**Spero Therapeutics, Inc. Reports Financial Results and Operational Updates in Annual Filing**
Spero Therapeutics, Inc., a clinical-stage biopharmaceutical company, released its financial results and provided an operational update in its recent 10-K filing. The company, focused on novel treatments for rare diseases and diseases with high unmet need, reported a net income of $8.6 million for the year ended December 31, 2025, a significant shift from the $68.6 million net loss in the previous fiscal year. This improvement is primarily attributed to collaboration revenue recognized under the licensing agreement with GlaxoSmithKline (GSK) for tebipenem HBr, the company's lead clinical-stage product candidate. Spero Therapeutics has not generated any revenue from product sales to date.
The company's strategic focus has shifted towards advancing the development of tebipenem HBr and exploring opportunities to expand its portfolio of clinical-stage product candidates. As a result, Spero Therapeutics ceased development of its SPR206 and SPR720 programs in March and November 2025, respectively. Research and development expenses decreased significantly to $38.5 million in 2025 from $96.8 million in 2024, reflecting the termination of these programs and the progress of the tebipenem HBr clinical trial. General and administrative expenses also saw a decrease, totaling $21.2 million in 2025 compared to $23.7 million in the prior year.
A key operational highlight was the successful completion of the pivotal Phase 3 PIVOT-PO trial for tebipenem HBr, which met its primary endpoint and was stopped early for efficacy. GSK has submitted the data from the trial as part of a New Drug Application (NDA) Class 2 resubmission to the FDA in December 2025, which has been accepted by the FDA. The Prescription Drug User Fee Act (PDUFA) date has been set as June 18, 2026. Spero Therapeutics received a $25.0 million milestone payment from GSK in February 2026 upon the NDA resubmission. The company's cash and cash equivalents totaled $40.3 million as of December 31, 2025.
Looking ahead, Spero Therapeutics anticipates that its existing cash resources will be sufficient to fund its operating expenses and capital expenditure requirements into 2028. The company's future success is heavily reliant on the potential FDA approval and subsequent commercialization of tebipenem HBr, as well as its ability to secure additional funding through various means, including equity offerings, debt financings, and strategic collaborations. The company is also subject to ongoing obligations and potential milestone payments under its licensing agreements with Meiji and GSK.
About Spero Therapeutics, Inc.
Spero Therapeutics is a biopharmaceutical company focused on developing novel treatments for rare and multi-drug resistant bacterial infections. Its pipeline includes oral and IV antibiotics targeting serious infections like cUTI, HABP/VABP, and NTM pulmonary disease. The company collaborates with partners like GSK and Meiji, leveraging proprietary technology and strategic licensing to address high unmet medical needs in infectious diseases.
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