Investor profile
Stefan Klestil
Accelerator, Venture capital & Investor and Board observer at Primer, General Partner Sif at Speedinvest
Stefan Klestil is an Investor and Board observer at Primer, whose known portfolio counts 17 companies.
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Investment focus
Contacts
Affiliated funds' portfolios
Investor and Board observer at Primer, whose known portfolio counts 17 companies
- DailyPay
- Hummingbirds
- Athira Pharma
- Aardvark
- Acticor Biotech
- MatriSys Bioscience
- Bendit
- Finology
- Nelo
- Ending Study Cafe
- Bomchan
- Botkin.AI
- and 5 more
General Partner Sif at Speedinvest, whose known portfolio counts 13 companies
- Eunice
- Flinn
- Tower.dev
- BLOCKS
- Saúde Bliss
- Rival
- Bindbridge
- Complyance
- Rivia
- Diligent
- Haz
- Polaron
- and 1 more
Investor Profile
The listing covers sectors AI, Commerce, Consumer and FinTech, and focus areas Analytics, Biotech, Cloud Infrastructure and Data. Startups operating in these areas may find Stefan Klestil relevant.
Primer appears in Pre-Seed, Seed and Series A rounds across its known deals.
The firm portfolio and the focus above give founders context on whether Stefan Klestil matches their raise.
Colleagues
Showing 20 of 36
Douglas Guen
Founder & CEO
Seoul, South Korea
Anthony Danon
Investor
London, United Kingdom
Deepali Nangia
Partner
London, United Kingdom
Fred Kranich
Limited Partner
Vienna, Austria
Kiha Lee
Venture Partner
San Francisco, United States
Florian Gschwandtner
Investor
Linz, Austria
Frederik Hagenauer
Partner
London, United Kingdom
Rob Moffat
Board Director
London, United Kingdom
Sameer Singh
Partner
London, United Kingdom
Markus Lang
General Partner
Berlin, Germany
Will Wells
AI Founder turned frontier tech VC
London, United Kingdom
Marie-Helene Ametsreiter
General Partner
Germany
Heinrich Gröller
Venture Partner
Vienna, Austria
Sonali De Rycker
Board Member
London, United Kingdom
Andrea Zitna
Partner
United Kingdom
Werner Zahnt
Partner
Austria
Samir Kaul
Investor
Menlo Park, United States
Daniel Keiper-Knorr
General Partner
Austria
Michael Mueller
Chairman of Speedinvest f (fintech)
Vienna, Austria
Markus Wagner
Venture Partner / Investment Committee Si I
Palo Alto, United States
Frequently asked questions
Who is Stefan Klestil?
Stefan Klestil is an accelerator partner and venture capital investor based in Austria, listed as Investor and Board observer at Primer. The known portfolio of that firm counts 17 companies. That portfolio belongs to the firm, not to Stefan Klestil personally.
What does Stefan Klestil invest in?
Listed sectors include AI, Commerce, Consumer and FinTech; listed focus areas include Analytics, Biotech, Cloud Infrastructure and Data. Those tags come from the portfolios of the firms this profile is attached to, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Stefan Klestil invest at?
Primer appears in Pre-Seed, Seed and Series A rounds across its known deals, and Stefan Klestil is listed there as Investor and Board observer. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Stefan Klestil listed at?
Stefan Klestil is listed as Investor and Board observer at Primer. 36 other people in the database share a firm with Stefan Klestil.
How do I contact Stefan Klestil?
An email address, a phone number and a LinkedIn page are on file for Stefan Klestil. The address stays masked on this page and is readable inside RaiseHunt after you create an account.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal