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Zenas BioPharma, Inc.

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Zenas BioPharma Announces Data from the Registrational Phase 3 INDIGO Trial of Obexelimab in Immunoglobulin G4-Related Disease (IgG4-RD), Simultaneously Presented at the EULAR 2026 Congress and Published in the New England Journal of Medicine

- The INDIGO study met its primary and all key secondary endpoints with statistically significant results - - Obexelimab significantly lowered the total amount of glucocorticoid use and reduced glucocorticoid-related toxicities - - A Biologics License Application (BLA) for obexelimab in IgG4-RD was

Trial Results • Phase 3INDIGO Phase 3 results Tue, Jun 2, 2026

Zenas BioPharma Announces Submission of Biologics License Application (BLA) to U.S. FDA for Obexelimab in IgG4-RD

- BLA submission based on positive results from Phase 3 INDIGO trial - WALTHAM, Mass., May 28, 2026 (GLOBE NEWSWIRE) -- Zenas BioPharma, Inc. (“Zenas,” “Zenas BioPharma” or the “Company”) (Nasdaq: ZBIO), a clinical-stage global biopharmaceutical company committed to being a leader in the

Presentation / Abstract • Phase 3EULAR 2026 oral presentation Thu, Jun 4, 2026

Zenas BioPharma Announces Upcoming Presentation of Results from Phase 3 INDIGO Registrational Trial of Obexelimab in Immunoglobulin G4-Related Disease (IgG4-RD) at EULAR 2026 Congress

- Safety and efficacy results from the Phase 3 INDIGO trial to be presented by Emanuel Della Torre, M.D., Ph.D., on Thursday June 4, 2026, at 2:45 PM GMT - WALTHAM, Mass., May 19, 2026 (GLOBE NEWSWIRE) -- Zenas BioPharma, Inc. (“Zenas,” “Zenas BioPharma” or the “Company”) (Nasdaq: ZBIO), a

Presentation / Abstract • Phase 3Oral presentation Thu, Jun 4, 2026, 2:45 PM GMT

Zenas BioPharma Announces First Subject Dosed in Phase 1 Clinical Trial of ZB021, a Novel, Potentially Best-in-Class Oral IL-17AA/AF Inhibitor

- Phase 1 trial designed to evaluate the safety, tolerability, and pharmacokinetic properties of ZB021 in healthy volunteers and to establish proof-of-concept in patients with plaque psoriasis - - Phase 1 SAD and MAD data expected by year-end 2026, with proof-of-concept data in psoriasis patients

Trial Start • Phase 1Trial initiation Wed, May 13, 2026

Zenas BioPharma Reports First Quarter 2026 Financial Results and Provides Corporate Update

– Obexelimab marketing applications for the treatment of IgG4-RD on-target for submission to the FDA this quarter and the EMA in H2 2026 based on the Phase 3 INDIGO IgG4-RD trial results – – Obexelimab Phase 3 INDIGO IgG4-RD trial results accepted for oral presentation at EULAR 2026 – – Obexelimab

Presentation / Abstract • Phase 3EULAR oral presentation Thu, Jun 4, 2026

Zenas BioPharma Announces Late-Breaking Platform Presentation of Results from Phase 2 MoonStone Trial of Obexelimab in Relapsing Multiple Sclerosis at ACTRIMS Forum 2026

- Obexelimab met the primary endpoint with a 95% relative reduction in new gadolinium (Gd)-enhancing T1 lesions compared with placebo over weeks 8 and 12 (p=0.0009) - - Separately announced 24-week data support the robust and durable activity of obexelimab and further validate its unique inhibitory

Presentation / Abstract • Phase 2
Zenas BioPharma, Inc. • Endpoint Arena