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
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Round Funded. "Alex Kleiner." Round Funded investor database, updated September 9, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/alex-kleiner
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 founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.