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ImHaus Service GmbH 

Rheinfelden · Since 2013

The core activity of ImHaus Service GmbH is the management of properties, particularly house administration and maintenance, with a focus on efficient and customer-friendly management of real estate in Rheinfelden.

ImmoIntegral GmbH 

Rheinfelden · Since 2006

The core activity of ImmoIntegral GmbH is property management and administration.

INNOVEVA GmbH 

Rheinfelden · Since 2021

INTER ACT Ziegler GmbH 

Rheinfelden · Since 2024

INTER ACT Ziegler GmbH advises cities, municipalities, companies and organisations on climate, biodiversity and sustainability, providing services such as participation and moderation, analyses and concept development, mediation and organisational development, as well as project management and personnel leadership.

Interna Beat Bieber 

Rheinfelden · Since 1990

International Federation of Social Workers 

Rheinfelden · Since 2018

The core activity of the company is the promotion and support of social work on a global level. The International Federation of Social Workers (IFSW) represents the interests of social workers worldwide and is committed to improving the living conditions of people in need. The main activities include: Organizing conferences and events on the topic of social work, Developing guidelines and standards for social work, Supporting social workers in different regions of the world, Promoting education and research in the field of social work, Representing the interests of social workers at international organizations such as the United Nations. The IFSW is a global network of social workers that advocates for improving the living conditions of people and promotes social work as a profession.

Inwestra AG 

Rheinfelden · Since 1967

The core activity of Inwestra AG is the management of real estate, in particular the rental of apartments in various properties in Rheinfelden and Basel.

ITandFactory AG 

Rheinfelden · Since 1998

The core activity of ITandFactory is the development and distribution of engineering software for plant construction, particularly for the chemical, pharmaceutical, food, beverage, oil and gas industries. The software supports customers in project planning, plant documentation, integration and intelligent solutions in plant construction. The company offers complete solutions for plant planning based on various technology platforms, such as AutoCAD, Microsoft Office and MicroStation.

Jack's Gastro & Event GmbH 

Rheinfelden · Since 2010

The company is a steakhouse with an attached wine production and sales facility. It offers a wide range of food and beverages, including steaks, wines and spirits. The company's core activity lies in gastronomy and wine trade.

Jäggi + Wendelspiess, Architektur + Informatik AG 

Rheinfelden · Since 1998

The core activity of Jäggi + Wendelspiess Architektur + Informatik AG is the provision of services in the field of architecture, particularly in the areas of: Architecture: planning and design of buildings and spaces; Estimating: cost estimation and planning for construction projects; Real Estate: consulting and management of property administration and development; and Client Support: supporting and advising clients in the planning and realization of construction projects. The company thus offers comprehensive services for the planning, implementation and management of construction projects.

Jenal & Partners Biosafety Consulting GmbH 

Rheinfelden · Since 2025

The core activity of Jenal & Partner is consulting and supporting biological risk assessment and management, particularly in the areas of biosafety and biosecurity. The company offers solutions and expertise in biological risk assessment, biosafety, biosecurity and communication to promote the positive impact of biotechnological advancements on society.

Jetzer Immobilien GmbH 

Rheinfelden · Since 2005

Jetzer Immobilien GmbH brokers residential and commercial properties and handles sales mandates and property marketing. Services also include property valuations (market-value analyses), client consultations and discreet, transparent brokerage processes.

Jetzer Immobilienvermittlung 

Rheinfelden · Since 2004

Jetzer Immobilienvermittlung offers real estate brokerage services, managing property sales, rentals and valuations for residential and commercial properties.

J. Willers Engineering AG 

Rheinfelden · Since 1989

J. Willers Engineering AG is an engineering firm for high‑tech buildings and infrastructure. It provides planning and engineering services including building services engineering, cleanroom and laboratory systems for life‑sciences, data center and energy solutions, BIM/BIM2FM and cyber security.

Karakas Recruiting 

Rheinfelden · Since 2022

The core activity of Karakas Recruiting is Executive Search and personnel placement, specializing in MedTech companies in Northwestern and Central Switzerland. The company offers targeted talent search, direct approach and Active Sourcing to provide companies with the best matching candidates.

KASTO Schweiz AG 

Rheinfelden · Since 2016

The core activity of KASTO is the development, manufacture and distribution of sawing machines and storage technology, including the associated software solutions and services. The company offers complete solutions for metal processing and storage to provide customers with competitive advantages and investment security.

KineSuisse Berufsverband für Kinesiologie 

Rheinfelden · Since 2007

The core activity of KineSuisse is to represent and promote the interests of professionally active kinesiologists in Switzerland, in particular by ensuring the quality of education and training, promoting the visibility and recognition of the complementary therapy method of kinesiology in the Swiss healthcare system, and representing the profession in professional policy matters.

Kistler Holz AG 

Rheinfelden · Since 1984

The core activity of Kistler-Holz AG is the trade in European roundwood, particularly oak roundwood, as well as the manufacture and distribution of oak wood products, such as tree and trunk protection, forest path signage, sleepers and squared timber.

Maler Fleig AG 

Rheinfelden · Since 1996

The core activity of Maler Fleig AG includes painting and plastering work, both indoors and outdoors, including facade renovation, scaffolding construction, damage repair, water damage service, crack renovation, mold remediation and floor laying work.

m & d drive GmbH 

Rheinfelden · Since 2012