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Callstack acquires Margelo

Acquisition Provisional 86% confidence first seen

Callstack announced that it will acquire Vienna-based React Native engineering firm Margelo in a deal valued at more than €20 million. The coverage says neither the purchase price breakdown nor the consideration structure (cash vs. equity), purchase price details, or closing date were disclosed, while Margelo’s open-source projects will remain open source and founder/maintainer Marc Rousavy will stay on. The companies framed the acquisition as a way to expand Callstack’s React Native enterprise and open-source portfolio, focusing on performance, architecture, and native integration as AI changes software development.

Callstack Margelo Marc Rousavy React Native

The deal

Margelo more than 20 million euros Acquisition · announced 1 Sep 2026

Investors Callstack

Deal terms as reported in the coverage below.

Source coverage

Vienna’s Margelo Joins Poland’s Callstack in a Deal Valuing It Above 20 Million Euros Trending Topics independent

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