Thorsten Haeser, a German citizen, has been Chief Business Officer at Sunrise since August 2024. In this role, he is responsible for the company's B2B and wholesale business. Before joining Sunrise, he was Chief Commercial Officer at Nets SE/Concardis GmbH from 2019 to 2023 and played a key role in the merger of the two companies and their subsequent successful sale to Nexi AG.

From 1998 to 2010, Thorsten Haeser held various positions at O2 (Telefónica), including General Counsel, Vice President Wholesale & Strategic Partnerships and, most recently, Member of the Management Board Consumer Business. He was also a member of the Executive Board of SIXT AG and Versatel GmbH, and most recently of Hapag-Lloyd AG.  Thorsten Haeser completed his law studies and second state examination at Ludwig Maximilian University.