Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership350,306 shares
Latest Disclosed Value $ 13,830,081
Alliancebernstein L.p. reports 10.30% decrease in ownership of AMKR / Amkor Technology, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 350,306 shares of Amkor Technology, Inc. (MX:AMKR) valued at $13,830,081 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 390,540 shares of Amkor Technology, Inc.. This represents a change in shares of -10.30% 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 350,306 -40,234 -10.30 13,830 -10.30 0.0037
2026-02-17 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 390,540 95,804 32.51 15,419 84.21 0.0049
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 294,736 27,112 10.13 8,371 49.01 0.0026
2025-08-14 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 267,624 -2,957,959 -91.70 5,617 -90.36 0.0018
2025-05-15 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,225,583 -855,898 -20.97 58,254 -44.44 0.0211
2025-02-12 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 4,081,481 556,761 15.80 104,853 -2.78 0.0356
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,524,720 309,586 9.63 107,856 -16.18 0.0362
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 3,215,134 -641,284 -16.63 128,670 3.49 0.0449
2024-05-14 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 3,856,418 -574,799 -12.97 124,331 -15.67 0.0440
2024-02-14 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 4,431,217 539,402 13.86 147,427 67.62 0.0567
2023-11-14 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 3,891,815 -290,518 -6.95 87,955 -29.31 0.0374
2023-08-15 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 4,182,333 3,957,221 1,757.89 124,424 2,024.36 0.0508
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 225,112 -17,520 -7.22 5,857 0.67 0.0025
2023-02-15 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 242,632 633 0.26 5,818 41.01 0.0026
2022-11-15 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 241,999 -1,486 -0.61 4,126 -0.02 0.0020
2022-08-15 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 243,485 3,152 1.31 4,127 -20.94 0.0019
2022-05-13 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 240,333 15,438 6.86 5,220 -6.37 0.0020
2022-02-14 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 224,895 -9,748 -4.15 5,575 -4.77 0.0020
2021-11-10 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 234,643 -33,460 -12.48 5,854 -7.75 0.0023
2021-07-30 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 268,103 15,930 6.32 6,346 6.14 0.0025
2021-05-06 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 252,173 92,745 58.17 5,979 148.71 0.0026
2021-02-08 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 159,428 -4,514 -2.75 2,404 30.94 0.0011
2020-11-12 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 163,942 -21,075 -11.39 1,836 -19.40 0.0010
2020-08-13 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 185,017 31,217 20.30 2,278 90.15 0.0013
2020-05-14 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 153,800 -2,650 -1.69 1,198 -41.10 0.0009
2020-02-18 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 156,450 -70 -0.04 2,034 42.84 0.0012
2019-11-14 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 156,520 -1,100 -0.70 1,424 21.09 0.0009
2019-08-14 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 157,620 -80 -0.05 1,176 -12.69 0.0007
2019-05-14 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 157,700 -200 -0.13 1,347 30.02 0.0009
2019-02-13 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 157,900 6,200 4.09 1,036 -7.58 0.0008
2018-11-08 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 151,700 0 0.00 1,121 -13.97 0.0007
2018-08-13 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 151,700 -92,750 -37.94 1,303 -47.37 0.0009
2018-05-14 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 244,450 -8,260 -3.27 2,476 -2.52 0.0018
2018-02-13 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 252,710 75,880 42.91 2,540 36.12 0.0018
2017-11-13 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 176,830 36,830 26.31 1,866 36.40 0.0014
2017-08-10 2017-06-30 13F AMKOR TECHNOLOGY COM 031652100 140,000 -300 -0.21 1,368 -15.87 0.0011
2017-05-11 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 140,300 -290,590 -67.44 1,626 -64.23 0.0013
2017-02-13 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 430,890 261,090 153.76 4,546 175.52 0.0038
2016-11-10 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 169,800 -14,900 -8.07 1,650 55.37 0.0014
2016-08-11 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 184,700 50,400 37.53 1,062 34.26 0.0009
2016-05-13 2016-03-31 13F AMKOR TECHNOLOGY COM 031652100 134,300 3,500 2.68 791 -0.50 0.0007
2016-02-16 2015-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 130,800 -98,312 -42.91 795 -22.74 0.0007
2016-02-12 2015-12-31 13F AMKOR TECHNOLOGY COM 031652100 130,800 587
2015-11-13 2015-09-30 13F AMKOR TECHNOLOGY COM 031652100 229,112 77,012 50.63 1,029 13.08 0.0009
2015-08-14 2015-06-30 13F AMKOR TECHNOLOGY COM 031652100 152,100 -23,300 -13.28 910 -41.29 0.0008
2015-05-13 2015-03-31 13F AMKOR TECHNOLOGY COM 031652100 175,400 0 0.00 1,550 24.50 0.0013
2015-02-13 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 175,400 0 0.00 1,245 -15.59 0.0010
2014-11-13 2014-09-30 13F AMKOR TECHNOLOGY COM 031652100 175,400 0 0.00 1,475 -24.78 0.0012
2014-08-13 2014-06-30 13F AMKOR TECHNOLOGY COM 031652100 175,400 46,772 36.36 1,961 122.34 0.0017
2014-05-13 2014-03-31 13F AMKOR TECHNOLOGY COM 031652100 128,628 -26,998 -17.35 882 -7.55 0.0008
2014-02-13 2013-12-31 13F AMKOR TECHNOLOGY COM 031652100 155,626 -1,569,296 -90.98 954 -87.11 0.0009
2013-11-14 2013-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,724,922 -4,235,613 -71.06 7,400 -70.51 0.0073
2013-08-13 2013-06-30 13F AMKOR TECHNOLOGY COM 031652100 5,960,535 5,960,535 25,094 0.0266
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.