Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionCIBC Asset Management Inc
Latest Disclosed Ownership141,348 shares
Latest Disclosed Value $ 38,233,221
CIBC Asset Management Inc reports 1.35% decrease in ownership of 12355 / Western Digital Corporation

On May 12, 2026 - CIBC Asset Management Inc filed a 13F-HR form disclosing ownership of 141,348 shares of Western Digital Corporation (CH:12355) valued at $38,233,221 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 143,276 shares of Western Digital Corporation. This represents a change in shares of -1.35% 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 141,348 -1,928 -1.35 38,233 54.90 0.0934
2026-02-10 2025-12-31 13F WESTERN DIGITAL COM 958102105 143,276 95,710 201.22 24,682 332.26 0.0596
2025-10-31 2025-09-30 13F WESTERN DIGITAL COM 958102105 47,566 116 0.24 5,711 88.08 0.0165
2025-08-14 2025-06-30 13F WESTERN DIGITAL COM 958102105 47,450 -4,281 -8.28 3,036 45.19 0.0094
2025-05-13 2025-03-31 13F WESTERN DIGITAL COM 958102105 51,731 -337 -0.65 2,091 -32.64 0.0069
2025-01-31 2024-12-31 13F WESTERN DIGITAL COM 958102105 52,068 4,535 9.54 3,105 -4.37 0.0102
2024-11-06 2024-09-30 13F WESTERN DIGITAL COM 958102105 47,533 3,615 8.23 3,246 -2.43 0.0105
2024-08-01 2024-06-30 13F WESTERN DIGITAL COM 958102105 43,918 -1,608 -3.53 3,328 7.12 0.0118
2024-05-09 2024-03-31 13F WESTERN DIGITAL COM 958102105 45,526 1,427 3.24 3,107 34.52 0.0108
2024-02-13 2023-12-31 13F WESTERN DIGITAL COM 958102105 44,099 -1,588 -3.48 2,309 10.80 0.0086
2023-10-30 2023-09-30 13F WESTERN DIGITAL COM 958102105 45,687 -268 -0.58 2,085 19.56 0.0086
2023-08-14 2023-06-30 13F WESTERN DIGITAL COM 958102105 45,955 -410 -0.88 1,743 -0.17 0.0067
2023-05-12 2023-03-31 13F WESTERN DIGITAL COM 958102105 46,365 1,723 3.86 1,747 24.01 0.0069
2023-02-13 2022-12-31 13F WESTERN DIGITAL COM 958102105 44,642 2,891 6.92 1,408 3.61 0.0059
2022-11-03 2022-09-30 13F WESTERN DIGITAL COM 958102105 41,751 3,716 9.77 1,359 -20.29 0.0060
2022-08-09 2022-06-30 13F WESTERN DIGITAL COM 958102105 38,035 8,235 27.63 1,705 15.20 0.0069
2022-05-06 2022-03-31 13F WESTERN DIGITAL COM 958102105 29,800 328 1.11 1,480 -23.00 0.0052
2022-02-08 2021-12-31 13F WESTERN DIGITAL COM 958102105 29,472 1,644 5.91 1,922 22.34 0.0070
2021-11-09 2021-09-30 13F WESTERN DIGITAL COM 958102105 27,828 983 3.66 1,571 -17.79 0.0063
2021-08-16 2021-06-30 13F WESTERN DIGITAL COM 958102105 26,845 623 2.38 1,911 9.20 0.0077
2021-05-14 2021-03-31 13F WESTERN DIGITAL COM 958102105 26,222 103 0.39 1,750 20.94 0.0074
2021-02-03 2020-12-31 13F WESTERN DIGITAL COM 958102105 26,119 -20,428 -43.89 1,447 -14.93 0.0068
2020-11-05 2020-09-30 13F WESTERN DIGITAL COM 958102105 46,547 2,067 4.65 1,701 -13.39 0.0087
2020-07-28 2020-06-30 13F WESTERN DIGITAL COM 958102105 44,480 1,584 3.69 1,964 10.03 0.0115
2020-04-30 2020-03-31 13F WESTERN DIGITAL COM 958102105 42,896 -2,650 -5.82 1,785 -38.26 0.0126
2020-02-14 2019-12-31 13F WESTERN DIGITAL COM 958102105 45,546 1,983 4.55 2,891 11.28 0.0163
2019-10-30 2019-09-30 13F WESTERN DIGITAL COM 958102105 43,563 -1,108 -2.48 2,598 22.32 0.0153
2019-08-05 2019-06-30 13F WESTERN DIGITAL COM 958102105 44,671 1,246 2.87 2,124 1.77 0.0127
2019-05-06 2019-03-31 13F WESTERN DIGITAL COM 958102105 43,425 1,470 3.50 2,087 34.56 0.0129
2019-02-12 2018-12-31 13F WESTERN DIGITAL COM 958102105 41,955 310 0.74 1,551 -36.38 0.0114
2018-11-02 2018-09-30 13F WESTERN DIGITAL COM 958102105 41,645 593 1.44 2,438 -23.29 0.0151
2018-08-09 2018-06-30 13F WESTERN DIGITAL COM 958102105 41,052 2,271 5.86 3,178 -11.18 0.0198
2018-04-30 2018-03-31 13F WESTERN DIGITAL COM 958102105 38,781 -363 -0.93 3,578 14.94 0.0232
2018-02-02 2017-12-31 13F WESTERN DIGITAL COM 958102105 39,144 2,765 7.60 3,113 -0.95 0.0190
2017-11-06 2017-09-30 13F WESTERN DIGITAL COM 958102105 36,379 814 2.29 3,143 -0.25 0.0197
2017-07-27 2017-06-30 13F WESTERN DIGITAL COM 958102105 35,565 1,300 3.79 3,151 11.42 0.0218
2017-05-12 2017-03-31 13F WESTERN DIGITAL COM 958102105 34,265 878 2.63 2,828 24.64 0.0194
2017-02-08 2016-12-31 13F WESTERN DIGITAL COM 958102105 33,387 234 0.71 2,269 17.08 0.0163
2016-10-19 2016-09-30 13F WESTERN DIGITAL COM 958102105 33,153 -2,365 -6.66 1,938 15.43 0.0143
2016-08-02 2016-06-30 13F WESTERN DIGITAL COM 958102105 35,518 6,246 21.34 1,679 21.40 0.0126
2016-05-09 2016-03-31 13F WESTERN DIGITAL COM 958102105 29,272 622 2.17 1,383 -19.59 0.0104
2016-02-02 2015-12-31 13F WESTERN DIGITAL COM 958102105 28,650 1,488 5.48 1,720 -20.30 0.0142
2015-11-03 2015-09-30 13F WESTERN DIGITAL COM 958102105 27,162 247 0.92 2,158 2.23 0.0172
2015-08-06 2015-06-30 13F WESTERN DIGITAL COM 958102105 26,915 1,086 4.20 2,111 -10.21 0.0147
2015-05-08 2015-03-31 13F WESTERN DIGITAL COM 958102105 25,829 1,330 5.43 2,351 -13.31 0.0167
2015-02-10 2014-12-31 13F WESTERN DIGITAL COM 958102105 24,499 -6,034 -19.76 2,712 -8.72 0.0181
2014-11-05 2014-09-30 13F WESTERN DIGITAL COM 958102105 30,533 -2,065 -6.33 2,971 -1.26 0.0177
2014-08-01 2014-06-30 13F WESTERN DIGITAL COM 958102105 32,598 -532 -1.61 3,009 -1.08 0.0171
2014-05-09 2014-03-31 13F WESTERN DIGITAL COM 958102105 33,130 1,738 5.54 3,042 15.49 0.0179
2014-02-04 2013-12-31 13F WESTERN DIGITAL COM 958102105 31,392 2,042 6.96 2,634 41.54 0.0161
2013-10-29 2013-09-30 13F WESTERN DIGITAL COM 958102105 29,350 162 0.56 1,861 2.70 0.0119
2013-10-02 2013-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 29,188 29,188 1,812 0.0124
2013-08-09 2013-06-30 13F WESTERN DIGITAL COM 958102105 29,188 1,812 0.0124
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.