Jonathan Pierce

Before founding Finwren, Jonathan spent six years inside CFO offices as an FP&A consultant — at a private equity-backed industrial distributor, two regional healthcare systems, and a technology services firm. In every close cycle, the pattern was the same: skilled analysts spending two full days reconstructing variance pivots from raw GL exports before they could write a single line of board narrative.

The problem was not the analysts. It was the workflow. Month-end actuals arrive as flat files — account strings, period columns, budget-vs-actual rows — that require hours of reshaping before the variance story becomes visible. The attribution work, connecting a budget deviation to a specific line-item driver, was done manually every month by every team.

Jonathan built the first version of Finwren in 2021: a Python script that read a standard P&L export and surfaced the top variance drivers automatically, with a driver label and a recommended question for the department head. That script ran for the first client before the company had a name.

The current product handles multi-entity consolidations, working capital scanning, and board narrative generation — and delivers the attribution pass in the same session as the actuals export. Finwren is bootstrapped and does not take outside capital. It is not a full FP&A platform, a financial modeling tool, or an ERP replacement. It does one job well: it tells you what moved in the close and why, before the deck is due.

Finwren is based in New York's Financial District — 55 Water Street, one block from the CFO offices we serve.