Washington Harbour Partners
Arlington, Virginia, United StatesFounded 2019
Defense & SpaceAIManufacturingConsumerHardware & SemiconductorsHealthcareDeveloper ToolsClimate & EnergyFintech
Washington Harbour Partners is a private investment firm that focuses on opportunistic investing in small and mid-cap companies across private equity, growth equity, and public equities. Their strategy emphasizes non-cyclical sectors such as tech-enabled services, government IT, defense technology, software, and cybersecurity, often partnering with companies providing mission-critical solutions to the U.S. government.
38% of their portfolio is in Defense & Space. Deal activity increased 1200% year-over-year (13 deals in the last 12 months). Average disclosed round size is $176.3M (across 12 rounds with reported amounts).
Portfolio
16
Fund Size
$1.6B
Top Stage
Series B
Last 12 Mo
13
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
16 investments
| Company | Round | Amount | Date |
|---|---|---|---|
| SStriveworks | Series B | — | Mar 2026 |
 Worldscape.ai | Seed | — | Mar 2026 |
| Worldscape.ai | Seed | — | Mar 2026 |
 VulcanForms | Series D | $220M | Jan 2026 |
| NNorthwood | Series B | $100M | Jan 2026 |
 Northwood Space | Series B | $100M | Jan 2026 |
 Array Labs | Series A | $20M | Jan 2026 |
 Trusted Space | Unknown | — | Dec 2025 |
 Medallion | Series C | $43M | Aug 2025 |
 Rune Technologies | Series A | $24M | Jul 2025 |
 Firestorm Labs | Series A | $47M | Jul 2025 |
| SStandard Nuclear | Series B | $42M | Jun 2025 |
 Apex | Series C | $200M | Apr 2025 |
 Epirus | Series D | $250M | Mar 2025 |
 Red 6 | Series B | $70M | Jun 2023 |
 Shield AI | Growth | $1B | — |
Top Co-Investors
Andreessen Horowitz6 shared
Point72 Ventures2 shared
Scout2 shared
Radius Capital2 shared
8VC2 shared
Catapult Ventures1 shared
KOMPAS VC1 shared
Y Combinator1 shared
Animal Capital1 shared
Cultivation Capital1 shared
Human Ventures1 shared
XYZ Venture Capital1 shared
Gaingels1 shared
General Dynamics Land Systems1 shared
Sequoia Capital1 shared
Spark Capital1 shared
aCrew1 shared
GV (Google Ventures)1 shared
NFDG1 shared
RedBird Capital1 shared
Last updated: 16 April 2026