Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them to Schedule 13G (including additional amendments thereto) with respect to the Common Stock, par value $0.001 per share, of Harmonic Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement. The undersigned acknowledge that each shall be responsible for the timely filing of any amendments to such joint filing and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others.

Dated: February 16, 2021

SCOPIA CAPITAL MANAGEMENT LP

By: /s/ Samantha Nasello

Name:  Samantha Nasello

Title:  CCO

SCOPIA MANAGEMENT, INC.

By: /s/ Aaron Morse

Name:  Aaron Morse

Title:  Vice President

By: /s/ Matthew Sirovich

Name:  Matthew Sirovich

By: /s/ Jeremy Mindich

Name:  Jeremy Mindich