Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership943,843 shares
Latest Disclosed Value $ 42,501,249
Northern Trust Corp reports 5.45% increase in ownership of AMKR / Amkor Technology, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 943,843 shares of Amkor Technology, Inc. (MX:AMKR) valued at $42,501,249 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 895,040 shares of Amkor Technology, Inc.. This represents a change in shares of 5.45% 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)
2026-05-14 2026-03-31 13F AMKOR TECHNOLOGY COM 031652100 943,843 48,803 5.45 42,501 20.28 0.0012
2026-02-17 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 895,040 -19,832 -2.17 35,336 36.00 0.0045
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 914,872 -10,074 -1.09 25,982 33.83 0.0033
2025-08-13 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 924,946 -27,821 -2.92 19,415 12.83 0.0027
2025-05-13 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 952,767 57,354 6.41 17,207 -25.20 0.0026
2025-02-14 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 895,413 124,671 16.18 23,003 -2.46 0.0033
2024-11-13 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 770,742 -871,336 -53.06 23,585 -64.11 0.0039
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,642,078 -2,846 -0.17 65,716 23.92 0.0111
2024-05-14 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,644,924 -211,059 -11.37 53,032 -14.12 0.0092
2024-02-13 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,855,983 87,928 4.97 61,749 54.53 0.0112
2023-11-13 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,768,055 -11,393 -0.64 39,958 -24.52 0.0077
2023-08-11 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,779,448 -7,165 -0.40 52,939 13.88 0.0102
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,786,613 -28,917 -1.59 46,488 6.78 0.0092
2023-02-13 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,815,530 -19,260 -1.05 43,536 39.16 0.0091
2022-11-14 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,834,790 -32,947 -1.76 31,284 -1.18 0.0071
2022-08-12 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,867,737 -36,913 -1.94 31,658 -23.47 0.0068
2022-05-13 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,904,650 -83,401 -4.20 41,369 -16.06 0.0073
2022-02-08 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,988,051 -33,072 -1.64 49,285 -2.26 0.0081
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,021,123 -114,810 -5.38 50,427 -0.26 0.0089
2021-08-13 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 2,135,933 -623,125 -22.58 50,558 -22.72 0.0089
2021-05-12 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,759,058 -943,235 -25.48 65,418 17.18 0.0122
2021-02-11 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,702,293 -53,800 -1.43 55,829 32.71 0.0109
2020-11-16 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,756,093 -73,267 -1.91 42,068 -10.76 0.0092
2020-08-14 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,829,360 32,862 0.87 47,139 59.38 0.0112
2020-05-14 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,796,498 17,544 0.46 29,576 -39.80 0.0085
2020-02-14 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,778,954 -32,351 -0.85 49,126 41.65 0.0110
2019-11-13 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,811,305 130,101 3.53 34,682 26.29 0.0083
2019-08-13 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,681,204 335,396 10.02 27,462 -3.89 0.0065
2019-05-13 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,345,808 6,363 0.19 28,573 30.43 0.0071
2019-02-12 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,339,445 1,770 0.05 21,907 -11.18 0.0061
2018-11-14 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,337,675 -120,239 -3.48 24,665 -16.96 0.0060
2018-09-18 2018-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 3,457,914 252,447 7.88 29,704 -8.52 0.0075
2018-08-14 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,473,520 268,053 29,838
2018-05-09 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,205,467 34,829 1.10 32,472 1.90 0.0084
2018-02-14 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,170,638 -36,821 -1.15 31,865 -5.83 0.0081
2017-11-13 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,207,459 7,527 0.24 33,838 8.23 0.0088
2017-08-11 2017-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,199,932 63,265 2.02 31,264 -14.00 0.0087
2017-05-12 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,136,667 20,583 0.66 36,353 10.58 0.0105
2017-02-13 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,116,084 -225,713 -6.75 32,874 1.20 0.0101
2016-11-09 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,341,797 74,786 2.29 32,483 72.92 0.0101
2016-08-12 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,267,011 -101,488 -3.01 18,785 -1.88 0.0061
2016-08-19 2016-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 3,368,499 43,548 1.31 19,144 -5.30 0.0064
2016-05-13 2016-03-31 13F Amkor Technology COMM 031652100 3,368,486 19,841
2016-02-12 2015-12-31 13F Amkor Technology COMM 031652100 3,324,951 -23,752 -0.71 20,216 34.46 0.0067
2015-11-12 2015-09-30 13F Amkor Technology COMM 031652100 3,348,703 922,806 38.04 15,035 3.64 0.0050
2015-08-13 2015-06-30 13F AMKOR TECHNOLOGY COM 031652100 2,425,897 -177,225 -6.81 14,507 -36.92 0.0098
2015-08-13 2015-06-30 13F Amkor Technology COMM 003165210 522,206 -2,080,916 3,123 0.0021
2015-05-14 2015-03-31 13F Amkor Technology COMM 031652100 2,603,122 97,943 3.91 22,998 29.30 0.0069
2015-02-12 2014-12-31 13F Amkor Technology COM 031652100 2,505,179 -81,452 -3.15 17,787 -18.24 0.0054
2014-11-13 2014-09-30 13F Amkor Technology COMM 031652100 2,586,631 575,458 28.61 21,754 -3.25 0.0068
2014-08-14 2014-06-30 13F AMKOR TECHNOLOGY com 031652100 2,011,173 -440,441 -17.97 22,485 33.70 0.0070
2014-05-14 2014-03-31 13F AMKOR TECHNOLOGY COMM 031652100 2,451,614 415,528 20.41 16,818 34.75 0.0053
2014-02-21 2013-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 2,036,086 195,042 10.59 12,481 58.35 0.0040
2014-02-12 2013-12-31 13F AMKOR TECHNOLOGY COM 031652100 2,036,086 12,481
2013-11-13 2013-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,841,044 128,702 7.52 7,882 9.35 0.0028
2013-08-09 2013-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,712,342 1,712,342 7,208 0.0026
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.