Fundraising Fox

Chestnut

YC X25

San Francisco, US · Founded 2025 · 2 employees · Hiring · 6 known investors

Chestnut Mortgage uses AI to automate document review, loan processing, and comparisons to reduce costs and timelines for residential mortgage borrowers. The company operates as a licensed mortgage lender in Texas and Colorado, typically closing loans in 2-3 weeks with rates approximately 0.5% lower than industry standards.

Also known as Detta

AI & Machine LearningFintechPropTechReal EstateConsumerAIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (X25)

Chestnut was founded in 2025 by Spencer Brown.

SBSpencer Brown
Spencer Brownin𝕏Founder2025–2026Spencer Brown previously built a mortgage lending system that processed 2% of annual US mortgages. He has worked as an engineer at multiple early-stage startups and is now building an AI-driven mortgage lending platform.

Investors · 6

Y Combinator✓ verifiedSan Francisco · $500K
Neer Venture Partners$25K – $500K
Olive Tree CapitalBoston
DBL Partnersreported · 2 sourcesPalo Alto

Also in the syndicate · 2

Canada Pension Plan Investment BoardCloverlay

Funding

SEC filings, press & company announcements
  • Undisclosed amountSeries BSep 2025

    Canada Pension Plan Investment Board

    Source ↗
  • Undisclosed amountSeries BFeb 2025

    Canada Pension Plan Investment Board, Cloverlay, DBL Partners

    Source ↗

Source: company announcements and press reports — follow each round's link for the claim.

Competitors · 3

by search overlap
Own Up29 shared keywordsOwn Up is a mortgage advisory platform that uses technology to help homebuyers evaluate lenders, understand affordability, and compare loan offers. The company serves consumers seeking mortgages or refinancing options with transparent, objective guidance aligned with their interests rather than the lender's.
Chase28 shared keywordsA wealth management and investing service (J.P. Morgan Wealth Management via Chase) offering self-directed brokerage accounts with commission-free online trades as well as one-on-one advisor services, financial planning tools, and retirement accounts. It serves individual retail investors ranging from beginners to experienced investors in the United States.
LendEDU26 shared keywordsLendEDU publishes educational resources and comparative reviews to help consumers make informed financial decisions about loans, mortgages, and other financial products. The company earns revenue from affiliate partnerships with financial service providers featured on its platform.

Companies competing with Chestnut for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

Causeartistcauseartist.com · Sep 2025Chestnut Carbon raises $250 million in record Series B for carbon removal - ImpactAlphaimpactalpha.com · Sep 2025Chestnut Carbon Raises A Quarter Billion In Series B After An Additional Funding Round | Chestnut Carbonchestnutcarbon.com · Sep 2025Chestnut Carbon Raises an Additional $90 Million for Series Bprnewswire.com · Sep 2025Chestnut, the first AI mortgage lenderycombinator.com · May 2025Chestnut Raises $160 Million to Scale Farm-to-Forest Carbon Removal Projects - ESG Todayesgtoday.com · Feb 2025Startup Chestnut Raises $160 Million for Forest Carbon Removal - Bloombergbloomberg.com · Feb 2025

Frequently asked questions

What does Chestnut do?
Chestnut Mortgage uses AI to automate document review, loan processing, and comparisons to reduce costs and timelines for residential mortgage borrowers. The company operates as a licensed mortgage lender in Texas and Colorado, typically closing loans in 2-3 weeks with rates approximately 0.5% lower than industry standards.
Who founded Chestnut?
Chestnut was founded by Spencer Brown in 2025.
Who are Chestnut's investors?
Chestnut's investors include Y Combinator, Neer Venture Partners, Olive Tree Capital, DBL Partners.
Where is Chestnut headquartered?
Chestnut is headquartered in San Francisco, US.