SoftBank Group Corp. Chief Operating Officer Marcelo Claure is making preparations to depart the Japanese conglomerate after clashing with founder Masayoshi Son over his compensation and responsibilities, people familiar with the matter said.

The 51-year-old Bolivian American agreed to sell a majority stake in his cellphone distributor to SoftBank in 2013, becoming one of Son’s top lieutenants and a billionaire in the process. Still, Claure, who was SoftBank’s second-highest paid executive in the latest financial year, has often pushed for much more money and authority.

In recent months, he has pressed for as much as ¥115 billion ($1 billion) in compensation because of his contributions, including the turnaround and sale of Sprint Corp. and the listing of troubled WeWork. He also advocated for a spinoff of the Latin American investment fund he oversees for SoftBank, it was reported last year.