STOCK TITAN

[Form 4] AMKOR TECHNOLOGY, INC. Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
4

Susan Y. Kim, a director and reported 10% owner of Amkor Technology, Inc. (AMKR), filed a Form 4 disclosing a disposition of 4,456,494 shares on 09/23/2025. The filing details numerous indirect holdings through entities and trusts for which she serves as trustee, general partner or manager, including 19,484,809 shares held by Sujochil, LP, 16,710,668 shares held by an LLC treated as a corporation, 4,418,610 shares held by family trusts (excluding GRATs), 3,800,000 shares held by GRATs, 3,483,000 shares held by GRATs of which she was settlor, and 3,789,479 shares indirectly owned via Sujoda Investments, LP. The filer disclaims beneficial ownership except for her pecuniary interest. The filing also reports dividend equivalent units accrued on 09/23/2025 related to time-vested RSUs granted 05/15/2025.

Susan Y. Kim, direttrice e riportata proprietaria del 10% di Amkor Technology, Inc. (AMKR), ha presentato un modulo Form 4 divulga una disposizione di 4.456.494 azioni il 23/09/2025. La denuncia dettaglia numerose partecipazioni indirette tramite entità e trust di cui è fiduciaria, socia generale o direttrice, tra cui 19.484.809 azioni detenute da Sujochil, LP, 16.710.668 azioni detenute da una LLC trattata come una società, 4.418.610 azioni detenute da trust familiari (escludendo GRAT), 3.800.000 azioni detenute da GRAT, 3.483.000 azioni detenute da GRAT di cui era fondatrice, e 3.789.479 azioni indirettamente possedute tramite Sujoda Investments, LP. La dichiarante nega la proprietà benefica ad eccezione del proprio interesse pecuniario. L’atto riporta anche unità di dividendi equivalenti maturate il 23/09/2025 relative a RSU a vesting temporaneo concesso il 15/05/2025.

Susan Y. Kim, directora y reportada propietaria del 10% de Amkor Technology, Inc. (AMKR), presentó un Formulario 4 divulgando una disposición de 4,456,494 acciones el 23/09/2025. La presentación detalla numerosas participaciones indirectas a través de entidades y fideicomisos en los que ella actúa como fideicomitente, socia general o gerente, incluyendo 19,484,809 acciones en Sujochil, LP, 16,710,668 acciones en una LLC tratada como corporación, 4,418,610 acciones en fideicomisos familiares (excluyendo GRATs), 3,800,000 acciones en GRATs, 3,483,000 acciones en GRATs de los que fue fundadora, y 3,789,479 acciones poseídas indirectamente a través de Sujoda Investments, LP. La solicitante niega la propiedad beneficiosa salvo por su interés pecuniario. El formulario también reporta unidades de dividendos equivalentes acumuladas el 23/09/2025 relacionadas con RSU concedidas a vesting por tiempo el 15/05/2025.

수잔 Y. 킴은 Amkor Technology, Inc. (AMKR)의 이사이자 10% 소유자로 보고되며 2025년 9월 23일 Form 4를 제출하여 4,456,494주를 처분했다고 공시했습니다. 보고서는 그녀가 수탁자, 일반 파트너 또는 매니저로 활동하는 여러 간접 보유를 엔티티와 트러스트를 통해 상세히 설명하며, 수조칠, LP가 보유한 19,484,809주, 기업으로 취급되는 LLC가 보유한 16,710,668주, 가족 트러스트( GRAT 제외) 보유 4,418,610주, GRAT 보유 3,800,000주, 그녀가 설립자인 GRAT 보유 3,483,000주, Sujo다 Investments, LP를 통해 간접 소유한 3,789,479주를 포함합니다. 제출자는 재산적 이해관계 외에 유익 소유권을 부인합니다. 또한 2025-09-23에 누적된 시간제 RSU 부여와 관련된 배당 등가 단위도 보고합니다.

Susan Y. Kim, directrice et propriétaire déclarée à hauteur de 10% d'Amkor Technology, Inc. (AMKR), a déposé un Form 4 divulguant une cession de 4 456 494 actions le 23/09/2025. Le dépôt détaille de nombreuses participations indirectes via des entités et des trusts dont elle est fiduciaire, associée générale ou gérante, dont 19 484 809 actions détenues par Sujochil, LP, 16 710 668 actions détenues par une LLC traitée comme une société, 4 418 610 actions détenues par des trusts familiaux (à l'exclusion des GRAT), 3 800 000 d'actions détenues par des GRAT, 3 483 000 d'actions détenues par des GRAT dont elle était fondatrice, et 3 789 479 d'actions détenues indirectement via Sujoda Investments, LP. La déclarant refuse la propriété bénéficiaire à l'exception de son intérêt pécuniaire. La déclaration mentionne également des unités équivalentes à des dividendes accumulées au 23/09/2025 liées à des RSU accordées à vesting temporel le 15/05/2025.

Susan Y. Kim, Direktorin und gemeldete 10%-Eigentümerin von Amkor Technology, Inc. (AMKR), reichte am 23.09.2025 ein Form 4 ein und machte eine Veräußerung von 4.456.494 Aktien bekannt. Die Einreichung erläutert zahlreiche indirekte Beteiligungen durch Unternehmen und Trusts, in denen sie als Treuhänderin, Generalpartnerin oder Geschäftsführerin fungiert, darunter 19.484.809 Aktien, gehalten von Sujochil, LP, 16.710.668 Aktien, gehalten von einer LLC, die wie eine Kapitalgesellschaft behandelt wird, 4.418.610 Aktien, gehalten von Familien-Trusts (ausgenommen GRATs), 3.800.000 Aktien, gehalten von GRATs, 3.483.000 Aktien, gehalten von GRATs, deren Settlor sie war, und 3.789.479 Aktien, indirekt über Sujoda Investments, LP. Die Einreichende bestreitet eine wirtschaftliche Eigentümerschaft außer ihrem finanziellen Interesse. Die Einreichung meldet außerdem Dividendenäquivalenteinheiten, die am 23.09.2025 im Zusammenhang mit zeitbasierten RSUs gewährt wurden, die am 15.05.2025 vergeben wurden.

سوزان واي. كيم، مديرة ومعلنة كمالكة بنسبة 10% لشركة Amkor Technology, Inc. (AMKR)، قدمت نموذج 4 كاشفة عن تصرف في 4,456,494 سهماً في 23/09/2025. يحوي الإيداع تفاصيل لامتيازات غير مباشرة عبر كيانات وصناديق أمانة تشغلها كمفوضة أمينة أو شريكة عامة أو مديره، بما فيها 19,484,809 سهماً مملوكة لـ Sujochil, LP، 16,710,668 سهماً مملوكة من LLC تُعامل كشركة، 4,418,610 سهماً مملوكة لصناديق عائلية (باستثناء GRAT)، 3,800,000 سهماً مملوكة لـ GRAT، 3,483,000 سهماً مملوكاً لـ GRAT التي كانت هي المؤسسة لها، و 3,789,479 سهماً مملوكاً بشكل غير مباشر عبر Sujoda Investments, LP. تنفي المعلنة الملكية المفيدة باستثناء مصلحتها المالية. كما يورد الإيداع وحدات مكافئة لأرباح مكدسة حتى 23/09/2025 مرتبطة ب RSUs تُمنح بواقع vesting زمني في 15/05/2025.

苏珊 Y. 金,任职董事并据报为 Amkor Technology, Inc.(AMKR)的10%所有者,提交了 Form 4,披露在 2025-09-23 的 4,456,494 股处置。该申报通过她担任受托人、普通合伙人或经理的实体和信托,详细列出多项间接持有,包括 Sujochil, LP 持有的 19,484,809 股被视为公司处理的 LLC 持有的 16,710,668 股家族信托持有的 4,418,610 股(不含 GRAT) GRAT 持有的 3,800,000 股 GRAT 由她设立的 3,483,000 股、以及 通过 Sujoda Investments, LP 间接持有的 3,789,479 股。申报人对受益所有权表示除其经济利益外不享有受益所有权。申报还报告于 2025-09-23 产生的与按时间归属的 RSU 授予相关的股息等价单位。

Positive
  • Detailed disclosure of indirect holdings and roles (trustee, general partner, manager) enhances transparency
  • Accrual of dividend equivalent units on RSUs is explicitly reported, clarifying compensation-related movements
Negative
  • Material disposition of 4,456,494 shares on 09/23/2025 by a director and 10% owner
  • Concentrated indirect ownership across multiple entities (e.g., 19,484,809 shares via Sujochil, LP) which could be material to shareholders

Insights

TL;DR: A material insider sale of 4.46 million shares by a director and 10% owner is disclosed; significant indirect holdings remain concentrated.

The Form 4 shows a large, explicit disposition of 4,456,494 shares on 09/23/2025 by Susan Y. Kim while she continues to hold substantial indirect positions through multiple entities and trusts, including a 19.5 million share position via Sujochil, LP and a 16.7 million share position via a manager-controlled LLC. The filing follows Section 16 disclosure norms and includes accrual of dividend equivalent units for RSUs granted 05/15/2025. For investors, the combination of a sizable sale and continued concentrated indirect ownership is material information for assessing insider activity and potential liquidity events.

TL;DR: Disclosure is comprehensive about indirect ownership and includes customary disclaimers of beneficial ownership.

The submission provides detailed footnotes describing trustee, general partner and manager roles that explain why the Reporting Person is treated as having pecuniary interests in multiple large holdings. The filing expressly disclaims beneficial ownership except to the extent of pecuniary interest and documents dividend equivalent units tied to RSUs. The level of detail supports transparency under Section 16, though the simultaneous large disposition and extensive indirect holdings warrant attention from governance and compliance perspectives.

Susan Y. Kim, direttrice e riportata proprietaria del 10% di Amkor Technology, Inc. (AMKR), ha presentato un modulo Form 4 divulga una disposizione di 4.456.494 azioni il 23/09/2025. La denuncia dettaglia numerose partecipazioni indirette tramite entità e trust di cui è fiduciaria, socia generale o direttrice, tra cui 19.484.809 azioni detenute da Sujochil, LP, 16.710.668 azioni detenute da una LLC trattata come una società, 4.418.610 azioni detenute da trust familiari (escludendo GRAT), 3.800.000 azioni detenute da GRAT, 3.483.000 azioni detenute da GRAT di cui era fondatrice, e 3.789.479 azioni indirettamente possedute tramite Sujoda Investments, LP. La dichiarante nega la proprietà benefica ad eccezione del proprio interesse pecuniario. L’atto riporta anche unità di dividendi equivalenti maturate il 23/09/2025 relative a RSU a vesting temporaneo concesso il 15/05/2025.

Susan Y. Kim, directora y reportada propietaria del 10% de Amkor Technology, Inc. (AMKR), presentó un Formulario 4 divulgando una disposición de 4,456,494 acciones el 23/09/2025. La presentación detalla numerosas participaciones indirectas a través de entidades y fideicomisos en los que ella actúa como fideicomitente, socia general o gerente, incluyendo 19,484,809 acciones en Sujochil, LP, 16,710,668 acciones en una LLC tratada como corporación, 4,418,610 acciones en fideicomisos familiares (excluyendo GRATs), 3,800,000 acciones en GRATs, 3,483,000 acciones en GRATs de los que fue fundadora, y 3,789,479 acciones poseídas indirectamente a través de Sujoda Investments, LP. La solicitante niega la propiedad beneficiosa salvo por su interés pecuniario. El formulario también reporta unidades de dividendos equivalentes acumuladas el 23/09/2025 relacionadas con RSU concedidas a vesting por tiempo el 15/05/2025.

수잔 Y. 킴은 Amkor Technology, Inc. (AMKR)의 이사이자 10% 소유자로 보고되며 2025년 9월 23일 Form 4를 제출하여 4,456,494주를 처분했다고 공시했습니다. 보고서는 그녀가 수탁자, 일반 파트너 또는 매니저로 활동하는 여러 간접 보유를 엔티티와 트러스트를 통해 상세히 설명하며, 수조칠, LP가 보유한 19,484,809주, 기업으로 취급되는 LLC가 보유한 16,710,668주, 가족 트러스트( GRAT 제외) 보유 4,418,610주, GRAT 보유 3,800,000주, 그녀가 설립자인 GRAT 보유 3,483,000주, Sujo다 Investments, LP를 통해 간접 소유한 3,789,479주를 포함합니다. 제출자는 재산적 이해관계 외에 유익 소유권을 부인합니다. 또한 2025-09-23에 누적된 시간제 RSU 부여와 관련된 배당 등가 단위도 보고합니다.

Susan Y. Kim, directrice et propriétaire déclarée à hauteur de 10% d'Amkor Technology, Inc. (AMKR), a déposé un Form 4 divulguant une cession de 4 456 494 actions le 23/09/2025. Le dépôt détaille de nombreuses participations indirectes via des entités et des trusts dont elle est fiduciaire, associée générale ou gérante, dont 19 484 809 actions détenues par Sujochil, LP, 16 710 668 actions détenues par une LLC traitée comme une société, 4 418 610 actions détenues par des trusts familiaux (à l'exclusion des GRAT), 3 800 000 d'actions détenues par des GRAT, 3 483 000 d'actions détenues par des GRAT dont elle était fondatrice, et 3 789 479 d'actions détenues indirectement via Sujoda Investments, LP. La déclarant refuse la propriété bénéficiaire à l'exception de son intérêt pécuniaire. La déclaration mentionne également des unités équivalentes à des dividendes accumulées au 23/09/2025 liées à des RSU accordées à vesting temporel le 15/05/2025.

Susan Y. Kim, Direktorin und gemeldete 10%-Eigentümerin von Amkor Technology, Inc. (AMKR), reichte am 23.09.2025 ein Form 4 ein und machte eine Veräußerung von 4.456.494 Aktien bekannt. Die Einreichung erläutert zahlreiche indirekte Beteiligungen durch Unternehmen und Trusts, in denen sie als Treuhänderin, Generalpartnerin oder Geschäftsführerin fungiert, darunter 19.484.809 Aktien, gehalten von Sujochil, LP, 16.710.668 Aktien, gehalten von einer LLC, die wie eine Kapitalgesellschaft behandelt wird, 4.418.610 Aktien, gehalten von Familien-Trusts (ausgenommen GRATs), 3.800.000 Aktien, gehalten von GRATs, 3.483.000 Aktien, gehalten von GRATs, deren Settlor sie war, und 3.789.479 Aktien, indirekt über Sujoda Investments, LP. Die Einreichende bestreitet eine wirtschaftliche Eigentümerschaft außer ihrem finanziellen Interesse. Die Einreichung meldet außerdem Dividendenäquivalenteinheiten, die am 23.09.2025 im Zusammenhang mit zeitbasierten RSUs gewährt wurden, die am 15.05.2025 vergeben wurden.

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
KIM SUSAN Y

(Last) (First) (Middle)
C/O SIANA CARR O'CONNOR & LYNAM
1500 EAST LANCASTER AVENUE

(Street)
PAOLI PA 19301-9713

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
AMKOR TECHNOLOGY, INC. [ AMKR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director X 10% Owner
Officer (give title below) X Other (specify below)
Member of 10% owner group (10)
3. Date of Earliest Transaction (Month/Day/Year)
09/23/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 4,456,494 D
Common Stock 19,484,809(1)(2)(3) I By Sujochil, LP
Common Stock 16,710,668(1)(2)(3) I By Kim Capital Partners - KCP, LLC
Common Stock 4,418,610(1)(2)(3) I By trusts (excl. GRATs)
Common Stock 3,789,479(1)(2)(3)(4) I By Sujoda Investments, LP
Common Stock 3,483,000(1)(2)(3) I By own GRATs
Common Stock 2,200,000(1)(2)(3) I By James J. Kim 2024 GRAT dtd. 8/5/24
Common Stock 1,600,000(1)(2)(3) I By Agnes C. Kim 2024 GRAT dtd. 8/5/24
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (5) 09/23/2025 A 27.3648 (5) (5) Common Stock 27.3648 $0 9,854.8917 D
Explanation of Responses:
1. 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.
2. 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
3. (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.
4. 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.
5. 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.
Remarks:
(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.
/s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim 09/25/2025
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Susan Y. Kim report on Form 4 for AMKR?

She reported a disposition of 4,456,494 shares on 09/23/2025 and detailed multiple indirect holdings through entities and trusts.

How many shares does Sujochil, LP hold according to the filing?

Sujochil, LP is reported to own 19,484,809 shares of Amkor Technology, Inc.

Does the filing show any RSU or dividend-equivalent activity for AMKR?

Yes. The filing reports dividend equivalent units accrued on 09/23/2025 related to time-vested RSUs granted on 05/15/2025.

Does Susan Y. Kim claim direct beneficial ownership of all reported shares?

No. The Reporting Person disclaims beneficial ownership except to the extent of her pecuniary interest and explains holdings arise from trustee, partner or manager roles.

What indirect holdings are disclosed in the Form 4?

Key indirect holdings include: 19,484,809 shares (Sujochil, LP), 16,710,668 shares (manager-controlled LLC), 4,418,610 shares (family trusts excluding GRATs), 3,800,000 shares (GRATs), 3,483,000 shares (GRATs where she was settlor), and 3,789,479 shares (Sujoda Investments, LP).
Amkor Tech

NASDAQ:AMKR

AMKR Rankings

AMKR Latest News

AMKR Latest SEC Filings

AMKR Stock Data

7.17B
110.24M
55.4%
46.83%
2.3%
Semiconductor Equipment & Materials
Semiconductors & Related Devices
Link
United States
TEMPE