X0304 4 2012-02-15 0 0000851310 HARMONIC INC HLIT 0001512682 Carrington Mark 4300 NORTH FIRST ST. SAN JOSE CA 95134 0 1 0 0 Sr. VP of Worldwide Sales Common Stock 2012-02-15 4 A 0 3600 0.00 A 17128 D Common Stock 2012-02-15 4 F 0 1320 6.27 D 15808 D Common Stock 2012-02-15 4 A 0 1750 0.00 A 17558 D Common Stock 2012-02-15 4 F 0 641 6.27 D 16917 D Common Stock 2012-02-15 4 A 0 7500 0.00 A 24417 D Common Stock 2012-02-15 4 F 0 3071 6.27 D 21670 D Restricted Stock Units 0.00 2012-02-15 4 M 0 3600 0.00 D 2011-02-15 2014-02-15 Common Stock 3600 14400 D Restricted Stock Units 0.00 2012-02-15 4 M 0 1750 0.00 D 2011-02-15 2014-02-15 Common Stock 1750 7000 D Restricted Stock Units 0.00 2012-02-15 4 M 0 7500 0.00 D 2012-02-15 2015-02-15 Common Stock 7500 22500 D These shares of common stock were acquired upon the vesting of restricted stock units on 2/15/2012. These restricted stock units were initially granted to Mr. Carrington on 1/4/2010, and were identified on a Form 3 filed by Mr. Carrington on 2/14/2011. Shares of Harmonic Inc. common stock withheld by Harmonic Inc. to satisfy tax withholding obligation upon vesting of restricted stock units. These shares of common stock were acquired upon the vesting of restricted stock units on 2/15/2012. These restricted stock units were initially granted to Mr. Carrington on 2/19/2010, and were identified on a Form 3 filed by Mr. Carrington on 2/14/2011. These shares of common stock were acquired upon the vesting of restricted stock units on 2/15/2012. These restricted stock units were initially granted to Mr. Carrington on 3/4/2011, and were identified on a Form 4 filed by Mr. Carrington on 3/8/2011. Includes 324 shares of common stock acquired in the company's Section 16-b exempt employee stock purchase plan on 1/3/2012. /s/ Laura Donovan By: Attorney-in-Fact Laura Donovan 2012-02-17