Director at Amkor (NASDAQ: AMKR) sells 50,000 shares, holds 502k

Rhea-AI Filing Summary

Amkor Technology director Guillaume Marie Jean Rutten reported an open‑market sale of 50,000 shares of Common Stock on May 8, 2026. The weighted average sale price was $74.28 per share, with individual trades executed between $73.37 and $74.98. After these transactions, Rutten directly holds 502,558 Amkor shares, indicating he retains a substantial ownership stake in the company.

Insider Trade Summary

Net Seller: 50,000 shares ($3,714,000)

Net Sell 1 txn

Insider Rutten Guillaume Marie Jean

Role null

Sold 50,000 shs ($3.71M)

Type	Security	Shares	Price	Value
Sale	Common Stock	50,000	$74.28	$3.71M

Holdings After Transaction: Common Stock — 502,558 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 50,000 shares Weighted average sale price: $74.28 per share Sale price range: $73.37–$74.98 per share +1 more

4 metrics

Shares sold 50,000 shares Open-market sale of Amkor common stock on May 8, 2026

Weighted average sale price $74.28 per share Average price for 50,000 Amkor shares sold

Sale price range $73.37–$74.98 per share Range of prices for multiple sale executions

Shares held after transaction 502,558 shares Director’s direct Amkor holding following the sale

Key Terms

weighted average price, open-market sale, Form 4, Common Stock

4 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 sale financial

"transaction_action": "open-market sale""

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.

Form 4 regulatory

"within the range set forth in this footnote (1) to this Form 4."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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.

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^*

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)
05/08/2026

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	05/08/2026		S		50,000	D	$74.28(1)	502,558	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 $73.37 to $74.98. 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 Guillaume Marie Jean Rutten	05/12/2026
	** 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 insider transaction did Amkor Technology (AMKR) report for Guillaume Rutten?

Amkor Technology reported that director Guillaume Marie Jean Rutten sold 50,000 shares of Common Stock. The transaction was an open‑market sale and was disclosed on Form 4, reflecting routine insider trading transparency requirements for company directors.

At what prices did Guillaume Rutten sell Amkor Technology (AMKR) shares?

The weighted average sale price was $74.28 per Amkor share. According to the disclosure, the shares were sold in multiple trades at prices ranging from $73.37 to $74.98, reflecting typical execution across a trading range during the transaction date.

How many Amkor Technology (AMKR) shares does Guillaume Rutten hold after the sale?

After the reported sale, Guillaume Rutten directly holds 502,558 Amkor shares. This post‑transaction balance shows he continues to maintain a significant equity position in the company, despite selling 50,000 shares in open‑market transactions on May 8, 2026.

Was the Amkor Technology (AMKR) insider transaction an open‑market sale?

Yes, the transaction was classified as an open‑market sale of common stock. The Form 4 identifies the transaction code as “S,” meaning a sale in open market or private transaction, and characterizes it specifically as an open‑market sale of 50,000 shares.

How is the sale price range for Guillaume Rutten’s Amkor (AMKR) trade described?

The filing reports a single weighted average price plus a detailed price range. While $74.28 is the weighted average, the Form 4 notes that the individual trades occurred at prices between $73.37 and $74.98 across multiple executions that day.