By late October, AT&T struck a truce with Elliott and unveiled a three-year plan that included selling up to $10 billion worth of businesses, paying off debt and adding two new board members.
Elliott said Friday it supports Stankey's appointment to CEO.
"We have been engaged with the company throughout the search process, which was a robust one, including a range of highly qualified outside candidates and overseen by independent directors," said Jesse Cohen, a partner at Elliott Management. "We look forward to working with John as he begins his term as CEO."