Amkor CAO granted 799 restricted stock units

Buntyn Cherie reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Buntyn Cherie reported acquisition or exercise transactions in this Form 4 filing.

Amkor Technology reported that Chief Accounting Officer Cherie Buntyn received a grant of 799 restricted stock units of Amkor common stock. These RSUs were awarded for no cash consideration as part of her compensation for serving as an officer.

The 799 RSUs will vest in three equal annual installments, beginning on the first anniversary of the March 12, 2026 grant date, with all units fully vested on the third anniversary. Following this grant, Buntyn holds 799 RSUs directly.

Insider Trade Summary

Grant/Award: 799 shares

Grant/Award 1 txn

Insider Buntyn Cherie

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	799	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 799 contracts (Direct)

Footnotes (1)

1. F1. Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "RSUs") granted on March 12, 2026 (the "Grant Date") pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the Grant Date.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Amkor Technology (AMKR) report for Cherie Buntyn?

Amkor Technology reported that Chief Accounting Officer Cherie Buntyn received a grant of 799 restricted stock units. These RSUs represent Amkor common stock awarded as part of her officer compensation, not an open-market stock purchase or sale.

How many restricted stock units were granted to the Amkor (AMKR) Chief Accounting Officer?

Cherie Buntyn was granted 799 restricted stock units tied to Amkor common stock. This entire amount reflects a new equity award and equals her total RSU holdings reported following the transaction in the Form 4 filing.

When do Cherie Buntyn’s Amkor (AMKR) RSUs vest?

The 799 RSUs granted to Cherie Buntyn vest in three equal annual installments. Vesting begins on the first anniversary of the March 12, 2026 grant date and will be 100% complete on the third anniversary, subject to continued officer service.

Did Cherie Buntyn pay cash for the Amkor (AMKR) restricted stock units?

No, the RSUs were awarded for no consideration other than Cherie Buntyn’s service as an officer. This means the 799 restricted stock units are a form of equity compensation rather than shares she bought in the market.

Are Cherie Buntyn’s Amkor (AMKR) RSUs subject to time-based vesting?

Yes, the 799 restricted stock units are time-vested awards. They vest in three equal annual tranches starting one year after March 12, 2026, with all units fully vested by the third anniversary of the grant date, assuming ongoing service.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/16/2026 - 06:37 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Buntyn Cherie

(Last) (First) (Middle)

2045 E INNOVATION CIRCLE

(Street)

TEMPE AZ 85284

(City) (State) (Zip)

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)
	Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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: 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	03/12/2026		A		799		(1)	(1)	Common Stock	799	$0	799	D

Explanation of Responses:

1. Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "RSUs") granted on March 12, 2026 (the "Grant Date") pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the Grant Date.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Cherie Buntyn	03/16/2026
	** Signature of Reporting Person	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).
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.