Western Digital Corporation
US ˙ NasdaqGS ˙ US9581021055

SecurityWDC / Western Digital Corporation
InstitutionD.a. Davidson & Co.
Latest Disclosed Ownership4,305 shares
Latest Disclosed Value $ 1,164,479
D.a. Davidson & Co. reports 12.68% decrease in ownership of WDC / Western Digital Corporation

On May 5, 2026 - D.a. Davidson & Co. filed a 13F-HR form disclosing ownership of 4,305 shares of Western Digital Corporation (US:WDC) valued at $1,164,459 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 4,930 shares of Western Digital Corporation. This represents a change in shares of -12.68% during the quarter. The current value of the position is $2,477,528 USD.

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)
2026-05-05 2026-03-31 13F WESTERN DIGITAL COM 958102105 4,305 -625 -12.68 1,164 37.10 0.0071
2026-01-29 2025-12-31 13F WESTERN DIGITAL COM 958102105 4,930 -142 -2.80 849 39.64 0.0052
2025-10-22 2025-09-30 13F WESTERN DIGITAL COM 958102105 5,072 -18,775 -78.73 609 -60.13 0.0039
2025-07-30 2025-06-30 13F WESTERN DIGITAL COM 958102105 23,847 18,154 318.88 1,526 563.04 0.0107
2025-04-28 2025-03-31 13F WESTERN DIGITAL COM 958102105 5,693 -392 -6.44 230 -36.46 0.0018
2025-01-31 2024-12-31 13F WESTERN DIGITAL COM 958102105 6,085 -150 -2.41 363 -14.82 0.0030
2024-11-13 2024-09-30 13F WESTERN DIGITAL COM 958102105 6,235 1,000 19.10 426 7.32 0.0035
2024-08-01 2024-06-30 13F WESTERN DIGITAL COM 958102105 5,235 -16,900 -76.35 397 -73.77 0.0035
2024-05-13 2024-03-31 13F WESTERN DIGITAL COM 958102105 22,135 4,343 24.41 1,510 62.19 0.0136
2024-02-09 2023-12-31 13F WESTERN DIGITAL COM 958102105 17,792 -396 -2.18 932 12.30 0.0091
2023-11-08 2023-09-30 13F WESTERN DIGITAL COM 958102105 18,188 129 0.71 830 21.20 0.0090
2023-08-11 2023-06-30 13F WESTERN DIGITAL COM 958102105 18,059 4,600 34.18 685 34.91 0.0072
2023-04-25 2023-03-31 13F WESTERN DIGITAL COM 958102105 13,459 -1,459 -9.78 507 7.87 0.0057
2023-02-03 2022-12-31 13F WESTERN DIGITAL COM 958102105 14,918 -14,331 -49.00 471 -50.63 0.0056
2022-11-07 2022-09-30 13F WESTERN DIGITAL COM 958102105 29,249 3,856 15.19 952 -16.34 0.0125
2022-07-28 2022-06-30 13F WESTERN DIGITAL COM 958102105 25,393 348 1.39 1,138 -8.52 0.0143
2022-05-12 2022-03-31 13F WESTERN DIGITAL COM 958102105 25,045 19,700 368.57 1,244 256.45 0.0136
2022-01-31 2021-12-31 13F WESTERN DIGITAL COM 958102105 5,345 1,005 23.16 349 42.45 0.0037
2021-11-15 2021-09-30 13F WESTERN DIGITAL COM 958102105 4,340 -780 -15.23 245 -32.69 0.0028
2021-08-10 2021-06-30 13F WESTERN DIGITAL COM 958102105 5,120 300 6.22 364 13.04 0.0043
2021-05-07 2021-03-31 13F WESTERN DIGITAL COM 958102105 4,820 -10 -0.21 322 21.51 0.0041
2021-02-10 2020-12-31 13F WESTERN DIGITAL COM 958102105 4,830 -16,500 -77.36 265 -66.03 0.0041
2020-11-02 2020-09-30 13F WESTERN DIGITAL COM 958102105 21,330 -10,094 -32.12 780 -43.76 0.0136
2020-08-10 2020-06-30 13F WESTERN DIGITAL COM 958102105 31,424 19,321 159.64 1,387 174.65 0.0259
2020-05-05 2020-03-31 13F WESTERN DIGITAL COM 958102105 12,103 3,842 46.51 505 -3.63 0.0099
2020-02-14 2019-12-31 13F WESTERN DIGITAL COM 958102105 8,261 -573 -6.49 524 -0.57 0.0085
2019-11-05 2019-09-30 13F WESTERN DIGITAL COM 958102105 8,834 -15,454 -63.63 527 -54.37 0.0094
2019-08-13 2019-06-30 13F WESTERN DIGITAL COM 958102105 24,288 -23,914 -49.61 1,155 -50.15 0.0215
2019-05-13 2019-03-31 13F WESTERN DIGITAL COM 958102105 48,202 2,811 6.19 2,317 38.08 0.0398
2019-01-29 2018-12-31 13F WESTERN DIGITAL COM 958102105 45,391 -4,477 -8.98 1,678 -42.51 0.0327
2018-11-13 2018-09-30 13F WESTERN DIGITAL COM 958102105 49,868 12,349 32.91 2,919 0.52 0.0519
2018-08-02 2018-06-30 13F WESTERN DIGITAL COM 958102105 37,519 474 1.28 2,904 -15.04 0.0569
2018-05-04 2018-03-31 13F WESTERN DIGITAL COM 958102105 37,045 -3,778 -9.25 3,418 5.27 0.0706
2018-02-08 2017-12-31 13F WESTERN DIGITAL COM 958102105 40,823 1,260 3.18 3,247 -5.00 0.0681
2017-11-08 2017-09-30 13F WESTERN DIGITAL COM 958102105 39,563 -174 -0.44 3,418 -2.90 0.0671
2017-08-11 2017-06-30 13F WESTERN DIGITAL COM 958102105 39,737 779 2.00 3,520 9.49 0.0795
2017-05-12 2017-03-31 13F WESTERN DIGITAL COM 958102105 38,958 -2,095 -5.10 3,215 15.36 0.0780
2017-02-15 2016-12-31 13F WESTERN DIGITAL COM 958102105 41,053 -8,518 -17.18 2,787 -3.76 0.0632
2016-11-18 2016-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 49,571 -2,224 -4.29 2,896 18.45 0.0721
2016-11-14 2016-09-30 13F WESTERN DIGITAL COM 958102105 49,571 2,896
2016-08-13 2016-06-30 13F WESTERN DIGITAL COM 958102105 51,795 23,351 82.09 2,445 82.33 0.0719
2016-05-13 2016-03-31 13F WESTERN DIGITAL COM 958102105 28,444 2,257 8.62 1,341 -14.59 0.0418
2016-02-12 2015-12-31 13F WESTERN DIGITAL COM 958102105 26,187 25,587 4,264.50 1,570 3,240.43 0.0511
2015-11-13 2015-09-30 13F WESTERN DIGITAL COM 958102105 600 600 0.00 47 0.0016
2014-11-12 2014-09-30 13F WESTERN DIGITAL COM 958102105 0 -140 -100.00 0 -100.00
2014-07-29 2014-06-30 13F WESTERN DIGITAL COM 958102105 140 -10 -6.67 12 -7.69 0.0004
2014-05-05 2014-03-31 13F WESTERN DIGITAL COM 958102105 150 -20 -11.76 13 -7.14 0.0005
2014-02-13 2013-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 170 170 14 0.0005
2014-02-12 2013-12-31 13F WESTERN DIGITAL COM 958102105 170 14 0.0005
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.