Sec Form 4/A Filing - KIM JAMES J @ AMKOR TECHNOLOGY, INC. - 2021-02-11

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(7) (Last) (First) (Middle) C/O SIANA CARR O'CONNOR & LYNAM,, 1500 EAST LANCASTER AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 02/11/2021 (Street) PAOLI, PA19301-9713 4. If Amendment, Date Original Filed (MM/DD/YY) 02/18/2021 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 02/11/2021 A 10,893( 1 ) A $ 0 1,275,770( 2 ) D Common Stock 23( 6 ) I By spouse Common Stock 49,594,980( 3 )( 6 ) I By self as GP Common Stock 6,417,888( 4 )( 6 ) I By self as trustee of GRATs Common Stock 14,408,075( 5 )( 6 ) I By self as trustee of non-GRATs

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 Exer cisable 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(7) Signatures /s/ Richard D. Rosen, as Attorney-in-Fact 12/29/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As reported on a Form 4 timely filed with the Commission by the reporting person on February 18, 2021 (the "Original Form 4"), 10,893 Time-Vested Restricted Stock Units which vest 25% on each of the first four anniversaries of the grant date were granted to the reporting person on February 11, 2021. ( 2 )The original Form 4 incorrectly included options to purchase 450,000 shares of the Issuer's Common Stock in the reporting person's directly owned stock in Column 5 of Table I. ( 3 )The reporting person is the sole general partner of a limited partnership. The limited partners of the limited partnership are members of his immediate family or entities owned by them. The reporting person has elected to report indirect beneficial ownership of all shares of the Issuer's Common Stock owned by the limited partnership. ( 4 )These shares of the Issuer's Common Stock are held by grantor retained annuity trusts of which the reporting person is the settlor, the sole annuitant and a co-trustee. ( 5 )These shares, which are owned by trusts of which the reporting person is a co-trustee and whose beneficiaries are members of the reporting person's immediate family, were inadvertently omitted from the Original Form 4. The reporting person has elected to report indirect beneficial ownership of all shares of the Issuer's Common Stock owned by these trusts. ( 6 )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 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

Remarks: (7) The reporting person states that the filing of this Amendment to the Original Form 4 shall not be deemed an admission that the reporting person is the beneficial owner of the reported securities owned by the other members of the Group, for the purpose of Section 16 of the Securities Exchange Act of 1934, as amended, 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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