Amkor Technology, Inc.
MX ˙ BMV ˙ US0316521006
SecurityMX:AMKR / Amkor Technology, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,372,808 shares
Latest Disclosed Value $ 61,817,646
Morgan Stanley reports 24.01% decrease in ownership of AMKR / Amkor Technology, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,372,808 shares of Amkor Technology, Inc. (MX:AMKR) valued at $61,817,646 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,806,649 shares of Amkor Technology, Inc.. This represents a change in shares of -24.01% 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 1,372,808 -433,841 -24.01 61,818 -13.33 0.0037
2026-05-27 2025-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,806,649 340,262 23.20 71,327 71.27 0.0043
2026-02-13 2025-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,806,649 340,262 71,327 0.0043
2026-05-27 2025-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,466,387 160,391 12.28 41,645 51.92 0.0025
2025-11-14 2025-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,466,387 160,391 41,645 0.0025
2025-08-15 2025-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,305,996 -97,390 -6.94 27,413 8.16 0.0018
2025-05-15 2025-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,403,386 101,028 7.76 25,345 -24.25 0.0018
2025-05-15 2024-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,302,358 145,180 12.55 33,458 -5.51 0.0023
2025-02-14 2024-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,302,358 145,180 33,458 0.0023
2025-05-14 2024-09-30 13F/A-2 AMKOR TECHNOLOGY COM 031652100 1,157,178 64,030 5.86 35,410 -19.06 0.0026
2025-02-14 2024-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,157,178 64,030 35,410 0.0026
2024-11-14 2024-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,157,178 64,030 35,410 0.0003
2025-05-14 2024-06-30 13F/A-2 AMKOR TECHNOLOGY COM 031652100 1,093,148 50,748 4.87 43,748 30.17 0.0034
2024-10-17 2024-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,093,148 50,748 43,748 0.0034
2024-08-14 2024-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,093,148 50,748 43,748 0.0034
2024-10-17 2024-03-31 13F/A-2 AMKOR TECHNOLOGY COM 031652100 1,042,400 -208,728 -16.68 33,607 -19.26 0.0027
2024-08-16 2024-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,042,400 -208,728 33,607 0.0003
2024-05-15 2024-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,042,400 -208,728 33,607 0.0027
2024-08-16 2023-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,251,128 -513,458 -29.10 41,625 4.38 0.0037
2024-02-13 2023-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,251,128 -513,458 41,625 0.0037
2023-11-15 2023-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,764,586 678,911 62.53 39,880 23.47 0.0041
2023-08-14 2023-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,085,675 47,120 4.54 32,299 19.52 0.0032
2023-05-15 2023-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,038,555 -45,352 -4.18 27,023 3.97 0.0029
2023-02-14 2022-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,083,907 30,961 2.94 25,992 44.78 0.0030
2022-11-14 2022-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,052,946 114,418 12.19 17,953 12.86 0.0024
2022-10-27 2022-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 938,528 585,872 166.13 15,907 107.66 0.0021
2022-08-15 2022-06-30 13F AMKOR TECHNOLOGY COM 031652100 938,528 585,872 15,907 0.0021
2022-10-27 2022-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 352,656 -190,861 -35.12 7,660 -43.15 0.0010
2022-05-13 2022-03-31 13F AMKOR TECHNOLOGY COM 031652100 352,656 -190,861 7,660 0.0010
2022-02-14 2021-12-31 13F AMKOR TECHNOLOGY COM 031652100 543,517 -194,226 -26.33 13,474 -26.80 0.0017
2021-11-15 2021-09-30 13F AMKOR TECHNOLOGY COM 031652100 737,743 -520,126 -41.35 18,406 -38.18 0.0025
2021-08-23 2021-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,257,869 878,500 231.57 29,774 231.01 0.0039
2021-08-16 2021-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,257,869 878,500 29,774 0.0039
2021-05-17 2021-03-31 13F AMKOR TECHNOLOGY COM 031652100 379,369 -686,111 -64.39 8,995 -44.02 0.0013
2021-02-16 2020-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,065,480 544,924 104.68 16,068 175.56 0.0025
2020-11-13 2020-09-30 13F AMKOR TECHNOLOGY COM 031652100 520,556 -186,840 -26.41 5,831 -33.03 0.0011
2020-08-14 2020-06-30 13F AMKOR TECHNOLOGY COM 031652100 707,396 -593,529 -45.62 8,707 -14.09 0.0019
2020-05-26 2020-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,300,925 438,819 50.90 10,135 -9.58 0.0028
2020-05-15 2020-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,300,925 438,819 10,135 778.5793
2020-02-14 2019-12-31 13F AMKOR TECHNOLOGY COM 031652100 862,106 801,191 1,315.26 11,209 1,923.29 0.0026
2019-11-14 2019-09-30 13F AMKOR TECHNOLOGY COM 031652100 60,915 18,639 44.09 554 75.32 0.0001
2019-08-14 2019-06-30 13F AMKOR TECHNOLOGY COM 031652100 42,276 -397 -0.93 316 -13.42 0.0001
2019-05-15 2019-03-31 13F AMKOR TECHNOLOGY COM 031652100 42,673 -296,880 -87.43 365 -83.61 0.0001
2019-02-14 2018-12-31 13F AMKOR TECHNOLOGY COM 031652100 339,553 -902,774 -72.67 2,227 -75.74 0.0007
2019-04-23 2018-09-30 13F/A-2 AMKOR TECHNOLOGY COM 031652100 1,242,327 270,746 27.87 9,181 10.02 0.0023
2018-11-20 2018-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,242,327 0 9,181 0.0023
2018-11-14 2018-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,242,327 270,746 9,181
2019-04-23 2018-06-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 971,581 -388,335 -28.56 8,345 -39.43 0.0023
2018-08-14 2018-06-30 13F AMKOR TECHNOLOGY COM 031652100 971,581 -388,335 8,345
2019-04-23 2018-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 1,359,916 1,122,934 473.85 13,777 478.38 0.0038
2018-05-14 2018-03-31 13F AMKOR TECHNOLOGY COM 031652100 1,359,916 1,122,934 13,777
2019-04-23 2017-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 236,982 66,767 39.23 2,382 32.63 0.0007
2018-02-14 2017-12-31 13F AMKOR TECHNOLOGY COM 031652100 236,982 66,767 2,382
2017-11-14 2017-09-30 13F AMKOR TECHNOLOGY COM 031652100 170,215 -136,934 -44.58 1,796 -40.15 0.0005
2017-08-11 2017-06-30 13F AMKOR TECHNOLOGY COM 031652100 307,149 -115,307 -27.29 3,001 -38.71 0.0009
2017-05-22 2017-03-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 422,456 -295,356 -41.15 4,896 -35.35 0.0015
2017-05-12 2017-03-31 13F AMKOR TECHNOLOGY COM 031652100 422,456 4,896
2017-02-22 2016-12-31 13F/A-1 AMKOR TECHNOLOGY COM 031652100 717,812 -420,888 -36.96 7,573 -31.57 0.0025
2017-02-13 2016-12-31 13F AMKOR TECHNOLOGY COM 031652100 717,812 7,573
2016-11-10 2016-09-30 13F AMKOR TECHNOLOGY COM 031652100 1,138,700 509,346 80.93 11,067 205.89 0.0038
2016-08-12 2016-06-30 13F AMKOR TECHNOLOGY COM 031652100 629,354 331,223 111.10 3,618 106.04 0.0013
2016-05-12 2016-03-31 13F AMKOR TECHNOLOGY COM 031652100 298,131 -682,348 -69.59 1,756 -70.54 0.0007
2016-02-09 2015-12-31 13F AMKOR TECHNOLOGY COM 031652100 980,479 139,704 16.62 5,961 57.95 0.0022
2016-02-08 2015-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 840,775 -679,216 -44.69 3,774 -58.48 0.0014
2015-11-09 2015-09-30 13F AMKOR TECHNOLOGY COM 031652100 840,775 3,774
2015-08-12 2015-06-30 13F AMKOR TECHNOLOGY COM 031652100 1,519,991 630,624 70.91 9,090 15.68 0.0032
2015-05-14 2015-03-31 13F AMKOR TECHNOLOGY COM 031652100 889,367 -222,728 -20.03 7,858 -0.48 0.0029
2015-02-13 2014-12-31 13F AMKOR TECHNOLOGY COM 031652100 1,112,095 576,311 107.56 7,896 75.19 0.0029
2014-12-16 2014-09-30 13F/A-1 AMKOR TECHNOLOGY COM 031652100 535,784 338,460 171.53 4,507 104.21 0.0017
2014-11-14 2014-09-30 13F AMKOR TECHNOLOGY COM 031652100 535,784 4,507
2014-08-12 2014-06-30 13F AMKOR TECHNOLOGY COM 031652100 197,324 17,895 9.97 2,207 79.43 0.0038
2014-05-13 2014-03-31 13F AMKOR TECHNOLOGY COM 031652100 179,429 -4,968 -2.69 1,230 8.85 0.0005
2014-02-13 2013-12-31 13F AMKOR TECHNOLOGY COM 031652100 184,397 8,304 4.72 1,130 49.87 0.0005
2013-11-13 2013-09-30 13F AMKOR TECHNOLOGY INC COM ST COM 031652100 176,093 -76,186 -30.20 754 -29.00 0.0004
2013-08-08 2013-06-30 13F AMKOR TECHNOLOGY INC COM ST COM 031652100 252,279 252,279 1,062 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.