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Washington Harbour Partners

1201 Wilson Blvd., 22nd Floor, Arlington, VA, 22209, United States

Overview

Washington Harbour Partners is an investment firm that deploys capital in the U.S. Washington Harbour Partners seeks to earn superior risk-adjusted returns for its investors over the long term. The firm’s fundamentally oriented investments focus primarily on the technology, media, communications, fintech, and business services sectors. The public equity efforts emphasize deep due diligence on individual companies using a private-equity approach. The private equity strategy targets growth-oriented private companies. Washington Harbour Partners LP was founded in 2019 and is based in the Washington D.C. area.

Total investments
31
Lead investments
10
Investments · 12mo
16
Active investors
6

Sector focus

  • Finance
  • Financial Services
  • FinTech
  • Impact Investing
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Investment portfolio

  • Hadrian

    Led · Series D · Aug 2026

    Hadrian builds automated manufacturing facilities that mass-produce parts for vehicles used by the military. The company has opened multiple facilities, including a fourth site in Alabama announced in March to produce submarine parts. That Alabama facility was structured as a public/private partnership and valued at $2.4 billion, according to Hadrian. Hadrian has attracted large venture and institutional backers and recently raised a $1.37 billion round at a $7.87 billion valuation. About a year earlier it raised a $260 million Series C led by Founders Fund and Lux Capital, bringing total capital raised to roughly $2 billion per PitchBook estimates. The company's current plans and financing indicate continued expansion of its automated production footprint for defense supply chains.

  • Mariana Minerals

    Participated · Series B · Aug 2026

    Mariana Minerals combines proprietary software and capital project execution to build and operate mines and refineries for critical minerals. Its MarianaOS platform integrates CapitalProjectOS, PlantOS and MineOS into a single AI and machine learning stack intended to compress multi-year project execution timelines and reduce commissioning time. The company operates active projects including Copper One, which is ramping toward 50,000 metric tons of refined copper per year, and Lithium One, a GWh-scale facility targeting commercial lithium production from oil & gas produced water in the first half of 2027. Mariana has raised roughly $400 million of parent and project capital to date, including the $310 million Series B. The company plans to scale to 10 commercial-scale projects in 10 years, using data from each project to improve its software and lower costs for subsequent builds.

  • NinjaOne

    Participated · Series C · Jun 2026

    Founded in 2013, NinjaOne offers a cloud-native platform that unifies remote monitoring, automated patch management, endpoint security, and data backup to manage laptops, servers, mobile devices, and cloud endpoints from a single dashboard. The platform manages millions of endpoints for over 24,000 customers globally, including Nvidia, Lyft, HelloFresh, Porsche, Cintas, and Vimeo. The company completed a $262M acquisition of Dropsuite to expand its cloud backup and data protection capabilities. NinjaOne is founder-led, carries no debt, and its founders retain majority equity and control. With proceeds from its latest financing, the company plans to accelerate R&D into autonomous endpoint management, automated vulnerability remediation, and AI-assisted helpdesk features. The article positions NinjaOne as competing against legacy incumbents like Kaseya and N-able and adjacent players such as JumpCloud and Atera.

  • Apex

    Led · Equity · Jun 2026

    Apex focuses on satellite manufacturing, including building satellite buses for different payloads. The company plans to use the proceeds from its latest funding to expand those manufacturing capabilities. Founded in 2022, Apex also participates in a collaboration on a missile defense project, indicating activity in the defense sector. Its valuation doubled to $2.3 billion following the recent raise of over $200 million. The article does not provide revenue, user metrics, or prior funding specifics.

  • Picogrid

    Participated · Series A · Jun 2026

    Picogrid builds hardware-enabled software products that connect sensors, unmanned platforms, and digital systems to enable unified control and data flow across land, sea, air, and space. The company provides an open integration layer and an ecosystem that now spans more than 100 defense systems from vendors such as Skydio, Northrop Grumman, Echodyne, CX2, and Neros. Led by CEO Zane Mountcastle and based in El Segundo, CA, Picogrid positions its solution as infrastructure for mission execution and operator interoperability across vendors. Following the $45M Series A, the company plans to expand its product family, extend integration into new operational domains, and scale deployments with the US military, allied forces, and partner vendors. The article did not disclose revenue, valuation, or other operating metrics beyond the ecosystem breadth.

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