X0306 4 2019-03-19 0001166691 COMCAST CORP CMCSA 0001063948 ROBERTS BRIAN L ONE COMCAST CENTER PHILADELPHIA PA 19103 1 1 Chairman of Board, Pres. & CEO Class A Common Stock 2019-03-19 4 M 0 1840000.0000 7.2700 A 4243449.0000 D Class A Common Stock 2019-03-19 4 M 0 450000.0000 7.2700 A 4693449.0000 D Class A Common Stock 2019-03-19 4 S 0 203933.0000 39.8880 D 4489516.0000 D Class A Common Stock 2019-03-19 4 F 0 246067.0000 40.0100 D 4243449.0000 D Class A Common Stock 2019-03-19 4 F 0 1006277.0000 39.9800 D 3237172.0000 D Class A Common Stock 480.0000 I By Daughter Class A Common Stock 13712646.0000 I By LLC Class A Common Stock 286044.0000 I By Spouse Class A Common Stock 8114490.0000 I By Trusts Option to Purchase 7.2700 2019-03-19 4 M 0 450000.0000 7.2700 D 2010-03-27 2019-03-26 Class A Common Stock 450000.0000 1840000.0000 D Option to Purchase 7.2700 2019-03-19 4 M 0 1840000.0000 7.2700 D 2010-03-27 2019-03-26 Class A Common Stock 1840000.0000 0.0000 D Transaction was effected pursuant to a Rule 10b5-1 trading plan. This transaction was executed in multiple trades at prices ranging from $39.84 to $40.04. The price reported above reflects the weighted-average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. With respect to the number of shares set forth in Column 7, this option is immediately exercisable. Arthur R. Block, Attorney-in-fact 2019-03-21