Billionaire Paul Singer's Elliott Management has taken a 'sizable stake' and intends to 'push for changes', reports Bloomberg News A major Republican donor has purchased a stake in Twitter and is reportedly seeking to oust its chief executive, Jack Dorsey. Bloomberg News first reported that Elliott Management has taken a "sizable stake" and "and plans to push for changes at the social media company, including replacing Dorsey". Paul Singer, the billionaire founder of Elliott Management, is a Republican mega-donor who opposed Donald Trump during the real-estate magnate's run for the presidential nomination but has since come onside.