Sec Form 4 Filing - Faust Megan @ AMKOR TECHNOLOGY, INC. - 2022-06-09

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 Faust Megan 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 X __ Officer (give title below) _____ Other (specify below) CFO (Last) (First) (Middle) 2045 E INNOVATION CIRCLE 3. Date of Earliest Transaction (MM/DD/YY) 06/09/2022 (Street) TEMPE, AZ85284 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 06/09/2022 M 6,000 A $ 9.48 14,512( 1 )( 2 ) D Common Stock 06/09/2022 S( 3 ) 6,000 D $ 19.9( 4 ) 8,512 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 Employee Stock Option (Right-to-Buy) $ 9.48 06/09/2022 M 6,000 02/15/2020( 5 ) 02/15/2029 Common Stock 6,000 $ 0 118,500 D Restricted Stock Units ( 1 ) ( 1 ) ( 1 ) Common Stock ( 1 ) 13,972( 1 ) D Restricted Stock Units ( 2 ) ( 2 ) ( 2 ) Common Stock ( 2 ) 5,718( 2 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Faust Megan 2045 E INNOVATION CIRCLE TEMPE, AZ85284 CFO Signatures Mark N. Rogers, Attorney-in-Fact for Megan Faust 06/13/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As previously reported in a Form 4 filed by the Reporting Person on February 25, 2022 (the "Original 2022 Form 4"), shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "2022 RSUs") were granted to the Reporting Person on February 24, 2022. In the Original 2022 Form 4, the 2022 RSUs were incorrectly reported inTable I. Table II, Column 9 of this Form 4 has been adjusted to include the 2022 RSUs and reflects the proper number of 2022 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4. ( 2 )As previously reported in a Form 4 filed by the Reporting Person on February 18, 2021 (the "Original 2021 Form 4"), shares of the Issuer's common stock underlying time-vested restricted stock units (the "2021 RSUs") were granted to the Reporting Person on February 11, 2021. In the Original 2021 Form 4 and in subsequent Form 4s filed by the Reporting Person, the 2021 RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the 2021 RSUs and reflects the proper number of 2021 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4. ( 3 )The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 10, 2022. ( 4 )The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $19.80 to $20.04.The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (4) to this Form 4. ( 5 )This stock option (the "Option") to acquire 150,000 shares of the Issuer's common stock (the "Option Shares") was granted on February 15, 2019 (the "Grant Date") and vests over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option will vest on the fourth anniversary of the Grant Date.

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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