Ken Book Net Worth (Estimated)
Founder at Fluid Markets · YC W23
Quick answer
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026.
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.
Model inputs
- Stage: seed
- Valuation tier: fallback-seed
- Valuation note: no_discovery_sources [scale: $500k-class amount looked like a YC check, not a published seed]
- Research as-of: 2026-08-04
- Funding input: no public raise amount found; stage fallback valuation
FAQ: Ken Book net worth and Fluid Markets valuation
What is Ken Book's net worth?
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026. Entrepreneurial Check publishes an independent model-based estimate from public company and role data.
Ken Book net worth
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026. This Ken Book net worth figure is estimated paper wealth, not a verified statement of assets.
How much is Ken Book worth?
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026. How much Ken Book is worth here means estimated paper wealth from public company and role data — not financial advice.
How rich is Ken Book?
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026. “How rich is Ken Book” here means estimated paper wealth from public company and role data — not verified net worth or financial advice.
Ken Book fortune
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026. This Ken Book fortune figure is estimated paper wealth only, not a verified statement of assets.
Ken Book equity value
Ken Book's estimated net worth / paper wealth is $10.0M (range $7.0M–$15.0M) as of 2026. Ken Book equity value on this page is modeled paper wealth from estimated ownership — not a disclosed cap table or verified net worth.
What is Fluid Markets valuation?
Fluid Markets's estimated valuation on Entrepreneurial Check is $20.0M. Independent model output, not a verified appraisal or official mark.
What is Fluid Markets post-money valuation?
Fluid Markets's estimated valuation on Entrepreneurial Check is $20.0M. That figure is a modeled post-money mark when a public raise is available — not a verified appraisal or official mark.
What is Fluid Markets funding?
Fluid Markets funding, when a public raise is available, is a model input on this Entrepreneurial Check profile. How much Fluid Markets raised is not a complete cap table — figures are estimates only.
How much did Fluid Markets raise?
How much Fluid Markets raised, when disclosed, informs the estimated Fluid Markets valuation and founder paper-wealth figures on this page. Independent estimate only — not a complete cap table or financial advice.
How much money did Fluid Markets raise?
How much money Fluid Markets raised, when a public figure is available, is a model input for the estimated Fluid Markets valuation on this profile. Estimates only — not a complete cap table.
What is Fluid Markets series funding?
Fluid Markets series funding, when a public raise is disclosed, informs the estimated Fluid Markets valuation here. Not a complete financing history.
What company is Ken Book building?
Ken Book is Founder at Fluid Markets, a Y Combinator-backed startup (batch W23).
What does Fluid Markets do?
Fluid Markets — Invest in public companies KPIs
What YC batch is Ken Book from?
Ken Book is associated with Y Combinator batch W23.
Where is Ken Book based?
Public directory data lists Ken Book's region as United States of America.
What industry is Ken Book in?
Ken Book is listed under Fintech, Banking and Exchange.
How big is Fluid Markets?
Public data lists Fluid Markets's team size as 3.
What else is notable about Ken Book?
Y Combinator W23.
Is Entrepreneurial Check affiliated with Y Combinator?
No. Entrepreneurial Check is an independent informational site and is not affiliated with, endorsed by, or sponsored by Y Combinator or the profiled companies.