[Form 4] Amkor Technology Inc Insider Trading Activity

Rhea-AI Filing Summary

Amkor Technology Inc. (AMKR) – Form 4 filing dated 07/02/2025

President & CEO Guillaume Marie Jean Rutten reported the vesting and conversion of 8,691 restricted stock units (RSUs) into common shares on 06/30/2025 (transaction code “M”). The conversion carried a $0 exercise price, so no cash changed hands. Following the transaction, Rutten’s directly held common-share position increased to 368,007 shares. In addition, he still holds 34,768 unvested RSUs that continue to vest quarterly through 06/30/2026.

The RSUs stem from a grant of 43,459 units awarded on 02/20/2025, vesting in five equal installments (8,691 shares each) on 06/30/2025, 09/30/2025, 12/31/2025, 03/31/2026 and 06/30/2026. There were no open-market purchases or sales and no disposition of shares, so the filing primarily reflects routine equity-compensation vesting rather than a change in the executive’s investment stance.

For investors, the filing signals: (1) ongoing equity-based compensation alignment between the CEO and shareholders; (2) no immediate selling pressure from management; and (3) minimal dilution impact given the small share count relative to Amkor’s ~246 million shares outstanding.

Positive

• CEO increased direct ownership by 8,691 shares, enhancing management-shareholder alignment and indicating confidence through retention of equity awards.

Negative

• None.

Insights

Corporate Governance Analyst

TL;DR: Routine RSU vesting; CEO keeps shares, reinforcing incentive alignment—neutral governance impact.

The Form 4 shows CEO Rutten converting 8,691 RSUs at $0, the first tranche of a 43,459-unit award granted in February 2025. Because there is no concurrent sale, the event strengthens insider ownership, now 368,007 shares. Such retention aligns managerial incentives with long-term shareholder value but is standard practice for S&P 400 semiconductor outsourcers like Amkor. Governance risk remains unchanged, and no red flags arise under Section 16 compliance.

Portfolio Manager

TL;DR: Neutral trading signal—small, non-cash share increase; no buy/sell indication for AMKR.

From a portfolio standpoint, the 8,691-share addition equates to roughly 0.004 % of shares outstanding, immaterial to float and earnings per share. Absence of selling suggests the CEO is not signaling concern about valuation, but the passive nature of the award means no actionable momentum cue. Liquidity, capital allocation, and end-market demand for OSAT services remain the dominant investment drivers; this filing does not change the thesis.

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^*

Rutten Guillaume Marie Jean

(Last) (First) (Middle)

2045 EAST 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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

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	368,007	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	(1)	(1)	Common Stock	8,691	$0	34,768	D

Explanation of Responses:

1. On February 20, 2025, the Reporting Person was granted 43,459 restricted stock units 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 Guillaume Marie Jean Rutten	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

How many AMKR shares did CEO Guillaume Rutten acquire on 06/30/2025?

He acquired 8,691 common shares through RSU conversion.

What is the CEO's total beneficial AMKR ownership after the Form 4 transaction?

Rutten now directly owns 368,007 common shares plus 34,768 unvested RSUs.

Was cash paid for the shares reported in the Form 4?

No. The RSUs converted at a $0 exercise price; no cash outlay occurred.

Are there remaining RSUs from the February 2025 grant?

Yes. 34,768 RSUs remain and will vest quarterly through 06/30/2026.

Does the filing indicate any insider selling pressure at Amkor Technology?

No. The Form 4 reflects vesting, not a sale; the CEO retained all converted shares.