Amkor Technology, Inc.
US ˙ NasdaqGS ˙ US0316521006

SecurityAMKR / Amkor Technology, Inc.
InstitutionRobotti Robert
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Robotti Robert closes position in AMKR / Amkor Technology, Inc.

On May 13, 2026 - Robotti Robert filed a 13F-HR form disclosing ownership of 0 shares of Amkor Technology, Inc. (US:AMKR) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 18, 2026 disclosing 17,395 shares of Amkor Technology, Inc.. The current value of the position is $0 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -100.00 0
2026-02-18 2025-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 17,395 -780 -4.29 687 32.95 0.1233
2026-02-12 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 17,395 -780 687
2025-11-12 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 18,175 -173,572 -90.52 516 -87.18 0.0895
2025-08-13 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 191,747 -55,080 -22.32 4,025 -9.72 0.6764
2025-05-13 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 246,827 30,990 14.36 4,458 -19.61 0.8932
2025-02-12 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 215,837 705 0.33 5,545 -15.78 0.9732
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 215,132 -520 -0.24 6,583 -23.72 1.0020
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 215,652 -5,870 -2.65 8,630 20.85 1.3519
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 221,522 39,950 22.00 7,142 18.23 0.9691
2024-02-14 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 181,572 -358 -0.20 6,041 46.92 0.8697
2023-11-14 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 181,930 181,930 4,112 0.6039
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.