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Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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Casa Systems, Inc. Important Notice Regarding the Availability of Proxy Materials Stockholders Meeting to be held on May 12, 2022 For Stockholders of record as of March 21, 2022 Have the 12 digit control number located in the shaded box above available when you access the website and follow the instructions. When requesting via the Internet or telephone you will need the 12 digit control number located in the shaded box above. * If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located above) in the subject line. No other requests, instructions OR other inquiries should be included with your e-mail requesting material. Casa Systems, Inc. Meeting Type: Date: Time: Place: Annual Meeting of Stockholders Thursday, May 12, 2022 10:00 AM, Eastern Time Annual Meeting to be held live via the Internet - please visit for more details You must pre-register to attend the meeting online and/or participate at SEE REVERSE FOR FULL AGENDA INTERNET TELEPHONE (866) 648-8133 * E-MAIL To order paper materials, use one of the following methods. For a convenient way to view proxy materials and VOTE go to If you want to receive a paper or e-mail copy of the proxy material, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year's meeting, you must make this request on or before May 02, 2022. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy materials, and to obtain directions to attend the meeting, go to: To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the internet. P.O. BOX 8016, CARY, NC 27512-9903






Casa Systems, Inc. Annual Meeting of Stockholders PROPOSAL 1. Election of Directors 1.01 Susana D'Emic 1.02 Bruce Evans 2. To ratify the appointment of Ernst and Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2022. NOTE: To transact any other business that properly comes before the Annual Meeting (including adjournments and postponements thereof). THE BOARD OF DIRECTORS RECOMMENDS A VOTE: FOR ON PROPOSALS 1 AND 2