The companies listed in Oslo are predominantly large organizations with significant employee counts, many exceeding 1,000. They operate in diverse sectors, including heavy industry, technology, and public services. Notable examples include Yara International, focused on sustainable crop nutrition; Norsk Hydro, involved in aluminium production and renewable energy; and Visma, which provides business software across Europe and Latin America.
A clear pattern is the strong presence of both public institutions and companies with a global reach. Oslo University Hospital and the University of Oslo represent major public service and education entities, while companies like Elkem ASA, a global provider of advanced material solutions, and Opera, offering internet products worldwide, demonstrate a strong international orientation from their Oslo headquarters.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Yara Internationalyara.com
A global company focused on sustainable crop nutrition, low-emission energy solutions, and creating a more efficient and nature-positive food value chain |
15,349 | |||
| 2 |
Norsk Hydrohydro.com
Development of sustainable industries including aluminium production, energy, metal recycling, renewables, and batteries with global operations and innovation focus. |
13,192 | |||
| 3 |
Oslo University Hospitaloslo-universitetssykehus.no
Norway's largest hospital with national responsibilities and centers of competence, employing professionals in various disciplines and seeking top talent |
9,103 | |||
| 4 |
University of Oslouio.no
Leading Norwegian university with eight faculties offering education and research in diverse fields including law, medicine, humanities, and sciences. |
8,168 | |||
| 5 | 6,092 | ||||
| 6 | 2,422 | ||||
| 7 | 2,350 | ||||
| 8 |
DeepOceandeepoceangroup.com
Integrated provider of safe, high-quality subsea services and technologies for the offshore industry, focusing on survey, installation, maintenance, and project management globally |
1,800 | |||
| 9 | 1,678 | ||||
| 10 |
Kristiania University of Applied Scienceskristiania.no
Kristiania University College provides a small, interactive learning environment focused on combining theoretical and practical learning to prepare students for their future careers |
1,376 | |||
| 11 |
Glamoxglamox.com
A Norwegian industrial group that develops, manufactures, and distributes sustainable lighting solutions for professional markets worldwide, with a focus on marine, offshore, and building sectors |
996 | |||
| 12 |
Diakonhjemmet sykehusdiakonhjemmetsykehus.no
An ideal local hospital offering medical, surgical, rheumatology, mental health, and specialized treatment for substance use disorders to a wide patient base |
862 | |||
| 13 |
Norske Skognorskeskog.com
Production of bio-products and packaging materials, operating profitable mills, focusing on bio energy, composites, chemicals, and publication paper. |
835 | |||
| 14 | 759 | ||||
| 15 |
Politiets IT-enhetpolitiet.no
A digital transformation of the police force, focusing on user value, cross-functional teams, and a culture of learning and sharing technology expertise |
731 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Orkla Foods Norge ASorklafoods.no
A leading supplier of food and beverages in Norway, specializing in pizza, ready-made meals, soups, sauces, and more under various strong brands |
679 | |||
| 17 | 654 | ||||
| 18 |
LINK Mobilitylinkmobility.com
Provider of scalable mobile messaging services and digital communication solutions enabling businesses to connect with customers across various industries. |
613 | |||
| 19 |
reMarkableremarkable.com
The company offers a tablet that mimics the experience of writing on paper, aiming to replace traditional notebooks and printed documents |
584 | |||
| 20 |
Voice Norge ASvoice.no
Designs and sells clothing collections through 242 stores under brands like Match, VIC, and Decades, with 11 proprietary labels making up 80% of sales. |
516 | |||
| 21 |
mnemonicmnemonic.io
Offers cybersecurity services across Europe, helping businesses manage security risks, protect data, and defend against cyber threats with expert teams and a proprietary platform. |
498 | |||
| 22 |
NGI - Norwegian Geotechnical Institutengi.no
NGI is an international center for research and consultancy in engineering-related geosciences, specializing in finding sustainable solutions for infrastructure and environmental challenges worldwide |
480 | |||
| 23 | 429 | ||||
| 24 |
Unicare Helsepartnerunicare.no
Specialist healthcare provider offering rehabilitation, mental health services, personal assistance, and care for individuals with disabilities, mental illness, and substance abuse issues |
365 | |||
| 25 |
Infrontinfront.co
Provides real-time data and solutions for wealth managers and traders to analyze markets, identify opportunities, and improve client outcomes. |
344 | |||
| 26 |
Banqsoftbanqsoft.com
Provider of financial software solutions for asset finance, digital banking, and credit management organizations in the Nordics Specializes in open architecture and automation |
340 | |||
| 27 |
Stiftelsen Norsk Luftambulansenorskluftambulanse.no
An ideal organization advancing life-saving medical care through air ambulance services, research, education, fundraising, and special training for pilots and medical personnel |
328 | |||
| 28 | 325 | ||||
| 29 |
Nel Hydrogennelhydrogen.com
A hydrogen company listed on the Oslo Stock Exchange, specializing in hydrogen production plants, fueling stations, and power-to-gas solutions for various industries |
323 | |||
| 30 |
Vann- og avl酶psetaten (Oslovann)oslo.kommune.no
The company manages critical water and wastewater infrastructure worth nearly 100 billion NOK, serving over 700,000 residents daily in Oslo |
315 | |||
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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 11, 2026.
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- The largest companies in Oslo 768
- Multinational companies in Oslo 240
- SaaS companies in Oslo 100
- Software Development companies in Oslo 95
- Retail chains in Oslo 92
- Critical infrastructure operators in Oslo 72
- Financial services firms in Oslo 58
- Professional services firms in Oslo 53
- IT Services and IT Consulting companies in Oslo 50
- Public sector organisations in Oslo 50
- Subscription businesses in Oslo 48
- Financial Services companies in Oslo 47
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- Corporate groups and holding companies in Oslo 36
- Retail companies in Oslo 35
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- Manufacturers in Oslo 31
- AI companies in Oslo 30
- Energy companies in Oslo 27