Amkor director exercises RSUs for 8,692 shares

Amkor Technology director Guillaume Rutten exercised restricted stock units into common stock as part of his equity compensation.

Rhea-AI Filing Summary

Amkor Technology director Guillaume Rutten exercised restricted stock units into common stock as part of his equity compensation. On June 30, 2026, he acquired 8,692 shares of common stock through the conversion of 8,692 restricted stock units. Following this transaction, he directly owned 511,732 common shares. The restricted stock units came from a 43,459-unit, time-vested grant awarded on February 20, 2025 that vested in five equal quarterly installments through June 30, 2026.

Insights

Equity compensation analyst

Routine RSU vesting and exercise increased the director’s direct share holdings.

Director Guillaume Rutten acquired 8,692 shares of Amkor Technology common stock via the exercise of restricted stock units on June 30, 2026. The transaction used code M, indicating an exercise or conversion of a derivative security rather than an open-market purchase.

The RSUs stem from a grant of 43,459 time-vested units awarded on February 20, 2025, vesting in five equal quarterly installments through June 30, 2026. After the conversion, Rutten held 511,732 common shares directly, showing this as a relatively small, routine compensation-related increase in his equity position.

Insider Trade Summary

8,692 shares exercised/converted

Exercise 2 txns

Insider Rutten Guillaume Marie Jean

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	8,692	$0.00	$0.00
Exercise	Common Stock	8,692	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 511,732 shares (Direct)

Footnotes (1)

1. F1. On February 20, 2025, the Reporting Person was granted 43,459 time-vested restricted stock units ("RSUs") which vested 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% was vested on June 30, 2026.

Key Figures

Shares acquired via RSU exercise: 8,692 shares Shares owned after transaction: 511,732 shares RSU grant size: 43,459 units +3 more

6 metrics

Shares acquired via RSU exercise 8,692 shares Common stock acquired on June 30, 2026 through RSU conversion

Shares owned after transaction 511,732 shares Total direct common stock holdings after June 30, 2026 transaction

RSU grant size 43,459 units Time-vested restricted stock units granted February 20, 2025

Number of vesting installments 5 installments RSU grant vested in five equal quarterly installments through June 30, 2026

Exercise transactions count 1 transaction Derivative exercise/conversion event reported in transaction summary

Exercised derivative shares 8,692 units Restricted stock units converted into common stock

Key Terms

Restricted Stock Units, time-vested restricted stock units, Exercise or conversion of derivative security, transaction code M

4 terms

Restricted Stock Units financial

"The transaction involved 8,692 Restricted Stock Units converting into common stock."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

time-vested restricted stock units financial

"On February 20, 2025, the Reporting Person was granted 43,459 time-vested restricted stock units ("RSUs")."

Exercise or conversion of derivative security financial

"The transaction_code_description states: Exercise or conversion of derivative security."

transaction code M financial

"The filing uses transaction code M for the derivative exercise/conversion."

FAQ

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

What insider transaction did Amkor Technology (AMKR) director Guillaume Rutten report?

Director Guillaume Rutten reported exercising restricted stock units into common stock. On June 30, 2026, he converted 8,692 restricted stock units into 8,692 shares of Amkor Technology common stock as part of his equity compensation, increasing his direct share ownership.

How many Amkor Technology (AMKR) shares does Guillaume Rutten hold after this Form 4?

After the reported transaction, Guillaume Rutten directly owns 511,732 shares of Amkor Technology common stock. This figure reflects his position following the June 30, 2026 exercise and conversion of 8,692 restricted stock units into an equivalent number of common shares.

What was the size and vesting schedule of Guillaume Rutten’s Amkor Technology RSU grant?

Guillaume Rutten received a grant of 43,459 time-vested restricted stock units on February 20, 2025. These RSUs vested in five equal quarterly installments on specified dates through June 30, 2026, at which point the grant was fully vested according to the disclosed schedule.

Was the Amkor Technology (AMKR) insider transaction a market purchase or sale?

The transaction was neither a market purchase nor a sale. It was coded “M,” indicating an exercise or conversion of a derivative security, where 8,692 restricted stock units converted into 8,692 common shares as part of routine equity compensation vesting.

What does a transaction code “M” mean in the Amkor Technology (AMKR) Form 4?

Code “M” on the Form 4 indicates an exercise or conversion of a derivative security. For Amkor Technology, this reflects restricted stock units converting into common shares, rather than an open-market trade, signaling a compensation-related event instead of a discretionary buy or sell.

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

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Accepted by SEC EDGAR 07/02/2026 - 04:35 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^*

Rutten Guillaume Marie Jean

(Last) (First) (Middle)

2045 EAST INNOVATION CIRCLE

(Street)

TEMPE ARIZONA 85284

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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	06/30/2026		M		8,692	A	$0	511,732	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	06/30/2026		M			8,692	(1)	(1)	Common Stock	8,692	$0	0	D

Explanation of Responses:

1. On February 20, 2025, the Reporting Person was granted 43,459 time-vested restricted stock units ("RSUs") which vested 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% was vested on June 30, 2026.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	07/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)