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 (1 deal in the last 12 months vs 5 prior). Their most common stage is seed (46% of deals). Average disclosed round size is $21.5M (across 22 rounds with reported amounts).
Portfolio
20
Fund Size
$50M
Top Stage
Seed
Last 12 Mo
1
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
24 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 W4 Games | Series B | $18M | Aug 2026 |
 Tracel Ai | Unknown | $3M | Aug 2025 |
 BONX | Seed | — | Jun 2025 |
 Fabriq | Growth | $25M | Jun 2025 |
 Kraaft | Series A | — | Jan 2025 |
 Liquid | Series A | $250M | Dec 2024 |
 Plane | Seed | $4M | Jan 2024 |
 Desci Labs | Seed | $6.5M | 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 |
 Appsmith | Series B | $41M | Jan 2022 |
| Appsmith | Series A | $8M | Oct 2021 |
 Umbrel | Seed | $3M | Jan 2021 |
 Cerbos | Seed | $7.5M | Jan 2021 |
 Merico | Seed | $4.1M | Aug 2020 |
 Openbb | Seed | $8.5M | — |
 Hoppscotch | Unknown | $3M | — |
 Documenso | Pre-Seed | $1.3M | — |
 CUE Labs | Unknown | $10M | — |
| W4 Games | Series A | $15M | — |
| NocoDB | Series A | $10.5M | — |
 Plane | Seed | $4M | — |
Top Co-Investors
Flex Capital4 shared
Enterprise Ireland3 shared
Automattic2 shared
Stride.VC2 shared
Decibel2 shared
India Quotient2 shared
Accel2 shared
Canaan Partners2 shared
Insight Partners2 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
Last updated: 20 October 2026