ista International GmbH

ista International GmbH, commonly known as ista, is a German company headquartered in Essen that specializes in the management of energy and water consumption in buildings. Founded in 1957 by Johannes Schultz and Karl Völker, the company has grown into an internationally leading provider of submetering, smart metering, and related data-driven services for the real estate industry. Its core purpose is to make buildings climate-friendly, safe, and comfortable by giving owners and residents transparent, actionable information about their energy and water use. ista's offerings are built on a digital foundation. The company develops and operates wireless metering devices, data management platforms, and process services that help reduce CO2 emissions from buildings. According to its corporate website, ista has over 50 million wireless devices in operation globally and serves more than 14 million homes and commercial properties, working with over 460,000 customers. The group employs more than 6,800 people across 21 countries. In 2025, the entire ista Group recorded sales of EUR 1,279 million. The company positions itself as a partner for the digitalization of the real estate sector, helping customers increase transparency and efficiency while lowering carbon footprints. Its mission is to add sustainable value to buildings for residents and owners through managed data and processes. ista also maintains a Coordinated Vulnerability Disclosure Program to address security issues in its products and systems, reflecting its reliance on connected technologies. ista operates as a private corporate group. Its executive management board includes Dr. Hagen Lessing (Chief Executive Officer), Anke Dassler (Chief Financial Officer), Michaela Hitzberger (Chief Technology Officer), and Oliver Schlodder (Chief Sales Officer). The company continues to invest in new technologies and sustainability-focused solutions, working with customers and partners to develop future-proof building services.

ista was founded in 1957 in Germany by Johannes Schultz and Karl Völker. The company began with a focus on energy supply and smart metering solutions, and over the decades expanded its operations globally. Its early business centered on submetering — the individual measurement of heating and water consumption in multi-tenant buildings — which allowed building owners and residents to allocate costs fairly and encouraged energy conservation. As energy efficiency became a growing concern in Europe and beyond, ista grew into an international group. The company developed wireless metering technologies and digital platforms to collect, manage, and analyze consumption data at scale. By the 2020s, ista reported over 50 million wireless devices in operation worldwide and served more than 14 million homes and commercial properties, with over 460,000 customers. It employed more than 6,800 people across 21 countries. In 2025, the entire ista Group recorded sales of EUR 1,279 million. The company continues to position itself at the intersection of real estate digitalization and climate protection, helping buildings reduce CO2 emissions through data-driven management. Its mission is to add sustainable value to buildings for residents and owners by managing data and processes that make buildings climate-friendly, safe, and comfortable. ista operates as a private corporate group. Its executive management board includes Dr. Hagen Lessing (CEO), Anke Dassler (CFO), Michaela Hitzberger (CTO), and Oliver Schlodder (CSO). The company invests in new technologies and sustainability-focused solutions, working with customers and partners to develop future-proof building services. It also maintains a Coordinated Vulnerability Disclosure Program to ensure the security of its connected products and systems.

• 2025

  ista Group recorded sales of EUR 1,279 million.

• 1957

  Founded in Germany by Johannes Schultz and Karl Völker.

Internationally leading provider of energy and water consumption management and digitalization solutions for the real estate industry.

• Submetering for heating and water

• Smart metering devices

• Energy data management platforms

• CO2 monitoring and reporting

• Wireless metering solutions

1. 1ista SE - Corporateista.com
2. 2Blogista.com
3. 3Vulnerability Managementista.com
4. 4Careersista.com
5. 5Wikidatawikidata.org
6. 6Wikipedia (zh)zh.wikipedia.org