Velarion · Company Intelligence
Compensation Brief
Fiscal year 2025 · Filings through 2026-06-25

Spero Therapeutics, Inc. (SPRO)

CEO Esther Rajavelu was paid $2,061,496 in fiscal year 2025, ↑ up 140.7% from fiscal year 2024 (SEC filing 0001193125-26-182201 ↗): 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.

$2,061,496 ↑
Esther Rajavelu total, FY2025
—
CEO pay percentile vs peers
—
CEO-to-median pay ratio
96.53%
Say-on-pay support, latest vote

SPRO's next annual pay disclosure, estimated April 27, 2027.est. Filing ↗

01

Summary Compensation Table — fiscal year 2025

Named executive officerSalaryBonusStock awardsOption awardsNon-equity incentivePension / NQDCAll otherTotal
Esther Rajavelu$577,179$687,479$413,705$0$372,000$0$11,134$2,061,496
President and Chief Executive Officer, Chief Financial Officer, Chief Business Officer and Treasurer(5)
Satyavrat Shukla244,153452,813603,3800307,9120416,9192,025,178
Former President and Chief Executive Officer(6)
Tim Keutzer484,566498,818213,7100232,592011,1341,440,820
Chief Operating 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
Esther Rajavelu$2,061,496$856,479—↑ +1,205,017
Satyavrat Shukla2,025,1781,953,237—↑ +71,941
Tim Keutzer1,440,8201,033,450—↑ +407,370

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

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Companies that benchmark against SPRO
1 company names SPRO as a compensation peer

Each company listed discloses SPRO in its own benchmarking peer group, as disclosed in each company's most recent proxy statement within the last two proxy seasons. Two companies are therefore absent by design: one that named SPRO in an earlier year and no longer does, and one whose own most recent disclosure is older than the last two seasons.

02

Equity transactions since the proxy statement was filed

No insider equity transactions reported since the proxy statement.

04

Outstanding equity awards at fiscal year-end 2025

ExecutiveAwardShares unvestedExercise priceMarket value unvested
Esther RajaveluRSU185,000—$431,050
Esther RajaveluRSU150,000—349,500
Tim KeutzerOption2,21611.18—
Tim KeutzerRSU179,798—418,929
Esther RajaveluRSU366,139—853,104
Tim KeutzerRSU266,139—620,104
Tim KeutzerRSU132,978—309,839
Esther RajaveluRSU89,899—209,465
Tim KeutzerRSU9,503—22,142
05

Incentive-plan design — the Compensation Discussion & Analysis

CEO STI target (% of salary)—
CEO LTI target (% of salary)—
Independent consultantMeridian Compensation Partners, LLC
Clawback policytrue
Anti-hedgingtrue
Anti-pledgingfalse
06

Say-on-pay — recent advisory votes

Meeting yearMeeting dateForAgainstAbstainSupportOutcome
20262026-06-2327,890,2541,002,982107,17496.53%Passed
20252025-06-1225,178,672638,744354,78497.53%Passed
20242024-05-2923,890,281442,014404,37198.18%Passed
20232023-10-0520,123,6471,145,027259,28594.62%Passed
20222022-09-15—————
20212021-08-17—————

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
20262026-06-2396.53%a
20252025-06-1297.53%b
20242024-05-2998.18%c

a. Voting standard not stated in the filing.

b. Voting standard not stated in the filing.

c. Voting standard not stated in the filing.

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.

08

Director compensation — fiscal year 2025

DirectorCash feesStock awardsOption awardsNon-equity incentiveAll otherTotal
John C. Pottage Jr., M.DNot independent · Development (Chair)$50,000$57,800——$225,000$332,800
Frank E. ThomasIndependent · Board Chair130,00057,800——0187,800
Patrick Vink, M.DIndependent · Nominating and Corporate Governance (Chair) · Compensation83,75057,800——0141,550
Milind Deshpande, Ph.DIndependent · Audit · Nominating and Corporate Governance · Development62,50057,800——0120,300
Cynthia SmithIndependent · Compensation (Chair)60,00057,800——0117,800
Scott JacksonIndependent · Audit · Nominating and Corporate Governance57,50057,800——0115,300
Kathleen TregoningIndependent · Compensation50,00057,800——0107,800
Ankit Mahadevia, M.DNot independent · Development45,00057,800——0102,800
Esther RajaveluEmployee director—————0
09

Board fee structure and ownership guideline

Annual cash retainer$40,000
Annual equity retainer$20,000
Per board meeting fee—
Committee chair fees (audit / comp / nom-gov)20,000 / 20,000 / 15,000
Stock ownership guideline—
09b

Total cost of the board

ComponentFY2025
Cash retainers and fees$538,750
Equity awards (grant-date value)$462,400
All other compensation$225,000
Total cost of the board$1,226,150

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

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
1Spero Therapeutics, Inc.2025Esther Rajavelu$577,179$413,705$0$372,000$2,061,496

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.

10d

Frequently asked questions

Who was the highest-paid executive at Spero Therapeutics, Inc. in fiscal 2025?
As disclosed, Esther Rajavelu (President and Chief Executive Officer, Chief Financial Officer, Chief Business Officer and Treasurer(5)) was the highest-paid executive at Spero Therapeutics, Inc. in fiscal 2025, with total compensation of $2,061,496.
How did shareholders vote on Spero Therapeutics, Inc.'s executive compensation?
As disclosed, 96.53% of shareholders supported Spero Therapeutics, Inc.'s executive compensation in the latest say-on-pay vote.
How much does Spero Therapeutics, Inc. spend in total on board compensation for fiscal 2025?
As disclosed, Spero Therapeutics, Inc. reported total board compensation of $1,226,150 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, Esther RajaveluDEF 14A2026-04-270001193125-26-182201Section “Executive Compensation”. As printed: 2,061,496. Filing ↗machine: r2 · c27 · span 236942–236951
2Section 01, Satyavrat ShuklaDEF 14A2026-04-270001193125-26-182201Section “Executive Compensation”. As printed: 2,025,178. Filing ↗machine: r6 · c27 · span 245546–245555
3Section 01, Tim KeutzerDEF 14A2026-04-270001193125-26-182201Section “Executive Compensation”. As printed: 1,440,820. Filing ↗machine: r4 · c27 · span 241280–241289
4Section 08, John C. Pottage Jr., M.DDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 332,800. Filing ↗machine: span 331454–331461
5Section 08, Frank E. ThomasDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 187,800. Filing ↗machine: span 334170–334177
6Section 08, Patrick Vink, M.DDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 141,550. Filing ↗machine: span 336893–336900
7Section 08, Milind Deshpande, Ph.DDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 120,300. Filing ↗machine: span 327380–327387
8Section 08, Cynthia SmithDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 117,800. Filing ↗machine: span 332823–332830
9Section 08, Scott JacksonDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 115,300. Filing ↗machine: span 328724–328731
10Section 08, Kathleen TregoningDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 107,800. Filing ↗machine: span 335544–335551
11Section 08, Ankit Mahadevia, M.DDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 102,800. Filing ↗machine: span 330104–330111
12Section 08, Esther RajaveluDEF 14A2026-04-270001193125-26-182201Section “Director Compensation”. As printed: 0. Filing ↗
13Section 06, 2026 voteForm 8-K2026-06-250001193125-26-283033Item 5.07 · say-on-pay result. As reported: 96.53% (votes for as printed: 27,890,254). Filing ↗
14Section 06, 2025 voteForm 8-K2025-06-180001193125-25-142807Item 5.07 · say-on-pay result. As reported: 97.53% (votes for as printed: 25,178,672). Filing ↗
15Section 06, 2024 voteForm 8-K2024-06-030001193125-24-153034Item 5.07 · say-on-pay result. As reported: 98.18% (votes for as printed: 23,890,281). Filing ↗
16Section 01 trend, Δ column (computed)Computed——Δ = current-FY total − prior-FY total per named officer.machine: formula: Δ = FY(n) − FY(n−1)
17Section 09b board cost (computed)Computed——Cash 538,750 + equity 462,400 + all other 225,000 = 1,226,150, summed across the director compensation table rows.machine: formula: Σ = 1,226,150
18Spero Therapeutics, Inc. (subject), Section 10b CEO totalDEF 14A2026-04-270001193125-26-182201CEO total compensation as printed in Spero Therapeutics, Inc.'s own proxy. As printed: 2,061,496. Filing ↗machine: r2 · c27 · span 236942–236951

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