Stefan Kalteis
Angel Investor @ Speedinvest
Stefan Kalteis is a seed investor at Speedinvest focused on Software and Travel. Stefan Kalteis
- Total investments:
- 8
- Last investment:
- Lead investor:
- 13%
Last updated:
For AI agents: llms.txt
Industries Stefan Kalteis invests in
Stages Stefan Kalteis invests in
Countries Stefan Kalteis invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $300k–$6.6M
Investment Focus
Industry
- Software 2 (25%)
- Travel 1 (13%)
- Tourism 1 (13%)
- Payments 1 (13%)
- Analytics 1 (13%)
Stage
- Seed 5 (63%)
- Pre-Seed 1 (13%)
Country
- Germany 2 (25%)
- Turkey 1 (13%)
- Austria 1 (13%)
- United Kingdom 1 (13%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Donnerstag.ai is an AI-powered centralized receivables management platform for suppliers that automates the reconciliation of services, credit notes, and payments. It aggregates data from various sources like ERP, EDI, Excel, and PDF, performs position-level matching to detect discrepancies, and provides real-time transparency on open items andcash flow. The system reduces manual work by automating recurring financial processes and integrates seamlessly with major ERP and accounting systems. | $4.6M / Seed / Nov 20, 2025 | ||
| Fraud0 is a software that renders uncontaminated analytics, automated non-human traffic, fraud and advertising detection solutions. | $6.6M / Seed / Aug 30, 2023 | ||
| Logistic operations still largely run on paper. It is almost impossible to track the vast majority of loads, receive delivery documents or measure how successful the operation is. Yolda.com is changing this with a strategic operating model that combines advanced tech and data analytics, logistics infrastructure, and hands-on supply chain expertise.Yolda.com combines the quality of cargo transportation with the diversity of haulier and the integrated service model of 3PL companies and offers a high-quality logistics experience by focusing on its customers. Yolda.com’s marketplace solution encompasses many local forwarders and logistics companies, enabling SMEs and corporate enterprises to receive an instant quote for multiple shipment requests on a single platform. Companies can also track their shipments via Yolda.com's intelligent control panel and measure their logistics operations performance with detailed reporting services. | $5M / Seed / Dec 13, 2021 | ||
| Logistic operations still largely run on paper. It is almost impossible to track the vast majority of loads, receive delivery documents or measure how successful the operation is. Yolda.com is changing this with a strategic operating model that combines advanced tech and data analytics, logistics infrastructure, and hands-on supply chain expertise.Yolda.com combines the quality of cargo transportation with the diversity of haulier and the integrated service model of 3PL companies and offers a high-quality logistics experience by focusing on its customers. Yolda.com’s marketplace solution encompasses many local forwarders and logistics companies, enabling SMEs and corporate enterprises to receive an instant quote for multiple shipment requests on a single platform. Companies can also track their shipments via Yolda.com's intelligent control panel and measure their logistics operations performance with detailed reporting services. | $1.9M / Seed / Jun 10, 2021 | ||
| Logistic operations still largely run on paper. It is almost impossible to track the vast majority of loads, receive delivery documents or measure how successful the operation is. Yolda.com is changing this with a strategic operating model that combines advanced tech and data analytics, logistics infrastructure, and hands-on supply chain expertise.Yolda.com combines the quality of cargo transportation with the diversity of haulier and the integrated service model of 3PL companies and offers a high-quality logistics experience by focusing on its customers. Yolda.com’s marketplace solution encompasses many local forwarders and logistics companies, enabling SMEs and corporate enterprises to receive an instant quote for multiple shipment requests on a single platform. Companies can also track their shipments via Yolda.com's intelligent control panel and measure their logistics operations performance with detailed reporting services. | $830K / Pre-Seed / May 22, 2020 | ||
| CheckYeti is the largest online platform to book activities in 1000+ mountain and beach destinations across Europe - including skiing & snowboarding, rafting & canyoning, mountain biking, paragliding & ballooning, diving & surfing, jet skiing, boat trips and many more. With 12 000+ offers in 16 countries, CheckYeti enablesholidaymakers and outdoor enthusiasts to experience summer and winter activities with their ideal guide. | $2M / Seed / Jul 01, 2017 | ||
| Swelly connects businesses and brands with Gen Z opinions using a social voting platform and a consumer insights platform.Swelly helps people to make better decisions while providing hours of entertainment in a unique voting experience on iOS & Android as well as our Swelly bot for Messenger, Line, Viber, kik and Telegram: www.swelly.ai(http://www.swelly.ai/) Swelly for Business helps brands understand how Gen Z thinks. | $300K / Seed / Feb 02, 2016 | ||
| Swelly connects businesses and brands with Gen Z opinions using a social voting platform and a consumer insights platform.Swelly helps people to make better decisions while providing hours of entertainment in a unique voting experience on iOS & Android as well as our Swelly bot for Messenger, Line, Viber, kik and Telegram: www.swelly.ai(http://www.swelly.ai/) Swelly for Business helps brands understand how Gen Z thinks. | $300K / Seed / Oct 16, 2015 |
Co-Investors
About Speedinvest
Speedinvest is a globally active European venture capital firm built on a simple belief: many move more. From six offices across EMEA, our sector-focused investment teams back relentless founders from pre–Seed to Growth with long-term conviction, providing day-one access to our global network of corporate customers, experts, industry leaders, andtop-tier follow-on investors to scale smarter and faster. Building lasting companies like Bitpanda (Austria), Moove (Nigeria), Gigs (U.S.), Tide (UK), ARX Robotics (Germany), Wayflyer (Ireland), GoStudent (Austria), Seqera Labs (Spain), and Cylib (Germany) — together. Big ideas may start with one. But scaling and winning take The Power of More.
Speedinvest Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Florian Obst
Associate
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Gabriel Tirouflet
Venture Partner
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Olga Shikhantsova
Principal
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Stefan Klestil
General Partner, Si F
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Tom Lesche
Partner
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FAQ
What does Stefan Kalteis invest in?
Stefan Kalteis invests primarily in Software, Travel and Tourism startups, most often at Seed and Pre-Seed stage. Most of the 8 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does Stefan Kalteis invest in?
Stefan Kalteis typically joins rounds of $300k–$6.6M at Seed. These are whole funding-round sizes, not Stefan Kalteis's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds Stefan Kalteis took part in.
How do I contact Stefan Kalteis?
Public channels for Stefan Kalteis include LinkedIn and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Stefan Kalteis last invest?
The most recent investment recorded for Stefan Kalteis closed in Nov 2025. Shizune tracks 8 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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