Graham Brooks is a Partner.406 Ventures, a Boston-based early-stage venture firm. See sector focus and contact routes.
Graham Brooks is a Partner at.406 Ventures, a Boston-based early-stage venture firm, where he has worked since 2007 after starting as an Associate and advancing through Senior Associate and Principal roles. He leads the firm’s Data + AI practice, targeting highly disruptive, platform, and deep tech companies, with a focus on enterprise software, cybersecurity, data infrastructure, and healthcare IT. His typical investment check ranges from $2M to $5M, spanning seed to Series B stages, and he often supports B2B and healthcare SaaS startups expanding into large enterprise or regulated markets. Brooks has led or served on the boards for over 20 investments, including notable portfolio companies such as Portrait Analytics, Linea Labs, ClosedLoop, and Reltio. He also runs the firm’s Student Fellows program, which engages college and university students in venture outreach. While no public writing or distinctive point of view is explicitly cited in available sources, his operational focus on scalable enterprise solutions with strong technical foundations defines his investment approach.
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