Nobody is out to any sort of massive stack yet, but there have been some notables to double up. Daniel Negreanu was among the first and now sits with 55,000. He's joined by Nam Le (69,000), and "Miami" John Cernuto (63,000).
They're not the only ones to have doubled, of course. It's just with an 800-strong field, it takes a while to wend through the tables and count down stacks.