ThirdStream Partners LLC is a venture capital firm founded in 2014 and based in San Mateo, California. See sector focus and contact routes.
ThirdStream Partners LLC is a venture capital firm founded in 2014 and based in San Mateo, California, that makes principal investments in financial technologies (FinTech) and financial services. The firm targets venture and strategic opportunities across a broad spectrum of stages, from early-stage startups to later-stage private companies, with a portfolio focus on Series A rounds followed by Seed and Series B investments. While specific check sizes are not publicly disclosed, the firm’s latest tracked deal was a $4.7M Seed investment in OneAM in October 2025, suggesting participation in early-stage rounds. OneAM is a notable portfolio company, and the firm has 6 tracked investments across 6 companies, though most other named portfolio firms are not publicly identified in available sources. ThirdStream Partners operates as a principal investor providing both capital and strategic support to help FinTech companies scale, emphasizing solutions with genuine market disruption potential. The firm does not appear to publish distinctive public writing or a unique point of view beyond its stated mission to support the next generation of financial technolog
This profile is part of the StartupFundraising firm database: focus, portfolio history, disclosed location and contact routes, refreshed as new filings and rounds are ingested. Founders use it to check fit before reaching out and to find comparable investors.
Investors like ThirdStream Partners LLC · Full investor directory · Investor access · Company funding database