Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership2,622,744 shares
Latest Disclosed Value $ 118,107,208
Principal Financial Group Inc reports 19.26% increase in ownership of AMKR / Amkor Technology, Inc.

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 2,622,744 shares of Amkor Technology, Inc. (MX:AMKR) valued at $118,107,208 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 2,199,115 shares of Amkor Technology, Inc.. This represents a change in shares of 19.26% 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)
2026-05-04 2026-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,622,744 423,629 19.26 118,107 36.02 0.0631
2026-02-02 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 2,199,115 -69,725 -3.07 86,833 34.76 0.0443
2025-11-04 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,268,840 -61,840 -2.65 64,435 31.71 0.0325
2025-08-08 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 2,330,680 341,173 17.15 48,921 36.16 0.0259
2025-04-28 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,989,507 17,214 0.87 35,931 -29.08 0.0202
2025-01-31 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,972,293 611,209 44.91 50,665 21.65 0.0276
2024-10-31 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,361,084 925,644 212.58 41,647 138.99 0.0229
2024-07-29 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 435,440 -11,728 -2.62 17,426 20.88 0.0103
2024-04-29 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 447,168 8,470 1.93 14,417 -1.23 0.0085
2024-02-07 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 438,698 12,846 3.02 14,595 51.65 0.0093
2023-11-02 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 425,852 20,399 5.03 9,624 -20.21 0.0069
2023-08-07 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 405,453 -10,854 -2.61 12,062 11.36 0.0082
2023-05-09 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 416,307 2,727 0.66 10,832 9.23 0.0077
2023-02-09 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 413,580 21,949 5.60 9,918 48.50 0.0075
2022-11-09 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 391,631 -573 -0.15 6,678 0.45 0.0053
2022-08-10 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 392,204 371,500 1,794.34 6,648 1,377.33 0.0049
2022-05-09 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 20,704 -323,905 -93.99 450 -94.73 0.0002
2022-05-09 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 367,160 7,975
2022-02-09 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 344,609 -181,978 -34.56 8,543 -34.97 0.0051
2021-11-09 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 526,587 -23,484 -4.27 13,138 0.91 0.0086
2021-08-10 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 550,071 177,289 47.56 13,020 47.30 0.0084
2021-05-10 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 372,782 360,550 2,947.60 8,839 5,753.64 0.0062
2020-08-05 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 12,232 -1,616 -11.67 151 39.81 0.0001
2020-05-12 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 13,848 13,848 108 0.0001
2019-08-12 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 0 -12,510 -100.00 0 -100.00
2019-05-10 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 12,510 546 4.56 107 37.18 0.0001
2019-02-14 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 11,964 -5,364 -30.96 78 -39.06 0.0001
2018-11-14 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 17,328 -628 -3.50 128 -16.88 0.0001
2018-08-13 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 17,956 -676 -3.63 154 -18.52 0.0001
2018-05-14 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 18,632 -8,138 -30.40 189 -29.74 0.0002
2018-02-12 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 26,770 -49,697 -64.99 269 -66.63 0.0002
2017-11-02 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 76,467 -3,889 -4.84 806 2.68 0.0008
2017-08-08 2017-06-30 13F AMKOR TECHNOLOGY COM 031652100 80,356 52,538 188.86 785 143.79 0.0008
2017-05-11 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 27,818 -2,375 -7.87 322 0.94 0.0004
2017-02-13 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 30,193 6,257 26.14 319 36.91 0.0004
2016-11-10 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 23,936 -1,128 -4.50 233 61.81 0.0003
2016-08-09 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 25,064 5,925 30.96 144 27.43 0.0002
2016-05-10 2016-03-31 13F AMKOR TECHNOLOGY COM 031652100 19,139 -4,183 -17.94 113 -20.42 0.0002
2016-02-09 2015-12-31 13F AMKOR TECHNOLOGY COM 031652100 23,322 5,548 31.21 142 77.50 0.0002
2015-11-12 2015-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 17,774 689 4.03 80 -21.57 0.0001
2015-11-09 2015-09-30 13F AMKOR TECHNOLOGY COM 031652100 17,774 80
2015-08-10 2015-06-30 13F AMKOR TECHNOLOGY COM 031652100 17,085 -7,464 -30.40 102 -53.00 0.0002
2015-05-14 2015-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 24,549 1,958 8.67 217 35.63 0.0003
2015-05-12 2015-03-31 13F AMKOR TECHNOLOGY COM 031652100 24,549 217
2015-02-12 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 22,591 -7,605 -25.19 160 -37.01 0.0002
2014-11-13 2014-09-30 13F AMKOR TECHNOLOGY COM 031652100 30,196 0 0.00 254 -24.85 0.0004
2014-08-12 2014-06-30 13F AMKOR TECHNOLOGY COM 031652100 30,196 124 0.41 338 64.08 0.0006
2014-05-13 2014-03-31 13F AMKOR TECHNOLOGY COM 031652100 30,072 -616 -2.01 206 9.57 0.0004
2014-02-12 2013-12-31 13F AMKOR TECHNOLOGY COM 031652100 30,688 -567 -1.81 188 40.30 0.0004
2013-11-05 2013-09-30 13F AMKOR TECHNOLOGY COM 031652100 31,255 -2,000 -6.01 134 -4.29 0.0003
2013-08-12 2013-06-30 13F AMKOR TECHNOLOGY COM 031652100 33,255 33,255 140 0.0003
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.