Yucatan Rock Ventures

Investment decisions are made by the two co-founders, Stephen G. Pearse and Robert G. Pearse. Stephen was the founder and CEO of Cyras Systems, the optical networking startup whose sale to Ciena generated the family's core wealth. Robert serves on the boards of multiple public companies, including Star Equity Holdings. There is no known external investment committee.

The firm's sourcing network is anchored in the telecommunications and optical networking ecosystem that surrounded Cyras Systems and Ciena. This technical alumni network, combined with the Pearse family's relationships in deep-tech and applied-science circles, produces a referral-heavy pipeline that bypasses the traditional venture capital auction process. The firm does not market itself publicly to deal sources.

The firm's primary investment activity appears to be direct early-stage equity into private technology companies, based on available public records. The Pearse family's charitable vehicles, including support for the Hertz Foundation and the Foundation for Energy Security and Innovation, represent indirect commitments to translational research, but these are grant-making structures rather than LP fund commitments.

Yucatan Rock targets seed and Series A rounds, with a stated focus on early-stage and startup companies. The firm's charter permits holding positions well beyond typical venture fund liquidity windows, so early-stage check-writing can extend into later-stage support without the fundraising friction a traditional manager would face.

The wealth originated from Stephen Pearse's sale of Cyras Systems to Ciena Corporation. The deal closed in March 2001 and was valued at approximately $2.6 billion in Ciena stock. Cyras had developed high-capacity optical switching equipment for telecommunications carriers, and the acquisition was a landmark deal in the pre-bubble optical networking sector.

Yucatan Rock operates as the Pearse family's direct investment office, deploying proprietary capital with no external limited partners and no requirement to return capital on a fund-cycle timeline. While its investment activity overlaps with early-stage venture capital, the structure is definitively a family office rather than an institutional venture fund.

The Pearse family is associated with the Hertz Foundation, which funds doctoral fellowships in the applied physical and biological sciences, and the Foundation for Energy Security and Innovation. These are separate legal entities from Yucatan Rock Ventures, though they reflect the family's long-duration view on applied-science capital allocation.