| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| KIM SUSAN Y | Director, Member of 10% owner group (10), 10%+ Owner | C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI | /s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim | 2025-09-25 | 0001158922 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | AMKR | Common Stock | 4.46M | Sep 23, 2025 | Direct | ||||||
| holding | AMKR | Common Stock | 19.5M | Sep 23, 2025 | By Sujochil, LP | F1, F2, F3 | |||||
| holding | AMKR | Common Stock | 16.7M | Sep 23, 2025 | By Kim Capital Partners - KCP, LLC | F1, F2, F3 | |||||
| holding | AMKR | Common Stock | 4.42M | Sep 23, 2025 | By trusts (excl. GRATs) | F1, F2, F3 | |||||
| holding | AMKR | Common Stock | 3.79M | Sep 23, 2025 | By Sujoda Investments, LP | F1, F2, F3, F4 | |||||
| holding | AMKR | Common Stock | 3.48M | Sep 23, 2025 | By own GRATs | F1, F2, F3 | |||||
| holding | AMKR | Common Stock | 2.2M | Sep 23, 2025 | By James J. Kim 2024 GRAT dtd. 8/5/24 | F1, F2, F3 | |||||
| holding | AMKR | Common Stock | 1.6M | Sep 23, 2025 | By Agnes C. Kim 2024 GRAT dtd. 8/5/24 | F1, F2, F3 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | AMKR | Restricted Stock Units | Award | $0 | +27.4 | +0.28% | $0.00 | 9.85K | Sep 23, 2025 | Common Stock | 27.4 | Direct | F5 |
| Id | Content |
|---|---|
| F1 | 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. |
| F2 | The Reporting Person is (i) a trustee of trusts for the benefit of her immediate family members (other than grantor retained annuity trusts ("GRATs")) which own 4,418,610 shares of the Common Stock of the Issuer); (ii) a trustee of GRATs for the benefit of members of her immediate family which own 3,800,000 shares of the Issuer's Common Stock; (iii) a trustee of GRATs of which the Reporting Person was the settlor and is the sole annuitant which own 3,483,000 shares of the Issuer's Common Stock; (iv) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock |
| F3 | (Continued from Footnote 3) (v) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock and (vi) as referenced in Footnote 9, below, a member of Sujoda Management, LLC, which indirectly owns 3,789,479 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. |
| F4 | The sole general partner of Sujoda Investments, LP is Sujoda Management, LLC. The Reporting Person is one of three members of Sujoda Management, LLC. Sujoda Management, LLC is being treated as a limited partnership for purposes of Section 16, and, pursuant to the Form 4 instructions, the Reporting Person has elected to treat all of the shares of the Issuer's Common Stock owned by Sujoda Investments, LP as beneficially owned by the Reporting Person. |
| F5 | Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 23, 2025 with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc. (the "Issuer") granted to the Reporting Person on May 15, 2025. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued. |
(6) The Reporting Person states that the filing of this Form 4 shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities owned by the other members of the group, for the purpose of Section 16, or for any other purpose.