Amkor Technology (AMKR) director gains shares and 2,613 new RSUs

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Amkor Technology director Guillaume Marie Jean Rutten reported routine equity compensation activity. On May 13, 2026, 482 previously granted restricted stock units vested and converted into 482 shares of common stock on a one-for-one basis. The filing shows he now holds 503,040 shares of common stock directly after this conversion.

On the same date, Rutten received a new award of 2,613 restricted stock units under Amkor’s 2021 Equity Incentive Plan. These RSUs can convert into the same number of common shares, subject to vesting conditions tied to the earlier of the first anniversary of the grant date or the next annual meeting of stockholders.

Insider Trade Summary

482 shares exercised/converted

Mixed 3 txns

Insider Rutten Guillaume Marie Jean

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	482	$0.00	--
Grant/Award	Restricted Stock Units	2,613	$0.00	--
Exercise	Common Stock	482	$0.00	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 503,040 shares (Direct, null)

Footnotes (1)

On April 1, 2026, the Reporting Person was granted 482 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 "April 2026 RSUs"). In connection with the vesting of the April 2026 RSUs on May 13, 2026, the April 2026 RSUs converted into common stock of the Issuer on a one-for-one basis. Represents shares of common stock underlying RSUs granted on May 13, 2026 (the "Grant Date") pursuant to the Plan (the "May 2026 RSUs"). Subject to the terms and conditions of the applicable award agreement, the May 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 May 2026 RSUs were awarded for no consideration other than the Reporting Person's service as a director of the Issuer.

Key Figures

RSUs vested and converted: 482 shares New RSU grant: 2,613 RSUs Common shares held after transactions: 503,040 shares +1 more

4 metrics

RSUs vested and converted 482 shares Time-vested RSUs converting into common stock on May 13, 2026

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

Common shares held after transactions 503,040 shares Direct ownership following RSU vesting and conversion

Underlying shares for new RSUs 2,613 shares Potential common shares issuable upon vesting of May 2026 RSUs

Key Terms

Restricted Stock Units, 2021 Equity Incentive Plan, vesting, one-for-one basis

4 terms

Restricted Stock Units financial

"Represents shares of common stock underlying RSUs granted on May 13, 2026"

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.

2021 Equity Incentive Plan financial

"pursuant to the Amkor Technology, Inc. 2021 Equity Incentive Plan, as amended"

vesting financial

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

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.

one-for-one basis financial

"the April 2026 RSUs converted into common stock of the Issuer on a one-for-one basis"

Form 4 Insider Transactions: What Each Field Means →

05/15/2026 - 04:37 PM

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)
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		482⁽¹⁾	A	$0⁽¹⁾	503,040⁽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			482	⁽¹⁾	⁽¹⁾	Common Stock	482	$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 April 1, 2026, the Reporting Person was granted 482 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 "April 2026 RSUs"). In connection with the vesting of the April 2026 RSUs on May 13, 2026, the April 2026 RSUs 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 "May 2026 RSUs"). Subject to the terms and conditions of the applicable award agreement, the May 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 May 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 Guillaume Marie Jean Rutten	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

FAQ

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

Guillaume Rutten reported vesting of 482 restricted stock units into 482 Amkor common shares and received a new grant of 2,613 restricted stock units. These transactions reflect routine equity compensation for his service as a director, with no open-market buying or selling.

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

After the reported transactions, Guillaume Rutten holds 503,040 shares of Amkor common stock directly. He also has 2,613 restricted stock units outstanding, which may convert into the same number of shares once vesting conditions under the 2021 Equity Incentive Plan are met.

What new restricted stock units did Amkor (AMKR) grant to director Guillaume Rutten?

Amkor granted Guillaume Rutten 2,613 restricted stock units on May 13, 2026 under its 2021 Equity Incentive Plan. These RSUs 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 shareholder meeting.

Did Amkor (AMKR) director Guillaume Rutten buy or sell shares in the market?

The filing shows no open-market purchases or sales by Guillaume Rutten. Instead, 482 shares of common stock were acquired through the vesting and conversion of previously granted restricted stock units, and a new grant of 2,613 restricted stock units was awarded as compensation.

How were the 482 Amkor (AMKR) shares acquired by director Guillaume Rutten?

The 482 shares were acquired when time-vested restricted stock units granted on April 1, 2026 vested on May 13, 2026. Those RSUs converted into Amkor common stock on a one-for-one basis, reflecting a standard equity award vesting rather than a cash purchase on the market.