Mark Xu

Mark is a Partner at Index Ventures, investing across all stages in cybersecurity, infrastructure, and AI. He looks to partner with technical founders who demonstrate exceptional degrees of domain expertise, hustle, and customer obsession. Since joining Index, Mark has backed and partnered closely with founders building at the frontier of AI, including Flapping Airplanes, Simile, Fireworks, Parallel, and 7AI. Prior to Index, he was a growth investor at Lightspeed, where he supported companies like Wiz, Glean, and Grafana. He studied mathematics, economics, and computer science at Harvard and before that played violin at Juilliard.