Portfolio Companies 2026 for Altos Ventures: investors, rounds, and co-investor patterns from StartupFundraising.com research, updated for 2026.
Altos Ventures accounts for 36 tracked companies with verified cap-table data, 36 of which disclose round sizes totalling $42B. The median disclosed raise is $91M, and the largest is Medistream at $37B, ahead of Toss Payments ($1.2B) and Toss Bank ($844M).
The names that recur most often on these portfolio cap tables are Altos Ventures (36 companies), Y Combinator (5 companies), FJ Labs (3 companies), Techstars (3 companies), Kleiner Perkins (2 companies), Goodwater Capital (2 companies). By latest disclosed round, the market skews Series B (12), Series C (8), Series D (3), Series F (2).
Companies tracked: 36
Disclosed funding total: $42B across 36 companies
Median disclosed raise: $91M
Largest raise: Medistream — $37B
Stage mix: Series B 12 · Series C 8 · Series D 3 · Series F 2
