Amkor Technology, Inc. (AMKR) director sells 50,000 common shares at weighted prices

Rhea-AI Filing Summary

Amkor Technology, Inc. director Guillaume Marie Jean Rutten reported selling a total of 50,000 shares of Common Stock in two open market or private transactions on August 5 and 6, 2026. The weighted average prices were $55.35 and $54.50 per share, with individual trades executed within disclosed price ranges. The sales were reported as direct ownership transactions and were not indicated as made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Seller: 50,000 shares

Net Sell 2 txns

Insider Rutten Guillaume Marie Jean

Role Director

Sold 50,000 shs ($2.75M)

Type	Security	Shares	Price	Value
Sale	Common Stock F2	25,000	$54.50	$1.36M
Sale	Common Stock F1	25,000	$55.35	$1.38M

Holdings After Transaction: Common Stock — 461,732 shares (Direct)

Footnotes (2)

1. F1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $55.31 to $55.43. 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.
2. F2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $54.48 to $54.62. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, 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 (2) to this Form 4.

Key Figures

Shares sold 2026-08-05: 25,000 shares Shares sold 2026-08-06: 25,000 shares Total shares sold: 50,000 shares +2 more

5 metrics

Shares sold 2026-08-05 25,000 shares Common Stock sale by director Guillaume Rutten at weighted average price $55.35 per share

Shares sold 2026-08-06 25,000 shares Common Stock sale by director Guillaume Rutten at weighted average price $54.50 per share

Total shares sold 50,000 shares Aggregate Common Stock sold on 2026-08-05 and 2026-08-06 by director Guillaume Rutten

Price range 2026-08-05 $55.31–$55.43 per share Range of individual trade prices underlying the $55.35 weighted average sale price

Price range 2026-08-06 $54.48–$54.62 per share Range of individual trade prices underlying the $54.50 weighted average sale price

Key Terms

weighted average price, open market or private transaction, Common Stock

3 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"Sale in open market or private transaction"

Common Stock financial

"security_title: Common Stock"

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.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/07/2026 - 04:36 PM Accepted by SEC EDGAR 08/07/2026 - 04:36 PM Learn about SEC filing dates

FAQ

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

Amkor Technology reported that director Guillaume Marie Jean Rutten sold 50,000 shares of Common Stock in two transactions on August 5 and 6, 2026. Each sale involved 25,000 shares in open market or private transactions at weighted average prices disclosed in the report.

How many AMKR shares did Guillaume Rutten sell on each date and at what prices?

Guillaume Rutten sold 25,000 shares on August 5, 2026 at a weighted average price of $55.35 per share, and another 25,000 shares on August 6, 2026 at a weighted average price of $54.50 per share, all as Common Stock.

What price ranges applied to Guillaume Rutten’s AMKR share sales?

For the August 5, 2026 sale, individual trades occurred between $55.31 and $55.43 per share. For the August 6, 2026 sale, individual trades occurred between $54.48 and $54.62 per share, with reported prices shown as weighted averages.

Were Guillaume Rutten’s AMKR stock sales made under a Rule 10b5-1 trading plan?

The transactions were not indicated as being made under a Rule 10b5-1 trading plan, as the related checkbox was left unchecked. The report does not describe any pre-arranged trading plan governing these August 2026 stock sales.

What type of transactions were reported for Guillaume Rutten’s AMKR shares?

Both transactions were reported as sales of Common Stock coded "S," described as sales in open market or private transactions. The shares were held as direct ownership, and no derivative securities transactions were disclosed in this report.

What position does Guillaume Rutten hold at Amkor Technology (AMKR)?

Guillaume Marie Jean Rutten is reported as a director of Amkor Technology, Inc. He is not identified as an officer or a ten percent owner in this report, and the disclosed stock sales relate to his role as a reporting person and director.

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)
08/05/2026

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	08/05/2026		S		25,000	D	$55.35(1)	486,732	D
Common Stock	08/06/2026		S		25,000	D	$54.5(2)	461,732	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 $55.31 to $55.43. 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.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $54.48 to $54.62. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, 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 (2) to this Form 4.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	08/07/2026
	** 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)