Observed Signal · Jun 15, 2026 · M&A - Announced · Source: Trending Topics · Impact: 2/5 · Sentiment: Neutral
Callstack Acquires Margelo, Valued at Over €20M
Polish software specialist Callstack has acquired Vienna-based engineering firm Margelo, which specializes in high-performance React Native development. The deal values Margelo at over €20 million. Both companies work on the cross-platform framework React Native, with Margelo known for its popular open-source libraries such as VisionCamera, react-native-mmkv, and Nitro Modules, which have tens of millions of downloads. Callstack, founded in 2016, employs over 200 people and serves enterprise clients. In summer 2025, Callstack received a growth investment from Viking Global Investors, valuing the company at around €120 million. Margelo founder Marc Rousavy will remain with the company, continuing to lead library development and collaborating on joint offerings. The companies cite the increasing role of AI in software development as a key driver for the merger.
Acquisition of a React Native engineering firm; relevant to mobile app development infrastructure but not directly to advertising technology.
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Key Takeaways & Evidence Grounding
- Callstack acquires Margelo, a React Native engineering firm based in Vienna.
- The transaction values Margelo at more than €20 million.
- Callstack received a growth investment from Viking Global Investors in summer 2025, valuing Callstack at approximately €120 million.
- Margelo's open-source libraries have over 420 million npm downloads combined.
- Founder Marc Rousavy will stay and continue to lead the development of Margelo's libraries.
Connected Companies & Entities
8 Entities mapped“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
“Damals stieg der US-Fonds Viking Global Investors mit einem Wachstumsinvestment ein...”
“wenige Monate nach der Veröffentlichung von React Native durch Meta...”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
“Als Referenzen nennt Margelo unter anderem Discord, Coinbase, Expensify, MetaMask, Rainbow, VSCO und WalletConnect....”
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