Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership3,606,563 shares
Latest Disclosed Value $ 975,539,227
Northern Trust Corp reports 1.78% decrease in ownership of WDC / Western Digital Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 3,606,563 shares of Western Digital Corporation (MX:WDC) valued at $975,539,227 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,671,955 shares of Western Digital Corporation. This represents a change in shares of -1.78% 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)
2026-05-14 2026-03-31 13F WESTERN DIGITAL COM 958102105 3,606,563 -65,392 -1.78 975,539 54.22 0.0264
2026-02-17 2025-12-31 13F WESTERN DIGITAL COM 958102105 3,671,955 -133,508 -3.51 632,568 38.45 0.0806
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 3,805,463 384,103 11.23 456,884 108.69 0.0584
2025-08-13 2025-06-30 13F WESTERN DIGITAL COM 958102105 3,421,360 -28,451 -0.82 218,933 56.97 0.0301
2025-05-13 2025-03-31 13F WESTERN DIGITAL COM 958102105 3,449,811 52,140 1.53 139,476 -31.16 0.0207
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 3,397,671 478,269 16.38 202,603 1.62 0.0287
2024-11-13 2024-09-30 13F WESTERN DIGITAL COM 958102105 2,919,402 -89,818 -2.98 199,366 -12.56 0.0326
2024-08-14 2024-06-30 13F WESTERN DIGITAL COM 958102105 3,009,220 -13,648 -0.45 228,009 10.53 0.0384
2024-05-14 2024-03-31 13F WESTERN DIGITAL COM 958102105 3,022,868 -60,327 -1.96 206,281 27.75 0.0356
2024-02-13 2023-12-31 13F WESTERN DIGITAL COM 958102105 3,083,195 -185,569 -5.68 161,467 8.26 0.0292
2023-11-13 2023-09-30 13F WESTERN DIGITAL COM 958102105 3,268,764 92,009 2.90 149,154 23.78 0.0289
2023-08-11 2023-06-30 13F WESTERN DIGITAL COM 958102105 3,176,755 -83,561 -2.56 120,494 -1.89 0.0232
2023-05-15 2023-03-31 13F WESTERN DIGITAL COM 958102105 3,260,316 21,675 0.67 122,816 20.20 0.0243
2023-02-13 2022-12-31 13F WESTERN DIGITAL COM 958102105 3,238,641 83,281 2.64 102,179 -0.51 0.0214
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 3,155,360 -104,087 -3.19 102,706 -29.71 0.0235
2022-08-12 2022-06-30 13F WESTERN DIGITAL COM 958102105 3,259,447 59,142 1.85 146,120 -8.04 0.0313
2022-05-13 2022-03-31 13F WESTERN DIGITAL COM 958102105 3,200,305 -33,844 -1.05 158,895 -24.66 0.0280
2022-02-08 2021-12-31 13F WESTERN DIGITAL COM 958102105 3,234,149 -25,022 -0.77 210,898 14.65 0.0345
2021-11-15 2021-09-30 13F WESTERN DIGITAL COM 958102105 3,259,171 36,920 1.15 183,947 -19.79 0.0326
2021-08-13 2021-06-30 13F WESTERN DIGITAL COM 958102105 3,222,251 -43,919 -1.34 229,327 5.19 0.0404
2021-05-12 2021-03-31 13F WESTERN DIGITAL COM 958102105 3,266,170 -36,064 -1.09 218,017 19.19 0.0406
2021-02-11 2020-12-31 13F WESTERN DIGITAL COM 958102105 3,302,234 -102,023 -3.00 182,911 47.00 0.0356
2020-11-16 2020-09-30 13F WESTERN DIGITAL COM 958102105 3,404,257 -91,693 -2.62 124,426 -19.39 0.0273
2020-08-14 2020-06-30 13F WESTERN DIGITAL COM 958102105 3,495,950 -47,045 -1.33 154,346 4.67 0.0366
2020-05-14 2020-03-31 13F WESTERN DIGITAL COM 958102105 3,542,995 41,210 1.18 147,460 -33.65 0.0423
2020-02-14 2019-12-31 13F WESTERN DIGITAL COM 958102105 3,501,785 -5,083 -0.14 222,258 6.27 0.0497
2019-11-13 2019-09-30 13F WESTERN DIGITAL COM 958102105 3,506,868 -16,047 -0.46 209,150 24.85 0.0501
2019-08-13 2019-06-30 13F WESTERN DIGITAL COM 958102105 3,522,915 224,272 6.80 167,515 5.67 0.0397
2019-05-13 2019-03-31 13F WESTERN DIGITAL COM 958102105 3,298,643 107,847 3.38 158,532 34.39 0.0392
2019-02-12 2018-12-31 13F WESTERN DIGITAL COM 958102105 3,190,796 22,258 0.70 117,964 -36.40 0.0331
2018-11-14 2018-09-30 13F WESTERN DIGITAL COM 958102105 3,168,538 -117,772 -3.58 185,487 -27.09 0.0454
2018-09-18 2018-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,286,310 -80,263 -2.38 254,393 -18.10 0.0646
2018-08-14 2018-06-30 13F WESTERN DIGITAL COM 958102105 3,305,126 -61,447 255,849
2018-05-09 2018-03-31 13F WESTERN DIGITAL COM 958102105 3,366,573 -39,043 -1.15 310,633 14.69 0.0808
2018-02-14 2017-12-31 13F WESTERN DIGITAL COM 958102105 3,405,616 -52,632 -1.52 270,848 -9.35 0.0686
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 3,458,248 266,623 8.35 298,791 5.66 0.0779
2017-08-11 2017-06-30 13F WESTERN DIGITAL COM 958102105 3,191,625 16,436 0.52 282,778 7.91 0.0791
2017-05-12 2017-03-31 13F WESTERN DIGITAL COM 958102105 3,175,189 40,211 1.28 262,049 23.02 0.0756
2017-02-13 2016-12-31 13F WESTERN DIGITAL COM 958102105 3,134,978 -327,653 -9.46 213,021 5.22 0.0653
2016-11-09 2016-09-30 13F WESTERN DIGITAL COM 958102105 3,462,631 -79,155 -2.23 202,460 20.95 0.0631
2016-08-12 2016-06-30 13F WESTERN DIGITAL COM 958102105 3,541,786 447,460 14.46 167,386 2.91 0.0543
2016-08-19 2016-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 3,094,326 65,478 2.16 162,652 -10.57 0.0540
2016-05-13 2016-03-31 13F Western Digital COMM 958102105 3,094,313 146,175
2016-02-12 2015-12-31 13F Western Digital COMM 958102105 3,028,848 -183,044 -5.70 181,882 -28.72 0.0603
2015-11-12 2015-09-30 13F Western Digital COMM 958102105 3,211,892 3,211,892 0.00 255,153 0.0851
2015-08-13 2015-06-30 13F Western Digital COMM 958102105 0 -3,325,425 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Western Digital COMM 958102105 3,325,425 -55,573 -1.64 302,648 -19.14 0.0910
2015-02-12 2014-12-31 13F Western Digital COM 958102105 3,380,998 15,190 0.45 374,276 14.26 0.1130
2014-11-13 2014-09-30 13F Western Digital COMM 958102105 3,365,808 539,165 19.07 327,560 25.55 0.1029
2014-08-14 2014-06-30 13F WESTERN DIGITAL com 958102105 2,826,643 -513,203 -15.37 260,899 -14.92 0.0813
2014-05-14 2014-03-31 13F WESTERN DIGITAL COMM 958102105 3,339,846 413,856 14.14 306,665 24.92 0.0965
2014-02-21 2013-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,925,990 -22,521 -0.76 245,490 31.32 0.0787
2014-02-12 2013-12-31 13F WESTERN DIGITAL COM 958102105 2,925,990 245,490
2013-11-13 2013-09-30 13F WESTERN DIGITAL COM 958102105 2,948,511 -190,766 -6.08 186,936 -4.10 0.0658
2013-08-09 2013-06-30 13F WESTERN DIGITAL COM 958102105 3,139,277 3,139,277 194,918 0.0706
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.