The family business Maerki Baumann & Co. AG was founded in 1932 by Friedrich Maerki and Georg Braun as the stock exchange bank Maerki, Braun & Co. for which they were granted a license on February 15, 1932. A few months later, Georg Braun died of a heart attack.

The lawyer Conrad Baumann became the new partner of Friedrich Maerki. From now on, the bank was called Maerki, Baumann & Co. After the death of Conrad Baumann in 1947, his widow and co-heiress Lotte Baumann-Heberlein joined the company as director and first wife. She brought in other investors and the capital doubled. About two years later, the bank became a stock corporation and was called Maerki Baumann & Co. AG. In 1970, the Zurich entrepreneur Hans A. Syz succeeded the founder Friedrich Maerki as director and delegate to the board of directors.

Today, Maerki Baumann is in the hands of the second generation of the Syz family, the son Hans G. Syz-Witmer and his sister Carole Schmied-Syz. The two siblings sit on the Board of Directors as Chairman and Vice Chairman respectively. The Executive Board, chaired by Stephan A. Zwahlen, manages the operational business.