Cabaletta Bio, Inc. reported significant financial results for the third quarter of 2025, with total operating expenses reaching $46.6 million, a 41% increase from $33.0 million in the same period last year. The company's net loss for the quarter was $44.9 million, compared to a loss of $30.6 million in the prior year, reflecting a year-over-year increase of 47%. For the nine months ending September 30, 2025, the total operating expenses amounted to $129.6 million, up from $91.4 million in the same period of 2024, while the net loss for this period was $125.9 million, compared to $83.3 million in the previous year.
The increase in operating expenses was primarily driven by a substantial rise in research and development costs, which totaled $39.8 million for the quarter, up from $26.3 million in Q3 2024. This increase was attributed to higher manufacturing costs, clinical trial expenses, and personnel costs associated with the ongoing development of the company's lead product candidate, resecabtagene autoleucel (rese-cel). The company also reported a decrease in interest income, which fell to $1.8 million from $2.4 million, largely due to reduced cash and investment balances.
Cabaletta Bio's operational developments included the ongoing enrollment in multiple clinical trials for rese-cel, which is designed to treat various autoimmune diseases. The company has received Fast Track and Orphan Drug designations from the FDA for several indications, including systemic lupus erythematosus and myositis. As of September 30, 2025, the company had $159.9 million in cash, cash equivalents, and investments, which it expects will fund operations into the second half of 2026. However, the company has raised substantial doubt about its ability to continue as a going concern without securing additional funding.
Strategically, Cabaletta has entered into several key agreements to bolster its manufacturing capabilities, including partnerships with Minaris Advanced Therapies and Lonza Houston Inc. These agreements are crucial for the clinical development of rese-cel and other product candidates. The company is also exploring the establishment of its own manufacturing facility to reduce reliance on third-party manufacturers, which may involve significant costs and time.
Looking ahead, Cabaletta Bio anticipates continued increases in research and development expenses as it advances its clinical programs. The company plans to raise additional capital through equity offerings and other financing methods to support its operations and product development initiatives. The successful commercialization of its product candidates remains uncertain, and the company acknowledges the risks associated with achieving regulatory approvals and market acceptance.
About Cabaletta Bio, Inc.
Cabaletta Bio is a clinical-stage biotechnology company developing engineered T cell therapies targeting autoimmune diseases. Its proprietary CABA platform includes CARTA and CAART strategies to reset or eliminate disease-causing B cells. The company’s lead candidate, rese-cel, aims to provide durable, potentially curative responses across multiple autoimmune conditions. It collaborates with academic and manufacturing partners to advance innovative, scalable therapies with a focus on safety and broad patient impact.
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