3XN is a Danish architectural practice with head office in Copenhagen. The company was founded in Århus in 1986 as Nielsen, Nielsen & Nielsen (later 3 X Nielsen) by Kim Herforth Nielsen, Lars Frank Nielsen and Hans Peter Svendler Nielsen.

3XN believes that buildings are more than the sum of their parts and constantly seek to achieve a synthesis of design, function, and context. Recently 3XN has won the competition to design the new headquarters for Swedbank in Stockholm and another Swedish residential project in Vällingby. 3XN is also present in Norway with projects such as the Theatre and Jazz House in Molde and a Culture House in Mandal.

Founded: 1986
Headquarters: Copenhagen, Denmark
Revenue: updating
Website: https://gxn.3xn.com/project/ioc-workflow

Arkitema Architects is a Danish-based architectural firm headquartered in Aarhus, with branch offices in Copenhagen, Malmö, Stockholm, and Oslo. Arkitema Architects was founded in 1969 in Aarhus, and nowadays has about 400 employees with its main activity in Scandinavia.

Arkitema Architects is owned by Danish engineering company Cowi. There are 113 companies in the Arkitema K/S corporate family. Arkitema has designed a broad range of architectural projects, from minor expansions and renovations to large redevelopment, infrastructural, residential, and urban design projects. Some of the most notable and representative projects from Arkitema include VIA University College Campus Aarhus C, Aarhus (2015) - Educational institution, Aarhus City Tower, Aarhus (2014) - High-rise hotel

Founded: 1969
Headquarters: Aarhus, Denmark
Revenue: $87.11 million
Website: https://www.arkitema.com/en/about

Bjarke Ingels Group(BIG), is a Copenhagen and New York-based group of architects, designers, and builders operating within the fields of architecture, urbanism, research, and development. The office is currently involved in a large number of projects throughout Europe, North America, Asia, and the Middle East. As of 2021, the company employs 500 people.

Bjarke Ingels and Julien De Smedt established the company PLOT in Copenhagen in January 2001, as a focus for their architectural practice. Ingels established BIG in late 2005 after he and De Smedt closed down PLOT. This drew acclaim for its first completed commission, the Mountain, a residential project in Copenhagen which had been started by PLOT.

Founded: 2005
Headquarters: Copenhagen, Denmark & New York, USA
Revenue: $41.97 million
Website: http://www.big.dk/

BDP was founded in 1961 by George Grenfell-Baines with architects Bill White and John Wilkinson, quantity surveyor Arnold Towler and eight associate partners. The associates were made full equity partners in 1964. Design Partnership Ltd is located in Manchester, United Kingdom, and is part of the Architectural, Engineering, and Related Services Industry. Building Design Partnership Ltd has 1,086 employees at this location and generates $160.01 million in sales (USD). There are 194 companies in the Building Design Partnership Ltd corporate family.

As of 2016, BDP was reported to be the UK's second-largest architecture firm, with 950 employees. In March 2016, the Japanese engineering firm Nippon Koei bought all of the stock of BDP for a total sale price of £102.2 millionIn June 2020, BDP announced plans to make up to 70 UK staff redundant, blaming uncertainty arising from the ongoing COVID-19 pandemic and Brexit.

Founded: 1961
Headquarters: 11 Ducie Street, Piccadilly Gardens, Manchester, England
Revenue: $160.01 million
Website: http://www.bdp.com/

Arkitektfirmaet C. F. Møller(C. F. Møller Architects) is a Denmark-based architectural firm in Århus. Founded in 1924 by C. F. Møller, it is today the largest architectural firm in Denmark based on the number of employed architects. About half the revenue is earned outside Denmark. Besides the main office in Århus, the firm has offices in Copenhagen, Oslo, London and in 2007 it bought the Stockholm-based Swedish architectural practice Berg Arkitekter which is still operated under its own name.

Current projects include the largest hospital project ever to be built in Denmark in Århus, an extension of the National Maritime Museum in London, and several highrise projects in Norway, Sweden, and Denmark. C. F. Møller is also one of the 15 architecture practices that collaborated in the overall design of the Olympic Village for the 2012 Summer Olympics in London.

Founded: 1924
Headquarters: Aarhus, Denmark
Revenue: $10 Million
Website: https://www.cfmoller.com/

Foster + Partners is a British architectural, engineering, and integrated design practice founded in 1967 as Foster Associates by Norman Foster. It is the largest architectural firm in the UK with over 1,500 employees in 13 studios worldwide.

Foster + Partners is part of the Architectural, Engineering, and Related Services Industry. Foster + Partners has 1,434 total employees across all of its locations and generates $330.85 million in sales (USD). There are 18 companies in the FFoster + Partners corporate family. In October 2021, Foster + Partners was bought by a Canadian private investment firm Hennick & Company for an undisclosed sum, making it the single biggest shareholder of the practice. Foster will retain a controlling interest.

Founded: 1967
Headquarters: London, UK
Revenue: $330.85 million
Website: https://www.fosterandpartners.com/

Grimshaw Architects is an architectural firm headquartered in London. Founded in 1980 by Sir Nicholas Grimshaw, the firm was one of the pioneers of high-tech architecture. In particular, they are known for their design of transport projects including Amsterdam Bijlmer ArenA railway station, Waterloo International railway station, and the award-winning Southern Cross railway station which was the recipient of the Royal Institute of British Architects Lubetkin Prize.

Grimshaw is behind the design of the Sustainability Pavilion, an innovative net-zero building, for Expo 2020. The firm currently has offices in Los Angeles, New York, London, Paris, Dubai, Melbourne, and Sydney, employing over 600 staff.

Founded: 1980
Headquarters: London, United Kingdom
Revenue: $154.48 million
Website: https://grimshaw.global/

Henning Larsen Architects is an international architectural firm based in Copenhagen, Denmark. Founded in 1959 by Henning Larsen, it has around 750 employees. Then, as time passes by, offices in Riyadh, Saudi Arabia, and Munich, Germany were inaugurated respectively. The company also has operate some other offices in New York USA, Oslo, Norway, in the Faroe Islands, and in Hong Kong, China.

Henning Larsen Architects is known for its cultural and educational projects. Among them Harpa Concert Hall and Conference Centre in Reykjavík was selected as one of the ten best concert halls in the world by the British magazine Gramophone and won the Mies van der Rohe Award 2013, the European Union Prize for Contemporary Architecture. It also designed the Copenhagen Opera.

Founded: 1959
Headquarters: Copenhagen, Denmark
Revenue: $83.56 million
Website: https://henninglarsen.com/en

Herzog & de Meuron Basel Ltd., or Herzog & de Meuron Architekten is a Swiss architecture firm with its head office in Basel, Switzerland. Herzog & de Meuron was founded in Basel in 1978. In 2001, Herzog & de Meuron were awarded the Pritzker Prize, the highest of honors in architecture.In 2006, The New York Times Magazine called them "one of the most admired architecture firms in the world.

Herzog & de Meuron Architekten has about 200 total employees across all of its locations and generates $20.31 million in sales (USD). There are 12 companies in the Herzog & de Meuron Architekten AG corporate family.

Founded: 1978
Headquarters: Basel, Switzerland
Revenue: $20.31 million
Website: http://www.herzogdemeuron.com/

The HPP Architekten GmbH is a nationally and internationally operating German architectural firm headquartered in Dusseldorf. As an architectural partnership, HPP is represented with a total of twelve office locations in Germany, China and Turkey and employs 450 people. The subsidiaries HPP International Planungsgesellschaft mbH and HPP Service GmbH are also registered in Germany.

HPP's range of services includes urban development, architecture and interior design, district and urban planning as well as revitalization, general planning, and project management. The building typologies include the areas of corporate headquarters, office and administration buildings, hotel and residential construction, hospital buildings, sports and leisure facilities, cultural buildings, shopping centers, buildings for teaching and research, industrial and transport buildings.

Founded: 1997
Headquarters: Dusseldorf, Germany
Revenue: $24.36 million
Website: http://www.hpp.com/