45 investors have funded 8 Cybersecurity companies head-officed in Ann Arbor, across 78 rounds (Oct 2002 – Mar 2026). They are ranked by how many Ann Arbor companies in this market they have actually backed.
"In Ann Arbor" 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 | Google Ventures | Mountain View, United States | Series DSeries CSeries B | 2 | 9 | 3 | Mar 2026 | 736 |
| 2 | Intel Capital | Santa Clara, United States | Series ASeries CSeries B | 2 | 5 | 1 | Mar 2026 | 764 |
| 3 | Greylock Partners | Menlo Park, United States | Series CSeries BSeries A | 1 | 5 | 1 | Mar 2026 | 471 |
| 4 | True Ventures | Palo Alto, United States | Series DSeries ASeed | 1 | 5 | — | Oct 2017 | 364 |
| 5 | Decibel | Palo Alto, United States | Series CSeries BSeries A | 1 | 4 | 1 | Mar 2026 | 34 |
| 6 | Redpoint Ventures | Woodside, United States | Series CSeries D | 1 | 2 | 1 | Oct 2017 | 421 |
| 7 | Benchmark | San Francisco, United States | Series BSeries C | 1 | 2 | — | Apr 2015 | 293 |
| 8 | M25 | Chicago, United States | SeedSeries A | 1 | 2 | 1 | Aug 2021 | 95 |
| 9 | Ten Eleven Ventures | Boston, United States | Series ASeries B | 1 | 2 | 1 | Jun 2023 | 62 |
| 10 | Array Ventures | San Francisco, United States | SeedSeries A | 1 | 2 | — | Aug 2021 | 37 |
| 11 | Tamiami Angel Funds | Naples, United States | Series A | 1 | 2 | 1 | Sep 2025 | 20 |
| 12 | Duchossois Capital Management | Chicago, United States | Series A | 1 | 2 | 1 | Jan 2005 | 11 |
| 13 | Resonant Venture Partners | Ann Arbor, United States | Series CSeries D | 1 | 2 | — | Oct 2017 | 9 |
| 14 | Arbor Partners | Ann Arbor, United States | Series A | 1 | 2 | — | Jan 2005 | 5 |
| 15 | M Group | Birmingham, United States | Series A | 1 | 2 | — | Jan 2005 | 2 |
| 16 | Index Ventures | London, United Kingdom | Series D | 1 | 1 | — | Oct 2017 | 639 |
| 17 | Morgan Stanley | New York City, United States | Series D | 1 | 1 | 1 | Mar 2026 | 373 |
| 18 | Meritech | Palo Alto, United States | Series D | 1 | 1 | 1 | Oct 2017 | 184 |
| 19 | Next47 | Palo Alto, United States | Series A | 1 | 1 | — | Oct 2002 | 170 |
| 20 | HPA | Chicago, United States | Series B | 1 | 1 | — | Jun 2023 | 94 |
| 21 | Mercury Fund | Houston, United States | Series B | 1 | 1 | — | Jun 2023 | 86 |
| 22 | Arthur Ventures | Minneapolis, United States | Series A | 1 | 1 | 1 | Sep 2025 | 66 |
| 23 | Ascension Ventures | Clayton, United States | Series C | 1 | 1 | — | Oct 2023 | 72 |
| 24 | Lead Edge Capital | New York City, United States | Series D | 1 | 1 | 1 | Oct 2017 | 66 |
| 25 | RPM Ventures | Ann Arbor, United States | Seed | 1 | 1 | 1 | Sep 2011 | 45 |
| 26 | Geodesic Capital | Foster City, United States | Series D | 1 | 1 | — | Oct 2017 | 49 |
| 27 | Blockchange | New York City, United States | Series A | 1 | 1 | 1 | Dec 2025 | 58 |
| 28 | Workday Ventures | San Francisco, United States | Series D | 1 | 1 | — | Oct 2017 | 49 |
| 29 | Hamilton Lane | Conshohocken, United States | Series C | 1 | 1 | — | Oct 2023 | 46 |
| 30 | Four Rivers Group | San Francisco, United States | Series C | 1 | 1 | — | Oct 2023 | 45 |
| 31 | Delphi Ventures | Series A | 1 | 1 | 1 | Dec 2025 | 41 | |
| 32 | New Form Capital | New York City, United States | Series A | 1 | 1 | 1 | Dec 2025 | 27 |
| 33 | Desai Accelerator | Ann Arbor, United States | Seed | 1 | 1 | 1 | Jan 2017 | 21 |
| 34 | Contango | Toronto, Canada | Series A | 1 | 1 | — | Dec 2025 | 20 |
| 35 | Decasonic | Chicago, United States | Series A | 1 | 1 | 1 | Dec 2025 | 16 |
| 36 | RPS Ventures | Palo Alto, United States | Series B | 1 | 1 | — | Jun 2023 | 13 |
| 37 | Generative Ventures | London, United Kingdom | Series A | 1 | 1 | — | Dec 2025 | 14 |
| 38 | IncWell | Birmingham, United States | Series A | 1 | 1 | — | Mar 2015 | 11 |
| 39 | Auros | Hong Kong, China | Series A | 1 | 1 | — | Dec 2025 | 11 |
| 40 | Baboon | Series A | 1 | 1 | — | Dec 2025 | 10 | |
| 41 | 11 Tribes Ventures | Chicago, United States | Series A | 1 | 1 | — | Sep 2025 | 8 |
| 42 | Radar Capital | Toronto, Canada | Series D | 1 | 1 | — | Oct 2017 | 5 |
| 43 | Roll Tack Ventures | Series A | 1 | 1 | — | Sep 2025 | 2 | |
| 44 | UDHC | United States | Series A | 1 | 1 | — | Dec 2025 | 1 |
| 45 | Mercury | New York City, United States | Series A | 1 | 1 | 1 | Aug 2021 | 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.
Cybersecurity companies head-officed in Ann Arbor that took money from these investors.
| Company | Backers | Rounds | Disclosed | Latest round |
|---|---|---|---|---|
| Duo duo.com |
11 | 21 | $885M | Series D Oct 2017 |
| TestMachine testmachine.ai |
9 | 9 | $58.5M | Series A Dec 2025 |
| Censys censys.com |
8 | 21 | $741.7M | Series D Mar 2026 |
| Blumira blumira.com |
7 | 10 | $106.4M | Series B Jun 2023 |
| Interlink Networks interlinknetworks.com |
5 | 9 | $48.9M | Series A Jan 2005 |
| Circadian Risk circadianrisk.com |
5 | 6 | $24.6M | Series A Sep 2025 |
| Deepfield deepfield.com |
1 | 1 | $1.5M | Seed Sep 2011 |
| TowerSec tower-sec.com |
1 | 1 | — | Series A Mar 2015 |
| Date | Investor | Company | Stage | Round size |
|---|---|---|---|---|
| Mar 2026 | Greylock Partners | Censys | Series D | $40M |
| Mar 2026 | Morgan StanleyLED | Censys | Series D | $40M |
| Mar 2026 | Intel Capital | Censys | Series D | $40M |
| Mar 2026 | Google Ventures | Censys | Series D | $40M |
| Mar 2026 | Decibel | Censys | Series D | $40M |
| Dec 2025 | Generative Ventures | TestMachine | Series A | $6.5M |
| Dec 2025 | UDHC | TestMachine | Series A | $6.5M |
| Dec 2025 | BlockchangeLED | TestMachine | Series A | $6.5M |
| Dec 2025 | DecasonicLED | TestMachine | Series A | $6.5M |
| Dec 2025 | New Form CapitalLED | TestMachine | Series A | $6.5M |
| Dec 2025 | Contango | TestMachine | Series A | $6.5M |
| Dec 2025 | Auros | TestMachine | Series A | $6.5M |
| Dec 2025 | Baboon | TestMachine | Series A | $6.5M |
| Dec 2025 | Delphi VenturesLED | TestMachine | Series A | $6.5M |
| Sep 2025 | Roll Tack Ventures | Circadian Risk | Series A | $6M |
| Sep 2025 | Arthur VenturesLED | Circadian Risk | Series A | $6M |
| Sep 2025 | Tamiami Angel Funds | Circadian Risk | Series A | $6M |
| Sep 2025 | 11 Tribes Ventures | Circadian Risk | Series A | $6M |
| Feb 2024 | Tamiami Angel FundsLED | Circadian Risk | Series A | $565K |
| Oct 2023 | Ascension Ventures | Censys | Series C | $50M |
Cybersecurity investors in other cities
Other markets in Ann Arbor