Sec Form 4 Filing - KIM SUSAN Y @ AMKOR TECHNOLOGY, INC. - 2022-06-23

FORM 4 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 SUSAN Y 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 (6) (Last) (First) (Middle) C/O SIANA CARR O'CONNOR & LYNAM,, 1500 EAST LANCASTER AVENUE, 3. Date of Earliest Transaction (MM/DD/YY) 06/23/2022 (Street) PAOLI, PA19301-9713 4. If Amendment, Date Original Filed (MM/DD/YY) 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 5,375,484( 1 ) D Common Stock 06/23/2022 G V 274,900( 2 ) D $ 0 753,232( 3 )( 4 ) I By John T. Kim GRAT dtd 2/6/18 Common Stock 3,328,065( 3 )( 4 ) I By Agnes C. Kim GRAT dtd 12/16/20 Common Stock 1,401,123( 3 )( 4 ) I By James J. Kim GRAT dtd 4/1/20 Common Stock 2,675,911( 3 )( 4 ) I By James J. Kim GRAT dtd 9/10/19 Common Stock 2,353,347( 3 )( 4 ) I By James J. Kim GRAT dtd 12/15/21 Common Stock 4,224,548( 3 )( 4 ) I By Susan Y. Kim GRATs Common Stock 9,181,498( 3 )( 4 ) I By trusts (excl. GRATs) Common Stock 19,484,809( 3 )( 4 ) I By Sujochil, LP Common Stock 2,478,325( 3 )( 4 ) I By Sujoda Investments, LP Common Stock 8,200,000( 3 )( 4 ) I By LLCs treated as Corporations

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 ( 1 ) ( 1 ) ( 1 ) Common Stock ( 1 ) 8,706( 1 ) D Restricted Stock Units ( 5 ) 06/27/2022 A 24.5516( 5 ) ( 5 ) ( 5 ) Common Stock 24.5516( 5 ) $ 0 8,730.5516( 1 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other KIM SUSAN Y C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI, PA19301-9713 X X Member of 10% owner group (6) Signatures Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim 06/29/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As previously reported in a Form 4 filed by the Reporting Person on May 19, 2022 (the "Original Form 4"), 8,706 shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "RSUs") were granted to the Reporting Person on May 17, 2022. Pursuant to the award agreement for the RSUs, dividend equivalent units ("DEUs") accrue with respect to the RSUs when and as dividends are paid on the Issuer's common stock. In the Original Form 4, the RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the RSUs and reflects the proper number of RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4. ( 2 )On June 23, 2022, the John T. Kim 2018 Irrevocable Trust dated February 6, 2018 distributed 274,900 shares of the Issuer's common stock to John T. Kim. The Reporting Person is a trustee of the trust. John T. Kim and the Reporting Person are brother and sister. ( 3 )The Reporting Person is (i) a trustee of trusts for the benefit of her immediate family members (other than grantor retained annuity trusts ("GRATS")) which own 9,181,498 shares of the Issuer's common stock, (ii) a trustee of GRATS created by members of her immediate family which own 10,511,678 shares of the Issuer's common stock, (iii) a trustee of GRATS of which she was the settlor and is the sole annuitant which own 4,224,548 shares of the Issuer's common stock, (iv) a general partner of a limited partnership which owns 19,484,809 shares of the Issuer's common stock, (v) a manager of limited liability companies ("LLCs") being treated as corporations for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), which own 8,200,000 shares of the Issuer's common stock, and (vi) a manager of an LLC being treated as a limited partnership for purposes of Section 16 which owns 2,478,325 shares of the Issuer's common stock. ( 4 )Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of these 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. ( 5 )Represents DEUs accrued with respect to the RSUs upon the Issuer's payment of a dividend on June 27, 2 022. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.

Remarks: (6) The Reporting Person states that the filing of this 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 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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