Oak HC/FT
About Oak HC/FT
Venture and growth firm investing in fintech and healthcare technology.
Oak HC/FT was established in 2014 by Annie Lamont, Andrew Adams and Patricia (Tricia) Kemp. They are the firm's managing partners and had worked together since 2003 at Oak Investment Partners, a multi-stage venture firm. Fund I closed in June 2014 with $500M. Later funds were $600M, $800M, a $1.4B Fund IV in February 2021 and a $1.94B Fund V in July 2022. A 2025 pension board document describes Fund VI as targeting about $2.0B with no hard cap. Oak describes itself as having over $7B in assets under management and more than 100 portfolio companies. The firm's site also features partners Vig Chandramouli, Matt Streisfeld (General Partner) and Nancy Brown, who has spoken publicly about AI in health tech.
Oak does not run a separate AI fund. It backs AI inside its two sectors, healthcare and fintech. Its public AI deals include a model lab and a company building training environments for financial work. Annie Lamont commented on Fundamental's round and has discussed AI with Andrew Adams in press interviews. Fundamental builds a large tabular model, called Nexus, for predictions from enterprise structured data. Oak led its Series A, announced in February 2026. In 2026 Oak also led a $30M Series A in Halluminate, which builds simulated environments and benchmarks that test AI models on financial tasks. Oak's site also lists a $122M Series D for Blue J led by Oak and Sapphire Ventures.
Oak says it works with companies from seed to growth. Oak has not published a check size range for its current funds. PitchBook's description of the 2014-era fund gives $15M to $35M for earlier-stage ventures and $5M to $50M for growth-stage companies. TechCrunch reported in 2021 that Fund IV would invest across about 20 companies with average check sizes of $60M to $100M. Treat these figures as historical, not current guidance.
- Fundamental: AI lab behind the Nexus large tabular model. It raised $255M in total, including a $225M Series A led by Oak, Valor Equity Partners, Battery Ventures and Salesforce Ventures (February 2026).
- Halluminate: San Francisco startup building training environments and benchmarks for AI on financial work. Oak led its $30M Series A in 2026, which brought total funding to $38.5M.
- Blue J: Oak and Sapphire Ventures led a $122M Series D, listed on Oak's site (year not confirmed).
- pa.gov/content/dam/copapwp-pagov/en/psers/documents/board3/resolutions
- techcrunch.com/2021/02/24/oak-hc-ft-1-4-billion
- oakhcft.com/news/oak-hc-ft-closes-fifth-fund-at-1-94-billion-continuin
- debevoise.com/news/2022/07/debevoise-advises-oak-hc
- techcrunch.com/2026/02/05/fundamental-raises-255-million-series-a-with
- businesswire.com/news/home/20260205966141/en/Fundamental-Announces-$25
- oakhcft.com/news/fundamental-announces-255m-in-funding-and-publicly-la
- oakhcft.com/company/fundamental
Investing activity
Oak HC/FT appears in 2 AI deals tracked by the AI Lounge deals desk, rounds totalling $285M, and led 2 of them. The rounds are mostly Series A, with a median round size of $255M. The most recent are Halluminate (Series A, $30M, Oct 2026) and Fundamental (Series A, $255M, Feb 2026).
Oak HC/FT most often invests alongside Salesforce Ventures and Valor Equity Partners, and the companies it backs on AI Lounge are mostly in AI evaluation environments (finance) and Foundation models for data.
Deals
Frequently asked questions about Oak HC/FT
Does Oak HC/FT invest in AI startups?
Yes, within healthcare and fintech. Oak led Fundamental's Series A in February 2026 and Halluminate's $30M Series A in 2026.
Who founded Oak HC/FT?
Annie Lamont, Andrew Adams and Patricia Kemp founded it in 2014. They had worked together at Oak Investment Partners since 2003.
How big are Oak HC/FT's funds?
Fund I was $500M and Fund IV was $1.4B. Fund V closed at $1.94B in 2022, and Fund VI was reported in 2025 as targeting about $2.0B.
What check size does Oak HC/FT write?
The firm has not published a current range. Older reports cite $15M to $35M for early-stage and $5M to $50M for growth-stage deals, and TechCrunch reported average checks of $60M to $100M for Fund IV.
Does Oak HC/FT invest in seed and early-stage companies?
Yes. Oak says it invests from seed to growth, and it led Series A rounds in Fundamental and Halluminate. Its focus is companies in healthcare and fintech.
What AI companies has Oak HC/FT invested in?
Oak HC/FT's AI investments include Halluminate and Fundamental. The 2 rounds on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is Oak HC/FT based?
Oak HC/FT is based in Stamford, US.
What stage does Oak HC/FT invest at?
In the rounds tracked on AI Lounge, Oak HC/FT has invested at Series A, with a median round of $255M. Oak HC/FT led 2 of those rounds.
Who does Oak HC/FT co-invest with?
Oak HC/FT's most frequent co-investors on AI Lounge are Salesforce Ventures (1 deal) and Valor Equity Partners (1 deal).
How can founders reach Oak HC/FT?
Founders on AI Lounge can see Oak HC/FT's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Oak HC/FT to their Investor Pipeline to track the conversation.