Dalton Caldwell, the longest-serving partner at Y Combinator, is leaving the Silicon Valley accelerator to launch a new venture capital fund alongside fellow veteran partner Paul Buchheit and two additional co-founders, according to multiple reports on 12 June. Forbes said the pair intend to create a vehicle dedicated to Series A investments that will nurture early-stage startups. Further details, including the fund’s name, size and first close, have not yet been made public. Y Combinator leadership and alumni—including Chief Executive Officer Garry Tan, former CEO Michael Seibel and co-founder Jessica Livingston—publicly endorsed the move, saying Caldwell and Buchheit’s experience guiding hundreds of companies positions them to influence the competitive Series A market.