James J. Kim - 20 Jul 2026 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Reporting relationship: Member of 10% owner group (5), 10%+ Owner
Issuer ticker: AMKR
Reported as of: 20 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 22 Jul 2026, 16:32:29 UTC
Prior SEC filing: 30 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Brian D. Short, Attorney-in-Fact for James J. Kim

Key filing fact

James J. Kim filed Form 4 for AMKOR TECHNOLOGY, INC. (AMKR) on 22 Jul 2026.

Key facts

This page summarizes James J. Kim's Form 4 filing for AMKOR TECHNOLOGY, INC. (AMKR).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 22 Jul 2026, 16:32.

Change

Previous filing in this sequence was filed on 30 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001158839 Primary reporting owner

KIM JAMES J

Relationship: Member of 10% owner group (5), 10%+ Owner
Address: C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI
Signature: /s/ Brian D. Short, Attorney-in-Fact for James J. Kim
Signature date: 22 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMKR transaction

Common Stock

Options Exercise

Transaction value
Shares: +200,000
Change %: +324%
Price: $9.86^*
Shares after: 261,645
Date: 20 Jul 2026
Ownership: Direct

AMKR transaction

Common Stock

Options Exercise

Transaction value
Shares: +250,000
Change %: +96%
Price: $9.48^*
Shares after: 511,645
Date: 20 Jul 2026
Ownership: Direct

AMKR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 725,000
Date: 20 Jul 2026
Ownership: Susan Y. Kim 2023 Family Distribution Trust
Footnotes: F1, F2

AMKR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 7,828,682
Date: 20 Jul 2026
Ownership: By John T. Kim Family Trust U/A dtd. 12/11/12
Footnotes: F1, F2

AMKR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,957,350
Date: 20 Jul 2026
Ownership: By John T. Kim G-S Trust dtd. 12/11/12
Footnotes: F1, F2

AMKR holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 164,678
Date: 20 Jul 2026
Ownership: By self as Trustee of Trust U/A dtd. 12/11/12
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMKR transaction Derivative

Employee Stock Option (Right-to-Buy)

Options Exercise

Transaction value
Shares: -200,000
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 20 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 200,000
Exercise price: $9.86
Footnotes: F3

AMKR transaction Derivative

Employee Stock Option (Right-to-Buy)

Options Exercise

Transaction value
Shares: -250,000
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 20 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 250,000
Exercise price: $9.48
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The Reporting Person is (i) a trustee of trusts for the benefit of his immediate family members which own 10,511,032 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") and (ii) a trustee of a trust which is a controlling member of a limited liability company being treated as a corporation for purposes of Section 16, which limited liability company holds 164,678 shares of the Issuer's Common stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

Footnote F2

The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

Footnote F3

This stock option (the "2017 Option") to acquire 200,000 shares of the Issuer's Common Stock (the "2017 Option Shares") was granted on February 27, 2017 (the "2017 Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the 2017 Option Shares, on the first anniversary of the 2017 Option Grant Date; and (ii) with respect to the remainder of the 2017 Option Shares, in equal quarterly installments thereafter, such that 100% of the 2017 Option vested on the fourth anniversary of the 2017 Option Grant Date.

Footnote F4

This stock option (the "2019 Option") to acquire 250,000 shares of the Issuer's Common Stock (the "2019 Option Shares") was granted on February 15, 2019 (the "2019 Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the 2019 Option Shares, on the first anniversary of the 2019 Option Grant Date; and (ii) with respect to the remainder of the 2019 Option Shares, in equal quarterly installments thereafter, such that 100% of the 2019 Option vested on the fourth anniversary of the 2019 Option Grant Date.

SEC remarks

(5) The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16, or for any other purpose.