Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionDaiwa Securities Group Inc.
Latest Disclosed Ownership90,560 shares
Latest Disclosed Value $ 24,495,574
Daiwa Securities Group Inc. reports 4.56% increase in ownership of WDC / Western Digital Corporation

On May 13, 2026 - Daiwa Securities Group Inc. filed a 13F-HR form disclosing ownership of 90,560 shares of Western Digital Corporation (MX:WDC) valued at $24,495,574 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 86,613 shares of Western Digital Corporation. This represents a change in shares of 4.56% 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)
2026-05-13 2026-03-31 13F WESTERN DIGITAL COM 958102105 90,560 3,947 4.56 24,496 174,864.29 0.0704
2026-02-10 2025-12-31 13F WESTERN DIGITAL COM 958102105 86,613 27,156 45.67 15 100.00 0.0477
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 59,457 1,925 3.35 7 133.33 0.0241
2025-08-14 2025-06-30 13F WESTERN DIGITAL COM 958102105 57,532 2,644 4.82 4 50.00 0.0136
2025-05-13 2025-03-31 13F WESTERN DIGITAL COM 958102105 54,888 3,694 7.22 2 -33.33 0.0094
2025-02-07 2024-12-31 13F WESTERN DIGITAL COM 958102105 51,194 6,320 14.08 3 0.00 0.0136
2024-11-12 2024-09-30 13F WESTERN DIGITAL COM 958102105 44,874 -3,701 -7.62 3 0.00 0.0142
2024-08-07 2024-06-30 13F WESTERN DIGITAL COM 958102105 48,575 9,014 22.79 4 50.00 0.0196
2024-05-02 2024-03-31 13F WESTERN DIGITAL COM 958102105 39,561 3,796 10.61 3 100.00 0.0152
2024-01-31 2023-12-31 13F WESTERN DIGITAL COM 958102105 35,765 2,213 6.60 2 0.00 0.0117
2023-11-01 2023-09-30 13F WESTERN DIGITAL COM 958102105 33,552 7,681 29.69 2 0.0109
2023-07-31 2023-06-30 13F WESTERN DIGITAL COM 958102105 25,871 -5,927 -18.64 1 -100.00 0.0065
2023-05-02 2023-03-31 13F WESTERN DIGITAL COM 958102105 31,798 9,731 44.10 1 0.0083
2023-02-06 2022-12-31 13F WESTERN DIGITAL COM 958102105 22,067 -4,901 -18.17 1 -100.00 0.0053
2022-11-02 2022-09-30 13F WESTERN DIGITAL COM 958102105 26,968 341 1.28 878 -26.47 0.0073
2022-08-09 2022-06-30 13F WESTERN DIGITAL COM 958102105 26,627 1,067 4.17 1,194 -5.91 0.0091
2022-04-29 2022-03-31 13F WESTERN DIGITAL COM 958102105 25,560 7,534 41.80 1,269 8.00 0.0059
2022-02-03 2021-12-31 13F WESTERN DIGITAL COM 958102105 18,026 -7,187 -28.51 1,175 -17.37 0.0069
2021-11-05 2021-09-30 13F WESTERN DIGITAL COM 958102105 25,213 2,234 9.72 1,422 -13.03 0.0093
2021-08-06 2021-06-30 13F WESTERN DIGITAL COM 958102105 22,979 1,602 7.49 1,635 14.58 0.0110
2021-05-03 2021-03-31 13F WESTERN DIGITAL COM 958102105 21,377 6,580 44.47 1,427 74.02 0.0106
2021-02-04 2020-12-31 13F WESTERN DIGITAL COM 958102105 14,797 -2,253 -13.21 820 31.62 0.0063
2020-11-02 2020-09-30 13F WESTERN DIGITAL COM 958102105 17,050 3,048 21.77 623 6.86 0.0056
2020-08-11 2020-06-30 13F WESTERN DIGITAL COM 958102105 14,002 0 0.00 583 0.00 0.0123
2020-05-14 2020-03-31 13F WESTERN DIGITAL COM 958102105 14,002 1,218 9.53 583 -28.11 0.0061
2020-01-31 2019-12-31 13F WESTERN DIGITAL COM 958102105 12,784 0 0.00 811 6.43 0.0067
2019-11-04 2019-09-30 13F WESTERN DIGITAL COM 958102105 12,784 1,846 16.88 762 46.54 0.0065
2019-07-24 2019-06-30 13F WESTERN DIGITAL COM 958102105 10,938 0 0.00 520 -1.14 0.0046
2019-04-26 2019-03-31 13F WESTERN DIGITAL COM 958102105 10,938 0 0.00 526 -43.07 0.0046
2019-02-05 2018-12-31 13F WESTERN DIGITAL COM 958102105 10,938 0 0.00 924 44.38 0.0089
2018-11-01 2018-09-30 13F WESTERN DIGITAL COM 958102105 10,938 770 7.57 640 -18.68 0.0054
2018-07-30 2018-06-30 13F WESTERN DIGITAL COM 958102105 10,168 100 0.99 787 -15.29 0.0062
2018-05-02 2018-03-31 13F WESTERN DIGITAL COM 958102105 10,068 -6,892 -40.64 929 -31.13 0.0074
2018-02-06 2017-12-31 13F WESTERN DIGITAL COM 958102105 16,960 -9,246 -35.28 1,349 -40.44 0.0095
2017-11-02 2017-09-30 13F WESTERN DIGITAL COM 958102105 26,206 9,361 55.57 2,265 51.81 0.0155
2017-07-28 2017-06-30 13F WESTERN DIGITAL COM 958102105 16,845 7,300 76.48 1,492 89.58 0.0096
2017-05-02 2017-03-31 13F WESTERN DIGITAL COM 958102105 9,545 -8,720 -47.74 787 -36.58 0.0049
2017-02-01 2016-12-31 13F WESTERN DIGITAL COM 958102105 18,265 7,920 76.56 1,241 105.12 0.0080
2017-01-10 2016-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 10,345 -600 -5.48 605 17.02 0.0036
2016-11-04 2016-09-30 13F WESTERN DIGITAL COM 958102105 10,345 605
2016-07-25 2016-06-30 13F WESTERN DIGITAL COM 958102105 10,945 5,645 106.51 517 106.80 0.0031
2016-05-12 2016-03-31 13F WESTERN DIGITAL COM 958102105 5,300 0 0.00 250 -21.38 0.0016
2016-02-04 2015-12-31 13F WESTERN DIGITAL COM 958102105 5,300 -53,030 -90.91 318 -93.14 0.0021
2015-11-10 2015-09-30 13F WESTERN DIGITAL COM 958102105 58,330 -30,310 -34.19 4,634 -33.33 0.0330
2015-08-05 2015-06-30 13F WESTERN DIGITAL COM 958102105 88,640 29,360 49.53 6,951 28.84 0.0494
2015-05-12 2015-03-31 13F WESTERN DIGITAL COM 958102105 59,280 -139,690 -70.21 5,395 -75.51 0.0361
2015-02-13 2014-12-31 13F WESTERN DIGITAL COM 958102105 198,970 17,320 9.53 22,026 24.60 0.1555
2014-11-12 2014-09-30 13F WESTERN DIGITAL COM 958102105 181,650 93,050 105.02 17,678 116.17 0.1339
2014-08-13 2014-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 88,600 19,900 28.97 8,178 29.64 0.0610
2014-08-13 2014-06-30 13F WESTERN DIGITAL COM 958102105 88,600 8,178
2014-05-14 2014-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 68,700 62,000 6,308 0.0494
2014-05-15 2014-03-31 13F/A-2 WESTERN DIGITAL COM 958102105 68,700 62,000 925.37 6,308 1,022.42 0.0494
2014-05-13 2014-03-31 13F WESTERN DIGITAL COM 958102105 68,700 6,308
2014-02-13 2013-12-31 13F WESTERN DIGITAL COM 958102105 6,700 500 8.06 562 43.00 0.0048
2013-11-14 2013-09-30 13F WESTERN DIGITAL COM 958102105 6,200 -300 -4.62 393 -2.72 0.0031
2013-08-16 2013-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 6,500 6,500 404 0.0031
2013-08-13 2013-06-30 13F WESTERN DIGITAL COM 958102105 6,500 404
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.