Amkor director exercises RSUs, gets new grant

Amkor Technology director David N. Watson reported routine equity compensation activity.

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Rhea-AI Filing Summary

Amkor Technology director David N. Watson reported routine equity compensation activity. On May 13, 2026, previously granted restricted stock units from a May 15, 2025 award vested, and 9,893.0573 RSUs (including associated dividend equivalent units) converted into an equal number of shares of common stock. A small portion, 0.0573 of the dividend equivalent units, was settled in cash rather than shares. On the same date, Watson received a new grant of 2,613 restricted stock units under Amkor’s 2021 Equity Incentive Plan, which can convert into common stock on a one-for-one basis and will vest in full on the earlier of the first anniversary of the grant date or the next annual stockholders’ meeting. Following these transactions, Watson directly holds 130,650 shares of common stock and 2,613 RSUs.

Insider Trade Summary

9,893.0573 shares exercised/converted

Exercise 3 txns

Insider WATSON DAVID N

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 — 130,650 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

RSUs converted to common stock: 9,893.0573 units Cash-settled dividend equivalent units: 0.0573 units New RSU grant: 2,613 units +3 more

6 metrics

RSUs converted to common stock 9,893.0573 units 2025 RSUs and dividend equivalent units vested on May 13, 2026

Cash-settled dividend equivalent units 0.0573 units Portion of 2025 RSUs’ DEUs settled in cash at vesting

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

Common shares held after transactions 130,650 shares Direct ownership after RSUs converted on May 13, 2026

RSUs originally granted in 2025 award 9,789 units Time-vested RSUs granted May 15, 2025 that vested May 13, 2026

Dividend equivalent units added to 2025 RSUs 104 units DEUs accruing as additional RSUs subject to same terms

Key Terms

Restricted Stock Units, dividend equivalent units, 2021 Equity Incentive Plan, time-vested

4 terms

Restricted Stock Units financial

"Represents shares of common stock underlying RSUs granted on May 13, 2026 (the "Grant Date") pursuant to the Plan (the "2026 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.

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, were settled in cash."

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 (the "Plan")."

time-vested financial

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

Time-vested describes a right—such as stock options, restricted shares, or pension benefits—that becomes fully owned by an individual only after they have waited for or worked through a specified period. For investors, it matters because these delayed ownership rules affect when insiders or employees can sell shares, which influences share supply, executive incentives, and the timing of potential stock dilution or insider-driven stock sales.

FAQ

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

What did Amkor (AMKR) director David N. Watson report in this Form 4?

David N. Watson reported routine equity compensation activity. Previously granted restricted stock units vested and converted into common shares, and he received a new RSU grant that vests based on continued board service, with no open-market stock purchases or sales disclosed.

How many Amkor shares does David N. Watson hold after these transactions?

After these transactions, David N. Watson directly holds 130,650 shares of Amkor common stock. In addition, he holds 2,613 restricted stock units that may convert into an equal number of shares upon vesting, subject to the terms of the applicable award agreement.

How many restricted stock units vested and turned into Amkor common stock?

A total of 9,893.0573 restricted stock units, including associated dividend equivalent units, converted into Amkor common stock on a one-for-one basis. A very small portion, 0.0573 units, was settled in cash, while the remaining vested units became common shares held directly.

What new RSU grant did David N. Watson receive from Amkor (AMKR)?

Watson received 2,613 new restricted stock units on May 13, 2026 under Amkor’s 2021 Equity Incentive Plan. These RSUs may convert into common stock on a one-for-one basis and will vest in full on the earlier of one year from grant or the next annual stockholders’ meeting.

Were any of David N. Watson’s Amkor RSUs settled in cash?

Yes. Of the 2025 restricted stock units vesting on May 13, 2026, 0.0573 units that had accrued as dividend equivalent units were settled in cash. The remainder of that RSU award, including additional dividend equivalent units, converted into Amkor common stock at a one-for-one rate.

Did David N. Watson buy or sell Amkor (AMKR) shares on the market?

The transactions reflect equity compensation events, not open-market trading. Vested restricted stock units converted into common stock, and a new RSU grant was awarded for board service. The filing does not report any open-market purchases or sales of Amkor shares by Watson.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 05/15/2026 - 04:35 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^*

WATSON DAVID N

(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⁾	130,650⁽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⁾	⁽¹⁾	Common Stock	9,893.0573⁽¹⁾	$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 David N. Watson	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