Sec Form 5 Filing - KIM AGNES C @ AMKOR TECHNOLOGY, INC. - 2020-12-31

FORM 5 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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person KIM AGNES C 2. Issuer Name and Ticker or Trading Symbol AMKOR TECHNOLOGY, INC. [ AMKR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) X __ Other (specify below) Exhibit 99.1 (Last) (First) (Middle) C/O SIANA CARR O'CONNOR & LYNAM,, 1500 EAST LANCASTER AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2020 (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 12/17/2020 S 816,613 A $ 15.41 23 ( 1 ) D Common Stock 12/17/2020 S 816,613 A $ 15.41 23 ( 2 ) D Common Stock 12/17/2020 S 816,613 A $ 15.41 23 ( 3 ) D Common Stock 12/17/2020 S 1,633,226 A $ 15.41 23 ( 4 ) D Common Stock 12/21/2020 G V 4,083,065 D $ 15.01 23 ( 5 ) 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other KIM AGNES C C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE PAOLI, PA19301-9713 Exhibit 99.1 Signatures /s/ Mark N. Rogers, as Attorney in Fact 02/12/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On December 17, 2020, the James J. Kim 2008 Trust FBO Alexandra Kim Panichello & Descendants dated 2/5/08 sold 816,613 shares of Issuer's Common Stock to Agnes C. Kim in full payment of the principal and accrued interest of a Note payable to her by such trust. Susan Y. Kim and John T. Kim are co-trustees of the trust. This transaction was reported on a Form 4 for the trust on December 20, 2020, but was not separately reported for the reporting person. ( 2 )On December 17, 2020, the James J. Kim 2008 Trust FBO Jacqueline Mary Panichello & Descendants dated 2/5/08 sold 816,613 shares of Issuer's Common Stock to Agnes C. Kim in full payment of the principal and accrued interest of a Note payable to her by such trust. Susan Y. Kim and John T. Kim are co-trustees of the trust. This transaction was reported on a Form 4 for the trust on December 20, 2020, but was not separately reported for the reporting person. ( 3 )On December 17, 2020, the James J. Kim 2008 Trust FBO Dylan James Panichello & Descendants dated 2/5/08 sold 816,613 shares of Issuer's Common Stock to Agnes C. Kim in full payment of the principal and accrued interest of a Note payable to her by such trust. Susan Y. Kim and John T. Kim are co-trustees of the trust. This transaction was reported on a Form 4 for the trust on December 20, 2020, but was not separately reported for the reporting person. ( 4 )On December 17, 2020, the James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08 sold 1,633,226 shares of Issuer's Common Stock to Agnes C. Kim in full payment of the principal and accrued interest of a Note payable to her by such trust. Susan Y. Kim and John T. Kim are co-trustees of the trust. This transaction was reported on a Form 4 for the trust on December 20, 2020, but was not separately reported for the reporting person. ( 5 )On December 21, 2020, the reporting person transferred 4,083,065 shares of the Issuer's Common Stock to the Agnes C. Kim 2020-1 Qualified Annuity Trust U/A Dated 12/16/20 as a gift. Susan Y. Kim is the sole trustee of the trust. This transaction was previously reported on Form 3 for the trust and Form 4 for Susan Y. Kim. 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.

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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.