NFX is a $1.5B seed fund founded and led by serial founders who built 10 companies that exited for over $10B, and operates as "the venture firm we wish existed when we were founders" with a 45+ person platform team that runs like a startup rather than a traditional small partnership. The firm structures everything around network effects as its core thesis (backed by 15 years of internal research), builds proprietary software products including Signal (the #1 fundraising network with 100k+ users), and connects portfolio founders through an invite-only "Guild" community where 200-500+ CEOs share KPIs and insights to make each company stronger.