Velarion · Company Intelligence
Compensation Brief
Fiscal year 2025 · Filings through 2026-08-18

Seres Therapeutics, Inc. (MCRB)

Former CEO Marella Thorell was paid $1,113,396 in fiscal year 2025, the 1st percentile of its disclosed peer group (SEC filing 0001193125-26-182036 ↗): executive and director compensation, incentive-plan design, equity activity, and governance — every figure in this brief is traceable to its exact location in the company’s SEC filing — the document, the section, the page, and the table, linked directly.

$1,775,549
Eric Shaff total, FY2025
Former President and Chief Executive Officer — highest-paid officer; CEO Marella Thorell: $1,113,396
1st
CEO (Marella Thorell) pay percentile vs peers
—
CEO-to-median pay ratio
84.47%
Say-on-pay support, latest vote

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MCRB's next annual pay disclosure, estimated June 11, 2027.est. Filing ↗

01

Summary Compensation Table — fiscal year 2025

Named executive officerSalaryBonusStock awardsOption awardsNon-equity incentivePension / NQDCAll otherTotal
Eric Shaff$408,333$0$0$1,338,870$0$0$28,346$1,775,549
Former President and Chief Executive Officer
Thomas DesRosier512,900166,6670446,2900010,1661,136,023
Former Co-President and Co-Chief Executive Officer and current Executive Vice President and Chief Legal Officer
Marella Thorell494,400166,667—446,290006,0391,113,396
Former Co-President and Co-Chief Executive Officer and current Executive Vice President and Chief Financial Officer
Teresa Young489,300075,682446,2900010,1901,021,462
Former Executive Vice President and Chief Commercial and Strategy Officer
Matthew Henn489,300075,682446,290003,0751,014,347
President and Chief Scientific Officer

A dash means the company reported no figure in that column; 0 means it reported zero. Figures are as printed in the filing, without adjustment.

Three-year trend — total compensation per named executive

Named executive officerFY2025 totalFY2024 totalFY2023 totalΔ FY2024→2025
Eric Shaff$1,775,549$2,682,007$3,158,336↓ −906,458
Thomas DesRosier1,136,0231,248,507—↓ −112,484
Marella Thorell1,113,396———
Teresa Young1,021,462—1,820,458—
Matthew Henn1,014,347———

Prior-year totals as disclosed in the corresponding proxy; deltas are computed values with the derivation shown in the register.

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$1,775,549 Eric Shaff total, FY2025

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Data as of August 18, 2026 · Source: 0001193125-26-182036 · Velarion Executive Compensation Database, deposited on Zenodo (doi:10.5281/zenodo.22283855).

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01b

Executives — the named officers

One page per officer: the same table above, read for one person at a time — his own figure and every fiscal year the register holds.

ExecutiveRoleFY2025 total
Eric ShaffCEO$1,775,549
Marella ThorellCEO$1,113,396
Matthew HennPresident$1,014,347
Teresa YoungEVP$1,021,462
Thomas DesRosierCEO$1,136,023
01c

Board of directors

One page per director: the seat, the committees and the fee table, read for one person at a time.

DirectorRoleFY2025 total
Claire M. Fraser, Ph.DIndependent Director$151,688
Dennis A. Ausiello, M.DIndependent Director$131,688
Hans-Juergen Woerle, M.D., Ph.DIndependent Director$132,362
Kurt C. GravesIndependent Director$88,375
Paul R. BiondiFormer director (through FY2025)$82,261
Richard N. KenderChair of the Board$123,375
Robert RosielloIndependent Director$147,115
Stephen A. BerensonIndependent Director$168,985
Willard H. Dere, M.DIndependent Director$113,375
02

Equity transactions since the proxy statement was filed

Every insider equity transaction reported on Form 4 after the 2025 proxy statement — acquisitions, dispositions, exercises, and withholdings — and therefore not reflected in any table in that document.

InsiderRoleTransaction dateCodeSharesPriceValueSecuritySource
Matthew HennSee Remarks2026-05-15A238——CommonForm 4 ↗
Dividend-equivalent accruals2026-05-15—1,384——4 insiders, 8 accrual rows
Thomas DesRosierSee Remarks2026-05-15A244——CommonForm 4 ↗
Eric D. ShaffDirector2026-05-15A722——CommonForm 4 ↗
Kelly BradySee Remarks2026-05-15A180——CommonForm 4 ↗
Kelly BradySee Remarks2026-05-18D598444CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-05-18D798595CommonForm 4 ↗
Matthew HennSee Remarks2026-05-18D778580CommonForm 4 ↗
Eric D. ShaffDirector2026-05-18D25981,950CommonForm 4 ↗
Dennis A. AusielloDirector2026-07-01A7,50800Derivative, Class A CommonForm 4 ↗
Robert RosielloDirector2026-07-01A7,50800Derivative, Class A CommonForm 4 ↗
Stephen A. BerensonDirector2026-07-01A7,50800Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-07-08A18,75000Derivative, Class A CommonForm 4 ↗
Robert RosielloDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Willard H. DereDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Marella ThorellSee Remarks2026-07-08A7,50000Derivative, Class A CommonForm 4 ↗
Claire FraserDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Kurt C. GravesDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Eric D. ShaffDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Richard N. KenderDirector2026-07-08A50,00000Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-07-08A25,00000Derivative, Class A CommonForm 4 ↗
Stephen A. BerensonDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Dennis A. AusielloDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-07-08A7,50000Derivative, Class A CommonForm 4 ↗
Dividend-equivalent accruals2026-08-15—1,386——4 insiders, 8 accrual rows
Thomas DesRosierSee Remarks2026-08-15A245——CommonForm 4 ↗
Kelly BradySee Remarks2026-08-15A181——CommonForm 4 ↗
Matthew HennSee Remarks2026-08-15A238——CommonForm 4 ↗
Eric D. ShaffDirector2026-08-15A722——CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-08-17D825373CommonForm 4 ↗
Matthew HennSee Remarks2026-08-17D815369CommonForm 4 ↗
Kelly BradySee Remarks2026-08-17D645291CommonForm 4 ↗
Eric D. ShaffDirector2026-08-17D26351,197CommonForm 4 ↗

Transaction codes per Form 4: A acquisition · S open-market sale · F tax withholding · M option exercise · G gift. Value = shares × price as reported. Dividend-equivalent and fractional-share accrual rows (derivative Class A, under $10,000 and under 2,000 shares) are aggregated per date; every row appears in full below.

View all 47 transactions
InsiderRoleTransaction dateCodeSharesPriceValueSecuritySource
Matthew HennSee Remarks2026-05-15A238——CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-05-15D13300Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-05-15A244——CommonForm 4 ↗
Eric D. ShaffDirector2026-05-15D33100Derivative, Class A CommonForm 4 ↗
Eric D. ShaffDirector2026-05-15D39100Derivative, Class A CommonForm 4 ↗
Eric D. ShaffDirector2026-05-15A722——CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-05-15D11100Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-05-15D9700Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-05-15D14100Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-05-15D9100Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-05-15D8900Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-05-15A180——CommonForm 4 ↗
Kelly BradySee Remarks2026-05-18D598444CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-05-18D798595CommonForm 4 ↗
Matthew HennSee Remarks2026-05-18D778580CommonForm 4 ↗
Eric D. ShaffDirector2026-05-18D25981,950CommonForm 4 ↗
Dennis A. AusielloDirector2026-07-01A7,50800Derivative, Class A CommonForm 4 ↗
Robert RosielloDirector2026-07-01A7,50800Derivative, Class A CommonForm 4 ↗
Stephen A. BerensonDirector2026-07-01A7,50800Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-07-08A18,75000Derivative, Class A CommonForm 4 ↗
Robert RosielloDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Willard H. DereDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Marella ThorellSee Remarks2026-07-08A7,50000Derivative, Class A CommonForm 4 ↗
Claire FraserDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Kurt C. GravesDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Eric D. ShaffDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Richard N. KenderDirector2026-07-08A50,00000Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-07-08A25,00000Derivative, Class A CommonForm 4 ↗
Stephen A. BerensonDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Dennis A. AusielloDirector2026-07-08A6,50000Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-07-08A7,50000Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-08-15D11200Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-08-15D13300Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-08-15A245——CommonForm 4 ↗
Eric D. ShaffDirector2026-08-15D33200Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-08-15D9000Derivative, Class A CommonForm 4 ↗
Kelly BradySee Remarks2026-08-15A181——CommonForm 4 ↗
Eric D. ShaffDirector2026-08-15D39000Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-08-15D9800Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-08-15D14000Derivative, Class A CommonForm 4 ↗
Matthew HennSee Remarks2026-08-15A238——CommonForm 4 ↗
Eric D. ShaffDirector2026-08-15A722——CommonForm 4 ↗
Kelly BradySee Remarks2026-08-15D9100Derivative, Class A CommonForm 4 ↗
Thomas DesRosierSee Remarks2026-08-17D825373CommonForm 4 ↗
Matthew HennSee Remarks2026-08-17D815369CommonForm 4 ↗
Kelly BradySee Remarks2026-08-17D645291CommonForm 4 ↗
Eric D. ShaffDirector2026-08-17D26351,197CommonForm 4 ↗
03

Grants of plan-based awards — fiscal year 2025

ExecutiveAwardGrant dateThresholdTargetGrantedMaximumGrant-date fair value
Teresa YoungOPTION2025-02-07——32,500—$446,290
Thomas DesRosierOPTION2025-02-07——32,500—446,290
Teresa YoungRSU2025-09-26——3,998—75,682
Matthew HennOPTION2025-02-07——32,500—446,290
Matthew HennRSU2025-09-26——3,998—75,682
Eric ShaffOPTION2025-02-07——97,500—1,338,870
Marella ThorellOPTION2025-02-07——32,500—446,290
03b

Vehicle mix — grant-date fair value by award type

Named executive officerTime-vested (RSU)Performance-vested (PSU)Options / SARs% performance-vested
Teresa Young$75,682$0$446,2900.0%
Thomas DesRosier00446,2900.0%
Matthew Henn75,6820446,2900.0%
Eric Shaff001,338,8700.0%
Marella Thorell00446,2900.0%

% performance-vested = PSU grant-date fair value ÷ (RSU + PSU + Options), a computed value with the derivation shown in the register.

04

Outstanding equity awards at fiscal year-end 2025

ExecutiveAwardShares unvestedExercise priceMarket value unvested
Thomas DesRosierOption1,329110—
Teresa YoungOption1,329110—
Eric ShaffRSU2,989—44,476
Thomas DesRosierRSU1,001—14,895
Thomas DesRosierOption6,01222—
Marella ThorellOption32,50015.64—
Eric ShaffOption1,563147.6—
Matthew HennOption547147.6—
Thomas DesRosierOption32,50015.64—
Marella ThorellOption19,68815.75—
Teresa YoungOption32,50015.64—
Eric ShaffOption17,93022—
Eric ShaffOption41,12922—
Eric ShaffRSU1,954—29,076
Matthew HennOption1,407110—
Teresa YoungOption5,27422—
Matthew HennOption32,50015.64—
Matthew HennRSU878—13,065
Teresa YoungRSU878—13,065
Teresa YoungRSU664—9,880
Thomas DesRosierRSU664—9,880
Thomas DesRosierOption14,39522—
Thomas DesRosierOption407147.6—
Matthew HennOption14,39522—
Matthew HennOption5,27422—
Teresa YoungOption14,39522—
Matthew HennRSU704—10,476
Eric ShaffOption97,50015.64—
Eric ShaffOption3,907110—
Teresa YoungOption375147.6—
05

Incentive-plan design — the Compensation Discussion & Analysis

Our executive compensation program has been designed to motivate, reward, attract and retain high caliber management deemed essential to ensure our success. The program seeks to align executive compensation with our short- and long-term objectives, business strategy and financial performance.

CEO STI target (% of salary)60%
CEO LTI target (% of salary)—
Independent consultantAlpine Rewards, LLC
Clawback policyTrue
Anti-hedgingTrue
Anti-pledgingTrue
06

Say-on-pay — recent advisory votes

Meeting yearMeeting dateForAgainstAbstainSupportOutcome
20262026-07-083,374,813620,353121,29584.47%Passed
20252025-04-1057,856,00432,505,142405,64564.03%Passed
20232023-06-2291,849,150560,885156,60499.39%Passed
20222022-06-2270,250,3851,086,657129,11698.48%Passed
20212021-06-1673,748,370446,095106,69199.4%Passed

Rows are labeled by annual-meeting year, with the meeting date beside each; the vote held in a given year acts on the prior fiscal year's compensation.

Say-on-pay — history, company's computation

Meeting yearMeeting dateApproval — company's computation
20262026-07-0884.47%a
20252025-04-1064.03%b
20232023-06-2299.39%c

a. Approved under the standard stated in the filing — “Abstentions will have no effect.”.

b. Approved under the standard stated in the filing — “Abstentions and broker non-votes are not considered to be votes cast and, accordingly, will have no effect on the outcome of the vote on this Proposal.”.

c. Approved under the standard stated in the filing — “Abstentions and broker non-votes are not considered to be votes cast and, accordingly, will have no effect on the outcome of the vote on this proposal.”.

Approval percentages are the company's own reported computations under its own stated standard, not recomputed by Velarion. Where a company does not state a standard, none is assumed.

07

CEO pay ratio

Ratio (CEO : median employee)—
CEO total compensation—
Median employee compensation—
08

Director compensation — fiscal year 2025

DirectorCash feesStock awardsOption awardsNon-equity incentiveAll otherTotal
Stephen A. BerensonIndependent · Audit · Nominating and Corporate Governance (Chair)$10,000$0$158,985$0$0$168,985
Claire M. Fraser, Ph.DIndependent · Audit · Nominating and Corporate Governance40,0000111,68800151,688
Robert RosielloIndependent · Compensation and Talent · Newly elected21,2570125,85800147,115
Hans-Juergen Woerle, M.D., Ph.DIndependent · Science and Clinical Development · Newly elected47,486084,87600132,362
Dennis A. Ausiello, M.DIndependent · Audit · Science and Clinical Development (Chair)20,0000111,68800131,688
Richard N. KenderEmployee director · Board Chair72,500050,875—0123,375
Willard H. Dere, M.DIndependent · Audit (Chair) · Nominating and Corporate Governance62,500050,87500113,375
Kurt C. GravesIndependent · Compensation and Talent (Chair)37,500050,8750088,375
Paul R. BiondiIndependent · Departed during FY31,386050,8750082,261
Eric D. ShaffEmployee director000—00
09

Board fee structure and ownership guideline

Annual cash retainer$45,000
Annual equity retainer—
Per board meeting fee—
Committee chair fees (audit / comp / nom-gov)20,000 / 15,000 / 10,000
Stock ownership guideline—
09b

Total cost of the board

ComponentFY2025
Cash retainers and fees$342,629
Equity awards (grant-date value)$0
All other compensation$0
Total cost of the board$342,629

Computed as the sum of the director compensation table rows above; inputs and formula shown in the register.

10

Disclosed peer group — fiscal year 2025

The compensation peer group as the company disclosed it in its own proxy — the reference set behind the percentile above.

10a

Peer reciprocity

Of the companies Seres Therapeutics, Inc. names as compensation peers, which name it back in their own disclosed peer groups. A peer set the market reciprocates reads differently from one selected in a single direction.

Reciprocity shown where the peer's own current proxy has been read — each mark is cited in the register to that peer's filing. A dash means the peer's current proxy was read and names no reciprocal group including Seres Therapeutics, Inc..

10b

Chief executive pay against the peer group

Most recent fiscal-year chief executive compensation at each disclosed peer, taken from that company's own proxy statement.

RankCompanyFYChief executiveSalaryStock awardsOption awardsNon-equity incentiveTotal
1Aura Biosciences2025Elisabet de los Pinos$645,483$1,492,378$1,513,293$284,013$3,956,167
2Larimar Therapeutics2025Carole Ben-Maimon650,000660,8601,889,16003,526,423
3Atea Pharmaceuticals2025Jean-Pierre Sommadossi703,4901,315,800962,368422,0943,403,752
4Enanta Pharmaceuticals2025Jay Luly803,300128,5501,223,975591,6652,769,548
5Acrivon Therapeutics2025Peter Blume-Jensen709,89301,592,245410,4002,718,538
6Regulus Therapeutics2023Joseph Hagan615,80088,0001,528,091332,5322,575,123
7Voyager Therapeutics2025Alfred Sandrock674,903611,900843,900361,9172,508,370
8Assembly Biosciences2025Jason Okazaki647,500661,671573,574585,0002,482,987
9Black Diamond Therapeutics2025Mark Velleca667,400189,0001,006,030348,7172,234,919
10Mersana Therapeutics2024Michael Huber632,500133,635518,044322,5751,613,754
11Seres Therapeutics, Inc.2025Marella Thorell494,400—446,29001,113,396

Each peer's compensation is from its most recently filed proxy; fiscal years differ by company. Each peer's figures come from its own filings; the subject company is highlighted. Peers whose chief executive compensation is outside our coverage universe are stated as such, never left blank.

10c

Incentive design against the same peers

CompanyAnnual incentive payoutLong-term vehicle mixPSU measures include TSRCompensation consultant
Seres Therapeutics, Inc.not disclosedOptions 100not disclosedAlpine Rewards, LLC
Acrivon Therapeuticsnot disclosedOption 100not disclosednot disclosed
Assembly Biosciencesnot disclosedOptions 100NoAlpine Rewards, LLC
Atea Pharmaceuticalsnot disclosednot disclosednot disclosedAon
Aura Biosciencesnot disclosednot disclosednot disclosedPay Governance
Black Diamond Therapeutics95%not disclosednot disclosedAon Human Capital Solutions (Aon plc)
Enanta Pharmaceuticalsnot disclosedOptions 80 · PSU 10 · MSU 10NoAlpine Rewards LLC
Larimar Therapeuticsnot disclosedOption 75 · RSU 25NoAon
Mersana Therapeuticsnot disclosedOption 75 · RSU 25not disclosedPearl Meyer & Partners, LLC
Regulus Therapeuticsnot disclosednot disclosedNoAon/Radford
Voyager Therapeutics97.5%not disclosedNoAlpine Rewards, LLC

Read from each company's Compensation Discussion and Analysis: annual incentive payout as a percentage of target, the disclosed long-term vehicle mix, whether performance-share measures include a total shareholder return component, and the retained compensation consultant. “Not disclosed” appears only where the company's filing does not state the item.

10d

Frequently asked questions

Who was the highest-paid executive at Seres Therapeutics, Inc. in fiscal 2025?
As disclosed, Eric Shaff (Former President and Chief Executive Officer) was the highest-paid executive at Seres Therapeutics, Inc. in fiscal 2025, with total compensation of $1,775,549.
How does Seres Therapeutics, Inc.'s chief executive pay compare to its disclosed peer group?
As disclosed, Marella Thorell's total compensation ranked at the 1st percentile of Seres Therapeutics, Inc.'s disclosed peer group.
How did shareholders vote on Seres Therapeutics, Inc.'s executive compensation?
As disclosed, 84.47% of shareholders supported Seres Therapeutics, Inc.'s executive compensation in the latest say-on-pay vote.
How much does Seres Therapeutics, Inc. spend in total on board compensation for fiscal 2025?
As disclosed, Seres Therapeutics, Inc. reported total board compensation of $342,629 for fiscal 2025.

Answers are drawn only from the figures disclosed in this brief and cited to their location in the source filing. Where a figure required for an answer is not disclosed, that is stated rather than estimated.

11

Source register

Each figure's location is given both for the eye (section · page · table · row · column) and for a script (table/row/column index and exact character span in the filed document). Any figure can be independently confirmed against the source.

#SupportsDocumentFiledAccessionLocation in document
1Section 01, Eric ShaffDEF 14A2026-04-270001193125-26-182036Section “2025 Summary Compensation Table”. As printed: 1,775,549. Filing ↗machine: r2 · c29 · span 928055–928064
2Section 01, Thomas DesRosierDEF 14A2026-04-270001193125-26-182036Section “2025 Summary Compensation Table”. As printed: 1,136,023. Filing ↗machine: r4 · c29 · span 951675–951684
3Section 01, Marella ThorellDEF 14A2026-04-270001193125-26-182036Section “2025 Summary Compensation Table”. As printed: 1,113,396. Filing ↗machine: r6 · c29 · span 975066–975075
4Section 01, Teresa YoungDEF 14A2026-04-270001193125-26-182036Section “2025 Summary Compensation Table”. As printed: 1,021,462. Filing ↗machine: r10 · c29 · span 1015338–1015347
5Section 01, Matthew HennDEF 14A2026-04-270001193125-26-182036Section “2025 Summary Compensation Table”. As printed: 1,014,347. Filing ↗machine: r8 · c29 · span 995243–995252
6Section 03, Teresa Young OPTIONDEF 14A2026-04-270001193125-26-182036Section “ATTENDANCE BY MEMBERS OF THE BOARD OF DIRECTORS AT MEETINGS” · grants of plan-based awards table. Filing ↗machine: t27 · r10 · c17 · span 1010995–1011002
7Section 03, Thomas DesRosier OPTIONDEF 14A2026-04-270001193125-26-182036Section “ATTENDANCE BY MEMBERS OF THE BOARD OF DIRECTORS AT MEETINGS” · grants of plan-based awards table. Filing ↗machine: t27 · r4 · c17 · span 947032–947039
8Section 03, Teresa Young RSUDEF 14A2026-04-270001193125-26-182036Section “Grants of Plan-Based Awards” · grants of plan-based awards table. Filing ↗machine: t28 · r12 · c13 · span 1100642–1100648
9Section 03, Matthew Henn OPTIONDEF 14A2026-04-270001193125-26-182036Section “ATTENDANCE BY MEMBERS OF THE BOARD OF DIRECTORS AT MEETINGS” · grants of plan-based awards table. Filing ↗machine: t27 · r8 · c17 · span 990901–990908
10Section 03, Matthew Henn RSUDEF 14A2026-04-270001193125-26-182036Section “Grants of Plan-Based Awards” · grants of plan-based awards table. Filing ↗machine: t28 · r9 · c13 · span 1083629–1083635
11Section 03, Eric Shaff OPTIONDEF 14A2026-04-270001193125-26-182036Section “ATTENDANCE BY MEMBERS OF THE BOARD OF DIRECTORS AT MEETINGS” · grants of plan-based awards table. Filing ↗machine: t27 · r2 · c17 · span 923710–923719
12Section 03, Marella Thorell OPTIONDEF 14A2026-04-270001193125-26-182036Section “ATTENDANCE BY MEMBERS OF THE BOARD OF DIRECTORS AT MEETINGS” · grants of plan-based awards table. Filing ↗machine: t27 · r6 · c16 · span 970724–970731
13Section 07, pay ratio10-K2026-03-120001193125-26-103276Section “CEO Pay Ratio”. As printed: —. Filing ↗
14Section 08, Stephen A. BerensonDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 168,985. Filing ↗machine: t35 · r3 · c11 · span 1759743–1759971
15Section 08, Claire M. Fraser, Ph.DDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 151,688. Filing ↗machine: t35 · r6 · c11 · span 1774435–1774663
16Section 08, Robert RosielloDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 147,115. Filing ↗machine: t35 · r9 · c11 · span 1789112–1789340
17Section 08, Hans-Juergen Woerle, M.D., Ph.DDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 132,362. Filing ↗machine: t35 · r10 · c11 · span 1794022–1794250
18Section 08, Dennis A. Ausiello, M.DDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 131,688. Filing ↗machine: t35 · r2 · c11 · span 1754844–1755072
19Section 08, Richard N. KenderDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 123,375. Filing ↗machine: t35 · r8 · c11 · span 1784217–1784445
20Section 08, Willard H. Dere, M.DDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 113,375. Filing ↗machine: t35 · r5 · c11 · span 1769532–1769760
21Section 08, Kurt C. GravesDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 88,375. Filing ↗machine: t35 · r7 · c11 · span 1779325–1779552
22Section 08, Paul R. BiondiDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 82,261. Filing ↗machine: t35 · r4 · c11 · span 1764636–1764863
23Section 08, Eric D. ShaffDEF 14A2026-04-270001193125-26-182036Section “Director Compensation”. As printed: 0. Filing ↗
24Section 02, Matthew Henn 2026-05-15Form 42026-05-190001193125-26-230727Insider equity transaction reported since the proxy statement. Filing ↗
25Section 02, Thomas DesRosier 2026-05-15Form 42026-05-190001193125-26-230728Insider equity transaction reported since the proxy statement. Filing ↗
26Section 02, Thomas DesRosier 2026-05-15Form 42026-05-190001193125-26-230728Insider equity transaction reported since the proxy statement. Filing ↗
27Section 02, Eric D. Shaff 2026-05-15Form 42026-05-190001193125-26-230733Insider equity transaction reported since the proxy statement. Filing ↗
28Section 02, Eric D. Shaff 2026-05-15Form 42026-05-190001193125-26-230733Insider equity transaction reported since the proxy statement. Filing ↗
29Section 02, Eric D. Shaff 2026-05-15Form 42026-05-190001193125-26-230733Insider equity transaction reported since the proxy statement. Filing ↗
30Section 02, Thomas DesRosier 2026-05-15Form 42026-05-190001193125-26-230728Insider equity transaction reported since the proxy statement. Filing ↗
31Section 02, Matthew Henn 2026-05-15Form 42026-05-190001193125-26-230727Insider equity transaction reported since the proxy statement. Filing ↗
32Section 02, Matthew Henn 2026-05-15Form 42026-05-190001193125-26-230727Insider equity transaction reported since the proxy statement. Filing ↗
33Section 02, Kelly Brady 2026-05-15Form 42026-05-190001193125-26-230732Insider equity transaction reported since the proxy statement. Filing ↗
34Section 02, Kelly Brady 2026-05-15Form 42026-05-190001193125-26-230732Insider equity transaction reported since the proxy statement. Filing ↗
35Section 02, Kelly Brady 2026-05-15Form 42026-05-190001193125-26-230732Insider equity transaction reported since the proxy statement. Filing ↗
36Section 02, Kelly Brady 2026-05-18Form 42026-05-190001193125-26-230732Insider equity transaction reported since the proxy statement. Filing ↗
37Section 02, Thomas DesRosier 2026-05-18Form 42026-05-190001193125-26-230728Insider equity transaction reported since the proxy statement. Filing ↗
38Section 02, Matthew Henn 2026-05-18Form 42026-05-190001193125-26-230727Insider equity transaction reported since the proxy statement. Filing ↗
39Section 02, Eric D. Shaff 2026-05-18Form 42026-05-190001193125-26-230733Insider equity transaction reported since the proxy statement. Filing ↗
40Section 02, Dennis A. Ausiello 2026-07-01Form 42026-07-020001193125-26-295059Insider equity transaction reported since the proxy statement. Filing ↗
41Section 02, Robert Rosiello 2026-07-01Form 42026-07-020001193125-26-295064Insider equity transaction reported since the proxy statement. Filing ↗
42Section 02, Stephen A. Berenson 2026-07-01Form 42026-07-020001193125-26-295071Insider equity transaction reported since the proxy statement. Filing ↗
43Section 02, Kelly Brady 2026-07-08Form 42026-07-100001193125-26-300914Insider equity transaction reported since the proxy statement. Filing ↗
44Section 02, Robert Rosiello 2026-07-08Form 42026-07-100001193125-26-300926Insider equity transaction reported since the proxy statement. Filing ↗
45Section 02, Willard H. Dere 2026-07-08Form 42026-07-100001193125-26-300920Insider equity transaction reported since the proxy statement. Filing ↗
46Section 02, Marella Thorell 2026-07-08Form 42026-07-100001193125-26-300922Insider equity transaction reported since the proxy statement. Filing ↗
47Section 02, Claire Fraser 2026-07-08Form 42026-07-100001193125-26-300921Insider equity transaction reported since the proxy statement. Filing ↗
48Section 02, Kurt C. Graves 2026-07-08Form 42026-07-100001193125-26-300927Insider equity transaction reported since the proxy statement. Filing ↗
49Section 02, Eric D. Shaff 2026-07-08Form 42026-07-100001193125-26-300916Insider equity transaction reported since the proxy statement. Filing ↗
50Section 02, Richard N. Kender 2026-07-08Form 42026-07-100001193125-26-300925Insider equity transaction reported since the proxy statement. Filing ↗
51Section 02, Matthew Henn 2026-07-08Form 42026-07-100001193125-26-300923Insider equity transaction reported since the proxy statement. Filing ↗
52Section 02, Stephen A. Berenson 2026-07-08Form 42026-07-100001193125-26-300924Insider equity transaction reported since the proxy statement. Filing ↗
53Section 02, Dennis A. Ausiello 2026-07-08Form 42026-07-100001193125-26-300918Insider equity transaction reported since the proxy statement. Filing ↗
54Section 02, Thomas DesRosier 2026-07-08Form 42026-07-100001193125-26-300919Insider equity transaction reported since the proxy statement. Filing ↗
55Section 02, Thomas DesRosier 2026-08-15Form 42026-08-180001193125-26-355712Insider equity transaction reported since the proxy statement. Filing ↗
56Section 02, Thomas DesRosier 2026-08-15Form 42026-08-180001193125-26-355712Insider equity transaction reported since the proxy statement. Filing ↗
57Section 02, Thomas DesRosier 2026-08-15Form 42026-08-180001193125-26-355712Insider equity transaction reported since the proxy statement. Filing ↗
58Section 02, Eric D. Shaff 2026-08-15Form 42026-08-180001193125-26-355722Insider equity transaction reported since the proxy statement. Filing ↗
59Section 02, Kelly Brady 2026-08-15Form 42026-08-180001193125-26-355734Insider equity transaction reported since the proxy statement. Filing ↗
60Section 02, Kelly Brady 2026-08-15Form 42026-08-180001193125-26-355734Insider equity transaction reported since the proxy statement. Filing ↗
61Section 02, Eric D. Shaff 2026-08-15Form 42026-08-180001193125-26-355722Insider equity transaction reported since the proxy statement. Filing ↗
62Section 02, Matthew Henn 2026-08-15Form 42026-08-180001193125-26-355718Insider equity transaction reported since the proxy statement. Filing ↗
63Section 02, Matthew Henn 2026-08-15Form 42026-08-180001193125-26-355718Insider equity transaction reported since the proxy statement. Filing ↗
64Section 02, Matthew Henn 2026-08-15Form 42026-08-180001193125-26-355718Insider equity transaction reported since the proxy statement. Filing ↗
65Section 02, Eric D. Shaff 2026-08-15Form 42026-08-180001193125-26-355722Insider equity transaction reported since the proxy statement. Filing ↗
66Section 02, Kelly Brady 2026-08-15Form 42026-08-180001193125-26-355734Insider equity transaction reported since the proxy statement. Filing ↗
67Section 02, Thomas DesRosier 2026-08-17Form 42026-08-180001193125-26-355712Insider equity transaction reported since the proxy statement. Filing ↗
68Section 02, Matthew Henn 2026-08-17Form 42026-08-180001193125-26-355718Insider equity transaction reported since the proxy statement. Filing ↗
69Section 02, Kelly Brady 2026-08-17Form 42026-08-180001193125-26-355734Insider equity transaction reported since the proxy statement. Filing ↗
70Section 02, Eric D. Shaff 2026-08-17Form 42026-08-180001193125-26-355722Insider equity transaction reported since the proxy statement. Filing ↗
71Section 06, 2026 voteForm 8-K2026-07-080001193125-26-298525Item 5.07 · say-on-pay result. As reported: 84.47% (votes for as printed: 3,374,813). Filing ↗
72Section 06, 2025 voteForm 8-K2025-04-140001193125-25-080185Item 5.07 · say-on-pay result. As reported: 64.03% (votes for as printed: 57,856,004). Filing ↗
73Section 06, 2023 voteForm 8-K2023-06-230001193125-23-173803Item 5.07 · say-on-pay result. As reported: 99.39% (votes for as printed: 91,849,150). Filing ↗
74Section 01 trend, Δ column (computed)Computed——Δ = current-FY total − prior-FY total per named officer.machine: formula: Δ = FY(n) − FY(n−1)
75Section 03b vehicle mix (computed)Computed——RSU / PSU / Options grant-date fair values summed per officer from the grants table; % performance-vested = PSU ÷ (RSU+PSU+Options).machine: formula: sums + PSU ratio
76Section 09b board cost (computed)Computed——Cash 342,629 + equity 0 + all other 0 = 342,629, summed across the director compensation table rows.machine: formula: Σ = 342,629
77Aura Biosciences, Section 10b CEO totalDEF 14A2026-04-200001193125-26-163933CEO total compensation as printed in Aura Biosciences's own proxy. As printed: 3,956,167. Filing ↗machine: t10 · r2 · c29 · span 480151–480160
78Larimar Therapeutics, Section 10b CEO totalDEF 14A2026-04-200001193125-26-163942CEO total compensation as printed in Larimar Therapeutics's own proxy. As printed: 3,526,423. Filing ↗machine: t90 · r3 · c39 · span 812416–812425
79Atea Pharmaceuticals, Section 10b CEO totalDEF 14A2026-04-270001193125-26-182293CEO total compensation as printed in Atea Pharmaceuticals's own proxy. As printed: 3,403,752. Filing ↗machine: r3 · c22 · span 1526943–1526952
80Enanta Pharmaceuticals, Section 10b CEO totalDEF 14A2026-01-260001193125-26-022558CEO total compensation as printed in Enanta Pharmaceuticals's own proxy. As printed: 2,769,548. Filing ↗machine: r2 · c16 · span 830357–830366
81Acrivon Therapeutics, Section 10b CEO totalDEF 14A2026-04-300001193125-26-194206CEO total compensation as printed in Acrivon Therapeutics's own proxy. As printed: 2,718,538. Filing ↗machine: r3 · c24 · span 492621–492630
82Regulus Therapeutics, Section 10b CEO totalDEF 14A2024-04-190001193125-24-102883CEO total compensation as printed in Regulus Therapeutics's own proxy. As printed: 2,575,123. Filing ↗machine: t54 · r2 · c27 · span 187482–187491
83Voyager Therapeutics, Section 10b CEO totalDEF 14A2026-04-280001104659-26-050297CEO total compensation as printed in Voyager Therapeutics's own proxy. As printed: 2,508,370. Filing ↗machine: t9 · r1 · c47 · span 370852–370861
84Assembly Biosciences, Section 10b CEO totalDEF 14A2026-04-220001193125-26-170417CEO total compensation as printed in Assembly Biosciences's own proxy. As printed: 2,482,987. Filing ↗machine: t38 · r2 · c25 · span 1134174–1134183
85Black Diamond Therapeutics, Section 10b CEO totalDEF 14A2026-04-290001104659-26-051474CEO total compensation as printed in Black Diamond Therapeutics's own proxy. As printed: 2,234,919. Filing ↗machine: r1 · c41 · span 370031–370040
86Mersana Therapeutics, Section 10b CEO totalDEF 14A2025-04-290001104659-25-040448CEO total compensation as printed in Mersana Therapeutics's own proxy. As printed: 1,613,754. Filing ↗machine: r1 · c41 · span 608188–608197
87Seres Therapeutics, Inc. (subject), Section 10b CEO totalDEF 14A2026-04-270001193125-26-182036CEO total compensation as printed in Seres Therapeutics, Inc.'s own proxy. As printed: 1,113,396. Filing ↗machine: r6 · c29 · span 975066–975075
88Section 10a, Enanta Pharmaceuticals reciprocityDEF 14A—0001193125-26-022558Enanta Pharmaceuticals's most recent proxy was read; its disclosed peer group does not include Seres Therapeutics, Inc.. Filing ↗
89Section 10a, Voyager Therapeutics reciprocityDEF 14A—0001104659-26-050297Voyager Therapeutics's most recent proxy was read; its disclosed peer group does not include Seres Therapeutics, Inc.. Filing ↗
90Section 10a, Assembly Biosciences reciprocityDEF 14A—0001193125-26-170417Assembly Biosciences's most recent proxy was read; its disclosed peer group does not include Seres Therapeutics, Inc.. Filing ↗
91Section 10a, Atea Pharmaceuticals reciprocityDEF 14A—0001193125-26-182293Atea Pharmaceuticals's most recent proxy was read; its disclosed peer group does not include Seres Therapeutics, Inc.. Filing ↗
92Section 10a, Regulus Therapeutics reciprocityDEF 14A—0001193125-24-102883Regulus Therapeutics's most recent proxy was read; its disclosed peer group does not include Seres Therapeutics, Inc.. Filing ↗
93Section 10a, Mersana Therapeutics reciprocityDEF 14A—0001104659-25-040448Mersana Therapeutics's most recent proxy was read; its disclosed peer group does not include Seres Therapeutics, Inc.. Filing ↗

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