Public ownership evidence

Amkor Technology Inc (AMKR) Ownership Disclosures

Read AMKR insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Amkor Technology Inc: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-10-06
Trade date
2026-10-02
Reporting owners
ALEXANDER DOUGLAS A
Code
S
Shares
5,000
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001628280-26-065246
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read AMKR fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read AMKR fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity

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2026-10-062026-10-02ALEXANDER DOUGLAS AS5,000Not reported
2026-09-242026-09-22KIM SUSAN YA4Not reported
2026-09-242026-09-22WATSON DAVID NA4Not reported
2026-09-242026-09-22Tily Gil C.A4Not reported
2026-09-242026-09-22Rutten Guillaume Marie JeanA4Not reported
2026-09-242026-09-22Morse Robert RandolphA4Not reported
2026-09-242026-09-22Morse Robert RandolphA14.98Not reported
2026-09-242026-09-22Morse Robert RandolphA12.97Not reported
2026-09-242026-09-22McCourt MaryFrancesA4Not reported
2026-09-242026-09-22McCourt MaryFrancesA12.97Not reported
2026-09-242026-09-22Liao Daniel JLA4Not reported
2026-09-242026-09-22Liao Daniel JLA14.98Not reported
2026-09-242026-09-22CHURCHILL WINSTON JA4Not reported
2026-09-242026-09-22Carolin Roger AnthonyA4Not reported
2026-09-242026-09-22Carolin Roger AnthonyA14.98Not reported
2026-09-242026-09-22Carolin Roger AnthonyA12.97Not reported
2026-09-242026-09-22ALEXANDER DOUGLAS AA4Not reported
2026-09-242026-09-22ALEXANDER DOUGLAS AA14.98Not reported
2026-09-242026-09-22ALEXANDER DOUGLAS AA12.97Not reported
2026-09-242026-09-22ALEXANDER DOUGLAS AA13.32Not reported
2026-09-102026-09-08Faust MeganS1,000Not reported
2026-08-202026-08-17ROGERS MARK NS5,000Not reported
2026-08-142026-08-11Faust MeganS1,000Not reported
2026-08-122026-08-07ALEXANDER DOUGLAS AS5,000Not reported
2026-08-082026-08-06Rutten Guillaume Marie JeanS25,000Not reported
2026-08-082026-08-05Rutten Guillaume Marie JeanS25,000Not reported
2026-08-012026-07-30Engel Kevin K.S3,221Not reported
2026-07-212026-07-16ROGERS MARK NS5,000Not reported
2026-07-172026-07-14Faust MeganS1,000Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Cornerstone Financial Management LLC2026-06-302026-08-2942$3,622None
Cornerstone Financial Management LLC2026-03-312026-08-2931$1,396None
Cornerstone Financial Management LLC2025-12-312026-08-2931$1,224None
Advisors Asset Management, Inc.2021-12-312026-08-281,867$46,283None
Advisors Asset Management, Inc.2022-12-312026-08-285,270$126,375None
Advisors Asset Management, Inc.2022-06-302026-08-284,607$78,000None
Advisors Asset Management, Inc.2021-09-302026-08-28906$23,000None
Corient Private Wealth LP2026-06-302026-08-283,465$298,787None
Corient Private Wealth LP2026-06-302026-08-28154,572$13,328,765None
Wellington Grp LLC2026-06-302026-08-2753,115$4,580,106None
Principia Wealth Advisory, LLC2026-06-302026-08-2741$3,535None
Principia Wealth Advisory, LLC2026-03-312026-08-2740$1,801None
Advisors Asset Management, Inc.2024-03-312026-08-272,014$64,931None
Advisors Asset Management, Inc.2025-03-312026-08-272,236$40,382None
Advisors Asset Management, Inc.2022-09-302026-08-275,384$92,000None
Advisors Asset Management, Inc.2022-03-312026-08-272,936$63,770None
Advisors Asset Management, Inc.2023-06-302026-08-275,146$153,094None
Advisors Asset Management, Inc.2023-09-302026-08-273,979$89,925None
Advisors Asset Management, Inc.2023-03-312026-08-275,240$136,345None
Advisors Asset Management, Inc.2025-09-302026-08-272,363$67,109None
Advisors Asset Management, Inc.2023-12-312026-08-272,983$99,244None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-03-312026-08-2641,824$1,883,335None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-2634,724$2,994,251None
Advisors Asset Management, Inc.2025-06-302026-08-252,784$58,436None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25143,682$12,389,699None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2512,389,699$143,682,000None
Advisors Asset Management, Inc.2024-09-302026-08-22899$27,509None
Advisors Asset Management, Inc.2024-06-302026-08-221,393$55,748None
Advisors Asset Management, Inc.2024-12-312026-08-221,382$35,504None
Advisors Asset Management, Inc.2025-12-312026-08-2210,442$412,250None
Assenagon Asset Management S.A.2026-06-302026-08-22123,535$10,652,423None
Harvest Fund Management Co., Ltd2026-06-302026-08-2118,407$1,587,000None
CANTOR FITZGERALD, L. P.2026-06-302026-08-2067,257$5,799,571None
STOCK YARDS BANK & TRUST CO2026-06-302026-08-202,435$209,970None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2048,528$4,184,557None
JDM Financial Group LLC2026-06-302026-08-1971$6,122None
Ensign Peak Advisors, Inc2026-03-312026-08-197,880$354,836None
Ensign Peak Advisors, Inc2025-12-312026-08-197,880$311,102None
Ensign Peak Advisors, Inc2025-09-302026-08-1913,280$377,152None
Fulcrum Asset Management LLP2026-06-302026-08-193,481$286,626None
Caitlin John, LLC2026-06-302026-08-1840$3,449None
Corient Private Wealth LP2026-06-302026-08-18182,010$15,694,717None
Integrated Investment Consultants, LLC2026-06-302026-08-189,386$809,355None
Integrated Investment Consultants, LLC2026-06-302026-08-188$690None
Empowered Funds, LLC2026-06-302026-08-184,834$416,836None
Empowered Funds, LLC2026-06-302026-08-181,001$86,316None
Empowered Funds, LLC2026-06-302026-08-1877$6,640None
Transamerica Financial Advisors, LLC2026-06-302026-08-18131$11,296None
UNITED CAPITAL FINANCIAL ADVISORS, LLC2026-06-302026-08-183,118$268,865None
Proficio Capital Partners LLC2026-06-302026-08-184,452$383,896None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Corient Private Wealth LP ↗Corient Private Wealth LP ↗Wellington Grp LLC ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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