Atheneum Capital is a family office - single based in Norwalk, United States, founded in 2005. Verified contact details, AUM data, and investment preferences on FindLPs.
Atheneum Capital LLC, was founded by Richard Rankin in 2005, based in Norwalk, Connecticut. The firm specializes in providing growth capital to early-stage enterprises. The firm prefers to invest in the life sciences, green energy, and technology sectors. The company's activities include principal investments in public and private companies, often providing vital growth capital to earlier-stage enterprises. - Holding company/single family office engaged in public and private equity investments - Focused on but not limited to renewable energy, healthcare, technology, and consumer product sectors - Sum of completed transactions in excess of $300mm; thus far 2 exits by IPO - Committed to cultivating enduring and rewarding relationships with partners and colleagues
Investment types: Venture Capital - Early Stage, Growth Capital, Direct Investing, Long/Short Equity, Investment Funds
Sectors & themes: Infrastructure, Hedge Funds, Digital Technology, Green Energy (Solar, Wind, Hydropower), Biomedical Technology & Medical Research, Startups & Management, High-Level Sectors, High-Level Investing, Finance, Alternative Investments, Technology, Emerging Technology, Energy, Clean Technology & Renewable Energy, Healthcare & Life Sciences, Biotechnology & Life Sciences, Healthcare, Renewable Energy, Renewables, ESG & Sustainability
Preferred geographies: United States
Location: 535 Connecticut Avenue\nSuite 201A Rowayton\nNorwalk\nConnecticut\n06853\nUnited States
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LP firm data compiled from public regulatory filings (SEC Form ADV, FCA, AIFMD disclosures), company websites and press releases, LinkedIn public profiles, and verified outbound email testing. AUM figures reflect self-reported values from filings and may lag by 1–2 fiscal quarters; bands are normalized in USD. We do not publish personal residential information; firms or individuals may request removal at /contact. Methodology & sources · Updated July 2026.