At Index, the old guard of partners still dominate much of the dealmaking. Rimer led the investment in Discord, the chat platform that Bloomberg recently reported is confidentially pursuing an IPO. Mike Volpi, a longtime partner in San Francisco who retired from Index in 2023, led the investment in Scale AI, which sold a 49% stake to Meta last year. That delivered gains of $1.8 billion to Index, according to a person familiar with the figures. The firm’s other 2025 exits — in Nexthink, a Swiss software firm; Dream Games, a Turkish app developer; and Wealthfront Corp., a robo-advisor — all involved Volpi and the Rimer brothers, who collectively devised Index’s succession plan.