Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionNorthwestern Mutual Wealth Management Co
Latest Disclosed Ownership2,116 shares
Latest Disclosed Value $ 95,284
Northwestern Mutual Wealth Management Co reports 2.08% decrease in ownership of AMKR / Amkor Technology, Inc.

On May 7, 2026 - Northwestern Mutual Wealth Management Co filed a 13F-HR form disclosing ownership of 2,116 shares of Amkor Technology, Inc. (MX:AMKR) valued at $95,284 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 10, 2026 disclosing 2,161 shares of Amkor Technology, Inc.. This represents a change in shares of -2.08% during the quarter.

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)
2026-05-07 2026-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,116 -45 -2.08 95 11.76 0.0001
2026-02-10 2025-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 2,161 16 0.75 85 41.67 0.0001
2026-02-05 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 149,344 147,199 7,049 0.0045
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,145 292 15.76 61 57.89 0.0000
2025-08-13 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,853 -449 -19.50 39 -7.32 0.0000
2025-05-14 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,302 449 24.23 42 -12.77 0.0000
2025-02-11 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,853 0 0.00 48 -16.07 0.0000
2024-11-12 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,853 -2,335 -55.75 57 -66.47 0.0001
2024-08-16 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 4,188 333 8.64 168 34.68 0.0002
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,855 115 3.07 124 0.00 0.0001
2024-02-13 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,740 48 1.30 124 49.40 0.0001
2023-11-14 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,692 16 0.44 83 -23.85 0.0001
2023-08-14 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,676 2,575 233.88 109 289.29 0.0001
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,101 62 5.97 29 16.67 0.0000
2023-02-21 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,039 -115 -9.97 25 20.00 0.0000
2022-11-14 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,154 -471 -28.98 20 -28.57 0.0000
2022-08-04 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,625 -1,681 -50.85 28 -60.56 0.0000
2022-05-09 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,306 1,728 109.51 71 82.05 0.0001
2022-02-03 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,578 -1,200 -43.20 39 -43.48 0.0001
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,778 -573 -17.10 69 -12.66 0.0001
2021-08-13 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,351 2,551 318.88 79 315.79 0.0002
2021-05-14 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 800 0 0.00 19 58.33 0.0000
2021-02-12 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 800 800 12 0.0000
2020-08-14 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 0 -88 -100.00 0 -100.00
2020-05-08 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 88 50 131.58 1 0.0000
2020-02-13 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 38 38 0 0.0000
2019-05-10 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -235 -100.00 0 -100.00
2019-02-12 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 235 -1,759 -88.21 2 -86.67 0.0000
2018-11-01 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,994 1,994 15 0.0001
2017-05-09 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -112 -100.00 0 -100.00
2017-02-15 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 112 112 1 0.0000
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.