Silke Greiner

CEO A&S Beteiligungsgesellschaft mbH Business Angel of the Year 2025 by EU Business News 🏆🎉

📍 Austria🔄 Updated September 2026💼 9 investments📅 9 years investing🗓 Last invested Apr 2026
Angel investor🌍 AustriaInvested this year
9
Total investments
3
Early stage
2
Mid stage
1
Late stage
9y
Years active

Portfolio

8 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Apr 2026
FIVSEN builds Experience Infrastructure, adaptive multisensory environments that respond to people, context, and well-being. Our patented platform transforms physical spaces into responsive systems through orchestrated light, sound, scent, atmosphere, and interaction, moving beyond static design toward environments that actively support human performance and emotional state. Designed for hospitality, premium real estate, wellness, healthcare, and enterprise environments, FIVSEN enables operators to turn well-being into measurable value. At the core is the FIVSEN PORTAL, a modular deployment node. Instead of one-time installations, partners gain a continuously evolving environment that can be tuned, updated, and monetized over time. FIVSEN enables organizations to: • Differentiate spaces through adaptive, human-centric experiences • Increase perceived value per square meter • Unlock new revenue streams and loyalty mechanisms • Support recovery, focus, and performance in high-pressure environments • Deploy personalization at scale across locations Crafted and produced in Austria, FIVSEN combines engineering precision, sensory design, and patented technology to create a new category of responsive physical infrastructure. FIVSEN is built on a simple premise: Spaces should not just exist — they should respond. 🌐 www.fivsen.com 📧 enquiries@fivsen.com
Investor
Mar 2024
*** WE ARE HIRING *** Football Video Analysis for Everyone. Help shape the future of data driven sports in football ⚽ An AI based video tool for everyone interested in getting their club to the next level 🚀 Football video analysis and evaluation has never been easier. You get a perfect video of every match. There, decisive scenes can be marked quickly and efficiently and saved in playlists. In addition, we develop intelligent algorithms that recognise play, running routes and all events on the pitch and present them to you clearly.
Investor
Sep 2023
mytalents.ai - AI Tools: Discover, Learn, Apply. Transforming everyday work.
Investor
Mar 2023
Organizations face planning challenges on a daily basis. Shortages in supply due to unexpected sales and inaccurate inventory planning cause opportunity cost. Circly automates sales and inventory planning using latest developments in AI technology. Learn more "View more". What we offer? Were developing an interactive no-code toolbox for deploying automated B2B AI solutions for retailers. Experience AI technology as easy as ABC, as our concept enables even non-experts to bring their business into the 21st century using data! Our software can work as a standalone solution or is quickly and easily implemented into your existing enterprise software. We empower companies by:: - Improve forecast accuracy and increase efficiency - Accurate forecasts even for difficult data patterns (sporadic demand) - Reduction of planning costs, planning duration and manual effort - Forecasts per sales channel, hierarchy level and individual product variant - Avoidance of isolated planning and consolidation of plans - Optimization of allocation and replenishment - Ensuring optimal inventory levels - Monitoring of operational processes Your benefits: - Accurate and automated forecasting through innovative data models. - Agile, simple and collaborative planning. - User-friendly & intuitive advanced analytics solution for business users. - Fast and easy implementation or ready-to-use dashboard - Circlys attractive pricing models More info at https://www.circly.at/
Investor
Mar 2023
With our AI-based guitar learning app Fretello, we empower people to express themselves through music. This experience can look different for every user as our learning content is customizable and adapted to the experience level. Our app not only allows our users to learn, master, and play the guitar, Fretello provides real-time feedback and enables our users to follow a learn path, choose customizable practice sessions, or learn how to play their favorite songs to perform them in front of their friends and family or even on a big stage. Founded in 2016 by Florian Lettner and Wolfgang Damm, we have ever since grown into a warm-hearted and passionate bunch of 25+ people. Not only do we strive for simplicity and iterative improvements when it comes to our app but also in the way we are working together. Our team collaborates remotely from all corners of the world or on-site in our office facilities in Linz to offer the best possible music learning experience to our users. In addition to being passionate about our product, we Fretellians value transparency, flexibility, curiosity, ownership, and foster an appreciative team environment where we support and push each other. While we are remote-first here at Fretello, we would like to show our support for all Ukrainians and are able to offer assistance and support to all current and prospective employees in obtaining a Red-White-Red card (residence permit) should they wish to relocate to Austria.
Investor
Aug 2022
Die Plattform für schnelle Computerhilfe speziell für Selbstständige und Kleinstbetriebe. Einfach, kompetent, sicher!
Investor
Mar 2021
Your portal for expert advice to connect your users with your vetted experts 1️⃣ Fast orientation with SophiaAI 2️⃣ Matching with verified experts 3️⃣ Book and get advice online ❗Get your own expert portal for your community without any effort or regulatory headache 📍 partner.hallosophia.com
Investor
Oct 2017
presono - die Präsentationslösung, die tiefer geht. Die smarte Präsentationssoftware presono arbeitet nicht nur an der Oberfläche, sondern bietet eine tiefergehende Organisationslösung, die alle Aspekte des Präsentierens vereint. Sie haben genug vom täglichen Daten-Chaos, von verwirrenden Ordner-Strukturen, von veralteten Inhalten und Designs? presono macht damit Schluss und ermöglicht ein zentrales, flexibles und professionelles Arbeiten und Präsentieren. Egal wie Sie presono für Ihre Zwecke einsetzen, die Software passt sich flexibel Ihren Bedürfnissen an und liefert verschiedenste Anwendungsmöglichkeiten aus einem zentralen System: > Klassische Präsentationen Serielle Präsentationen mit presono einfacher erstellen, besser verwalten und schöner aussehen lassen. > Multimediale, interaktive Präsentationen Inhalte und Botschaften flexibler präsentieren, Slides schneller bearbeiten & interaktiver gestalten. > Präsentationen für den Messeeinsatz Interaktive Präsentationen unkomplizierter erstellen & mit minimalem Aufwand adaptieren. > Vertriebs-App für Unternehmen Direkt auf alle Daten und Dokumente der Unternehmensstruktur zugreifen – online und offline! Die zentralen Features: > überall verfügbar > einfach & intuitiv > stets aktuelle Dateninhalte > einheitliches Design > multimedial & interaktiv > Freigaben & Auswertungen
Experience · 9 entries
All (9)
Investments (9)
2026
Investor
Apr 2026
FIVSEN builds Experience Infrastructure, adaptive multisensory environments that respond to people, context, and well-being. Our patented platform transforms physical spaces into responsive systems through orchestrated light, sound, scent, atmosphere, and interaction, moving beyond static design toward environments that actively support human performance and emotional state. Designed for hospitality, premium real estate, wellness, healthcare, and enterprise environments, FIVSEN enables operators to turn well-being into measurable value. At the core is the FIVSEN PORTAL, a modular deployment node. Instead of one-time installations, partners gain a continuously evolving environment that can be tuned, updated, and monetized over time. FIVSEN enables organizations to: • Differentiate spaces through adaptive, human-centric experiences • Increase perceived value per square meter • Unlock new revenue streams and loyalty mechanisms • Support recovery, focus, and performance in high-pressure environments • Deploy personalization at scale across locations Crafted and produced in Austria, FIVSEN combines engineering precision, sensory design, and patented technology to create a new category of responsive physical infrastructure. FIVSEN is built on a simple premise: Spaces should not just exist — they should respond. 🌐 www.fivsen.com 📧 enquiries@fivsen.com
2024
Investor
Mar 2024
*** WE ARE HIRING *** Football Video Analysis for Everyone. Help shape the future of data driven sports in football ⚽ An AI based video tool for everyone interested in getting their club to the next level 🚀 Football video analysis and evaluation has never been easier. You get a perfect video of every match. There, decisive scenes can be marked quickly and efficiently and saved in playlists. In addition, we develop intelligent algorithms that recognise play, running routes and all events on the pitch and present them to you clearly.
2023
Investor
Sep 2023
mytalents.ai - AI Tools: Discover, Learn, Apply. Transforming everyday work.
Investor
Mar 2023
Organizations face planning challenges on a daily basis. Shortages in supply due to unexpected sales and inaccurate inventory planning cause opportunity cost. Circly automates sales and inventory planning using latest developments in AI technology. Learn more "View more". What we offer? Were developing an interactive no-code toolbox for deploying automated B2B AI solutions for retailers. Experience AI technology as easy as ABC, as our concept enables even non-experts to bring their business into the 21st century using data! Our software can work as a standalone solution or is quickly and easily implemented into your existing enterprise software. We empower companies by:: - Improve forecast accuracy and increase efficiency - Accurate forecasts even for difficult data patterns (sporadic demand) - Reduction of planning costs, planning duration and manual effort - Forecasts per sales channel, hierarchy level and individual product variant - Avoidance of isolated planning and consolidation of plans - Optimization of allocation and replenishment - Ensuring optimal inventory levels - Monitoring of operational processes Your benefits: - Accurate and automated forecasting through innovative data models. - Agile, simple and collaborative planning. - User-friendly & intuitive advanced analytics solution for business users. - Fast and easy implementation or ready-to-use dashboard - Circlys attractive pricing models More info at https://www.circly.at/
Investor
Mar 2023
With our AI-based guitar learning app Fretello, we empower people to express themselves through music. This experience can look different for every user as our learning content is customizable and adapted to the experience level. Our app not only allows our users to learn, master, and play the guitar, Fretello provides real-time feedback and enables our users to follow a learn path, choose customizable practice sessions, or learn how to play their favorite songs to perform them in front of their friends and family or even on a big stage. Founded in 2016 by Florian Lettner and Wolfgang Damm, we have ever since grown into a warm-hearted and passionate bunch of 25+ people. Not only do we strive for simplicity and iterative improvements when it comes to our app but also in the way we are working together. Our team collaborates remotely from all corners of the world or on-site in our office facilities in Linz to offer the best possible music learning experience to our users. In addition to being passionate about our product, we Fretellians value transparency, flexibility, curiosity, ownership, and foster an appreciative team environment where we support and push each other. While we are remote-first here at Fretello, we would like to show our support for all Ukrainians and are able to offer assistance and support to all current and prospective employees in obtaining a Red-White-Red card (residence permit) should they wish to relocate to Austria.
Show all 9 entries ↓
Investment activity
2017–2026 · 9 investments
201712021120222202332024120261
Recent (last 2 years)Earlier