01 Advisors
2026-10-1001a.com
Overview
What they do
01 Advisors was founded in 2018 by former Twitter CEO Dick Costolo and former Twitter COO Adam Bain, later joined by former Facebook CRO David Fischer. Positioned as 'For Operators, by Operators,' 01A leverages its partners' experience in scaling companies. They focus on hyper-growth technology companies that have achieved product-market fit and require operational expertise to build world-class businesses. The firm is known for its unique, founder-friendly advisory model, inspired by Bill Campbell.
01a.com
What they look for
Proven scaled operators are uniquely positioned to help hyper-growth companies reach the next level. 01A explicitly states that they come in right after companies have found product-market fit to focus entirely on scaling, go-to-market (GTM) strategies, and executive leadership.
01a.com
Stage
Series A, Series B+
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Sectors
SaaS, Fintech, Cybersecurity, Marketing and sales, AI, HR and recruiting
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Based
San Francisco, US
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Sources
Portfolio, cheque size and the rest
The companies they have backed, the cheque they write, and whether they are deploying right now.
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