Results of Operations

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): February 22, 2024 Glatfelter Corporation ______________________________________________________________________ (Exact name of registrant as specified in its charter) Pennsylvania 001-03560 23-0628360 (State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 4350 Congress Street ,  Suite 600 ,  Charlotte ,  North Carolina 28209 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: 704   885-2555 (N/A) ______________________________________________________________________ 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: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock GLT New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company in 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. ¨ Item 2.02 Results of Operations and Financial Condition. On February 22, 2024, the Company reported its results of operations for the three months and the year ended December 31, 2023. A copy of the press release issued by the Company is furnished herewith as Exhibit 99.1. Item 9.01 Financial Statements and Exhibits. d) Exhibits. 99.1 Press release issued February 22, 2024. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). The information furnished in this Current Report on Form 8-K and Exhibit 99.1 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Glatfelter Corporation February 22, 2024 By: /s/ David C. Elder Name: David C. Elder Title: Vice President, Strategic Initiatives & Business Optimization & Chief Accounting Officer (Principal accounting officer)