Amkor Technology, Inc.
Amkor Technology, Inc. (AMKR) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AMKR · as of Sep 30, 2025
Ownership Breakdown
406
Institutional Holders
▲ 37 vs Q2
$3.08B
Total Inst. Value
▲ $707.10M vs Q2
247.87M
Shares Outstanding
freeFloat 54.68%
107.73M
13F Shares Held
▼ 5.35M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
AMKR largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC semiconductors & related devices | 15.78M | 6.39% | 6.39% | $448.15B | Nov 7, 2025 | ▲ 687.9K |
BLACKROCK, INC. semiconductors & related devices | 13.83M | 5.60% | 5.60% | $392.91B | Nov 12, 2025 | ▼ 1.07M |
DIMENSIONAL FUND ADVISORS LP semiconductors & related devices | 13.15M | 5.33% | 5.33% | $373.50B | Nov 12, 2025 | ▼ 126.6K |
AQR CAPITAL MANAGEMENT LLC semiconductors & related devices | 4.21M | 1.71% | 1.71% | $119.61B | Nov 14, 2025 | ▲ 653.5K |
EARNEST PARTNERS LLC semiconductors & related devices | 4.21M | 1.70% | 1.70% | $119.46B | Nov 14, 2025 | ▼ 218.8K |
LSV ASSET MANAGEMENT semiconductors & related devices | 3.98M | 1.61% | 1.61% | $113.07B | Nov 6, 2025 | ▼ 850.2K |
AMERICAN CENTURY COMPANIES INC semiconductors & related devices | 3.84M | 1.55% | 1.55% | $108.94B | Nov 12, 2025 | ▲ 17.7K |
STATE STREET CORP semiconductors & related devices | 3.43M | 1.39% | 1.39% | $97.31B | Nov 14, 2025 | ▲ 107.1K |
SW INVESTMENT MANAGEMENT LLC semiconductors & related devices | 2.65M | 1.07% | 1.07% | $75.26B | Nov 12, 2025 | — held |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 2.28M | 92.34% | 92.34% | $64.75B | Nov 12, 2025 | ▲ 24.0K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
25
Increased
+7.03M shares1
New Positions
first time holders22
Decreased
−7.18M shares0
Sold Out
fully exitedNet shares change (top 50)
148.1K
+7.03M / −7.18M
Net new holders
+4
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
AMKR insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
23
Buy transactions
22
Sell transactions
1.05
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
ROGERS MARK N EVP & General Counsel | May 18, 2026 | Sale | 5,000 | $71.63 | $358.1K | 38.9K | Form 4 ↗ |
Faust Megan CFO | May 19, 2026 | Sale | 1,000 | $64.60 | $64.6K | 133.1K | Form 4 ↗ |
KIM SUSAN Y Member of 10% owner group (6) | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
Carolin Roger Anthony director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
ALEXANDER DOUGLAS A director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
McCourt MaryFrances director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
Morse Robert Randolph director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
Liao Daniel JL director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
CHURCHILL WINSTON J director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
Rutten Guillaume Marie Jean director | May 13, 2026 | Award | 2,613 | — | — | 2.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Amkor Technology, Inc. (AMKR) is primarily owned by institutional investors, who hold approximately 43.5% of total shares outstanding. Company insiders own approximately 45.32%, while retail and public investors account for the remaining 11.21%.
The largest institutional shareholder of Amkor Technology, Inc. is VANGUARD GROUP INC, holding approximately 15.78 million shares — equal to 6.39% of outstanding shares — as of September 30, 2025.
A total of 406 institutional investors currently hold AMKR stock, with a combined institutional value of approximately $3.08 billion as of the most recent 13F filing period.
Frequently asked questions
AMKR ownershipAmkor Technology, Inc. (AMKR) is primarily owned by institutional investors, who hold approximately 43.5% of shares. The largest shareholder is VANGUARD GROUP INC with a 6.39% stake. Company insiders hold 45.32%. Data sourced from SEC Form 13F as of September 30, 2025.