Jonathan Leifer, Principal at L3C Capital Partners is an active investor based in New York, United States. This profile covers what Jonathan Leifer backs, at which stage, and how founders can reach out in 2026.
Chairman and Founder of L3C Capital Partners.
Jonathan Leifer typically invests at Series A and Series B.
- Investor type
- Investment Partner
- Stages
- Series ASeries B
- Location
- New York, United States
- Typical check
- $2M
How to reach Jonathan Leifer
Angels and operators like Jonathan Leifer 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.
Reach active investors like this one
About this profile
This profile is part of Round Funded, an investor database and outreach platform for founders. It covers 60,000+ active VCs, angels, family offices and accelerators with verified contacts, lets you send pitches from your own Gmail, and includes a free Data Room for your raise. How this data is built.
Cite this page
Round Funded. "Jonathan Leifer." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/jonathan-leifer
Frequently Asked Questions
Who is Jonathan Leifer?
Jonathan Leifer, Principal at L3C Capital Partners is an active investor based in New York, United States. Jonathan Leifer typically invests at Series A and Series B.
What stage does Jonathan Leifer invest at?
Jonathan Leifer typically invests at Series A and Series B. Lead with traction that fits the stage when you reach out.
What is Jonathan Leifer's typical check size?
Jonathan Leifer 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.