SPRO Spero Therapeutics, Inc.
NASDAQActiveCommon stock
SPRO is the ticker symbol of Spero Therapeutics, Inc., which is listed on NASDAQ. The symbol was previously used by SmartPros Ltd..
SPRO at a glance
- Symbol
- SPRO
- Company / issuer
- Spero Therapeutics, Inc.
- Security type
- Common stock
- Exchange
- NASDAQ
- Status
- Actively traded
- Seen in listing files
- Jan 2015 – present
- Sector
- Health Care
- Industry
- Biotechnology: Pharmaceutical Preparations
- Country
- United States
- IPO year
- 2017
- Market cap
- $72.8 million (Sep 2026)
SPRO ticker history
All companies and securities we have recorded under the symbol SPRO, from periodic snapshots of US exchange listing files.
| Name | Security | First seen | Last seen |
|---|---|---|---|
| SmartPros Ltd. | — | Jan 2015 | Jan 2015 |
| Spero Therapeutics, Inc. | Common Stock | Aug 2018 | present |
Spero Therapeutics, Inc. company profile
- Industry (SIC)
- Pharmaceutical Preparations
- Headquarters
- Cambridge, MA
- Incorporated in
- DE
- Fiscal year end
- December 31
- SEC filer category
- Non-accelerated filer<br>Smaller reporting company
- Latest annual report
- 10-K filed 2026-03-26
- Latest interim report
- 10-Q filed 2026-08-12
- SEC CIK
- 1701108
Source: SEC EDGAR filer data.
SPRO price chart
Interactive chart provided by TradingView (loads third-party scripts).
Frequently asked questions
What company has the ticker symbol SPRO?
SPRO is the ticker symbol of Spero Therapeutics, Inc on NASDAQ.
Is SPRO still trading?
Yes. SPRO appears in the current NASDAQ listings as of Sep 2026.
Which companies have used the ticker SPRO?
Our listing records show SPRO used by: SmartPros Ltd.; Spero Therapeutics, Inc..
Which exchange is SPRO listed on?
SPRO is listed on NASDAQ.
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