Justin Mateen

Justin Mateen accounts for 7 tracked companies with verified cap-table data, 7 of which disclose round sizes totalling $720M. The median disclosed raise is $66M, and the largest is Taxfix at $330M, ahead of Proxy ($100M) and Fun ($76M).

The names that recur most often on these co-invested cap tables are Justin Mateen (7 companies), Founders Fund (3 companies), Y Combinator (3 companies), Manolo Atala (3 companies), Tiger Global Management (2 companies), Bond (2 companies). By latest disclosed round, the market skews Series B (3), Series A (2), Series D (1), Series C (1).

• Companies tracked: 7
• Disclosed funding total: $720M across 7 companies
• Median disclosed raise: $66M
• Largest raise: Taxfix — $330M
• Stage mix: Series B 3 · Series A 2 · Series D 1 · Series C 1
• Most recent dated round: 2026-01-01

Best funded Justin Mateen companies

1. Taxfix — $330M (latest: Series D)
2. Proxy — $100M (latest: Series B)
3. Fun — $76M (latest: Series A)
4. Conta Simples — $66M (latest: Series A)
5. Pento — $53M (latest: Series B)
6. RelianceHMO — $48M (latest: Series B)
7. Norte Hash Technologies — $47M (latest: Series C)

Justin Mateen — related firms and companies (49)

• Taxfix
• Proxy
• Fun
• Conta Simples
• Pento
• RelianceHMO
• Norte Hash Technologies
• Justin Mateen portfolio companies 2026
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Justin Mateen profile · All research reports