Portfolio Co Investors 2026 for Index: investors, rounds, and co-investor patterns from StartupFundraising.com research, updated for 2026.
Index accounts for 8 tracked companies with verified cap-table data, 8 of which disclose round sizes totalling $2.4B. The median disclosed raise is $143M, and the largest is ServiceTitan at $1.4B, ahead of Metromile ($282M) and Decagon ($231M).
The names that recur most often on these co-invested cap tables are Index (8 companies), Accel (2 companies), Bain Capital Ventures (2 companies), Coatue (2 companies), Bessemer Venture Partners (1 company), Dragoneer (1 company). By latest disclosed round, the market skews Series B (4), Series E (2), IPO (1), Series D (1).