X0202 4 2007-04-10 0 0001166691 COMCAST CORP CMCSA 0001084606 ALCHIN JOHN R COMCAST CORPORATION 1500 MARKET STREET PHILADELPHIA PA 19102 0 1 0 0 EVP, Treasurer & Co-CFO Class A Common Stock 2007-04-10 4 M 0 18360 0 A 52536.0854 D Class A Common Stock 2007-04-10 4 F 0 6759 26.7100 D 45777.0854 D Restricted Stock Units 2007-04-10 4 M 0 18360 0 D 2007-04-10 Class A Common Stock 18360.0000 104040.0000 D Shares acquired on the vesting of restricted stock units. Shares withheld for payment of tax liability. Each restricted stock unit represents a contigent right to receive one share of Class A Common Stock. The restricted stock units vest in installments of 15%, 15%, 15%, 15% and 40% on the 13th-month, 2nd, 3rd, 4th and 5th anniversaries of the date of grant (March 10, 2006), respectively. By: Arthur R. Block, Attorney-in-fact for John R. Alchin 2007-04-11