Amkor (NASDAQ: AMKR) director exercises options, holds 134,977 shares

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director Robert Randolph Morse exercised stock options and settled related taxes using shares. He exercised a Director Stock Option covering 20,000 shares of Common Stock at an exercise price of $5.66 per share in a net exercise with the issuer.

To cover the exercise price or tax liability, 2,378 shares of Common Stock were disposed of in a tax-withholding transaction. Following these events, Morse holds 134,977 shares of Amkor Common Stock directly. No shares were bought or sold in the open market, and the option, granted in 2016 and fully vested in 2017, is now fully exercised.

Insider Trade Summary

20,000 shares exercised/converted

Mixed 3 txns

Insider Morse Robert Randolph

Role Director

Type	Security	Shares	Price	Value
Exercise	Director Stock Option (Right-to-Buy)	20,000	$0.00	--
Exercise	Common Stock	20,000	$5.66	$113K
Tax Withholding	Common Stock	2,378	$0.00	--

Holdings After Transaction: Director Stock Option (Right-to-Buy) — 0 shares (Direct); Common Stock — 137,355 shares (Direct)

Footnotes (1)

1. Exempt purchase under Section 16b-3. Transaction executed as net exercise executed with Amkor Technology, Inc. (the "Issuer"), in which no shares were purchased or sold in the open market. This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 4, 2016 and vested in full on May 2, 2017.

Key Figures

Options exercised: 20,000 shares Exercise price: $5.66 per share Shares withheld for taxes: 2,378 shares +4 more

7 metrics

Options exercised 20,000 shares Director Stock Option exercised on April 7, 2026

Exercise price $5.66 per share Exercise or conversion price of Director Stock Option

Shares withheld for taxes 2,378 shares Tax-withholding disposition linked to option exercise

Shares held after transactions 134,977 shares Common Stock directly owned following Form 4 transactions

Option grant date May 4, 2016 Grant date of 20,000-share Director Stock Option

Option vesting date May 2, 2017 Date option vested in full before later exercise

Option expiration date May 4, 2026 Expiration date of Director Stock Option now fully exercised

Key Terms

Director Stock Option (Right-to-Buy), net exercise, Section 16b-3, tax-withholding disposition, +1 more

5 terms

Director Stock Option (Right-to-Buy) financial

"security_title: "Director Stock Option (Right-to-Buy)""

net exercise financial

"Transaction executed as net exercise executed with Amkor Technology, Inc."

Section 16b-3 regulatory

"Exempt purchase under Section 16b-3."

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.

Exercise or conversion of derivative security financial

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

Form 4 Insider Transactions: What Each Field Means →

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^*

Morse Robert Randolph

(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)
04/07/2026

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	04/07/2026		M		20,000	A	$5.66	137,355	D
Common Stock	04/07/2026		F(1)		2,378	D	$0	134,977	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
Director Stock Option (Right-to-Buy)	$5.66	04/07/2026		M			20,000	05/04/2017(2)	05/04/2026(2)	Common Stock	20,000	$0	0	D

Explanation of Responses:

1. Exempt purchase under Section 16b-3. Transaction executed as net exercise executed with Amkor Technology, Inc. (the "Issuer"), in which no shares were purchased or sold in the open market.

2. This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 4, 2016 and vested in full on May 2, 2017.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Robert R. Morse	04/09/2026
	** 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)

FAQ

What did Amkor (AMKR) director Robert Morse report in this Form 4?

Robert Morse reported exercising stock options for 20,000 Amkor shares through a net exercise. The transaction was exempt under Section 16b-3, involved no open-market trades, and was paired with a share-based tax payment, leaving him with 134,977 common shares held directly.

How many Amkor (AMKR) shares did Robert Morse acquire and at what price?

Morse exercised options to acquire 20,000 shares of Amkor Common Stock at an exercise price of $5.66 per share. This came from a Director Stock Option grant, converting a previously granted derivative award into actual common shares held directly.

Were any of Robert Morse’s Amkor (AMKR) transactions open-market buys or sells?

No, none of the transactions were open-market trades. The filing states the option exercise was a net exercise with Amkor, and no shares were purchased or sold in the open market, with shares only used to satisfy exercise price or tax obligations.

How many Amkor (AMKR) shares were used to cover taxes or exercise costs?

A total of 2,378 Amkor Common Stock shares were disposed of in a tax-withholding transaction. This disposition covered the exercise price or tax liability tied to the option exercise and did not represent an open-market sale to outside investors.

What are Robert Morse’s Amkor (AMKR) holdings after these transactions?

After the option exercise and tax-withholding disposition, Robert Morse holds 134,977 shares of Amkor Common Stock directly. This figure reflects his updated non-derivative ownership position following conversion of the option grant into common shares.

When was the Amkor (AMKR) stock option originally granted and when did it vest?

The stock option to acquire 20,000 Amkor Common Stock shares was granted on May 4, 2016. According to the filing, the option vested in full on May 2, 2017, and has now been fully exercised before its stated 2026 expiration date.