Amkor Technology, Inc.
US ˙ NasdaqGS ˙ US0316521006

SecurityAMKR / Amkor Technology, Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership148,561 shares
Latest Disclosed Value $ 6,689,703
Engineers Gate Manager LP reports 88.86% increase in ownership of AMKR / Amkor Technology, Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 148,561 shares of Amkor Technology, Inc. (US:AMKR) valued at $6,689,702 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 78,661 shares of Amkor Technology, Inc.. This represents a change in shares of 88.86% during the quarter. The current value of the position is $11,171,787 USD.

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 148,561 69,900 88.86 6,690 115.43 0.0836
2026-02-17 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 78,661 -27,190 -25.69 3,106 3.29 0.0368
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 105,851 -17,442 -14.15 3,006 16.20 0.0344
2025-08-14 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 123,293 36,206 41.57 2,588 64.57 0.0322
2025-05-15 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 87,087 26,253 43.16 1,573 0.64 0.0265
2025-02-14 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 60,834 60,834 1,563 0.0272
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 0 -5,947 -100.00 0 -100.00
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 5,947 -15,811 -72.67 238 -66.19 0.0054
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 21,758 -10,498 -32.55 701 -34.67 0.0185
2024-02-14 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 32,256 -21,673 -40.19 1,073 -11.90 0.0306
2023-11-14 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 53,929 40,357 297.35 1,219 202.23 0.0451
2023-08-14 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 13,572 13,572 404 0.0153
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -27,916 -100.00 0 -100.00
2023-02-14 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 27,916 27,916 669 0.0402
2022-02-14 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 0 -51,797 -100.00 0 -100.00
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 51,797 26,280 102.99 1,292 113.91 0.0736
2021-08-16 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 25,517 13,292 108.73 604 108.28 0.0388
2021-05-17 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 12,225 -32,267 -72.52 290 -56.78 0.0144
2021-02-16 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 44,492 -7,774 -14.87 671 14.70 0.0291
2020-11-16 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 52,266 29,194 126.53 585 105.99 0.0274
2020-08-17 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 23,072 -15,282 -39.84 284 -5.02 0.0145
2020-05-15 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 38,354 -125,105 -76.54 299 -85.93 0.0215
2020-02-14 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 163,459 163,459 2,125 0.0934
2019-11-14 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 0 -123,539 -100.00 0 -100.00
2019-08-14 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 123,539 3,821 3.19 922 -9.78 0.0509
2019-05-15 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 119,718 -19,449 -13.98 1,022 11.94 0.0619
2019-02-14 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 139,167 93,825 206.93 913 172.54 0.0731
2018-11-01 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 45,342 45,342 335 0.0257
2018-08-03 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 0 -66,603 -100.00 0 -100.00
2018-05-07 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 66,603 -30,935 -31.72 675 -31.12 0.0450
2018-02-01 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 97,538 45,349 86.89 980 77.86 0.0673
2017-11-13 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 52,189 52,189 551 0.0464
2017-05-05 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -162,674 -100.00 0 -100.00
2017-02-10 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 162,674 59,148 57.13 1,716 70.58 0.1841
2016-11-09 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 103,526 78,541 314.35 1,006 598.61 0.1048
2016-08-11 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 24,985 24,985 0.00 144 0.0103
2015-05-15 2015-03-31 13F AMKOR TECHNOLOGY COM 031652100 0 -28,857 -100.00 0 -100.00
2015-02-17 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 28,857 28,857 205 0.0584
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.