Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionAlerus Financial Na
Latest Disclosed Ownership11,102 shares
Latest Disclosed Value $ 3,002,980
Alerus Financial Na reports 33.39% decrease in ownership of 12355 / Western Digital Corporation

On May 12, 2026 - Alerus Financial Na filed a 13F-HR form disclosing ownership of 11,102 shares of Western Digital Corporation (CH:12355) valued at $3,002,980 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 16,667 shares of Western Digital Corporation. This represents a change in shares of -33.39% 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)
2026-05-12 2026-03-31 13F WESTERN DIGITAL COM 958102105 11,102 -5,565 -33.39 3,003 4.56 0.1484
2026-02-13 2025-12-31 13F WESTERN DIGITAL COM 958102105 16,667 -39,288 -70.21 2,871 -57.26 0.1404
2025-11-10 2025-09-30 13F WESTERN DIGITAL COM 958102105 55,955 -13,485 -19.42 6,718 51.18 0.3418
2025-08-13 2025-06-30 13F WESTERN DIGITAL COM 958102105 69,440 -2,847 -3.94 4,443 52.05 0.3200
2025-05-13 2025-03-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 72,287 -2,295 -3.08 2,923 -34.29 0.2340
2025-02-12 2024-12-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 74,582 -4,493 -5.68 4,447 -17.65 0.3406
2024-11-14 2024-09-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 79,075 -4,595 -5.49 5,400 -14.81 0.3963
2024-08-08 2024-06-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 83,670 -11,185 -11.79 6,340 -2.06 0.4738
2024-05-13 2024-03-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 94,855 -6,436 -6.35 6,473 22.02 0.4888
2024-02-12 2023-12-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 101,291 -3,686 -3.51 5,305 10.73 0.4329
2023-11-14 2023-09-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 104,977 -17,330 -14.17 4,790 3.26 0.4242
2023-08-14 2023-06-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 122,307 -574 -0.47 4,639 0.24 0.3927
2023-05-15 2023-03-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 122,881 1,586 1.31 4,629 20.96 0.4116
2023-02-14 2022-12-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 121,295 27,876 29.84 3,827 25.81 0.3504
2022-11-14 2022-09-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 93,419 9,200 10.92 3,041 -19.47 0.3025
2022-08-12 2022-06-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 84,219 3,632 4.51 3,776 -5.62 0.3491
2022-05-13 2022-03-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 80,587 52,406 185.96 4,001 117.68 0.3412
2022-02-14 2021-12-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 28,181 2,815 11.10 1,838 28.35 0.1498
2021-11-12 2021-09-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 25,366 1,891 8.06 1,432 -14.30 0.1304
2021-08-11 2021-06-30 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 23,475 -287 -1.21 1,671 5.36 0.1685
2021-05-13 2021-03-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 23,762 3,469 17.09 1,586 41.10 0.1672
2021-02-12 2020-12-31 13F WESTERN DIGITAL CORPORATION DEL COM 958102105 20,293 20,293 1,124 0.1142
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.