Altos Labs
Altos Labs is a Cellular Reprogramming & Rejuvenation company founded in 2022 and based in Redwood City, United States. It has raised $3B in total funding, most recently a Seed in 2022.
Altos Labs launched in January 2022 with roughly $3 billion in initial financing — one of the largest funding events in biotech history — backed by Jeff Bezos, Yuri Milner's Breakthrough vehicle, and ARCH Venture Partners' Robert Nelsen. Co-founded by Richard Klausner and Hans Bishop with cellular-reprogramming pioneer Juan Carlos Izpisua Belmonte among its founding scientists, the company is led by CEO Hal Barron (former GSK chief scientific officer). Altos pursues 'cellular rejuvenation programming' — partial reprogramming techniques that aim to restore cells to a healthier, more youthful state — across Institutes of Science in the San Francisco Bay Area, San Diego, and Cambridge, UK. In May 2025 it acquired Stanford senotherapeutics spinout Dorian Therapeutics, broadening into senescence-targeting approaches.
It is the best-capitalized company in the field, anchoring cellular reprogramming as a credible path to age-related disease therapeutics.
altoslabs.com ↗·Cellular Reprogramming & Rejuvenation·
United States·private 
