Ray Therapeutics is a Berkeley, California–based clinical-stage biopharmaceutical company developing optogenetic gene therapies to restore vision in patients with severe retinal degenerations. Its lead program, RTx-015, is an optogenetic gene therapy delivered as a single intravitreal injection and is being evaluated in patients with retinitis pigmentosa. The company’s second clinical-stage program, RTx-021, targets retinal bipolar cells and is designed for macular diseases such as Stargardt disease and geographic atrophy (GA AMD). RayTx’s approach delivers a bioengineered, highly light-sensitive protein to targeted retinal cells with the aim of improving visual function regardless of underlying genetic mutation. The company recently received Regenerative Medicine Advanced Therapy (RMAT) designation from the U.S. FDA for RTx-015, and it plans to use recent financing to advance late-stage clinical development and commercial readiness.

Total raised

$247M

Funding rounds

6

Latest round

Series B

Latest activity

Apr 2026