SEC ownership of AMKOR TECHNOLOGY, INC.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001047127.

Comparable stake leader

James J. Kim

Disclosed value leader

John T. Kim

Comparable rows

50/50

Latest evidence

05 Aug 2026

Top shareholders Insider holders Latest transactions
Public ticker
AMKR on Nasdaq
Parsed ownership sources
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
James J. Kim
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 3 signals
Comparable ownership rows
50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder
James J. Kim
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date
05 Aug 2026
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0001047127
Issuer location
Tempe, AZ

Ownership snapshot

Top shareholders of AMKOR TECHNOLOGY, INC. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
James J. Kim
Disclosed value leader
John T. Kim
Comparable rows
50/50
Latest evidence
05 Aug 2026
13D/G 3/4/5 13F Lead comparable stake: 30% 13D/G row: James J. Kim Showing 1-8 of 50 holder rows.

Quick read

James J. Kim leads the comparable SEC ownership view at 30%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens James J. Kim's linked filing trail.
Comparable ownership Top 5
James J. Kim 30%
DIMENSIONAL FUND ADVISORS LP 4.4%
John T. Kim 35%
915 Investments, LP 12%
Agnes C. Kim 4.5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
James J. Kim
13D/G 3/4/5
John T. Kim · Member of 10% owner group (5), 10%+ Owner
13D/G 3/4/5
30%
$4,366,654,410
75,339,103 shares
 $0 01 May 2026
DIMENSIONAL FUND ADVISORS LP
13D/G 13F
Company
13D/G 13F
4.4%
$494,945,849
10,991,469 shares
 $0 31 Mar 2026
John T. Kim
3/4/5
Member of 10% owner group (6), 10%+ Owner
3/4/5
35%
$4,398,838,899
86,274,619 shares
 -$484,900,000 12 Feb 2026
915 Investments, LP
3/4/5
Member of 10% owner group (2)
3/4/5
12%
$1,435,060,580
29,594,980 shares
 -$484,900,000 12 Feb 2026
Agnes C. Kim
3/4/5
Member of 10% owner group (4)
3/4/5
4.5%
$964,685,621
11,187,355 shares
 — 20 Jul 2026
David D. Kim
3/4/5
Member of 10% owner group (5)
3/4/5
2.6%
$141,980,797
6,496,738 shares
 — 01 Aug 2025
SUJODA Investments, LP
3/4/5
Member of 10% owner group (2)
3/4/5
1.5%
$82,800,116
3,789,479 shares
 — 01 Aug 2025
Sujoda Management, LLC
3/4/5
Member of 10% owner group (4)
3/4/5
1.5%
$82,800,116
3,789,479 shares
 — 01 Aug 2025
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to selling over the last 12 months. Net value: -$992,073,589.

Buys
$0
Insiders: 0
Sells
$992,073,589
Insiders: 12
Net
-$992,073,589
Shares: -20,414,453
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 0 Shares: 20,414,453
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 91,221 $0 $5,767,747 -$5,767,747
3-6 0 20,160,440 $0 $979,789,282 -$979,789,282
6-9 0 131,000 $0 $5,614,360 -$5,614,360
9-12 0 31,792 $0 $902,200 -$902,200

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 55 reporting-owner rows connected to AMKOR TECHNOLOGY, INC.. Open a relationship link for the CIK-to-CIK filing trail.

Rows
55
Largest Forms 3/4/5 holder
John T. Kim
Net 12M change
-$992,073,589
Latest report
05 Aug 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
John T. Kim Member of 10% owner group (6), 10%+ Owner $4,398,838,899 -$484,900,000 -9.9% Mixed 12 Feb 2026
Susan Y. Kim Director, Member of 10% owner group (5), 10%+ Owner $1,897,824,875 Mixed 23 Jun 2026
915 Investments, LP Member of 10% owner group (2) $1,435,060,580 -$484,900,000 -25% Filing P/S 12 Feb 2026
Agnes C. Kim Member of 10% owner group (4) $964,685,621 Median 20 Jul 2026
James J. Kim Member of 10% owner group (5), 10%+ Owner $964,685,619 Median 20 Jul 2026
Kim Capital Partners - KCP, LLC Member of 10% owner group (3) $534,741,376 Mixed 14 Nov 2023
David D. Kim Member of 10% owner group (5) $141,980,797 Mixed 01 Aug 2025
Sujoda Management, LLC Member of 10% owner group (4) $82,800,116 Filing P/S 01 Aug 2025
SUJODA Investments, LP Member of 10% owner group (2) $82,800,116 Filing P/S 01 Aug 2025
2024 Grantor Retained Annuity Trust of James J. Kim dtd. 8/5/2024 Member of 10% owner group (2) $39,717,600 Mixed 20 Nov 2025
2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024 Member of 10% owner group (2) $36,147,840 Mixed 20 Nov 2025
Kim 2024 Grat #1 Dtd. 08/09/2024 John T. Member of 10% owner group $33,909,600 Mixed 04 Nov 2025
2024 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 8/5/2024 Member of 10% owner group (2) $28,783,200 Mixed 20 Nov 2025
Guillaume Marie Jean Rutten Director $25,397,518 -$9,798,750 -28% Mixed 05 Aug 2026
Family Trust Under the John T. Kim 2018 Irrevocable Trust Agreement Dated 2/6/18 Member of 10% owner group (2) $15,943,424 Mixed 27 Jul 2023
Megan Faust Cfo $9,590,863 -$204,810 -2.1% Mixed 14 Jul 2026
Roger A. Carolin Director $7,238,718 -$1,524,800 -17% Mixed 23 Jun 2026
Robert R. Morse Director $6,118,990 Mixed 23 Jun 2026
David N. Watson Director $5,924,145 Mixed 23 Jun 2026
Gil C. Tily Director $5,385,991 -$2,088,300 -28% Mixed 23 Jun 2026

Recent insider transactions for AMKOR TECHNOLOGY, INC.

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
Guillaume Marie Jean Rutten AMKR Common Stock Sale -5.14% $1,362,500 $54.50 -25,000 461,732 06 Aug 2026 Direct
Guillaume Marie Jean Rutten AMKR Common Stock Sale -4.89% $1,383,750 $55.35 -25,000 486,732 05 Aug 2026 Direct
Winston J. Churchill AMKR Common Stock Gift -0.35% -100 28,681 30 Jul 2026 Direct
Kevin K. Engel AMKR Common Stock Sale -25% $151,387 $47.00 -3,221 9,666 30 Jul 2026 Direct
Agnes C. Kim AMKR Common Stock Options Exercise 4.19% 450,000 11,187,355 20 Jul 2026 By Spouse
James J. Kim AMKR Common Stock Options Exercise 730% 450,000 511,645 20 Jul 2026 Direct
James J. Kim AMKR Employee Stock Option (Right-to-Buy) Options Exercise -100% -450,000 0 20 Jul 2026 Direct
Mark N. Rogers AMKR Common Stock Sale -11.4% $325,600 $65.12 -5,000 38,904 16 Jul 2026 Direct
Mark N. Rogers AMKR Common Stock Options Exercise 12.8% 5,000 43,904 16 Jul 2026 Direct
Mark N. Rogers AMKR Employee Stock Option (Right-to-Buy) Options Exercise -6.25% -5,000 75,000 16 Jul 2026 Direct
Megan Faust AMKR Common Stock Sale -0.73% $69,910 $69.91 -1,000 136,105 14 Jul 2026 Direct
Kevin K. Engel AMKR Common Stock Tax liability -22.4% -3,725 12,887 30 Jun 2026 Direct
Kevin K. Engel AMKR Common Stock Options Exercise 109.8% 8,692 16,612 30 Jun 2026 Direct
Kevin K. Engel AMKR Restricted Stock Units Options Exercise -100% -8,692 0 30 Jun 2026 Direct
Megan Faust AMKR Common Stock Tax liability -2.65% -3,725 137,105 30 Jun 2026 Direct
Megan Faust AMKR Common Stock Options Exercise 6.58% 8,692 140,830 30 Jun 2026 Direct
Megan Faust AMKR Restricted Stock Units Options Exercise -100% -8,692 0 30 Jun 2026 Direct
Guillaume Marie Jean Rutten AMKR Common Stock Options Exercise 1.73% 8,692 511,732 30 Jun 2026 Direct
Guillaume Marie Jean Rutten AMKR Restricted Stock Units Options Exercise -100% -8,692 0 30 Jun 2026 Direct
Susan Y. Kim AMKR Restricted Stock Units Award 0.1% 2.52 2,616 23 Jun 2026 Direct
David N. Watson AMKR Restricted Stock Units Award 0.1% 2.52 2,616 23 Jun 2026 Direct
Gil C. Tily AMKR Restricted Stock Units Award 0.1% 2.52 2,616 23 Jun 2026 Direct
Guillaume Marie Jean Rutten AMKR Restricted Stock Units Award 0.1% 2.52 2,616 23 Jun 2026 Direct
Robert R. Morse AMKR Restricted Stock Units Award 0.2% 20.11 9,902 23 Jun 2026 Direct
MaryFrances McCourt AMKR Restricted Stock Units Award 0.12% 10.68 8,904 23 Jun 2026 Direct
Daniel Jl Liao AMKR Restricted Stock Units Award 0.12% 11.94 9,902 23 Jun 2026 Direct
Winston J. Churchill AMKR Restricted Stock Units Award 0.1% 2.52 2,616 23 Jun 2026 Direct
Roger A. Carolin AMKR Restricted Stock Units Award 0.2% 20.11 9,902 23 Jun 2026 Direct
Douglas A. Alexander AMKR Restricted Stock Units Award 0.29% 28.49 9,902 23 Jun 2026 Direct
Mark N. Rogers AMKR Common Stock Sale -11.4% $431,050 $86.21 -5,000 38,904 16 Jun 2026 Direct
Mark N. Rogers AMKR Common Stock Options Exercise 12.8% 5,000 43,904 16 Jun 2026 Direct
Mark N. Rogers AMKR Employee Stock Option (Right-to-Buy) Options Exercise -5.88% -5,000 80,000 16 Jun 2026 Direct
Winston J. Churchill AMKR Common Stock Sale -14.8% $391,000 $78.20 -5,000 28,781 12 Jun 2026 Direct
Winston J. Churchill AMKR Common Stock Options Exercise 17.4% 5,000 33,781 12 Jun 2026 Direct
Winston J. Churchill AMKR Director Stock Option (Right-to-Buy) Options Exercise -33.3% -5,000 10,000 12 Jun 2026 Direct
Susan Y. Kim AMKR Common Stock Award 0.16% 9,893 6,120,387 12 Jun 2026 Direct
Megan Faust AMKR Common Stock Sale -0.75% $70,300 $70.30 -1,000 132,138 09 Jun 2026 Direct
Megan Faust AMKR Common Stock Sale -0.75% $64,600 $64.60 -1,000 133,138 19 May 2026 Direct
Mark N. Rogers AMKR Common Stock Sale -11.4% $358,150 $71.63 -5,000 38,904 18 May 2026 Direct
Mark N. Rogers AMKR Common Stock Options Exercise 12.8% 5,000 43,904 18 May 2026 Direct
Mark N. Rogers AMKR Employee Stock Option (Right-to-Buy) Options Exercise -5.56% -5,000 85,000 18 May 2026 Direct
Susan Y. Kim AMKR Restricted Stock Units Award 2,613 2,613 13 May 2026 Direct
Susan Y. Kim AMKR Restricted Stock Units Options Exercise -100% -9,893 0 13 May 2026 Direct
Roger A. Carolin AMKR Restricted Stock Units Award 2,613 2,613 13 May 2026 Direct
Douglas A. Alexander AMKR Restricted Stock Units Award 2,613 2,613 13 May 2026 Direct
MaryFrances McCourt AMKR Common Stock Options Exercise 17.7% 9,893 65,811 13 May 2026 Direct
MaryFrances McCourt AMKR Restricted Stock Units Award 2,613 2,613 13 May 2026 Direct
MaryFrances McCourt AMKR Restricted Stock Units Options Exercise -100% -9,893 0 13 May 2026 Direct
Robert R. Morse AMKR Restricted Stock Units Award 2,613 2,613 13 May 2026 Direct
Daniel Jl Liao AMKR Restricted Stock Units Award 2,613 2,613 13 May 2026 Direct
* marks a reported price that did not pass the local price check.
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