Western Digital Corporation
US ˙ NasdaqGS ˙ US9581021055

SecurityWDC / Western Digital Corporation
InstitutionAviva Plc
Latest Disclosed Ownership307,992 shares
Latest Disclosed Value $ 83,308,756
Aviva Plc reports 0.88% increase in ownership of WDC / Western Digital Corporation

On May 14, 2026 - Aviva Plc filed a 13F-HR form disclosing ownership of 307,992 shares of Western Digital Corporation (US:WDC) valued at $83,308,756 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 305,308 shares of Western Digital Corporation. This represents a change in shares of 0.88% during the quarter. The current value of the position is $177,249,396 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)
2026-05-14 2026-03-31 13F WESTERN DIGITAL COM 958102105 307,992 2,684 0.88 83,309 58.40 0.1398
2026-02-12 2025-12-31 13F WESTERN DIGITAL COM 958102105 305,308 5,385 1.80 52,595 46.06 0.0887
2025-11-13 2025-09-30 13F WESTERN DIGITAL COM 958102105 299,923 33,757 12.68 36,009 111.43 0.0654
2025-08-07 2025-06-30 13F WESTERN DIGITAL COM 958102105 266,166 22,906 9.42 17,032 73.17 0.0352
2025-05-15 2025-03-31 13F WESTERN DIGITAL COM 958102105 243,260 36,575 17.70 9,835 -20.20 0.0237
2025-02-13 2024-12-31 13F WESTERN DIGITAL COM 958102105 206,685 125,251 153.81 12,325 121.61 0.0320
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 81,434 1,441 1.80 5,561 -8.25 0.0144
2024-08-02 2024-06-30 13F WESTERN DIGITAL COM 958102105 79,993 67,619 546.46 6,061 618.13 0.0168
2024-05-14 2024-03-31 13F WESTERN DIGITAL COM 958102105 12,374 426 3.57 844 35.04 0.0028
2024-02-09 2023-12-31 13F WESTERN DIGITAL COM 958102105 11,948 0 0.00 626 14.68 0.0022
2023-11-13 2023-09-30 13F WESTERN DIGITAL COM 958102105 11,948 -47 -0.39 545 20.04 0.0023
2023-08-10 2023-06-30 13F WESTERN DIGITAL COM 958102105 11,995 -138 -1.14 455 -0.66 0.0019
2023-05-12 2023-03-31 13F WESTERN DIGITAL COM 958102105 12,133 -34,123 -73.77 457 -68.68 0.0021
2023-02-14 2022-12-31 13F/A-2 WESTERN DIGITAL COM 958102105 46,256 2,997 6.93 1,459 3.62 0.0072
2023-02-10 2022-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 46,256 2,997 12,696 0.0605
2023-02-09 2022-12-31 13F WESTERN DIGITAL COM 958102105 46,256 2,997 1 0.0070
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 43,259 -19,972 -31.59 1,408 -50.34 0.0081
2022-08-04 2022-06-30 13F WESTERN DIGITAL COM 958102105 63,231 5,340 9.22 2,835 -1.36 0.0151
2022-05-13 2022-03-31 13F WESTERN DIGITAL COM 958102105 57,891 -36,078 -38.39 2,874 -53.10 0.0144
2022-02-10 2021-12-31 13F WESTERN DIGITAL COM 958102105 93,969 -11,539 -10.94 6,128 2.91 0.0257
2021-11-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 105,508 -5,198 -4.70 5,955 -24.42 0.0266
2021-08-10 2021-06-30 13F WESTERN DIGITAL COM 958102105 110,706 -1,792 -1.59 7,879 4.93 0.0346
2021-05-13 2021-03-31 13F WESTERN DIGITAL COM 958102105 112,498 1,238 1.11 7,509 21.84 0.0367
2021-02-10 2020-12-31 13F WESTERN DIGITAL COM 958102105 111,260 14,147 14.57 6,163 73.65 0.0321
2020-11-12 2020-09-30 13F WESTERN DIGITAL COM 958102105 97,113 -7,699 -7.35 3,549 -23.31 0.0209
2020-08-13 2020-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 104,812 266 0.25 4,628 6.37 0.0289
2020-08-13 2020-06-30 13F WESTERN DIGITAL COM 958102105 104,812 266 4,628 14,010.9409
2020-05-14 2020-03-31 13F WESTERN DIGITAL COM 958102105 104,546 986 0.95 4,351 -33.80 0.0319
2020-02-10 2019-12-31 13F WESTERN DIGITAL COM 958102105 103,560 378 0.37 6,573 6.81 0.0398
2019-11-12 2019-09-30 13F WESTERN DIGITAL COM 958102105 103,182 -4,038 -3.77 6,154 20.71 0.0417
2019-07-30 2019-06-30 13F WESTERN DIGITAL COM 958102105 107,220 -2,367 -2.16 5,098 -3.21 0.0350
2019-05-14 2019-03-31 13F WESTERN DIGITAL COM 958102105 109,587 -2,170 -1.94 5,267 27.47 0.0353
2019-02-12 2018-12-31 13F WESTERN DIGITAL COM 958102105 111,757 -40,323 -26.51 4,132 -53.59 0.0308
2018-11-13 2018-09-30 13F WESTERN DIGITAL COM 958102105 152,080 -13,894 -8.37 8,903 -30.71 0.0488
2018-08-01 2018-06-30 13F WESTERN DIGITAL COM 958102105 165,974 -1,832 -1.09 12,848 -17.02 0.0758
2018-05-14 2018-03-31 13F WESTERN DIGITAL COM 958102105 167,806 -13,729 -7.56 15,483 7.25 0.0947
2018-02-13 2017-12-31 13F WESTERN DIGITAL COM 958102105 181,535 -22,520 -11.04 14,437 -18.10 0.0817
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 204,055 1,850 0.91 17,628 -1.61 0.0949
2017-08-07 2017-06-30 13F WESTERN DIGITAL COM 958102105 202,205 15,860 8.51 17,917 16.49 0.1001
2017-05-15 2017-03-31 13F WESTERN DIGITAL COM 958102105 186,345 -8,744 -4.48 15,381 16.01 0.0880
2017-02-13 2016-12-31 13F WESTERN DIGITAL COM 958102105 195,089 32,856 20.25 13,258 39.79 0.0792
2016-11-14 2016-09-30 13F WESTERN DIGITAL COM 958102105 162,233 2,965 1.86 9,484 25.97 0.0592
2016-08-05 2016-06-30 13F WESTERN DIGITAL COM 958102105 159,268 48,006 43.15 7,529 43.25 0.0516
2016-05-12 2016-03-31 13F WESTERN DIGITAL COM 958102105 111,262 -9,356 -7.76 5,256 -27.43 0.0391
2016-02-11 2015-12-31 13F WESTERN DIGITAL COM 958102105 120,618 -731 -0.60 7,243 -24.87 0.0549
2015-11-12 2015-09-30 13F WESTERN DIGITAL COM 958102105 121,349 -3,068 -2.47 9,640 -1.19 0.0799
2015-08-06 2015-06-30 13F WESTERN DIGITAL COM 958102105 124,417 5,750 4.85 9,756 -9.67 0.0690
2015-05-14 2015-03-31 13F WESTERN DIGITAL COM 958102105 118,667 118,667 0.00 10,800 0.0740
2015-02-05 2014-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 0 -92,837 -100.00 0 -100.00
2014-11-13 2014-09-30 13F WESTERN DIGITAL COM 958102105 92,837 280 0.30 9,035 5.76 0.0715
2014-08-13 2014-06-30 13F WESTERN DIGITAL COM 958102105 92,557 -800 -0.86 8,543 -0.34 0.0653
2014-05-14 2014-03-31 13F WESTERN DIGITAL COM 958102105 93,357 6,640 7.66 8,572 17.81 0.0695
2014-02-13 2013-12-31 13F WESTERN DIGITAL COM 958102105 86,717 5,169 6.34 7,276 40.74 0.0608
2013-11-13 2013-09-30 13F WESTERN DIGITAL COM 958102105 81,548 14,925 22.40 5,170 24.97 0.0453
2013-08-01 2013-06-30 13F WESTERN DIGITAL COM 958102105 66,623 66,623 4,137 0.0418
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.