Startup
Billow AI
An AI-native accounting firm rather than a software vendor: Billow connects to a company's NetSuite, QuickBooks and 80-plus other systems and runs month-end close, reconciliations, AP and budget commentary with agents.
| Founded | 2026, San Francisco; Y Combinator Summer 2026 batch |
|---|---|
| Founders | Jonathan McIntosh (CEO; previously built and exited an accounting/ERP platform), Philip Moniaga (CTO; ex-Bloomberg, Booking.com, repeat YC founder) |
| Stage | Seed / Y Combinator |
| Total funding | Not disclosed beyond YC |
| What it does | Outsourced accounting delivered by agents: close, reconciliation, accounts payable, accrual estimates, budget-versus-actuals |
| Traction | Signed Series B to D companies worth over $1bn in enterprise value within three months |
| Pricing | Not published; service pricing |
| Markets | US |
| Peers | Basis, Pilot, Kick |
Why it matters
Billow is an accounting firm delivered by AI agents, connecting to NetSuite, QuickBooks and more than 80 other systems. Founded in 2026 and backed by Y Combinator, it signed Series B to D companies representing over $1 billion in enterprise value in its first three months.
Updated September 2026.
Part of Accountio’s accounting technology coverage.
