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The Cosine Group
The Cosine Group is a discreet San Francisco and New York-based family office with no public portfolio, principals, or AUM disclosed.
The Cosine Group
The Cosine Group maintains offices in San Francisco and New York, indicating a structural footprint typical of a technology-oriented family office — West Coast for venture and startup access, East Coast for financial markets and institutional relationships. No founding year or wealth-origin narrative has been publicly disclosed, which is itself a distinguishing characteristic: the firm operates without a website, LinkedIn presence, or public relations trace. Without public disclosures, its investment strategy can only be inferred from its geography and entity type. Dual-coastal single family offices in this configuration typically allocate across venture capital, growth equity, real assets, and public markets. No portfolio companies, fund commitments, or co-investment partners have been named in any public record, making the deployment thesis — and its scale — entirely opaque. The firm's team size, organizational structure, and decision-making hierarchy are not publicly documented. No adjacent vehicles, philanthropic foundations, club memberships, or operating businesses are linked to The Cosine Group in available records. This absence of secondary entities is notable; many family offices of similar geography establish DAFs or foundations, making the silence here either a privacy posture or a signal of lean operations. The Cosine Group's structural differentiator is its radical discretion. In an era where family offices increasingly signal sophistication through content marketing, LP dinners, and co-investment networks, this firm has chosen complete opacity. That choice may reflect a specific principal's security requirements, a concentrated single-asset wealth origin where publicity offers no advantage, or a deliberate strategy of sourcing through private, bilateral relationships rather than branded intermediation.
General information
Firm type
Single Family Office
Year founded
—
AUM
Undisclosed
Location
Region
North America
Country
United States
City
San Francisco
Corporate office
San Francisco, CA and New York, NY, United States
Frequently asked questions
Who runs investment decisions at The Cosine Group?
No principals or investment decision-makers are publicly identified. The firm maintains no website, LinkedIn page, or regulatory filings that name individual operators. This degree of privacy is rare and suggests either a single-principal structure or a deliberate strategy to avoid personal attribution in public records.
How does The Cosine Group source deals?
Sourcing mechanisms cannot be confirmed. Given its lack of public presence, it is likely that deal flow is entirely relationship-driven — through private networks in San Francisco and New York — rather than through inbound pitch decks, investment banks, or visible LP commitments. The absence of a website or marketing footprint supports this inference.
Where does the underlying wealth come from?
The wealth origin has not been publicly disclosed. The firm's dual-office structure in San Francisco and New York is consistent with technology-derived wealth, but no corporate liquidity event, inheritance, or other source has been linked to the entity in any public record.
Is The Cosine Group structured as a single family office or a multi-family office?
Available evidence points to a single family office, given the absence of any marketing to external families, client-facing materials, or multi-family registration. However, without public statements, a definitive classification is not possible. The level of discretion makes it unlikely to be soliciting outside capital.
Does The Cosine Group maintain philanthropic structures?
No philanthropic foundation, donor-advised fund, or charitable vehicle is publicly linked to The Cosine Group. This is notable given the prevalence of philanthropy among peer family offices in San Francisco and New York, and may indicate either a privacy preference or a philanthropic structure held under a different name.
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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