Pebblebed is a San Francisco-based early-stage venture capital firm founded in 2022 by experienced technologists, including former Facebook AI Research founder Keith Adams and OpenAI founding engineer Pamela Vagata. The firm focuses on backing technical founders who are solving technically rigorous problems, often referred to as "self-protecting ideas" that are simple to state but challenging to execute. They invest in foundational infrastructure, AI systems, machine learning, and other cutting-edge technologies, aiming to support startups that can build strong market positions and enduring customer relationships. Pebblebed emphasizes a hands-on approach, working closely with portfolio companies to provide mentorship, guidance, and support.