Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionMercer Global Advisors Inc /adv
Latest Disclosed Ownership141,222 shares
Latest Disclosed Value $ 38,199,119
Mercer Global Advisors Inc /adv reports 1.02% decrease in ownership of 12355 / Western Digital Corporation

On May 15, 2026 - Mercer Global Advisors Inc /adv filed a 13F-HR form disclosing ownership of 141,222 shares of Western Digital Corporation (CH:12355) valued at $38,199,119 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 142,676 shares of Western Digital Corporation. This represents a change in shares of -1.02% 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)
2026-05-15 2026-03-31 13F WESTERN DIGITAL COM 958102105 141,222 -1,454 -1.02 38,199 55.42 0.0565
2026-02-17 2025-12-31 13F WESTERN DIGITAL COM 958102105 142,676 21,540 17.78 24,579 69.00 0.0375
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 121,136 107,135 765.20 14,544 1,524.92 0.0243
2025-08-14 2025-06-30 13F WESTERN DIGITAL COM 958102105 14,001 6,863 96.15 896 210.76 0.0018
2025-05-15 2025-03-31 13F WESTERN DIGITAL COM 958102105 7,138 -23 -0.32 289 -32.55 0.0007
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 7,161 503 7.55 427 -4.04 0.0010
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 6,658 754 12.77 446 -0.45 0.0010
2024-08-12 2024-06-30 13F WESTERN DIGITAL COM 958102105 5,904 -3,709 -38.58 447 0.0012
2024-05-15 2024-03-31 13F WESTERN DIGITAL COM 958102105 9,613 20 0.21 1 0.0019
2024-02-15 2023-12-31 13F WESTERN DIGITAL COM 958102105 9,593 2,232 30.32 1 0.0015
2023-11-15 2023-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 7,361 -1,016 -12.13 0 0.0013
2023-11-14 2023-09-30 13F WESTERN DIGITAL COM 958102105 7,361 -1,016 0 0.0013
2023-08-14 2023-06-30 13F WESTERN DIGITAL COM 958102105 8,377 -6,747 -44.61 0 0.0013
2023-05-16 2023-03-31 13F WESTERN DIGITAL COM 958102105 15,124 1,808 13.58 1 0.0026
2023-02-09 2022-12-31 13F WESTERN DIGITAL COM 958102105 13,316 -2,853 -17.64 0 -100.00 0.0021
2022-11-15 2022-09-30 13F WESTERN DIGITAL COM 958102105 16,169 -3,001 -15.65 526 -38.77 0.0031
2022-08-10 2022-06-30 13F WESTERN DIGITAL COM 958102105 19,170 -10,814 -36.07 859 -42.31 0.0053
2022-05-10 2022-03-31 13F WESTERN DIGITAL COM 958102105 29,984 9,115 43.68 1,489 9.40 0.0088
2022-02-04 2021-12-31 13F WESTERN DIGITAL COM 958102105 20,869 12,862 160.63 1,361 201.11 0.0084
2021-11-10 2021-09-30 13F WESTERN DIGITAL COM 958102105 8,007 3,429 74.90 452 38.65 0.0032
2021-08-10 2021-06-30 13F WESTERN DIGITAL COM 958102105 4,578 -43 -0.93 326 5.84 0.0025
2021-08-10 2021-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 4,621 -461 -9.07 308 9.61 0.0028
2021-05-11 2021-03-31 13F WESTERN DIGITAL COM 958102105 4,621 -461 308 0.0029
2021-02-12 2020-12-31 13F WESTERN DIGITAL COM 958102105 5,082 5,082 281 0.0035
2020-12-10 2020-09-30 13F WESTERN DIGITAL COM 958102105 0 -5,621 -100.00 0 -100.00
2020-08-10 2020-06-30 13F WESTERN DIGITAL COM 958102105 5,621 -13,862 -71.15 248 -69.42 0.0045
2020-05-18 2020-03-31 13F WESTERN DIGITAL COM 958102105 19,483 9,124 88.08 811 23.44 0.0178
2020-02-13 2019-12-31 13F WESTERN DIGITAL CORP COM COM 958102105 10,359 309 3.07 657 9.68 0.0131
2019-11-12 2019-09-30 13F WESTERN DIGITAL CORP COM COM 958102105 10,050 145 1.46 599 27.18 0.0141
2019-08-14 2019-06-30 13F WESTERN DIGITAL CORP COM COM 958102105 9,905 -1,891 -16.03 471 -16.93 0.0125
2019-04-23 2019-03-31 13F/A-1 WESTERN DIGITAL CORP COM COM 958102105 11,796 11,796 567 0.0204
2019-04-12 2019-03-31 13F WESTERN DIGITAL CORP COM COM 958102105 6,861 254 0.0135
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.