Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionUtah Retirement Systems
Latest Disclosed Ownership55,294 shares
Latest Disclosed Value $ 14,956,475
Utah Retirement Systems reports 2.58% decrease in ownership of WDC / Western Digital Corporation

On May 15, 2026 - Utah Retirement Systems filed a 13F-HR form disclosing ownership of 55,294 shares of Western Digital Corporation (MX:WDC) valued at $14,956,475 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 56,756 shares of Western Digital Corporation. This represents a change in shares of -2.58% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-15 2026-03-31 13F WESTERN DIGITAL COM 958102105 55,294 -1,462 -2.58 14,956 52.97 0.1529
2026-02-17 2025-12-31 13F WESTERN DIGITAL COM 958102105 56,756 -248 -0.44 9,777 42.88 0.0930
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 57,004 0 0.00 6,844 87.63 0.0665
2025-08-14 2025-06-30 13F WESTERN DIGITAL COM 958102105 57,004 -361 -0.63 3,648 57.27 0.0381
2025-05-15 2025-03-31 13F WESTERN DIGITAL COM 958102105 57,365 0 0.00 2,319 -32.19 0.0268
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 57,365 3,500 6.50 3,421 -7.01 0.0377
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 53,865 200 0.37 3,678 -9.54 0.0415
2024-08-14 2024-06-30 13F WESTERN DIGITAL COM 958102105 53,665 -2,600 -4.62 4,066 5.91 0.0483
2024-05-15 2024-03-31 13F WESTERN DIGITAL COM 958102105 56,265 0 0.00 3,840 30.31 0.0449
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 56,265 1,400 2.55 2,947 17.70 0.0375
2023-11-14 2023-09-30 13F WESTERN DIGITAL COM 958102105 54,865 300 0.55 2,503 20.98 0.0358
2023-08-14 2023-06-30 13F WESTERN DIGITAL COM 958102105 54,565 -1,700 -3.02 2,070 -2.36 0.0287
2023-05-16 2023-03-31 13F WESTERN DIGITAL COM 958102105 56,265 0 0.00 2,120 19.38 0.0306
2023-02-15 2022-12-31 13F WESTERN DIGITAL COM 958102105 56,265 500 0.90 1,775 -2.20 0.0282
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 55,765 200 0.36 1,815 -27.14 0.0303
2022-08-16 2022-06-30 13F WESTERN DIGITAL COM 958102105 55,565 0 0.00 2,491 -9.71 0.0399
2022-05-13 2022-03-31 13F WESTERN DIGITAL COM 958102105 55,565 -1,100 -1.94 2,759 -25.33 0.0367
2022-02-14 2021-12-31 13F WESTERN DIGITAL COM 958102105 56,665 1,200 2.16 3,695 18.01 0.0457
2021-11-16 2021-09-30 13F WESTERN DIGITAL COM 958102105 55,465 -3,100 -5.29 3,131 -24.88 0.0423
2021-08-16 2021-06-30 13F WESTERN DIGITAL COM 958102105 58,565 100 0.17 4,168 6.82 0.0537
2021-05-17 2021-03-31 13F WESTERN DIGITAL COM 958102105 58,465 -2,500 -4.10 3,902 15.55 0.0544
2021-02-16 2020-12-31 13F WESTERN DIGITAL COM 958102105 60,965 3,400 5.91 3,377 60.50 0.0479
2020-11-16 2020-09-30 13F WESTERN DIGITAL COM 958102105 57,565 400 0.70 2,104 -16.61 0.0349
2020-08-13 2020-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 57,165 400 0.70 2,523 6.77 0.0463
2020-08-13 2020-06-30 13F WESTERN DIGITAL COM 958102105 57,165 400 2,523 46,307.2577
2020-05-15 2020-03-31 13F WESTERN DIGITAL COM 958102105 56,765 0 0.00 2,363 -34.42 0.0511
2020-02-12 2019-12-31 13F WESTERN DIGITAL COM 958102105 56,765 1,000 1.79 3,603 8.33 0.0633
2019-11-14 2019-09-30 13F WESTERN DIGITAL COM 958102105 55,765 500 0.90 3,326 26.56 0.0633
2019-08-14 2019-06-30 13F WESTERN DIGITAL COM 958102105 55,265 532 0.97 2,628 -0.08 0.0503
2019-05-15 2019-03-31 13F WESTERN DIGITAL COM 958102105 54,733 -693 -1.25 2,630 28.36 0.0521
2019-02-08 2018-12-31 13F WESTERN DIGITAL COM 958102105 55,426 -300 -0.54 2,049 -37.19 0.0463
2018-11-13 2018-09-30 13F WESTERN DIGITAL COM 958102105 55,726 300 0.54 3,262 -23.96 0.0632
2018-08-10 2018-06-30 13F WESTERN DIGITAL COM 958102105 55,426 200 0.36 4,290 -15.80 0.0888
2018-05-15 2018-03-31 13F WESTERN DIGITAL COM 958102105 55,226 100 0.18 5,095 16.22 0.1084
2018-02-14 2017-12-31 13F WESTERN DIGITAL COM 958102105 55,126 1,600 2.99 4,384 -5.19 0.0921
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 53,526 100 0.19 4,624 -2.32 0.1040
2017-08-08 2017-06-30 13F WESTERN DIGITAL COM 958102105 53,426 1,800 3.49 4,734 11.10 0.1103
2017-05-11 2017-03-31 13F WESTERN DIGITAL COM 958102105 51,626 0 0.00 4,261 21.47 0.1019
2017-02-10 2016-12-31 13F WESTERN DIGITAL COM 958102105 51,626 100 0.19 3,508 16.43 0.0882
2016-11-07 2016-09-30 13F WESTERN DIGITAL COM 958102105 51,526 0 0.00 3,013 23.74 0.0780
2016-08-03 2016-06-30 13F WESTERN DIGITAL COM 958102105 51,526 11,226 27.86 2,435 27.89 0.0649
2016-05-10 2016-03-31 13F WESTERN DIGITAL COM 958102105 40,300 0 0.00 1,904 -21.32 0.0516
2016-02-11 2015-12-31 13F WESTERN DIGITAL COM 958102105 40,300 100 0.25 2,420 -24.21 0.0656
2015-11-03 2015-09-30 13F WESTERN DIGITAL COM 958102105 40,200 200 0.50 3,193 1.79 0.0914
2015-08-11 2015-06-30 13F WESTERN DIGITAL COM 958102105 40,000 200 0.50 3,137 -13.41 0.0834
2015-05-14 2015-03-31 13F WESTERN DIGITAL COM 958102105 39,800 1,300 3.38 3,623 -14.99 0.0952
2015-02-11 2014-12-31 13F WESTERN DIGITAL COM 958102105 38,500 0 0.00 4,262 13.74 0.1172
2014-11-06 2014-09-30 13F WESTERN DIGITAL COM 958102105 38,500 2,000 5.48 3,747 11.22 0.1074
2014-08-08 2014-06-30 13F WESTERN DIGITAL COM 958102105 36,500 -1,400 -3.69 3,369 -3.19 0.0965
2014-05-08 2014-03-31 13F WESTERN DIGITAL COM 958102105 37,900 300 0.80 3,480 10.34 0.1004
2014-02-05 2013-12-31 13F WESTERN DIGITAL COM 958102105 37,600 0 0.00 3,154 32.30 0.0933
2013-11-06 2013-09-30 13F WESTERN DIGITAL COM 958102105 37,600 -300 -0.79 2,384 1.32 0.0771
2013-08-02 2013-06-30 13F WESTERN DIGITAL COM 958102105 37,900 37,900 2,353 0.0795
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.