Behind the Scenes at Fortune's 40 Under 40 Party in San Francisco

Each fall, two weeks or so after the release of our new 40 Under 40 list, Fortune toasts the new class at a big party in San Francisco, where many of the honorees are based.

We’ve held our event at the headquarters of buzzy tech startups like Zynga and Airbnb. This year, on October 7, the bash was at GitHub headquarters, hosted by GitHub’s CEO Chris Wanstrath, who made the new list. More than half of our new 40 showed up to party—below are some shots from the event. On first mention, we’ve identified new members of the list (as well as list alums) with their full titles and companies.

Take a look, and then look back at this year’s full 40 Under 40.

Virtru co-founder Will Ackerly, Soulcycle CEO Melanie Whelan, Bank of America managing director Karen Fang, Virtru CEO John Ackerly. Photograph by Drew Alitzer

Alan Murray, Alliance Consumer Growth partner Trevor Nelson, Karen Fang, FitBit CEO James Park. Photograph by Drew Alitzer

Facebook head of security Alex Stamos hits the photo booth. Photograph by Robyn Twomey

Daniel Roberts, Leigh Gallagher, Xiaomi Global VP Hugo Barra, Alan Murray. Photograph by Drew Alitzer

Adam Lashinsky, Ruth Kirschner, Ron Conway. Photograph by Drew Alitzer

Emil Michael, Shervin Pishevar, Scott Stanford, Eventbrite president Julia Hartz, Guest, Molly Graves, Uber head of global ops Ryan Graves. Photograph by Drew Alitzer