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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Stone John Charles 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)
1514 ROCKROSE WAY
3. Date of Earliest Transaction (MM/DD/YYYY)
2/11/2021
(Street)
CHANDLER, AZ 85248
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  2/11/2021    A    6536 (1) A $0.00  31552  D   
Common Stock  2/16/2021    M    9375  A $9.48  40927  D   
Common Stock  2/16/2021    S    9375  D $25.23  31552  D   
Common Stock                 2000  I  Held in Trust 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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  2/16/2021    M        9375   2/15/2020 (2) 2/15/2029  Common Stock  9375  $0.00  75000  D   

Explanation of Responses:
(1)  These are Time-Vested Restricted Stock Units which were granted on February 11, 2021 and vest in four equal annual installments; 25% on each anniversary of the grant date.
(2)  The stock option was granted on February 15, 2019 and vests as follows: 25% of the shares vest on the first anniversary of the grant date and 1/16th of the option vests each quarter thereafter, such that 100% of the option will be vested on the fourth anniversary of the grant date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Stone John Charles
1514 ROCKROSE WAY
CHANDLER, AZ 85248


Executive Vice President

Signatures
Mark N. Rogers, Attorney-in-Fact for John C. Stone 2/18/2021
**Signature of Reporting Person Date