Swiss Prime Site
A Swiss listed real estate investment and asset-management group focused on commercial, retail, development, and selected residential properties.
Last updated August 22, 2026
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Overview
Swiss Prime Site AG is a major Swiss real estate investment and asset-management group whose activities center on owning, developing, operating, and managing property. The company is listed on the SIX Swiss Exchange and is primarily oriented toward the Swiss market, especially the economically important metropolitan regions of the Swiss Central Plateau. Its property interests have historically emphasized office buildings, retail locations, mixed-use developments, and other commercial real estate, with selected residential and service-oriented assets complementing the portfolio. The company was established in 1999 by pension funds associated with Credit Suisse and Siemens Switzerland together with Winterthur Life, now part of AXA. It became publicly traded on the SIX Swiss Exchange in April 2000, at which point its real estate portfolio was valued at approximately CHF 500 million. Swiss Prime Site subsequently expanded through acquisitions and development projects. Early transactions included the purchase of office buildings from Swisscom in 2001, the acquisition of the Frey Group in 2003, and the purchase of Maag Holding AG in 2004. In 2009, it took over the listed property company Jelmoli Holding AG, broadening its exposure to retail and urban commercial property. The group also built a services platform alongside its proprietary real estate portfolio. In 2012 it acquired Wincasa, a Swiss real estate services company, and the Tertianum Group. Tertianum was later sold, while Wincasa was announced for sale to Implenia in March 2023. Swiss Prime Site continued to strengthen its asset-management activities through the acquisition of the Akara Group at the end of 2021 and the asset manager of Fundamenta Group at the beginning of 2024. These transactions supported the development of Swiss Prime Site Solutions, which provides real estate investment products and asset-management services for third-party clients. The company’s development record includes major projects such as Prime Tower and its neighboring buildings at the Maag site in Zurich West, Sihlcity in Zurich, the Basler Messeturm, Opus Zug, Schönburg in Bern, YOND, Roter Turm in Winterthur, the PostFinance Arena, and Espace Tourbillon in Geneva. Prime Tower, rising approximately 126 meters, became one of Switzerland’s tallest office buildings and a prominent element of Zurich West’s redevelopment. Swiss Prime Site operates through two closely related economic pillars. The first is the investment portfolio owned or controlled by the group, which produces rental income and gains or losses connected with property values and development. The second is Swiss Prime Site Solutions, an asset-management business that creates and manages tailored real estate investment vehicles and services for institutional and other clients. Reference material describes the total fair value of real estate under management as approximately CHF 27 billion, comprising roughly CHF 13 billion of the group’s own real estate and approximately CHF 14 billion managed through the asset-management segment; these figures are time-sensitive and should be read in the context of the cited reference. Swiss Prime Site’s positioning is therefore that of a large, professionally managed Swiss property platform rather than a consumer-facing real estate brand. Its competitive profile rests on access to high-quality urban and metropolitan properties, development expertise, portfolio management, and the ability to combine direct ownership with third-party asset management. The group remains active, although its structure and business mix have changed through disposals, acquisitions, and the continuing expansion of Swiss Prime Site Solutions.
History
Swiss Prime Site was founded in 1999 by pension funds connected with Credit Suisse and Siemens Switzerland together with Winterthur Life, now associated with AXA. The founders created a platform intended to consolidate and professionally manage Swiss real estate assets. The company listed on the SIX Swiss Exchange in April 2000, when its property portfolio was worth approximately CHF 500 million. Expansion began soon after the listing. In 2001, Swiss Prime Site acquired a portfolio of office buildings from Swisscom. It bought the Frey Group in 2003 and Maag Holding AG in 2004. These transactions increased the company’s presence in office and urban commercial property and contributed to the redevelopment of strategically located sites. In 2009, Swiss Prime Site acquired the publicly traded Jelmoli Holding AG, adding a significant retail and property platform to the group. The company subsequently extended its activities beyond direct real estate ownership. In October 2012, it acquired Wincasa, a Swiss real estate services company, and Tertianum Group, which operated in the senior-living and care sector. Tertianum was later sold after Swiss Prime Site decided to concentrate more closely on its core property and asset-management activities. In March 2023, the group announced the sale of Wincasa to Implenia, another step in refining the structure of its services business. Development has remained an important part of the company’s identity. Swiss Prime Site has participated in major projects including the Prime Tower and adjacent buildings at Zurich’s Maag site, Sihlcity in Zurich, the Basler Messeturm, Opus Zug, Schönburg in Bern, YOND, Roter Turm in Winterthur, the PostFinance Arena, and Espace Tourbillon in Geneva. Prime Tower, at approximately 126 meters, became one of Switzerland’s tallest office buildings and a landmark of Zurich West’s transformation from an industrial district into a mixed-use business area. The asset-management business gained additional scale through the acquisition of the Akara Group at the end of 2021. At the beginning of 2024, Swiss Prime Site acquired the asset manager of Fundamenta Group, further supporting Swiss Prime Site Solutions. This division manages real estate assets for external investors and offers investment structures and services intended to create value over the life cycle of properties. By the 2020s, Swiss Prime Site had developed into a two-part platform: a proprietary real estate investment business and a services-oriented asset-management business. Reference material places the fair value of real estate under management at approximately CHF 27 billion, including approximately CHF 13 billion in the group’s own portfolio and around CHF 14 billion managed through Swiss Prime Site Solutions. Because these values change with transactions and market valuations, they require a dated corporate or financial source for precise reporting. The group’s overall strategy remains focused on Swiss metropolitan real estate, disciplined portfolio management, development, and the expansion of institutional asset management.
- 2024
Fundamenta Group asset-manager transaction
[1]Swiss Prime Site acquires the asset manager of Fundamenta Group to strengthen Swiss Prime Site Solutions.
- 2023
Sale of Wincasa announced
[1]The company announces the sale of Wincasa to Implenia as part of a portfolio and services-business adjustment.
- 2021
Acquisition of Akara Group
[1]Swiss Prime Site acquires Akara Group to reinforce its asset-management platform.
- 2012
Acquisition of Wincasa and Tertianum
[1]The group acquires Wincasa and Tertianum Group, adding property services and senior-living-related operations.
- 2009
Takeover of Jelmoli Holding AG
[1]Swiss Prime Site takes over the listed Jelmoli Holding AG, expanding its retail and urban property interests.
- 2004
Acquisition of Maag Holding AG
[1]The acquisition adds the Maag site and supports the group’s later Zurich West development activities.
- 2003
Acquisition of Frey Group
[1]Swiss Prime Site purchases the Frey Group as part of its expansion in Swiss real estate.
- 2001
Acquisition of Swisscom office portfolio
[1]The company acquires a portfolio of office buildings from Swisscom.
- 2000
Listing on the SIX Swiss Exchange
[1]Swiss Prime Site becomes publicly traded in April, with a real estate portfolio valued at approximately CHF 500 million at the time.
- 1999
Swiss Prime Site is founded
[1]Pension funds associated with Credit Suisse and Siemens Switzerland, together with Winterthur Life, establish the company.
Products and positioning
A large Swiss listed real estate platform combining direct ownership and development of high-quality commercial and mixed-use property with institutional real estate asset management.
Real estate investment · 1999
Commercial real estate portfolio
The company’s core investment activity is the ownership and management of commercial real estate, particularly office buildings, retail properties, and mixed-use assets in major Swiss metropolitan regions. The portfolio is intended to generate recurring rental income while preserving long-term value through active management, repositioning, and development.
Urban development
Prime Tower and Maag site
The Prime Tower and neighboring buildings form a major Swiss Prime Site development at Zurich’s Maag site in Zurich West. The approximately 126-meter tower is an office-led urban landmark, complemented by supporting commercial and hospitality uses including the Clouds restaurant.
Real estate asset management
Swiss Prime Site Solutions
Swiss Prime Site Solutions provides real estate asset-management products and services for external investors. Its activities include tailored investment structures, portfolio management, and support across the property life cycle. The business broadens the group beyond its directly owned assets and serves as a principal growth platform.
Mixed-use development
Sihlcity
Sihlcity is a large mixed-use urban development in Zurich combining retail, services, leisure, and other commercial functions. It is among the prominent completed projects associated with Swiss Prime Site’s development portfolio.
Commercial development
Espace Tourbillon
Espace Tourbillon is a completed commercial development in Geneva and one of the major projects cited in connection with Swiss Prime Site’s real estate development activities.
Brand decisions
2023
Decision to sell Wincasa to ImpleniaM&ABackground
Wincasa had been part of Swiss Prime Site since its acquisition in 2012, but the group later adjusted the composition of its services activities.
Action taken
Swiss Prime Site announced the sale of Wincasa to Implenia.
Aftermath
The announced disposal represented a further simplification of the group’s operating structure while leaving Swiss Prime Site Solutions as a central asset-management platform.
2019
Sale of Tertianum GroupStrategyBackground
After acquiring Tertianum in 2012, Swiss Prime Site announced its sale in 2019 as the group concentrated more closely on real estate investment and related services.
Action taken
The company proceeded with the disposal of Tertianum Group.
Aftermath
The transaction reduced the group’s exposure to senior-living and care operations and sharpened its real estate-focused profile.
Sources2 sources
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