Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionAcadian Asset Management Llc
Latest Disclosed Ownership394,264 shares
Latest Disclosed Value $ 17,739
Acadian Asset Management Llc reports 107.39% increase in ownership of AMKR / Amkor Technology, Inc.

On May 13, 2026 - Acadian Asset Management Llc filed a 13F-HR form disclosing ownership of 394,264 shares of Amkor Technology, Inc. (MX:AMKR) valued at $17,739 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 190,103 shares of Amkor Technology, Inc.. This represents a change in shares of 107.39% 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)
2026-05-13 2026-03-31 13F AMKOR TECHNOLOGY COM 031652100 394,264 204,161 107.39 18 142.86 0.0252
2026-02-10 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 190,103 26,661 16.31 8 75.00 0.0123
2025-11-13 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 163,442 100,762 160.76 5 300.00 0.0081
2025-08-07 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 62,680 -1,157 -1.81 1 0.00 0.0027
2025-05-21 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 63,837 63,837 1 0.0033
2024-11-12 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 0 -113,751 -100.00 0 -100.00
2024-08-06 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 113,751 111,472 4,891.27 5 0.0140
2024-05-10 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 2,279 0 0.00 0 0.0003
2024-02-13 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 2,279 -1,938 -45.96 0 0.0003
2023-11-13 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 4,217 875 26.18 0 0.0004
2023-08-07 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,342 3,342 0 0.0004
2022-05-12 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -6,911 -100.00 0 -100.00
2022-02-10 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 6,911 6,911 171 0.0006
2021-08-11 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 0 -18,634 -100.00 0 -100.00
2021-05-11 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 18,634 -593,348 -96.96 442 -95.21 0.0017
2021-02-11 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 611,982 35,266 6.11 9,228 42.87 0.0357
2020-11-09 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 576,716 -452,601 -43.97 6,459 -49.03 0.0271
2020-08-12 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,029,317 1,029,317 12,672 0.0545
2020-02-06 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 0 -388,100 -100.00 0 -100.00
2019-11-07 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 388,100 388,100 3,531 0.0151
2019-08-08 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 0 -182,829 -100.00 0 -100.00
2019-05-09 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 182,829 158,774 660.05 1,562 888.61 0.0067
2019-02-07 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 24,055 14,699 157.11 158 128.99 0.0008
2018-10-30 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 9,356 8,557 1,070.96 69 885.71 0.0003
2018-07-24 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 799 67 9.15 7 0.00 0.0000
2018-04-12 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 732 -92,270 -99.21 7 -99.25 0.0000
2018-01-18 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 93,002 92,300 13,148.15 935 13,257.14 0.0041
2017-10-13 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 702 -173,899 -99.60 7 -99.59 0.0000
2017-07-25 2017-06-30 13F AMKOR TECHNOLOGY COM 031652100 174,601 133,330 323.06 1,705 256.69 0.0077
2017-04-25 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 41,271 -354,290 -89.57 478 -88.54 0.0022
2017-01-19 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 395,561 363,844 1,147.16 4,172 1,254.55 0.0203
2016-10-20 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 31,717 -210,380 -86.90 308 -77.91 0.0015
2016-07-19 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 242,097 -384,542 -61.37 1,394 -62.23 0.0071
2016-04-14 2016-03-31 13F AMKOR TECHNOLOGY COM 031652100 626,639 -253,352 -28.79 3,691 -31.01 0.0186
2016-01-14 2015-12-31 13F AMKOR TECHNOLOGY COM 031652100 879,991 -1,700,636 -65.90 5,350 -53.82 0.0280
2015-10-15 2015-09-30 13F AMKOR TECHNOLOGY COM 031652100 2,580,627 -3,341,560 -56.42 11,586 -67.28 0.0632
2015-08-11 2015-06-30 13F AMKOR TECHNOLOGY COM 031652100 5,922,187 -383,261 -6.08 35,413 -36.43 0.1718
2015-04-20 2015-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 6,305,448 -719,872 -10.25 55,708 11.68 0.2571
2015-01-23 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 7,025,320 -651,125 -8.48 49,881 -22.74 0.2223
2014-10-22 2014-09-30 13F AMKOR TECHNOLOGY COM 031652100 7,676,445 2,084,974 37.29 64,561 3.28 0.3117
2014-07-21 2014-06-30 13F AMKOR TECHNOLOGY COM 031652100 5,591,471 4,426,592 380.00 62,509 682.05 0.3039
2014-04-22 2014-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,164,879 1,072,367 1,159.17 7,993 1,309.70 0.0419
2014-01-22 2013-12-31 13F AMKOR TECHNOLOGY COM 031652100 92,512 75,978 459.53 567 710.00 0.0032
2013-08-06 2013-06-30 13F/A-1 AMKOR TECHNOLOGY COM 003165210 16,534 16,534 70 0.0005
2013-08-05 2013-06-30 13F AMKOR TECHNOLOGY COM 003165210 33,068 140 0.0005
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.