WestRiver Management LLC

WestRiver Management LLC

WestRiver Management was founded in 2007 by Jeff Hussey, who built and sold F5 Networks to private equity for $2.6 billion in 2010 (per public record). The family office was established prior to the F5 sale, meaning Hussey began deploying capital through the vehicle while still operating his company. The office operates from its Seattle headquarters, with a secondary office in San Francisco. The firm's investment strategy spans venture capital, real estate, and private credit. WestRiver has made direct investments in enterprise software, cybersecurity, and AI/ML companies, with a known emphasis on the Pacific Northwest ecosystem. The office also commits to external funds and participates in co-investments alongside select venture capital firms (per public record). Geographic focus is primarily North America, with a concentration in Washington State and California. WestRiver typically employs around a dozen professionals across both offices. The firm maintains venture capital partnerships and has been an active limited partner in Seattle-area venture funds. In 2023, WestRiver was reported to have increased its direct-deal deployment, though exact deployment figures remain undisclosed (per public record). The office also holds real estate assets in the Puget Sound region. A structural differentiator of WestRiver is its origin from operating-company wealth — Hussey built F5, not from inherited capital. The office operates with a concentrated mandate, investing across venture and private credit while maintaining a real estate portfolio. Its Seattle base gives it particular access to technology company deal flow in a market where many family offices are clustered.