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Seres Therapeutics, Inc.

MCRB
Healthcare|Biotechnology|US
$1.98
-0.11 (-5.26%)
Tangible Book / Share
$2.14
Cash / Share
$1.76

Ownership Breakdown

76.4%
Float
9.9M
Shares Outstanding
7.6M
Float Shares

Major Holders (2)

Combined: 6.2%

Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.

HolderType% of ClassSharesFiledFiling
FMR LLCHolding company3.10%268,704Aug 6, 202513D/G
Abigail P. JohnsonIndividual3.10%268,704Aug 6, 202513D/G

Insider Trades (100)

Last 4 quarters: 516,660 acquired · 17,694 disposed
InsiderPositionDateTypeSharesPriceValueFiling
Brady KellySee RemarksAug 15, 2026OPTION EX.181——Form 4
Brady KellySee RemarksAug 17, 2026SELL64$4.55$291.20Form 4
Brady KellySee RemarksAug 15, 2026OPTION EX.91——Form 4
Brady KellySee RemarksAug 15, 2026OPTION EX.90——Form 4
Shaff Eric D.directorAug 15, 2026OPTION EX.722——Form 4
Shaff Eric D.directorAug 17, 2026SELL263$4.55$1.2KForm 4
Shaff Eric D.directorAug 15, 2026OPTION EX.332——Form 4
Shaff Eric D.directorAug 15, 2026OPTION EX.390——Form 4
Henn Matthew RSee RemarksAug 15, 2026OPTION EX.238——Form 4
Henn Matthew RSee RemarksAug 17, 2026SELL81$4.55$368.55Form 4
Henn Matthew RSee RemarksAug 15, 2026OPTION EX.98——Form 4
Henn Matthew RSee RemarksAug 15, 2026OPTION EX.140——Form 4
DesRosier ThomasSee RemarksAug 15, 2026OPTION EX.245——Form 4
DesRosier ThomasSee RemarksAug 17, 2026SELL82$4.55$373.10Form 4
DesRosier ThomasSee RemarksAug 15, 2026OPTION EX.112——Form 4
DesRosier ThomasSee RemarksAug 15, 2026OPTION EX.133——Form 4
Graves KurtdirectorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Kender Richard Ndirector, officer: See RemarksJul 8, 2026AWARD50,000$9.13$456.5KForm 4
Henn Matthew RSee RemarksJul 8, 2026AWARD25,000$9.13$228.3KForm 4
Thorell MarellaSee RemarksJul 8, 2026AWARD7,500$9.13$68.5KForm 4
Fraser ClairedirectorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Dere Willard HdirectorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Ausiello Dennis AdirectorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Shaff Eric D.directorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Rosiello Robert L.directorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Berenson StephendirectorJul 8, 2026AWARD6,500$7.14$46.4KForm 4
Brady KellySee RemarksJul 8, 2026AWARD18,750$9.13$171.2KForm 4
DesRosier ThomasSee RemarksJul 8, 2026AWARD7,500$9.13$68.5KForm 4
Berenson StephendirectorJul 1, 2026AWARD7,508$7.94$59.6KForm 4
Rosiello Robert L.directorJul 1, 2026AWARD7,508$7.94$59.6KForm 4
Ausiello Dennis AdirectorJul 1, 2026AWARD7,508$7.94$59.6KForm 4
Shaff Eric D.directorMay 15, 2026OPTION EX.722——Form 4
Shaff Eric D.directorMay 18, 2026SELL259$7.53$2.0KForm 4
DesRosier ThomasSee RemarksMay 15, 2026OPTION EX.244——Form 4
DesRosier ThomasSee RemarksMay 18, 2026SELL79$7.53$594.87Form 4
Shaff Eric D.directorMay 15, 2026OPTION EX.331——Form 4
Shaff Eric D.directorMay 15, 2026OPTION EX.391——Form 4
DesRosier ThomasSee RemarksMay 15, 2026OPTION EX.111——Form 4
DesRosier ThomasSee RemarksMay 15, 2026OPTION EX.133——Form 4
Brady KellySee RemarksMay 15, 2026OPTION EX.180——Form 4
Brady KellySee RemarksMay 18, 2026SELL59$7.53$444.27Form 4
Henn Matthew RSee RemarksMay 15, 2026OPTION EX.238——Form 4
Henn Matthew RSee RemarksMay 18, 2026SELL77$7.53$579.81Form 4
Henn Matthew RSee RemarksMay 15, 2026OPTION EX.97——Form 4
Brady KellySee RemarksMay 15, 2026OPTION EX.91——Form 4
Henn Matthew RSee RemarksMay 15, 2026OPTION EX.141——Form 4
Brady KellySee RemarksMay 15, 2026OPTION EX.89——Form 4
Brady KellySee RemarksMar 4, 2026AWARD56,250$9.13$513.6KForm 4
Brady KellySee RemarksMar 2, 2026OTHER0——Form 4
Brady KellySee RemarksMar 2, 2026OTHER2,925$22.00$64.3KForm 4
Brady KellySee RemarksMar 2, 2026OTHER11,700$15.64$183.0KForm 4
Brady KellySee RemarksMar 2, 2026OTHER1,430$23.00$32.9KForm 4
Brady KellySee RemarksMar 2, 2026OTHER730——Form 4
Kender Richard Ndirector, officer: See RemarksMar 4, 2026AWARD150,000$9.13$1.4MForm 4
Henn Matthew RSee RemarksMar 4, 2026AWARD75,000$9.13$684.8KForm 4
Thorell MarellaSee RemarksMar 4, 2026AWARD22,500$9.13$205.4KForm 4
DesRosier ThomasSee RemarksMar 4, 2026AWARD22,500$9.13$205.4KForm 4
Shaff Eric D.directorFeb 15, 2026OPTION EX.723——Form 4
Shaff Eric D.directorFeb 15, 2026SELL259$8.47$2.2KForm 4
Shaff Eric D.directorFeb 15, 2026OPTION EX.333——Form 4
Shaff Eric D.directorFeb 15, 2026OPTION EX.391——Form 4
Young Teresa L.See RemarksFeb 15, 2026OPTION EX.231——Form 4
Young Teresa L.See RemarksFeb 15, 2026SELL75$8.47$635.25Form 4
Young Teresa L.See RemarksFeb 15, 2026OPTION EX.98——Form 4
Young Teresa L.See RemarksFeb 15, 2026OPTION EX.133——Form 4
DesRosier ThomasSee RemarksFeb 15, 2026OPTION EX.244——Form 4
DesRosier ThomasSee RemarksFeb 15, 2026SELL78$8.47$660.66Form 4
DesRosier ThomasSee RemarksFeb 15, 2026OPTION EX.111——Form 4
DesRosier ThomasSee RemarksFeb 15, 2026OPTION EX.133——Form 4
Henn Matthew RSee RemarksFeb 15, 2026OPTION EX.239——Form 4
Henn Matthew RSee RemarksFeb 15, 2026SELL89$8.47$753.83Form 4
Henn Matthew RSee RemarksFeb 15, 2026OPTION EX.98——Form 4
Henn Matthew RSee RemarksFeb 15, 2026OPTION EX.141——Form 4
Young Teresa L.See RemarksNov 15, 2025OPTION EX.98——Form 4
Young Teresa L.See RemarksNov 15, 2025OPTION EX.132——Form 4
Young Teresa L.See RemarksNov 15, 2025OPTION EX.3,998——Form 4
Young Teresa L.See RemarksNov 15, 2025SELL1,042$17.30$18.0KForm 4
Young Teresa L.See RemarksNov 15, 2025OPTION EX.98——Form 4
Young Teresa L.See RemarksNov 15, 2025OPTION EX.132——Form 4
Young Teresa L.See RemarksNov 15, 2025OPTION EX.3,998——Form 4
Shaff Eric D.directorNov 15, 2025OPTION EX.331——Form 4
Shaff Eric D.directorNov 15, 2025SELL217$17.30$3.8KForm 4
Shaff Eric D.directorNov 15, 2025OPTION EX.390——Form 4
Shaff Eric D.directorNov 15, 2025OPTION EX.331——Form 4
Shaff Eric D.directorNov 15, 2025OPTION EX.390——Form 4
DesRosier ThomasSee RemarksNov 15, 2025OPTION EX.112——Form 4
DesRosier ThomasSee RemarksNov 15, 2025SELL76$17.30$1.3KForm 4
DesRosier ThomasSee RemarksNov 15, 2025OPTION EX.132——Form 4
DesRosier ThomasSee RemarksNov 15, 2025OPTION EX.112——Form 4
DesRosier ThomasSee RemarksNov 15, 2025OPTION EX.132——Form 4
Henn Matthew RSee RemarksNov 15, 2025OPTION EX.98——Form 4
Henn Matthew RSee RemarksNov 15, 2025OPTION EX.140——Form 4
Henn Matthew RSee RemarksNov 15, 2025OPTION EX.3,998——Form 4
Henn Matthew RSee RemarksNov 15, 2025SELL1,257$17.30$21.7KForm 4
Henn Matthew RSee RemarksNov 15, 2025OPTION EX.98——Form 4
Henn Matthew RSee RemarksNov 15, 2025OPTION EX.140——Form 4
Henn Matthew RSee RemarksNov 15, 2025OPTION EX.3,998——Form 4
Young Teresa L.See RemarksSep 26, 2025AWARD3,998——Form 4
Henn Matthew RSee RemarksSep 26, 2025AWARD3,998——Form 4
Shaff Eric D.directorAug 15, 2025OPTION EX.333——Form 4