Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionKBC Group NV
Latest Disclosed Ownership241,827 shares
Latest Disclosed Value $ 65,412
KBC Group NV reports 59.49% decrease in ownership of WDC / Western Digital Corporation

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 241,827 shares of Western Digital Corporation (MX:WDC) valued at $65,412 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 597,009 shares of Western Digital Corporation. This represents a change in shares of -59.49% 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)
2026-05-07 2026-03-31 13F WESTERN DIGITAL COM 958102105 241,827 -355,182 -59.49 65 -36.27 0.1641
2026-01-26 2025-12-31 13F WESTERN DIGITAL COM 958102105 597,009 373,199 166.75 103 292.31 0.2345
2026-01-20 2025-09-30 13F WESTERN DIGITAL COM 958102105 223,810 10,646 4.99 27 100.00 0.0644
2025-08-08 2025-06-30 13F WESTERN DIGITAL COM 958102105 213,164 -76,529 -26.42 14 18.18 0.0368
2025-04-25 2025-03-31 13F WESTERN DIGITAL COM 958102105 289,693 9,577 3.42 12 -31.25 0.0364
2025-01-22 2024-12-31 13F WESTERN DIGITAL COM 958102105 280,116 3,106 1.12 17 -11.11 0.0460
2024-11-06 2024-09-30 13F WESTERN DIGITAL COM 958102105 277,010 27,849 11.18 19 0.00 0.0572
2024-07-17 2024-06-30 13F WESTERN DIGITAL COM 958102105 249,161 24,909 11.11 19 20.00 0.0570
2024-05-08 2024-03-31 13F WESTERN DIGITAL COM 958102105 224,252 119,151 113.37 15 200.00 0.0486
2024-02-13 2023-12-31 13F WESTERN DIGITAL COM 958102105 105,101 73,212 229.58 6 400.00 0.0195
2024-02-15 2023-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 31,889 -7,075 -18.16 1 0.00 0.0059
2023-11-22 2023-09-30 13F WESTERN DIGITAL COM 958102105 38,635 0 1 0.0061
2024-02-15 2023-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 38,964 -124,862 -76.22 1 -83.33 0.0061
2023-07-28 2023-06-30 13F WESTERN DIGITAL COM 958102105 38,635 -124,862 1 0.0061
2024-02-14 2023-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 163,826 32,796 25.03 6 50.00 0.0262
2023-05-04 2023-03-31 13F WESTERN DIGITAL COM 958102105 163,497 -24,022 6 0.0290
2024-02-14 2022-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 131,030 -56,818 -30.25 4 -33.33 0.0201
2023-02-13 2022-12-31 13F WESTERN DIGITAL COM 958102105 187,519 -329 6 0.0000
2024-02-15 2022-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 187,848 -22,911 -10.87 6 -33.33 0.0318
2022-11-08 2022-09-30 13F WESTERN DIGITAL COM 958102105 187,519 -23,240 6,104 0.0319
2024-02-14 2022-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 210,759 47,990 29.48 9 12.50 0.0471
2022-07-26 2022-06-30 13F WESTERN DIGITAL COM 958102105 203,725 40,956 9,133 0.0460
2024-02-14 2022-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 162,769 -688,411 -80.88 8 -85.45 0.0319
2022-05-06 2022-03-31 13F WESTERN DIGITAL COM 958102105 162,769 -688,411 8,082 0.0298
2024-02-14 2021-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 851,180 802,699 1,655.70 56 -97.99 0.1831
2022-02-03 2021-12-31 13F WESTERN DIGITAL COM 958102105 851,180 802,699 55,505 0.1738
2021-11-10 2021-09-30 13F WESTERN DIGITAL COM 958102105 48,481 0 0.00 2,736 -20.70 0.0100
2022-02-15 2021-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 48,481 6,537 15.59 3,450 23.21 0.0124
2021-08-11 2021-06-30 13F WESTERN DIGITAL COM 958102105 48,481 6,537 3,450 0.0124
2022-02-14 2021-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 41,944 0 0.00 2,800 -87.95 0.0113
2021-04-26 2021-03-31 13F WESTERN DIGITAL COM 958102105 41,944 0 2,800 0.0113
2022-02-14 2020-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 41,944 -317 -0.75 23,233 1,403.75 0.0109
2021-02-10 2020-12-31 13F WESTERN DIGITAL COM 958102105 41,944 -317 2,323 0.0107
2022-02-14 2020-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 42,261 -166,685 -79.77 1,545 -83.25 0.0091
2020-10-28 2020-09-30 13F WESTERN DIGITAL COM 958102105 42,261 -166,685 1,545 0.0091
2022-02-14 2020-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 208,946 7,207 3.57 9,225 9.86 0.0610
2020-08-10 2020-06-30 13F WESTERN DIGITAL COM 958102105 208,946 7,207 9,225 0.0617
2020-05-04 2020-03-31 13F WESTERN DIGITAL COM 958102105 201,739 54,832 37.32 8,397 -9.95 0.0703
2020-02-11 2019-12-31 13F WESTERN DIGITAL COM 958102105 146,907 49,640 51.03 9,325 60.75 0.0590
2019-11-07 2019-09-30 13F WESTERN DIGITAL COM 958102105 97,267 62,889 182.93 5,801 255.02 0.0425
2019-08-08 2019-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 34,378 0 0.00 1,634 -1.09 0.0127
2019-07-30 2019-06-30 13F WESTERN DIGITAL COM 958102105 34,378 -662 1,634
2019-08-07 2019-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 34,378 0 0.00 1,652 30.08 0.0136
2019-05-10 2019-03-31 13F WESTERN DIGITAL COM 958102105 34,378 0 1,652
2019-01-31 2018-12-31 13F WESTERN DIGITAL COM 958102105 34,378 -37,068 -51.88 1,270 -69.63 0.0141
2018-11-14 2018-09-30 13F WESTERN DIGITAL COM 958102105 71,446 28,263 65.45 4,182 25.10 0.0316
2018-08-03 2018-06-30 13F WESTERN DIGITAL COM 958102105 43,183 1,174 2.79 3,343 -13.75 0.0291
2018-08-03 2018-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 42,009 2,857 7.30 3,876 24.47 0.0359
2018-05-09 2018-03-31 13F WESTERN DIGITAL COM 958102105 42,009 2,857 3,876
2018-08-03 2017-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 39,152 4,792 13.95 3,114 4.88 0.0266
2018-02-07 2017-12-31 13F WESTERN DIGITAL COM 958102105 39,152 4,792 3,114
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 34,360 3,645 11.87 2,969 9.11 0.0269
2017-08-04 2017-06-30 13F WESTERN DIGITAL COM 958102105 30,715 3,401 12.45 2,721 20.72 0.0263
2017-05-10 2017-03-31 13F WESTERN DIGITAL COM 958102105 27,314 3,009 12.38 2,254 36.52 0.0203
2017-02-16 2016-12-31 13F WESTERN DIGITAL COM 958102105 24,305 5,150 26.89 1,651 47.41 0.0164
2016-11-03 2016-09-30 13F WESTERN DIGITAL COM 958102105 19,155 -28,413 -59.73 1,120 -50.18 0.0132
2016-08-03 2016-06-30 13F WESTERN DIGITAL COM 958102105 47,568 27,211 133.67 2,248 133.92 0.0322
2016-05-11 2016-03-31 13F WESTERN DIGITAL COM 958102105 20,357 3,854 23.35 961 -3.03 0.0160
2016-02-11 2015-12-31 13F WESTERN DIGITAL COM 958102105 16,503 -497 -2.92 991 -26.65 0.0183
2015-11-12 2015-09-30 13F WESTERN DIGITAL COM 958102105 17,000 -45,478 -72.79 1,351 -72.42 0.0272
2015-12-16 2015-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 62,478 -69,382 -52.62 4,899 -59.18 0.0630
2015-07-31 2015-06-30 13F WESTERN DIGITAL COM 958102105 62,478 4,899
2015-12-16 2015-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 131,860 -38,605 -22.65 12,001 -36.41 0.1524
2015-04-30 2015-03-31 13F WESTERN DIGITAL COM 958102105 131,860 12,001
2015-12-15 2014-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 170,465 156,455 1,116.74 18,871 1,284.52 0.2247
2015-02-12 2014-12-31 13F WESTERN DIGITAL COM 958102105 170,465 18,871
2014-10-16 2014-09-30 13F WESTERN DIGITAL COM 958102105 14,010 -208,226 -93.70 1,363 -93.36 0.0476
2014-08-01 2014-06-30 13F WESTERN DIGITAL COM 958102105 222,236 58,097 35.40 20,512 36.11 0.2343
2014-04-30 2014-03-31 13F WESTERN DIGITAL COM 958102105 164,139 -61,420 -27.23 15,070 -20.37 0.2380
2014-01-21 2013-12-31 13F WESTERN DIGITAL COM 958102105 225,559 -15,467 -6.42 18,924 23.84 0.2863
2013-11-06 2013-09-30 13F WESTERN DIGITAL COM 958102105 241,026 152,055 170.90 15,281 176.63 0.2459
2013-07-29 2013-06-30 13F WESTERN DIGITAL COM 958102105 88,971 88,971 5,524 0.1025
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.