Forvis Mazars supported ISTA SE in the acquisition of Blockstrom AG
4 March 2026
March 2026 | ISTA SE, a leading international provider of energy services based in Germany, has acquired Blockstrom AG. The Financial Advisory and Tax teams at Forvis Mazars supported ISTA SE by conducting financial, tax and social due diligence.
ISTA SE, an international energy services company with operations in more than 20 countries and over 6,000 employees, has acquired 100% of the shares of Blockstrom AG.
Founded in 2017 and headquartered in Bern, Switzerland, Blockstrom AG provides end-to-end metering and billing solutions for electricity, water, heating, and e-mobility in residential and commercial buildings, particularly those structured as energy communities (ZEV – “Zusammenschlüsse zum Eigenverbrauch”).
This strategic acquisition enables ISTA SE to strengthen its position in the Swiss market and expand its portfolio of digital and decentralized energy management solutions, further supporting the energy transition and the increasing demand for smart, community-based energy systems.
ISTA SE engaged the Financial Advisory and Tax teams at Forvis Mazars:
- for financial Due Diligence: Antonio Rubino, Pierre Aubrun, Arber Neziri and Neziha Halilovikj;
- for tax Due Diligence: André Kuhn, Caryl Neuenschwander and Ajith Vigneswaran;
- for social Due Diligence: Murielle Kammermann and Enes Jashari.
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