Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionCIBC World Markets Inc.
Latest Disclosed Ownership19,939 shares
Latest Disclosed Value $ 5,393,300
CIBC World Markets Inc. reports 61.57% decrease in ownership of 12355 / Western Digital Corporation

On May 14, 2026 - CIBC World Markets Inc. filed a 13F-HR form disclosing ownership of 19,939 shares of Western Digital Corporation (CH:12355) valued at $5,393,300 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 51,887 shares of Western Digital Corporation. This represents a change in shares of -61.57% 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 19,939 -31,948 -61.57 5,393 -39.66 0.0088
2026-02-10 2025-12-31 13F WESTERN DIGITAL COM 958102105 51,887 5,153 11.03 8,939 59.32 0.0144
2025-11-06 2025-09-30 13F WESTERN DIGITAL COM 958102105 46,734 2,746 6.24 5,611 99.36 0.0101
2025-08-14 2025-06-30 13F WESTERN DIGITAL COM 958102105 43,988 -52,922 -54.61 2,815 -28.18 0.0056
2025-05-14 2025-03-31 13F WESTERN DIGITAL COM 958102105 96,910 58,800 154.29 3,918 195,800.00 0.0084
2025-01-23 2024-12-31 13F WESTERN DIGITAL COM 958102105 38,110 22,710 147.47 2 100.00 0.0048
2024-11-12 2024-09-30 13F WESTERN DIGITAL COM 958102105 15,400 -123,998 -88.95 1 -90.00 0.0022
2024-08-07 2024-06-30 13F WESTERN DIGITAL COM 958102105 139,398 121,622 684.19 11 900.00 0.0243
2024-05-13 2024-03-31 13F WESTERN DIGITAL COM 958102105 17,776 -199 -1.11 1 0.0029
2024-02-13 2023-12-31 13F WESTERN DIGITAL COM 958102105 17,975 -1,200 -6.26 1 0.0024
2023-11-13 2023-09-30 13F WESTERN DIGITAL COM 958102105 19,175 -1,462 -7.08 1 0.0029
2023-08-11 2023-06-30 13F WESTERN DIGITAL COM 958102105 20,637 680 3.41 1 0.0025
2023-05-12 2023-03-31 13F WESTERN DIGITAL COM 958102105 19,957 -161 -0.80 1 0.0025
2023-02-13 2022-12-31 13F WESTERN DIGITAL COM 958102105 20,118 -5,054 -20.08 1 -100.00 0.0022
2022-11-10 2022-09-30 13F WESTERN DIGITAL COM 958102105 25,172 -384 -1.50 819 -28.53 0.0031
2022-08-10 2022-06-30 13F WESTERN DIGITAL COM 958102105 25,556 309 1.22 1,146 -8.61 0.0040
2022-05-12 2022-03-31 13F WESTERN DIGITAL COM 958102105 25,247 1,658 7.03 1,254 -18.47 0.0040
2022-02-14 2021-12-31 13F WESTERN DIGITAL COM 958102105 23,589 1,462 6.61 1,538 23.14 0.0044
2021-11-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 22,127 -150 -0.67 1,249 -21.20 0.0041
2021-08-12 2021-06-30 13F WESTERN DIGITAL COM 958102105 22,277 -613 -2.68 1,585 3.73 0.0044
2021-05-11 2021-03-31 13F WESTERN DIGITAL COM 958102105 22,890 -2,012 -8.08 1,528 10.80 0.0044
2021-02-08 2020-12-31 13F WESTERN DIGITAL COM 958102105 24,902 100 0.40 1,379 52.04 0.0044
2020-11-12 2020-09-30 13F WESTERN DIGITAL COM 958102105 24,802 -2,582 -9.43 907 -24.98 0.0039
2020-08-13 2020-06-30 13F WESTERN DIGITAL COM 958102105 27,384 -2,071 -7.03 1,209 -1.39 0.0055
2020-05-15 2020-03-31 13F WESTERN DIGITAL COM 958102105 29,455 1,001 3.52 1,226 -32.12 0.0063
2020-02-13 2019-12-31 13F WESTERN DIGITAL COM 958102105 28,454 -64,562 -69.41 1,806 -67.44 0.0074
2019-11-13 2019-09-30 13F WESTERN DIGITAL COM 958102105 93,016 48,877 110.73 5,547 164.27 0.0249
2019-08-08 2019-06-30 13F WESTERN DIGITAL COM 958102105 44,139 -35,957 -44.89 2,099 -45.47 0.0093
2019-05-09 2019-03-31 13F WESTERN DIGITAL COM 958102105 80,096 11,666 17.05 3,849 52.13 0.0177
2019-02-13 2018-12-31 13F WESTERN DIGITAL COM 958102105 68,430 1,329 1.98 2,530 -35.59 0.0129
2018-11-09 2018-09-30 13F WESTERN DIGITAL COM 958102105 67,101 -15,956 -19.21 3,928 -38.90 0.0168
2018-08-08 2018-06-30 13F WESTERN DIGITAL COM 958102105 83,057 5,252 6.75 6,429 -10.45 0.0281
2018-05-18 2018-03-31 13F WESTERN DIGITAL COM 958102105 77,805 70,060 904.58 7,179 1,065.42 0.0296
2018-02-01 2017-12-31 13F WESTERN DIGITAL COM 958102105 7,745 3,597 86.72 616 72.07 0.0028
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 4,148 -134,920 -97.02 358 -97.09 0.0017
2017-08-10 2017-06-30 13F WESTERN DIGITAL COM 958102105 139,068 139,068 12,321 0.0524
2017-05-08 2017-03-31 13F WESTERN DIGITAL COM 958102105 0 -83,041 -100.00 0 -100.00
2017-05-08 2016-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 83,041 13,304 19.08 5,643 38.38 0.0210
2017-01-09 2016-12-31 13F WESTERN DIGITAL COM 958102105 65,398 -4,339 4,444 0.0183
2017-05-08 2016-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 69,737 36,897 112.35 4,078 162.76 0.0166
2016-11-03 2016-09-30 13F WESTERN DIGITAL COM 958102105 50,915 18,075 2,977 0.0128
2016-07-21 2016-06-30 13F WESTERN DIGITAL COM 958102105 32,840 948 2.97 1,552 2.99 0.0068
2016-05-04 2016-03-31 13F WESTERN DIGITAL COM 958102105 31,892 2,159 7.26 1,507 -15.57 0.0070
2016-01-14 2015-12-31 13F WESTERN DIGITAL COM 958102105 29,733 5,985 25.20 1,785 -5.41 0.0090
2015-10-26 2015-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 23,748 -356 -1.48 1,887 -0.16 0.0094
2015-10-22 2015-09-30 13F WESTERN DIGITAL COM 958102105 23,748 -356 1,887 0.0095
2015-07-22 2015-06-30 13F WESTERN DIGITAL COM 958102105 24,104 -63,041 -72.34 1,890 -76.17 0.0082
2015-04-23 2015-03-31 13F WESTERN DIGITAL COM 958102105 87,145 87,145 0.00 7,931 0.0324
2015-02-04 2014-12-31 13F WESTERN DIGITAL COM 958102105 0 -95,039 -100.00 0 -100.00
2014-10-22 2014-09-30 13F WESTERN DIGITAL COM 958102105 95,039 32,850 52.82 9,249 61.13 0.0332
2014-08-08 2014-06-30 13F WESTERN DIGITAL COM 958102105 62,189 5,703 10.10 5,740 10.66 0.0200
2014-05-13 2014-03-31 13F WESTERN DIGITAL COM 958102105 56,486 6,706 13.47 5,187 24.18 0.0198
2014-02-07 2013-12-31 13F WESTERN DIGITAL COM 958102105 49,780 9,130 22.46 4,177 62.09 0.0173
2013-11-05 2013-09-30 13F WESTERN DIGITAL COM 958102105 40,650 9,677 31.24 2,577 34.01 0.0107
2013-08-07 2013-06-30 13F WESTERN DIGITAL COM 958102105 30,973 30,973 1,923 0.0086
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.