[3] He was for many years the wealthiest person in Finland[4] and directly or indirectly controlled 23.29% of the Sanoma Corporation's shares,[5] whose value on 29 July 2009 was more than €453 million.
[4] His father was the politician and journalist Eljas Erkko, who preceded him as editor in chief of Helsingin Sanomat, and his mother was the English-born Eugenia Violet Sutcliffe.
[3] Sanoma made its initial public offering in 1999, during Aatos Erkko's time as chairman of the board.
As one of the key parts of Sanoma, Helsingin Sanomat is the largest newspaper by circulation in the entire Nordic region.
[10] He also donated expensive equipment to the Helsinki University Central Hospital and gave significant financial support to the Nuuksio National Park.