Investor Lists

Series B open Source investors

Updated 7 November 2026

Firms we have watched take part in a Series B 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 69 →The top 25
69investors on the listNo change this week
3,277cheques in 12 months-2% against the market
$25Mmedian round they joined+213% against the market median
96%wrote a cheque in 12 months
78%have led a round

The Top 25

Ordered by cheques observed, never by anything anyone paid for

Deploying now (25)

  1. 1Y CombinatorDeploying nowAccelerator · United States6,412$3Mmedian roundOct 2026last seen
  2. 2Sequoia CapitalDeploying nowVC firm · United States2,099$35Mmedian roundNov 2026last seen
  3. 3Andreessen HorowitzDeploying nowVC firm · United States1,661$27Mmedian roundNov 2026last seen
  4. 4New Enterprise AssociatesDeploying nowVC firm · United States1,610$34Mmedian roundOct 2026last seen
  5. 5Lightspeed Venture PartnersDeploying nowVC firm · United States1,341$35Mmedian roundNov 2026last seen
  6. 6Intel CapitalDeploying nowCorporate VC · United States1,123$22Mmedian roundOct 2026last seen
  7. 7Menlo VenturesDeploying nowVC firm · United States740$37Mmedian roundOct 2026last seen
  8. 8Salesforce VenturesDeploying nowCorporate VC · United States649$26Mmedian roundNov 2026last seen
  9. 9CRVDeploying nowVC firm · United States588$20Mmedian roundOct 2026last seen
  10. 10BenchmarkDeploying nowVC firm · United States587$30Mmedian roundOct 2026last seen
  11. 11CitibankDeploying nowGrowth equity · United States566$20Mmedian roundOct 2026last seen
  12. 12FlybridgeDeploying nowVC firm · United States534$5Mmedian roundSept 2026last seen
  13. 13Founder CollectiveDeploying nowVC firm · United States502$8Mmedian roundSept 2026last seen
  14. 148VCDeploying nowVC firm · United States497$23Mmedian roundOct 2026last seen
  15. 15B CapitalDeploying nowVC firm · United States495$14Mmedian roundOct 2026last seen
  16. 16Spark CapitalDeploying nowVC firm · United States471$40Mmedian roundOct 2026last seen
  17. 17Lux CapitalDeploying nowVC firm · United States445$30Mmedian roundNov 2026last seen
  18. 18Union Square VenturesDeploying nowVC firm · United States407$17Mmedian roundNov 2026last seen
  19. 19Samsung NextDeploying nowCorporate VC · United States311$15Mmedian roundNov 2026last seen
  20. 20HeadlineDeploying nowVC firm · United States307$15Mmedian roundOct 2026last seen
  21. 21M12Deploying nowCorporate VC · United States300$30Mmedian roundOct 2026last seen
  22. 22Abstract VenturesDeploying nowVC firm · United States295$13Mmedian roundNov 2026last seen
  23. 23Sapphire VenturesDeploying nowVC firm · United States292$75Mmedian roundOct 2026last seen
  24. 24IVPDeploying nowVC firm · United States287$100Mmedian roundOct 2026last seen
  25. 25DST GlobalDeploying nowPrivate equity · United Kingdom158$81Mmedian roundOct 2026last seen
44 more on this list

All 69 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 →

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Quick answers about series B open Source investors

Who are the most active series B open Source investors?

By cheques observed, the most active are Y Combinator, Sequoia Capital, Andreessen Horowitz, New Enterprise Associates and Lightspeed Venture Partners.

How many series B open Source investors are there?

69 are on record. 96% made an investment in the last 12 months and 78% have led a round.

Which stages do series B open Source investors back?

Of the rounds with a named stage in the last 12 months, mostly Series A (23%) and Seed (23%).

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

The typical (median) round among the leading investors here is $26M.

Which sectors do series B open Source investors back most?

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

Which series B open Source investors lead the most rounds?

Andreessen Horowitz (114 led), Sequoia Capital (91 led) and Lightspeed Venture Partners (83 led).

Where are series B open Source investors based?

Most of the leading investors here are based in the United States (24 of the top 25); the rest in the United Kingdom.

What have series B open Source investors invested in recently?

Recent rounds include Shield AI (Nov 2026, with Disruptive), firmly (Series A, Nov 2026, with Samsung Next) and Zipline (Growth, Nov 2026, with Salesforce Ventures).

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