Investors / United States / 4Catalyzer
4Catalyzer
Investor · Guilford, CT, United States · North America
4Catalyzer is a venture studio that incubates and accelerates startups, uniting founders, resources, and talent. It builds companies at the intersection of medicine, engineering, and artificial intelligence, including Butterfly Network, Hyperfine, and Quantum-Si.
Invests inHealthcare & BiotechAI & Machine Learning
In its own wordshealthcarelife sciencesmedical devicesartificial intelligenceventure studiodiagnostics
Your fit with 4Catalyzer
Four questions about your startup
See how your round matches what it backs, point by point.
Or find every investor that fits4Catalyzer lists 8 checked portfolio companies on its own site. Its largest themes are Healthcare & Biotech (75%) and AI & Machine Learning (25%). 75% of its companies are based in United States. It invests most often alongside Foresite Capital, Altium Capital and Collaborative Fund.
No funding round on record names 4Catalyzer yet, so the figures come from its portfolio page.
Investor profile
percentile among all firmsShow as a table
| Measure | Percentile of all firms | Value |
|---|---|---|
| Portfolio size | 15th | 8 companies |
| Recent activity | 46th | 0 rounds in 12 months |
| Early stage | 54th | 0% of entries at pre-seed or seed |
| Evidence | 52th | 0% of companies confirmed by a round |
| Sector focus | 93th | 75% in its largest sector |
| Reach | 42th | 2 countries |
Its portfolio companies
where they are based, and what their own sites showSite status
- Site answers8100%
- No longer answers00%
- Points to another company00%
- Parked or sold domain00%
A site that stops answering three checks in a row is counted as no longer answering; that is not proof of closure. A site that points to another company is often an acquisition.
Investment themes
share of its checked companiesThis firmAll checked companies
Show as a table
| This firm | All checked companies | |
|---|---|---|
| Healthcare & Biotech | 75% | 15% |
| AI & Machine Learning | 25% | 18% |
Co-investor network
who it backs companies with, and who they back togetherAll co-investors or Compare portfolios with Foresite Capital
Compare 4Catalyzer head to head
portfolio size, rounds, entry stages, themes and the companies both backThree or more firms at once: portfolio overlap.
Portfolio
8 companies checked against their own sites| Company | What it does | Themes | First round with it | Evidence |
|---|---|---|---|---|
| Butterfly brings the power of ultrasound into your assessment, diagnosis and treatment | Healthcare & Biotech | Portfolio page | ||
| The company develops AI powered drones for the frontline | AI & Machine LearningAI & Machine Learning | Portfolio page | ||
| Detect is developing a scalable point-of-care platform designed to deliver high-performance molecular diagnostics | Healthcare & Biotech | Portfolio page | ||
| Hyperfine develops and provides a portable MRI system for brain imaging | Healthcare & Biotech | Portfolio page | ||
| The company develops a platform for retinal imaging and AI-powered diagnostics | Healthcare & Biotech | Portfolio page | ||
| Portfolio page | ||||
| Protein Evolution provides solutions for enzyme problems using AI-powered discovery and engineering | Healthcare & Biotech | Portfolio page | ||
| Quantum-Si develops and provides single-molecule protein sequencing solutions | Healthcare & Biotech | Portfolio page |
About this data
site last read 8 Nov 2026- Site
- 4catalyzer.com
- Last read
- 8 Nov 2026
- Watching since
- 5 Nov 2026
- Companies checked
- 8
Rates come from what VCinfo has observed since observation_start. Firms tend to remove companies that closed, so early rates understate reality. A company leaving a portfolio page does not mean it closed or exited. An unreachable site means our checks failed, nothing more.
Get 4Catalyzer's profile as data
Pull 4Catalyzer's portfolio, co-investors and changes through one API key or MCP, open every portfolio row, compare it with other firms, and get an email when it adds a company or files a fund.
Work email, sign-in link by email. Already have an account? Log in- Ask AI5 plain-English investor searches a day
- Full listsEvery portfolio row and two-firm overlap
- API and MCP100 REST or MCP calls a month, one key
- AlertsFollow 5 investors for portfolio and fund changes
$ curl -H "X-API-Key: YOUR_KEY" \
https://api.vcinfo.io/v1/firms/4catalyzer.com
# also
GET /v1/firms/4catalyzer.com/portfolio
GET /v1/firms/4catalyzer.com/coinvestors
GET /v1/firms/4catalyzer.com/news