# The 29 largest companies in Renens

Tamtam tracks 29 companies headquartered in Renens. This list ranks all of them by number of employees on LinkedIn, led by Transports publics de la région lausannoise SA, Interiman Group and Medicalis. Their median headcount is 70. Half of them were founded in 2001 or later.

Renens is home to a diverse group of companies, ranging from established public services to specialized engineering and human resources firms. Notable among them are Transports publics de la région lausannoise SA, which manages public transport in the Lausanne area, and Interiman Group, a provider of temporary staffing services. Other key players include Gruner Stucky Ltd, a leader in dam and hydropower design, and Orange Communications SA, a telecommunications company.

The companies in Renens show a mix of sectors, with a strong presence in engineering, human resources, and telecommunications. Several companies, such as Transports publics de la région lausannoise SA (founded 1896) and Gruner Stucky Ltd (founded 1926), have long histories, indicating a mature business environment. However, there are also younger firms like SWISSto12 (founded 2011), specializing in advanced RF products for satellites.

🇨🇭 Renens · 29 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Transports publics de la région lausannoise SA](https://www.tamtam.ai/c/transports-publics-de-la-region-lausannoise-sa) (t-l.ch)<br>Manage and operate public transport services in Lausanne region, ensuring safe, reliable travel and contributing to sustainable urban development. | Urban Transit Services | 🇨🇭 Renens | 1,204 | 1896 |
| 2 | [Interiman Group](https://www.tamtam.ai/c/interiman-group) (interiman-group.ch)<br>Providing temporary staffing services to thousands of companies and public authorities in Switzerland, focusing on human relations and efficiency. | Human Resources Services | 🇨🇭 Renens | 815 | 1998 |
| 3 | [Medicalis](https://www.tamtam.ai/c/medicalis) (medicalis.ch)<br>Specialist healthcare recruitment agency in Switzerland, providing executives, doctors, and care profiles for various healthcare institutions with personalized and efficient solutions | Human Resources Services | 🇨🇭 Renens | 423 |  |
| 4 | [Gruner Stucky Ltd](https://www.tamtam.ai/c/gruner-stucky-ltd) (gruner.ch)<br>A world leader in dam and hydropower design, providing services for construction, rehabilitation, dam safety studies, energy transmission, and pumped storage | Engineering Services | 🇨🇭 Renens | 312 | 1926 |
| 5 | [Orange Communications SA](https://www.tamtam.ai/c/orange-communications-sa) (orange.com)<br>Connects users with new career opportunities by providing a link to its updated careers page on LinkedIn, showcasing available positions. | Telecommunications | 🇨🇭 Renens | 291 | 1998 |
| 6 | [ECAL University of Art and Design Lausanne](https://www.tamtam.ai/c/ecal-university-of-art-and-design-lausanne) (ecal.ch)<br>A leading art and design school with international recognition, offering a wide range of bachelor and master programs, along with collaborative projects with prestigious firms | Higher Education | 🇨🇭 Renens | 246 | 1821 |
| 7 | [SWISSto12](https://www.tamtam.ai/c/swissto12) (swissto12.com)<br>A leading manufacturer of advanced RF products, satellite payloads, and systems, specializing in 3D printing technology for lightweight, high-performance telecommunications and surveillance solutions | Telecommunications | 🇨🇭 Renens | 224 | 2011 |
| 8 | [swisspro SR SA](https://www.tamtam.ai/c/swisspro-sr-sa) (swisspro.ch)<br>Leading provider of innovative solutions in electrical engineering, communication, and building automation in the French-speaking region of Switzerland, offering comprehensive services from planning to maintenance | Construction | 🇨🇭 Renens | 208 | 2005 |
| 9 | [Phida Construction](https://www.tamtam.ai/c/phida-construction) (phida-groupe.ch)<br>A leading waterproofing company in French-speaking Switzerland, specializing in roofing, founded in 1971 and now directed by Frédéric Aleman | Construction | 🇨🇭 Renens | 199 | 1931 |
| 10 | [MassChallenge Switzerland](https://www.tamtam.ai/c/masschallenge-switzerland) (masschallenge.org)<br>A leader in accelerating startups globally, specializing in climate-responsible businesses They have helped startups raise over CHF 12Bn in funding | Non-profit Organizations | 🇨🇭 Renens | 182 | 2016 |
| 11 | [Groupe Leuba SA](https://www.tamtam.ai/c/groupe-leuba-sa) (groupe-leuba.ch)<br>Family-owned automotive group with 11 modern garages representing 5 renowned brands Providing top-quality services including sales, maintenance, bodywork, parts, tire storage, and renewable energy use | Motor Vehicle Manufacturing | 🇨🇭 Renens | 180 | 1946 |
| 12 | [TESA Technology](https://www.tamtam.ai/c/tesa-technology) (tesatechnology.com)<br>Global leader in precision measurement instruments including height gauges, callipers, micrometers, dial gauges for quality control and inspection. | Industrial Machinery Manufacturing | 🇨🇭 Renens | 157 | 1941 |
| 13 | [GESTE Engineering](https://www.tamtam.ai/c/geste-engineering) (geste.group)<br>A multidisciplinary engineering organization specializing in transportation systems and infrastructure projects, offering innovative solutions worldwide in rail, urban, road, and building sectors | Rail Transportation | 🇨🇭 Renens | 120 | 1999 |
| 14 | [Fondation PROFA](https://www.tamtam.ai/c/fondation-profa) (profa.ch)<br>A public utility foundation in Vaud Canton dedicated to enhancing the quality of emotional, relational, and sexual well-being at every stage of life | Individual and Family Services | 🇨🇭 Renens | 118 |  |
| 15 | [Procimmo SA](https://www.tamtam.ai/c/procimmo-sa) (procimmo.ch)<br>An asset manager of real estate collective investments approved by FINMA, managing property assets worth 4 billion Swiss francs in various funds | Real Estate | 🇨🇭 Renens | 70 | 2007 |
| 16 | [OFISA Informatique SA](https://www.tamtam.ai/c/ofisa-informatique-sa) (o-i.ch)<br>OFISA Informatique SA is an independent software and IT services company in Switzerland, specializing in solutions for government, real estate, finance, and businesses | IT Services and IT Consulting | 🇨🇭 Renens | 64 | 1994 |
| 17 | [Publiaz immobilier SA](https://www.tamtam.ai/c/publiaz-immobilier-sa) (publiaz.ch)<br>An independent real estate company in Vaud, Switzerland, providing a range of property services and managing over 12,000 properties across the region | Real Estate | 🇨🇭 Renens | 40 | 1961 |
| 18 | [NTPT](https://www.tamtam.ai/c/ntpt) (ntpt.tech)<br>NTPT manufactures high performance composites at industrial scale, providing solutions for designing better parts with Thin Ply Technology® and various fiber options | Manufacturing | 🇨🇭 Renens | 32 | 2009 |
| 19 | [TieTalent](https://www.tamtam.ai/c/tietalent) (tietalent.com)<br>A career growth platform for tech professionals, connecting them with exclusive opportunities and companies with the rare talents they need | Technology, Information and Internet | 🇨🇭 Renens | 30 | 2017 |
| 20 | [Hydromea](https://www.tamtam.ai/c/hydromea) (hydromea.com)<br>Hydromea develops a data management platform for underwater applications that improves asset integrity, reduces costs, and minimizes environmental impact | Data Infrastructure and Analytics | 🇨🇭 Renens | 25 | 2014 |
| 21 | [Advice Group](https://www.tamtam.ai/c/advice-group) (advicegroup.ch)<br>A young financial advisory company in French-speaking Switzerland, specializing in insurance, healthcare, taxes, pension, and credit solutions with a focus on quality and customer loyalty | Insurance | 🇨🇭 Renens | 24 |  |
| 22 | [SADIES SA](https://www.tamtam.ai/c/sadies-sa) (sadies.ch)<br>A leading Swiss company specializing in developing management applications for healthcare facilities, providing innovative solutions to optimize care delivery | Software Development | 🇨🇭 Renens | 21 | 2001 |
| 23 | [Junior 42 Lausanne](https://www.tamtam.ai/c/junior-42-lausanne) (j42l.ch)<br>An innovation hub of talented IT students offering tailor-made solutions in software development, cybersecurity, data analysis, and IT consultancy services | IT Services and IT Consulting | 🇨🇭 Renens | 13 | 2023 |
| 24 | [Architecture et Construction](https://www.tamtam.ai/c/architecture-et-construction) (architectes.ch)<br>An architectural and construction information center providing resources and expertise in the industry | Architecture & Planning | 🇨🇭 Renens | 13 |  |
| 25 | [INERGIO](https://www.tamtam.ai/c/inergio) (inergio.ch)<br>A technology company specializing in lightweight and compact fuel cells that operate on various fuels for clean, efficient, and portable energy solutions | Renewable Energy Semiconductor Manufacturing | 🇨🇭 Renens | 11 | 2020 |
| 26 | [KOMP-ACT](https://www.tamtam.ai/c/komp-act) (komp-act.com)<br>Develops integrated electric actuators comparable in price, size, and weight to pneumatic counterparts, aiming to reduce automation industry's energy costs and carbon footprint. | Industrial Machinery Manufacturing | 🇨🇭 Renens | 6 | 2018 |
| 27 | [FIDI SA](https://www.tamtam.ai/c/fidi-sa) (fidisa.ch)<br>Fifty years of real estate management expertise, offering tailored support for property owners with technical, administrative, and financial management, ensuring satisfaction and profitability. | Real Estate | 🇨🇭 Renens | 5 | 1968 |
| 28 | [TECPHY](https://www.tamtam.ai/c/tecphy) (tecphy.ch)<br>Tecphy's interdisciplinary team offers energy concept services, building optimizations, mobility infrastructure upgrades, and industrial equipment modeling They develop clean technology products like BIPV and solar hydrogen production | Renewables & Environment | 🇨🇭 Renens | 5 | 2018 |
| 29 | [L'Immobilier Social](https://www.tamtam.ai/c/l-immobilier-social)<br>The company promotes affordable social housing by offering elegant, energy-efficient apartments at moderate prices with reduced expenses for tenants | Real Estate | 🇨🇭 Renens | 4 | 2016 |

## 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)
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- [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)
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## 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-renens