52 investors have funded 8 Open Source companies head-officed in Seattle, across 97 rounds (Apr 2009 – Feb 2026). They are ranked by how many Seattle companies in this market they have actually backed.
"In Seattle" describes the companies, not the investor: most of the money in any city comes from somewhere else, and the Where the money comes from section below shows exactly where it came from here.
Ranked by companies backed in this market and city, then by round count. "Led" counts rounds recorded with this investor as lead.
| # | Investor | Based in | Stages here | Companies | Rounds | Led | Latest | Portfolio total |
|---|---|---|---|---|---|---|---|---|
| 1 | Madrona Venture Group | Seattle, United States | Series ASeries BSeries C | 2 | 7 | 2 | Feb 2026 | 271 |
| 2 | Amplify Partners | Menlo Park, United States | Series DSeries ASeed | 2 | 6 | 1 | Feb 2026 | 129 |
| 3 | Voyager Capital | Seattle, United States | Series ASeries BSeed | 2 | 5 | 2 | Feb 2020 | 84 |
| 4 | Sequoia Capital | Menlo Park, United States | Series ASeries BSeries C | 1 | 5 | 1 | Feb 2026 | 1,568 |
| 5 | DFJ Growth | Menlo Park, United States | Series DSeries E+Series C | 1 | 5 | 2 | Sep 2015 | 83 |
| 6 | Index Ventures | London, United Kingdom | Series BSeries CSeries D | 1 | 4 | 1 | Feb 2026 | 639 |
| 7 | Battery Ventures | Boston, United States | Series DSeries E+Series C | 1 | 4 | 1 | Sep 2015 | 458 |
| 8 | Founder Collective | Cambridge, United States | Series ASeries B | 1 | 3 | — | Oct 2014 | 336 |
| 9 | Ignition Partners | Los Altos, United States | Series DSeries E+Series C | 1 | 3 | 1 | Sep 2015 | 54 |
| 10 | Tola Capital | Seattle, United States | Series ASeries BSeries C | 1 | 3 | — | Oct 2023 | 45 |
| 11 | Y Combinator | Mountain View, United States | Seed | 1 | 2 | 1 | Aug 2023 | 5,648 |
| 12 | New Enterprise Associates | Menlo Park, United States | Series BSeries C | 1 | 2 | 1 | Oct 2023 | 1,110 |
| 13 | Bessemer Venture Partners | Redwood City, United States | Series ASeed | 1 | 2 | 2 | Feb 2020 | 781 |
| 14 | Tiger Global Management | New York City, United States | Series CSeries D | 1 | 2 | 1 | Feb 2026 | 791 |
| 15 | Scale Venture Partners | Foster City, United States | Series DSeries E+ | 1 | 2 | 1 | Sep 2015 | 177 |
| 16 | Citi Ventures | New York City, United States | Series DSeries E+ | 1 | 2 | — | Sep 2015 | 160 |
| 17 | Founders' Co-op | Seattle, United States | Series ASeed | 1 | 2 | 2 | Feb 2020 | 97 |
| 18 | Addition | New York City, United States | Series B | 1 | 2 | — | Feb 2023 | 73 |
| 19 | NextGen Venture Partners | Baltimore, United States | Series ASeed | 1 | 2 | 2 | Feb 2020 | 56 |
| 20 | Bain Capital Crypto | Boston, United States | SeedSeries A | 1 | 2 | 1 | Jul 2023 | 21 |
| 21 | Andreessen Horowitz | New York City, United States | Series D | 1 | 1 | 1 | Feb 2026 | 1,117 |
| 22 | Lightspeed Venture Partners | Menlo Park, United States | Series D | 1 | 1 | — | Feb 2026 | 860 |
| 23 | GIC | Singapore, Singapore | Series D | 1 | 1 | — | Feb 2026 | 256 |
| 24 | Sapphire Ventures | Austin, United States | Series D | 1 | 1 | — | Feb 2026 | 189 |
| 25 | Craft Ventures | San Francisco, United States | Seed | 1 | 1 | 1 | Aug 2023 | 197 |
| 26 | Betaworks | New York City, United States | Seed | 1 | 1 | — | Nov 2022 | 168 |
| 27 | Greenoaks | San Francisco, United States | Series B | 1 | 1 | 1 | Feb 2023 | 110 |
| 28 | Galaxy | New York City, United States | Series A | 1 | 1 | — | Jul 2023 | 140 |
| 29 | Fenbushi Capital | Shanghai, China | Series A | 1 | 1 | — | Jul 2023 | 140 |
| 30 | Blockchain Capital | San Francisco, United States | Series A | 1 | 1 | 1 | Jul 2023 | 99 |
| 31 | Afore Capital | San Francisco, United States | Seed | 1 | 1 | 1 | Aug 2023 | 82 |
| 32 | IOSG Ventures | Hong Kong, China | Series A | 1 | 1 | — | Jul 2023 | 100 |
| 33 | Cota Capital | San Francisco, United States | Seed | 1 | 1 | — | Aug 2022 | 81 |
| 34 | Aglae Ventures | Paris, France | Series A | 1 | 1 | — | Jul 2023 | 73 |
| 35 | Fuel Capital | Burlingame, United States | Seed | 1 | 1 | — | Aug 2023 | 67 |
| 36 | Maven 11 | Amsterdam, Netherlands | Series A | 1 | 1 | — | Jul 2023 | 76 |
| 37 | Day One Ventures | San Francisco, United States | Seed | 1 | 1 | — | Aug 2023 | 77 |
| 38 | BlueYard | Berlin, Germany | Seed | 1 | 1 | — | Nov 2022 | 51 |
| 39 | Delphi | New York City, United States | Series A | 1 | 1 | — | Jul 2023 | 55 |
| 40 | D1 Ventures | Beijing, China | Seed | 1 | 1 | — | Aug 2022 | 49 |
| 41 | Figment Capital | New York City, United States | Series A | 1 | 1 | — | Jul 2023 | 40 |
| 42 | Alchemy | San Francisco, United States | Series A | 1 | 1 | — | Jul 2023 | 41 |
| 43 | RockawayX | Prague, Czech Republic | Series A | 1 | 1 | — | Jul 2023 | 41 |
| 44 | Millennium Technology Value Partners | New York City, United States | Series E+ | 1 | 1 | — | Sep 2015 | 31 |
| 45 | Hewlett Packard Pathfinder | Palo Alto, United States | Series E+ | 1 | 1 | — | Sep 2015 | 32 |
| 46 | Work Life Ventures | San Francisco, United States | Seed | 1 | 1 | — | Aug 2023 | 28 |
| 47 | MongoDB | New York City, United States | Series C | 1 | 1 | — | Mar 2025 | 14 |
| 48 | Neo | Shanghai, China | Seed | 1 | 1 | — | Aug 2023 | 12 |
| 49 | Strike Capital | San Francisco, United States | Series C | 1 | 1 | — | Oct 2023 | 5 |
| 50 | Ramez Naam | Seattle, United States | Seed | 1 | 1 | 1 | Mar 2022 | 2 |
| 51 | Tribute Labs | Brooklyn, United States | Series A | 1 | 1 | — | Jul 2023 | 2 |
| 52 | IOBC | Series A | 1 | 1 | — | Jul 2023 | 1 |
Head office of the investors on this page.
Rounds by stage — where in a company's life this money arrives.
Total disclosed size of each round, not one investor's share.
How active this market has been.
Open Source companies head-officed in Seattle that took money from these investors.
| Company | Backers | Rounds | Disclosed | Latest round |
|---|---|---|---|---|
| RISC Zero risczero.com |
16 | 17 | $558M | Series A Jul 2023 |
| Temporal temporal.io |
12 | 28 | $4.3B | Series D Feb 2026 |
| Chef chef.io |
8 | 19 | $591M | Series E+ Sep 2015 |
| Highlight highlight.io |
7 | 8 | $56.1M | Seed Aug 2023 |
| Pulumi pulumi.com |
4 | 9 | $306.5M | Series C Oct 2023 |
| Kaskada kaskada.io |
4 | 8 | $39.2M | Series A Feb 2020 |
| Blue Box blueboxcloud.com |
2 | 6 | $31.6M | Series B Oct 2014 |
| Subconscious Network subconscious.network |
2 | 2 | — | Seed Nov 2022 |
| Date | Investor | Company | Stage | Round size |
|---|---|---|---|---|
| Feb 2026 | Sapphire Ventures | Temporal | Series D | $300M |
| Feb 2026 | Lightspeed Venture Partners | Temporal | Series D | $300M |
| Feb 2026 | Andreessen HorowitzLED | Temporal | Series D | $300M |
| Feb 2026 | Sequoia Capital | Temporal | Series D | $300M |
| Feb 2026 | Index Ventures | Temporal | Series D | $300M |
| Feb 2026 | Amplify Partners | Temporal | Series D | $300M |
| Feb 2026 | Tiger Global Management | Temporal | Series D | $300M |
| Feb 2026 | Madrona | Temporal | Series D | $300M |
| Feb 2026 | GIC | Temporal | Series D | $300M |
| Mar 2025 | MongoDB | Temporal | Series C | $146M |
| Mar 2025 | Sequoia Capital | Temporal | Series C | $146M |
| Mar 2025 | Index Ventures | Temporal | Series C | $146M |
| Mar 2025 | Tiger Global ManagementLED | Temporal | Series C | $146M |
| Oct 2023 | New Enterprise Associates | Pulumi | Series C | $41M |
| Oct 2023 | Madrona Venture GroupLED | Pulumi | Series C | $41M |
| Oct 2023 | Tola Capital | Pulumi | Series C | $41M |
| Oct 2023 | Strike Capital | Pulumi | Series C | $41M |
| Aug 2023 | Afore CapitalLED | Highlight | Seed | $8M |
| Aug 2023 | Work Life Ventures | Highlight | Seed | $8M |
| Aug 2023 | Y Combinator | Highlight | Seed | $8M |
Open Source investors in other cities
Other markets in Seattle