John O Brien Jr

Portfolio Companies 2026 for John O Brien Jr: investors, rounds, and co-investor patterns from StartupFundraising.com research, updated for 2026.

John O Brien Jr covers 4 companies with a founder-verified check from John O Brien Jr, concentrated in Climate, Fintech. Round sizes are not disclosed for these companies, so this report lists the verified positions rather than dollar totals.

John O Brien Jr — verified positions

John O'Brien, Jr. — related firms and companies (56)

John O'Brien, Jr. profile · All research reports