Amkor director exercises options and sells 5,000 shares

Amkor Technology, Inc. director Douglas A. Alexander exercised stock options and sold shares on August 7, 2026.

Accepted by SEC EDGAR 08/11/2026 - 04:36 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Amkor Technology, Inc. director Douglas A. Alexander exercised stock options and sold shares on August 7, 2026. He exercised a Director Stock Option to acquire 5,000 shares of common stock at an exercise price of $8.51 per share, then sold 5,000 shares of common stock at $55.81 per share in a sale described as an open market or private transaction. The option exercised was part of a grant covering 20,000 shares that vested in full on May 1, 2019. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted on May 8, 2026.

Insider Trade Summary 10b5-1

Exercise and Sale: 5,000 shares ($237K approx. pre-tax spread)

Exercise and Sale 3 txns

Insider ALEXANDER DOUGLAS A

Role Director

Sold 5,000 shs ($279K)

Approx. gross sale proceeds $279K

Approx. exercise cost $43K

Approx. pre-tax spread $237K

Share of Position Sold 14.7%

Type	Security	Shares	Price	Value
Exercise	Director Stock Option (Right-to-Buy) F2	5,000	$0.00	$0.00
Exercise	Common Stock	5,000	$8.51	$43K
Sale	Common Stock F1	5,000	$55.81	$279K

Holdings After Transaction: Director Stock Option (Right-to-Buy) — 14,657 contracts (Direct); Common Stock — 29,109 shares (Direct)

Holdings Before and After: Director Stock Option (Right-to-Buy), 19,657 to 14,657 contracts (Direct); Common Stock, 29,109 to 29,109 shares (Direct)

Other Insiders: 4 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (2)

1. F1. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026.
2. F2. This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 1, 2018, vested in full on May 1, 2019.

Key Figures

Options exercised: 5,000 shares Option exercise price: $8.51 per share Shares sold: 5,000 shares +2 more

5 metrics

Options exercised 5,000 shares Director Stock Option converted into common stock on August 7, 2026

Option exercise price $8.51 per share Exercise price of Director Stock Option granted May 1, 2018

Shares sold 5,000 shares Common stock sale on August 7, 2026 in open market or private transaction

Sale price $55.81 per share Per-share price for 5,000 common shares sold on August 7, 2026

Original option grant size 20,000 shares Stock option grant to acquire 20,000 shares, fully vested May 1, 2019

Key Terms

Rule 10b5-1 trading plan, Director Stock Option (Right-to-Buy), Exercise or conversion of derivative security, open market or private transaction

4 terms

Rule 10b5-1 trading plan regulatory

"The sale reported ... was effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Director Stock Option (Right-to-Buy) financial

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

Exercise or conversion of derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

open market or private transaction financial

"transaction_code_description: Sale in open market or private transaction"

FAQ

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

What transactions did AMKR director Douglas A. Alexander report in this Form 4?

Douglas A. Alexander reported exercising options for 5,000 shares of Amkor Technology common stock at $8.51 per share and selling 5,000 shares at $55.81 per share in an open market or private transaction on August 7, 2026.

Was the August 7, 2026 AMKR stock sale under a Rule 10b5-1 plan?

Yes, the reported sale of 5,000 shares of Amkor Technology common stock at $55.81 per share was effected pursuant to a Rule 10b5-1 trading plan adopted by Douglas A. Alexander on May 8, 2026, indicating a pre-arranged trading framework.

What was the exercise price of the options Douglas A. Alexander exercised at AMKR?

The Director Stock Option exercised by Douglas A. Alexander had an exercise price of $8.51 per share for 5,000 underlying shares of Amkor Technology common stock, originating from a grant that covered 20,000 shares and fully vested on May 1, 2019.

How many Amkor Technology shares did Douglas A. Alexander sell according to this Form 4?

He sold 5,000 shares of Amkor Technology common stock at a per-share price of $55.81 on August 7, 2026, in a transaction characterized as a sale in the open market or a private transaction, following the same-day option exercise.

What option grant is related to Douglas A. Alexander’s recent AMKR transactions?

The exercise relates to a stock option to acquire 20,000 shares of Amkor Technology common stock, granted on May 1, 2018 and fully vested on May 1, 2019. On August 7, 2026, he exercised 5,000 of those underlying shares at $8.51 per share.

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

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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).

X

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^*

ALEXANDER DOUGLAS A

(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)
08/07/2026

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	08/07/2026		M		5,000	A	$8.51	34,109	D
Common Stock	08/07/2026		S(1)		5,000	D	$55.81	29,109	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)	$8.51	08/07/2026		M			5,000	05/01/2019(2)	05/01/2028	Common Stock	5,000	$0	14,657	D

Explanation of Responses:

1. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026.

2. This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 1, 2018, vested in full on May 1, 2019.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Douglas A. Alexander	08/11/2026
	** 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)