Frank Thieser

working on European tech sovereignty

📍 Germany🔄 Updated September 2026💼 6 investments📅 3 years investing🗓 Last invested Mar 2026
Angel investor🌍 GermanyInvested this year
6
Total investments
3
Early stage
1
Mid stage
0
Late stage
3y
Years active

Portfolio

6 investments · sorted by recency
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Late stage
Investor
Mar 2026
Online Oceans designs, builds and operates cutting-edge Ocean Robots.
Investor
Dec 2025
A network for entrepreneurs building in stealth. Submit your information here so investors can find you: harmonic.ai/get-discovered
Investor
Dec 2025
Next-Generation Air Defense | Stealth Mode
Investor
May 2025
ZeroPhase develops sovereign, software-defined connectivity systems that are resilient and available at scale. Our long-range, high-throughput data links are purpose-built for unmanned platforms and critical operations, ensuring reliable communication even in the most demanding environments. We are a highly experienced, motivated, and ambitious team of engineers and innovators working with intensity and focus. What drives us is simple: to set a new standard in connectivity by combining performance, trust, and scalability - and to lay the foundation for the next generation of interconnected communication systems. Our mission is clear - to make sovereign, software-defined communication systems that are not only state-of-the-art, but also accessible and dependable at scale.
Investor
Jul 2024
Weles Acoustics specializes in the design and manufacturing of state-of-the-art particle velocity sensors dedicated to precise virbo-acoustic measurements. Based on our cutting edge sensor and technology, we’ve created unique sound probes that unravel any sound field without frequency limitations. Each Weles sound probe is able to measure: - Particle velocity – 1D or 3D - Sound pressure - Sound intensity – 1D or 3D - Sound power - Acoustic impedance Among the key applications of our sound probes and particle velocity sensing technology are all challenges related to sound source localization - regardless of the size of the source or its operating environment. Particle velocity measurement is a particularly powerful tool for locating sources of low frequency noise – even as low as 20 Hz. Other common applications include: - Particle velocity mapping - Sound intensity mapping - Sound power measurement - Sound pressure measurement - Quick troubleshooting – listen to particle velocity - Transmission and insertion loss measurements Thanks to this extraordinary versatility the probes find their uses in laboratories, R&D departments and manufacturing plants all around the world, where they help solve NVH challenges on products spanning from entire vehicles through engines, industrial machinery, airplanes, home appliances and consumer electronics. Versatility is at the heart of all our engineering projects. Thanks to such approach at Weles Acoustics we are able to rapidly build and deliver custom probes and sensors for specialized applications. Naturally provision of engineering services is also within the scope of our activities.
Investor
2023
Enhance. Multiply. Protect. ARX Robotics develops new defense capabilities for European armed forces. At the core is the proprietary ARX Mithra OS, which transforms both new and legacy platforms into networked, AI-enabled, and tactically deployable systems – modular, open-architecture, and mission-ready. With a strong focus on scaling across Europe, building production sites, and forming strategic industrial partnerships, ARX is driving the fast, cost-efficient manufacturing of intelligent systems in the European interest – actively contributing to the security-relevant reindustrialization of Europe. ARX combines technological excellence in AI, software architecture, and system integration with industrial expertise from the European automotive sector. Its systems are already in use by multiple European armed forces and are actively deployed in Ukraine. Explore how ARX is shaping the future of defense: 👉 www.arx-robotics.com/careers | careers@arx-robotics.com
Experience · 6 entries
All (6)
Investments (6)
2026
Investor
Mar 2026
Online Oceans designs, builds and operates cutting-edge Ocean Robots.
2025
Investor
Dec 2025
A network for entrepreneurs building in stealth. Submit your information here so investors can find you: harmonic.ai/get-discovered
Investor
Dec 2025
Next-Generation Air Defense | Stealth Mode
Investor
May 2025
ZeroPhase develops sovereign, software-defined connectivity systems that are resilient and available at scale. Our long-range, high-throughput data links are purpose-built for unmanned platforms and critical operations, ensuring reliable communication even in the most demanding environments. We are a highly experienced, motivated, and ambitious team of engineers and innovators working with intensity and focus. What drives us is simple: to set a new standard in connectivity by combining performance, trust, and scalability - and to lay the foundation for the next generation of interconnected communication systems. Our mission is clear - to make sovereign, software-defined communication systems that are not only state-of-the-art, but also accessible and dependable at scale.
2024
Investor
Jul 2024
Weles Acoustics specializes in the design and manufacturing of state-of-the-art particle velocity sensors dedicated to precise virbo-acoustic measurements. Based on our cutting edge sensor and technology, we’ve created unique sound probes that unravel any sound field without frequency limitations. Each Weles sound probe is able to measure: - Particle velocity – 1D or 3D - Sound pressure - Sound intensity – 1D or 3D - Sound power - Acoustic impedance Among the key applications of our sound probes and particle velocity sensing technology are all challenges related to sound source localization - regardless of the size of the source or its operating environment. Particle velocity measurement is a particularly powerful tool for locating sources of low frequency noise – even as low as 20 Hz. Other common applications include: - Particle velocity mapping - Sound intensity mapping - Sound power measurement - Sound pressure measurement - Quick troubleshooting – listen to particle velocity - Transmission and insertion loss measurements Thanks to this extraordinary versatility the probes find their uses in laboratories, R&D departments and manufacturing plants all around the world, where they help solve NVH challenges on products spanning from entire vehicles through engines, industrial machinery, airplanes, home appliances and consumer electronics. Versatility is at the heart of all our engineering projects. Thanks to such approach at Weles Acoustics we are able to rapidly build and deliver custom probes and sensors for specialized applications. Naturally provision of engineering services is also within the scope of our activities.
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Investment activity
2023–2026 · 6 investments
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