Javier Villamizar
About Javier Villamizar
Javier Villamizar is based in Miami, Florida. NFX Signal and Crunchbase list him as an Operating Partner at SoftBank Investment Advisers. Crunchbase lists his title as Partner, Joint Ventures and Portfolio Synergies at SoftBank Vision Fund, a role it dates to August 2018. Some press coverage of the Subquadratic round describes him as a former SoftBank Vision Fund executive, so founders should confirm his current affiliation.
His operating roles include Interim CEO at Open English and board seats at Wellhub and DigitalReef, per NFX Signal. Crunchbase also shows a past board role at Creditas, an advisory board seat at NEXA (from January 2020) and a role as Executive Partner at Connexa Capital.
He holds a B.S. in Electronics Engineering from Pontificia Universidad Javeriana and an MBA in International Business from the University of Miami. NFX lists him in the Kauffman Fellows network.
His LinkedIn headline describes him as an angel investor and a Web3, crypto and blockchain believer. NFX Signal ranks him in pre-seed Web3/Crypto and Web3/Blockchain. NFX Signal also lists him as an investor in Flowbo (Y Combinator), HTwenty, Belo, Runway Health, Payflow (YC S21), Asteya, SenseiNode and Lightshift. Investment dates and amounts for these are not public in the sources reviewed.
Subquadratic announced a $29M seed round in May 2026. Press coverage names Villamizar among the investors, alongside Justin Mateen, Grant Gittlin and Jaclyn Rice Nelson, plus early investors in Anthropic, OpenAI, Stripe and Brex. Crunchbase records his participation in the round on May 5, 2026 and does not name a lead investor.
Subquadratic is an AI research company building long-context large language model architectures. It launched SubQ 1M-Preview alongside the round.
NFX Signal gives an investment range of $100K to $5.0M with a $1.5M sweet spot. This is a third-party profile, not a statement from him, and it may reflect his SoftBank role rather than personal angel checks. His listed investments skew to pre-seed and seed, with a Latin America connection through Open English, Belo and HTwenty. He has not published a thesis for AI investing that we could find.
- Subquadratic: long-context LLM architecture research company; participated in its $29M seed, announced May 2026.
- Payflow (YC S21): listed by NFX Signal as an investment; year not public.
- Flowbo (Y Combinator): listed by NFX Signal as an investment; year not public.
- Runway Health: listed by NFX Signal as an investment; year not public.
- Belo: listed by NFX Signal as an investment; year not public.
- HTwenty: listed by NFX Signal as an investment; year not public.
- signal.nfx.com/investors/javier-villamizar
- crunchbase.com/person/javier-villamizar
- pulse2.com/subquadratic-29-million-seed-raised-for-long-context-ai-arc
- llmreference.com/researcher/subquadratic
- linkedin.com/today/author/jvillamizar
- crunchbase.com/organization/nexa-mobility
- crunchbase.com/organization/streamlined-ventures/investor_summary/over
Investing activity
Javier Villamizar appears in 1 AI deal tracked by the Lounge deals desk, rounds totalling $29M. The rounds are mostly Seed, with a median round size of $29M. The most recent is Subquadratic (Seed, $29M, May 2026).
Javier Villamizar most often invests alongside Ullas Naik, Streamlined, JAM Fund and Justin Mateen, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Javier Villamizar
Who is Javier Villamizar?
He is a Miami-based executive and investor. NFX Signal and Crunchbase list him as an Operating Partner at SoftBank Investment Advisers. He has also served as Interim CEO of Open English and sat on boards including Wellhub.
Has Javier Villamizar invested in AI startups?
Yes. He was named among the investors in Subquadratic's $29M seed round, announced in May 2026. Subquadratic builds long-context large language model architectures.
What check size does Javier Villamizar write?
He has not stated a check size publicly in the sources we found. NFX Signal lists a $100K to $5.0M range with a $1.5M sweet spot. Treat that as a third-party estimate.
What stage does Javier Villamizar invest in?
NFX Signal ranks him in pre-seed Web3 categories. His listed investments include Y Combinator companies and a seed-stage AI company, which points to early stage.
How can founders contact Javier Villamizar?
He is on LinkedIn and X, and NFX Signal lists the personal site jvillamizar.com. A warm introduction through a shared investor or portfolio founder is the route most likely to work.
Is Javier Villamizar an angel investor?
Yes. Javier Villamizar invests personally as an angel.
What AI companies has Javier Villamizar invested in?
Javier Villamizar's AI investments include Subquadratic. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Javier Villamizar invest at?
In the rounds tracked on Lounge, Javier Villamizar has invested at Seed, with a median round of $29M.
Who does Javier Villamizar co-invest with?
Javier Villamizar's most frequent co-investors on Lounge are Ullas Naik (1 deal), Streamlined (1 deal), JAM Fund (1 deal), Justin Mateen (1 deal) and Brex (1 deal).
How can founders reach Javier Villamizar?
Founders on Lounge can see Javier Villamizar's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with them under Warm Paths, and add Javier Villamizar to their Investor Pipeline to track the conversation.