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FiftySix Investments
Rothrock founded FiftySix Investments in 2014 after two and a half decades at Venrock, the Rockefeller family's technology venture arm.
FiftySix Investments
Rothrock founded FiftySix Investments in 2014 after two and a half decades at Venrock, the Rockefeller family's technology venture arm. His personal capital, earned through 53 early-stage Venrock investments that produced eight IPOs including CloudFlare and a CEO stint at cybersecurity firm RedSeal, funds the firm. Rothrock's nuclear engineering roots — a Master's from MIT, a start at Yankee Atomic Electric — anchor the firm's energy focus. He sees seed-stage cyber and climate as a single, interlocked thesis around infrastructure resilience. FiftySix writes seed checks into companies securing energy systems and digital networks. The portfolio spans data-protection software, advanced fission and fusion hardware, and grid-reliability platforms. Rothrock often steps beyond capital, coaching founders through Series A decks and connecting them to his deep Rolodex of late-stage venture contacts. The firm's website names positions in over fifty startups; public board seats at Check Point Software Technologies and Centrus Energy offer a proxy for its dual cyber-nuclear mandate. Geographically, the firm invests across North America from its Silicon Valley base. The firm remains a solo operation — Rothrock is the named decision-maker. He complements proprietary investing with advisory roles, serving as a venture partner at Shield Capital in Burlingame, California. Rothrock spent over a decade on the board of $70B endowment UTIMCO, stepping down in July 2024. This institutional governance experience, combined with his former chairmanship of the National Venture Capital Association, gives FiftySix's seed-stage portfolio companies a rare policy-aware investor. What distinguishes FiftySix is its founder's operating template: a career venture capitalist who also served as a public-company CEO and actively drafts regulatory frameworks for advanced nuclear reactors. Rothrock helped conceive the action plan that ultimately shaped the NRC's licensing modernization efforts. Few seed funds embed a board-level cyber and nuclear specialist who simultaneously negotiates reactor regulations and chairs NASDAQ-listed audit committees.
General information
Firm type
Private Equity
Year founded
2014
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Silicon Valley
Corporate office
Silicon Valley, CA, United States
Principals
Ray Rothrock
Managing Partner
Sector focus
Frequently asked questions
Who runs investment decisions at FiftySix Investments?
Ray Rothrock makes all investment decisions. He sources deals, structures seed rounds, and personally coaches founders on their Series A narratives. The firm does not employ an investment committee beyond Rothrock himself.
How does FiftySix Investments source proprietary deal flow?
Rothrock leverages a network built over three decades: his Venrock alumni connections, his directorships at Check Point Software Technologies and Roku, and his nuclear-energy advocacy work through organizations like the Nuclear Threat Initiative and Terra Praxis. Many founders reach him through the cybersecurity and advanced-reactor policy community rather than traditional venture channels.
Is FiftySix structured as a family office or a venture fund?
FiftySix is best understood as a personal investment vehicle conducting direct seed-stage venture deals. Rothrock formed it in 2014 using his own capital, and there is no evidence of outside limited partners. It does not carry the regulatory reporting profile of a registered investment advisor.
What investment stages does FiftySix target?
The firm deploys at the seed stage exclusively. Rothrock's pattern is to enter early enough to influence company formation, then help the founding team refine their pitch and syndicate for a Series A round. He does not lead later-stage rounds nor participate in growth equity.
What is Rothrock's posture on co-investments alongside external venture firms?
Rothrock actively syndicates. His biography notes he assists entrepreneurs with access to his extensive venture capital network, and his role as a venture partner at Shield Capital positions him to route follow-on capital to portfolio companies. He participates in LP advisory committees for other venture firms.
Does FiftySix participate in fund commitments or only direct deals?
The disclosed activity shows exclusively direct seed investments. While Rothrock sits on LP advisory committees for other venture firms, FiftySix is not described as committing capital to external funds as a limited partner.
Where does the underlying wealth for FiftySix Investments come from?
Rothrock's capital was generated during 25 years at Venrock, where he led 53 early-stage investments yielding eight IPOs — notably Check Point Software Technologies and CloudFlare — and from his subsequent role as CEO of RedSeal. He was twice named to the Forbes Midas List.
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