Ralph Stemler
Angel and VC Investor, Advisory for High-Tech Partner Ecosystems at Self-Employed
Vienna, Vienna
Ralph Stemler, Angel and VC Investor, Advisory for High-Tech Partner Ecosystems at Self-Employed is an active investor based in Vienna, Vienna. This profile covers what Ralph Stemler backs, at which stage, and how founders can reach out in 2026.
Ralph Stemler is an angel and VC investor and advisor to startups in enterprise software, AI, and renewable energy, with extensive experience in high-tech ecosystems.
Ralph Stemler invests in SaaS & Enterprise, Climate & Energy and Artificial Intelligence, typically at Pre Seed, Seed and Series A.
- Investor type
- AngelVC
- Stages
- Pre SeedSeedSeries A
- Invests in
- SaaS & EnterpriseClimate & EnergyArtificial Intelligence
- Location
- Vienna, Vienna
- Typical check
- $250K
How to reach Ralph Stemler
Angels and operators like Ralph Stemler 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. "Ralph Stemler." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/ralph-stemler
Frequently Asked Questions
Who is Ralph Stemler?
Ralph Stemler, Angel and VC Investor, Advisory for High-Tech Partner Ecosystems at Self-Employed is an active investor based in Vienna, Vienna. Ralph Stemler invests in SaaS & Enterprise, Climate & Energy and Artificial Intelligence, typically at Pre Seed, Seed and Series A.
What does Ralph Stemler invest in?
Ralph Stemler invests in SaaS & Enterprise, Climate & Energy and Artificial Intelligence, typically at Pre Seed, Seed and Series A. Match your sector and stage, then reach out with a personalized pitch.
What stage does Ralph Stemler invest at?
Ralph Stemler typically invests at Pre Seed, Seed and Series A. Lead with traction that fits the stage when you reach out.
What is Ralph Stemler's typical check size?
Ralph Stemler typically writes checks around $250K. 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.