01 Advisors is a venture capital firm co-founded in 2019 by former Twitter CEO Dick Costolo and former Twitter COO Adam Bain. The firm is headquartered in San Francisco, California, with an additional office in New York City. 01 Advisors focuses on providing strategic guidance and capital to early-stage technology companies, leveraging the extensive experience of its founders in scaling and managing high-growth organizations.

The firm's portfolio includes investments in companies such as TripActions, where Costolo and Bain have been actively involved in advisory roles. In November 2023, 01 Advisors raised $395 million for its third fund, surpassing the $325 million raised for its second fund. The firm also welcomed David Fischer, former Chief Revenue Officer at Facebook, as a partner, further strengthening its expertise in scaling revenue for technology companies.

01 Advisors continues to seek innovative startups with strong growth potential, offering both financial support and strategic guidance to help them achieve success.