Amkor CEO exercises RSUs, shares withheld for taxes

Amkor Technology, Inc. President and CEO Kevin K. Engel exercised restricted stock units and had shares withheld for taxes.

Rhea-AI Filing Summary

Amkor Technology, Inc. President and CEO Kevin K. Engel exercised restricted stock units and had shares withheld for taxes. On March 31, 2026, 8,692 restricted stock units converted into 8,692 shares of common stock. Of these, 3,725 shares were withheld by Amkor at $45.03 per share to cover Engel's tax obligations, with taxes paid by the company. After these compensation-related transactions, Engel directly held 7,920 shares of Amkor common stock. The RSUs were part of a 43,459-unit grant made on February 20, 2025 under Amkor's 2021 Equity Incentive Plan, vesting in five equal quarterly installments through June 30, 2026.

Insider Trade Summary

8,692 shares exercised/converted

Exercise 3 txns

Insider Engel Kevin K.

Role President and CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	8,692	$0.00	$0.00
Exercise	Common Stock	8,692	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	3,725	$45.03	$168K

Holdings After Transaction: Restricted Stock Units — 8,692 contracts (Direct); Common Stock — 7,920 shares (Direct)

Footnotes (2)

1. F1. 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. F2. 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.

Key Figures

RSUs exercised: 8,692 units Shares withheld for taxes: 3,725 shares Withholding price: $45.03 per share +3 more

6 metrics

RSUs exercised 8,692 units Restricted Stock Units converted into common stock on March 31, 2026

Shares withheld for taxes 3,725 shares Common stock withheld to satisfy tax obligations at vesting

Withholding price $45.03 per share Value used for tax withholding on 3,725 shares

Post-transaction holdings 7,920 shares Common stock directly held after transactions

Total RSU grant 43,459 RSUs Grant made on February 20, 2025 under 2021 Equity Incentive Plan

Vesting schedule 5 equal quarterly installments RSUs vest from June 30, 2025 through June 30, 2026

Key Terms

Restricted Stock Units, tax withholding obligations, Equity Incentive Plan, vesting, +1 more

5 terms

Restricted Stock Units financial

"The transaction represents shares withheld by Amkor Technology, Inc. ... in connection with the vesting of certain restricted stock units"

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.

tax withholding obligations financial

"These shares were withheld to satisfy the Reporting Person's tax withholding obligations."

Equity Incentive Plan financial

"pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement."

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.

vesting financial

"RSUs which vest in five equal quarterly installments on each of June 30, 2025..."

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

FAQ

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

What insider transaction did AMKR President and CEO Kevin Engel report?

Kevin Engel reported exercising 8,692 restricted stock units into common shares and a related tax withholding transaction. Amkor withheld 3,725 shares at $45.03 per share to satisfy his tax obligations, leaving him with 7,920 shares of common stock held directly afterward.

How many restricted stock units were granted to AMKR CEO Kevin Engel and how do they vest?

Kevin Engel was granted 43,459 restricted stock units on February 20, 2025. They vest in five equal quarterly installments on June 30, 2025, September 30, 2025, December 31, 2025, March 31, 2026, and June 30, 2026, so that all 43,459 units are vested by June 30, 2026.

How many AMKR shares were withheld to cover Kevin Engel’s taxes?

Amkor withheld 3,725 shares of common stock from Kevin Engel’s vested units. These shares were valued at $45.03 per share for withholding purposes, and the company will pay the related taxes on his behalf, reflecting a tax-settlement mechanism rather than an open-market sale.

How many AMKR shares does Kevin Engel hold after this Form 4 transaction?

Following the reported transactions, Kevin Engel directly holds 7,920 shares of Amkor common stock. This reflects the net position after 8,692 RSUs converted into common stock and 3,725 of those shares were withheld by the company to satisfy his tax withholding obligations.

Is Kevin Engel’s AMKR Form 4 transaction an open-market sale of shares?

No, the disposition reported is for tax withholding purposes, not an open-market sale. Amkor withheld 3,725 shares from vested restricted stock units and will pay taxes on his behalf, as described in the footnote referencing tax withholding obligations under its equity incentive plan.

Under which plan were Kevin Engel’s AMKR restricted stock units granted?

The restricted stock units were granted under Amkor Technology, Inc.’s 2021 Equity Incentive Plan, as amended. The grant of 43,459 RSUs on February 20, 2025 vests in five equal quarterly installments, with full vesting scheduled to occur on June 30, 2026, subject to that plan’s terms.

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

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Accepted by SEC EDGAR 04/02/2026 - 06:52 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^*

Engel Kevin K.

(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
X	Officer (give title below)		Other (specify below)
	President and CEO

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	11,645	D
Common Stock	03/31/2026		F(1)		3,725	D	$45.03	7,920	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	(2)	(2)	Common Stock	8,692	$0	8,692	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:

	/s/ Mark N. Rogers, Attorney-in-Fact for Kevin Engel	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)