# Top 50 professional services firms in Norway
Tamtam tracks 116 professional services firms headquartered in Norway. This list ranks the 50 largest by number of employees on LinkedIn, led by OSM Thome, Norconsult and Multiconsult. Their median headcount is 638. Half of them were founded in 1987 or later. The most common headquarters are Oslo (28), Stavanger (4) and Bergen (2).
This selection of Norwegian professional services firms includes large, established companies as well as some younger ones. They span various sectors from maritime services and civil engineering to IT consulting and financial advisory. Notable firms include OSM Thome, a provider of technical and digital asset management for the offshore and maritime industry, and Norconsult, a multidisciplinary consultancy in engineering, design, and project management.
Other significant companies are Multiconsult, offering diverse consulting and engineering services, and Bouvet ASA, which specializes in technology, communication, and management. A clear pattern is the concentration of headquarters in Oslo, indicating the capital's role as a central hub for professional services in Norway.
π³π΄ Norway Β· 50 companies Β· Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [OSM Thome](https://www.tamtam.ai/c/osm-thome) (osmthome.com)
A leading provider of technical and digital asset management services to the offshore and maritime industry, ensuring customer success around the clock | Maritime | π³π΄ Arendal | 7,561 | 1963 |
| 2 | [Norconsult](https://www.tamtam.ai/c/norconsult) (norconsult.no)
Multidisciplinary consultancy offering engineering, design, planning, and project management services across public and private sectors globally. | Civil Engineering | π³π΄ Sandvika | 4,574 | 1929 |
| 3 | [Multiconsult](https://www.tamtam.ai/c/multiconsult) (multiconsult.no)
Multiconsult offers a wide range of consulting, engineering, and design services in various sectors, with a focus on meeting customer expectations and achieving satisfaction | Construction | π³π΄ Oslo | 3,018 | 1908 |
| 4 | [Bouvet ASA](https://www.tamtam.ai/c/bouvet-asa) (bouvet.no)
Leading Scandinavian consulting company providing technology, communication, and management services. Offers development and advisory services to public and private sector clients. | IT Services and IT Consulting | π³π΄ Oslo | 2,325 | 2002 |
| 5 | [PwC Norway](https://www.tamtam.ai/c/pwc-norway) (pwc.no)
A leading global professional services firm with deep expertise in auditing, advisory, and legal services, operating in 155 countries worldwide | Business Consulting and Services | π³π΄ Oslo | 1,802 | |
| 6 | [AGR](https://www.tamtam.ai/c/agr) (agr.com)
A multi-disciplinary engineering consultancy and software provider specializing in energy solutions, including well management, CCUS, hydrogen, geothermal, and seabed minerals | Oil and Gas | π³π΄ Oslo | 1,596 | 1987 |
| 7 | [AIDER](https://www.tamtam.ai/c/aider) (aider.no)
A leading competence house redefining the accounting industry with a focus on technology and skilled professionals to help leaders succeed | Accounting | π³π΄ Oslo | 1,540 | 2019 |
| 8 | [KPMG Norway](https://www.tamtam.ai/c/kpmg-norway) (kpmg.com)
Providing audit, consulting, legal services with focus on cybersecurity, sustainability, technology, and future-oriented business solutions for clients. | Business Consulting and Services | π³π΄ Oslo | 1,514 | |
| 9 | [BDO Norge](https://www.tamtam.ai/c/bdo-norge) (bdo.no)
This company offers client-focused services with local expertise, delivering professional solutions and creating unique experiences, serving global to small enterprises | Business Consulting and Services | π³π΄ Oslo | 1,471 | 1913 |
| 10 | [Deloitte Norway](https://www.tamtam.ai/c/deloitte-norway) (deloitte.com)
Global network offering audit, consulting, financial advisory, risk, and tax services to public and private clients in various industries worldwide | Management Consulting | π³π΄ Oslo | 1,253 | 1916 |
| 11 | [Asplan Viak AS](https://www.tamtam.ai/c/asplan-viak-as) (asplanviak.no)
Provides multidisciplinary consulting in architecture, engineering, planning, and environmental services focusing on sustainable, functional, and client-oriented project solutions. | Civil Engineering | π³π΄ Sandvika | 1,211 | 1958 |
| 12 | [Axess Group](https://www.tamtam.ai/c/axess-group) (axessgroup.com)
Specializing in sustainable solutions for key industries worldwide, we focus on HSEQ to maximize production uptime, safety, and operational efficiency | Oil and Gas | π³π΄ Molde | 1,152 | |
| 13 | [Forsvarets forskningsinstitutt - FFI](https://www.tamtam.ai/c/forsvarets-forskningsinstitutt-ffi) (ffi.no)
Leading technology competence center under the Ministry of Defence with over 800 employees, specializing in research and development in various fields to enhance Norway's defense capabilities | Research Services | π³π΄ Kjeller | 1,017 | 1946 |
| 14 | [Rystad Energy](https://www.tamtam.ai/c/rystad-energy) (rystadenergy.com)
An independent advisory and research firm providing data and insights for decision-making in global energy markets, spanning oil, gas, renewables, and more | Information Services | π³π΄ Oslo | 939 | 2004 |
| 15 | [Rosenberg Worley](https://www.tamtam.ai/c/rosenberg-worley) (worley.com)
A fully-integrated engineering, fabrication, and construction company based in Norway, offering expertise in the energy transition with a genuine approach | Oil and Gas | π³π΄ HundvΓ₯g | 929 | 1896 |
| 16 | [Global Maritime](https://www.tamtam.ai/c/global-maritime) (globalmaritime.com)
Global Maritime provides comprehensive offshore project lifecycle services, specializing in engineering, design, marine warranty surveying, risk management, and decommissioning with innovative solutions | Engineering Services | π³π΄ Stavanger | 846 | 1979 |
| 17 | [Moreld Apply](https://www.tamtam.ai/c/moreld-apply) (apply.no)
A leading engineering company specializing in projects from concept to completion, offering services in maintenance, modifications, system integration, and operations support | Oil and Gas | π³π΄ Stavanger | 782 | 1979 |
| 18 | [99x](https://www.tamtam.ai/c/99x) (99x.io)
A technology company based in Norway, specializing in co-creating innovative digital products for the Scandinavian market and recognized as a top workplace in Asia and Sri Lanka | IT Services and IT Consulting | π³π΄ Oslo | 745 | |
| 19 | [Γ
F Norge](https://www.tamtam.ai/c/af-norge) (afconsult.com)
An international engineering and design firm focusing on energy, industry, and infrastructure, creating sustainable solutions with skilled employees and technology worldwide | Construction | π³π΄ Oslo | 744 | |
| 20 | [Oceaneering Asset Integrity](https://www.tamtam.ai/c/oceaneering-asset-integrity) (oceaneering.com)
A global provider of Integrity and Inspection Services for various industries including oil & gas, nuclear power, construction, offering a range of specialized solutions | Oil and Gas | π³π΄ Bergen | 720 | |
| 21 | [Pedagogisk VikarSentral AS](https://www.tamtam.ai/c/pedagogisk-vikarsentral-as) (pvs.no)
A user-friendly substitute service for all areas of education and childcare, prioritizing quality, continuity, engagement, and availability to support both clients and substitutes | Staffing and Recruiting | π³π΄ Bergen | 702 | 2004 |
| 22 | [APPLY](https://www.tamtam.ai/c/apply-stavanger) (apply.no)
A leading multi-discipline engineering company specializing in oil and gas projects on the Norwegian Continental Shelf, focusing on operations, maintenance, and modifications for improved asset value and performance | Oil and Gas | π³π΄ Stavanger | 699 | |
| 23 | [Nemko](https://www.tamtam.ai/c/nemko) (nemko.com)
The company ensures compliance with global requirements through pre-compliance, international approval, product testing, and certifications, helping to create a safer world | International Trade and Development | π³π΄ Lysaker | 655 | 1933 |
| 24 | [Varejo β¨](https://www.tamtam.ai/c/varejo) (bloomoslo.no)
Retail House Varejo specializes in helping brands and chains connect with customers at the point of purchase through various marketing activities in Nordic countries | Marketing Services | π³π΄ Oslo | 643 | 2013 |
| 25 | [Rosenberg WorleyParsons](https://www.tamtam.ai/c/rosenberg-worleyparsons) (worleyparsons.com)
The company operates in engineering, fabrication, and construction for offshore oil and gas projects, specializing in front end engineering, maintenance, and subsea services | Oil and Gas | π³π΄ | 638 | |
| 26 | [NoA - The North Alliance](https://www.tamtam.ai/c/noa-the-north-alliance) (thenorthalliance.com)
A Nordic-based creative and tech group with over 1200 experts focused on driving customer-driven growth in Sweden, Norway, Denmark, Finland, and Poland | IT Services and IT Consulting | π³π΄ Oslo | 623 | 2014 |
| 27 | [Itera](https://www.tamtam.ai/c/itera-oslo) (itera.com)
A leading international company specializing in technology and digital communication services, enabling customers to accelerate sustainable digital transformation and capture new business opportunities globally | IT Services and IT Consulting | π³π΄ Oslo | 618 | 1999 |
| 28 | [321](https://www.tamtam.ai/c/321) (321.no)
A consultancy firm focused on digitalization and efficiency, offering development of digital solutions and resource leasing in programming, project management, and advisory services | Software Development | π³π΄ Hamar | 612 | 2019 |
| 29 | [Personalhuset Norway](https://www.tamtam.ai/c/personalhuset-norway) (personalhuset.no)
A leading Nordic recruitment and staffing company offering industry-specific services in recruitment, staffing, restructuring, and consulting with a focus on innovation and employee commitment | Staffing and Recruiting | π³π΄ Oslo | 611 | 2001 |
| 30 | [Bekk](https://www.tamtam.ai/c/bekk) (bekk.no)
A Norwegian company with over 500 specialists in strategy, design, and technology, creating innovative solutions for businesses with ambitious goals | IT Services and IT Consulting | π³π΄ Oslo | 604 | 2000 |
| 31 | [LINK Arkitektur](https://www.tamtam.ai/c/link-arkitektur) (linkarkitektur.com)
Architect office in Scandinavia with 500 employees across Denmark, Norway, and Sweden Specializing in sustainable social architecture to improve quality of life | Architecture and Planning | π³π΄ Oslo | 554 | 2000 |
| 32 | [SchjΓΈdt](https://www.tamtam.ai/c/schjodt) (schjodt.com)
Internationally recognized law firm in Scandinavia, specializing in M&A transactions and litigation, known for legal excellence, innovative solutions, and exceptional client service | Law Practice | π³π΄ Sentrum | 540 | 1936 |
| 33 | [TRY Apt](https://www.tamtam.ai/c/try-apt) (try.no)
Innovative interactive experience provider bridging online and traditional advertising, delivering creative solutions using technology, experience and strategic knowledge | Advertising Services | π³π΄ Oslo | 540 | 1999 |
| 34 | [HRP](https://www.tamtam.ai/c/hrp) (hrpas.no)
Specializing in project management for construction and infrastructure projects, we aim to be a leading contributor to Norwegian society's development and success | Construction | π³π΄ Oslo | 533 | 2005 |
| 35 | [TolkeNett AS](https://www.tamtam.ai/c/tolkenett-as) (tolkenett.no)
With 15 years of experience, we offer high-quality interpreting and translation services 24/7 From language editing to writing, we cover all language needs | Translation and Localization | π³π΄ Oslo | 518 | 2003 |
| 36 | [ECIT Norge](https://www.tamtam.ai/c/ecit-norge) (ecit.com)
A well-established Nordic group offering business optimization solutions with 2,500 employees across multiple countries in the Nordics and Europe | Outsourcing and Offshoring Consulting | π³π΄ Fornebu | 499 | |
| 37 | [Jobzone Norge AS](https://www.tamtam.ai/c/jobzone-norge-as) (jobzone.no)
Jobzone is a Norwegian-owned staffing company with a focus on being the most attractive option for job seekers and clients They offer personalized service and prioritize employee well-being | Staffing and Recruiting | π³π΄ Oslo | 495 | 2002 |
| 38 | [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 |
| 39 | [Thommessen](https://www.tamtam.ai/c/thommessen) (thommessen.no)
A leading Norwegian business law firm with offices in Oslo, Bergen, Stavanger, and London, providing comprehensive legal services for Norwegian businesses for 165 years | Law Practice | π³π΄ Oslo | 479 | 1856 |
| 40 | [Wikborg Rein](https://www.tamtam.ai/c/wikborg-rein) (wr.no)
An international law firm based in Oslo, with offices in Bergen, London, Singapore, and Shanghai, offering expert legal assistance across various industries | Law Practice | π³π΄ Oslo | 465 | 1923 |
| 41 | [AFF](https://www.tamtam.ai/c/aff) (aff.no)
A leading leadership and organizational development consultancy in Norway, offering top-rated programs in partnership with NHH - Norwegian School of Economics | Business Consulting and Services | π³π΄ Bergen | 460 | 1952 |
| 42 | [Webstep](https://www.tamtam.ai/c/webstep) (webstep.no)
A profitable technology and consulting firm with 400+ IT experts, providing uncomplicated solutions to complex problems for customers across industries | IT Services and IT Consulting | π³π΄ Oslo | 430 | 2000 |
| 43 | [WSP i Norge](https://www.tamtam.ai/c/wsp-i-norge) (wsp.com)
A leading company in project management, providing services to public and private sectors in industries such as construction, transportation, energy, and industrial sectors | Professional Services | π³π΄ Oslo | 416 | 1997 |
| 44 | [Firesafe](https://www.tamtam.ai/c/firesafe) (firesafe.no)
FireSafe is a total supplier for fire protection services, including consultancy, execution, control, training, and product development for various types of buildings and structures | Fire Protection | π³π΄ LΓΈrenskog | 415 | 1981 |
| 45 | [MDE Group](https://www.tamtam.ai/c/mde-group) (mde-group.com)
Experts in global recruitment, relocation and project support Providing skilled personnel and industry-leading staffing solutions worldwide, ensuring compliance and perfect matches | Staffing and Recruiting | π³π΄ Stavanger | 411 | 2007 |
| 46 | [BAHR β law firm](https://www.tamtam.ai/c/bahr-law-firm) (bahr.no)
Leading Norwegian law practice with over 160 lawyers providing domestic and international legal services in commercial law, transactions, and dispute resolution | Law Practice | π³π΄ Oslo | 406 | 1966 |
| 47 | [SpareBank 1 Regnskapshuset SMN AS](https://www.tamtam.ai/c/sparebank-1-regnskapshuset-smn-as) (sparebank1.no)
Provider of financial services, business and agriculture accounting, property management, and ERP solutions Emphasis on local presence with over 40 office locations Part of SpareBank 1 group | Accounting | π³π΄ Trondheim | 404 | 1985 |
| 48 | [Amesto](https://www.tamtam.ai/c/amesto) (amesto.no)
A family-owned business specializing in business solutions, artificial intelligence, IT services, accounting, HR, and staffing, promoting a culture of inquiry and sustainability | IT Services and IT Consulting | π³π΄ Oslo | 403 | 2002 |
| 49 | [Wiersholm](https://www.tamtam.ai/c/wiersholm) (wiersholm.no)
Leading Norwegian law firm specializing in business law, offering clear and responsible advice to clients committed to societal development and sustainability | Law Practice | π³π΄ Oslo | 394 | 1875 |
| 50 | [Field](https://www.tamtam.ai/c/field-oslo) (fieldgeo.com)
This company captures, processes, and delivers accurate geospatial information, helping organizations make better decisions for planning, building, and managing environments across the Nordics. | Surveying and Mapping Services | π³π΄ Oslo | 369 | 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 11, 2026.
## More company lists in Norway
- [The largest companies in Norway](https://www.tamtam.ai/l/largest-companies-norway) (2,027)
- [Multinational companies in Norway](https://www.tamtam.ai/l/multinational-companies-norway) (556)
- [Retail chains in Norway](https://www.tamtam.ai/l/retail-chains-norway) (225)
- [Critical infrastructure operators in Norway](https://www.tamtam.ai/l/critical-infrastructure-operators-norway) (220)
- [Software Development companies in Norway](https://www.tamtam.ai/l/software-development-companies-norway) (216)
- [SaaS companies in Norway](https://www.tamtam.ai/l/saas-companies-norway) (201)
- [Government Administration companies in Norway](https://www.tamtam.ai/l/government-administration-companies-norway) (169)
- [Companies with in-house R&D in Norway](https://www.tamtam.ai/l/r-and-d-companies-norway) (162)
- [Financial services firms in Norway](https://www.tamtam.ai/l/financial-services-firms-norway) (141)
- [Public sector organisations in Norway](https://www.tamtam.ai/l/public-sector-organisations-norway) (132)
- [Manufacturers in Norway](https://www.tamtam.ai/l/manufacturers-norway) (130)
- [Energy companies in Norway](https://www.tamtam.ai/l/energy-companies-norway) (107)
- [IT Services and IT Consulting companies in Norway](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-norway) (103)
- [Hardware manufacturers in Norway](https://www.tamtam.ai/l/hardware-companies-norway) (102)
- [Corporate groups and holding companies in Norway](https://www.tamtam.ai/l/holding-companies-norway) (100)
- [Publicly traded companies in Norway](https://www.tamtam.ai/l/publicly-traded-companies-norway) (99)
- [Financial Services companies in Norway](https://www.tamtam.ai/l/financial-services-companies-norway) (95)
- [Education providers in Norway](https://www.tamtam.ai/l/education-companies-norway) (94)
- [Healthcare providers in Norway](https://www.tamtam.ai/l/healthcare-providers-norway) (94)
- [Companies with a mobile app in Norway](https://www.tamtam.ai/l/companies-with-mobile-app-norway) (89)
- [Subscription businesses in Norway](https://www.tamtam.ai/l/subscription-businesses-norway) (84)
- [IT services companies in Norway](https://www.tamtam.ai/l/it-services-companies-norway) (78)
- [Oil and Gas companies in Norway](https://www.tamtam.ai/l/oil-and-gas-companies-norway) (76)
- [Hotel and hospitality groups in Norway](https://www.tamtam.ai/l/hospitality-groups-norway) (75)
## The same list elsewhere in Norway
- [Professional services firms in Oslo](https://www.tamtam.ai/l/professional-services-firms-oslo) (53)
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Source: https://www.tamtam.ai/l/professional-services-firms-norway