Mark Andrus Net Worth (Estimated)
Founder at Onshore · YC W23
Quick answer
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026.
Mark Andrus is Founder at Onshore (YC W23). Independent Entrepreneurial Check model estimate from public YC data.
At a glance
- Company status: Active
- Region: United States of America
- Industries: B2B, Finance and Accounting
- Team size: 60
- Website: https://onshore.com
Who is Mark Andrus?
Mark Andrus is a founder associated with Onshore, a startup that was part of Y Combinator Winter 2023.
Highlights:
- Y Combinator
- Onshore
About Onshore
Onshore uses AI to prepare corporate R&D tax credits.
With our technology, anyone can prepare an R&D Tax Credit accurately and fast. To provide some background, the R&D Credit is often cited as the most complex and audited tax credit in the United States. With that in mind, we set out to create software to achieve two primary objectives:
- Ensure that any credit computed with our software is exactly what the...
Model inputs
- Stage: series-b
- Valuation tier: raise-10x
- Funding input: reported raise $31.0M
- Valuation note: Leftover $31M matches the first-party Series B. Do not lock lifetime $46M.
- Research as-of: 2026-09-14
- Funding source: https://onshore.com/blog/onshore-series-b
FAQ: Mark Andrus net worth and Onshore valuation
What is Mark Andrus's net worth?
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026. Entrepreneurial Check publishes an independent model-based estimate from public company and role data.
Mark Andrus net worth
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026. This Mark Andrus net worth figure is estimated paper wealth, not a verified statement of assets.
How much is Mark Andrus worth?
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026. How much Mark Andrus is worth here means estimated paper wealth from public company and role data — not financial advice.
How rich is Mark Andrus?
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026. “How rich is Mark Andrus” here means estimated paper wealth from public company and role data — not verified net worth or financial advice.
Mark Andrus fortune
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026. This Mark Andrus fortune figure is estimated paper wealth only, not a verified statement of assets.
Mark Andrus equity value
Mark Andrus's estimated net worth / paper wealth is $26.4M (range $18.4M–$39.5M) as of 2026. Mark Andrus equity value on this page is modeled paper wealth from estimated ownership — not a disclosed cap table or verified net worth.
What is Onshore valuation?
Onshore's estimated valuation on Entrepreneurial Check is $310.0M. Independent model output, not a verified appraisal or official mark.
What is Onshore post-money valuation?
Onshore's estimated valuation on Entrepreneurial Check is $310.0M. That figure is a modeled post-money mark when a public raise is available — not a verified appraisal or official mark.
What is Onshore funding?
Onshore funding, when a public raise is available, is a model input on this Entrepreneurial Check profile. How much Onshore raised is not a complete cap table — figures are estimates only.
How much did Onshore raise?
How much Onshore raised, when disclosed, informs the estimated Onshore valuation and founder paper-wealth figures on this page. Independent estimate only — not a complete cap table or financial advice.
How much money did Onshore raise?
How much money Onshore raised, when a public figure is available, is a model input for the estimated Onshore valuation on this profile. Estimates only — not a complete cap table.
What is Onshore series funding?
Onshore series funding, when a public raise is disclosed, informs the estimated Onshore valuation here. Not a complete financing history.
What company is Mark Andrus building?
Mark Andrus is Founder at Onshore, a Y Combinator-backed startup (batch W23).
What does Onshore do?
Onshore — AI for corporate tax
What YC batch is Mark Andrus from?
Mark Andrus is associated with Y Combinator batch W23.
Where is Mark Andrus based?
Public directory data lists Mark Andrus's region as United States of America.
What industry is Mark Andrus in?
Mark Andrus is listed under B2B, Finance and Accounting.
How big is Onshore?
Public data lists Onshore's team size as 60.
What else is notable about Mark Andrus?
Y Combinator.
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.