Following weeks of rumors of serious conflicts with the board over strategy, Atos announced on Tuesday that Chief Executive Rodolphe Belmer, who started his role only in January, will resign.
With locations all over the world and a headquarters in Bezons, France, Atos is a global French information technology service and consulting firm.
It specializes in big data, cloud, cybersecurity, unified communications, and high-tech transactional services.
Atos will sell non-strategic assets worth about 700 million euros, chief executive Christophe Belmer said on Tuesday.
The news came just an hour before a much-anticipated capital market day.
Atos said it had appointed two deputy CEOs, Nourdine Bihmane and Philippe Oliva.
The company said it was looking at splitting into two publicly listed entities.