Data that brings clarity.

Markets

 

Size of the organisation ✓

Audited key figures are marked with the symbol ✓. More information here.

 

Acquisitions and sales in 2025:

• Acquisition of BFW Lichtenberg Messdienst GmbH & Co. KG, Hamburg, Germany, and IB Verwaltungs GmbH, Hamburg, Germany
• Acquisition of Flink Nederland Groep B.V., Tilburg, Netherlands; Flink Nederland B.V., Tilburg, Netherlands; Flink Services B.V., Tilburg, Netherlands; Wattanders B.V., Bunnik, Netherlands
• Acquisition of ista Customer Service GmbH, Essen, Germany
• Establishment of ista Middle East Bahrain L.L.C, Manama, Kingdom of Bahrain 

 

Acquisitions and sales in 2024: 

• Acquisition of Chargemaker GmbH, Frankfurt, Germany
• Acquisition of Alfred Aubort S.A., Bussigny, Switzerland
• Sale of ista Sverige AB, Stockholm, Sweden

 

Acquisitions and sales in 2023: 

• Acquisition of Habidat Smart Buildings S.L., San Sebastian, Spain
• Acquisition of GEMAS GmbH Gesellschaft für Energiemess-​ u. Auswertesysteme, Markgröningen, Germany
• Acquisition of remaining shares in objego GmbH, Essen, Germany
• Acquisition of Techem Energy Services LLC, Dubai, United Arab Emirates
• Establishment of ista Technologies Poland Sp. z.o.o., Gliwice, Poland
• Establishment of Verbund Messen und Abrechnen GmbH, Essen, Germany
• Sale of facilioo GmbH, Berlin, Germany
• Liquidation of ista Rus o.o.o., Moscow, Russia
   

Percentage of radio-​based devices in Germany ✓

¹ Number of properties with fully remotely readable devices in Germany divided by the total number of properties with heating cost billing in Germany.

Customers’ footprint from heating cost billing in Germany¹

¹ The figures for 2025 are not yet available, as most of the heating cost bills are not available until the end of the following year.
² The CO₂ emission figures of ista properties were extrapolated to represent the total number of properties in Germany. Our target is a 20% reduction compared with the 2018 figure, which corresponds to a target of 25 kg CO₂-eq/m² in 2030.

Environment ✓

Consumption of electricity and heat within the organisation

Energy intensity

¹ This figure includes all energy consumption (electricity, heat and road fuel).

Use of electricity from renewable energy sources

Fuel consumption of vehicles within the organisation

Greenhouse gas footprint (scope 1-3)

¹ Full-time equivalent

Change in greenhouse gas emissions

(changes in absolute terms compared with the previous year)

Employees✓¹

Total number of employees by employment contract and type of employment²

¹ Due to system-related limitations, the headcount figures for the companies BFW Lichtenberg, GEMAS, Chargemaker and SGW are based on extrapolated FTE figures. 

² excluding apprentices

Age structure of the workforce¹

¹ Excluding apprentices, only full-time employees with a permanent contract.
² Excluding apprentices, including full-time and part-time employees (with a permanent or fixed-​term contract).

Workforce by gender and type of employment¹

¹ Excluding apprentices, only full-time employees with a permanent contract.
m = male, f = female

Sickness rate

¹ Due to different data collection practices in Belgium, the sickness rate reported here includes long-term sickness starting at four weeks, compared to six weeks in the rest of the Group.

²Due to missing data, the sick leave figures for FLINK had to be estimated.

Years of service, turnover by reason for termination and recruitment rate

¹ Total number of departures divided by total workforce (minus total number of new recruits plus total number of departures).

Work-​related accidents per 100,000 hours worked (frequency rate)

¹ Frequency rate = number of accidents at work x 100,000 / hours worked. Data from ista Express and ista Customer Service were not included in the calculation of the frequency rate.
² Accidents that led to an employee being absent for more than three shifts (commuting accidents not included).

Society

Key memberships and cooperation partners

We are involved in a large number of networks in working groups and technical committees in order to actively shape progress on current social, political and ecological issues: 

• Bundesverband der Energie- und Wasserwirtschaft (BDEW – Federal Association of the Energy and Water Industries) 
• Bundesfachverband der Immobilienverwalter e. V. (BVI - Federal Association of Property Managers) 
• Bundesverband Freier Immobilien- und Wohnungsunternehmen (BFW – Federal Association of Independent Real Estate and Housing Companies) 
• Bundesverband für Energie- und Wasserdatenmanagement (bved - Federal Association for Energy and Water Data Management) 
• Bundesverband Informationswirtschaft, Telekommunikation und neue Medien e. V. (Bitkom – German Association for IT, Telecommunications and New Media) 
• Deutsche Unternehmensinitiative Energieeffizienz e. V. (DENEFF – German Industry Initiative for Energy Efficiency) 
• Deutscher Verband für Wohnungswesen (DV – German Association for Housing, Urban and Spatial Development) 
• Die Wohnungswirtschaft Deutschland (GdW – Umbrella Organisation of the German Housing Industry) 
• WE Data Europe 
• Initiative Corporate Governance der deutschen Immobilienwirtschaft (ICG – Corporate Governance Initiative of the German Real Estate Industry) 
• UN Global Compact (UNGC) & Global Compact Netzwerk Deutschland (UN GCD)  
• UPJ e. V. (German Network of Engaged Companies and Non-profit Intermediary Organisations) 
• Verband der Immobilienverwalter Deutschland (VDIV – Association of German Property Managers) 
• Wirtschaftsrat der CDU e. V. (Economic Council of the CDU) 
• Zentraler Immobilien Ausschuss (ZIA – German Real Estate Trade Association) 

About this report

Progress Report 2025/26

The Progress Report 2025/26 is ista’s 16th sustainability report. At the same time, it represents the progress report for the Global Compact of the United Nations. 

 

Frame of reference 

The key environmental and employee figures in this report include not only ista SE, its parent company Trionista SE and its 47 direct and indirect subsidiaries (together the “ista Group”) but also ista Luxembourg S.à r.l  and its affiliate ista Express Service GmbH, which is also operationally active. The aforementioned companies are collectively referred to as the “extended ista Group”. 

 

Key figures and audit

The key figures regarding the workforce structure were recorded as of 31 December 2025. The specific key environmental figures, on the other hand, are based on the average full-time equivalent (FTE) for 2025. 

The key environmental performance figures and the key employee figures for the 2025 financial year were the subject of a limited assurance audit conducted by SGS-TÜV Saar GmbH (SGS). The consolidated financial statements of the ista Group are audited by PricewaterhouseCoopers International (PwC). Audited key figures are marked in the tables by the symbol ✓. The SGS assurance report can be viewed here. 

The proportion of data estimated is 17.8% for electricity consumption and 49.2% for heating energy.

The CO₂ emission factors are based on sources of the International Energy Agency (IEA), the Department for Environment, Food and Rural Affairs (DEFRA) in the UK and the database of the life cycle assessment software (GaBi) of Sphera Solutions GmbH. The emission factors were also applied to the previous years.

When balancing the CO₂ equivalents, we converted the other greenhouse gases emitted (e.g. methane) into CO₂ emissions according to their impact on the climate and then stated them, together with the CO₂ emissions, as CO₂ equivalents. 

 

Editorial note

We at ista value diversity and inclusion. Therefore, in this report we attach great importance to using gender-sensitive language, with which we aim to take account of gender equality and to address and represent all genders in a respectful manner.  

The editorial deadline for this report was 31 May 2026. ista’s progress report appears annually.