# Open Source investors (2026 list) > 180 open Source investors, 88% active in the last 12 months. Led by Y Combinator, 500 Global, Sequoia Capital. Ranked by what they funded. Source: https://millionrounds.com/lists/open-source-investors (Millionrounds; every figure on the page links to its filing or article) [Investor Lists](https://millionrounds.com/lists) # Open Source investors Updated 7 November 2026 Firms observed backing an open Source company in the last two years, taken from what they funded rather than from what their website says they like. [See all 180 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fopen-source-investors)The top 25 **180** investors on the list No change this week **6,612** cheques in 12 months *-2%* against the market **$20M** median round they joined *+150%* against the market median **88%** wrote a cheque in 12 months **66%** have led a round ## The Top 25 Ordered by cheques observed, never by anything anyone paid for Deploying now (25) - 1 [Y Combinator](https://millionrounds.com/fund/y-combinator) *Deploying now* Accelerator · United States **6,412** **$3M** median round **Oct 2026** last seen - 2 [500 Global](https://millionrounds.com/fund/500-startups) *Deploying now* Angel · United States **2,140** **$3.6M** median round **Oct 2026** last seen - 3 [Sequoia Capital](https://millionrounds.com/fund/sequoia-capital) *Deploying now* VC firm · United States **2,099** **$35M** median round **Nov 2026** last seen - 4 [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) *Deploying now* VC firm · United States **1,661** **$27M** median round **Nov 2026** last seen - 5 [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) *Deploying now* VC firm · United States **1,610** **$34M** median round **Oct 2026** last seen - 6 [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) *Deploying now* VC firm · United States **1,598** **$12M** median round **Nov 2026** last seen - 7 [General Catalyst](https://millionrounds.com/fund/general-catalyst) *Deploying now* VC firm · United States **1,387** **$27M** median round **Nov 2026** last seen - 8 [SV Angel](https://millionrounds.com/fund/sv-angel) *Deploying now* VC firm · United States **1,349** **$18M** median round **Oct 2026** last seen - 9 [Accel](https://millionrounds.com/fund/accel) *Deploying now* VC firm · United States **1,341** **$32M** median round **Nov 2026** last seen - 10 [Lightspeed Venture Partners](https://millionrounds.com/fund/lightspeed-venture-partners) *Deploying now* VC firm · United States **1,341** **$35M** median round **Nov 2026** last seen - 11 [Bpifrance](https://millionrounds.com/fund/bpifrance) *Deploying now* Government · France **1,151** **$4.5M** median round **Oct 2026** last seen - 12 [Khosla Ventures](https://millionrounds.com/fund/khosla-ventures) *Deploying now* VC firm · United States **1,128** **$26M** median round **Nov 2026** last seen - 13 [Intel Capital](https://millionrounds.com/fund/intel-capital) *Deploying now* Corporate VC · United States **1,123** **$22M** median round **Oct 2026** last seen - 14 [Bessemer Venture Partners](https://millionrounds.com/fund/bessemer-venture-partners) *Deploying now* VC firm · United States **1,038** **$30M** median round **Nov 2026** last seen - 15 [Index Ventures](https://millionrounds.com/fund/index-ventures) *Deploying now* VC firm · United Kingdom **1,027** **$31M** median round **Nov 2026** last seen - 16 [Gaingels](https://millionrounds.com/fund/gaingels) *Deploying now* Private equity · United States **1,010** **$8M** median round **Oct 2026** last seen - 17 [Google Ventures](https://millionrounds.com/fund/gv) *Deploying now* Corporate VC · United States **884** **$38M** median round **Oct 2026** last seen - 18 [Tiger Global Management](https://millionrounds.com/fund/tiger-global-management) *Deploying now* VC firm · United States **773** **$47M** median round **Nov 2026** last seen - 19 [Insight Partners](https://millionrounds.com/fund/insight-venture-partners) *Deploying now* VC firm · United States **765** **$40M** median round **Oct 2026** last seen - 20 [Menlo Ventures](https://millionrounds.com/fund/menlo-ventures) *Deploying now* VC firm · United States **740** **$37M** median round **Oct 2026** last seen - 21 [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures) *Deploying now* Corporate VC · United States **649** **$26M** median round **Nov 2026** last seen - 22 [Felicis](https://millionrounds.com/fund/felicis-ventures) *Deploying now* VC firm · United States **640** **$20M** median round **Nov 2026** last seen - 23 [CRV](https://millionrounds.com/fund/crv) *Deploying now* VC firm · United States **588** **$20M** median round **Oct 2026** last seen - 24 [Benchmark](https://millionrounds.com/fund/benchmark) *Deploying now* VC firm · United States **587** **$30M** median round **Oct 2026** last seen - 25 [Citibank](https://millionrounds.com/fund/citi) *Deploying now* Growth equity · United States **566** **$20M** median round **Oct 2026** last seen **155 more on this list** All 180 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 *→*](https://millionrounds.com/login?join=1&next=%2Fapp%2Finvestor-lists%2Fopen-source-investors) ## The Newest Cheques Rounds this list's investors joined most recently - **7** Nov **[LionBio Therapeutics](https://millionrounds.com/company/lionbio-therapeutics)** Pre-seed · $6M *With* [South Park Commons](https://millionrounds.com/fund/south-park-commons) - **6** Nov **[Shield AI](https://millionrounds.com/company/shield-ai)** $2B *Led by* [Disruptive](https://millionrounds.com/fund/disruptive) - **6** Nov **[Thinking Machines Lab](https://millionrounds.com/company/thinking-machines-lab)** Other · $5B *Led by* [Accel](https://millionrounds.com/fund/accel) - **6** Nov **[Harbinger](https://millionrounds.com/company/harbinger)** Series D+ · $240M *Led by* [Tiger Global Management](https://millionrounds.com/fund/tiger-global-management) - **5** Nov **[Siggy](https://millionrounds.com/company/siggy)** Pre-seed · $6M *Led by* [Village Global](https://millionrounds.com/fund/village-global-2) - **5** Nov **[firmly](https://millionrounds.com/company/firmly)** Series A · $15M *With* [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) ## Stages This Year 3,930 rounds - Venture **19%** - Seed **18%** - Series A **18%** - Series B **10%** - Pre-seed **9%** - Other **26%** ## What They Backed Sectors, last 12 months - AI **1,921** - Fintech **284** - Big Data & Analytics **218** - Healthcare **209** - Biotech **201** - Financial Services **168** ## Cheques by Quarter Led Joined 1,704 Q1 25 1,693 Q2 25 1,930 Q3 25 2,104 Q4 25 2,071 Q1 26 1,786 Q2 26 1,471 Q3 26 446 Q4 26 The last bar is the quarter still running. ## Lists Like This - [AI investors 7,040](https://millionrounds.com/lists/ai-investors) - [Fintech investors 2,997](https://millionrounds.com/lists/fintech-investors) - [Big Data & Analytics investors 1,954](https://millionrounds.com/lists/big-data-investors) - [Biotech investors 1,901](https://millionrounds.com/lists/biotech-investors) - [Robotics investors 1,714](https://millionrounds.com/lists/robotics-investors) - [Energy investors 1,707](https://millionrounds.com/lists/energy-investors) - [Construction investors 1,609](https://millionrounds.com/lists/construction-investors) - [Manufacturing investors 1,385](https://millionrounds.com/lists/manufacturing-investors) - [Cybersecurity investors 1,380](https://millionrounds.com/lists/cybersecurity-investors) [All investor lists *→*](https://millionrounds.com/lists) ## Quick answers about open Source investors ### Who are the most active open Source investors? By cheques observed, the most active are Y Combinator, 500 Global, Sequoia Capital, Andreessen Horowitz and New Enterprise Associates. ### How many open Source investors are there? 180 are on record. 88% made an investment in the last 12 months and 66% have led a round. ### Which stages do open Source investors back? Of the rounds with a named stage in the last 12 months, mostly Seed (25%) and Series A (24%). ### How big are the rounds open Source investors join? The typical (median) round among the leading investors here is $27M. ### Which sectors do open Source investors back most? In the last 12 months, mostly AI, Fintech and Big Data & Analytics. ### Which open Source investors lead the most rounds? Andreessen Horowitz (114 led), Accel (103 led) and General Catalyst (97 led). ### Where are open Source investors based? Most of the leading investors here are based in the United States (23 of the top 25); the rest in France and the United Kingdom. ### What have open Source investors invested in recently? Recent rounds include LionBio Therapeutics (Pre-seed, Nov 2026, with South Park Commons), Shield AI (Nov 2026, with Disruptive) and Thinking Machines Lab (Other, Nov 2026, with Accel). Built from the rounds we watched, refreshed every night. [How we count](https://millionrounds.com/methodology) · [Report a correction](https://millionrounds.com/corrections)