Professional Investors are in the Same Boat as All of Us.

As stocks have plunged, so have the value of chief executives' equity stakes in their own companies. The average year-to-date decline is 49 percent for the corporate stock holdings of CEOs at 175 large U.S. companies, according to new research by compensation consulting firm Steven Hall & Partners.

Topping that list is Buffett, who has seen the value of equity in his company, Berkshire Hathaway, fall by about $13.6 billion, or 22 percent, so far this year, to leave his holdings valued at $48.1 billion. Oracle founder and CEO Larry Ellison has seen his equity stake fall by $6.2 billion, or about 24 percent, to $20.1 billion, according to the research that ran from the start of the year through the close of trading Oct. 29.

Rounding out the top five in that study were Microsoft's Steve Ballmer, whose company equity fell by $5.1 billion to $9.4 billion; Amazon.com's Jeff Bezos, whose equity fell by $3.6 billion to $5.7 billion; and News Corp.'s Rupert Murdoch, with a $4 billion contraction to $3 billion.