Spero Therapeutics, Inc.

Spero Therapeutics, Inc.

SPROยทNASDAQ

$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

SEC Filings

SPRO - Filing history and reports

Filing TypeFiling DatePeriod EndingFiscal YearActions
10-Q

10-Q 2026 Q1

Q1

May 13, 2026
March 31, 2026
2026
8-K

8-K 2026

N/A

May 13, 2026
May 13, 2026
2026
DEF 14A

DEF 14A 2026

N/A

April 27, 2026
June 23, 2026
2026
8-K

8-K 2026

N/A

March 26, 2026
March 26, 2026
2026
10-K

10-K 2025 FY

FY

March 26, 2026
December 31, 2025
2025
8-K

8-K 2026

N/A

January 30, 2026
January 30, 2026
2026
8-K

8-K 2025

N/A

December 19, 2025
December 19, 2025
2025
8-K

8-K 2025

N/A

November 13, 2025
November 13, 2025
2025
10-Q

10-Q 2025 Q3

Q3

November 13, 2025
September 30, 2025
2025
10-Q

10-Q 2025 Q2

Q2

August 12, 2025
June 30, 2025
2025
Showing 1 to 10 of 165 filings

Understanding SEC Filings

Essential regulatory documents for investors

SEC filings are mandatory documents that publicly traded companies must submit to the Securities and Exchange Commission. These reports provide critical insights into a company's financial health, operations, risks, and strategic direction. For investors conducting due diligence, these filings are the most authoritative source of company information.

10-K

Annual Report

Comprehensive annual financial report filed within 60-90 days of fiscal year-end. Includes audited financial statements, management discussion & analysis (MD&A), risk factors, and detailed business operations. The most thorough financial disclosure of the year.

Filed annually
10-Q

Quarterly Report

Unaudited quarterly financial report filed within 40-45 days after each of the first three fiscal quarters. Provides updates on financial position, results of operations, and significant events. Essential for tracking quarterly performance trends.

Filed 3 times per year
8-K

Current Report

Event-driven filing for material events that shareholders should know about, filed within 4 business days. Includes acquisitions, executive changes, bankruptcy, earnings releases, and other significant developments. Critical for staying informed about breaking news.

Filed as events occur
DEF 14A

Proxy Statement

Definitive proxy statement sent to shareholders before annual meetings. Contains executive compensation details, board member information, voting matters, and corporate governance policies. Key for understanding management incentives and board composition.

Filed before shareholder meetings
S-1

Registration Statement

Initial registration for securities offerings, including IPOs. Provides detailed company history, business model, financial statements, risk factors, and use of proceeds. Essential for evaluating new investment opportunities and understanding company fundamentals.

Filed for new offerings
20-F

Foreign Annual Report

Annual report for foreign private issuers, equivalent to Form 10-K for non-U.S. companies. Filed within 4-6 months of fiscal year-end. Contains audited financials, business description, and regulatory disclosures adapted for international companies.

Foreign companies only

Why SEC Filings Matter

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  • Risk Assessment: Detailed risk factor disclosures help investors understand potential threats to business operations
  • Competitive Analysis: Business descriptions and segment data enable comparison with industry peers
  • Historical Context: Years of filings provide trend analysis and context for current performance