# 30 leading consulting firms in Oslo

Tamtam tracks 37 consulting firms headquartered in Oslo. This list ranks the 30 largest by number of employees on LinkedIn, led by Multiconsult, Bouvet ASA and Zalaris. Their median headcount is 480. Half of them were founded in 2000 or later.

These Oslo-based companies primarily offer consulting services across various sectors. While some are large, established firms like Multiconsult, founded in 1908, and BDO Norge, founded in 1913, there is also a significant presence of younger companies, such as AIDER (2019) and NoA - The North Alliance (2014).

The companies listed include Multiconsult, which provides consulting, engineering, and design services, and Bouvet ASA, a Scandinavian company offering technology, communication, and management services. Zalaris specializes in HR and payroll administration solutions, and AGR is an engineering consultancy and software provider for energy solutions. A notable pattern is the strong representation of IT services and IT consulting firms, with Bouvet ASA, Advania Norge, NoA - The North Alliance, Itera, and Bekk all operating in this field.

🇳🇴 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 | [Zalaris](https://www.tamtam.ai/c/zalaris) (zalaris.com)<br>Providing HR and payroll administration solutions, empowering clients with valuable information to invest in their people, fostering team spirit and achieving high results | Human Resources Services | 🇳🇴 Oslo | 1,822 | 2000 |
| 4 | [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 |  |
| 5 | [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 |
| 6 | [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 |
| 7 | [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 |  |
| 8 | [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 |
| 9 | [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 |
| 10 | [Advania Norge](https://www.tamtam.ai/c/advania-norge) (advania.no)<br>A Northern European IT-services company with over 3,500 employees, helping customers improve performance through innovative use of IT platforms | IT Services and IT Consulting | 🇳🇴 Oslo | 699 | 1939 |
| 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 | [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 |
| 14 | [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 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |
| 19 | [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 |
| 20 | [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 |
| 21 | [VIEW Group Norge](https://www.tamtam.ai/c/view-group-norge) (viewgroup.no)<br>VIEW Ledger is a technology-driven company providing automated systems and outsourcing services for finance and accounting processes since 2004 Serving multinational corporations and small businesses | Financial Services | 🇳🇴 Oslo | 331 | 2004 |
| 22 | [Eiendomshuset Malling & Co](https://www.tamtam.ai/c/eiendomshuset-malling-and-co) (malling.no)<br>This company is a prominent provider of commercial real estate services in Norway, managing a large portfolio and facilitating significant transactions | Real Estate | 🇳🇴 Oslo | 329 | 1964 |
| 23 | [RSM Norge](https://www.tamtam.ai/c/rsm-norge) (rsm.global)<br>A medium-sized audit and advisory firm in Norway, specializing in audit, tax, transactions, and providing tailored services across various industries | Financial Services | 🇳🇴 Oslo | 326 | 1945 |
| 24 | [The Cloud People Global](https://www.tamtam.ai/c/the-cloud-people-global) (thecloudpeople.com)<br>Global ServiceNow Elite partner with expertise in advising, implementing, and managing ServiceNow solutions for maximum value and customer satisfaction | IT Services and IT Consulting | 🇳🇴 Oslo | 316 |  |
| 25 | [Tet](https://www.tamtam.ai/c/tet) (aider.no)<br>We specialize in accounting, advisory, and system solutions to empower decision-making for future-proof businesses, fostering development, innovation, and growth | Accounting | 🇳🇴 Oslo | 306 | 2007 |
| 26 | [Arribatec Group](https://www.tamtam.ai/c/arribatec-group) (arribatec.com)<br>Global provider of digital business solutions, focusing on ERP, system integration, and CPM Emphasizing innovative use of IT for competitive advantage | IT Services and IT Consulting | 🇳🇴 Oslo | 294 |  |
| 27 | [Nord Pool](https://www.tamtam.ai/c/nord-pool) (nordpoolgroup.com)<br>Europe's leading power market offering efficient trading, clearing, and settlement services across multiple countries, with 30 years of experience in the industry | Services for Renewable Energy | 🇳🇴 Oslo | 186 | 1993 |
| 28 | [Blank AS](https://www.tamtam.ai/c/blank-as) (blank.no)<br>A unique consultancy focused on helping Norwegian businesses achieve their digital service development goals through design, consulting, and development services | IT Services and IT Consulting | 🇳🇴 Oslo | 56 | 2015 |
| 29 | [Clave Consulting](https://www.tamtam.ai/c/clave-consulting) (clave.no)<br>IT consulting firm offering services in user experience, software development, advisory, and architecture, dedicated to providing the best advice and creating new opportunities for clients | IT Services and IT Consulting | 🇳🇴 Oslo | 38 | 2015 |
| 30 | [Tellmann Executive Advisors AS](https://www.tamtam.ai/c/tellmann-executive-advisors-as) (tellmann.no)<br>A leading independent advisory firm specializing in ERP renewal, business solutions, and IT organization, driving digital transformation for businesses of all sizes and industries | Business Consulting and Services | 🇳🇴 Oslo | 34 | 1999 |

## 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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- [Professional services firms in Oslo](https://www.tamtam.ai/l/professional-services-firms-oslo) (53)
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- [Government Administration companies in Oslo](https://www.tamtam.ai/l/government-administration-companies-oslo) (37)
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- [Companies with a mobile app in Oslo](https://www.tamtam.ai/l/companies-with-mobile-app-oslo) (36)
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- [Manufacturers in Oslo](https://www.tamtam.ai/l/manufacturers-oslo) (31)
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- [Energy companies in Oslo](https://www.tamtam.ai/l/energy-companies-oslo) (27)

## The same list elsewhere in Norway

- [Consulting firms in Norway](https://www.tamtam.ai/l/consulting-firms-norway) (72)

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