X0202 4 2008-05-15 0 0001166691 COMCAST CORP CMCSA 0001203697 BLOCK ARTHUR R COMCAST CORPORATION ONE COMCAST CENTER PHILADELPHIA PA 19103 0 1 0 0 SVP, GC and Secretary Class A Common Stock 2008-05-15 4 S 0 2000 22.173 D 20436 D Class A Common Stock 2008-05-15 4 S 0 8800 22.17 D 11636 D Class A Common Stock 2008-05-15 4 S 0 2501 22.16 D 9135 D Class A Special Common Stock 2008-05-15 4 M 0 240000 11.2916 A 281133 D Class A Special Common Stock 2008-05-15 4 F 0 164204 21.67 D 116929 D Class A Special Common Stock 2008-05-15 4 S 0 5300 21.91 D 111629 D Class A Special Common Stock 2008-05-15 4 S 0 9670 21.9 D 101959 D Class A Special Common Stock 2008-05-15 4 S 0 11012 21.89 D 90947 D Class A Special Common Stock 2008-05-15 4 S 0 1100 21.88 D 89847 D Class A Special Common Stock 2008-05-15 4 S 0 9061 21.87 D 80786 D Class A Special Common Stock 2008-05-15 4 S 0 39653 21.86 D 41133 D Class A Special Common Stock 4446 I By daughter Class A Special Common Stock 4683 I By son Option to Purchase 11.2916 2008-05-15 4 M 0 240000 0 D 2008-06-15 Class A Special Common Stock 240000 0 D Shares acquired upon exercise of options. Shares delivered for payment of option exercise price and tax liability. This is an option to purchase Class A Special Common Stock. This option is immediately exercisable. /s/ Arthur R. Block 2008-05-19