Arch just made private markets impossible to ignore. The New York City-based platform locked in $52 million in Series B funding led by Oak HC/FT with Menlo Ventures, Craft Ventures, and Quiet Capital doubling down. Numbers like that don’t just show confidence, they show conviction. Matt Streisfeld of Oak HC/FT spelled it out, after diligence calls with clients, Arch wasn’t just another platform, it was the one clients wouldn’t stop talking about.
The origin story runs back to 2018, when Ryan Eisenman teamed up with MIT engineers Jason Trigg and Joel Stein to attack the mess no one wanted to fix. Private market investing was a minefield of portals, statements, K1s, and capital calls that made sophisticated investors feel like interns in a filing room. Eisenman saw inefficiency from his early work with advisors, Trigg and Stein brought the engineering chops, and Arch was born. Today, that idea has scaled into an AI-powered infrastructure layer for alternative investments, serving as the single source of truth for portfolios spread across venture, private equity, hedge funds, real estate, and private credit.
The numbers tell a story even louder than the pitch. Assets on the platform surged from $100 billion to more than $250 billion in just 14 months. Arch now supports over 450 allocators globally, with 150 single family offices, 100 RIAs and multifamily offices, four of the top 20 global banks, and seven of the top 20 accounting firms on its client roster. Over half the users refer the product to others, a metric that can’t be gamed, it signals trust, adoption, and retention.
The product innovation is as sharp as the growth. Arch Pay, their automated capital call system, takes what once required 5,500 clicks and compresses it into a seamless transfer with security baked in for auditors, lawyers, and regulators. Add integrations with Carta, Juniper Square, Addepar, and Black Diamond, and Arch has positioned itself as the Switzerland of private markets. Neutral, connected, and unavoidable.
The $52 million isn’t survival capital, it’s fuel to expand into institutional investors, larger wealth teams, and established family offices with complex portfolios. Eisenman frames Arch as the “Charles Schwab for private markets,” and considering alternatives are projected to balloon to $29.2 trillion by 2029, the runway is enormous. It’s not about tidying the mess, it’s about building the rails the market runs on.
