NASDAQ: SPRO
Spero Therapeutics Inc Stock

$2.28+0.17 (+8.06%)
Updated Jun 18, 2026
SPRO Price
$2.28
Fair Value Price
N/A
Market Cap
$132.02M
52 Week Low
$1.80
52 Week High
$3.22
P/E
8.44x
P/B
2.49x
P/S
2.19x
PEG
0.18x
Dividend Yield
N/A
Revenue
$61.19M
Earnings
$15.24M
Gross Margin
100%
Operating Margin
25.33%
Profit Margin
24.9%
Debt to Equity
0.12
Operating Cash Flow
$7M
Beta
0.79
Next Earnings
N/A
Ex-Dividend
N/A
Next Dividend
N/A

SPRO Overview

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.

Zen Rating

Our proven quant model uses 115 proprietary factors, including AI, to determine SPRO's potential to beat the market

CHold
  • Stocks with a Zen Rating of Hold (C) had an average return of +7.53% per year. Learn More

Zen Rating Component Grades

C
Zen Rating uses advanced AI algorithms that detect subtle patterns in market data; it anticipates future trends that point to superior stock price results.

Industry: Biotech

Industry Rating
F
SPRO
Ranked
#67 of 465

Top Ranked Stocks in Industry

Name / TickerPriceZen Rating
$224.66A
$51.91A
$16.46A
View Top Biotech Stocks

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SPRO News

Overview

Due Diligence Score

Industry Average (24)
You've viewed Due Diligence Score for 10/10 free stocks. Upgrade to Premium to see how SPRO scored across 33 valuation, financial, forecast, performance, and dividend due diligence checks.

Due Diligence Checks

SPRO ($2.28) is trading below its intrinsic value of $5.72, according to an updated version of Benjamin Graham's Formula from Chapter 11 of "The Intelligent Investor"
Below Benjamin Graham Formula Value Valuation
SPRO is good value based on its earnings relative to its share price (8.44x), compared to the US market average (9.47x)
P/E vs Market Valuation
SPRO is good value based... subscribe to Premium to read more.
P/E vs Industry Valuation
There are 30 more SPRO due diligence checks available for Premium users.

Valuation

SPRO price to earnings (PE)

For valuing profitable companies with steady earnings

Company
8.44x
Industry
15.77x
Market
9.47x
SPRO is good value based... subscribe to Premium to read more.
P/E vs Industry Valuation
SPRO is good value based... subscribe to Premium to read more.
P/E vs Market Valuation

SPRO price to book (PB)

For valuing companies that are loss-making or have lots of physical asset

Company
2.49x
Industry
4.95x
SPRO is good value based... subscribe to Premium to read more.
P/B vs Industry Valuation

SPRO price to earnings growth (PEG)

For valuing profitable companies with growth potential

SPRO is good value based... subscribe to Premium to read more.
PEG Value Valuation

SPRO's financial health

Profit margin

Revenue
$258.0k
Net Income
-$7.2M
Profit Margin
-2,791.9%
SPRO's Earnings (EBIT) of $15.50M... subscribe to Premium to read more.
Interest Coverage Financials
SPRO's profit margin has increased... subscribe to Premium to read more.
Profit Margin Growth Financials

Assets to liabilities

Assets
$59.0M
Liabilities
$6.1M
Debt to equity
0.12
SPRO's short-term assets ($57.61M) exceed... subscribe to Premium to read more.
Short-term Liabilities Financials
SPRO's short-term assets ($57.61M) exceed... subscribe to Premium to read more.
Long-term Liabilities Financials
SPRO's debt relative to shareholder... subscribe to Premium to read more.
Shrinking Debt Financials
SPRO's debt to equity ratio... subscribe to Premium to read more.
Healthy Debt to Equity Financials

Cash flow

Operating
$15.9M
Investing
$0.0
Financing
$0.0
SPRO's operating cash flow ($7.24M)... subscribe to Premium to read more.
Debt Coverage Financials

SPRO vs Biotech Stocks

TickerZen RatingMarket Cap1d %P/EP/B
SPROC$132.02M+8.06%8.44x2.49x
GNLXD$132.95M+4.04%-3.49x5.80x
IFRXC$130.85M-0.55%-2.48x3.01x
CGTXC$129.77M+2.11%-6.04x4.34x
PYXSD$128.61M+6.84%-1.55x4.11x

Spero Therapeutics Stock FAQ

What is Spero Therapeutics's quote symbol?

(NASDAQ: SPRO) Spero Therapeutics trades on the NASDAQ under the ticker symbol SPRO. Spero Therapeutics stock quotes can also be displayed as NASDAQ: SPRO.

If you're new to stock investing, here's how to buy Spero Therapeutics stock.

What is the 52 week high and low for Spero Therapeutics (NASDAQ: SPRO)?

(NASDAQ: SPRO) Spero Therapeutics's 52-week high was $3.22, and its 52-week low was $1.80. It is currently -29.19% from its 52-week high and 26.67% from its 52-week low.

How much is Spero Therapeutics stock worth today?

(NASDAQ: SPRO) Spero Therapeutics currently has 57,901,493 outstanding shares. With Spero Therapeutics stock trading at $2.28 per share, the total value of Spero Therapeutics stock (market capitalization) is $132.02M.

Spero Therapeutics stock was originally listed at a price of $11.50 in Nov 2, 2017. If you had invested in Spero Therapeutics stock at $11.50, your return over the last 8 years would have been -80.17%, for an annualized return of -18.31% (not including any dividends or dividend reinvestments).

How much is Spero Therapeutics's stock price per share?

(NASDAQ: SPRO) Spero Therapeutics stock price per share is $2.28 today (as of Jun 18, 2026).

What is Spero Therapeutics's Market Cap?

(NASDAQ: SPRO) Spero Therapeutics's market cap is $132.02M, as of Jun 22, 2026.

Market cap (market capitalization) is the total market value of a publicly traded company's outstanding shares.

Spero Therapeutics's market cap is calculated by multiplying SPRO's current stock price of $2.28 by SPRO's total outstanding shares of 57,901,493.
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