Sec Form 3 Filing - Engel Kevin @ AMKOR TECHNOLOGY, INC. - 2023-02-07

FORM 3 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 Engel Kevin 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) Executive Vice President (Last) (First) (Middle) 2045 EAST INNOVATION CIRCLE 3. Date of Earliest Transaction (MM/DD/YY) 02/07/2023 (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 525 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 Restricted Stock Units $ 0 ( 1 ) ( 1 ) Common Stock 2,451 D Restricted Stock Units $ 0 ( 2 ) ( 2 ) Common Stock 3,761 D Employee Stock Option (Right-to-Buy) $ 9.48 02/15/2020( 3 ) 02/15/2029 Common Stock 6,250 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Engel Kevin 2045 EAST INNOVATION CIRCLE TEMPE, AZ85284 Executive Vice President Signatures Mark N. Rogers, Attorney-in-Fact for Kevin Engel 02/14/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares of time-vested restricted stock units (the "2021 RSUs") granted pursuant to the Amkor Technology, Inc. (the "Issuer") Second Amended and Restated 2007 Equity Incentive Plan, as amended, and the related award agreement on February 11, 2021 (the "2021 RSU Grant Date"). The 2021 RSUs vest in four equal annual installments beginning on the first anniversary of the 2021 RSU Grant Date. ( 2 )Represents shares of time-vested restricted stock units (the "2022 RSUs") granted pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement on February 24, 2022 (the "2022 RSU Grant Date"). The 2022 RSUs vest in four equal annual installments beginning on the first anniversary of the 2022 RSU Grant Date. ( 3 )This stock option (the "Option Shares") to acquire 100,000 shares of the Issuer's common stock was granted on February 15, 2019 (the "Option Grant Date") and vests over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Option Grant Date; (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 Option Grant Date.

Remarks: EXHIBIT LIST: Exhibit 24-Power of Attorney

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