Elliott has acquired a roughly $2 billion stake in Southwest Airlines, the WSJ reported.

(Reuters) – Activist investor Elliott Investment Management has taken a roughly $2 billion stake in Southwest Airlines (NYSE:) and plans to push for changes to turn around the airline’s poor performance, according to the Wall Street Journal (WSJ). This was reported on Sunday, citing sources familiar with the matter. .

Elliott is one of Southwest’s largest investors and plans to work with the airline’s management, the report said.

Southwest and Elliott did not immediately respond to Reuters’ request for comment.

The Dallas-based airline said in April that it expected higher costs and slower-than-expected revenue growth from U.S. plane maker Boeing (NYSE:) after it could deliver only 20 aircraft this year.

One of the world’s most famous investors, Elliott is known for driving corporate change to increase shareholder returns.