Jimmy Vaiopoulos
Co-founder and CFO @ Stack Capital
Jimmy Vaiopoulos is a private equity investor at Stack Capital focused on Energy and CleanTech. Jimmy Vaiopoulos - Co-founder and CFO @ Stack Capital
- Total investments:
- 1
- Lead investor:
- 100%
Last updated:
For AI agents: llms.txt
Industries Jimmy Vaiopoulos invests in
Stages Jimmy Vaiopoulos invests in
Countries Jimmy Vaiopoulos invests in
Investment Focus
Industry
- Energy 1 (100%)
- CleanTech 1 (100%)
- Clean Energy 1 (100%)
- Renewable Energy 1 (100%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
X-energy
|
X-Energy is a nuclear reactor and fuel design engineering company that develops Generation IV, high-temperature gas-cooled small modular reactors (SMRs) together with proprietary TRISO-X particle fuel. Their flagship reactor, the Xe-100, delivers about 80 MWe per unit and can be scaled in modular “packs” to reach higher output. X-Energy also buildsits own TRISO-X fuel to maintain supply control and quality. In addition, the company operates a plant support center to provide fleet monitoring, maintenance planning, training, and diagnostics for its reactor customers. | $5M / Private Equity |
About Stack Capital
Stack Capital Group offers long-term growth potential to innovative growth and late-stage private companies. It has the ability to invest in private companies from various sectors before they go public, as well as hold them as public companies.
Stack Capital Contacts
| Name | Phone | Socials | |
|---|---|---|---|
|
Jimmy Vaiopoulos
Co-founder and CFO
|
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Brian Viveiros
Co-Founder / VP, Corporate Development & Investor Relations
|
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Jason Meiers
CIO&Co-Founder
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Jeff Parks
Co-Founder - CEO
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1 more contact available
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FAQ
What does Jimmy Vaiopoulos invest in?
Jimmy Vaiopoulos invests primarily in Energy, CleanTech and Clean Energy startups, most often at Private Equity stage. Most of the 1 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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