Johan Brissmyr Net Worth (Estimated)

Who is Johan Brissmyr?

Johan Brissmyr is a founder at Castle, participating in Y Combinator's Winter 2016 batch.

Highlights:

• Stanford University
• Google
• Amazon

About Castle

Instantly stop automated and human-originated account takeovers, fake accounts, and any behavior that violates your platform policies.

Model inputs

• Stage: series-a
• Valuation tier: raise-10x
• Funding input: reported raise $9.2M
• Valuation note: Replace leftover $2M 2016 seed. Lock last published priced primary $9.2M Series A. Do not lock lifetime $11.6–11.7M or a Castle name-collision raise.
• Research as-of: 2026-09-14
• Funding source: https://blog.castle.io/weve-raised-9-2-million-led-by-index-ventures/

FAQ: Johan Brissmyr net worth and Castle valuation

What is Johan Brissmyr's net worth?

Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. Entrepreneurial Check publishes an independent model-based estimate from public company and role data.

Johan Brissmyr net worth

Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. This Johan Brissmyr net worth figure is estimated paper wealth, not a verified statement of assets.

How much is Johan Brissmyr worth?

Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. How much Johan Brissmyr is worth here means estimated paper wealth from public company and role data — not financial advice.

How rich is Johan Brissmyr?

Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. “How rich is Johan Brissmyr” here means estimated paper wealth from public company and role data — not verified net worth or financial advice.

Johan Brissmyr fortune

Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. This Johan Brissmyr fortune figure is estimated paper wealth only, not a verified statement of assets.

Johan Brissmyr equity value

Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. Johan Brissmyr equity value on this page is modeled paper wealth from estimated ownership — not a disclosed cap table or verified net worth.

What is Castle valuation?

Castle's estimated valuation on Entrepreneurial Check is $92.0M. Independent model output, not a verified appraisal or official mark.

What is Castle post-money valuation?

Castle's estimated valuation on Entrepreneurial Check is $92.0M. That figure is a modeled post-money mark when a public raise is available — not a verified appraisal or official mark.

What is Castle CEO net worth?

Johan Brissmyr is listed as CEO at Castle. Johan Brissmyr's estimated net worth / paper wealth is $16.7M (range $11.7M–$25.1M) as of 2026. This Castle CEO net worth figure is an independent paper-wealth estimate, not verified net worth.

What is Castle funding?

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

How much did Castle raise?

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

How much money did Castle raise?

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

What is Castle series funding?

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

What company is Johan Brissmyr building?

Johan Brissmyr is CEO at Castle, a Y Combinator-backed startup (batch W16).

What does Castle do?

Castle — Block bots & bad behavior

What YC batch is Johan Brissmyr from?

Johan Brissmyr is associated with Y Combinator batch W16.

Where did Johan Brissmyr go to school?

Public profiles associate Johan Brissmyr with Stanford University.

What other companies is Johan Brissmyr connected to?

Public associations for Johan Brissmyr include Google, Amazon.

Where is Johan Brissmyr based?

Public directory data lists Johan Brissmyr's region as United States of America.

What industry is Johan Brissmyr in?

Johan Brissmyr is listed under B2B, Security.

How big is Castle?

Public data lists Castle's team size as 20.

What else is notable about Johan Brissmyr?

Stanford University.

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.