Amkor Technology director proposes $275K share sale

Amkor Technology, Inc. (AMKR) director Douglas A. Alexander reported a proposed sale of 5,000 common shares, with an aggregate market value of $275,000 and an approximate sale date of October 2, 2026, through Morgan Stanley Smith Barney LLC.

Rhea-AI Filing Summary

Amkor Technology, Inc. (AMKR) director Douglas A. Alexander reported a proposed sale of 5,000 common shares, with an aggregate market value of $275,000 and an approximate sale date of October 2, 2026, through Morgan Stanley Smith Barney LLC. The reported activity also includes 5,000 common shares acquired from the issuer through a stock option exercise for cash on October 2, 2026, plus a prior sale of 5,000 shares for $279,050 on August 7, 2026.

Key Figures

Proposed sale: 5,000 shares Aggregate market value: $275,000 Approximate sale date: October 2, 2026 +4 more

7 metrics

Proposed sale 5,000 shares Common shares

Aggregate market value $275,000 Proposed sale

Approximate sale date October 2, 2026 Proposed sale

Shares outstanding 248,452,472 shares Figure listed in the securities information

Shares acquired through stock option exercise 5,000 shares October 2, 2026; cash payment

Prior shares sold 5,000 shares August 7, 2026

Value of prior sale $279,050 August 7, 2026

Key Terms

Rule 144, Stock Option Exercise, Federal Criminal Violations

3 terms

Rule 144 regulatory

"sales required by paragraph (e) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock Option Exercise financial

"Stock Option Exercise"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Federal Criminal Violations regulatory

"constitute Federal Criminal Violations"

FAQ

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How many AMKR shares did Douglas A. Alexander plan to sell?

Douglas A. Alexander's proposed sale was 5,000 common shares, with an aggregate market value of $275,000 and an approximate sale date of October 2, 2026. Morgan Stanley Smith Barney LLC is identified in connection with the sale.

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

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Available on EDGAR 10/02/2026 - 04:02 PM Accepted by SEC EDGAR 10/02/2026 - 04:01 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001195858
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	AMKOR TECHNOLOGY, INC.
SEC File Number	000-29472
Address of Issuer	2045 East Innovation Circle Tempe ARIZONA 85284
Phone	(480) 821-5000
Name of Person for Whose Account the Securities are To Be Sold	DOUGLAS A ALEXANDER
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	5000	275000.00	248452472	10/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	10/02/2026	Stock Option Exercise	Issuer			5000	10/02/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
DOUGLAS A ALEXANDER 2045 East Innovation Circle Tempe AZ 85284	Common	08/07/2026	5000	279050.00

144: Remarks and Signature

Remarks
Date of Notice	10/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/08/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Douglas A. Alexander
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)