Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionJacobs Levy Equity Management, Inc
Latest Disclosed Ownership37,868 shares
Latest Disclosed Value $ 1,705,196
Jacobs Levy Equity Management, Inc reports 89.86% decrease in ownership of AMKR / Amkor Technology, Inc.

On May 15, 2026 - Jacobs Levy Equity Management, Inc filed a 13F-HR form disclosing ownership of 37,868 shares of Amkor Technology, Inc. (MX:AMKR) valued at $1,705,196 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 373,356 shares of Amkor Technology, Inc.. This represents a change in shares of -89.86% 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 37,868 -335,488 -89.86 1,705 -88.43 0.0072
2026-02-13 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 373,356 -106,494 -22.19 14,740 8.17 0.0569
2025-11-17 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 479,850 -1,200,455 -71.44 13,628 -61.36 0.0541
2025-08-14 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,680,305 253,790 17.79 35,270 36.90 0.1383
2025-05-15 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,426,515 751,730 111.40 25,763 48.61 0.1022
2025-02-14 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 674,785 354,457 110.65 17,335 76.85 0.0613
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 320,328 71,625 28.80 9,802 -1.52 0.0378
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 248,703 -62,524 -20.09 9,953 -0.80 0.0412
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 311,227 311,227 10,034 0.0448
2022-11-15 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 0 -70,282 -100.00 0 -100.00
2022-08-15 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 70,282 2,353 3.46 1,191 -19.25 0.0092
2022-05-16 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 67,929 142 0.21 1,475 -12.20 0.0099
2022-02-14 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 67,787 -78,543 -53.68 1,680 -53.99 0.0112
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 146,330 -240,292 -62.15 3,651 -60.10 0.0246
2021-08-16 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 386,622 -574,201 -59.76 9,151 -59.83 0.0620
2021-05-17 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 960,823 -28,951 -2.93 22,781 52.63 0.1757
2021-02-16 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 989,774 438,639 79.59 14,926 141.79 0.1309
2020-11-16 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 551,135 114,567 26.24 6,173 14.87 0.0640
2020-08-17 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 436,568 270,085 162.23 5,374 314.34 0.0582
2020-05-15 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 166,483 166,483 1,297 0.0167
2020-02-14 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 0 -53,800 -100.00 0 -100.00
2019-11-14 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 53,800 -373,537 -87.41 490 -84.63 0.0060
2019-08-13 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 427,337 65,510 18.11 3,188 3.17 0.0441
2019-05-14 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 361,827 132,451 57.74 3,090 105.32 0.0446
2019-02-14 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 229,376 -100,467 -30.46 1,505 -38.27 0.0265
2018-11-14 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 329,843 295,443 858.85 2,438 726.44 0.0346
2018-08-14 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 34,400 5,000 17.01 295 -1.01 0.0046
2018-05-15 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 29,400 -19,771 -40.21 298 -39.68 0.0050
2018-02-13 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 49,171 49,171 494 0.0087
2017-11-09 2017-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 0 -11,270 -100.00 0 -100.00
2017-05-12 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 11,270 -16,030 -58.72 131 -54.51 0.0026
2017-02-14 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 27,300 -409,538 -93.75 288 -93.22 0.0056
2016-11-14 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 436,838 402,838 1,184.82 4,246 2,066.33 0.0758
2016-08-15 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 34,000 34,000 0.00 196 0.0041
2015-11-16 2015-09-30 13F AMKOR TECHNOLOGY COM 031652100 0 -353,845 -100.00 0 -100.00
2015-08-14 2015-06-30 13F AMKOR TECHNOLOGY COM 031652100 353,845 50,000 16.46 2,116 -21.16 0.0402
2015-05-15 2015-03-31 13F AMKOR TECHNOLOGY COM 031652100 303,845 225,350 287.09 2,684 381.87 0.0457
2015-02-17 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 78,495 78,495 0.00 557 0.0095
2014-08-14 2014-06-30 13F AMKOR TECHNOLOGY COM 031652100 0 -105,492 -100.00 0 -100.00
2014-05-15 2014-03-31 13F AMKOR TECHNOLOGY COM 031652100 105,492 105,492 11.16 724 81.00 0.0121
2013-11-14 2013-09-30 13F AMKOR TECHNOLOGY COM 031652100 0 -94,900 -100.00 0 -100.00
2013-08-14 2013-06-30 13F AMKOR TECHNOLOGY COM 031652100 94,900 94,900 400 0.0071
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.