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20% of OST-HER2 treated dogs survived 2-year vs. 1% in control group (p = 0.00995) Over 15,000 dogs per year diagnosed with osteosarcoma Company expects to submit U.S. Department of Agriculture meeting request to gain alignment on regulatory path towards conditional approval in the third quarter of 2026 OS Therapies reiterates plan to distribute OS Animal Health shares to shareholders OS Animal Health plans…

75% 2.5-year overall survival for OST-HER2 vs. 47% pooled historical control (p = 0.003), with no new patient deaths reported since the 2-year overall survival data (75% vs.

The Company confirms that it will release 2.5 year overall survival data from Phase 2b clinical trial OST-HER2 in the prevention or delay of recurrence in fully-resected pulmonary metastatic osteosarcoma during the 2026 American Society of Clinical Oncologists (ASCO) Annual Meeting being held from May 28, 2026 to June 2, 2026. New York, New York and Rockville, Maryland--(Newsfile Corp. - May 29, 2026) - OS…

$5.5 million financing that closed on April 2, 2026 together with $5.7 million in capital raised in Q1-2026, expected to provide Company with cash runway into 2027 $4.5 million of accrued VAT refunds and R&D refundable tax credits from UK subsidiary begin maturing, including $1.9 million VAT cash refund expected in June 2026 Successful EMA and Australia TGA (ATGA) meetings aligned around use of existing biomarker…

Appointment strengthens medical, regulatory, and commercial leadership as Company prepares to complete early market access regulatory filings in the U.S., U.K, Europe and Australia in anticipation of OST-HER2 approval decisions expected by year-end 2026 Upcoming FDA Pre-BLA meeting will focus on the use of recent seroconversion biomarker data as a key surrogate clinical efficacy endpoint to support a BLA for…