July 24, 2024 Cory Sindelar Chief Financial Officer Calix, Inc. 2777 Orchard Parkway San Jose, California 95134 Re: Calix, Inc. Form 10-K for the Fiscal Year Ended December 31, 2023 Form 8-K filed April 22, 2024 File No. 001-34674 Dear Cory Sindelar: We have completed our review of your filings. We remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, notwithstanding any review, comments, action or absence of action by the staff. Sincerely, Division of Corporation Finance Office of Technology