Windward Bio Announces $165M Crossover Financing to Advance Pipeline of Long-Acting Immunology Therapies With Best-in-Disease Potential

• Led by OrbiMed, with participation from RA Capital Management, Janus Henderson Investors, Sanofi Ventures, Harbour BioMed, and existing investors
• Proceeds will advance lead candidate WIN378 into Phase 3 and WIN027 into respiratory and dermatology studies by Q4 2026
• WIN378 has the potential to be the first-to-market, ultra long-acting anti-TSLP antibody for asthma and COPD
• WIN027 is a long-acting bispecific targeting TSLP and IL-13 with best-in-disease efficacy potential

BASEL, Switzerland, May 04, 2026 (GLOBE NEWSWIRE) -- Windward Bio, a private, clinical-stage biotechnology company committed to improving outcomes for people living with serious immunological diseases, today announced an upsized $165M crossover financing led by OrbiMed, with participation from existing Series A investors including Novo Holdings, Blue Owl Healthcare Opportunities, SR One, Omega Funds, RTW Investments, Qiming Venture Partners, Quan Capital, and Pivotal bioVenture Partners. The financing also included new investors RA Capital Management, Janus Henderson Investors, Sanofi Ventures, and Harbour BioMed. Proceeds will significantly extend the company’s cash runway and enable multiple clinical readouts in the next 12 months.

Since launching in January 2025, Windward Bio has in-licensed 2 clinical-stage assets, raised $365M, and rapidly advanced both programs in the clinic.

WIN378, the lead program, is a next-generation, fully human monoclonal antibody that potently binds to the thymic stromal lymphopoietin (TSLP) ligand. This well-validated cytokine plays a key role in the development and progression of a wide array of immunological diseases. WIN378 has the potential to be the first-to-market, ultra long-acting anti-TSLP antibody with twice-yearly dosing. The financing will accelerate the development of WIN378, which is currently being studied in the Phase 2/3 POLARIS program in asthma. The Phase 2 dose-ranging component of POLARIS is fully recruited, with initial data expected in second half of 2026. The first Phase 3 study of WIN378 is expected to begin in the fourth quarter of 2026. The Phase 2 SIRIUS study in chronic obstructive pulmonary disease (COPD) is anticipated to start in the second quarter of 2026.

WIN027, the second program, is a highly potent, long-acting bispecific antibody targeting both TSLP and interleukin-13 (IL-13), 2 well-validated and synergistic drivers of inflammation in severe asthma, COPD, and atopic dermatitis. WIN027 is currently in a Phase 1 study with data readout expected by the end of 2026. The financing will support multiple proof-of-concept studies across respiratory and dermatology indications starting in Q4 2026.

“We are excited to expand our shareholder base of top-tier investors to include RA Capital, Janus Henderson Investors, and Sanofi Ventures” said Luca Santarelli, MD, Founder, Chief Executive Officer, and Board Chair of Windward Bio. “This financing further strengthens our balance sheet and allows us to advance our programs of next-generation therapies for patients living with serious respiratory and dermatological diseases.”

“Windward Bio is uniquely positioned to make an impact in immunology with a differentiated portfolio that could raise the standards of care in respiratory and dermatology,” said David Bonita, General Partner at OrbiMed. “We are impressed with the significant progress the Windward Bio team has made since the company’s launch in 2025 and are proud to lead this high-caliber investor syndicate in supporting Windward Bio’s mission to discover and develop novel therapeutics for serious immunological conditions.”

About WIN378

WIN378 is a next-generation, fully human monoclonal antibody that potently inhibits the TSLP ligand. This clinically validated target plays a key role in the development and progression of a wide array of immunological diseases, including asthma and COPD. WIN378 has been engineered to achieve half-life extension (HLE) and have a silenced effector function. It has been studied in a Phase 1 trial, which confirmed an extended half-life suitable for twice-yearly dosing, demonstrated a low rate of antidrug antibodies, and was safe and well tolerated up to the highest dose tested. WIN378 is administered subcutaneously. Windward Bio licensed the global rights (excluding Greater China and several Southeast and West Asian countries) for WIN378 from Kelun-Biotech (also known as SKB378) and Harbour BioMed (also known as HBM9378). WIN378 is currently being evaluated in the POLARIS Phase 2/3 asthma study with initial readouts expected in the second half of 2026. A Phase 2 study in COPD is anticipated to begin in the second quarter of 2026. The first Phase 3 study of WIN378 is expected to begin in the fourth quarter of 2026.

About WIN027

WIN027 is a potential best-in-class, humanized bispecific monoclonal antibody with subpicomolar affinity for TSLP and IL-13, well-validated targets in immunological conditions. It has been engineered to achieve an extended half-life and enable less frequent dosing. Through this dual, long‑acting inhibition, WIN027 is designed to set a new standard of efficacy in conditions such as asthma, COPD, and atopic dermatitis, potentially delivering deeper and more durable disease control than existing biologics. WIN027 is currently in Phase 1. Windward Bio licensed global rights (excluding Greater China) for WIN027 from Qyuns Therapeutics (also known as QX027N).

About Windward Bio

Windward Bio is a clinical-stage biotechnology company with deep discovery, development, and commercialization expertise committed to transforming the treatment of people living with serious immunological conditions. Its lead program is WIN378, a potential best-in-disease, ultra long-acting anti-TSLP monoclonal antibody currently in a Phase 2/3 trial for asthma. The pipeline also includes WIN027, a clinical-stage, long-acting anti-TSLPxIL-13 bispecific with broad therapeutic potential across immunological diseases, which is currently in Phase 1. The company is building a discovery pipeline of long-acting bispecific antibodies, targeting validated biology in respiratory and dermatological conditions.

Contacts
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