X0303 4 2010-05-06 0 0001227930 ENTROPIC COMMUNICATIONS INC ENTR 0001416939 Lyle David 6290 SEQUENCE DRIVE SAN DIEGO CA 92121 0 1 0 0 Chief Financial Officer Common Stock 2010-05-06 4 M 0 6300 0.4284 A 41747 D Common Stock 2010-05-06 4 S 0 6300 4.6313 D 35447 D Incentive Stock Option (right to buy) 0.4284 2010-05-06 4 M 0 6300 0 D 2015-08-19 Common Stock 6300 184287 D The sales reported in the Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 28, 2009. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.50 to $4.79, per share. The reporting person undertakes to provide to Entropic Communications (the "Company"), any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. 1/4th of the shares vest one year after the Vesting Commencement Date beginning 8/19/05. 1/48th of the shares vest monthly thereafter over the next three years. The options may be early exercised prior to vesting but any exercised and unvested shares are subject to a right of repurchase on behalf of the Issuer. Lance W. Bridges, as attorney-in-fact for David B. Lyle 2010-05-07