
He learned how insurers deny claims from the inside. Then he built the machine that fights back for the doctors.
Everett Cook is the co-founder and CEO of Rho, a New York-based financial operations platform that combines business banking, corporate cards, payments, and expense management for growing companies. Before founding Rho in 2018 with Alex Wheldon, Cook spent roughly a decade in global macro investing, leading research at multi-billion-dollar funds and working in the orbit of figures like Steve Cohen and Michael Bloomberg. Raised in a New York finance family, he blends the discipline of a trader with an entrepreneurial streak that started at age 14, and has raised more than $200 million to build banking software for real, operating businesses rather than consumers.
Hinge Bio is a clinical-stage biotechnology company in Burlingame, California, building next-generation antibody therapeutics on its proprietary GEM-DIMER platform. The platform engineers multivalent, multispecific antibodies that bind their targets cooperatively for dramatically enhanced potency. Its lead candidate, HB2198, is a B cell-depleting agent targeting both CD19 and CD20 with enhanced natural killer cell engagement, now in Phase 1 trials for systemic lupus erythematosus and lupus nephritis. The company raised a $30M Series A led by Point72 in January 2025.