Press Release

Harmonic Announces First Quarter 2013 Reporting Date

April 15, 2013

SAN JOSE, Calif. - April 15, 2013 - Harmonic Inc. (NASDAQ: HLIT) today announced that it plans to report its results for the first quarter 2013, after market close on April 23, 2013.

Harmonic will host a conference call to discuss its financial results at 2:00 p.m. Pacific (5:00 p.m. Eastern) on Tuesday, April 23, 2013. A listen-only broadcast of the conference call can be accessed either from the Company's website at www.harmonicinc.com or by calling +1.847. 944.7317 or +1.866.297.6395 (conference confirmation number 34677064). The replay will be available after 6:00 p.m. Pacific at the same website address or by calling +1.630.652.3042 or +1.888.843.7419 (pass code 34677064#).

Harmonic intends to discuss financial and other statistical information on this conference call. This information will also be available on the Company's website at www.harmonicinc.com either in the press release related to the above broadcast, by accessing the listen-only broadcast described above or by accessing the replay of the broadcast described above.

About Harmonic Inc.

Harmonic (NASDAQ: HLIT) is the worldwide leader in video delivery infrastructure for emerging television and video services. The company's production-ready innovation enables content and service providers to efficiently create, prepare, and deliver differentiated services for television and new media video platforms. More information is available at www.harmonicinc.com

CONTACTS:

Carolyn V. Aver   Michael Bishop
Chief Financial Officer   Investor Relations
Harmonic Inc.   +1.408.542.2760
+1.408.542.2500

HUG#1692905