01 Advisors

​01 Advisors (01A) is a venture capital firm founded in 2018 by former Twitter executives Dick Costolo and Adam Bain, with David Fischer joining as a partner in 2023. Based in San Francisco and New York City, 01A focuses on investing in technology companies that have achieved product-market fit, typically at Series A and B stages. The firm's partners leverage their extensive experience in scaling companies to assist founders in transitioning from building a product to building a company.

01 Advisors was founded in 2018 by Dick Costolo (Managing Partner), Adam Bain (Managing Partner ).

01 Advisors is based in 415 Jackson St, San Francisco, CA 94111, USA. The company also has offices abroad.