# The 30 largest professional services firms in Oslo

Tamtam tracks 53 professional services firms headquartered in Oslo. This list ranks the 30 largest by number of employees on LinkedIn, led by Multiconsult, Bouvet ASA and PwC Norway. Their median headcount is 554. Half of them were founded in 2000 or later.

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.

🇳🇴 Oslo · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Multiconsult](https://www.tamtam.ai/c/multiconsult) (multiconsult.no)<br>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 | 🇳🇴 Oslo | 3,018 | 1908 |
| 2 | [Bouvet ASA](https://www.tamtam.ai/c/bouvet-asa) (bouvet.no)<br>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 | 🇳🇴 Oslo | 2,325 | 2002 |
| 3 | [PwC Norway](https://www.tamtam.ai/c/pwc-norway) (pwc.no)<br>A leading global professional services firm with deep expertise in auditing, advisory, and legal services, operating in 155 countries worldwide | Business Consulting and Services | 🇳🇴 Oslo | 1,802 |  |
| 4 | [AGR](https://www.tamtam.ai/c/agr) (agr.com)<br>A multi-disciplinary engineering consultancy and software provider specializing in energy solutions, including well management, CCUS, hydrogen, geothermal, and seabed minerals | Oil and Gas | 🇳🇴 Oslo | 1,596 | 1987 |
| 5 | [AIDER](https://www.tamtam.ai/c/aider) (aider.no)<br>A leading competence house redefining the accounting industry with a focus on technology and skilled professionals to help leaders succeed | Accounting | 🇳🇴 Oslo | 1,540 | 2019 |
| 6 | [KPMG Norway](https://www.tamtam.ai/c/kpmg-norway) (kpmg.com)<br>Providing audit, consulting, legal services with focus on cybersecurity, sustainability, technology, and future-oriented business solutions for clients. | Business Consulting and Services | 🇳🇴 Oslo | 1,514 |  |
| 7 | [BDO Norge](https://www.tamtam.ai/c/bdo-norge) (bdo.no)<br>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 | 🇳🇴 Oslo | 1,471 | 1913 |
| 8 | [Rystad Energy](https://www.tamtam.ai/c/rystad-energy) (rystadenergy.com)<br>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 | 🇳🇴 Oslo | 939 | 2004 |
| 9 | [99x](https://www.tamtam.ai/c/99x) (99x.io)<br>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 | 🇳🇴 Oslo | 745 |  |
| 10 | [Varejo ✨](https://www.tamtam.ai/c/varejo) (bloomoslo.no)<br>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 | 🇳🇴 Oslo | 643 | 2013 |
| 11 | [NoA - The North Alliance](https://www.tamtam.ai/c/noa-the-north-alliance) (thenorthalliance.com)<br>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 | 🇳🇴 Oslo | 623 | 2014 |
| 12 | [Itera](https://www.tamtam.ai/c/itera-oslo) (itera.com)<br>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 | 🇳🇴 Oslo | 618 | 1999 |
| 13 | [Personalhuset Norway](https://www.tamtam.ai/c/personalhuset-norway) (personalhuset.no)<br>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 | 🇳🇴 Oslo | 611 | 2001 |
| 14 | [Bekk](https://www.tamtam.ai/c/bekk) (bekk.no)<br>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 | 🇳🇴 Oslo | 604 | 2000 |
| 15 | [LINK Arkitektur](https://www.tamtam.ai/c/link-arkitektur) (linkarkitektur.com)<br>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 | 🇳🇴 Oslo | 554 | 2000 |
| 16 | [TRY Apt](https://www.tamtam.ai/c/try-apt) (try.no)<br>Innovative interactive experience provider bridging online and traditional advertising, delivering creative solutions using technology, experience and strategic knowledge | Advertising Services | 🇳🇴 Oslo | 540 | 1999 |
| 17 | [HRP](https://www.tamtam.ai/c/hrp) (hrpas.no)<br>Specializing in project management for construction and infrastructure projects, we aim to be a leading contributor to Norwegian society's development and success | Construction | 🇳🇴 Oslo | 533 | 2005 |
| 18 | [TolkeNett AS](https://www.tamtam.ai/c/tolkenett-as) (tolkenett.no)<br>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 | 🇳🇴 Oslo | 518 | 2003 |
| 19 | [Jobzone Norge AS](https://www.tamtam.ai/c/jobzone-norge-as) (jobzone.no)<br>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 | 🇳🇴 Oslo | 495 | 2002 |
| 20 | [NGI - Norwegian Geotechnical Institute](https://www.tamtam.ai/c/ngi-norwegian-geotechnical-institute) (ngi.no)<br>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 | 🇳🇴 Oslo | 480 | 1953 |
| 21 | [Thommessen](https://www.tamtam.ai/c/thommessen) (thommessen.no)<br>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 | 🇳🇴 Oslo | 479 | 1856 |
| 22 | [Wikborg Rein](https://www.tamtam.ai/c/wikborg-rein) (wr.no)<br>An international law firm based in Oslo, with offices in Bergen, London, Singapore, and Shanghai, offering expert legal assistance across various industries | Law Practice | 🇳🇴 Oslo | 465 | 1923 |
| 23 | [Webstep](https://www.tamtam.ai/c/webstep) (webstep.no)<br>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 | 🇳🇴 Oslo | 430 | 2000 |
| 24 | [WSP i Norge](https://www.tamtam.ai/c/wsp-i-norge) (wsp.com)<br>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 | 🇳🇴 Oslo | 416 | 1997 |
| 25 | [BAHR – law firm](https://www.tamtam.ai/c/bahr-law-firm) (bahr.no)<br>Leading Norwegian law practice with over 160 lawyers providing domestic and international legal services in commercial law, transactions, and dispute resolution | Law Practice | 🇳🇴 Oslo | 406 | 1966 |
| 26 | [Amesto](https://www.tamtam.ai/c/amesto) (amesto.no)<br>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 | 🇳🇴 Oslo | 403 | 2002 |
| 27 | [Wiersholm](https://www.tamtam.ai/c/wiersholm) (wiersholm.no)<br>Leading Norwegian law firm specializing in business law, offering clear and responsible advice to clients committed to societal development and sustainability | Law Practice | 🇳🇴 Oslo | 394 | 1875 |
| 28 | [Field](https://www.tamtam.ai/c/field-oslo) (fieldgeo.com)<br>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 | 🇳🇴 Oslo | 369 | 2004 |
| 29 | [Metier](https://www.tamtam.ai/c/metier-oslo) (metier.no)<br>A company specializing in project management, business development, and digital transformation with a strong history of collaboration and making meaningful change | Business Consulting and Services | 🇳🇴 Oslo | 358 | 1982 |
| 30 | [Computas AS](https://www.tamtam.ai/c/computas-as) (computas.com)<br>Nordic provider of IT solutions and consulting, specializing in cloud solutions, AI, and machine learning, with expertise in system development and digitization processes | IT Services and IT Consulting | 🇳🇴 Oslo | 340 | 1985 |

## 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

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- [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)
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- [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)
- [Companies with in-house R&D in Oslo](https://www.tamtam.ai/l/r-and-d-companies-oslo) (50)
- [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

- [Professional services firms in Norway](https://www.tamtam.ai/l/professional-services-firms-norway) (116)

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Source: https://www.tamtam.ai/l/professional-services-firms-oslo