Amkor director exercises options, sells 5,000 shares

Amkor Technology director Winston J. Churchill reported an exercise-and-sell transaction in company stock.

Accepted by SEC EDGAR 06/16/2026 - 04:35 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Amkor Technology director Winston J. Churchill reported an exercise-and-sell transaction in company stock. He exercised stock options to acquire 5,000 shares of Common Stock at $19.39 per share, then sold 5,000 shares in an open-market sale at $78.20 per share on June 12, 2026. Following these transactions, his directly held position remained at 28,781 Common Stock shares, indicating the option exercise and sale largely served as a liquidity event without changing his overall share count.

Insider Trade Summary

Exercise and Sale: 5,000 shares ($294K approx. pre-tax spread)

Exercise and Sale 3 txns

Insider CHURCHILL WINSTON J

Role Director

Sold 5,000 shs ($391K)

Approx. gross sale proceeds $391K

Approx. exercise cost $97K

Approx. pre-tax spread $294K

Share of Position Sold 14.8%

Type	Security	Shares	Price	Value
Exercise	Director Stock Option (Right-to-Buy)	5,000	$0.00	$0.00
Exercise	Common Stock	5,000	$19.39	$97K
Sale	Common Stock	5,000	$78.20	$391K

Holdings After Transaction: Director Stock Option (Right-to-Buy) — 10,000 contracts (Direct); Common Stock — 28,781 shares (Direct)

Holdings Before and After: Director Stock Option (Right-to-Buy), 15,000 to 10,000 contracts (Direct); Common Stock, 28,781 to 28,781 shares (Direct)

Other Insiders: 2 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (1)

1. F1. This stock option to acquire 20,000 shares of Common Stock of Amkor Technology, Inc. was granted on May 18, 2021 and vested in full on May 17, 2022.

Key Figures

Shares sold: 5,000 shares Sale price: $78.20/share Shares acquired via exercise: 5,000 shares +2 more

5 metrics

Shares sold 5,000 shares Common Stock sold in open-market transaction

Sale price $78.20/share Price for 5,000 Common Stock shares sold

Shares acquired via exercise 5,000 shares Common Stock from option exercise

Option exercise price $19.39/share Exercise price of Director Stock Option

Shares held after 28,781 shares Direct Common Stock holdings after transactions

Key Terms

open-market sale, Director Stock Option (Right-to-Buy), Exercise or conversion of derivative security, Common Stock

4 terms

open-market sale financial

"then sold 5,000 shares in an open-market sale at"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

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""

Common Stock financial

"to acquire 5,000 shares of Common Stock at"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What insider transaction did AMKR director Winston J. Churchill report?

Winston J. Churchill reported an exercise-and-sell transaction involving 5,000 Amkor Technology shares. He exercised options for 5,000 Common Stock shares, then sold 5,000 shares in an open-market trade, leaving his overall share count unchanged after the activity.

How many AMKR shares did Winston J. Churchill sell and at what price?

He sold 5,000 shares of Amkor Technology Common Stock at $78.20 per share. The filing classifies this as an open-market or private sale, reflecting a discretionary disposition of shares acquired through previously granted director stock options.

What stock options did Winston J. Churchill exercise in this AMKR Form 4?

He exercised director stock options covering 5,000 shares of Amkor Technology Common Stock at an exercise price of $19.39 per share. These options were part of a grant originally issued on May 18, 2021, which fully vested on May 17, 2022.

How many AMKR shares does Winston J. Churchill hold after these transactions?

After the reported transactions, Winston J. Churchill directly holds 28,781 shares of Amkor Technology Common Stock. His holdings were temporarily increased by the option exercise, then returned to this same level after selling 5,000 shares on the open market.

What does the AMKR Form 4 reveal about Churchill’s net share change?

The Form 4 shows no net change in his overall Common Stock holdings. He acquired 5,000 shares by exercising options at $19.39, then sold 5,000 shares at $78.20, ending with the same 28,781-share direct position he held before the transactions.

Are any AMKR derivative securities reported as remaining after this Form 4?

The filing’s derivative summary shows no remaining derivative positions after this transaction. The reported activity includes the exercise of a Director Stock Option tied to 5,000 underlying Common Stock shares, followed by a sale of 5,000 shares acquired through that exercise.

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

Form 4 Insider Transactions: What Each Field Means →

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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).

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^*

CHURCHILL WINSTON J

(Last) (First) (Middle)

500 SE MIZNER BLVD.

APT 305A

(Street)

BOCA RATON FLORIDA 33432-6083

(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)
06/12/2026

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	06/12/2026		M		5,000	A	$19.39	33,781	D
Common Stock	06/12/2026		S		5,000	D	$78.2	28,781	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)	$19.39	06/12/2026		M			5,000	(1)	05/18/2031	Common Stock	5,000	$0	10,000	D

Explanation of Responses:

1. This stock option to acquire 20,000 shares of Common Stock of Amkor Technology, Inc. was granted on May 18, 2021 and vested in full on May 17, 2022.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Winston J. Churchill	06/16/2026
	** 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)