STOCK TITAN

Amkor Technology director acquires 4 dividend-linked units

Each dividend equivalent unit is subject to the same provisions as its underlying time-vested restricted stock unit.

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director and 10% owner-group member Susan Y. Kim acquired 3.9978 dividend equivalent units (DEUs) on September 22, 2026, when a dividend was paid. Each DEU represents an additional RSU and is subject to the same provisions as the time-vested RSUs granted May 13, 2026; Kim's directly held RSU balance was 2,619.5144 after the acquisition.

Positive

  • None.

Negative

  • None.
Insider KIM SUSAN Y
Role Director, 10% Owner
Type Security Shares Price Value
Grant/Award Restricted Stock Units F4 3.9978 $0.00 $0.00
holding Common Stock -- -- --
holding Common Stock F1, F2 -- -- --
holding Common Stock F1, F2 -- -- --
holding Common Stock F1, F2 -- -- --
holding Common Stock F1, F2 -- -- --
holding Common Stock F1, F2 -- -- --
holding Common Stock F1, F2 -- -- --
holding Common Stock F1, F2, F3 -- -- --
holding Common Stock F1, F2 -- -- --
Holdings After Transaction: Restricted Stock Units — 2,619.5144 contracts (Direct); Common Stock — 6,120,387 shares (Direct); Common Stock — 3,244,594 shares (Indirect, 2025 Grantor Retained Annuity Trust No. 1 of James J. Kim); Common Stock — 2,538,000 shares (Indirect, 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim); Common Stock — 1,235,000 shares (Indirect, By James J. Kim 2024 GRAT dtd. 8/5/24); Common Stock — 895,000 shares (Indirect, By Agnes C. Kim 2024 GRAT dtd. 8/5/24); Common Stock — 1,124,000 shares (Indirect, By own GRATs); Common Stock — 3,713,610 shares (Indirect, By trusts (excl. GRATs)); Common Stock — 3,789,479 shares (Indirect, By Sujoda Investments, LP); Common Stock — 19,484,809 shares (Indirect, By Sujochil, LP)
Footnotes (4)
  1. F1. 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 3,713,610 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer"), (ii) a trustee of GRATs for the benefit of members of her immediate family which own 7,912,594 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 1,124,000 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, and (v) 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.
  2. 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.
  3. F3. 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.
  4. F4. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 22, 2026 with respect to time-vested restricted stock units ("RSUs") of the Issuer granted to the Reporting Person on May 13, 2026. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.
Dividend equivalent units acquired 3.9978 units Accrued on September 22, 2026, upon payment of a dividend
Directly held RSU balance 2,619.5144 RSUs Following the acquisition on September 22, 2026
Common shares held directly 6,120,387 shares Reported as of September 22, 2026
Common shares held by family trusts other than GRATs 3,713,610 shares Reported as of September 22, 2026
Common shares held by family-benefit GRATs 7,912,594 shares Reported as of September 22, 2026
Common shares held by Susan Y. Kim's own GRATs 1,124,000 shares Reported as of September 22, 2026
Common shares held by Sujoda Investments, LP 3,789,479 shares Reported as of September 22, 2026
Common shares held by Sujochil, LP 19,484,809 shares Reported as of September 22, 2026
dividend equivalent units (DEUs) financial
"DEUs accrued upon the payment of a dividend"
restricted stock units (RSUs) financial
"time-vested restricted stock units ("RSUs")"
Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.
grantor retained annuity trusts (GRATs) financial
"grantor retained annuity trusts ("GRATs")"
pecuniary interest financial
"except to the extent of the Reporting Person's pecuniary interest therein"
beneficial ownership financial
"disclaims beneficial ownership of these securities"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many AMKR dividend equivalent units did Susan Y. Kim acquire?

Susan Y. Kim acquired 3.9978 dividend equivalent units on September 22, 2026, when a dividend was paid. Each unit represents an additional RSU subject to the same provisions as the time-vested RSUs granted May 13, 2026. Her directly held RSU balance after the acquisition was 2,619.5144.

Was Susan Y. Kim's AMKR acquisition made under a Rule 10b5-1 plan?

No Rule 10b5-1 plan is reported for the acquisition. The units accrued upon payment of a dividend on September 22, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED 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).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
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 PENNSYLVANIA 19301-9713

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
AMKOR TECHNOLOGY, INC. [ AMKR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirectorX10% Owner
Officer (give title below)XOther (specify below)
Member of 10% owner group (5)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Common Stock6,120,387D
Common Stock3,244,594(1)(2)I2025 Grantor Retained Annuity Trust No. 1 of James J. Kim
Common Stock2,538,000(1)(2)I2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim
Common Stock1,235,000(1)(2)IBy James J. Kim 2024 GRAT dtd. 8/5/24
Common Stock895,000(1)(2)IBy Agnes C. Kim 2024 GRAT dtd. 8/5/24
Common Stock1,124,000(1)(2)IBy own GRATs
Common Stock3,713,610(1)(2)IBy trusts (excl. GRATs)
Common Stock3,789,479(1)(2)(3)IBy Sujoda Investments, LP
Common Stock19,484,809(1)(2)IBy Sujochil, LP
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units$0(4)09/22/2026A3.9978 (4) (4)Common Stock3.9978$02,619.5144D
Explanation of Responses:
1. 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 3,713,610 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer"), (ii) a trustee of GRATs for the benefit of members of her immediate family which own 7,912,594 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 1,124,000 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, and (v) 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.
2. 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.
3. 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.
4. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 22, 2026 with respect to time-vested restricted stock units ("RSUs") of the Issuer granted to the Reporting Person on May 13, 2026. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.
Remarks:
5. 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.
/s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim09/24/2026
** Signature of Reporting PersonDate
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.
* Form 4: SEC 1474 (03-26)

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