# The 32 largest companies in Sion

Tamtam tracks 32 companies headquartered in Sion. This list ranks all of them by number of employees on LinkedIn, led by Etat du Valais - Staat Wallis, Hôpital du Valais and HES-SO Valais-Wallis. Their median headcount is 17. Half of them were founded in 2011 or later.

This list of companies in Sion predominantly features public sector entities and service providers, alongside some specialized industrial firms. Notable organizations include Etat du Valais - Staat Wallis, a major government administration employer; Hôpital du Valais, a regional healthcare provider; HES-SO Valais-Wallis, a higher education institution; and BCVs | WKB, a banking service provider. Other significant companies are HYDRO Exploitation SA, specializing in renewable energy services, and Le Nouvelliste, a long-established newspaper publisher.

The data shows a strong presence of public administration, healthcare, and education within Sion's economic landscape, indicating a focus on public services and knowledge-based industries. There is also a notable representation of banking and specialized manufacturing, such as H55 in aviation and aerospace, suggesting a diverse yet service-oriented local economy.

🇨🇭 Sion · 32 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Etat du Valais - Staat Wallis](https://www.tamtam.ai/c/etat-du-valais-staat-wallis) (vs.ch)<br>One of the largest employers in Valais offering a variety of job opportunities in different services and professions to enhance the quality of life in the region | Government Administration | 🇨🇭 Sion | 2,616 |  |
| 2 | [Hôpital du Valais](https://www.tamtam.ai/c/hopital-du-valais) (spitalwallis.ch)<br>Regional healthcare provider operating multiple hospital centers and specialized institutes, delivering extensive inpatient, outpatient, and emergency medical services. | Hospitals and Health Care | 🇨🇭 Sion | 1,655 | 2004 |
| 3 | [HES-SO Valais-Wallis](https://www.tamtam.ai/c/hes-so-valais-wallis) (hevs.ch)<br>Higher education institution offering practical degree programs across art, management, engineering, health sciences, and social work with research institutes. | Higher Education | 🇨🇭 Sion | 1,108 |  |
| 4 | [University of Applied Sciences and Arts Western Switzerland Valais (HES-SO Valais-Wallis)](https://www.tamtam.ai/c/university-of-applied-sciences-and-arts-western-switzerland-valais-hes-so) (hevs.ch)<br>This company operates five schools in Valais offering 10 degree programs, nine research institutes, with 700 staff members and over 2,500 students | Higher Education | 🇨🇭 Sion | 433 |  |
| 5 | [BCVs \| WKB](https://www.tamtam.ai/c/bcvs-wkb) (bcvs.ch)<br>Provides retail banking, wealth management for individuals and institutions, and business banking services across the Canton of Valais with extensive digital offerings. | Banking | 🇨🇭 Sion | 433 | 1917 |
| 6 | [HYDRO Exploitation SA](https://www.tamtam.ai/c/hydro-exploitation-sa) (hydro.ch)<br>Specializing in operating and maintaining hydroelectric power stations, we provide services to owners of electrical generation facilities, producing a significant percentage of Swiss hydroelectric power | Services for Renewable Energy | 🇨🇭 Sion | 295 | 2002 |
| 7 | [OIKEN](https://www.tamtam.ai/c/oiken) (oiken.ch)<br>Specializes in activating future potential by providing innovative solutions and strategies to empower individuals and organizations for success. | Environmental Services | 🇨🇭 Sion | 285 | 2019 |
| 8 | [Le Nouvelliste](https://www.tamtam.ai/c/le-nouvelliste) (linktr.ee)<br>Established in 1903, a leading francophone regional daily newspaper in Sion, known for its high local readership and quality editorial content | Newspaper Publishing | 🇨🇭 Sion | 162 | 1903 |
| 9 | [H55](https://www.tamtam.ai/c/h55) (h55.ch)<br>Design and manufacture certified electric propulsion systems for aviation, focusing on clean, quiet, safe, and affordable technology. | Aviation and Aerospace Component Manufacturing | 🇨🇭 Sion | 144 | 2017 |
| 10 | [La Colline](https://www.tamtam.ai/c/la-colline) (ch.lacolline-skincare.com)<br>Development of advanced skin treatments supporting research to improve skin graft quality, combining safety, efficacy, and sensorial experience. | Personal Care Product Manufacturing | 🇨🇭 Sion | 92 | 1997 |
| 11 | [Raiffeisen Sion et Région](https://www.tamtam.ai/c/raiffeisen-sion-et-region) (raiffeisen.ch)<br>A financial institution resulting from several mergers, now the largest Raiffeisen bank in Switzerland, with a focus on growth and market presence | Banking | 🇨🇭 Sion | 90 |  |
| 12 | [Banque Cantonale du Valais](https://www.tamtam.ai/c/banque-cantonale-du-valais) (bcvs.ch)<br>A Swiss regional bank offering Retail, Private, and Business banking services with a focus on customer segments and regions within the Canton of Valais | Banking | 🇨🇭 Sion | 61 | 1925 |
| 13 | [Audacia Group](https://www.tamtam.ai/c/audacia-group) (audacia.co)<br>Audacia Group empowers e-commerce and online companies to grow through innovative digital experiences and operational excellence, supporting brand development and customer satisfaction | Technology, Information and Internet | 🇨🇭 Sion | 39 | 2018 |
| 14 | [Service de la culture - Etat du Valais / Dienststelle für Kultur - Staat Wallis](https://www.tamtam.ai/c/service-de-la-culture-etat-du-valais-dienststelle-fur-kultur-staat-wallis) (vs.ch)<br>The cultural service implements the canton's cultural policy by promoting a diverse and vibrant culture for individual and collective development It focuses on creation, animation, dissemination, cultural education, and protection of cultural heritage | Government Administration | 🇨🇭 Sion | 27 |  |
| 15 | [Sion Airport](https://www.tamtam.ai/c/sion-airport) (sionaeroport.ch)<br>The company operates an international airport in the heart of the Alps, offering business, charter, and private flights, along with luxury hangarage and aircraft maintenance services | Aviation and Aerospace Component Manufacturing | 🇨🇭 Sion | 22 | 1935 |
| 16 | [Immoval SA](https://www.tamtam.ai/c/immoval-sa) (immoval.ch)<br>Active in property development, brokerage, architecture, and general contracting across Fribourg, Vaud, and Valais regions, offering project design and sales. | Real Estate | 🇨🇭 Sion | 17 |  |
| 17 | [Urbio](https://www.tamtam.ai/c/urbio) (urb.io)<br>A company developing generative design software for energy transition actors, focusing on improving building efficiency to combat climate change | Software Development | 🇨🇭 Sion | 15 | 2020 |
| 18 | [Berthod Transports SA](https://www.tamtam.ai/c/berthod-transports-sa) (berthodtransports.ch)<br>A reliable and versatile transportation company offering regional, national, and international services, including exceptional transport, express delivery, ADR/SDR, and storage solutions | Truck Transportation | 🇨🇭 Sion | 14 | 1946 |
| 19 | [Magic Mountains Cooperation](https://www.tamtam.ai/c/magic-mountains-cooperation) (magicpass.ch)<br>Free unlimited access to cable cars across numerous ski resorts and summer destinations offering skiing, biking, hiking, and family excursions. | Spectator Sports | 🇨🇭 Sion | 11 | 2017 |
| 20 | [WattAnyWhere](https://www.tamtam.ai/c/wattanywhere) (wattanywhere.com)<br>The company provides solid oxide fuel cell based mobile generators that use ethanol to rapidly deploy ultra-fast chargers for electric vehicles in Europe | Renewable Energy Power Generation | 🇨🇭 Sion | 10 | 2021 |
| 21 | [DiverSsiTy SA](https://www.tamtam.ai/c/diverssity-sa) (diverssity.io)<br>Multisensory, data-driven digital solutions for Autism Spectrum Disorder individuals, enhancing abilities, quality of life, and care through personalized home-based practice | Mental Health Care | 🇨🇭 Sion | 9 | 2024 |
| 22 | [imvista SA](https://www.tamtam.ai/c/imvista-sa) (imvista.ch)<br>Specialized in real estate development and construction in the Valais region, serving institutional Swiss investors and private clients with residential and commercial projects Aim to be a trusted partner in the local real estate market | Real Estate | 🇨🇭 Sion | 7 | 2011 |
| 23 | [EnergiQ](https://www.tamtam.ai/c/energiq) (energiq.ch)<br>EnergiQ SA specializes in renewable energy solutions in Valais, offering holistic approaches for evolving energy needs and promoting independence Contact for sustainable energy future | Services for Renewable Energy | 🇨🇭 Sion | 5 | 2024 |
| 24 | [bolay.co SA](https://www.tamtam.ai/c/bolay-co-sa) (bolay.co)<br>Specialized in high availability and low power electronic systems for remote infrastructure monitoring and control, an Engineering Services Company develops innovative solutions | IT Services and IT Consulting | 🇨🇭 Sion | 5 | 2012 |
| 25 | [Intersanté SA, Switzerland](https://www.tamtam.ai/c/intersante-sa-switzerland) (intersante.com)<br>Specializing in marketing and sales of medical devices for human and animal health, including wound management, disposable products, and innovative equipment in the EU market | Pharmaceutical Manufacturing | 🇨🇭 Sion | 5 | 1982 |
| 26 | [Valcoris & Partners](https://www.tamtam.ai/c/valcoris-and-partners) (valcoris.ch)<br>Specializing in national and international consulting, our company provides objective, personalized advice in private and professional aspects, offering tailored services for clients' needs | Investment Management | 🇨🇭 Sion | 4 | 2003 |
| 27 | [aeChem Life Technologies Sàrl](https://www.tamtam.ai/c/aechem-life-technologies-sarl) (aechem.ch)<br>Revolutionizing diagnostic industry with state-of-the-art technology for accurate detection of low-concentration biomarkers, improving therapeutic outcomes for patients globally | Biotechnology Research | 🇨🇭 Sion | 3 |  |
| 28 | [Nexnet Europe](https://www.tamtam.ai/c/nexnet-europe) (getnextnet.com)<br>Nextnet specializes in generative AI for life sciences, utilizing a large biomedical knowledge graph and proprietary large language models for knowledge discovery in biotechnology | IT Services and IT Consulting | 🇨🇭 Sion | 2 | 2020 |
| 29 | [Labsit Europe](https://www.tamtam.ai/c/labsit-europe) (labsit.ch)<br>Innovative company focused on creating transformative experiences and crafting success stories through cutting-edge solutions | Software Development | 🇨🇭 Sion | 2 |  |
| 30 | [Moser & Barras services immobiliers sàrl](https://www.tamtam.ai/c/moser-and-barras-services-immobiliers-sarl) (moserbarras.ch)<br>Real estate services company founded in 2015, offering property management and condominium administration with a focus on trust, integrity, and availability | Real Estate | 🇨🇭 Sion | 2 | 2015 |
| 31 | [CECIM - Centre de compétences immobilières](https://www.tamtam.ai/c/cecim-centre-de-competences-immobilieres) (cecim.ch)<br>CECIM offers personalized and professional real estate services to institutional clients, individuals, and real estate professionals, focusing on tailored, high-value projects | Real Estate | 🇨🇭 Sion | 2 |  |
| 32 | [123immo.ch](https://www.tamtam.ai/c/123immo-ch) (123immo.ch)<br>Real estate agency in Sion, Switzerland, specializing in buying, selling, and appraising houses, villas, apartments, chalets, land, and buildings in various locations | Real Estate Agents and Brokers | 🇨🇭 Sion | 2 | 2004 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## The same list elsewhere in Switzerland

- [The largest companies in Switzerland](https://www.tamtam.ai/l/largest-companies-switzerland) (6,776)
- [The largest companies in Canton of Zurich](https://www.tamtam.ai/l/largest-companies-canton-of-zurich) (1,668)
- [The largest companies in Vaud](https://www.tamtam.ai/l/largest-companies-vaud) (1,076)
- [The largest companies in Canton of Geneva](https://www.tamtam.ai/l/largest-companies-canton-of-geneva) (867)
- [The largest companies in Canton of Zug](https://www.tamtam.ai/l/largest-companies-canton-of-zug) (425)
- [The largest companies in Canton of Bern](https://www.tamtam.ai/l/largest-companies-canton-of-bern) (420)
- [The largest companies in Ticino](https://www.tamtam.ai/l/largest-companies-ticino) (253)
- [The largest companies in St. Gallen](https://www.tamtam.ai/l/largest-companies-st-gallen) (211)
- [The largest companies in Aargau](https://www.tamtam.ai/l/largest-companies-aargau) (206)
- [The largest companies in Canton of Lucerne](https://www.tamtam.ai/l/largest-companies-canton-of-lucerne) (206)
- [The largest companies in Basel-Stadt](https://www.tamtam.ai/l/largest-companies-basel-stadt) (191)
- [The largest companies in Canton of Neuchâtel](https://www.tamtam.ai/l/largest-companies-canton-of-neuchatel) (142)
- [The largest companies in Basel-Landschaft](https://www.tamtam.ai/l/largest-companies-basel-landschaft) (129)
- [The largest companies in Canton of Fribourg](https://www.tamtam.ai/l/largest-companies-canton-of-fribourg) (129)
- [The largest companies in Valais](https://www.tamtam.ai/l/largest-companies-valais) (100)
- [The largest companies in Schwyz](https://www.tamtam.ai/l/largest-companies-schwyz) (94)
- [The largest companies in Zurich](https://www.tamtam.ai/l/largest-companies-zurich) (1,143)
- [The largest companies in Geneva](https://www.tamtam.ai/l/largest-companies-geneva) (649)
- [The largest companies in Lausanne](https://www.tamtam.ai/l/largest-companies-lausanne) (316)
- [The largest companies in Zug](https://www.tamtam.ai/l/largest-companies-zug) (263)
- [The largest companies in Bern](https://www.tamtam.ai/l/largest-companies-bern) (185)
- [The largest companies in Basel](https://www.tamtam.ai/l/largest-companies-basel) (184)
- [The largest companies in Lugano](https://www.tamtam.ai/l/largest-companies-lugano) (115)
- [The largest companies in Baar](https://www.tamtam.ai/l/largest-companies-baar) (93)

## The same list elsewhere

- [The largest companies in the world](https://www.tamtam.ai/l/largest-companies-in-the-world) (415,122)
- [The largest companies in Europe](https://www.tamtam.ai/l/largest-companies-in-europe) (213,553)

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Source: https://www.tamtam.ai/l/largest-companies-sion