Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionLevel Four Advisory Services, Llc
Latest Disclosed Ownership11,474 shares
Latest Disclosed Value $ 3,103,602
Level Four Advisory Services, Llc reports 17.84% decrease in ownership of WDC / Western Digital Corporation

On May 14, 2026 - Level Four Advisory Services, Llc filed a 13F-HR form disclosing ownership of 11,474 shares of Western Digital Corporation (MX:WDC) valued at $3,103,602 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 13,966 shares of Western Digital Corporation. This represents a change in shares of -17.84% 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 11,474 -2,492 -17.84 3,104 29.02 0.1019
2026-02-13 2025-12-31 13F WESTERN DIGITAL COM 958102105 13,966 4,104 41.61 2,406 103.13 0.0787
2025-11-12 2025-09-30 13F WESTERN DIGITAL COM 958102105 9,862 9,862 1,184 0.0405
2024-08-09 2024-06-30 13F WESTERN DIGITAL COM 958102105 0 -68,671 -100.00 0 -100.00
2024-05-13 2024-03-31 13F WESTERN DIGITAL COM 958102105 68,671 644 0.95 3,596 0.95 0.1976
2024-02-08 2023-12-31 13F WESTERN DIGITAL COM 958102105 68,027 170 0.25 3,563 15.05 0.1999
2023-11-13 2023-09-30 13F WESTERN DIGITAL COM 958102105 67,857 22,138 48.42 3,096 78.55 0.1996
2023-07-10 2023-06-30 13F WESTERN DIGITAL COM 958102105 45,719 17,884 64.25 1,734 65.46 0.1042
2023-06-05 2023-03-31 13F WESTERN DIGITAL COM 958102105 27,835 7,220 35.02 1,049 61.23 0.0688
2023-02-13 2022-12-31 13F WESTERN DIGITAL COM 958102105 20,615 -2,419 -10.50 650 -13.33 0.0483
2022-11-07 2022-09-30 13F WESTERN DIGITAL COM 958102105 23,034 4,024 21.17 750 -11.97 0.0729
2022-08-08 2022-06-30 13F WESTERN DIGITAL COM 958102105 19,010 5,558 41.32 852 27.54 0.0804
2022-05-10 2022-03-31 13F WESTERN DIGITAL COM 958102105 13,452 165 1.24 668 -22.86 0.0523
2022-02-11 2021-12-31 13F WESTERN DIGITAL COM 958102105 13,287 949 7.69 866 24.43 0.0660
2021-10-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 12,338 -859 -6.51 696 -25.88 0.0724
2021-08-09 2021-06-30 13F WESTERN DIGITAL COM 958102105 13,197 -707 -5.08 939 1.19 0.0649
2021-05-10 2021-03-31 13F WESTERN DIGITAL COM 958102105 13,904 1,299 10.31 928 32.95 0.0721
2021-02-10 2020-12-31 13F WESTERN DIGITAL COM 958102105 12,605 360 2.94 698 55.80 0.0560
2020-11-02 2020-09-30 13F WESTERN DIGITAL COM 958102105 12,245 -169 -1.36 448 -19.28 0.0345
2020-08-17 2020-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 12,414 83 0.67 555 8.19 0.0429
2020-05-13 2020-03-31 13F WESTERN DIGITAL COM 958102105 12,331 779 6.74 513 -30.20 0.0615
2020-02-13 2019-12-31 13F WESTERN DIGITAL COM 958102105 11,552 379 3.39 735 10.19 0.0291
2019-11-12 2019-09-30 13F WESTERN DIGITAL COM 958102105 11,173 -177 -1.56 667 23.52 0.0690
2019-08-14 2019-06-30 13F WESTERN DIGITAL COM 958102105 11,350 1,378 13.82 540 12.50 0.0545
2019-05-15 2019-03-31 13F WESTERN DIGITAL COM 958102105 9,972 9,972 480 0.0529
2019-02-07 2018-12-31 13F WESTERN DIGITAL COM 958102105 0 -3,576 -100.00 0 -100.00
2018-11-14 2018-09-30 13F WESTERN DIGITAL COM 958102105 3,576 -129 -3.48 209 -27.18 0.0226
2018-08-14 2018-06-30 13F WESTERN DIGITAL COM 958102105 3,705 -5,240 -58.58 287 -65.21 0.0209
2018-05-14 2018-03-31 13F WESTERN DIGITAL COM 958102105 8,945 6,060 210.05 825 260.26 0.0640
2018-02-13 2017-12-31 13F WESTERN DIGITAL COM 958102105 2,885 -435 -13.10 229 -20.21 0.0178
2018-04-03 2017-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 3,320 -972 -22.65 287 -19.15 0.0254
2017-11-15 2017-09-30 13F WESTERN DIGITAL COM 958102105 3,110 -1,182 262
2017-09-20 2017-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 4,292 -110 -2.50 355 -2.47 0.0547
2017-07-12 2017-06-30 13F WESTERN DIGITAL COM 958102105 4,292 -110 355
2017-09-20 2017-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 4,402 4,402 364 0.0371
2017-05-15 2017-03-31 13F WESTERN DIGITAL COM 958102105 4,402 364
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.