[Form 4] Amkor Technology Inc Insider Trading Activity

Rhea-AI Filing Summary

Form 4 highlights: Amkor Technology’s Chief Financial Officer, Megan Faust, reported routine equity transactions dated 06/30/2025 related to previously granted Restricted Stock Units (RSUs) under the company’s 2021 Equity Incentive Plan.

• Vesting event: 8,691 RSUs vested and were automatically converted into an equal number of common shares (Transaction Code M). The vest carries a stated value of $0 in the filing because RSUs convert without cash consideration.
• Tax-withholding sale: To cover associated tax obligations, 3,725 shares were withheld by Amkor (Transaction Code F) at an indicated price of $20.99 per share.
• Net share change: After the two entries, Faust’s direct ownership decreased from 90,829 to 87,104 shares, a net reduction of 3,725 shares (the amount withheld for taxes). No open-market sale or purchase was executed by the insider.
• Remaining unvested RSUs: 34,768 units continue to vest in equal quarterly tranches on 09/30/2025, 12/31/2025, 03/31/2026, and 06/30/2026, completing the five-installment schedule.

Investor take-away: The filing reflects scheduled equity compensation activity rather than discretionary trading. Because the CFO retained the majority of vested shares and disposals were solely for statutory tax purposes, the transaction is generally viewed as neutral in terms of insider sentiment and should have limited impact on near-term share-price performance.

Insights

Corporate Governance Expert

TL;DR Routine RSU vesting; tax-withholding disposal only; neutral governance signal.

The Form 4 shows compliance with Section 16 reporting requirements and standard tax-withholding mechanics. Code M indicates automatic RSU conversion, while Code F denotes share forfeiture to satisfy payroll tax. No discretionary sale was executed, suggesting the CFO is not reducing her economic exposure. Ownership remains sizable at 87,104 shares, aligning management’s incentives with shareholders. Governance risk is unchanged.

Portfolio Manager

TL;DR Insider activity immaterial to thesis; maintain neutral stance on AMKR.

The 3,725-share disposal equals roughly 0.002% of Amkor’s 247 million outstanding shares—far below any materiality threshold. Withholding price of $20.99 is administrative, not a market sale. Remaining 34,768 RSUs will drip into float over the next year but represent negligible dilution (<0.02%). From a portfolio perspective, the transaction does not warrant position changes or valuation adjustments.

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
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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^*

Faust Megan

(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)
	CFO

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2025

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
Common Stock	06/30/2025		M		8,691	A	$0	90,829	D
Common Stock	06/30/2025		F(1)		3,725	D	$20.99	87,104	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 (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	06/30/2025		M			8,691	(2)	(2)	Common Stock	8,691	$0	34,768	D

Explanation of Responses:

1. The transaction represents shares withheld by Amkor Technology, Inc. (the "Issuer") in connection with the vesting of certain restricted stock units ("RSUs") granted to the Reporting Person on February 20, 2025 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.

2. On the Grant Date, the Reporting Person was granted 43,459 RSUs which vest in five equal quarterly installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31, 2026, and June 30, 2026, such that 100% will be vested on June 30, 2026.

Remarks:

	Mark N. Rogers, Attorney-in-Fact for Megan Faust	07/02/2025
	** 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.

FAQ

What triggered the Form 4 filing for AMKR?

The CFO’s 8,691 RSUs vested on 06/30/2025, converting to common shares and requiring Section 16 disclosure.

Did the CFO of Amkor Technology sell shares on the open market?

No. The 3,725 shares shown as Code F were withheld by the company solely for tax withholding purposes.

How many AMKR shares does Megan Faust now own directly?

After the reported transactions, she owns 87,104 common shares.

What RSU balance remains unvested for the CFO?

34,768 RSUs will vest in four equal quarterly tranches through 06/30/2026.

Is the transaction likely to impact Amkor’s share price?

Impact is expected to be minimal; the activity is routine compensation-related, not an open-market sale.

At what price were shares withheld for taxes?

Shares were valued at $20.99 each for payroll tax withholding purposes.