STOCK TITAN

Amkor (NASDAQ: AMKR) director Susan Y. Kim receives dividend-based RSU grant

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

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director and 10% owner group member Susan Y. Kim reported an acquisition of restricted stock units tied to a dividend. She received 18.1563 dividend equivalent restricted stock units on March 31, 2026, increasing her restricted stock unit holdings to 9,893.0573 units of common stock.

The filing also lists substantial common stock holdings reported as direct and indirect interests through various family trusts, grantor retained annuity trusts, and limited partnerships, with beneficial ownership treated based on her pecuniary interest in those entities.

Positive

  • None.

Negative

  • None.

Insights

Filing shows a small routine equity award and large existing holdings.

The Form 4 for AMKOR TECHNOLOGY, INC. reports that Susan Y. Kim received 18.1563 restricted stock units as dividend equivalent units on March 31, 2026. These units mirror cash dividends on existing awards and are standard for time-vested RSUs.

After this grant, she holds 9,893.0573 restricted stock units and significant common stock positions, both directly and via trusts and partnerships. The filing clarifies her roles as trustee and general partner and notes beneficial ownership is reported based on her pecuniary interest, making this primarily a routine compensation and disclosure update.

Insider KIM SUSAN Y
Role Director, 10% Owner
Type Security Shares Price Value
Grant/Award Restricted Stock Units 18.156 $0.00 --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Units — 9,893.057 shares (Direct); Common Stock — 0 shares (Indirect, By Kim Capital Partners - KCP, LLC); Common Stock — 6,090,494 shares (Direct)
Footnotes (1)
  1. The Reporting Person resigned as a manager of Kim Capital Partners - KCP, LLC on April 1, 2026. 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. 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. 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. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on March 31, 2026 with respect to time-vested restricted stock units ("RSUs") of 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.
RSU dividend equivalents granted 18.1563 units Restricted stock units credited on March 31, 2026
RSUs following transaction 9,893.0573 units Total restricted stock units held after March 31, 2026 grant
Direct common stock holding 6,090,494 shares Common stock reported as directly held
Sujochil, LP holding 19,484,809 shares Common stock owned by Sujochil, LP where she is general partner
Sujoda Investments, LP holding 3,789,479 shares Common stock owned by Sujoda Investments, LP
Trusts (excluding GRATs) holding 3,713,610 shares Common stock held by family trusts excluding GRATs
Family GRATs holding 7,912,594 shares Common stock held by GRATs for immediate family members
Own GRATs holding 1,124,000 shares Common stock held by GRATs where she is settlor and sole annuitant
Restricted Stock Units financial
"Restricted Stock Units of the Issuer granted to the Reporting Person"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
Dividend equivalent units financial
"Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend"
Grantor Retained Annuity Trusts financial
"grantor retained annuity trusts ("GRATs") which own shares of the Issuer's Common Stock"
A grantor retained annuity trust (GRAT) is an estate-planning tool where an owner transfers assets into a trust and receives fixed payments back for a set number of years; any remaining assets after that period pass to designated beneficiaries. For investors it matters because it can move future investment growth to heirs while potentially reducing gift and estate taxes — like putting a rising asset in a timed box that pays you first and gives the remaining upside to others.
pecuniary interest financial
"treated as having a pecuniary interest in all of such shares"
Section 16 regulatory
"for purposes of Section 16 of the Securities Exchange Act of 1934"
Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.
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 (6)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
03/31/2026
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 Stock0(1)IBy Kim Capital Partners - KCP, LLC
Common Stock6,090,494D
Common Stock3,244,594(2)(3)I2025 Grantor Retained Annuity Trust No. 1 of James J. Kim
Common Stock2,538,000(2)(3)I2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim
Common Stock1,235,000(2)(3)IBy James J. Kim 2024 GRAT dtd. 8/5/24
Common Stock895,000(2)(3)IBy Agnes C. Kim 2024 GRAT dtd. 8/5/24
Common Stock1,124,000(2)(3)IBy own GRATs
Common Stock3,713,610(2)(3)IBy trusts (excl. GRATs)
Common Stock3,789,479(2)(3)(4)IBy Sujoda Investments, LP
Common Stock19,484,809(2)(3)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(5)03/31/2026A18.1563 (5) (5)Common Stock18.1563$09,893.0573D
Explanation of Responses:
1. The Reporting Person resigned as a manager of Kim Capital Partners - KCP, LLC on April 1, 2026.
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 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.
3. 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.
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 March 31, 2026 with respect to time-vested restricted stock units ("RSUs") of 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. Kim04/02/2026
** 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)

FAQ

What did Susan Y. Kim acquire in this AMKR Form 4 filing?

Susan Y. Kim acquired 18.1563 restricted stock units in Amkor Technology as dividend equivalent units. These units were credited on March 31, 2026 in connection with a dividend, and are subject to the same terms as her existing time-vested restricted stock units granted in 2025.

How many restricted stock units does Susan Y. Kim hold after this AMKR transaction?

After the March 31, 2026 grant, Susan Y. Kim holds 9,893.0573 restricted stock units of Amkor Technology common stock. These units represent equity-based compensation that typically vests over time and may convert into shares in the future under the original award terms.

Does this AMKR Form 4 show any open market stock purchases or sales?

The Form 4 for Amkor Technology does not show any open market purchases or sales. It reports a grant of 18.1563 restricted stock units as dividend equivalents and updates share amounts held directly and indirectly through family trusts and partnerships associated with Susan Y. Kim.

What indirect Amkor Technology holdings are reported for Susan Y. Kim?

Indirect holdings include Amkor Technology shares held through various family trusts, grantor retained annuity trusts, and limited partnerships such as Sujochil, LP and Sujoda Investments, LP, where she has trustee or general partner roles and a pecuniary interest disclosed in the Form 4 footnotes.

Why are dividend equivalent units (DEUs) mentioned in the AMKR Form 4?

Dividend equivalent units are mentioned because a cash dividend on March 31, 2026 generated 18.1563 new restricted stock units for Susan Y. Kim. Each DEU represents an additional RSU that follows the same vesting and other terms as the original May 15, 2025 RSU grant.

How does the AMKR Form 4 describe Susan Y. Kim’s beneficial ownership?

The Form 4 explains that Susan Y. Kim is treated as having a pecuniary interest in shares held by certain trusts and partnerships. It also states she disclaims beneficial ownership beyond her pecuniary interest, clarifying how Section 16 reporting applies to these indirect Amkor Technology holdings.