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  4. [Form 4] AMKOR TECHNOLOGY, INC. Insider Trading Activity

Amkor Technology (NASDAQ: AMKR) CEO logs 10,000-share sale under 10b5-1 plan

Filing Impact
(High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Amkor Technology, Inc. reports that its President and CEO, who is also a Director, executed a planned stock sale. On 12/15/2025, the reporting person sold 10,000 shares of Amkor common stock at a weighted average price of $44.80 per share, as disclosed in Table I. This transaction was carried out under a Rule 10b5-1 trading plan adopted on June 6, 2025, meaning the sale followed a pre-established schedule rather than being made at the insider’s discretion at the time of sale.

After this transaction, the reporting person beneficially owns 336,699 shares of Amkor common stock in direct form. The filing notes that the actual sales occurred in multiple trades at prices ranging from $44.37 to $45.18 per share, and the insider has undertaken to provide detailed breakdowns of the share amounts at each price upon request.

Positive

  • None.

Negative

  • None.
Insider Rutten Guillaume Marie Jean
Role President and CEO
Sold 10,000 shs ($448K)
Type Security Shares Price Value
Sale Common Stock 10,000 $44.80 $448K
Holdings After Transaction: Common Stock — 336,699 shares (Direct)
Footnotes (1)
  1. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 06, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.37 to $45.18. 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 (2) to this Form 4.
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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).
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*
Rutten Guillaume Marie Jean
(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
X Officer (give title below) Other (specify below)
President and CEO
3. Date of Earliest Transaction (Month/Day/Year)
12/15/2025
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 12/15/2025 S(1) 10,000 D $44.8(2) 336,699 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 sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 06, 2025.
2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.37 to $45.18. 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 (2) to this Form 4.
Remarks:
/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten 12/17/2025
** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Amkor Technology (AMKR) report in this Form 4?

The President and CEO, who is also a Director, reported selling 10,000 shares of Amkor Technology common stock on 12/15/2025 at a weighted average price of $44.80 per share.

Was the AMKR CEO’s stock sale under a Rule 10b5-1 trading plan?

Yes. The filing states the sale was effected pursuant to a Rule 10b5-1 trading plan that the reporting person adopted on June 06, 2025.

How many AMKR shares does the reporting person own after this transaction?

Following the reported sale, the reporting person beneficially owns 336,699 shares of Amkor Technology common stock in direct ownership.

What price range were the AMKR shares sold for in this insider transaction?

The filing explains that the $44.80 figure is a weighted average, with individual trades executed at prices ranging from $44.37 to $45.18 per share.

Who signed the AMKR Form 4 for this insider transaction?

The Form 4 was signed by /s/ Mark N. Rogers as Attorney-in-Fact for Guillaume Marie Jean Rutten, the reporting person.

Does the Form 4 offer more detail on the number of AMKR shares sold at each price?

Yes. The reporting person undertakes to provide the number of shares sold at each separate price within the $44.37 to $45.18 range upon request to regulators, the issuer, or any security holder.