SCHEDULE 13D/A 0001193125-24-233124 0001158839 XXXXXXXX LIVE 19 Common Stock, par value $0.001 per share 05/14/2025 false 0001047127 031652100 Amkor Technology, Inc.

2045 EAST INNOVATION CIRCLE TEMPE AZ 85284

James J. Kim (480) 575-7253 1500 E. Lancaster Avenue Paoli PA 19301-9713 Brian D. Short, Esq. (215) 864-8230 1735 Market Street 51st Floor Philadelphia PA 19103 0001158839 N James J. Kim a N X1 521828 0 521828 0 521828 N 0.2 IN Y James J. Kim, as Trustee a N X1 0 9786032 0 9786032 9786032 N 4.0 IN Y Agnes C. Kim a N X1 95000 0 95000 0 95000 N 0.0 IN Y John T. Kim a N X1 46972606 36360155 43624716 39708045 83332761 N 33.7 IN Y John T. Kim, as Trustee a N X1 10192233 7539500 9694001 18138764 27832765 N 11.3 IN Y David D. Kim a N X1 8746 0 8746 3347890 3356636 N 1.4 IN Y David D. Kim, as Trustee a N X1 1363400 1335113 1363400 1335113 2698513 N 1.1 IN Y Susan Y. Kim a N X1 7212373 36195477 3864483 39543367 43407850 N 17.6 IN Y Susan Y. Kim, as Trustee a N X1 13483005 7539500 13168005 8352732 21520737 N 8.7 IN Y Liam E. Blaney a N X1 0 164678 0 164678 164678 N 0.1 IN Y John T. Kim Trust of December 31, 1987 a N PA 7594001 0 7594001 0 7594001 N 3.1 OO Y Irrevocable Deed of Trust of James J. Kim for Jacqueline Mary Panichello dated 10/3/94 a N PA 0 961113 0 961113 961113 N 0.4 OO Y Irrevocable Deed of Trust of James J. Kim for Alexandra Kim Panichello dated 12/24/92 a N PA 0 961113 0 961113 961113 N 0.4 OO Y Irrevocable Deed of Trust of James J. Kim for Dylan James Panichello dated 10/15/01 a N PA 0 961113 0 961113 961113 N 0.4 OO Y Irrevocable Deed of Trust of James J. Kim for Allyson Lee Kim dated 10/15/01 a N PA 0 961113 0 961113 961113 N 0.4 OO Y Irrevocable Deed of Trust of James J. Kim FBO Jason Lee Kim dated 11/17/03 a N PA 0 961113 0 961113 961113 N 0.4 OO Y Irrevocable Deed of Trust of James J. Kim f/b/o Children of David D. Kim dated 11/11/05 a N PA 0 1335113 0 1335113 1335113 N 0.5 OO Y James J. Kim 2008 Trust FBO Alexandra Kim Panichello and Descendants dated 2/5/08 a N PA 0 546787 0 546787 546787 N 0.2 OO Y James J. Kim 2008 Trust FBO Jacqueline Mary Panichello and Descendants dated 2/5/08 a N PA 0 546787 0 546787 546787 N 0.2 OO Y James J. Kim 2008 Trust FBO Dylan James Panichello and Descendants dated 2/5/08 a N PA 0 546787 0 546787 546787 N 0.2 OO Y James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08 a N PA 0 1093574 0 1093574 1093574 N 0.4 OO Y James J. Kim 2008 Trust FBO Descendants of David D. Kim dated 2/5/08 a N PA 1363400 0 1363400 0 1363400 N 0.6 OO Y The James and Agnes Kim Foundation, Inc. a N PA 1150000 0 1150000 0 1150000 N 0.5 OO Non-profit corporation Y 915 Investments, LP a N PA 39594980 0 39594980 0 39594980 N 16.0 PN Y John T. Kim 2007 Children's Trust U/A dated 12/28/07 a N PA 315000 0 0 315000 315000 N 0.1 OO Y Sujoda Investments, LP a N PA 3347890 0 0 3347890 3347890 N 1.4 PN Y Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd 8/29/18 a N PA 0 0 0 0 0 N 0 OO Y John T. Kim 2012 Generation-Skipping Trust U/A Dated 12/11/12 a N PA 1957350 0 0 1957350 1957350 N 0.8 OO Y Family Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18 a N PA 498232 0 0 498232 498232 N 0.2 OO Y Family Trust under the John T. Kim 2012 Irrevocable Trust Agreement dated 12/11/12 a N PA 7828682 0 0 7828682 7828682 N 3.2 OO Y Family Trust under the Susan Y. Kim 2012 Irrevocable Trust Agreement dated 7/26/12 a N PA 0 0 0 0 0 N 0 OO Y Sujochil, LP a N PA 0 19484809 0 19484809 19484809 N 7.9 PN Y Qualified Annuity Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dtd 04/01/20 a N PA 0 0 0 0 0 N 0 OO Y Agnes C. Kim 2020-1 Qualified Annuity Trust U/A Dated 12/16/20 a N PA 0 0 0 0 0 N 0 OO Y Alexandra Investments, LLC a N PA 0 0 0 0 0 N 0 OO Y Jacqueline Investments, LLC a N PA 0 0 0 0 0 N 0 OO Y Dylan Investments, LLC a N PA 0 0 0 0 0 N 0 OO Y Sujoda Management, LLC N PA 3347890 0 0 3347890 3347890 N 1.4 OO Y James J. Kim 2021 Qualified Annuity Trust U/A Dated 12/15/2021 a N PA 0 0 0 0 0 N 0 OO Y Susins, LLC a N PA 0 164678 0 164678 164678 N 0.1 OO Y 2023 Grantor Retained Annuity Trust of James J. Kim dtd. 4/26/2023 a N PA 3587004 0 3587004 0 3587004 N 1.5 OO Y 2023 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 4/26/2023 a N PA 2298001 0 2298001 0 2298001 N 0.9 OO Y 2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023 a N PA 1483000 0 1483000 0 1483000 N 0.6 OO Y Kim Capital Partners - KCP, LLC a N PA 0 16710668 0 16710668 16710668 N 6.8 OO Y 2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024 a N PA 2000000 0 2000000 0 2000000 N 0.8 OO Y 2024 Grantor Retained Annuity Trust of James J. Kim dtd. 8/5/2024 a N PA 2200000 0 2200000 0 2200000 N 0.9 OO Y 2024 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 8/5/2024 a N PA 1600000 0 1600000 0 1600000 N 0.6 OO Y John T. Kim 2024 GRAT #1 dtd. 08/09/2024 a N PA 2000000 0 2000000 0 2000000 N 0.8 OO Y John T. Kim 2024 GRAT #2 dtd. 08/09/2024 a N PA 100000 0 100000 0 100000 N 0 OO Common Stock, par value $0.001 per share Amkor Technology, Inc. 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 The Schedule 13D filed with the U.S. Securities and Exchange Commission ("SEC") on November 28, 2005, as previously amended (the "Initial 13D") is hereby further amended to furnish the additional information set forth in this Amendment No. 19 to the Initial 13D. All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Initial 13D. This Amendment is being filed by the Group and separately by each of the following persons comprising the Group (each a "Reporting Person"): 1. James J. Kim 2. James J. Kim, as Trustee 3. Agnes C. Kim 4. John T. Kim 5. John T. Kim, as Trustee 6. David D. Kim 7. David D. Kim, as Trustee 8. Susan Y. Kim 9. Susan Y. Kim, as Trustee 10. Liam E. Blaney 11. John T. Kim Trust of December 31, 1987 12. Irrevocable Deed of Trust of James J. Kim for Jacqueline Mary Panichello dated 10/3/94 13. Irrevocable Deed of Trust of James J. Kim for Alexandra Kim Panichello dated 12/24/92 14. Irrevocable Deed of Trust of James J. Kim for Dylan James Panichello dated 10/15/01 15. Irrevocable Deed of Trust of James J. Kim for Allyson Lee Kim dated 10/15/01 16. Irrevocable Deed of Trust of James J. Kim FBO Jason Lee Kim dated 11/17/03 17. Irrevocable Deed of Trust of James J. Kim f/b/o Children of David D. Kim dated 11/11/05 18. James J. Kim 2008 Trust FBO Alexandra Kim Panichello and Descendants dated 2/5/08 19. James J. Kim 2008 Trust FBO Jacqueline Mary Panichello and Descendants dated 2/5/08 20. James J. Kim 2008 Trust FBO Dylan James Panichello and Descendants dated 2/5/08 21. James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08 22. James J. Kim 2008 Trust FBO Descendants of David D. Kim dated 2/5/08 23. The James and Agnes Kim Foundation, Inc. 24. 915 Investments, LP, for which John T. Kim is the sole general partner 25. John T. Kim 2007 Children's Trust UA dated 12/28/07 26. Sujoda Investments, LP, for which Sujoda Management, LLC is the sole general partner 27. Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dated 8/29/18 28. John T. Kim 2012 Generation-Skipping Trust U/A Dated 12/11/12 29. Family Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18 30. Family Trust under the John T. Kim 2012 Irrevocable Trust Agreement dated 12/11/12 31. Family Trust under the Susan Y. Kim 2012 Irrevocable Trust Agreement dated 7/26/12 32. Sujochil, LP, for which John T. Kim and Susan Y. Kim are the general partners 33. Qualified Annuity Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dtd 04/01/20 34. Agnes C. Kim 2020-1 Qualified Annuity Trust U/A Dated 12/16/20 35. Alexandra Investments, LLC, for which Susan Y. Kim and Liam E. Blaney are the managers 36. Jacqueline Investments, LLC, for which Susan Y. Kim and Liam E. Blaney are the managers 37. Dylan Investments, LLC, for which Susan Y. Kim and Liam E. Blaney are the managers 38. Sujoda Management, LLC, for which Susan Y. Kim, John T. Kim and David D. Kim are the members 39. James J. Kim 2021 Qualified Annuity Trust U/A Dated 12/15/2021 40. Susins, LLC, for which John T. Kim and Liam E. Blaney are the members 41. 2023 Grantor Retained Annuity Trust of James J. Kim dtd. 4/26/2023 42. 2023 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 4/26/2023 43. 2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023 44. Kim Capital Partners - KCP, LLC, for which Susan Y. Kim and John T. Kim are the managers 45. 2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024 46. 2024 Grantor Retained Annuity Trust of James J. Kim 8/5/2024 47. 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024 48. John T. Kim 2024 GRAT #1 dtd. 08/09/2024 49. John T. Kim 2024 GRAT #2 dtd. 08/09/2024 The principal business address for the natural persons listed above, all of whom, other than Liam E. Blaney, are members of the Kim family (the "Kim Family"), Liam E. Blaney, 915 Investments, LP ("915 Partnership"), Sujoda Investments, LP ("SI, LP"), Sujochil, LP ("Sujochil"), Sujoda Management, LLC, a Pennsylvania limited liability company, Alexandra Investments, LLC, a Pennsylvania limited liability company, Jacqueline Investments, LLC, a Pennsylvania limited liability company, Dylan Investments, LLC, a Pennsylvania limited liability company, Susins, LLC, a Pennsylvania limited liability company, Kim Capital Partners - KCP, LLC, a Pennsylvania limited liability company, for the trusts for the members of the Kim Family listed above and their descendants (as such trusts are amended, modified or supplemented from time to time, the "Kim Trusts") and for The James and Agnes Kim Foundation, Inc. (the "Foundation") is 1500 E. Lancaster Avenue, Paoli, PA 19301-9713. The present principal occupation of each natural person listed above is as follows: (i) James J. Kim - Chairman Emeritus of the Issuer; (ii) Agnes C. Kim - Homemaker; (iii) John T. Kim - Private Investor; (iv) David D. Kim - Private Investor; (v) Susan Y. Kim - Executive Chairman of the Board of the Issuer and Philanthropist; (vi) Liam E. Blaney - Kim Family Manager. The principal business of the Kim Trusts is purchasing, holding, and selling securities and other assets for investment purposes. The principal business of the Foundation is to receive contributions from donors, make investments and make grants to charitable organizations. The principal business of the 915 Partnership, SI, LP, Sujochil, Alexandra Investments, LLC, Jacqueline Investments, LLC, Dylan Investments, LLC, Susins, LLC and Kim Capital Partners - KCP, LLC is to serve as a fund through which the assets of its partners will be utilized to invest in, hold and trade in securities and other investments. The principal business of Sujoda Management, LLC is to serve as the general partner of SI, LP. N/A N/A For each Reporting Person, the response to Row 6 on the cover page, indicating the citizenship or place of organization of such person, is incorporated herein by reference. N/A N/A The response to Row 11 in each Reporting Person's cover page, indicating the aggregate number and percentage of shares of Common Stock of the Issuer beneficially owned by each Reporting Person, is incorporated herein by reference. Each Reporting Person states that the filing of this Amendment shall not be construed as an admission that such Reporting Person is, for the purposes of Section 13(d) or 13(g) of the Securities Act of 1933, as amended, the beneficial owner of the shares of Common Stock reported as beneficially owned by the other Reporting Persons in this Amendment. The total number of shares which are beneficially owned by the members of the Group as a group is 132,672,101 shares, or approximately 53.7% of the outstanding shares of the Issuer's Common Stock. The number of shares beneficially owned by the Group includes 570,000 shares which may be acquired pursuant to options that are exercisable within sixty (60) days of May 14, 2025. The ownership percentages were calculated based on 247,056,288 outstanding shares of Common Stock of the Issuer as of April 22, 2025 according to the Issuer's Form 10-Q filed on April 29, 2025. Beneficial ownership was increased, as appropriate, to include the shares beneficially owned by each Reporting Person that may be acquired pursuant to options exercisable within sixty (60) days of May 14, 2025. The responses of each Reporting Person to Rows 7 through 10 on the cover page of this Amendment are incorporated herein by reference. N/A N/A N/A On October 2, 2024, 915 Investments, LP, a Pennsylvania limited partnership (the "Borrower") entered into a secured margin line of credit note (the "Note") with JPMorgan Chase Bank, N.A. (the "Bank" and collectively with the Borrower, the "Parties"). This Note was disclosed on Amendment No. 18 to the Initial 13D filed by the by the Reporting Persons on October 4, 2024 ("Amendment 18"). Neither Amkor Technology, Inc., a Delaware corporation (the "Issuer") nor any of its subsidiaries is a party to the Note. The obligations under the Note are guaranteed by Susan Y. Kim and Susan Y. Kim, as trustee of the Susan Y. Kim Trust of December 31, 1987, as amended and restated (the "SYK 2007 Trust"). The Guaranty Agreement, dated as of October 2, 2024, by and among the Bank, Susan Y. Kim and the SYK 2007 Trust was filed as Exhibit 99.2 to Amendment No. 18 and is incorporated herein by reference. On May 14, 2025, in connection with the Borrower paying down a portion of the obligations under the Note, the Parties amended the Note to reduce the aggregate principal amount of the loans that may be made by the Bank to the Borrower from $350 million to $250 million. All other material provisions of the Note and Guaranty previously disclosed on Amendment No. 18 remain substantially the same. Exhibit 99.1 Nineteenth Amended and Restated Agreement regarding joint filing (filed herewith) Exhibit 99.2 Guaranty Agreement, dated October 2, 2024, among Susan Y. Kim and Susan Y. Kim, as Trustee of the Susan Y. Kim Trust of December 31, 1987 in favor of JPMorgan Chase Bank, N.A. (incorporated by reference to Exhibit 99.2 to the Schedule 13D/A filed by the Reporting Persons on October 4, 2024). Exhibit 24.1 Powers of Attorney (incorporated by reference to Exhibit 24 to the Schedule 13D/A filed by the Reporting Persons on October 4, 2024) James J. Kim /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 James J. Kim, as Trustee /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Agnes C. Kim /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim, as Trustee /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 David D. Kim /s/ Kenneth R. Hillier, Attorney in Fact 05/16/2025 David D. Kim, as Trustee /s/ Kenneth R. Hillier, Attorney in Fact 05/16/2025 Susan Y. Kim /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Susan Y. Kim, as Trustee /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Liam E. Blaney /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim Trust of December 31, 1987 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Irrevocable Deed of Trust of James J. Kim for Jacqueline Mary Panichello dated 10/3/94 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Irrevocable Deed of Trust of James J. Kim for Alexandra Kim Panichello dated 12/24/92 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Irrevocable Deed of Trust of James J. Kim for Dylan James Panichello dated 10/15/01 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Irrevocable Deed of Trust of James J. Kim for Allyson Lee Kim dated 10/15/01 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Irrevocable Deed of Trust of James J. Kim FBO Jason Lee Kim dated 11/17/03 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Irrevocable Deed of Trust of James J. Kim f/b/o Children of David D. Kim dated 11/11/05 /s/ Kenneth R. Hillier, Attorney in Fact 05/16/2025 James J. Kim 2008 Trust FBO Alexandra Kim Panichello and Descendants dated 2/5/08 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 James J. Kim 2008 Trust FBO Jacqueline Mary Panichello and Descendants dated 2/5/08 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 James J. Kim 2008 Trust FBO Dylan James Panichello and Descendants dated 2/5/08 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 James J. Kim 2008 Trust FBO Descendants of David D. Kim dated 2/5/08 /s/ Kenneth R. Hillier, Attorney in Fact 05/16/2025 The James and Agnes Kim Foundation, Inc. /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 915 Investments, LP /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim 2007 Children's Trust U/A dated 12/28/07 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Sujoda Investments, LP /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd 8/29/18 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim 2012 Generation-Skipping Trust U/A Dated 12/11/12 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Family Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Family Trust under the John T. Kim 2012 Irrevocable Trust Agreement dated 12/11/12 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Family Trust under the Susan Y. Kim 2012 Irrevocable Trust Agreement dated 7/26/12 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Sujochil, LP /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Qualified Annuity Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dtd 04/01/20 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Agnes C. Kim 2020-1 Qualified Annuity Trust U/A Dated 12/16/20 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Alexandra Investments, LLC /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Jacqueline Investments, LLC /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Dylan Investments, LLC /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Sujoda Management, LLC /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 James J. Kim 2021 Qualified Annuity Trust U/A Dated 12/15/2021 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Susins, LLC /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 2023 Grantor Retained Annuity Trust of James J. Kim dtd. 4/26/2023 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 2023 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 4/26/2023 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 Kim Capital Partners - KCP, LLC /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 2024 Grantor Retained Annuity Trust of James J. Kim dtd. 8/5/2024 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 2024 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 8/5/2024 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim 2024 GRAT #1 dtd. 08/09/2024 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025 John T. Kim 2024 GRAT #2 dtd. 08/09/2024 /s/ Brian D. Short, Attorney-in-Fact 05/16/2025