01 Advisors (often referred to as '01A') is a San Francisco-based venture capital firm co-founded in 2018 by Dick Costolo, former CEO of Twitter, and Adam Bain, former COO of Twitter. The firm is built on the premise of providing operational expertise and mentorship to founders, moving beyond just capital investment. 01 Advisors focuses on investing in early to growth-stage technology companies across various sectors, particularly those with strong leadership and the potential for significant scale. They leverage their deep experience in building and scaling global tech companies to help their portfolio companies navigate challenges related to product, go-to-market strategy, company culture, and leadership.
The headquarters serves as the primary hub for all firm activities, including investment decision-making, due diligence, portfolio company support, partner meetings, and operational management.
Located in the Presidio of San Francisco, offering a unique campus-like environment with historic buildings and scenic views, conducive to focused work and collaboration.
The work culture at 01 Advisors is described as hands-on, operator-led, and founder-centric. It emphasizes direct engagement with portfolio companies, leveraging the partners' extensive operational backgrounds to provide practical advice and support.
Being in San Francisco provides 01 Advisors with direct access to a dense network of entrepreneurs, tech talent, co-investors, and industry experts, keeping them at the forefront of innovation.
While 01 Advisors is headquartered in San Francisco, their investment scope and portfolio company support have a global reach. They invest in companies that often have international aspirations and leverage their network and experience to help these companies expand into new markets. Their focus is on high-potential technology companies, irrespective of their initial geographical base, though many of their investments are in North America.
1 Letterman Dr, Building C
San Francisco
CA
USA
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As of April 2025, 01 Advisors' leadership includes:
01 Advisors has been backed by several prominent investors over the years, including:
01 Advisors has maintained a stable core leadership and partner team over the past 12 months, with no major publicly announced executive hires or departures at the Managing Partner or Partner level. The firm's focus remains on leveraging its existing experienced team to manage its funds and support its portfolio companies. Any team growth typically occurs at associate or platform levels to support ongoing operations.
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01 Advisors likely uses standard professional email address formats for its employees, typically combining first names, last names, or initials with their domain '01a.com'. Knowing common patterns can be helpful for outreach.
[first]@01a.com (e.g., adam@01a.com) or [first].[last]@01a.com (e.g., dick.costolo@01a.com)
Format
adam@01a.com
Example
80%
Success rate
TechCrunch • February 28, 2023
01 Advisors led an $18 million Series A funding round for Slope, a company developing AI-driven B2B payment solutions. This investment highlights 01 Advisors' interest in fintech and AI-powered enterprise solutions....more
Axios Pro (Reported) • November 16, 2023
Reports emerged that 01 Advisors is in the process of raising its third fund, targeting $400 million. This move signals the firm's continued growth and commitment to investing in promising technology startups....more
Fortune • May 10, 2021
01 Advisors officially announced the closing of its second fund at $325 million. The fund aimed to continue their strategy of backing founders with capital and operational expertise....more
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