Spero Therapeutics, Inc.

Spero Therapeutics, Inc.

SPRO·NASDAQ

$2.83

+6.9%
HealthcareBiotechnology

Spero Therapeutics, Inc., a clinical-stage biopharmaceutical company, focuses on identifying, developing, and commercializing treatments for multi-drug resistant (MDR) bacterial infections and rare diseases in the United States. The company's product candidates include tebipenem pivoxil hydrobromide (HBr), an oral carbapenem-class antibiotic to treat complicated urinary tract infections, including pyelonephritis for adults; SPR206, a direct acting IV-administered agent to treat MDR Gram-negative bacterial infections in the hospital; and SPR720, an oral antibiotic for the treatment of non-tuberculous mycobacterial pulmonary disease. It has license agreement with Meiji Seika Pharma Co., Ltd. to support the development of tebipenem HBr; license agreement with Everest Medicines to develop, manufacture, and commercialize SPR206 in Greater China, South Korea, and Southeast Asian countries; collaboration agreement with Bill & Melinda Gates Medical Research Institute to develop SPR720 for the treatment of lung infections caused by Mycobacterium tuberculosis; and license agreement with Vertex Pharmaceuticals Incorporated for patents relating to SPR720, as well as SPR719, an active metabolite. The company was founded in 2013 and is headquartered in Cambridge, Massachusetts.

At a Glance

Live Snapshot
Market Cap$163.86M
EPS0.1500
P/E Ratio15.23
Earnings Date08/11/2026
-0.04%
Return on Invested Capital
-100%
3Y-100.0%
5Y-100.0%
10Y-100.0%
14.52%
Return on Equity
-110%
3Y-124.0%
5Y-124.0%
10Y-106.0%
12.44%
Return on Assets
-120%
3Y-133.0%
5Y-124.0%
10Y-107.0%
Spero Therapeutics, Inc.

Spero Therapeutics, Inc. Management Team

SPRO · NASDAQ
ME

Ms. Esther P. Rajavelu

Chief Executive Officer, Chief Financial Officer, President & Treasurer

Compensation

$668,290

Born 1979(Age 47)
female
MJ

Mr. James P. Brady

Chief Human Resource Officer

male
MT

Mr. Timothy Keutzer

Chief Operating Officer

Compensation

$657,072

Born 1968(Age 58)
male
DA

Dr. Ankit Mahadevia M.D., MBA

Co-Founder & Director

Compensation

$176,110

Born 1981(Age 45)
DD

Dr. David Hong

Senior Vice President of Clinical Development

MS

Ms. Sheila Finan

Senior Vice President of Controller

female
MJ

Mr. John Raymond

Senior Vice President of Finance & Business Operations

male
spro

Spero Therapeutics, Inc. Insider Positioning

SPRO · NASDAQ

During the last 12 months, insiders have sold $404K worth of SPRO shares, with no buying activity reported.

3 Months

Bought

0

0.00

Sold

25.2K

63.35K

Net Activity

-63K

-$63K

3-6 Months

Bought

0

0.00

Sold

102.1K

229.30K

Net Activity

-229K

-$229K

6-9 Months

Bought

0

0.00

Sold

40.3K

95.44K

Net Activity

-95K

-$95K

9-12 Months

Bought

0

0.00

Sold

8.3K

16.29K

Net Activity

-16K

-$16K

Top Buyers

No buying activity

Top Sellers

1
RE

Rajavelu Esther

Officer: See Remarks

121.1K shares4 transactions

$287K

2
KT

Keutzer Timothy

Officer: Chief Operating Officer

48.3K shares4 transactions

$105K

3
MA

Mahadevia Ankit

Director

6.6K shares1 transactions

$13K

Insider Activity Analysis

Net Insider Sentiment

Bearish

Strong bearish signal with $404K net selling. Heavy insider selling may indicate concerns about valuation or near-term prospects.

Buy/Sell Ratio

0.00:1

Very poor ratio. Heavy selling with minimal buying suggests insiders may be concerned about valuation or outlook.

Recent Trend (3 Months)

$63K

Heavy recent selling activity. Recent insider sales notably exceed purchases—may warrant investigation into company developments.

Insider Participation

High Selling

3 insider sellers vs. 0 buyers. Widespread selling across multiple insiders may signal concerns.

Insider Activity Insight

Multiple red flags: Heavy selling, numerous sellers, and continued recent selling create a concerning pattern. Investigate fundamental drivers and consider whether company guidance or industry conditions have deteriorated.

SEC Filings

SPRO - Filing history and reports

Filing TypeFiling DatePeriod EndingFiscal YearActions
DEF 14A

DEF 14A 2026

N/A

April 27, 2026
June 23, 2026
2026
DEF 14A

DEF 14A 2025

N/A

April 28, 2025
June 12, 2025
2025
DEF 14A

DEF 14A 2024

N/A

April 16, 2024
May 29, 2024
2024
DEF 14A

DEF 14A 2023

N/A

September 01, 2023
October 05, 2023
2023
DEF 14A

DEF 14A 2022

N/A

August 05, 2022
September 15, 2022
2022
DEF 14A

DEF 14A 2021

N/A

July 06, 2021
August 17, 2021
2021
DEF 14A

DEF 14A 2020

N/A

September 30, 2020
October 27, 2020
2020
DEF 14A

DEF 14A 2019

N/A

April 26, 2019
June 05, 2019
2019
DEF 14A

DEF 14A 2018

N/A

April 27, 2018
June 05, 2018
2018
Showing 1 to 9 of 9 filings