Observed Signal · Aug 25, 2026 · M&A - Announced · Source: Trending Topics · Impact: 2/5 · Sentiment: Positive
M&A Market: BOOKR Kids Raises €6.1M Series A; Callstack Acquires Margelo
Budapest-based educational technology company BOOKR Kids has secured €6.1 million in a Series A funding round led by TCEE Fund IV, advised by 3TS Capital Partners. The capital will support international expansion of its digital language-learning library and AI-enabled teacher tools. Concurrently, Polish software developer Callstack has acquired Vienna-based mobile engineering firm Margelo, a specialist in React Native open-source libraries, in a deal valuing Margelo at over €20 million. Founder Marc Rousavy will remain with Callstack to drive mobile technology developments.
An edtech growth round and a substantial app-development software agency acquisition reflect healthy funding environments for European tech infrastructure and engineering services.
Wichtigste Kernpunkte & Evidenz
- BOOKR Kids secured €6.1 million in a Series A round led by TCEE Fund IV.
- BOOKR Kids reports revenues of approximately $2.7 million for 2025 and is EBITDA-positive.
- Polish software development company Callstack acquired Vienna-based mobile engineering firm Margelo.
- The acquisition deal values Margelo at over €20 million, with founder Marc Rousavy remaining as a key shareholder.
Verknüpfte Unternehmen
9 verknüpfte UnternehmenMeta
Konsumentenorientierte Internet-Plattformen, die durch digitale Werbung, Apps, Abonnements und Virtual Reality monetarisiert werden.
“Callstack was founded in 2016 in Wrocław, a few months after Meta released React Native....”
VSCO
VSCO verbindet Fotografie-Apps mit professionellen Business-Tools, Creator-Vermittlung und maßgeschneiderten Werbeformaten für Marken.
“Margelo lists Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO and WalletConnect among its references......”
Viking Global
Global investment firm managing public, private, credit and structured-capital strategies.
“Its finances got a boost last summer, when US fund Viking Global Investors came in with a growth investment that valued Callstack at roughly...”
Coinbase
Handelsplattform, Verwahrungslösung und Krypto-Infrastruktur für digitale Assets.
“Margelo lists Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO and WalletConnect among its references......”
Expensify
Expensify bietet eine integrierte Plattform für Ausgaben-, Firmenkarten- und Reisekartenmanagement in Unternehmen.
“Margelo lists Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO and WalletConnect among its references......”
Margelo
React Native mobile engineering and product design agency.
“Polish software company Callstack is acquiring Vienna-based engineering firm Margelo....”
Discord
Eine Community-Chat-Plattform, die sich durch Abonnements, digitale Güter und native Werbeformate finanziert.
“Margelo lists Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO and WalletConnect among its references......”
3TS Capital Partners
Zentraleuropäischer Technologieinvestor und Fondsberater für Venture- und Growth-Kapital.
“The round is led by TCEE Fund IV, which is advised by 3TS Capital Partners....”
Callstack
Enterprise React Native engineering and AI delivery services.
“Polish software company Callstack is acquiring Vienna-based engineering firm Margelo....”
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