Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionM&t Bank Corp
Latest Disclosed Ownership18,068 shares
Latest Disclosed Value $ 4,887,213
M&t Bank Corp reports 0.07% decrease in ownership of WDC / Western Digital Corporation

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 18,068 shares of Western Digital Corporation (MX:WDC) valued at $4,887,213 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 18,080 shares of Western Digital Corporation. This represents a change in shares of -0.07% 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 18,068 -12 -0.07 4,887 56.94 0.0040
2026-01-30 2025-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 18,080 3,989 28.31 3,115 84.15 0.0100
2026-01-28 2025-12-31 13F WESTERN DIGITAL COM 958102105 222,894 208,803 29,250 0.0174
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 14,091 -2,860 -16.87 1,692 56.00 0.0057
2025-08-13 2025-06-30 13F WESTERN DIGITAL COM 958102105 16,951 3,615 27.11 1,085 101.11 0.0037
2025-04-30 2025-03-31 13F WESTERN DIGITAL COM 958102105 13,336 -2,143 -13.84 540 -41.60 0.0020
2025-02-06 2024-12-31 13F WESTERN DIGITAL COM 958102105 15,479 472 3.15 923 -9.86 0.0031
2024-11-19 2024-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 15,007 -68 -0.45 1,025 -10.33 0.0034
2024-11-15 2024-09-30 13F WESTERN DIGITAL COM 958102105 15,007 -68 1,025 0.0006
2024-07-31 2024-06-30 13F WESTERN DIGITAL COM 958102105 15,075 1,027 7.31 1,143 19.21 0.0039
2024-05-07 2024-03-31 13F WESTERN DIGITAL COM 958102105 14,048 276 2.00 959 32.87 0.0033
2024-02-06 2023-12-31 13F WESTERN DIGITAL COM 958102105 13,772 -3,250 -19.09 722 -7.21 0.0027
2023-11-02 2023-09-30 13F WESTERN DIGITAL COM 958102105 17,022 532 3.23 777 24.32 0.0031
2023-08-09 2023-06-30 13F WESTERN DIGITAL COM 958102105 16,490 -1,276 -7.18 626 -6.44 0.0023
2023-05-11 2023-03-31 13F WESTERN DIGITAL COM 958102105 17,766 -17 -0.10 669 19.29 0.0026
2023-02-13 2022-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 17,783 -266 -1.47 561 -4.60 0.0023
2023-02-13 2022-12-31 13F WESTERN ASSET MANAGED MUNS F COM 958102105 16,666 -1,383 478 0.0019
2022-11-17 2022-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 18,049 2,483 15.95 587 -15.30 0.0026
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 18,049 2,483 587 0.0005
2022-08-05 2022-06-30 13F WESTERN DIGITAL COM 958102105 15,566 2,997 23.84 693 10.88 0.0033
2022-05-09 2022-03-31 13F WESTERN DIGITAL COM 958102105 12,569 -24 -0.19 625 -23.97 0.0028
2022-02-07 2021-12-31 13F WESTERN DIGITAL COM 958102105 12,593 188 1.52 822 17.43 0.0035
2021-10-28 2021-09-30 13F WESTERN DIGITAL COM 958102105 12,405 -895 -6.73 700 -25.93 0.0032
2021-08-13 2021-06-30 13F WESTERN DIGITAL COM 958102105 13,300 929 7.51 945 14.27 0.0041
2021-05-06 2021-03-31 13F WESTERN DIGITAL COM 958102105 12,371 -10,327 -45.50 827 -34.21 0.0036
2021-02-12 2020-12-31 13F WESTERN DIGITAL COM 958102105 22,698 643 2.92 1,257 56.15 0.0055
2020-11-06 2020-09-30 13F WESTERN DIGITAL COM 958102105 22,055 -13 -0.06 805 -17.35 0.0040
2020-07-29 2020-06-30 13F WESTERN DIGITAL COM 958102105 22,068 -75 -0.34 974 5.87 0.0052
2020-05-14 2020-03-31 13F WESTERN DIGITAL COM 958102105 22,143 22,143 920 0.0054
2020-02-07 2019-12-31 13F WESTERN DIGITAL COM 958102105 0 -27,124 -100.00 0 -100.00
2019-11-12 2019-09-30 13F WESTERN DIGITAL COM 958102105 27,124 -7,196 -20.97 1,617 -0.92 0.0081
2019-08-12 2019-06-30 13F WESTERN DIGITAL COM 958102105 34,320 -7,864 -18.64 1,632 -19.53 0.0085
2019-05-15 2019-03-31 13F WESTERN DIGITAL COM 958102105 42,184 7,586 21.93 2,028 58.56 0.0106
2019-02-01 2018-12-31 13F WESTERN DIGITAL COM 958102105 34,598 1,831 5.59 1,279 -33.32 0.0073
2018-11-09 2018-09-30 13F WESTERN DIGITAL COM 958102105 32,767 -1,708 -4.95 1,918 -28.14 0.0096
2018-08-10 2018-06-30 13F WESTERN DIGITAL COM 958102105 34,475 4,516 15.07 2,669 -3.44 0.0144
2018-05-04 2018-03-31 13F WESTERN DIGITAL COM 958102105 29,959 2,465 8.97 2,764 26.38 0.0148
2018-02-06 2017-12-31 13F WESTERN DIGITAL COM 958102105 27,494 -2,136 -7.21 2,187 -14.50 0.0115
2017-11-13 2017-09-30 13F WESTERN DIGITAL COM 958102105 29,630 -6,986 -19.08 2,558 -21.15 0.0139
2017-08-11 2017-06-30 13F WESTERN DIGITAL COM 958102105 36,616 -1,134 -3.00 3,244 4.14 0.0192
2017-05-10 2017-03-31 13F WESTERN DIGITAL COM 958102105 37,750 -8,186 -17.82 3,115 -0.19 0.0188
2017-02-14 2016-12-31 13F WESTERN DIGITAL COM 958102105 45,936 19,981 76.98 3,121 105.60 0.0194
2016-11-04 2016-09-30 13F WESTERN DIGITAL COM 958102105 25,955 -3,206 -10.99 1,518 10.16 0.0097
2016-08-04 2016-06-30 13F WESTERN DIGITAL COM 958102105 29,161 9,464 48.05 1,378 48.01 0.0093
2016-05-11 2016-03-31 13F WESTERN DIGITAL COM 958102105 19,697 -2,801 -12.45 931 -31.09 0.0063
2016-02-12 2015-12-31 13F WESTERN DIGITAL COM 958102105 22,498 2,265 11.19 1,351 -15.98 0.0090
2015-11-13 2015-09-30 13F WESTERN DIGITAL COM 958102105 20,233 9,417 87.07 1,608 89.62 0.0110
2015-08-14 2015-06-30 13F WESTERN DIGITAL COM 958102105 10,816 38 0.35 848 -13.65 0.0051
2015-05-14 2015-03-31 13F WESTERN DIGITAL COM 958102105 10,778 -198 -1.80 982 -19.18 0.0061
2015-02-12 2014-12-31 13F WESTERN DIGITAL COM 958102105 10,976 2,632 31.54 1,215 49.63 0.0076
2014-11-14 2014-09-30 13F WESTERN DIGITAL COM 958102105 8,344 8,344 812 0.0057
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.