01A is a venture capital firm founded by former Twitter executives Dick Costolo and Adam Bain, investing in companies that have achieved product-market fit and are looking to scale. The firm provides capital and operational support, focusing on SaaS, AI, fintech, and cybersecurity at the Series A through C stages.
Average disclosed round size is $128.2M (across 40 rounds with reported amounts).
Portfolio
33
Fund Size
$395M
Top Stage
Series B
Last 12 Mo
4
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
45 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Fractile | Series B | $220M | Sep 2026 |
 Baseten | Series B | $1.5B | Jun 2026 |
| Baseten | Series E | $300M | Jan 2026 |
 Sublime Security | Series C | $60M | Oct 2025 |
 Sublime Security | Series C | $150M | Oct 2025 |
 Micro1 | Series A | $35M | Sep 2025 |
 Attio | Series B | — | Aug 2025 |
 Levelpath | Series B | $55M | Jun 2025 |
 BuildOps | Series C | $127M | Mar 2025 |
 Render | Series C | $80M | Jan 2025 |
| Fractile | Seed | $15M | Jul 2024 |
| Sublime Security | Series A | $20M | Apr 2024 |
 Nomad Homes | Series A | $20M | Oct 2023 |
 Capchase | Unknown | — | Jul 2022 |
 Postscript | Series C | $65M | Jun 2022 |
 Wheelhouse | Series A | $16M | Apr 2022 |
 Semsee | Series B | — | Feb 2022 |
 Autograph | Series B | $170M | Jan 2022 |
 Papaya | Series B | $50M | Dec 2021 |
 Tipalti | Series F | $270M | Dec 2021 |
 Density | Series D | $125M | Nov 2021 |
 HiveWatch | Series A | $20M | Oct 2021 |
 Electric AI | Series D | $90M | Oct 2021 |
 BrightHire | Series B | $20.5M | Oct 2021 |
| Nomad Homes | Series A | $20M | Sep 2021 |
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Top Co-Investors
Georgian Partners6 shared
Andreessen Horowitz5 shared
General Catalyst5 shared
Bessemer Venture Partners5 shared
Battery Ventures5 shared
Founders Fund5 shared
Durable Capital Partners5 shared
Conviction Partners5 shared
Slow Ventures4 shared
Citi Ventures4 shared
Index Ventures4 shared
Greylock Partners4 shared
Felicis4 shared
Zeev Ventures4 shared
Kleiner Perkins3 shared
Institutional Venture Partners3 shared
DST Global3 shared
New Enterprise Associates3 shared
GGV Capital3 shared
Last updated: 20 October 2026