Activist investor Carl Icahn may want to consider talking up the shares of Chesapeake Energy, because he’s lost seven times as much money on them Thursday as he’s made on Apple Inc.’s stock.

Icahn Associates is the largest shareholder of Chesapeake Energy US:CHK, with 66,450,000 shares, according to FactSet. With the shares sliding $1.13, or 5.5%, to $19.50 in afternoon trade Thursday to their lowest level since July 1, 2013, Icahn has so far lost $75.1 million on the day.