United States securities and exchange commission logo July 8, 2022 Edward Durkin Chief Financial Officer Casa Systems, Inc. 100 Old River Road Andover, Massachusetts 01810 Re: Casa Systems, Inc. Form 10-K for the year ended December 31, 2021 Form 8-K furnished April 18, 2022 Response dated June 7, 2022 File No. 1-38324 Dear Mr. Durkin: We have completed our review of your filing. 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 Manufacturing