# EDGAR Filing Document

**Accession Number:** 0001047127
**File Stem:** 0001193125-26-140286
**Filing Date:** 2026-4
**Character Count:** 4616
**Document Hash:** a1af6af228cd5cd9342590fcd54cf041
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-140286.hdr.sgml**: 20260402

**ACCESSION NUMBER**: 0001193125-26-140286

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260402

**DATE AS OF CHANGE**: 20260402

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMKOR TECHNOLOGY, INC.
- **CENTRAL INDEX KEY:** 0001047127
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 231722724
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-29472
- **FILM NUMBER:** 26834327

**BUSINESS ADDRESS:**
- **STREET 1:** 2045 EAST INNOVATION CIRCLE
- **CITY:** TEMPE
- **STATE:** AZ
- **ZIP:** 85284
- **BUSINESS PHONE:** 480-821-5000

**MAIL ADDRESS:**
- **STREET 1:** 2045 EAST INNOVATION CIRCLE
- **CITY:** TEMPE
- **STATE:** AZ
- **ZIP:** 85284

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AMKOR TECHNOLOGY INC
- **DATE OF NAME CHANGE:** 19971001

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**SCHEDULE 14A** 

**PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE** 

**SECURITIES EXCHANGE ACT OF 1934** 

**(Amendment No.)** 

Filed by the Registrant ☒ Filed by a party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

## AMKOR TECHNOLOGY, INC.
**(Name of Registrant as Specified In Its Charter)** 

**(Names of Person(s) Filing Proxy Statement, if other than the Registrant)** 

Payment of Filing Fee (Check the appropriate box):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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![LOGO](g943236dsp002.jpg)

Your Vote Counts! AMKOR TECHNOLOGY, INC. 2026 Annual Meeting Vote by May 12, 2026 11:59 PM ET AMKOR TECHNOLOGY, INC. 2045 EAST INNOVATION CIRCLE TEMPE, ARIZONA 85284 V87381-P46885 You invested in AMKOR TECHNOLOGY, INC. and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 13, 2026. Get informed before you vote View the Notice and Proxy Statement, Annual Report and Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 29, 2026. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Vote Virtually at the Meeting\* May 13, 2026 11:30 a.m., Eastern Time Smartphone users Point your camera here and vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/AMKR2026 \*Please check the meeting materials for any special requirements for meeting attendance.

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![LOGO](g943236dsp003.jpg)

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Voting ItemsRecommends1.Election of DirectorsNominees:1a.Susan Y. Kim For 1b.Kevin K. Engel For 1c.Douglas A. Alexander For 1d.Roger A. Carolin For 1e.Winston J. Churchill For 1f.Daniel Liao For 1g.MaryFrances McCourt For 1h.Robert R. Morse For 1i.Giel Rutten For 1j.Gil C. Tily For 1k.David N. Watson For 2.Advisory vote to approve the compensation of our named executive officers. For 3.Ratification of the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the year ending December 31, 2026. For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings".