Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionEmpirical Finance, LLC
Latest Disclosed Ownership10,915 shares
Latest Disclosed Value $ 2,952,398
Empirical Finance, LLC reports 0.05% decrease in ownership of 12355 / Western Digital Corporation

On May 14, 2026 - Empirical Finance, LLC filed a 13F-HR/A form disclosing ownership of 10,915 shares of Western Digital Corporation (CH:12355) valued at $2,952,398 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 10,921 shares of Western Digital Corporation. This represents a change in shares of -0.05% 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/A-1 WESTERN DIGITAL COM 958102105 10,915 -6 -0.05 2,952 56.94 0.1387
2026-05-14 2026-03-31 13F WESTERN DIGITAL COM 958102105 10,915 -6 2,952 0.1387
2026-02-12 2025-12-31 13F WESTERN DIGITAL COM 958102105 10,921 -441 -3.88 1,881 37.90 0.0897
2025-11-13 2025-09-30 13F WESTERN DIGITAL COM 958102105 11,362 114 1.01 1,364 89.71 0.0649
2025-08-11 2025-06-30 13F WESTERN DIGITAL COM 958102105 11,248 81 0.73 720 59.42 0.0377
2025-05-07 2025-03-31 13F WESTERN DIGITAL COM 958102105 11,167 403 3.74 451 -29.64 0.0273
2025-01-28 2024-12-31 13F WESTERN DIGITAL COM 958102105 10,764 -127 -1.17 642 -13.73 0.0371
2024-11-06 2024-09-30 13F WESTERN DIGITAL COM 958102105 10,891 256 2.41 744 -7.70 0.0434
2024-07-30 2024-06-30 13F WESTERN DIGITAL COM 958102105 10,635 -625 -5.55 806 4.82 0.0503
2024-05-06 2024-03-31 13F WESTERN DIGITAL COM 958102105 11,260 391 3.60 768 34.97 0.0472
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 10,869 -11,431 -51.26 569 -44.05 0.0397
2023-11-02 2023-09-30 13F WESTERN DIGITAL COM 958102105 22,300 1,230 5.84 1,018 27.28 0.0747
2023-07-27 2023-06-30 13F WESTERN DIGITAL COM 958102105 21,070 1,225 6.17 799 6.96 0.0619
2023-04-05 2023-03-31 13F WESTERN DIGITAL COM 958102105 19,845 592 3.07 748 23.06 0.0700
2023-02-21 2022-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 19,253 96 0.50 607 -2.72 0.0629
2023-01-24 2022-12-31 13F WESTERN DIGITAL COM 958102105 19,253 96 1 0.0628
2022-11-04 2022-09-30 13F WESTERN DIGITAL COM 958102105 19,157 12,980 210.13 624 125.27 0.0740
2022-08-01 2022-06-30 13F WESTERN DIGITAL COM 958102105 6,177 368 6.33 277 -3.82 0.0353
2022-04-21 2022-03-31 13F WESTERN DIGITAL COM 958102105 5,809 642 12.43 288 -14.54 0.0323
2022-02-04 2021-12-31 13F WESTERN DIGITAL COM 958102105 5,167 1,374 36.22 337 57.48 0.0398
2021-11-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 3,793 222 6.22 214 -15.75 0.0323
2021-08-10 2021-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,571 3,571 254 0.0414
2019-01-22 2018-12-31 13F WESTERN DIGITAL COM 958102105 0 -17,622 -100.00 0 -100.00
2018-10-18 2018-09-30 13F WESTERN DIGITAL COM 958102105 17,622 -14,373 -44.92 1,032 -58.34 0.2568
2018-07-09 2018-06-30 13F WESTERN DIGITAL COM 958102105 31,995 -8,443 -20.88 2,477 -33.61 0.6276
2018-04-25 2018-03-31 13F WESTERN DIGITAL COM 958102105 40,438 25,997 180.02 3,731 225.00 0.7806
2018-02-01 2017-12-31 13F WESTERN DIGITAL COM 958102105 14,441 14,441 -64.29 1,148 -69.23 0.3787
2017-05-11 2017-03-31 13F WESTERN DIGITAL COM 958102105 0 -127 -100.00 0 -100.00
2017-02-13 2016-12-31 13F WESTERN DIGITAL COM 958102105 127 127 9 0.0061
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.