Amkor director granted RSUs, exercises 8,692 units

AMKOR TECHNOLOGY, INC. director Guillaume Marie Jean Rutten reported equity compensation activity, including a new grant of 482 restricted stock units and the vesting of 8,692 restricted stock units into common shares.

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director Guillaume Marie Jean Rutten reported equity compensation activity, including a new grant of 482 restricted stock units and the vesting of 8,692 restricted stock units into common shares. These transactions are awards and exercises, not open-market buying or selling.

Following the conversion of 8,692 restricted stock units into common stock, Rutten directly holds 552,558 shares of Amkor common stock. The restricted stock units were granted under Amkor’s 2021 Equity Incentive Plan as compensation for board service and will vest based on specified dates and service conditions.

Insider Trade Summary

8,692 shares exercised/converted

Exercise 3 txns

Insider Rutten Guillaume Marie Jean

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	482	$0.00	$0.00
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 — 9,174 contracts (Direct); Common Stock — 552,558 shares (Direct)

Footnotes (2)

1. F1. On February 20, 2025, the Reporting Person was granted 43,459 time-vested restricted stock units ("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.
2. F2. Represents shares of common stock underlying RSUs (the "Director RSUs") granted on April 1, 2025 (the "Grant Date") pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended. Subject to the terms and conditions of the applicable award agreement, the Director RSUs may be converted into common stock of the Issuer on a one-for-one basis and will vest in full on the earlier of the first anniversary of the Grant Date or the date of the Issuer's first annual meeting of stockholders immediately following the Grant Date. The Director RSUs were awarded for no consideration other than the Reporting Person's service as a director of the Issuer.

Key Figures

New RSU grant: 482 restricted stock units RSUs exercised: 8,692 restricted stock units Direct common shares held: 552,558 shares +2 more

5 metrics

New RSU grant 482 restricted stock units Awarded to director Guillaume Rutten as equity compensation

RSUs exercised 8,692 restricted stock units Converted into Amkor common stock on March 31, 2026

Direct common shares held 552,558 shares Rutten’s direct Amkor common stock holdings after transactions

Time-vested RSU grant 43,459 restricted stock units Grant vesting in five equal quarterly installments through June 30, 2026

Quarterly vesting schedule 5 equal installments RSUs vest on June 30, Sept 30, Dec 31 2025; March 31, June 30 2026

Key Terms

Restricted Stock Units, time-vested restricted stock units, derivative security, Equity Incentive Plan, +1 more

5 terms

Restricted Stock Units financial

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

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

"granted 43,459 time-vested restricted stock units ("RSUs") which vest in five equal quarterly installments"

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Equity Incentive Plan financial

"granted on April 1, 2025 ... pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

annual meeting of stockholders financial

"will vest in full on the earlier of the first anniversary of the Grant Date or the date of the Issuer's first annual meeting of stockholders"

FAQ

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

What insider transactions did AMKR director Guillaume Rutten report?

Guillaume Rutten reported a grant of 482 restricted stock units and the vesting and exercise of 8,692 restricted stock units into common stock. These are equity compensation events, not open-market purchases or sales, and reflect routine director compensation at Amkor Technology, Inc.

How many Amkor (AMKR) shares does Guillaume Rutten hold after these transactions?

After converting 8,692 restricted stock units into common stock, Guillaume Rutten directly holds 552,558 shares of Amkor common stock. This figure reflects his updated direct ownership position as reported in the Form 4, following the compensation-related equity activity.

What restricted stock unit grant did AMKR director Guillaume Rutten receive?

Rutten received a new award of 482 restricted stock units linked to Amkor common stock. The units were granted as director compensation under Amkor’s 2021 Equity Incentive Plan and can convert into an equal number of common shares once the applicable vesting conditions are satisfied.

What does the 8,692 share RSU exercise mean for Amkor (AMKR)?

The 8,692 share figure reflects restricted stock units that vested and were converted into Amkor common stock for Guillaume Rutten. It represents the settlement of previously granted equity awards, changing form from derivatives to shares, without indicating any open-market buying or selling activity.

How are Guillaume Rutten’s Amkor (AMKR) RSUs structured to vest?

Footnotes describe a 43,459 restricted stock unit grant vesting in five equal quarterly installments through June 30, 2026. Additional director RSUs may vest on the earlier of one year from grant or the first annual stockholders’ meeting, assuming continued service and plan conditions are met.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 04/02/2026 - 06:59 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)
03/31/2026

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	03/31/2026		M		8,692	A	$0	552,558	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	03/31/2026		M			8,692	(1)	(1)	Common Stock	8,692	$0	8,692	D
Restricted Stock Units	$0(2)	04/01/2026		A		482		(2)	(2)	Common Stock	482	$0	482	D

Explanation of Responses:

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

2. Represents shares of common stock underlying RSUs (the "Director RSUs") granted on April 1, 2025 (the "Grant Date") pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended. Subject to the terms and conditions of the applicable award agreement, the Director RSUs may be converted into common stock of the Issuer on a one-for-one basis and will vest in full on the earlier of the first anniversary of the Grant Date or the date of the Issuer's first annual meeting of stockholders immediately following the Grant Date. The Director RSUs were awarded for no consideration other than the Reporting Person's service as a director of the Issuer.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	04/02/2026
	** 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)