Comparable stake leader
James J. Kim
SEC ownership of AMKOR TECHNOLOGY, INC.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001047127.
Disclosed value leader
John T. Kim
Comparable rows
50/50
Latest evidence
01 May 2026
- Public ticker
- AMKR on Nasdaq
- Parsed ownership sources
- 13D/G, 3/4/5, and 13F
- Largest SEC-reported holder
- James J. Kim
- Latest 13D/G holder
- James J. Kim
- Latest parsed ownership date
- 01 May 2026
- Issuer CIK
- 0001047127
- Issuer location
- Tempe, AZ
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
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
01 May 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
4.3%
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 (4), 10%+ Owner
|
30%
|
$4,366,654,410
75,339,103 shares
|
$0 | 01 May 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13D/G
13F
Company
|
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
|
35%
|
$4,398,838,899
86,274,619 shares
|
-$475,251,280 | 12 Feb 2026 |
| 915 Investments, LP |
3/4/5
Member of 10% owner group (2)
|
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 (3)
|
4.3%
|
$355,835,944
10,737,355 shares
|
-$9,648,720 | 26 Dec 2025 |
| David D. Kim |
3/4/5
Member of 10% owner group (5)
|
2.6%
|
$141,980,797
6,496,738 shares
|
+$9,648,720 | 01 Aug 2025 |
| SUJODA Investments, LP |
3/4/5
Member of 10% owner group (2)
|
1.5%
|
$82,800,116
3,789,479 shares
|
+$9,648,720 | 01 Aug 2025 |
| Sujoda Management, LLC |
3/4/5
Member of 10% owner group (4)
|
1.5%
|
$82,800,116
3,789,479 shares
|
+$9,648,720 | 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: -$959,295,661.
Buys
$48,243,598
Insiders: 5
Sells
$1,007,539,259
Insiders: 14
Net
-$959,295,661
Shares: -19,034,465
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 2,207,945
Shares: 21,242,410
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 113,000 | $0 | $8,258,950 | -$8,258,950 |
| 3-6 | 0 | 20,169,440 | $0 | $977,776,342 | -$977,776,342 |
| 6-9 | 0 | 61,792 | $0 | $1,852,800 | -$1,852,800 |
| 9-12 | 2,207,945 | 898,178 | $48,243,598 | $19,651,166 | +$28,592,432 |
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
-$959,295,659
Latest report
19 May 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |||
| Winston J. Churchill | AMKR | Common Stock | Options Exercise | 52.4% | 9,893 | 28,781 | 13 May 2026 | Direct | ||
| Winston J. Churchill | AMKR | Restricted Stock Units | Award | 2,613 | 2,613 | 13 May 2026 | Direct | |||
| Winston J. Churchill | AMKR | Restricted Stock Units | Options Exercise | -100% | -9,893 | 0 | 13 May 2026 | Direct | ||
| Guillaume Marie Jean Rutten | AMKR | Common Stock | Options Exercise | 0.1% | 482 | 503,040 | 13 May 2026 | Direct | ||
| Guillaume Marie Jean Rutten | AMKR | Restricted Stock Units | Award | 2,613 | 2,613 | 13 May 2026 | Direct | |||
| Guillaume Marie Jean Rutten | AMKR | Restricted Stock Units | Options Exercise | -100% | -482 | 0 | 13 May 2026 | Direct | ||
| Gil C. Tily | AMKR | Common Stock | Options Exercise | 9.09% | 9,893 | 118,699 | 13 May 2026 | Direct | ||
| Gil C. Tily | AMKR | Restricted Stock Units | Award | 2,613 | 2,613 | 13 May 2026 | Direct | |||
| Gil C. Tily | AMKR | Restricted Stock Units | Options Exercise | -100% | -9,893 | 0 | 13 May 2026 | Direct | ||
| David N. Watson | AMKR | Common Stock | Options Exercise | 8.19% | 9,893 | 130,650 | 13 May 2026 | Direct | ||
| David N. Watson | AMKR | Restricted Stock Units | Award | 2,613 | 2,613 | 13 May 2026 | Direct | |||
| David N. Watson | AMKR | Restricted Stock Units | Options Exercise | -100% | -9,893 | 0 | 13 May 2026 | Direct | ||
| Gil C. Tily | AMKR | Common Stock | Sale | -12.1% | $1,159,500 | $77.30 | -15,000 | 108,806 | 11 May 2026 | Direct |
| Guillaume Marie Jean Rutten | AMKR | Common Stock | Sale | -9.05% | $3,714,000 | $74.28 | -50,000 | 502,558 | 08 May 2026 | Direct |
| Roger A. Carolin | AMKR | Common Stock | Sale | -17.5% | $1,524,800 | $76.24 | -20,000 | 94,409 | 05 May 2026 | Direct |
| Roger A. Carolin | AMKR | Common Stock | Options Exercise | 21.2% | 20,000 | 114,409 | 05 May 2026 | Direct | ||
| Roger A. Carolin | AMKR | Director Stock Option (Right to Buy) | Options Exercise | -100% | -20,000 | 0 | 05 May 2026 | Direct | ||
| Winston J. Churchill | AMKR | Common Stock | Sale | -27% | $535,150 | $76.45 | -7,000 | 18,888 | 05 May 2026 | Direct |
| Douglas A. Alexander | AMKR | Common Stock | Sale | -14.7% | $382,900 | $76.58 | -5,000 | 29,109 | 05 May 2026 | Direct |
| Douglas A. Alexander | AMKR | Common Stock | Options Exercise | 17.4% | 5,000 | 33,766 | 05 May 2026 | Direct | ||
| Douglas A. Alexander | AMKR | Director Stock Option (Right-to-Buy) | Options Exercise | -100% | -5,000 | 0 | 05 May 2026 | Direct | ||
| Mark N. Rogers | AMKR | Common Stock | Sale | -11.4% | $297,150 | $59.43 | -5,000 | 38,904 | 16 Apr 2026 | Direct |
| Mark N. Rogers | AMKR | Common Stock | Options Exercise | 12.8% | 5,000 | 43,904 | 16 Apr 2026 | Direct | ||
| Mark N. Rogers | AMKR | Employee Stock Option (Right-to-Buy) | Options Exercise | -5.26% | -5,000 | 90,000 | 16 Apr 2026 | Direct | ||
| Susan Y. Kim | AMKR | Common Stock | Options Exercise | 0.33% | 20,000 | 6,110,494 | 07 Apr 2026 | Direct | ||
| Susan Y. Kim | AMKR | Director stock option (right to buy) | Options Exercise | -100% | -20,000 | 0 | 07 Apr 2026 | Direct | ||
| Robert R. Morse | AMKR | Common Stock | Tax liability | -1.73% | -2,378 | 134,977 | 07 Apr 2026 | Direct | ||
| Robert R. Morse | AMKR | Common Stock | Options Exercise | 17% | 20,000 | 137,355 | 07 Apr 2026 | Direct | ||
| Robert R. Morse | AMKR | Director Stock Option (Right-to-Buy) | Options Exercise | -100% | -20,000 | 0 | 07 Apr 2026 | Direct | ||
| Guillaume Marie Jean Rutten | AMKR | Restricted Stock Units | Award | 482 | 482 | 01 Apr 2026 | Direct | |||
| David N. Watson | AMKR | Restricted Stock Units | Award | 0.18% | 18.16 | 9,893 | 31 Mar 2026 | Direct | ||
| Gil C. Tily | AMKR | Restricted Stock Units | Award | 0.18% | 18.16 | 9,893 | 31 Mar 2026 | Direct | ||
| Guillaume Marie Jean Rutten | AMKR | Common Stock | Options Exercise | 1.6% | 8,692 | 552,558 | 31 Mar 2026 | Direct | ||
| Guillaume Marie Jean Rutten | AMKR | Restricted Stock Units | Options Exercise | -50% | -8,692 | 8,692 | 31 Mar 2026 | Direct | ||
| Robert R. Morse | AMKR | Restricted Stock Units | Award | 0.34% | 33.88 | 9,893 | 31 Mar 2026 | Direct | ||
| MaryFrances McCourt | AMKR | Restricted Stock Units | Award | 0.34% | 33.88 | 9,893 | 31 Mar 2026 | Direct | ||
| Susan Y. Kim | AMKR | Restricted Stock Units | Award | 0.18% | 18.16 | 9,893 | 31 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.