1.0%7.46K after10b5-1
Aug 19, 2025 (view filing)Aug 181 dayYoung Teresa L.See RemarksSSale−59$16.65−$982.35−1.1%5.21K after10b5-1
Aug 19, 2025 (view filing)Aug 181 dayShaff Eric D.DirectorSSale−217$16.65−$3.61K−2.0%10.6K after10b5-1
Aug 19, 2025 (view filing)Aug 181 dayHenn Matthew R.See RemarksSSale−73$16.65−$1.22K−1.6%4.55K after10b5-1
May 19, 2025 (view filing)May 163 daysYoung Teresa L.See RemarksSSale−63$7.28−$458.64−1.2%5.04K after10b5-1
May 19, 2025 (view filing)May 163 daysShaff Eric D.CEO and PresidentSSale−220$7.28−$1.60K−2.1%10.1K after10b5-1
May 19, 2025 (view filing)May 154 daysDesRosier ThomasChief Legal Officer and EVPSSale−79$7.28−$575.12−1.1%7.29K after10b5-1
May 19, 2025 (view filing)May 163 daysHenn Matthew R.See RemarksSSale−77$7.28−$560.56−1.7%4.38K after10b5-1
Feb 19, 2025 (view filing)Feb 181 dayYoung Teresa L.See RemarksSSale−3.34K$0.81−$2.70K−3.3%97.5K after10b5-1
Feb 19, 2025 (view filing)Feb 181 dayHenn Matthew R.See RemarksSSale−3.95K$0.81−$3.20K−4.5%84.4K after10b5-1
Feb 19, 2025 (view filing)Feb 181 dayShaff Eric D.CEO and PresidentSSale−12.7K$0.81−$10.3K−6.2%192.0K after10b5-1
Feb 19, 2025 (view filing)Feb 181 dayDesRosier ThomasChief Legal Officer and EVPSSale−4.30K$0.81−$3.48K−2.9%142.5K after10b5-1
Feb 19, 2025 (view filing)Feb 181 dayvon Moltke LisaSee RemarksSSale−4.42K$0.81−$3.58K−10.0%39.9K after10b5-1
Nov 19, 2024 (view filing)Nov 181 dayDesRosier ThomasChief Legal Officer and EVPSSale−878$0.54−$474.12−0.6%135.2K after10b5-1
Nov 19, 2024 (view filing)Nov 181 dayvon Moltke LisaSee RemarksSSale−977$0.54−$527.58−2.9%32.4K after10b5-1
Nov 19, 2024 (view filing)Nov 181 dayYoung Teresa L.See RemarksSSale−735$0.54−$396.9−0.8%90.4K after10b5-1
Nov 19, 2024 (view filing)Nov 181 dayHenn Matthew R.See RemarksSSale−927$0.54−$500.58−1.2%77.8K after10b5-1
Nov 19, 2024 (view filing)Nov 181 dayShaff Eric D.CEO and PresidentSSale−2.50K$0.54−$1.35K−1.4%170.4K after10b5-1
Oct 29, 2024 (view filing)Oct 281 dayvon Moltke LisaSee RemarksSSale−4.33K$0.69−$2.99K−12.5%30.4K after10b5-1
Oct 29, 2024 (view filing)Oct 281 dayHenn Matthew R.See RemarksSSale−3.98K$0.69−$2.75K−5.0%75.9K after10b5-1
Oct 29, 2024 (view filing)Oct 281 dayDesRosier ThomasChief Legal Officer and EVPSSale−4.26K$0.69−$2.94K−3.1%133.4K after10b5-1
Oct 29, 2024 (view filing)Oct 281 dayShaff Eric D.CEO and PresidentSSale−8.75K$0.69−$6.04K−5.0%165.1K after10b5-1
Oct 29, 2024 (view filing)Oct 281 dayYoung Teresa L.See RemarksSSale−2.98K$0.69−$2.06K−3.3%88.5K after10b5-1
Aug 19, 2024 (view filing)Aug 163 daysDesRosier ThomasChief Legal Officer and EVPSSale−873$0.84−$733.32−0.7%124.2K after10b5-1
Aug 19, 2024 (view filing)Aug 163 daysvon Moltke LisaSee RemarksSSale−973$0.84−$817.32−4.4%21.0K after10b5-1
Aug 19, 2024 (view filing)Aug 163 daysHenn Matthew R.See RemarksSSale−923$0.84−$775.32−1.4%67.2K after10b5-1
Aug 19, 2024 (view filing)Aug 163 daysShaff Eric D.CEO and PresidentSSale−2.52K$0.84−$2.12K−1.7%146.0K after10b5-1
Aug 19, 2024 (view filing)Aug 163 daysYoung Teresa L.See RemarksSSale−728$0.84−$611.52−0.9%80.1K after10b5-1
Aug 19, 2024 (view filing)Aug 163 daysEge David S.See RemarksSSale−1.13K$0.84−$947.52−1.4%77.6K after10b5-1
Aug 6, 2024 (view filing)Aug 51 dayYoung Teresa L.See RemarksSSale−24.5K$1.08−$26.4K−23.8%78.2K after10b5-1
May 17, 2024 (view filing)May 152 daysvon Moltke LisaSee RemarksSSale−939$0.94−$882.66−4.7%19.0K after10b5-1
May 17, 2024 (view filing)May 152 daysShaff Eric D.CEO and PresidentSSale−2.44K$0.94−$2.29K−1.7%140.7K after10b5-1
May 17, 2024 (view filing)May 152 daysYoung Teresa L.See RemarksSSale−703$0.94−$660.82−3.8%17.7K after10b5-1
May 17, 2024 (view filing)May 152 daysHenn Matthew R.See RemarksSSale−891$0.94−$837.54−1.3%65.4K after10b5-1