From spreadsheet to Series A
A seed-stage maker of laboratory instruments went from a single spreadsheet to a model that carried a €6.2M Series A.
Client
Tarnbury Labs
Function
Finance
Year
2026
Engagement
Retainer
Duration
9 months
Situation
Tarnbury Labs had eleven people, two paying customers and one spreadsheet that only the founder understood. Investors liked the product and asked for a model they could trust. The founder had three weeks of patience and no finance hire.
Work
Linnea rebuilt the model from the bank statements up, one tab per question an investor asks. She set a monthly close, a thirteen-week cash view and a data room. Twice a week she rehearsed the hard questions with the founder until the answers were short.
Result
The model went to six investors and survived every diligence call. The round closed eleven weeks after the work began, and the company now closes its books in six working days.
The numbers
- €6.2M Series A closed
- 11 weeks Model to term sheet
- 24 months Runway after the round
Linnea turned a spreadsheet into a story investors could follow. We closed our Series A eleven weeks after she started.
—
Maud Ketterly
CEO, Tarnbury Labs