# Top 30 companies with in-house R&D in Oslo
Tamtam tracks 50 companies with in-house R&D headquartered in Oslo. This list ranks the 30 largest by number of employees on LinkedIn, led by Yara International, Norsk Hydro and Oslo University Hospital. Their median headcount is 731. Half of them were founded in 1996 or later.
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.
π³π΄ Oslo Β· 30 companies Β· Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Yara International](https://www.tamtam.ai/c/yara-international) (yara.com)
A global company focused on sustainable crop nutrition, low-emission energy solutions, and creating a more efficient and nature-positive food value chain | Farming | π³π΄ Oslo | 15,349 | |
| 2 | [Norsk Hydro](https://www.tamtam.ai/c/norsk-hydro) (hydro.com)
Development of sustainable industries including aluminium production, energy, metal recycling, renewables, and batteries with global operations and innovation focus. | Mining | π³π΄ Oslo | 13,192 | 1905 |
| 3 | [Oslo University Hospital](https://www.tamtam.ai/c/oslo-university-hospital) (oslo-universitetssykehus.no)
Norway's largest hospital with national responsibilities and centers of competence, employing professionals in various disciplines and seeking top talent | Hospitals and Health Care | π³π΄ Oslo | 9,103 | |
| 4 | [University of Oslo](https://www.tamtam.ai/c/university-of-oslo-700369) (uio.no)
Leading Norwegian university with eight faculties offering education and research in diverse fields including law, medicine, humanities, and sciences. | Education Administration Programs | π³π΄ Oslo | 8,168 | |
| 5 | [Visma](https://www.tamtam.ai/c/visma) (visma.com)
It provides mission-critical business software to enhance efficiency and resilience for companies and organizations across Europe and Latin America. | Software Development | π³π΄ Oslo | 6,092 | 1996 |
| 6 | [Opera](https://www.tamtam.ai/c/opera) (opera.com)
Provides a range of internet products including browsers, gaming portals, news recommendations, advertising platforms, AI, and Web3 services globally. | Software Development | π³π΄ Oslo | 2,422 | 1995 |
| 7 | [Elkem ASA](https://www.tamtam.ai/c/elkem-asa) (elkem.com)
A global provider of advanced material solutions focused on developing silicones, silicon products, and carbon solutions for a sustainable future | Primary Metal Manufacturing | π³π΄ Oslo | 2,350 | 1904 |
| 8 | [DeepOcean](https://www.tamtam.ai/c/deepocean) (deepoceangroup.com)
Integrated provider of safe, high-quality subsea services and technologies for the offshore industry, focusing on survey, installation, maintenance, and project management globally | Oil and Gas | π³π΄ Oslo | 1,800 | |
| 9 | [PGS](https://www.tamtam.ai/c/pgs) (tgs.com)
Global marine geophysics company using advanced seismic survey technology and cloud computing for energy exploration, transition, renewable energy support, and seabed mineral understanding | Oil and Gas | π³π΄ Oslo | 1,678 | 1991 |
| 10 | [Kristiania University of Applied Sciences](https://www.tamtam.ai/c/kristiania-university-of-applied-sciences) (kristiania.no)
Kristiania University College provides a small, interactive learning environment focused on combining theoretical and practical learning to prepare students for their future careers | Higher Education | π³π΄ Oslo | 1,376 | |
| 11 | [Glamox](https://www.tamtam.ai/c/glamox) (glamox.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 | Appliances, Electrical, and Electronics Manufacturing | π³π΄ Oslo | 996 | |
| 12 | [Diakonhjemmet sykehus](https://www.tamtam.ai/c/diakonhjemmet-sykehus) (diakonhjemmetsykehus.no)
An ideal local hospital offering medical, surgical, rheumatology, mental health, and specialized treatment for substance use disorders to a wide patient base | Hospitals and Health Care | π³π΄ Oslo | 862 | 1890 |
| 13 | [Norske Skog](https://www.tamtam.ai/c/norske-skog) (norskeskog.com)
Production of bio-products and packaging materials, operating profitable mills, focusing on bio energy, composites, chemicals, and publication paper. | Paper and Forest Product Manufacturing | π³π΄ Oslo | 835 | 2017 |
| 14 | [NVE](https://www.tamtam.ai/c/nve) (nve.no)
The company works to manage climate change, renewable energy, infrastructure safety, natural disasters, and international regulations to ensure a sustainable future | Government Administration | π³π΄ Oslo | 759 | |
| 15 | [Politiets IT-enhet](https://www.tamtam.ai/c/politiets-it-enhet) (politiet.no)
A digital transformation of the police force, focusing on user value, cross-functional teams, and a culture of learning and sharing technology expertise | IT Services and IT Consulting | π³π΄ Oslo | 731 | 2014 |
| 16 | [Orkla Foods Norge AS](https://www.tamtam.ai/c/orkla-foods-norge-as) (orklafoods.no)
A leading supplier of food and beverages in Norway, specializing in pizza, ready-made meals, soups, sauces, and more under various strong brands | Food and Beverage Manufacturing | π³π΄ Oslo | 679 | 1963 |
| 17 | [Neat](https://www.tamtam.ai/c/neat-oslo) (neat.no)
Neat designs innovative video devices for virtual meetings, providing crystal-clear audio and video for enhanced hybrid working and learning environments | Telecommunications | π³π΄ Oslo | 654 | 2019 |
| 18 | [LINK Mobility](https://www.tamtam.ai/c/link-mobility) (linkmobility.com)
Provider of scalable mobile messaging services and digital communication solutions enabling businesses to connect with customers across various industries. | Telecommunications | π³π΄ Oslo | 613 | 2000 |
| 19 | [reMarkable](https://www.tamtam.ai/c/remarkable) (remarkable.com)
The company offers a tablet that mimics the experience of writing on paper, aiming to replace traditional notebooks and printed documents | Computers and Electronics Manufacturing | π³π΄ Oslo | 584 | 2013 |
| 20 | [Voice Norge AS](https://www.tamtam.ai/c/voice-norge-as) (voice.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. | Retail Apparel and Fashion | π³π΄ Oslo | 516 | 1987 |
| 21 | [mnemonic](https://www.tamtam.ai/c/mnemonic) (mnemonic.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. | Computer and Network Security | π³π΄ Oslo | 498 | 2000 |
| 22 | [NGI - Norwegian Geotechnical Institute](https://www.tamtam.ai/c/ngi-norwegian-geotechnical-institute) (ngi.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 | Research Services | π³π΄ Oslo | 480 | 1953 |
| 23 | [Flokk](https://www.tamtam.ai/c/flokk) (flokk.com)
Leading European manufacturer of high-quality workplace furniture, with a focus on sustainability and well-being through design collaboration with global experts | Furniture and Home Furnishings Manufacturing | π³π΄ Oslo | 429 | 2007 |
| 24 | [Unicare Helsepartner](https://www.tamtam.ai/c/unicare-helsepartner) (unicare.no)
Specialist healthcare provider offering rehabilitation, mental health services, personal assistance, and care for individuals with disabilities, mental illness, and substance abuse issues | Health and Human Services | π³π΄ Oslo | 365 | 2008 |
| 25 | [Infront](https://www.tamtam.ai/c/infront-oslo) (infront.co)
Provides real-time data and solutions for wealth managers and traders to analyze markets, identify opportunities, and improve client outcomes. | Financial Services | π³π΄ Oslo | 344 | 1998 |
| 26 | [Banqsoft](https://www.tamtam.ai/c/banqsoft) (banqsoft.com)
Provider of financial software solutions for asset finance, digital banking, and credit management organizations in the Nordics Specializes in open architecture and automation | Software Development | π³π΄ Oslo | 340 | 1994 |
| 27 | [Stiftelsen Norsk Luftambulanse](https://www.tamtam.ai/c/stiftelsen-norsk-luftambulanse) (norskluftambulanse.no)
An ideal organization advancing life-saving medical care through air ambulance services, research, education, fundraising, and special training for pilots and medical personnel | Hospitals and Health Care | π³π΄ Oslo | 328 | 1977 |
| 28 | [Pexip](https://www.tamtam.ai/c/pexip) (pexip.com)
It provides seamless video communication solutions for various organizations, focusing on security and innovation across multiple industries and environments. | Software Development | π³π΄ Oslo | 325 | 2012 |
| 29 | [Nel Hydrogen](https://www.tamtam.ai/c/nel-hydrogen) (nelhydrogen.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 | Renewable Energy Equipment Manufacturing | π³π΄ Oslo | 323 | |
| 30 | [Vann- og avlΓΈpsetaten (Oslovann)](https://www.tamtam.ai/c/vann-og-avlopsetaten-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 | Utilities | π³π΄ Oslo | 315 | 1876 |
## 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.
## More company lists in Oslo
- [The largest companies in Oslo](https://www.tamtam.ai/l/largest-companies-oslo) (768)
- [Multinational companies in Oslo](https://www.tamtam.ai/l/multinational-companies-oslo) (240)
- [SaaS companies in Oslo](https://www.tamtam.ai/l/saas-companies-oslo) (100)
- [Software Development companies in Oslo](https://www.tamtam.ai/l/software-development-companies-oslo) (95)
- [Retail chains in Oslo](https://www.tamtam.ai/l/retail-chains-oslo) (92)
- [Critical infrastructure operators in Oslo](https://www.tamtam.ai/l/critical-infrastructure-operators-oslo) (72)
- [Financial services firms in Oslo](https://www.tamtam.ai/l/financial-services-firms-oslo) (58)
- [Professional services firms in Oslo](https://www.tamtam.ai/l/professional-services-firms-oslo) (53)
- [IT Services and IT Consulting companies in Oslo](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-oslo) (50)
- [Public sector organisations in Oslo](https://www.tamtam.ai/l/public-sector-organisations-oslo) (50)
- [Subscription businesses in Oslo](https://www.tamtam.ai/l/subscription-businesses-oslo) (48)
- [Financial Services companies in Oslo](https://www.tamtam.ai/l/financial-services-companies-oslo) (47)
- [Consulting firms in Oslo](https://www.tamtam.ai/l/consulting-firms-oslo) (37)
- [Government Administration companies in Oslo](https://www.tamtam.ai/l/government-administration-companies-oslo) (37)
- [IT services companies in Oslo](https://www.tamtam.ai/l/it-services-companies-oslo) (37)
- [Companies with a mobile app in Oslo](https://www.tamtam.ai/l/companies-with-mobile-app-oslo) (36)
- [Corporate groups and holding companies in Oslo](https://www.tamtam.ai/l/holding-companies-oslo) (36)
- [Retail companies in Oslo](https://www.tamtam.ai/l/retail-companies-oslo) (35)
- [Publicly traded companies in Oslo](https://www.tamtam.ai/l/publicly-traded-companies-oslo) (34)
- [Hotel and hospitality groups in Oslo](https://www.tamtam.ai/l/hospitality-groups-oslo) (33)
- [E-commerce companies in Oslo](https://www.tamtam.ai/l/ecommerce-companies-oslo) (31)
- [Manufacturers in Oslo](https://www.tamtam.ai/l/manufacturers-oslo) (31)
- [AI companies in Oslo](https://www.tamtam.ai/l/ai-companies-oslo) (30)
- [Energy companies in Oslo](https://www.tamtam.ai/l/energy-companies-oslo) (27)
## The same list elsewhere in Norway
- [Companies with in-house R&D in Norway](https://www.tamtam.ai/l/r-and-d-companies-norway) (162)
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Source: https://www.tamtam.ai/l/r-and-d-companies-oslo