Amounts were checked, when possible, with company officials and the officers and directors involved. Amounts include sales by corporations entirely or largely controlled by the sellers, such as Phil Anschutz’s Anschutz Co., Jay Walker’s Walker Digital, and John Moores’ JMI, as well as trusts and stock sales by immediate family. Not included are sales and transfers of stock, sometimes linked to exotic derivatives, that are not recorded as sales by the SEC. The totals here include all sales reported to the SEC, reporting which usually (but not in every case) continues until an officer or a director leaves the company.