Observed Signal · Jun 23, 2026 · M&A - Announced · Source: Trending Topics · Impact: 2/5 · Sentiment: Positive
Callstack Acquires Margelo for Over €20 Million
Polish software specialist Callstack has acquired Vienna-based engineering firm Margelo, with the deal valuing Margelo at over €20 million. Both companies specialize in the cross-platform framework React Native, used to build apps for iOS and Android. Margelo is known for its open-source libraries, including VisionCamera (40 million downloads) and react-native-mmkv (67 million downloads). Callstack, founded in 2016, employs over 200 people and serves over 100 enterprise clients. The acquisition follows a growth investment from Viking Global Investors in summer 2025 that valued Callstack at approximately €120 million. Margelo founder Marc Rousavy will remain on board, continuing to develop Margelo's libraries. The combined entity aims to leverage AI-driven changes in software development to focus on architecture, performance, and security.
Consolidation in the React Native ecosystem, but limited direct impact on AdTech core sectors like advertising, identity, or programmatic buying. Relevant to mobile app development infrastructure used by some AdTech firms.
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Key Takeaways & Evidence Grounding
- Callstack has acquired Margelo for a valuation of more than €20 million.
- Margelo is known for open-source React Native libraries with over 420 million npm downloads.
- Callstack received a growth investment from Viking Global Investors in summer 2025.
- Margelo founder Marc Rousavy will stay with the company post-acquisition.
- The deal is intended to strengthen Callstack's technology and open-source portfolio.
Connected Companies & Entities
2 Entities mapped“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
“Der polnische Software-Spezialist Callstack übernimmt das Wiener Engineering-Unternehmen Margelo....”
Ontology Mapping & Concepts
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