Portfolio Co Investors 2026 for Slack Fund: investors, rounds, and co-investor patterns from StartupFundraising.com research, updated for 2026.
Slack Fund accounts for 8 tracked companies with verified cap-table data, 8 of which disclose round sizes totalling $908M. The median disclosed raise is $70M, and the largest is Lattice at $330M, ahead of Nylas ($175M) and Pitch ($135M).
The names that recur most often on these co-invested cap tables are Slack Fund (8 companies), Thrive Capital (2 companies), Tiger Global (2 companies), Atomico (2 companies), Khosla Ventures (1 company), Marc Benioff (1 company). By latest disclosed round, the market skews Series B (5), Series C (2), Series A (1).