Scoop: Bob Nelsen is building a Really Big Neuroscience Company

Over the last year, ARCH managing director Bob Nelsen has been quietly raising hundreds of millions of dollars to launch a massive neuroscience-focused biotech.

The company has been filing documents out of ARCH’s San Francisco office since at least May of 2020. Fittingly for Nelsen — the venture capitalist who initially christened the CAR-T company Juno “Fuck Cancer” and the cell therapy behemoth Sana “Fuck Disease” — the biotech is operating under a codename: RBNC Therapeutics. It stands, a source said, for Really Big Neuroscience Company.

Reached by email, Nelsen said that ARCH was working on a startup that would tackle both neurodegenerative disorders and psychiatric conditions, but declined to confirm specifics until the company emerged from stealth.

“I can confirm that we are working on a very unique neuroscience company that combines cutting-edge research focused on the development of new innovative…
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