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Ophir CG
Sean O'Sullivan's hybrid investment firm spans enterprise software, industrial tech, and real estate from California and London.
Ophir CG
The O'Sullivan brothers founded Ophir CG, operating it as a private investment firm from its main office in Pleasant Hill, California, with additional locations in Santa Monica, San Francisco, and London. The firm's origins are tied directly to the family's technology and operating experience, structuring a vehicle designed to hold assets across cycles rather than conform to standard fund-life constraints. This patient-capital posture has defined its identity since inception. Ophir CG deploys across three distinct asset classes: venture capital, primarily targeting enterprise software and industrial technology companies at early to growth stages; direct real estate, with a focus on value-add and opportunistic properties; and operating businesses within industrial tech. The firm has maintained a low public profile, but its venture portfolio has included names such as NetCentric and other software infrastructure businesses. Its geographic footprint spans the West Coast of the United States and the United Kingdom, with the London office supporting European deal flow and real asset acquisition. Professional headcount and total deployment remain undisclosed, reflecting the firm's deliberate opacity. The Santa Monica and San Francisco offices augment its Bay Area–centric network, while the London presence provides a permanent base for cross-border transactions. The firm does not publicly advertise a philanthropic foundation or structured co-investment club, operating instead through its own holding-company-style architecture. Structurally, what sets Ophir CG apart from a conventional venture firm is its hybrid mandate: recycling liquidity from maturing real estate and industrial holdings back into early-stage technology deals — effectively a private, cross-asset, permanent-capital engine. This design eliminates the fundraising cycle pressure that shapes behavior at most venture and private equity managers, aligning the firm's timeline with that of the underlying founders and operators it backs.
General information
Firm type
Asset Manager
Year founded
—
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Pleasant Hill
Corporate office
Pleasant Hill, CA, United States
Additional offices
Santa Monica, CA · San Francisco, CA · London, United Kingdom
Principals
Sean O'Sullivan
Co-Founder & Managing Director
Brian O'Sullivan
Co-Founder & Managing Director
Sector focus
Frequently asked questions
Who runs investment decisions at Ophir CG?
Co-founders Sean O'Sullivan and Brian O'Sullivan serve as Managing Directors and direct the firm's investment activities. Sean O'Sullivan's background includes technology operations and venture investing, while the brothers jointly oversee the allocation across venture, real estate, and industrial technology. Day-to-day decisions are made within a flat partnership structure rather than a large, tiered investment committee typical of institutional fund managers.
How is Ophir CG structured as an investment firm — is it a fund or a family office?
Ophir CG operates as a private investment firm using a permanent-capital model rather than a series of blind-pool funds. It does not publicly identify as a single-family office, though its capital base originates with the founding principals. The structure resembles a hybrid holding company that recycles proceeds across venture capital, real estate, and industrial operating businesses without the fixed liquidation timelines that govern traditional private equity funds.
What investment stages does Ophir CG typically target in its venture portfolio?
The firm has historically focused on early-stage and growth-stage enterprise software and industrial technology companies. Specific stage boundaries are not publicly disclosed, but investments have spanned from seed to later-stage rounds in portfolio companies such as NetCentric and other software infrastructure businesses. The firm's permanent-capital structure allows it to hold positions beyond the typical venture fund lifecycle when warranted.
Does Ophir CG invest outside the United States?
Yes. In addition to its three California offices in Pleasant Hill, Santa Monica, and San Francisco, Ophir CG maintains a London presence that sources European opportunities. The firm's real estate and venture activities have included cross-border transactions, particularly in the United Kingdom, where the London office provides a permanent base for asset acquisition and portfolio company support.
How does Ophir CG's real estate strategy intersect with its venture capital activity?
The two strategies are operationally distinct but financially linked through the firm's internal capital-allocation framework. Real estate holdings, which have included value-add and opportunistic properties, generate cash flows and liquidity events that can be redirected into venture-stage technology investments. This cross-asset recycling is a defining feature of the firm's architecture and reduces dependence on external fundraising.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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