Investor Lists

Series A open Source investors

Updated 7 November 2026

Firms we have watched take part in a Series A round raised by an open Source company in the last two years. Both the stage and the sector are what they did, not what their website says.

See all 29 →The top 25
29investors on the listNo change this week
1,769cheques in 12 months-10% against the market
$16Mmedian round they joined+100% against the market median
83%wrote a cheque in 12 months
55%have led a round

The Top 25

Ordered by cheques observed, never by anything anyone paid for

Deploying now (23)

  1. 1Y CombinatorDeploying nowAccelerator · United States6,412$3Mmedian roundOct 2026last seen
  2. 2500 GlobalDeploying nowAngel · United States2,140$3.6Mmedian roundOct 2026last seen
  3. 3AccelDeploying nowVC firm · United States1,341$32Mmedian roundNov 2026last seen
  4. 4GaingelsDeploying nowPrivate equity · United States1,010$8Mmedian roundOct 2026last seen
  5. 5BenchmarkDeploying nowVC firm · United States587$30Mmedian roundOct 2026last seen
  6. 6Bain Capital VenturesDeploying nowVC firm · United States524$27Mmedian roundNov 2026last seen
  7. 7Soma CapitalDeploying nowVC firm · United States456$4.2Mmedian roundOct 2026last seen
  8. 8Peak XVDeploying nowVC firm · United States317$15Mmedian roundNov 2026last seen
  9. 9NFXDeploying nowVC firm · United States191$10Mmedian roundSept 2026last seen
  10. 10SignalFireDeploying nowVC firm · United States188$16Mmedian roundOct 2026last seen
  11. 11Kindred VenturesDeploying nowVC firm · United States110$10Mmedian roundOct 2026last seen
  12. 12Basis Set VenturesDeploying nowVC firm · United States93$13Mmedian roundOct 2026last seen
  13. 13Panache VenturesDeploying nowVC firm · Canada86$3.8Mmedian roundSept 2026last seen
  14. 14HubSpot VenturesDeploying nowCorporate VC · United States64$25Mmedian roundNov 2026last seen
  15. 15Thomas WolfDeploying nowVC firm41$8Mmedian roundOct 2026last seen
  16. 16Wavemaker PartnersDeploying nowVC firm · Singapore32$5.5Mmedian roundAug 2026last seen
  17. 17BMW i VenturesDeploying nowCorporate VC · United States31$26Mmedian roundOct 2026last seen
  18. 18AMD VenturesDeploying nowVC firm · United States26$315Mmedian roundOct 2026last seen
  19. 19Kickstart VenturesDeploying nowCorporate VC · Philippines17$13Mmedian roundApr 2026last seen
  20. 20Olivier PomelDeploying nowVC firm16$23Mmedian roundOct 2026last seen
  21. 21Airbus VenturesDeploying nowCorporate VC · United States7$20Mmedian roundNov 2026last seen
  22. 22Brian BalfourDeploying nowAngel4$28Mmedian roundJun 2026last seen
  23. 23Thomas DohmkeDeploying nowVC firm3$6Mmedian roundJul 2026last seen
  24. 24GitHub FundquietInvestment firm2$25Mmedian roundOct 2025last seen
  25. 25Lukas BiewaldquietAngel2$20Mmedian roundOct 2025last seen
4 more on this list

All 29 are in the app, with filters for stage, sector and market. A free account shows 10 per search, Pro up to 1,000.

See the whole list →

Reading for founders at Series A

More books for founders and investors on the Reading List.

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Quick answers about series A open Source investors

Who are the most active series A open Source investors?

By cheques observed, the most active are Y Combinator, 500 Global, Accel, Gaingels and Benchmark.

How many series A open Source investors are there?

29 are on record. 83% made an investment in the last 12 months and 55% have led a round.

Which stages do series A open Source investors back?

Of the rounds with a named stage in the last 12 months, mostly Seed (26%) and Pre-seed (24%).

How big are the rounds series A open Source investors join?

The typical (median) round among the leading investors here is $15M.

Which sectors do series A open Source investors back most?

In the last 12 months, mostly AI, Fintech and Big Data & Analytics.

Which series A open Source investors lead the most rounds?

Accel (103 led), Bain Capital Ventures (31 led) and Benchmark (18 led).

Where are series A open Source investors based?

Among the most active, most are based in the United States (16), Canada (1) and Singapore (1).

What have series A open Source investors invested in recently?

Recent rounds include Thinking Machines Lab (Other, Nov 2026, with Accel), CesiumAstro (Series D+, Nov 2026, with Airbus Ventures) and Agrani Labs (Nov 2026, with Peak XV).

Built from the rounds we watched, refreshed every night. How we count · Report a correction