Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionProShare Advisors LLC
Latest Disclosed Ownership501,292 shares
Latest Disclosed Value $ 135,594,474
ProShare Advisors LLC reports 18.89% decrease in ownership of WDC / Western Digital Corporation

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 501,292 shares of Western Digital Corporation (MX:WDC) valued at $135,594,474 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 618,061 shares of Western Digital Corporation. This represents a change in shares of -18.89% 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)
2026-04-24 2026-03-31 13F WESTERN DIGITAL COM 958102105 501,292 -116,769 -18.89 135,594 27.35 0.2008
2026-02-06 2025-12-31 13F WESTERN DIGITAL COM 958102105 618,061 527,359 581.42 106,473 877.80 0.1879
2025-11-06 2025-09-30 13F WESTERN DIGITAL COM 958102105 90,702 -5,988 -6.19 10,890 76.00 0.0228
2025-08-07 2025-06-30 13F WESTERN DIGITAL COM 958102105 96,690 6,026 6.65 6,187 68.81 0.0123
2025-05-08 2025-03-31 13F WESTERN DIGITAL COM 958102105 90,664 5,875 6.93 3,666 -27.50 0.0083
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 84,789 -65,845 -43.71 5,056 -50.86 0.0116
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 150,634 73,192 94.51 10,287 75.32 0.0252
2024-08-13 2024-06-30 13F WESTERN DIGITAL COM 958102105 77,442 21,890 39.40 5,868 54.80 0.0157
2024-05-08 2024-03-31 13F WESTERN DIGITAL COM 958102105 55,552 -1,659 -2.90 3,791 26.50 0.0101
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 57,211 -2,997 -4.98 2,996 9.06 0.0092
2023-11-13 2023-09-30 13F WESTERN DIGITAL COM 958102105 60,208 -1,803 -2.91 2,747 16.79 0.0086
2023-08-10 2023-06-30 13F WESTERN DIGITAL COM 958102105 62,011 3,608 6.18 2,352 6.91 0.0068
2023-05-26 2023-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 58,403 -16,258 -21.78 2,200 -6.58 0.0067
2023-05-12 2023-03-31 13F WESTERN DIGITAL COM 958102105 58,403 -16,258 2,200 0.0070
2023-02-02 2022-12-31 13F WESTERN DIGITAL COM 958102105 74,661 7,116 10.54 2,356 7.09 0.0083
2022-11-07 2022-09-30 13F WESTERN DIGITAL COM 958102105 67,545 -6,830 -9.18 2,199 -34.08 0.0084
2022-08-01 2022-06-30 13F WESTERN DIGITAL COM 958102105 74,375 -24,771 -24.98 3,336 -32.22 0.0111
2022-05-10 2022-03-31 13F WESTERN DIGITAL COM 958102105 99,146 12,940 15.01 4,922 -12.44 0.0106
2022-02-08 2021-12-31 13F WESTERN DIGITAL COM 958102105 86,206 21,971 34.20 5,621 55.06 0.0110
2021-11-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 64,235 6,079 10.45 3,625 -12.42 0.0102
2021-08-13 2021-06-30 13F WESTERN DIGITAL COM 958102105 58,156 4,351 8.09 4,139 15.26 0.0121
2021-05-14 2021-03-31 13F WESTERN DIGITAL COM 958102105 53,805 2,878 5.65 3,591 27.30 0.0113
2021-02-09 2020-12-31 13F WESTERN DIGITAL COM 958102105 50,927 -205,874 -80.17 2,821 -69.94 0.0105
2020-11-13 2020-09-30 13F WESTERN DIGITAL COM 958102105 256,801 39,408 18.13 9,386 -2.21 0.0434
2020-08-03 2020-06-30 13F WESTERN DIGITAL COM 958102105 217,393 33,645 18.31 9,598 25.50 0.0513
2020-05-15 2020-03-31 13F WESTERN DIGITAL COM 958102105 183,748 -72,282 -28.23 7,648 -52.94 0.0550
2020-02-12 2019-12-31 13F WESTERN DIGITAL COM 958102105 256,030 33,906 15.26 16,250 22.67 0.0752
2019-11-12 2019-09-30 13F WESTERN DIGITAL COM 958102105 222,124 12,945 6.19 13,247 33.19 0.0742
2019-08-13 2019-06-30 13F WESTERN DIGITAL COM 958102105 209,179 -15,075 -6.72 9,946 -7.72 0.0595
2019-05-15 2019-03-31 13F WESTERN DIGITAL COM 958102105 224,254 -6,463 -2.80 10,778 26.35 0.0645
2019-02-14 2018-12-31 13F WESTERN DIGITAL COM 958102105 230,717 32,386 16.33 8,530 -26.53 0.0597
2018-11-14 2018-09-30 13F WESTERN DIGITAL COM 958102105 198,331 -23,375 -10.54 11,610 -32.35 0.0788
2018-08-13 2018-06-30 13F WESTERN DIGITAL COM 958102105 221,706 -16,644 -6.98 17,162 -21.97 0.1150
2018-05-14 2018-03-31 13F WESTERN DIGITAL COM 958102105 238,350 39,365 19.78 21,993 38.98 0.1433
2018-02-14 2017-12-31 13F WESTERN DIGITAL COM 958102105 198,985 61,753 45.00 15,825 33.47 0.1098
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 137,232 21,033 18.10 11,857 15.17 0.1090
2017-08-11 2017-06-30 13F WESTERN DIGITAL COM 958102105 116,199 20,089 20.90 10,295 29.79 0.1026
2017-05-12 2017-03-31 13F/A-2 WESTERN DIGITAL COM 958102105 96,110 -1,823 -1.86 7,932 19.19 0.0830
2017-05-08 2017-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 96,110 0 7,932 0.0829
2017-04-25 2017-03-31 13F WESTERN DIGITAL COM 958102105 96,110 7,932
2017-02-13 2016-12-31 13F WESTERN DIGITAL COM 958102105 97,933 25,647 35.48 6,655 57.44 0.0737
2016-11-10 2016-09-30 13F WESTERN DIGITAL COM 958102105 72,286 -46,058 -38.92 4,227 -24.42 0.0590
2016-08-12 2016-06-30 13F WESTERN DIGITAL COM 958102105 118,344 16,089 15.73 5,593 15.77 0.0720
2016-05-06 2016-03-31 13F WESTERN DIGITAL COM 958102105 102,255 -18,012 -14.98 4,831 -33.11 0.0665
2016-02-05 2015-12-31 13F WESTERN DIGITAL COM 958102105 120,267 5,226 4.54 7,222 -20.98 0.0875
2015-11-06 2015-09-30 13F WESTERN DIGITAL COM 958102105 115,041 17,722 18.21 9,139 19.75 0.1284
2015-08-11 2015-06-30 13F WESTERN DIGITAL COM 958102105 97,319 -27,014 -21.73 7,632 -32.56 0.1056
2015-05-08 2015-03-31 13F WESTERN DIGITAL COM 958102105 124,333 124,333 0.00 11,316 0.1333
2015-01-30 2014-12-31 13F WESTERN DIGITAL COM 958102105 0 -105,692 -100.00 0 -100.00
2014-11-06 2014-09-30 13F WESTERN DIGITAL COM 958102105 105,692 16,659 18.71 10,286 25.16 0.1364
2014-08-08 2014-06-30 13F WESTERN DIGITAL COM 958102105 89,033 -10,883 -10.89 8,218 -10.42 0.1065
2014-05-07 2014-03-31 13F WESTERN DIGITAL COM 958102105 99,916 8,947 9.84 9,174 20.20 0.1147
2014-02-04 2013-12-31 13F WESTERN DIGITAL COM 958102105 90,969 39,630 77.19 7,632 134.47 0.1137
2013-11-07 2013-09-30 13F WESTERN DIGITAL COM 958102105 51,339 -31,374 -37.93 3,255 -36.62 0.0773
2013-07-25 2013-06-30 13F WESTERN DIGITAL COM 958102105 82,713 82,713 5,136 0.1008
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.