Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionNorges Bank
Latest Disclosed Ownership4,578,446 shares
Latest Disclosed Value $ 788,728,892
Norges Bank ownership in WDC / Western Digital Corporation

On February 10, 2026 - Norges Bank filed a 13F-HR form disclosing ownership of 4,578,446 shares of Western Digital Corporation (MX:WDC) valued at $788,728,892 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 0 shares of Western Digital Corporation.

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)
2026-02-10 2025-12-31 13F WESTERN DIGITAL COM 958102105 4,578,446 4,578,446 788,729 0.0844
2025-11-13 2025-09-30 13F WESTERN DIGITAL COM 958102105 0 -3,448,666 -100.00 0 -100.00
2025-08-13 2025-06-30 13F WESTERN DIGITAL COM 958102105 3,448,666 -1,586,145 -31.50 220,680 8.41 0.0275
2026-05-11 2025-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 5,034,811 -877,857 -14.85 203,557 -42.27 0.0286
2025-02-12 2024-12-31 13F WESTERN DIGITAL COM 958102105 5,912,668 104,216 1.79 352,572 -11.11 0.0463
2025-11-12 2024-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 5,808,452 -63,611 -1.08 396,659 -10.85 0.0554
2024-08-14 2024-06-30 13F WESTERN DIGITAL COM 958102105 5,872,063 325,462 5.87 444,926 17.55 0.0665
2025-05-14 2024-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 5,546,601 2,664,076 92.42 378,500 150.73 0.0597
2024-02-09 2023-12-31 13F WESTERN DIGITAL COM 958102105 2,882,525 134,852 4.91 150,958 20.40 0.0264
2024-11-13 2023-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,747,673 -29,905 -1.08 125,376 19.01 0.0254
2024-08-14 2023-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,777,578 226,075 8.86 105,354 9.61 0.0208
2024-05-15 2023-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,551,503 -271,767 -9.63 96,115 7.90 0.0210
2023-02-14 2022-12-31 13F WESTERN DIGITAL COM 958102105 2,823,270 -16,240 -0.57 89,074 -3.63 0.0215
2023-11-13 2022-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,839,510 34,983 1.25 92,426 -26.49 0.0246
2023-08-14 2022-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,804,527 -273,860 -8.90 125,727 -17.74 0.0325
2023-05-12 2022-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,078,387 -30,141 -0.97 152,842 -24.60 0.0333
2022-03-09 2021-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,108,528 50,828 1.66 202,707 17.46 0.0417
2022-11-14 2021-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,057,700 -97,329 -3.08 172,577 -23.14 0.0382
2022-08-15 2021-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,155,029 -34,103 -1.07 224,543 5.48 0.0487
2022-05-09 2021-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,189,132 21,386 0.68 212,875 21.32 0.0487
2021-03-02 2020-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,167,746 188,820 6.34 175,461 61.15 0.0410
2021-11-12 2020-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,978,926 -68,254 -2.24 108,880 -19.07 0.0289
2021-08-13 2020-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,047,180 43,574 1.45 134,533 7.62 0.0387
2021-05-07 2020-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,003,606 -31,608 -1.04 125,010 -35.11 0.0445
2020-03-03 2019-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,035,214 44,861 1.50 192,645 8.02 0.0538
2020-11-13 2019-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,990,353 -58,004 -1.90 178,344 23.04 0.0546
2020-08-13 2019-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,048,357 0 0.00 144,948 -1.06 0.0448
2020-05-11 2019-03-31 13F/A-2 WESTERN DIGITAL COM 958102105 3,048,357 0 0.00 146,504 30.00 0.0473
2019-03-04 2018-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,048,357 -19,910 -0.65 112,698 -37.26 0.0419
2019-12-02 2018-09-30 13F/A-3 WESTERN DIGITAL COM 958102105 3,068,267 194,898 6.78 179,617 -19.25 0.0583
2019-12-02 2018-09-30 13F/A-2 WESTERN DIGITAL COM 958102105 3,068,267 194,898 179,617 0.0583
2019-11-12 2018-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,068,267 194,898 179,617 0.0583
2019-08-12 2018-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,873,369 436,770 17.93 222,427 -1.07 0.0764
2019-05-15 2018-03-31 13F/A-2 WESTERN DIGITAL COM 958102105 2,436,599 -421,184 -14.74 224,825 -1.08 0.0813
2018-03-05 2017-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,857,783 213,102 8.06 227,280 -0.53 0.0815
2018-11-13 2017-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,644,681 180,614 7.33 228,501 4.67 0.0867
2018-07-24 2017-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,464,067 0 0.00 218,316 7.35 0.0867
2018-05-11 2017-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,464,067 -12,812 -0.52 203,360 20.83 0.0834
2017-03-02 2016-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,476,879 -423,955 -14.61 168,304 3.89 0.0736
2017-11-13 2016-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,900,834 142,294 5.16 161,998 24.26 0.0766
2017-08-09 2016-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,758,540 583,432 26.82 130,369 26.88 0.0619
2017-05-10 2016-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,175,108 -10,544 -0.48 102,752 -21.71 0.0505
2016-04-18 2015-12-31 13F/A-2 WESTERN DIGITAL COM 958102105 2,185,652 48,181 2.25 131,249 -22.70 0.0652
2016-03-16 2015-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,185,652 0 131,249 0.0658
2016-11-14 2015-09-30 13F/A-2 WESTERN DIGITAL COM 958102105 2,137,471 -44,813 -2.05 169,801 -0.78 0.0890
2016-08-12 2015-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,182,284 0 0.00 171,134 -13.83 0.0855
2016-05-13 2015-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,182,284 97,940 4.70 198,609 -13.92 0.0973
2015-03-19 2014-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,084,344 -934,745 230,736 0.1177
2016-04-18 2014-12-31 13F/A-2 WESTERN DIGITAL COM 958102105 2,084,344 -934,745 -30.96 230,736 -21.47 0.1172
2015-11-12 2014-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,019,089 -100,000 -3.21 293,817 2.06 0.1592
2015-08-10 2014-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,119,089 -482,200 -13.39 287,893 -12.94 0.1553
2015-05-12 2014-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,601,289 -773,237 -17.68 330,670 -9.90 0.1866
2014-03-07 2013-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 4,374,526 240,029 367,022 0.2245
2014-03-20 2013-12-31 13F/A-2 WESTERN DIGITAL COM 958102105 4,374,526 0 367,022 0.2159
2014-05-12 2013-12-31 13F/A-3 WESTERN DIGITAL COM 958102105 4,374,526 240,029 5.81 367,022 40.02 0.2114
2014-11-14 2013-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 4,134,497 96,774 2.40 262,127 4.56 0.1530
2014-08-14 2013-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 4,037,723 900,332 28.70 250,702 58.93 0.1557
2014-04-04 2013-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,137,391 -1,042,545 157,748 0.1045
2014-05-12 2013-03-31 13F/A-2 WESTERN DIGITAL COM 958102105 3,137,391 -1,042,545 -24.94 157,748 -6.25 0.1023
2013-11-14 2012-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 4,179,936 2,095,152 100.50 168,261 102.94 0.1134
2013-08-15 2012-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 2,084,784 2,084,784 82,912 0.0665
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.