CASA Casa Systems Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K/A

(AMENDMENT NO. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 15, 2023

Registrant’s Telephone Number, Including Area Code: (978) 688-6706

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

EXPLANATORY NOTE

On June 16, 2023, Casa Systems, Inc. (the “Company”) filed a Current Report on Form 8-K (the “Initial Form 8-K”) to report the closing of a series of transactions related to restructuring of the Company’s credit facility. The Company is filing this Amendment No. 1 to the Current Report on Form 8-K (this “Amendment No. 1”) only to include certain exhibits that were omitted from Item 9.01 of the Initial Form 8-K, which as disclosed in the Initial Form 8-K, were to be filed with this Amendment No. 1. Except as set forth herein, this Amendment No. 1 does not amend, modify or update the disclosure contained in the Initial Form 8-K. This Amendment No. 1 should be read in conjunction with the Initial Form 8-K.