Jack Lembeck is an RGI at Ruttenberg Gordon Investments, whose known portfolio counts 10 companies.
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Investment focus
- Sector
- AIReal Estate
- Focus
- AI InfrastructureCritical Minerals
Contacts
Affiliated funds' portfolios
RGI at Ruttenberg Gordon Investments, whose known portfolio counts 10 companies
- Perplexity
- Apptronik
- Cambium
- Impulse Space
- Masa
- AGEMICA
- Deep Glow
- Gatehouse Capital Partners
- LiveOne
- Marcus Bar & Grille
Investor Profile
Founders in the listed sectors AI and Real Estate, and focus areas AI Infrastructure and Critical Minerals fall inside that listing.
Ruttenberg Gordon Investments appears in Growth, Late-Stage and Seed rounds across its known deals.
The firm portfolio and the focus above give founders context on whether Jack Lembeck matches their raise.
Colleagues at Ruttenberg Gordon Investments
Frequently asked questions
Who is Jack Lembeck?
Jack Lembeck is a private equity investor and venture debt investor based in Boca Raton, Florida, United States, listed as RGI at Ruttenberg Gordon Investments. The known portfolio of that firm counts 10 companies. That portfolio belongs to the firm, not to Jack Lembeck personally.
What does Jack Lembeck invest in?
Listed sectors include AI and Real Estate; listed focus areas include AI Infrastructure and Critical Minerals. Those tags come from the portfolios of the firms this profile is attached to, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Jack Lembeck invest at?
Ruttenberg Gordon Investments appears in Growth, Late-Stage and Seed rounds across its known deals, and Jack Lembeck is listed there as RGI. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Jack Lembeck listed at?
Jack Lembeck is listed as RGI at Ruttenberg Gordon Investments. One other person in the database shares a firm with Jack Lembeck.
How do I contact Jack Lembeck?
A LinkedIn page is on file for Jack Lembeck. It is readable inside RaiseHunt after you create an account. The database holds no email address and no phone number for this profile.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal