Mark Milastsivy Net Worth (Estimated)
Founder at Firstbase.io · YC W21
Quick answer
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026.
Mark Milastsivy is Founder at Firstbase.io (YC W21). Independent Entrepreneurial Check model estimate from public YC data.
At a glance
- Company status: Active
- Education: University of California, Berkeley
- Region: United States of America
- Industries: B2B, Operations
- Team size: 50
- Website: https://firstbase.io/
Who is Mark Milastsivy?
Mark Milastsivy is a founder at Firstbase.io, a company that simplifies the process of starting and running a business remotely.
Highlights:
- University of California, Berkeley
- Stripe
- Y Combinator W21
About Firstbase.io
Incorporation, compliance, bookkeeping, and taxes – all in one place.
Model inputs
- Stage: seed
- Valuation tier: arr-multiple
- Funding input: reported raise $3.0M
- ARR input: $20.3M
- Valuation note: Leftover $3M matches the first-party seed. Do not lock Firstbase.com $13M A, later notes, lifetime scrapes, or the Harbor sale.
- Research as-of: 2026-09-14
- Funding source: https://www.firstbase.io/blog/announcing-our-3m-seed-round
FAQ: Mark Milastsivy net worth and Firstbase.io valuation
What is Mark Milastsivy's net worth?
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026. Entrepreneurial Check publishes an independent model-based estimate from public company and role data.
Mark Milastsivy net worth
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026. This Mark Milastsivy net worth figure is estimated paper wealth, not a verified statement of assets.
How much is Mark Milastsivy worth?
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026. How much Mark Milastsivy is worth here means estimated paper wealth from public company and role data — not financial advice.
How rich is Mark Milastsivy?
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026. “How rich is Mark Milastsivy” here means estimated paper wealth from public company and role data — not verified net worth or financial advice.
Mark Milastsivy fortune
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026. This Mark Milastsivy fortune figure is estimated paper wealth only, not a verified statement of assets.
Mark Milastsivy equity value
Mark Milastsivy's estimated net worth / paper wealth is $203.0M (range $142.1M–$304.5M) as of 2026. Mark Milastsivy equity value on this page is modeled paper wealth from estimated ownership — not a disclosed cap table or verified net worth.
What is Firstbase.io valuation?
Firstbase.io's estimated valuation on Entrepreneurial Check is $203.0M. Independent model output, not a verified appraisal or official mark.
What is Firstbase.io post-money valuation?
Firstbase.io's estimated valuation on Entrepreneurial Check is $203.0M. That figure is a modeled post-money mark when a public raise is available — not a verified appraisal or official mark.
What is Firstbase.io funding?
Firstbase.io funding, when a public raise is available, is a model input on this Entrepreneurial Check profile. How much Firstbase.io raised is not a complete cap table — figures are estimates only.
How much did Firstbase.io raise?
How much Firstbase.io raised, when disclosed, informs the estimated Firstbase.io valuation and founder paper-wealth figures on this page. Independent estimate only — not a complete cap table or financial advice.
How much money did Firstbase.io raise?
How much money Firstbase.io raised, when a public figure is available, is a model input for the estimated Firstbase.io valuation on this profile. Estimates only — not a complete cap table.
What is Firstbase.io series funding?
Firstbase.io series funding, when a public raise is disclosed, informs the estimated Firstbase.io valuation here. Not a complete financing history.
What company is Mark Milastsivy building?
Mark Milastsivy is Founder at Firstbase.io, a Y Combinator-backed startup (batch W21).
What does Firstbase.io do?
Firstbase.io — The all-in-one startup operating system
What YC batch is Mark Milastsivy from?
Mark Milastsivy is associated with Y Combinator batch W21.
Where did Mark Milastsivy go to school?
Public profiles associate Mark Milastsivy with University of California, Berkeley.
What other companies is Mark Milastsivy connected to?
Public associations for Mark Milastsivy include Stripe.
Where is Mark Milastsivy based?
Public directory data lists Mark Milastsivy's region as United States of America.
What industry is Mark Milastsivy in?
Mark Milastsivy is listed under B2B, Operations.
How big is Firstbase.io?
Public data lists Firstbase.io's team size as 50.
What else is notable about Mark Milastsivy?
University of California, Berkeley.
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.