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person · Reporting owner

KIM SUSAN Y

Disclosed activity across 1 company

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35459
SEC CIK
0001158922

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
AMKOR TECHNOLOGY, INC.AMKR · Entity 3481Director · 10% owner · Member of 10% owner group (5)September 22, 2026September 24, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

AMKOR TECHNOLOGY, INC.

Report date September 22, 2026 · Filed September 24, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Restricted Stock UnitsSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct2,619.5144 Reported balance After 2026-09-22 transaction · row 10 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 10 · 2026-09-22 · Grant · Acquired 3.9978 · Balance 2,619.5144

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.

Common StockSEC Table I · non-derivativeDirect6,120,387 Reported balance Holding disclosure · report date 2026-09-22 · row 1 Holding and transaction disclosures are not merged.
1 source row

Row 1 · Balance 6,120,387

Common StockSEC Table I · non-derivativeIndirect2025 Grantor Retained Annuity Trust No. 1 of James J. Kim3,244,594 Reported balance Holding disclosure · report date 2026-09-22 · row 2 Holding and transaction disclosures are not merged.
1 source row

Row 2 · Balance 3,244,594

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.

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.

Common StockSEC Table I · non-derivativeIndirect2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim2,538,000 Reported balance Holding disclosure · report date 2026-09-22 · row 3 Holding and transaction disclosures are not merged.
1 source row

Row 3 · Balance 2,538,000

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.

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.

Common StockSEC Table I · non-derivativeIndirectBy James J. Kim 2024 GRAT dtd. 8/5/241,235,000 Reported balance Holding disclosure · report date 2026-09-22 · row 4 Holding and transaction disclosures are not merged.
1 source row

Row 4 · Balance 1,235,000

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.

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.

Common StockSEC Table I · non-derivativeIndirectBy Agnes C. Kim 2024 GRAT dtd. 8/5/24895,000 Reported balance Holding disclosure · report date 2026-09-22 · row 5 Holding and transaction disclosures are not merged.
1 source row

Row 5 · Balance 895,000

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.

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.

Common StockSEC Table I · non-derivativeIndirectBy own GRATs1,124,000 Reported balance Holding disclosure · report date 2026-09-22 · row 6 Holding and transaction disclosures are not merged.
1 source row

Row 6 · Balance 1,124,000

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.

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.

Common StockSEC Table I · non-derivativeIndirectBy trusts (excl. GRATs)3,713,610 Reported balance Holding disclosure · report date 2026-09-22 · row 7 Holding and transaction disclosures are not merged.
1 source row

Row 7 · Balance 3,713,610

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.

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.

Common StockSEC Table I · non-derivativeIndirectBy Sujoda Investments, LP3,789,479 Reported balance Holding disclosure · report date 2026-09-22 · row 8 Holding and transaction disclosures are not merged.
1 source row

Row 8 · Balance 3,789,479

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.

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.

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.

Common StockSEC Table I · non-derivativeIndirectBy Sujochil, LP19,484,809 Reported balance Holding disclosure · report date 2026-09-22 · row 9 Holding and transaction disclosures are not merged.
1 source row

Row 9 · Balance 19,484,809

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.

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.

Filing footnotes · ownership attribution and instrument terms

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.

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.

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.

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.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
September 11, 2017 Filed Feb 14, 2018 17:52 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 686,108 $9.06 $6,216,138.48
Disclosure

SEC source: 0000899243-18-003808 · doc5.xml · nonDerivative · entry 4

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 32,166,663

F3 · kind: On September 11, 2017, the James J. Kim 2013 Qualified Annuity Trust U/A Dated 5/17/13 distributed 686,108 shares of the Company's Common Stock to James J. Kim. James J. Kim and Susan Y. Kim are co-trustees.

F5 · balance_after: 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, or for any other purpose.

Read SEC document
August 11, 2017 Filed Feb 14, 2018 17:52 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 480,540 $8.63 $4,147,060.20
Disclosure

SEC source: 0000899243-18-003808 · doc5.xml · nonDerivative · entry 3

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,804,501

F2 · kind: On August 11, 2017, the Susan Y. Kim 2015 Irrevocable Trust U/A Dated March 16, 2015 distributed 480,540 shares of the Company's Common Stock to Susan Y. Kim. Susan Y. Kim and John T. Kim are co-trustees.

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August 11, 2017 Filed Feb 14, 2018 17:52 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 480,540 $8.63 $4,147,060.20
Disclosure

SEC source: 0000899243-18-003808 · doc5.xml · nonDerivative · entry 2

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 32,166,663

F2 · kind: On August 11, 2017, the Susan Y. Kim 2015 Irrevocable Trust U/A Dated March 16, 2015 distributed 480,540 shares of the Company's Common Stock to Susan Y. Kim. Susan Y. Kim and John T. Kim are co-trustees.

F5 · balance_after: 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, or for any other purpose.

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May 02, 2017 Filed May 5, 2017 00:56 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 GrantDirector Stock Option (Right to Buy) · Derivative 20,000 $0.00 Strike: $11.71 $0.00
Disclosure

SEC source: 0001209191-17-030166 · doc4.xml · derivative · entry 5

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Amkor Technology Inc. Common Stock · 20,000 shares

Expires 2027-05-02

F3 · derivative.exercise_date: These options vest 100% on the earlier of the first anniversary of the grant date, or the date of the first annual meeting of stockholders following the grant date

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May 02, 2017 Filed May 5, 2017 00:56 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 GrantCommon Stock 3,415 $0.00 $0.00
Disclosure

SEC source: 0001209191-17-030166 · doc4.xml · nonDerivative · entry 2

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,932,381

F1 · shares: These are restricted shares which vest 100% on the earlier of the first anniversary of the grant date, or the date of the first annual meeting of stockholders following the grant date

F2 · balance_after: 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, or for any other purpose.

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February 22, 2017 Filed Feb 14, 2018 17:52 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 53,105 $10.25 $544,326.25
Disclosure

SEC source: 0000899243-18-003808 · doc5.xml · nonDerivative · entry 1

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 32,166,663

F1 · kind: On February 22, 2017, the James J. Kim 2014 Qualified Annuity Trust U/A dated October 13, 2014 distributed 53,105 shares to James J. Kim. James J. Kim and Susan Y. Kim are co- trustees of the trust.

F5 · balance_after: 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, or for any other purpose.

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January 12, 2017 Filed Jan 17, 2017 21:35 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 PurchaseCommon Stock 19,484,809 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-17-001328 · doc4.xml · nonDerivative · entry 1

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · See Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as general partner

Disclosed balance after: 19,484,809

F1 · security: On January 12, 2017, the David D. Kim Trust of 12/31/87 sold 19,484,809 shares of the Company's Common Stock to a newly created Pennsylvania limited partnership, Sujochil, LP (the "Partnership"), at a price of $10.8984 per share. Susan Y. Kim and John T. Kim are general partners of the Partnership. The limited partners of the Partnership are John T. Kim, Susan Y. Kim, two irrevocable trusts created by Susan Y. Kim for her descendants and two irrevocable trusts created by John T. Kim for his descendants. Susan Y. Kim and John T. Kim are the co-trustees of all four trusts.

F2 · security: 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, or for any other purpose.

F1 · kind: On January 12, 2017, the David D. Kim Trust of 12/31/87 sold 19,484,809 shares of the Company's Common Stock to a newly created Pennsylvania limited partnership, Sujochil, LP (the "Partnership"), at a price of $10.8984 per share. Susan Y. Kim and John T. Kim are general partners of the Partnership. The limited partners of the Partnership are John T. Kim, Susan Y. Kim, two irrevocable trusts created by Susan Y. Kim for her descendants and two irrevocable trusts created by John T. Kim for his descendants. Susan Y. Kim and John T. Kim are the co-trustees of all four trusts.

F1 · price: On January 12, 2017, the David D. Kim Trust of 12/31/87 sold 19,484,809 shares of the Company's Common Stock to a newly created Pennsylvania limited partnership, Sujochil, LP (the "Partnership"), at a price of $10.8984 per share. Susan Y. Kim and John T. Kim are general partners of the Partnership. The limited partners of the Partnership are John T. Kim, Susan Y. Kim, two irrevocable trusts created by Susan Y. Kim for her descendants and two irrevocable trusts created by John T. Kim for his descendants. Susan Y. Kim and John T. Kim are the co-trustees of all four trusts.

F2 · balance_after: 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, or for any other purpose.

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November 03, 2016 Filed Feb 15, 2017 20:08 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 1,414,250 $10.40 $14,708,200.00
Disclosure

SEC source: 0000899243-17-004200 · doc5.xml · nonDerivative · entry 6

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,622,339

F4 · kind: On November 3, 2016, the Susan Y. Kim 2012 Irrevocable Trust U/A Dated 7/26/12 distributed 1,414,250 shares of the Company's Common Stock to Susan Y. Kim. Susan T. Kim and John T. Kim are trustees of the trust.

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November 03, 2016 Filed Feb 15, 2017 20:08 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 1,414,250 $10.40 $14,708,200.00
Disclosure

SEC source: 0000899243-17-004200 · doc5.xml · nonDerivative · entry 5

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 35,047,710

F4 · kind: On November 3, 2016, the Susan Y. Kim 2012 Irrevocable Trust U/A Dated 7/26/12 distributed 1,414,250 shares of the Company's Common Stock to Susan Y. Kim. Susan T. Kim and John T. Kim are trustees of the trust.

F5 · balance_after: 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, or for any other purpose.

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August 04, 2016 Filed Feb 15, 2017 20:08 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 683,460 $7.58 $5,180,626.80
Disclosure

SEC source: 0000899243-17-004200 · doc5.xml · nonDerivative · entry 4

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 35,047,710

F3 · kind: On August 4, 2016, the James J. Kim 2013 Qualified Annuity Trust U/A Dated 5/17/13 distributed 683,460 shares of the Company's Common Stock to James J. Kim. James J. Kim and Susan Y. Kim are co-trustees.

F5 · balance_after: 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, or for any other purpose.

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July 18, 2016 Filed Feb 15, 2017 20:08 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 568,780 $6.09 $3,463,870.20
Disclosure

SEC source: 0000899243-17-004200 · doc5.xml · nonDerivative · entry 3

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,622,339

F2 · kind: On July 18, 2016, the Susan Y. Kim 2015 Irrevocable Trust U/A Dated 3/16/15 distributed 568,780 shares of the Company's Common Stock to Susan Y. Kim. Susan Y. Kim and John T. Kim are co-trustees.

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July 18, 2016 Filed Feb 15, 2017 20:08 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 568,780 $6.09 $3,463,870.20
Disclosure

SEC source: 0000899243-17-004200 · doc5.xml · nonDerivative · entry 2

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 35,047,710

F2 · kind: On July 18, 2016, the Susan Y. Kim 2015 Irrevocable Trust U/A Dated 3/16/15 distributed 568,780 shares of the Company's Common Stock to Susan Y. Kim. Susan Y. Kim and John T. Kim are co-trustees.

F5 · balance_after: 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, or for any other purpose.

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May 20, 2016 Filed May 5, 2017 00:56 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 SaleCommon Stock 800 $5.78 $4,624.00
Disclosure

SEC source: 0001209191-17-030166 · doc4.xml · nonDerivative · entry 1

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,928,966

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February 22, 2016 Filed Feb 15, 2017 20:08 UTC AMKOR TECHNOLOGY, INC. AMKR · Entity 3481 OtherCommon Stock 94,950 $4.79 $454,810.50
Disclosure

SEC source: 0000899243-17-004200 · doc5.xml · nonDerivative · entry 1

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Indirect · By self as trustee

Disclosed balance after: 35,047,710

F1 · kind: On February 22, 2016, the James J. Kim 2014 Qualified Annuity Trust U/A dated October 13, 2014 distributed 94,950 shares to James J. Kim. James J. Kim and Susan Y. Kim are co- trustees of the trust.

F5 · balance_after: 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, or for any other purpose.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.