Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionPrincipal Financial Group Inc
Latest Disclosed Ownership676,042 shares
Latest Disclosed Value $ 182,868,006
Principal Financial Group Inc reports 31.90% decrease in ownership of 12355 / Western Digital Corporation

On May 4, 2026 - Principal Financial Group Inc filed a 13F-HR form disclosing ownership of 676,042 shares of Western Digital Corporation (CH:12355) valued at $182,868,006 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 992,731 shares of Western Digital Corporation. This represents a change in shares of -31.90% 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)
2026-05-04 2026-03-31 13F WESTERN DIGITAL COM 958102105 676,042 -316,689 -31.90 182,868 6.93 0.0977
2026-02-02 2025-12-31 13F WESTERN DIGITAL COM 958102105 992,731 175,668 21.50 171,025 74.34 0.0873
2025-11-04 2025-09-30 13F WESTERN DIGITAL COM 958102105 817,063 265,654 48.18 98,098 178.01 0.0495
2025-08-08 2025-06-30 13F WESTERN DIGITAL COM 958102105 551,409 159,749 40.79 35,285 122.84 0.0187
2025-04-28 2025-03-31 13F WESTERN DIGITAL COM 958102105 391,660 834 0.21 15,835 -32.05 0.0089
2025-01-31 2024-12-31 13F WESTERN DIGITAL COM 958102105 390,826 15,189 4.04 23,305 -9.15 0.0127
2024-10-31 2024-09-30 13F WESTERN DIGITAL COM 958102105 375,637 -136,704 -26.68 25,652 -33.92 0.0141
2024-07-29 2024-06-30 13F WESTERN DIGITAL COM 958102105 512,341 -231,742 -31.14 38,820 -23.55 0.0231
2024-04-29 2024-03-31 13F WESTERN DIGITAL COM 958102105 744,083 -52,701 -6.61 50,776 21.69 0.0298
2024-02-07 2023-12-31 13F WESTERN DIGITAL COM 958102105 796,784 91,901 13.04 41,728 29.74 0.0266
2023-11-02 2023-09-30 13F WESTERN DIGITAL COM 958102105 704,883 337,757 92.00 32,164 130.97 0.0231
2023-08-07 2023-06-30 13F WESTERN DIGITAL COM 958102105 367,126 -23,920 -6.12 13,925 -5.47 0.0095
2023-05-09 2023-03-31 13F WESTERN DIGITAL COM 958102105 391,046 9,431 2.47 14,731 22.35 0.0105
2023-02-09 2022-12-31 13F WESTERN DIGITAL COM 958102105 381,615 -8,190 -2.10 12,040 -5.12 0.0091
2022-11-09 2022-09-30 13F WESTERN DIGITAL COM 958102105 389,805 -4,432 -1.12 12,688 -28.21 0.0101
2022-08-10 2022-06-30 13F WESTERN DIGITAL COM 958102105 394,237 8,827 2.29 17,674 -7.64 0.0131
2022-05-09 2022-03-31 13F WESTERN DIGITAL COM 958102105 385,410 5,819 1.53 19,136 -22.69 0.0076
2022-05-09 2022-03-31 13F WESTERN DIGITAL COM 958102105 30,344 1,507
2022-02-09 2021-12-31 13F WESTERN DIGITAL COM 958102105 379,591 -7,924 -2.04 24,753 13.18 0.0148
2021-11-09 2021-09-30 13F WESTERN DIGITAL COM 958102105 387,515 -135,885 -25.96 21,871 -41.29 0.0143
2021-08-10 2021-06-30 13F WESTERN DIGITAL COM 958102105 523,400 152,512 41.12 37,251 50.47 0.0241
2021-05-10 2021-03-31 13F WESTERN DIGITAL COM 958102105 370,888 -26,616 -6.70 24,757 12.44 0.0175
2021-02-23 2020-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 397,504 -28,057 -6.59 22,018 41.56 0.0163
2021-02-08 2020-12-31 13F WESTERN DIGITAL COM 958102105 397,504 -28,057 22,018 8,662.2205
2020-11-06 2020-09-30 13F WESTERN DIGITAL COM 958102105 425,561 -21,553 -4.82 15,554 -21.21 0.0131
2020-08-05 2020-06-30 13F WESTERN DIGITAL COM 958102105 447,114 -96,700 -17.78 19,740 -12.79 0.0175
2020-05-12 2020-03-31 13F WESTERN DIGITAL COM 958102105 543,814 -29,727 -5.18 22,634 -37.82 0.0251
2020-02-05 2019-12-31 13F WESTERN DIGITAL COM 958102105 573,541 74,974 15.04 36,403 22.43 0.0303
2019-11-13 2019-09-30 13F WESTERN DIGITAL COM 958102105 498,567 63,280 14.54 29,734 43.66 0.0262
2019-08-12 2019-06-30 13F WESTERN DIGITAL COM 958102105 435,287 -185,589 -29.89 20,698 -30.63 0.0186
2019-05-10 2019-03-31 13F WESTERN DIGITAL COM 958102105 620,876 179,047 40.52 29,839 82.67 0.0278
2019-02-14 2018-12-31 13F WESTERN DIGITAL COM 958102105 441,829 -681 -0.15 16,335 -36.94 0.0174
2018-11-14 2018-09-30 13F WESTERN DIGITAL COM 958102105 442,510 -14,011 -3.07 25,905 -26.70 0.0228
2018-08-13 2018-06-30 13F WESTERN DIGITAL COM 958102105 456,521 -27,052 -5.59 35,339 -20.80 0.0325
2018-05-14 2018-03-31 13F WESTERN DIGITAL COM 958102105 483,573 -89,628 -15.64 44,619 -2.12 0.0429
2018-02-12 2017-12-31 13F WESTERN DIGITAL COM 958102105 573,201 -154,818 -21.27 45,587 -27.53 0.0420
2017-11-02 2017-09-30 13F WESTERN DIGITAL COM 958102105 728,019 94,615 14.94 62,901 12.09 0.0610
2017-08-08 2017-06-30 13F WESTERN DIGITAL COM 958102105 633,404 89,086 16.37 56,119 24.93 0.0562
2017-05-11 2017-03-31 13F WESTERN DIGITAL COM 958102105 544,318 73,866 15.70 44,922 40.53 0.0541
2017-02-13 2016-12-31 13F WESTERN DIGITAL COM 958102105 470,452 30,190 6.86 31,967 24.18 0.0405
2016-11-10 2016-09-30 13F WESTERN DIGITAL COM 958102105 440,262 10,887 2.54 25,742 26.86 0.0340
2016-08-09 2016-06-30 13F WESTERN DIGITAL COM 958102105 429,375 -319,017 -42.63 20,292 -42.60 0.0283
2016-05-10 2016-03-31 13F WESTERN DIGITAL COM 958102105 748,392 401,938 116.01 35,354 69.94 0.0513
2016-02-09 2015-12-31 13F WESTERN DIGITAL COM 958102105 346,454 4,683 1.37 20,804 -23.37 0.0309
2015-11-12 2015-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 341,771 -1,234,680 -78.32 27,150 -78.04 0.0427
2015-11-09 2015-09-30 13F WESTERN DIGITAL COM 958102105 341,771 27,150
2015-08-10 2015-06-30 13F WESTERN DIGITAL COM 958102105 1,576,451 -217,843 -12.14 123,626 -24.29 0.1844
2015-05-14 2015-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 1,794,294 -49,900 -2.71 163,297 -20.01 0.2433
2015-05-12 2015-03-31 13F WESTERN DIGITAL COM 958102105 1,794,294 163,299
2015-02-12 2014-12-31 13F WESTERN DIGITAL COM 958102105 1,844,194 26,533 1.46 204,152 15.41 0.3172
2014-11-13 2014-09-30 13F WESTERN DIGITAL COM 958102105 1,817,661 132,713 7.88 176,895 13.74 0.3001
2014-08-12 2014-06-30 13F WESTERN DIGITAL COM 958102105 1,684,948 64,319 3.97 155,521 4.51 0.2615
2014-05-13 2014-03-31 13F WESTERN DIGITAL COM 958102105 1,620,629 263,722 19.44 148,806 30.71 0.2655
2014-02-12 2013-12-31 13F WESTERN DIGITAL COM 958102105 1,356,907 28,202 2.12 113,844 35.14 0.2125
2013-11-05 2013-09-30 13F WESTERN DIGITAL COM 958102105 1,328,705 -220,920 -14.26 84,240 -12.45 0.1740
2013-08-12 2013-06-30 13F WESTERN DIGITAL COM 958102105 1,549,625 1,549,625 96,216 0.2131
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.