Sec Form 4/A Filing - Fahnemann Thomas @ Glatfelter Corp - 2024-02-24

FORM 4/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Fahnemann Thomas 2. Issuer Name and Ticker or Trading Symbol Glatfelter Corp [ GLT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CEO (Last) (First) (Middle) C/O GLATFELTER CORPORATION, 4350 CONGRESS STREET, SUITE 600 3. Date of Earliest Transaction (MM/DD/YY) 02/24/2024 (Street) CHARLOTTE, NC28209 4. If Amendment, Date Original Filed (MM/DD/YY) 02/27/2024 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, Par Value $.01 02/24/2024 M 80,000 A $ 0 93,000 D Common Stock, Par Value $.01 02/24/2024 F 22,974 ( 1 ) D $ 2.01 ( 2 ) 70,026 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units $ 0 02/24/2024 M 80,000 02/24/2024( 3 ) 02/24/2026 Common Stock, Par Value $.01 80,000 $ 0 160,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Fahnemann Thomas C/O GLATFELTER CORPORATION 4350 CONGRESS STREET, SUITE 600 CHARLOTTE, NC28209 X CEO Signatures /s/ Jill L. Urey, Attorney-in-fact 03/04/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These shares are being withheld to satisfy tax obligations. ( 2 )Because the payout occurred on a Saturday, February 24, 2024, the value of the shares was determined using the closing price of the previous business day Friday, February 23, 2024. ( 3 )This RSU grant vesting on 2/24/2024 is the first one-third vesting of the SET RSU 2/24/2023 Grant. The final one-third vests, and all restrictions lapse, on 2/24/2026.

Remarks: This Form 4 amendment is being filed to report all unvested Restricted Stock Units and Performance Share Awards held by the reporting person that were previously reported as directly owned securities on Table I on Table II as derivative securities. This presentation is consistent with the reporting of unvested Restricted Stock Units on other Form 4s filed by the reporting person. Accordingly, the total amount of securities beneficially owned as reported in Table I, Column 5 now excludes 240,000 shares underlying unvested Restricted Stock Units and 360,000 shares underlying Performance Share Awards that were previously reported on Table I.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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