OSS Capital is the first and only early-stage venture capital firm exclusively dedicated to backing commercial open-source software (COSS) startup founders globally. Founded in 2018 by Joseph Jacks and based in San Francisco, the firm has raised three funds of approximately $50 million each; the latest individual fund size is ~$50M.
Deal activity decreased year-over-year (2 deals in the last 12 months vs 3 prior). Their most common stage is seed (47% of deals). Average disclosed round size is $27.6M (across 13 rounds with reported amounts).
Portfolio
15
Fund Size
$50M
Top Stage
Seed
Last 12 Mo
0
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
15 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Tracel Ai | Unknown | $3M | Aug 2025 |
 BONX | Seed | — | Jun 2025 |
 Fabriq | Growth | $25M | Jun 2025 |
 Kraaft | Series A | — | Jan 2025 |
 Liquid AI, Inc | Series A | $250M | Dec 2024 |
 Plane | Seed | $4M | Jan 2024 |
 Appflowy | Seed | $6.4M | Nov 2023 |
 W4 Games | Seed | $8.5M | Aug 2022 |
 Cal Com | Series A | $25M | Jan 2022 |
 NocoDB | Seed | $10.5M | Jan 2022 |
 Umbrel | Seed | $3M | Jan 2021 |
 Openbb | Seed | $8.5M | — |
 Hoppscotch | Unknown | $3M | — |
 Documenso | Pre-Seed | $1.3M | — |
| CCUE Labs | Unknown | $10M | — |
Top Co-Investors
Flex Capital3 shared
Automattic2 shared
PagsGroup1 shared
Duke Capital Partners1 shared
AMD Ventures1 shared
Dynamo1 shared
BNVT Capital1 shared
Prosus Ventures1 shared
Purple1 shared
Kima Ventures1 shared
GitHub Fund1 shared
Red Hat1 shared
Lux Capital1 shared
Sisu Game Ventures1 shared
Expedition Growth Capital1 shared
Stride.VC1 shared
Dawn Capital1 shared
Chalfen Ventures1 shared
Brick & Mortar Ventures1 shared
Seven Seven Six1 shared
Last updated: 8 September 2026