X0306 4 2019-02-12 0001166691 COMCAST CORP CMCSA 0001203695 COHEN DAVID L ONE COMCAST CENTER PHILADELPHIA PA 19103 1 Sr. EVP Class A Common Stock 2019-02-12 4 M 0 360000.0000 7.2700 A 650655.9846 D Class A Common Stock 2019-02-12 4 S 0 163581.0000 37.1170 D 487074.9846 D Class A Common Stock 2019-02-12 4 F 0 196419.0000 37.2300 D 290655.9846 D Class A Common Stock 2019-02-12 4 S 0 40541.0000 37.1860 D 1050157.0000 I By Trusts Class A Common Stock 2019-02-12 4 S 0 54815.0000 37.2050 D 995342.0000 I By Trusts Class A Common Stock 58490.0000 I By GRATs Class A Common Stock 80.0000 I By Spouse Option to Purchase 7.2700 2019-02-12 4 M 0 360000.0000 0.0000 D 2010-03-27 2019-03-26 Class A Common Stock 360000.0000 360000.0000 D This transaction was executed in multiple trades at prices ranging from $37.05 to $37.22. 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. This transaction was executed in multiple trades at prices ranging from $37.18 to $37.22. 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. This transaction was executed in multiple trades at prices ranging from $37.20 to $37.24. 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 2019-02-14