Amkor director reports sale of 20,000 common AMKR shares

Amkor Technology director Gil C. Tily reported selling 20,000 shares of common stock on December 12, 2025 at a weighted average price of $46.44 per share.

Rhea-AI Filing Summary

Amkor Technology director Gil C. Tily reported selling 20,000 shares of common stock on December 12, 2025 at a weighted average price of $46.44 per share. After this transaction, he directly beneficially owns 123,806 Amkor shares. The sale was executed through multiple trades at prices ranging from $45.91 to $46.83, and the reporting person has committed to provide details of the individual trade prices upon request.

Insider Trade Summary

Net Seller: 20,000 shares

Net Sell 1 txn

Insider Tily Gil C.

Role Director

Sold 20,000 shs ($929K)

Type	Security	Shares	Price	Value
Sale	Common Stock	20,000	$46.44	$929K

Holdings After Transaction: Common Stock — 123,806 shares (Direct)

Footnotes (1)

1. F1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.91 to $46.83. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1) to this Form 4.

FAQ

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

What insider transaction did Amkor Technology (AMKR) report in this filing?

The filing reports that director Gil C. Tily sold 20,000 shares of Amkor Technology common stock.

On what date did Gil C. Tily sell Amkor Technology (AMKR) shares?

Gil C. Tily’s reported sale of Amkor Technology shares occurred on December 12, 2025.

How many Amkor Technology (AMKR) shares did Gil C. Tily sell and at what price?

He sold 20,000 shares at a weighted average price of $46.44 per share, with individual trade prices ranging from $45.91 to $46.83.

How many Amkor Technology (AMKR) shares does Gil C. Tily own after the sale?

Following the reported sale, Gil C. Tily directly beneficially owns 123,806 shares of Amkor Technology common stock.

Were the Amkor Technology (AMKR) shares sold in a single trade or multiple trades?

The shares were sold in multiple transactions at prices between $45.91 and $46.83, resulting in the reported weighted average price.

What is Gil C. Tily’s relationship to Amkor Technology (AMKR)?

Gil C. Tily is reported as a director of Amkor Technology, Inc. in this filing.

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

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Accepted by SEC EDGAR 12/16/2025 - 04:23 PM Learn about SEC filing dates

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^*

Tily Gil C.

(Last) (First) (Middle)

2045 EAST INNOVATION CIRCLE

(Street)

TEMPE AZ 85284

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	12/12/2025		S		20,000	D	$46.44(1)	123,806	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

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.91 to $46.83. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1) to this Form 4.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Gil C. Tily	12/16/2025
	** 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.