Jack Mastrangelo net worth
Quick answer
Jack Mastrangelo's estimated net worth is $5.0M (range $3.5M – $7.5M) as of 2026. Jack Mastrangelo is Founder at Cobblestone. Cobblestone valuation.
Jack Mastrangelo is Founder at Cobblestone (YC W23). Independent Entrepreneurial Check model estimate from public YC data.
At a glance
- Company status: Acquired
- Region: United States of America
- Industries: Real Estate and Construction
- Team size: 3
- Website: https://getcobblestone.com
Who is Jack Mastrangelo?
Jack Mastrangelo is a founder at Cobblestone, a startup that participated in Y Combinator's Winter 2023 batch.
About Cobblestone
We're building software to help institutional landlords reduce delinquency starting with fraud reduction.
FAQ: Jack Mastrangelo net worth and Cobblestone valuation
What is Jack Mastrangelo's net worth?
Jack Mastrangelo's estimated net worth is $5.0M (range $3.5M – $7.5M) as of 2026. Jack Mastrangelo is Founder at Cobblestone. 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 Cobblestone valuation?
Cobblestone's estimated valuation on Entrepreneurial Check is $100.0M. 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 Jack Mastrangelo's role?
Jack Mastrangelo is Founder at Cobblestone, a Y Combinator-backed startup (batch W23).