Orrick, Herrington & Sutcliffe and Pillsbury Winthrop Shaw Pittman confirmed Friday that they are in merger talks that, if successful, would create one of the world’s 20 largest law firms in terms of attorney head count.

“Our firms are in exploratory discussions about a possible combination,” Pillsbury chair James Rishwain and Orrick chair Mitchell Zuklie said in a joint statement issued to The Am Law Daily, a Law Journal affiliate. “These talks are serving to confirm the great respect our firms have for each other.”