Jack Mastrangelo Net Worth (Estimated)

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.

Model inputs

• Stage: acquired
• Valuation tier: fallback-acquired
• 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: Jack Mastrangelo net worth and Cobblestone valuation

What is Jack Mastrangelo's net worth?

Jack Mastrangelo's estimated net worth / paper wealth is $5.0M (range $3.5M–$7.5M) as of 2026. Entrepreneurial Check publishes an independent model-based estimate from public company and role data.

Jack Mastrangelo net worth

Jack Mastrangelo's estimated net worth / paper wealth is $5.0M (range $3.5M–$7.5M) as of 2026. This Jack Mastrangelo net worth figure is estimated paper wealth, not a verified statement of assets.

How much is Jack Mastrangelo worth?

Jack Mastrangelo's estimated net worth / paper wealth is $5.0M (range $3.5M–$7.5M) as of 2026. How much Jack Mastrangelo is worth here means estimated paper wealth from public company and role data — not financial advice.

How rich is Jack Mastrangelo?

Jack Mastrangelo's estimated net worth / paper wealth is $5.0M (range $3.5M–$7.5M) as of 2026. “How rich is Jack Mastrangelo” here means estimated paper wealth from public company and role data — not verified net worth or financial advice.

Jack Mastrangelo fortune

Jack Mastrangelo's estimated net worth / paper wealth is $5.0M (range $3.5M–$7.5M) as of 2026. This Jack Mastrangelo fortune figure is estimated paper wealth only, not a verified statement of assets.

Jack Mastrangelo equity value

Jack Mastrangelo's estimated net worth / paper wealth is $5.0M (range $3.5M–$7.5M) as of 2026. Jack Mastrangelo equity value on this page is modeled paper wealth from estimated ownership — not a disclosed cap table or verified net worth.

What is Cobblestone valuation?

Cobblestone's estimated valuation on Entrepreneurial Check is $100.0M. Independent model output, not a verified appraisal or official mark.

What is Cobblestone post-money valuation?

Cobblestone's estimated valuation on Entrepreneurial Check is $100.0M. That figure is a modeled post-money mark when a public raise is available — not a verified appraisal or official mark.

What is Cobblestone funding?

Cobblestone funding, when a public raise is available, is a model input on this Entrepreneurial Check profile. How much Cobblestone raised is not a complete cap table — figures are estimates only.

How much did Cobblestone raise?

How much Cobblestone raised, when disclosed, informs the estimated Cobblestone valuation and founder paper-wealth figures on this page. Independent estimate only — not a complete cap table or financial advice.

How much money did Cobblestone raise?

How much money Cobblestone raised, when a public figure is available, is a model input for the estimated Cobblestone valuation on this profile. Estimates only — not a complete cap table.

What is Cobblestone series funding?

Cobblestone series funding, when a public raise is disclosed, informs the estimated Cobblestone valuation here. Not a complete financing history.

What company is Jack Mastrangelo building?

Jack Mastrangelo is Founder at Cobblestone, a Y Combinator-backed startup (batch W23).

What does Cobblestone do?

Cobblestone — Delinquency reduction and automation software for institutional…

What YC batch is Jack Mastrangelo from?

Jack Mastrangelo is associated with Y Combinator batch W23.

Where is Jack Mastrangelo based?

Public directory data lists Jack Mastrangelo's region as United States of America.

What industry is Jack Mastrangelo in?

Jack Mastrangelo is listed under Real Estate and Construction.

How big is Cobblestone?

Public data lists Cobblestone's team size as 3.

What is Cobblestone's status?

Cobblestone is listed as Acquired in public company data.

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.