Sec Form 4/A Filing - KIM JAMES J @ AMKOR TECHNOLOGY, INC. - 2021-12-27

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 KIM JAMES J 2. Issuer Name and Ticker or Trading Symbol AMKOR TECHNOLOGY, INC. [ AMKR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) X __ Other (specify below) Member of 10% owner group (Last) (First) (Middle) C/O SIANA CARR O'CONNOR & LYNAM,, 1500 EAST LANCASTER AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 12/27/2021 (Street) PAOLI, PA19301-9713 4. If Amendment, Date Original Filed (MM/DD/YY) 01/27/2022 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 12/27/2021 G V 164,678( 1 )( 2 ) A $ 0 12,678,815( 3 ) I By trusts (excl. own GRATs & Susan Y. Kim 2018-1 Qualified Annuity Trust dtd. 8/29/18)

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other KIM JAMES J C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE PAOLI, PA19301-9713 X X Member of 10% owner group Signatures /s/ Richard D. Rosen, Attorney-in-Fact 04/20/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On January 27, 2022, the Reporting Person filed a Form 4 (the "Original Form 4") which inadvertently omitted a transaction which resulted in an increase in the indirect holdings of the Reported Person as the trustee of a trust for the benefit of members of the Reporting Person's immediate family. On December 27, 2021, a transfer of 164,678 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") was made to a limited liability company being treated as a corporation for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"). The Reporting Person is a trustee of a trust which is a member of such limited liability company. The beneficiaries of the trust are members of the Reporting Person's immediate family. The trust is being treated as the "controlling shareholder" of the limited liability company for purposes of Section 16. ( 2 )(Continued from Footnote 1) Although the above described transfer of shares of the Issuer's Common Stock was not reported on the Original Form 4, such shares were correctly included in the indirect holdings of the Reporting Person on the Original Form 4 ( 3 )The Reporting Person is a trustee of trusts for the benefit of his immediate family members (excluding his own grantor retained annuity trusts and the Qualified Annuity Trust Under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd 8/29/18) which own 12,678,815 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16, or for any other purpose.

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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