Western Digital Corporation
US ˙ NasdaqGS ˙ US9581021055

SecurityWDC / Western Digital Corporation
InstitutionShell Asset Management Co
Latest Disclosed Ownership3,262 shares
Latest Disclosed Value $ 392
Shell Asset Management Co reports 42.12% decrease in ownership of WDC / Western Digital Corporation

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 3,262 shares of Western Digital Corporation (US:WDC) valued at $391,636 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 5,636 shares of Western Digital Corporation. The current value of the position is $1,877,281 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)
2025-11-07 2025-09-30 13F WESTERN DIGITAL COM 958102105 3,262 -2,374 -42.12 0 0.0394
2025-07-23 2025-06-30 13F WESTERN DIGITAL COM 958102105 5,636 2,900 105.99 0 0.0125
2025-05-14 2025-03-31 13F WESTERN DIGITAL COM 958102105 2,736 0 0.00 0 0.0053
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 2,736 0 0.00 0 0.0071
2024-11-07 2024-09-30 13F WESTERN DIGITAL COM 958102105 2,736 -6,964 -71.79 0 0.0082
2024-07-25 2024-03-31 13F WESTERN DIGITAL COM 958102105 9,700 4,245 77.82 1 0.0335
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 5,455 -1,513 -21.71 0 0.0132
2023-11-08 2023-09-30 13F WESTERN DIGITAL COM 958102105 6,968 -159 -2.23 0 0.0131
2023-07-28 2023-06-30 13F WESTERN DIGITAL COM 958102105 7,127 -5,220 -42.28 0 0.0106
2023-05-15 2023-03-31 13F WESTERN DIGITAL COM 958102105 12,347 0 0.00 0 0.0193
2023-02-07 2022-12-31 13F WESTERN DIGITAL COM 958102105 12,347 -2,419 -16.38 0 -100.00 0.0171
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 14,766 -3,451 -18.94 481 -41.13 0.0187
2022-08-09 2022-06-30 13F WESTERN DIGITAL COM 958102105 18,217 -3,303 -15.35 817 -23.50 0.0242
2022-05-04 2022-03-31 13F WESTERN DIGITAL COM 958102105 21,520 -409 -1.87 1,068 -25.31 0.0252
2022-02-09 2021-12-31 13F WESTERN DIGITAL COM 958102105 21,929 4,892 28.71 1,430 48.65 0.0293
2021-11-04 2021-09-30 13F WESTERN DIGITAL COM 958102105 17,037 181 1.07 962 -19.83 0.0216
2021-08-12 2021-06-30 13F WESTERN DIGITAL COM 958102105 16,856 -1,168 -6.48 1,200 -0.25 0.0233
2021-05-10 2021-03-31 13F WESTERN DIGITAL COM 958102105 18,024 965 5.66 1,203 27.30 0.0241
2021-02-16 2020-12-31 13F WESTERN DIGITAL COM 958102105 17,059 6,439 60.63 945 143.56 0.0195
2020-11-13 2020-09-30 13F WESTERN DIGITAL COM 958102105 10,620 -60,309 -85.03 388 -87.61 0.0090
2020-08-10 2020-06-30 13F WESTERN DIGITAL COM 958102105 70,929 -5,909 -7.69 3,132 -2.06 0.0782
2020-05-11 2020-03-31 13F WESTERN DIGITAL COM 958102105 76,838 -62,478 -44.85 3,198 -63.83 0.0891
2020-02-13 2019-12-31 13F WESTERN DIGITAL COM 958102105 139,316 -56,274 -28.77 8,842 -24.20 0.1905
2019-11-12 2019-09-30 13F WESTERN DIGITAL COM 958102105 195,590 -3,891 -1.95 11,665 22.98 0.2664
2019-08-12 2019-06-30 13F WESTERN DIGITAL COM 958102105 199,481 -68,769 -25.64 9,485 -26.43 0.2099
2019-05-09 2019-03-31 13F WESTERN DIGITAL COM 958102105 268,250 0 0.00 12,892 30.00 0.2843
2019-02-13 2018-12-31 13F WESTERN DIGITAL COM 958102105 268,250 47,120 21.31 9,917 -23.39 0.2472
2018-11-13 2018-09-30 13F WESTERN DIGITAL COM 958102105 221,130 -4,034 -1.79 12,945 -25.73 0.2555
2018-08-10 2018-06-30 13F WESTERN DIGITAL COM 958102105 225,164 29,124 14.86 17,430 -3.64 0.3573
2018-05-14 2018-03-31 13F WESTERN DIGITAL COM 958102105 196,040 39,875 25.53 18,089 45.64 0.3602
2018-02-09 2017-12-31 13F WESTERN DIGITAL COM 958102105 156,165 5,698 3.79 12,420 -4.46 0.2465
2017-10-20 2017-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 150,467 -5,176 -3.33 13,000 -5.73 0.2891
2017-10-18 2017-09-30 13F WESTERN DIGITAL COM 958102105 35,267 -120,376 3,432
2017-07-26 2017-06-30 13F WESTERN DIGITAL COM 958102105 155,643 51,175 48.99 13,790 59.94 0.3422
2017-04-26 2017-03-31 13F WESTERN DIGITAL COM 958102105 104,468 85,275 444.30 8,622 561.20 0.2201
2017-01-10 2016-12-31 13F WESTERN DIGITAL COM 958102105 19,193 -3,565 -15.66 1,304 -2.03 0.0353
2016-10-28 2016-09-30 13F WESTERN DIGITAL COM 958102105 22,758 4,811 26.81 1,331 56.96 0.0319
2016-07-25 2016-06-30 13F WESTERN DIGITAL COM 958102105 17,947 5,557 44.85 848 44.96 0.0197
2016-05-11 2016-03-31 13F WESTERN DIGITAL COM 958102105 12,390 797 6.87 585 -15.95 0.0140
2016-02-05 2015-12-31 13F WESTERN DIGITAL COM 958102105 11,593 -23,674 -67.13 696 -79.72 0.0164
2015-10-13 2015-09-30 13F WESTERN DIGITAL COM 958102105 35,267 17,746 101.28 3,432 149.78 0.0544
2015-07-30 2015-06-30 13F WESTERN DIGITAL COM 958102105 17,521 -2,356 -11.85 1,374 -24.05 0.0275
2015-05-07 2015-03-31 13F WESTERN DIGITAL COM 958102105 19,877 19,877 0.00 1,809 0.0315
2015-02-04 2014-12-31 13F WESTERN DIGITAL COM 958102105 0 -35,267 -100.00 0 -100.00
2014-10-24 2014-09-30 13F WESTERN DIGITAL COM 958102105 35,267 -8 -0.02 3,432 5.41 0.0533
2014-08-08 2014-06-30 13F WESTERN DIGITAL COM 958102105 35,275 -2,013 -5.40 3,256 -4.91 0.0502
2014-05-07 2014-03-31 13F WESTERN DIGITAL COM 958102105 37,288 2,263 6.46 3,424 16.50 0.0569
2014-02-03 2013-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 35,025 -24,930 -41.58 2,939 -22.68 0.0500
2014-01-27 2013-12-31 13F WESTERN DIGITAL COM 958102105 35,025 2,939
2013-10-28 2013-09-30 13F WESTERN DIGITAL COM 958102105 59,955 2,578 4.49 3,801 6.68 0.0698
2013-08-01 2013-06-30 13F WESTERN DIGITAL COM 958102105 57,377 57,377 3,563 0.0678
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.