Ken Book net worth
Quick answer
Ken Book's estimated net worth is $10.0M (range $7.0M – $15.0M) as of 2026. Ken Book is Founder at Fluid Markets. Fluid Markets valuation.
Ken Book is Founder at Fluid Markets (YC W23). Independent Entrepreneurial Check model estimate from public YC data.
At a glance
- Company status: Active
- Region: United States of America
- Industries: Fintech, Banking and Exchange
- Team size: 3
- Website: https://fluidinvesting.com
Who is Ken Book?
Ken Book is a co-founder of Fluid Markets, a company focused on market access technologies launched during Y Combinator's Winter 2023 batch.
Highlights:
- Y Combinator W23
- Fluid Markets
About Fluid Markets
Fluid Markets was the first company to attempt to build futures markets on public company KPIs with the legal structure now known as prediction markets.
FAQ: Ken Book net worth and Fluid Markets valuation
What is Ken Book's net worth?
Ken Book's estimated net worth is $10.0M (range $7.0M – $15.0M) as of 2026. Ken Book is Founder at Fluid Markets. Entrepreneurial Check publishes an independent model-based estimate from public company and role data. Not verified net worth, and Entrepreneurial Check is not affiliated with Y Combinator or the profiled companies.
What is Fluid Markets valuation?
Fluid Markets's estimated valuation on Entrepreneurial Check is $20.0M. That valuation, or a disclosed round when one is public, is the source for the paper-wealth estimate. Independent model output — not a verified appraisal or official mark.
What is Ken Book's role?
Ken Book is Founder at Fluid Markets, a Y Combinator-backed startup (batch W23).