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Rossi Management & Consulting Services AG 

Altendorf · Since 2021

Rossi Management & Consulting Services AG provides management consulting and board services and serves as the umbrella for the founder's advisory and management activities. The firm focuses on leadership, strategic issues and investment‑related advisory, drawing on experience from the banking sector.

S-A Isolierungen GmbH 

Altendorf · Since 2024

S-A Isolierungen GmbH provides technical insulation and fire-protection services for industrial, commercial and building-services applications. The company carries out ventilation and pipe insulation, VKF‑compliant fire-stopping and manufactures custom sheet-metal claddings in its own workshop, supporting projects from planning through completion.

Sandra Hartmann Fotografie 

Altendorf · Since 2023

The company provides photography services, particularly for creating memory photos, e.g. by booking shootings.

Sanjo Management AG 

Altendorf · Since 2014

Sanjo Management AG provides real estate services including development, property management, rental management and portfolio management. The company also offers sales, caretaker (building maintenance) services and digital solutions such as the Sanjo App.

Sanjo Immobilien AG 

Altendorf · Since 1998

Sanjo Immobilien AG provides services in property development, property management, rental management, sales, portfolio management and building caretaking. The company manages residential and commercial properties, handles project development and marketing, and performs administrative and technical facility management tasks.

Sanjo Liegenschaften AG 

Altendorf · Since 2013

Sanjo Liegenschaften AG carries out property development, construction-related projects and property management, and handles rental and sales listings for owners and tenants. Services include landlord administration, tenant support with digital tools and the development of residential projects with attention to ecological and energy-efficiency criteria.

schilter.tech GmbH 

Altendorf · Since 2022

The core activity of Schilter.tech GmbH is consulting, planning and implementing solutions for energy-efficient building envelopes, photovoltaic systems and climate-friendly building technology. The company supports building envelope manufacturers, architects and builders in implementing the Energy Strategy 2050.

Schunk Carbon Technology AG 

Altendorf · Since 1955

The company's core activity is the development, production and processing of carbon and silicon carbide materials, as well as the manufacture of components for various industries such as automotive, chemicals, pharmaceuticals, food, climate and power plant technology, aerospace and shipbuilding. This includes, in particular, the production of sealing and pump components, carbon brushes, brush systems, slip ring contacts, current collectors and other components for e-mobility and vehicles.

Schweizerischer Factoringverband (SFAV) 

Altendorf · Since 2004

The company's core activity is the provision of factoring services, in particular the assignment of monetary claims from goods deliveries and services, in order to provide companies with short-term revenue financing and protection against claim defaults.

Sena Estate Invest AG 

Altendorf · Since 2021

The core activity of Sena Estate Invest AG is real estate consulting and brokerage for yield-generating properties. Specifically, this includes the following services: purchase and sale of yield-generating properties, valuation and appraisal of yield-generating properties, strategy and real estate consulting, mandates and operational support for yield-generating properties. The company thus offers comprehensive services for investors and owners of yield-generating properties.