Portfolio Co Investors 2026 for Alta Partners: investors, rounds, and co-investor patterns from StartupFundraising.com research, updated for 2026.
Alta Partners accounts for 19 tracked companies with verified cap-table data, 19 of which disclose round sizes totalling $2.7B. The median disclosed raise is $85M, and the largest is EGenesis at $481M, ahead of BridgeHealth ($450M) and DispatchHealth ($417M).
The names that recur most often on these co-invested cap tables are Alta Partners (19 companies), Longwood Fund (4 companies), General Catalyst (3 companies), Domain Associates (3 companies), Lux Capital (2 companies), Leaps by Bayer (2 companies). By latest disclosed round, the market skews Series A (7), Series D (5), Series B (5), Series E (1).
Companies tracked: 19
Disclosed funding total: $2.7B across 19 companies
Median disclosed raise: $85M
Largest raise: EGenesis — $481M
Stage mix: Series A 7 · Series D 5 · Series B 5 · Series E 1
