Treichl worked at several branches of
Chase Manhattan Bank in a number of European and American cities from 1977 to 1983. From 1983 to 1986, he was a member of the senior management at Erste Bank der oesterreichischen Sparkassen AG. From 1986 to 1993, he was chairman of Chase Manhattan Bank Austria, and from 1993 to 1994, chairman of
Crédit Lyonnais Austria. In 1997, Treichl became Chairman of the Board of
Erste Bank, and since 2008, he has been Chief Executive Officer of
Erste Group Bank AG. The largest shareholder of Erste Group is ERSTE Stiftung of which Treichl has been chairman since the end of 2012. ERSTE Stiftung is one of the largest non-profit organisations in Europe. Its activities focus on the region of Central and Eastern Europe, which is Erste Group’s home market, and include programmes for social integration, culture and Europe. Moreover, Andreas Treichl initiated the project “
Die Zweite Sparkasse” and played a key role in its implementation. In addition to his career in banking, Treichl was finance director of the federal organization of the Austrian People's Party (Österreichische Volkspartei,
ÖVP) from 1991 to 1997. In June 2010, he was an invited guest at the 58th Bilderberg Conference in
Sitges. ==Other activities==