Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionTwo Sigma Advisers, Lp
Latest Disclosed Ownership135,400 shares
Latest Disclosed Value $ 5,345,592
Two Sigma Advisers, Lp reports 802.67% increase in ownership of AMKR / Amkor Technology, Inc.

On February 17, 2026 - Two Sigma Advisers, Lp filed a 13F-HR form disclosing ownership of 135,400 shares of Amkor Technology, Inc. (MX:AMKR) valued at $5,345,592 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 15,000 shares of Amkor Technology, Inc.. This represents a change in shares of 802.67% 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)
2026-02-17 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 135,400 120,400 802.67 5,346 1,154.69 0.0104
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 15,000 15,000 426 0.0009
2025-05-15 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -16,000 -100.00 0 -100.00
2025-02-14 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 16,000 -16,400 -50.62 411 -58.53 0.0010
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 32,400 -32,100 -49.77 991 -61.60 0.0023
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 64,500 -83,500 -56.42 2,581 -45.90 0.0058
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 148,000 -23,300 -13.60 4,772 -16.28 0.0111
2024-02-14 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 171,300 -42,900 -20.03 5,699 17.75 0.0133
2023-11-14 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 214,200 96,200 81.53 4,841 37.89 0.0124
2023-08-14 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 118,000 -39,400 -25.03 3,510 -14.29 0.0089
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 157,400 49,300 45.61 4,096 57.99 0.0106
2023-02-14 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 108,100 7,800 7.78 2,592 51.58 0.0072
2022-11-14 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 100,300 83,800 507.88 1,710 510.71 0.0050
2022-08-15 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 16,500 4,600 38.66 280 8.53 0.0008
2022-05-16 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 11,900 11,900 258 0.0007
2022-02-14 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 0 -113,185 -100.00 0 -100.00
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 113,185 -101,700 -47.33 2,824 -44.48 0.0073
2021-08-16 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 214,885 -102,500 -32.30 5,086 -32.41 0.0134
2021-05-17 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 317,385 -176,500 -35.74 7,525 1.03 0.0207
2021-02-16 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 493,885 -187,700 -27.54 7,448 -2.44 0.0199
2020-11-16 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 681,585 53,250 8.47 7,634 -1.31 0.0218
2020-09-15 2020-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 628,335 -54,600 -7.99 7,735 45.39 0.0227
2020-08-14 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 628,335 -54,600 7,735 22,351.5811
2020-05-15 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 682,935 15,500 2.32 5,320 -38.69 0.0204
2020-02-14 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 667,435 26,700 4.17 8,677 48.81 0.0201
2019-11-14 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 640,735 -66,000 -9.34 5,831 10.60 0.0143
2019-08-14 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 706,735 -29,388 -3.99 5,272 -16.13 0.0131
2019-05-15 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 736,123 -299,600 -28.93 6,286 -7.48 0.0159
2019-02-14 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,035,723 50,000 5.07 6,794 -6.73 0.0186
2018-11-14 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 985,723 -105,200 -9.64 7,284 -22.27 0.0178
2018-08-14 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,090,923 -129,200 -10.59 9,371 -24.18 0.0252
2018-05-15 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,220,123 96,160 8.56 12,360 9.42 0.0335
2018-02-14 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,123,963 -205,779 -15.48 11,296 -19.48 0.0305
2017-11-14 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,329,742 -245,930 -15.61 14,029 -8.87 0.0398
2017-08-14 2017-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,575,672 -53,756 -3.30 15,394 -18.49 0.0508
2017-05-15 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,629,428 296,142 22.21 18,885 34.26 0.0619
2017-02-14 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,333,286 728,093 120.31 14,066 139.14 0.0538
2016-11-14 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 605,193 290,100 92.07 5,882 224.61 0.0251
2016-08-15 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 315,093 -38,800 -10.96 1,812 -13.05 0.0092
2016-05-16 2016-03-31 13F AMKOR TECHNOLOGY COM 031652100 353,893 -46,143 -11.53 2,084 -14.31 0.0117
2016-02-16 2015-12-31 13F AMKOR TECHNOLOGY COM 031652100 400,036 103,243 34.79 2,432 76.36 0.0145
2015-11-16 2015-09-30 13F AMKOR TECHNOLOGY COM 031652100 296,793 126,496 74.28 1,379 35.46 0.0087
2016-02-09 2015-06-30 13F/A-1 AMKOR TECHNOLOGY COMMON STOCK 031652100 170,297 -27,896 -14.08 1,018 -41.86 0.0078
2015-08-14 2015-06-30 13F AMKOR TECHNOLOGY COMMON STOCK 031652100 133,797 800
2016-02-09 2015-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 198,193 187,400 1,736.31 1,751 2,174.03 0.0134
2015-05-15 2015-03-31 13F AMKOR TECHNOLOGY COM 031652100 162,793 1,437
2016-02-09 2014-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 10,793 -145,992 -93.12 77 -94.16 0.0006
2015-02-17 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 10,793 77
2016-02-09 2014-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 156,785 -10,100 -6.05 1,319 -29.31 0.0104
2014-11-14 2014-09-30 13F AMKOR TECHNOLOGY COM 031652100 153,985 1,295
2016-02-09 2014-06-30 13F/A-1 AMKOR TECHNOLOGY COMMON STOCK 031652100 166,885 96,000 135.43 1,866 283.95 0.0150
2014-08-14 2014-06-30 13F AMKOR TECHNOLOGY COMMON STOCK 031652100 158,985 1,778
2014-05-15 2014-03-31 13F AMKOR TECHNOLOGY COMMON STOCK 031652100 70,885 70,885 486 0.0044
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.