This selection of professional services firms in Oslo includes a mix of large, established companies and more recent firms. Key players include Multiconsult, offering engineering and design services; Bouvet ASA, a consulting company focused on technology, communication, and management; PwC Norway, providing auditing, advisory, and legal services; and AGR, an engineering consultancy specializing in energy solutions. The sector also features IT services firms like Itera and marketing specialists such as Varejo.
A notable pattern among these companies is their strong focus on technology and digital transformation, even within traditional sectors like accounting, as seen with AIDER. Many firms, such as Rystad Energy, an advisory firm for global energy markets, also serve international or Nordic markets from their Oslo headquarters.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Multiconsultmulticonsult.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 |
3,018 | |||
| 2 |
Bouvet ASAbouvet.no
Leading Scandinavian consulting company providing technology, communication, and management services. Offers development and advisory services to public and private sector clients. |
2,325 | |||
| 3 |
PwC Norwaypwc.no
A leading global professional services firm with deep expertise in auditing, advisory, and legal services, operating in 155 countries worldwide |
1,802 | |||
| 4 | 1,596 | ||||
| 5 | 1,540 | ||||
| 6 |
KPMG Norwaykpmg.com
Providing audit, consulting, legal services with focus on cybersecurity, sustainability, technology, and future-oriented business solutions for clients. |
1,514 | |||
| 7 | 1,471 | ||||
| 8 |
Rystad Energyrystadenergy.com
An independent advisory and research firm providing data and insights for decision-making in global energy markets, spanning oil, gas, renewables, and more |
939 | |||
| 9 | 745 | ||||
| 10 |
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 |
643 | |||
| 11 |
NoA - The North Alliancethenorthalliance.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 |
623 | |||
| 12 | 618 | ||||
| 13 |
Personalhuset Norwaypersonalhuset.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 |
611 | |||
| 14 | 604 | ||||
| 15 |
LINK Arkitekturlinkarkitektur.com
Architect office in Scandinavia with 500 employees across Denmark, Norway, and Sweden Specializing in sustainable social architecture to improve quality of life |
554 | |||
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 | 540 | ||||
| 17 | 533 | ||||
| 18 |
TolkeNett AStolkenett.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 |
518 | |||
| 19 |
Jobzone Norge ASjobzone.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 |
495 | |||
| 20 |
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 | |||
| 21 |
Thommessenthommessen.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 |
479 | |||
| 22 |
Wikborg Reinwr.no
An international law firm based in Oslo, with offices in Bergen, London, Singapore, and Shanghai, offering expert legal assistance across various industries |
465 | |||
| 23 |
Webstepwebstep.no
A profitable technology and consulting firm with 400+ IT experts, providing uncomplicated solutions to complex problems for customers across industries |
430 | |||
| 24 |
WSP i Norgewsp.com
A leading company in project management, providing services to public and private sectors in industries such as construction, transportation, energy, and industrial sectors |
416 | |||
| 25 |
BAHR – law firmbahr.no
Leading Norwegian law practice with over 160 lawyers providing domestic and international legal services in commercial law, transactions, and dispute resolution |
406 | |||
| 26 | 403 | ||||
| 27 |
Wiersholmwiersholm.no
Leading Norwegian law firm specializing in business law, offering clear and responsible advice to clients committed to societal development and sustainability |
394 | |||
| 28 |
Fieldfieldgeo.com
This company captures, processes, and delivers accurate geospatial information, helping organizations make better decisions for planning, building, and managing environments across the Nordics. |
369 | |||
| 29 | 358 | ||||
| 30 |
Computas AScomputas.com
Nordic provider of IT solutions and consulting, specializing in cloud solutions, AI, and machine learning, with expertise in system development and digitization processes |
340 | |||
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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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