Tietoevry Oyj, Tietoevry Corporation, (Tieto prior to Jun 2019) is a Finnish IT software and service company providing IT and product engineering services. Tietoevry is domiciled in Espoo, Finland, and the company's shares are listed on the NASDAQ OMX Helsinki, NASDAQ OMX Stockholm and Oslo Stock Exchange. Tietoevry has approximately 24,000 employees across 20 countries, and has customers in the energy, forestry, banking, and healthcare sectors. History Tietotehdas, TT Tieto and Tieto in Finland (1968–1999) Tieto started its business operations in Espoo, Finland in 1968 under the name Tietotehdas Oy. During the company's first years, it developed and maintained IT systems mainly for the Union Bank of Finland (Suomen Yhdyspankki, today Nordea) and its customers, as well as a few forestry companies. The customer base of the company grew during the 1970s, when mini-computers were introduced alongside the existing mainframe computers. Besides mainframe computer services and software, the development of IT systems was also central to the operations of Tietotehdas. Customers represented several industries and operations were organized according to these verticals. During the 1990s, the company experienced rapid growth through a number of acquisitions, mergers and strategic alliances. In December 1995, Tietotehdas acquired the Finnish state computer centre (VTKK-Yhtymä Oy). The new company was named TT Tieto Oy. In 1996, the company strengthened its exposure in the telecom sector considerably through the acquisition of Avancer. The company's name was changed to Tieto Corporation Oyj in 1998. Enator in Sweden, Denmark, Norway and Finland (1977–1999) Enator corporation started in 1977 as a consultant firm created to support the Pronator company with software and project management. In 1989, Enator AB acquired the Norwegian IT consulting company ISI AS. In 1990, Enator merged with Modulföretagen and adopted its logo. Enator grew to approximately 650 consultants in Sweden, Denmark, Norway and Finland. In 1993 it was included in the AxData group as a stand-alone company but was sold to Celsius in 1995. The subsidiary's name, Enator, was applied to the whole group in 1995, when Celsius AB, a publicly traded Swedish company, merged the IT operations it had acquired between 1991 and 1994. In spring 1996, the corporation was listed on the Stockholm Stock Exchange under the name of Enator. Until 1994, there were IT operations in three separate subsidiaries: Telub, Enator and Dialog. The merger of the three subsidiaries led to a restructuring program in 1997. During 1998, Enator conducted a series