Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership3,628,542 shares
Latest Disclosed Value $ 163,393,246
State Street Corp reports 4.45% increase in ownership of AMKR / Amkor Technology, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 3,628,542 shares of Amkor Technology, Inc. (MX:AMKR) valued at $163,393,246 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,473,925 shares of Amkor Technology, Inc.. This represents a change in shares of 4.45% 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)
2026-05-15 2026-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,628,542 154,617 4.45 163,393 19.13 0.0056
2026-02-13 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,473,925 47,514 1.39 137,151 40.94 0.0046
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,426,411 107,118 3.23 97,310 39.67 0.0034
2025-08-14 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,319,293 -253,994 -7.11 69,672 7.48 0.0026
2025-05-15 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,573,287 -80 -0.00 64,823 -29.39 0.0027
2025-02-14 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,573,367 217,550 6.48 91,800 -10.60 0.0036
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,355,817 176,528 5.55 102,688 -19.29 0.0042
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,179,289 -657,108 -17.13 127,235 2.63 0.0056
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,836,397 109,561 2.94 123,981 -0.01 0.0055
2024-02-14 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,726,836 241,407 6.93 123,992 57.41 0.0060
2023-11-14 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,485,429 51,202 1.49 78,771 -22.90 0.0044
2023-08-14 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,434,227 -81,665 -2.32 102,168 11.68 0.0054
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,515,892 95,883 2.80 91,484 11.55 0.0052
2023-05-15 2022-12-31 13F/A-99 AMKOR TECHNOLOGY COM 031652100 3,420,009 -3,016 -0.09 82,012 40.52 0.0048
2023-05-15 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,420,009 -3,016 82,012 0.0048
2022-11-15 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,423,025 71,034 2.12 58,363 2.72 0.0037
2022-08-15 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,351,991 -3,049 -0.09 56,816 -22.03 0.0034
2022-05-16 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,355,040 106,685 3.28 72,871 -9.51 0.0036
2022-02-14 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 3,248,355 23,500 0.73 80,527 0.08 0.0038
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,224,855 -66,883 -2.03 80,460 3.27 0.0043
2021-08-16 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,291,738 85,430 2.66 77,915 2.49 0.0041
2021-07-09 2021-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 3,206,308 1,113,445 53.20 76,022 140.25 0.0044
2021-05-17 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,206,308 1,113,445 76,022 0.0044
2021-02-16 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 2,092,863 -20,850 -0.99 31,643 33.66 0.0019
2020-11-10 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,113,713 -70,258 -3.22 23,674 -11.94 0.0016
2020-08-14 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 2,183,971 16,351 0.75 26,885 59.21 0.0020
2020-06-19 2020-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 2,167,620 -246,624 -10.22 16,886 -46.20 0.0015
2020-05-11 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,167,620 -246,624 16,886 1,482.9308
2020-02-06 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 2,414,244 -13,938 -0.57 31,385 42.04 0.0021
2019-11-14 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,428,182 44,227 1.86 22,096 24.25 0.0016
2019-08-14 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 2,383,955 -49,882 -2.05 17,784 -14.44 0.0013
2019-05-15 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,433,837 39,688 1.66 20,785 32.34 0.0016
2019-02-12 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 2,394,149 -42,229 -1.73 15,706 -12.76 0.0014
2018-11-09 2018-09-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,436,378 83,116 3.53 18,003 -10.94 0.0014
2018-08-14 2018-06-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,353,262 39,561 1.71 20,215 -13.75 0.0017
2018-05-15 2018-03-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,313,701 3,292 0.14 23,439 0.96 0.0020
2018-02-14 2017-12-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,310,409 45,199 2.00 23,216 -2.86 0.0019
2017-11-14 2017-09-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,265,210 -21,457 -0.94 23,900 6.96 0.0021
2017-08-14 2017-06-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,286,667 107,911 4.95 22,344 -11.51 0.0020
2017-05-15 2017-03-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,178,756 -87,237 -3.85 25,250 5.63 0.0023
2017-02-09 2016-12-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,265,993 160,097 7.60 23,904 16.79 0.0022
2017-01-13 2016-09-30 13F/A-1 AMKOR TECHNOLOGY Common equity shares 031652100 2,105,896 43,240 2.10 20,468 72.59 0.0021
2016-11-14 2016-09-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,105,896 20,468
2016-08-12 2016-06-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 2,062,656 72,463 3.64 11,859 1.16 0.0013
2016-05-20 2016-03-31 13F/A-1 AMKOR TECHNOLOGY Common equity shares 031652100 1,990,193 208,898 11.73 11,723 8.22 0.0013
2016-05-12 2016-03-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,990,193 11,723
2016-02-16 2015-12-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,781,295 154,802 9.52 10,833 48.34 0.0012
2015-11-16 2015-09-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,626,493 -2,295 -0.14 7,303 -25.01 0.0009
2015-08-13 2015-06-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,628,788 -10,929 -0.67 9,739 -32.79 0.0010
2015-05-15 2015-03-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,639,717 83,040 5.33 14,490 31.13 0.0015
2015-02-11 2014-12-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,556,677 -11,297 -0.72 11,050 -16.21 0.0011
2014-11-12 2014-09-30 13F/A-1 AMKOR TECHNOLOGY Common equity shares 031652100 1,567,974 -51,272 -3.17 13,187 -27.15 0.0014
2014-11-10 2014-09-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,567,974 13,187
2014-08-12 2014-06-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,619,246 51,884 3.31 18,102 68.33 0.0020
2014-05-15 2014-03-31 13F/A-1 AMKOR TECHNOLOGY Common equity shares 031652100 1,567,362 -253,655 -13.93 10,754 -3.65 0.0012
2014-05-13 2014-03-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,567,362 10,754
2014-02-06 2013-12-31 13F/A-1 AMKOR TECHNOLOGY Common equity shares 031652100 1,821,017 -113,882 -5.89 11,161 34.36 0.0012
2014-02-06 2013-12-31 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,796,832 7,639
2013-11-12 2013-09-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,934,899 -19,967 -1.02 8,307 0.95 0.0010
2013-08-08 2013-06-30 13F AMKOR TECHNOLOGY Common equity shares 031652100 1,954,866 1,954,866 8,229 0.0011
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.