Alex Kleiner
Partner at Rubicon Technology Partners
New Haven, Connecticut
Alex Kleiner, Partner at Rubicon Technology Partners is an active investor based in New Haven, Connecticut. This profile covers what Alex Kleiner backs, at which stage, and how founders can reach out in 2026.
- Investor type
- VCPE
- Stages
- SeedSeries ASeries BLate Stage Venture
- Invests in
- SaaS & EnterpriseClimate & Energy
- Location
- New Haven, Connecticut
- Typical check
- $2M
- Past investments
- 9
Notable investments
Astute Solutions
Tendril
BrandMakerGimmalCin74tell Solutions
AudienceViewQSR InternationalHow to reach Alex Kleiner
Angels and operators like Alex Kleiner reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded Accelerator.
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Frequently Asked Questions
What does Alex Kleiner invest in?
Alex Kleiner invests in SaaS & Enterprise and Climate & Energy, typically at Seed, Series A, Series B and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Alex Kleiner invest at?
Alex Kleiner typically invests at Seed, Series A, Series B and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Alex Kleiner's typical check size?
Alex Kleiner typically writes checks around $2M. Use it as a signal for whether your raise fits their stage.
How do I contact Alex Kleiner?
Unlock Alex Kleiner's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.