The AP’s compensation study covered 340 executives at S&P 500 companies who have served at least two full consecutive fiscal years at their respective companies, which filed proxy statements between Jan. 1 and April 30. Some companies with highly paid CEOs do not fit these criteria.

Compensation often includes stock and option grants that the CEO may not receive for years unless certain performance measures are met. For some companies, big raises occur when CEOs get a stock grant in one year as part of a multi-year grant.