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Spero Therapeutics, Inc. (NASDAQ:SPRO)

US · Delayed Price · Currency is USD
1.17-0.02 (-1.68%)
 
Market Cap67.74M-48.7%
Revenue (ttm)42.96M-7.0%
Net Income7.38M+113.8%
EPS0.11+111.1%
Shares Out57.90M
PE Ratio8.36
Forward PEn/a
Dividendn/a
Ex-Dividend DateSep 16, 2015
Volume233,549
Open1.19
Previous Close1.19
Day's Range1.16 - 1.19
52-Week Range1.08 - 3.08
Beta1.50
AnalystsBuy
Price Targetn/a
Earnings DateNov 12, 2026
Insider Score
––Not scored
SPRO Insider Score

Insiders here have filed 1 Form 4 in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.

About SPRO

Spero Therapeutics, Inc. is a biopharmaceutical firm in the clinical development stage, primarily focused on discovering, advancing, and commercializing innovative treatments for multi-drug resistant (MDR) bacterial infections and rare diseases within the United States. The company's pipeline includes several key therapeutic candidates: tebipenem pivoxil hydrobromide (HBr), an oral carbapenem-class antibiotic designed to address complicated urinary tract infections (cUTIs), including pyelonephritis, in adult patients. SPR206, an intravenously administered agent specifically developed to combat MDR Gram-negative bacterial infections in hospital environments. SPR720, an oral antibiotic targeting non-tuberculous mycobacterial (NTM) pulmonary disease. Spero Therapeutics has also forged several strategic alliances: A licensing agreement with Meiji Seika Pharma Co., Ltd. supports the ongoing development of tebipenem HBr. A separate licensing deal with Everest Medicines grants rights for the development, manufacturing, and commercialization of SPR206 across Greater China, South Korea, and various Southeast Asian nations. The company collaborates with the Bill & Melinda Gates Medical Research Institute to advance SPR720 for treating lung infections caused by Mycobacterium tuberculosis. Furthermore, a licensing agreement with Vertex Pharmaceuticals Incorporated covers patents associated with SPR720 and its active metabolite, SPR719. Founded in 2013, Spero Therapeutics maintains its corporate headquarters in Cambridge, Massachusetts.

Address
675 Massachusetts Avenue, Cambridge, MA, 02139, US
Market Cap
68 million
Employees
25
Industrial Classification
Biotechnology

What Are Insiders Doing?

Open-market buy / sell balanceNet Selling
Sold
$552.04K
Bought
$0

View the trades behind this meter — each links to its SEC Form 4 →

Open-market Form 4 purchases (code P) vs sales (code S) on file for this company. Grants, option exercises and tax withholdings are excluded. Informational only.

1 Day
-1.68%
5 Days
-7.14%
1 Month
-1.68%
6 Months
-56.99%
1 Year
-48.68%

$SPRO stock is featured in our Insider Trades datasets.

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Recently reported changes in SPRO holdings by institutional investors

Scanning latest 13F filings…

Latest 0 13F filings · Source: SEC EDGAR

View all institutional owners →

Insider Trading

Quarterly net insider trading by SPRO's directors and management

Net Shares Purchased by Insiders−200k−100k02025Q42026Q12026Q22026Q32026Q4

Source: SEC EDGAR (Form 4)

Corporate Lobbying

SPRO Estimated quarterly lobbying spending

Source: U.S. Senate LDA

U.S. Patents

New SPRO patent grants

Loading patent grants…

Source: USPTO Open Data Portal

Government Contracts

Estimated quarterly amount awarded to SPRO from public contracts

Source: USAspending.gov

Top ETF Holders

ETFs with the largest estimated holdings in SPRO

ETFEst. Holding Size
VTIVanguard Morningstar Total Stock Market ETF$1.70M
VXFVanguard Extended Market ETF$723.77K
GISCGuggenheim Funds Trust - Guggenheim Securitized Income ETF$175.67K
IWCiShares Micro-Cap ETF$170.46K
QQQSInvesco NASDAQ Future Gen 200 ETF$117.03K
PRFZInvesco RAFI US 1500 Small-Mid ETF$79.75K

Estimated from each fund’s disclosed top holdings × AUM

SPRO Insider Score

Our composite score: insider buying, sector, volume, tone & dilution

No Insider Score for SPRO yet — no open-market insider buys or sells in the last 90 days.

Bull Case vs Bear Case

AI-generated from SPRO’s recent data — informational, not investment advice

Generating analysis…

Recent Insider Activity

Buys
0
Sells
9
Buy Value
$0
Distinct Buyers
0

Frequently Asked Questions

Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.
Spero Therapeutics, Inc. (SPRO) Insider Trading, Form 4 Buys & Sells | InsiderBuying.com