Summary List Placement Paul Singer said there had been some "head-smacking craziness" in markets recently. He singled out "staggering valuation metrics" and "overleveraged capital structures" as worries. Singer's Elliott Management made money every month in 2020, Bloomberg reported. Sign up here for our daily newsletter, 10 Things Before the Opening Bell. Billionaire investor Paul Singer told clients that early 2021 has been a period of "head-smacking craziness" for US stocks and warned there could be "trouble ahead."