Amkor director exercises RSUs, gets new grant

Q: What is the size and vesting schedule of the new RSU grant to the AMKR director?

The director received a new grant of 2,613 restricted stock units under Amkor’s 2021 Equity Incentive Plan. Subject to award terms, these RSUs vest in full on the earlier of the first anniversary of the grant date or the next annual stockholder meeting.

Q: How were dividend equivalent units treated in the AMKR director’s RSU vesting?

A small portion of dividend equivalent units, equal to 0.0573 RSUs, was settled in cash. The remaining RSUs and associated dividend equivalent units converted into Amkor common stock on a one-for-one basis upon vesting for the director.

AMKOR TECHNOLOGY, INC. director MaryFrances McCourt reported equity compensation-related transactions.

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Form Type

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director MaryFrances McCourt reported equity compensation-related transactions. She exercised previously granted restricted stock units, receiving 9,893 shares of common stock at no cost, bringing her direct ownership to 65,811 common shares. She also received a new award of 2,613 restricted stock units that can convert into common stock on a one-for-one basis, generally vesting on the earlier of one year from the grant date or the company’s next annual stockholder meeting.

Insider Trade Summary

9,893.0573 shares exercised/converted

Exercise 3 txns

Insider McCourt MaryFrances

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	9,893.0573	$0.00	$0.00
Grant/Award	Restricted Stock Units	2,613	$0.00	$0.00
Exercise	Common Stock	9,893	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 2,613 contracts (Direct); Common Stock — 65,811 shares (Direct)

Footnotes (2)

F1. On May 15, 2025, the Reporting Person was granted 9,789 time-vested restricted stock units ("RSUs") pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended (the "Plan"), and the applicable award agreement (the "2025 RSUs"). In connection with the vesting of the 2025 RSUs on May 13, 2026: (i) 0.0573 of the 2025 RSUs, which had accrued as dividend equivalent units ("DEUs") with each DEU representing an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued, were settled in cash; and (ii) the remainder of the 2025 RSUs, including 104 DEUs, converted into common stock of the Issuer on a one-for-one basis.
F2. Represents shares of common stock underlying RSUs granted on May 13, 2026 (the "Grant Date") pursuant to the Plan (the "2026 RSUs"). Subject to the terms and conditions of the applicable award agreement, the 2026 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 2026 RSUs were awarded for no consideration other than the Reporting Person's service as a director of the Issuer.

Key Figures

RSU exercise into common stock: 9,893.0573 shares Common shares held after transaction: 65,811 shares New RSU grant size: 2,613 units +3 more

6 metrics

RSU exercise into common stock 9,893.0573 shares Common stock received from vested RSUs on May 13, 2026

Common shares held after transaction 65,811 shares Direct ownership following RSU conversion

New RSU grant size 2,613 units 2026 RSUs granted on May 13, 2026 under 2021 Equity Incentive Plan

Dividend equivalent units cashed 0.0573 units Portion of 2025 RSUs’ DEUs settled in cash at vesting

Vested 2025 RSUs originally granted 9,789 units Time-vested RSUs granted May 15, 2025, vested May 13, 2026

Exercise/Conversion price $0.00 per unit Stated price for RSU exercises and grant transactions

Key Terms

Restricted Stock Units, dividend equivalent units, 2021 Equity Incentive Plan, vest, +1 more

5 terms

Restricted Stock Units financial

"On May 15, 2025, the Reporting Person was granted 9,789 time-vested restricted stock units ("RSUs") pursuant to the Amkor Technology, Inc. ..."

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.

dividend equivalent units financial

"0.0573 of the 2025 RSUs, which had accrued as dividend equivalent units ("DEUs") with each DEU representing an additional RSU..."

Dividend equivalent units are bookkeeping credits that mirror cash dividends paid on actual shares, granted to holders of stock-based awards such as restricted stock units or deferred compensation. They matter to investors because they increase a company’s reported employee compensation cost and can lead to issuance of more shares or cash payouts over time, similar to extra pay linked to ownership that affects shareholder dilution and corporate cash flow.

2021 Equity Incentive Plan financial

"granted 9,789 time-vested restricted stock units ("RSUs") pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended..."

vest financial

"In connection with the vesting of the 2025 RSUs on May 13, 2026..."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

one-for-one basis financial

"converted into common stock of the Issuer on a one-for-one basis."

FAQ

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

What insider transactions did AMKR director MaryFrances McCourt report on this Form 4?

MaryFrances McCourt reported exercising restricted stock units into 9,893 shares of Amkor common stock and receiving a new grant of 2,613 restricted stock units. These transactions are compensation-related, with no open-market purchases or sales disclosed in this filing.

How many AMKR common shares does MaryFrances McCourt hold after the reported Form 4 transactions?

After the reported transactions, MaryFrances McCourt directly holds 65,811 shares of Amkor common stock. This reflects the shares received from the vesting and conversion of restricted stock units into common stock at a one-for-one conversion ratio.

What is the size and vesting schedule of the new RSU grant to the AMKR director?

The director received a new grant of 2,613 restricted stock units under Amkor’s 2021 Equity Incentive Plan. Subject to award terms, these RSUs vest in full on the earlier of the first anniversary of the grant date or the next annual stockholder meeting.

Were any AMKR insider transactions on this Form 4 open-market buys or sells?

No open-market buys or sells were reported. The Form 4 shows derivative exercises and an RSU grant related to equity compensation, all at a stated price of $0.00 per unit, rather than discretionary market trades in Amkor shares.

How were dividend equivalent units treated in the AMKR director’s RSU vesting?

A small portion of dividend equivalent units, equal to 0.0573 RSUs, was settled in cash. The remaining RSUs and associated dividend equivalent units converted into Amkor common stock on a one-for-one basis upon vesting for the director.

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Accepted by SEC EDGAR 05/15/2026 - 04:41 PM EDT

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^*

McCourt MaryFrances

(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)
05/13/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/13/2026		M		9,893⁽¹⁾	A	$0⁽¹⁾	65,811⁽¹⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	05/13/2026		M			9,893.0573	⁽¹⁾	⁽¹⁾	Common Stock	9,893.0573	$0	0	D
Restricted Stock Units	⁽²⁾	05/13/2026		A		2,613		⁽²⁾	⁽²⁾	Common Stock	2,613	$0	2,613	D

Explanation of Responses:

1. On May 15, 2025, the Reporting Person was granted 9,789 time-vested restricted stock units ("RSUs") pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended (the "Plan"), and the applicable award agreement (the "2025 RSUs"). In connection with the vesting of the 2025 RSUs on May 13, 2026: (i) 0.0573 of the 2025 RSUs, which had accrued as dividend equivalent units ("DEUs") with each DEU representing an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued, were settled in cash; and (ii) the remainder of the 2025 RSUs, including 104 DEUs, converted into common stock of the Issuer on a one-for-one basis.

2. Represents shares of common stock underlying RSUs granted on May 13, 2026 (the "Grant Date") pursuant to the Plan (the "2026 RSUs"). Subject to the terms and conditions of the applicable award agreement, the 2026 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 2026 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 MaryFrances McCourt	05/15/2026
	** 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)

Source: View Original Filing on SEC EDGAR