Dallas – – September 29, 2026 -- MassChallenge, ranked the No. 2 accelerator in the U.S. by TIME and Statista, has named Dallas its second U.S. headquarters, backed by a renewed two-year grant from Lyda Hill Philanthropies. The investment extends a five-year partnership at Pegasus Park and will fund two ten-week accelerator tracks in Health & Life Sciences and Security & Resiliency, plus Founder Access Clinics connecting early-stage founders with academic, clinical and corporate stakeholders.