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Terra Therm AG 

Arni Ag · Since 2023

The core activity of Terra Therm AG is the planning, installation, manufacture and delivery of heat pumps and geothermal probes, particularly in the field of geothermal energy, to provide renewable energy for heating and cooling buildings.

TomTom-Tools AG 

Arni Ag · Since 2007

The core activity of TomTom-Tools GmbH is the development and manufacture of measurement and monitoring tools for the cement industry, particularly for use in heavy industrial applications. The products include, among others, ovality sensors, thrust load meters, floating shaft monitors and other specialized measuring devices for monitoring and optimizing cement kilns and other industrial processes.

Toytans AG 

Arni Ag · Since 2022

Toytans AG is an online retailer of playing cards, board games, toys and merchandise items, particularly for brands such as Star Wars, Lord of the Rings, Lego, Yu-Gi-Oh!, Magic, Disney and Pokémon. The company's core activity is the sale and shipping of these items to customers in Switzerland.

Wika Treuhand GmbH 

Arni Ag · Since 2001

The core activity of Wika Treuhand GmbH is the provision of services in the field of finance and accounting, in particular: accounting, tax consulting, personnel and payroll administration, consulting for small and medium-sized enterprises (SMEs) on liquidity, budgeting, business planning and financial reporting according to international standards (IFRS) or Swiss accounting standards (Swiss Gaap FER), and support for company foundations.

weaAssistants GmbH 

Arni Ag · Since 2025

weaAssistants GmbH provides cognitive training based on the method of Dr. med. Franziska Stengel, targeting functions such as concentration, perception, information processing, thinking, language and memory. Sessions are delivered by Angelika Weber, an occupational therapist (BSc).

4infinity GmbH 

Arni Ag · Since 2016

The company's core activity is consulting and project management for technical installations and conversions, particularly in the planning, design and coordination of infrastructure projects, conversions and expansions, as well as in the evaluation, analysis and maintenance of technical systems.

AZ Immobilien und Verwaltungen GmbH 

Arni Ag · Since 2017

The core activity of AZ Immobilien und Verwaltung GmbH is the brokerage and management of real estate, including purchase, rental, administration, valuation, financing and energy consulting.

CLAUDIA RÖTHLIN HUMAN RESOURCES 

Arni Ag · Since 2015

CLAUDIA RÖTHLIN HUMAN RESOURCES is a human resources consultancy that supports organisations with competence management, performance management, interim HR management and leadership coaching. Services include aligning employee competencies with corporate strategy, developing HR monitoring tools and providing short-term HR leadership and project support.

comsystems ag 

Arni Ag · Since 2001

C + S AG 

Arni Ag · Since 2006