Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionRockefeller Capital Management L.P.
Latest Disclosed Ownership51,233 shares
Latest Disclosed Value $ 13,858,179
Rockefeller Capital Management L.P. reports 9.15% decrease in ownership of WDC / Western Digital Corporation

On May 14, 2026 - Rockefeller Capital Management L.P. filed a 13F-HR form disclosing ownership of 51,233 shares of Western Digital Corporation (MX:WDC) valued at $13,858,179 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 16, 2026 disclosing 56,391 shares of Western Digital Corporation. This represents a change in shares of -9.15% 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.

Upgrade to unlock premium data and export to Excel .

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 51,233 -5,158 -9.15 13,858 42.66 0.0127
2026-03-16 2025-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 56,391 9,615 20.56 9,715 73.00 0.0175
2026-02-14 2025-12-31 13F WESTERN DIGITAL COM 958102105 56,392 9,616 9,755 0.0089
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 46,776 -4,550 -8.86 5,616 70.98 0.0110
2025-08-14 2025-06-30 13F/A-1 WESTERN DIGITAL COM 958102105 51,326 51,326 3,284 0.0072
2025-08-08 2025-06-30 13F WESTERN DIGITAL COM 958102105 51,326 51,326 3,284 0.0041
2025-05-14 2025-03-31 13F WESTERN DIGITAL COM 958102105 0 -10,371 -100.00 0 -100.00
2025-02-13 2024-12-31 13F WESTERN DIGITAL COM 958102105 10,371 -160 -1.52 619 -14.05 0.0016
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 10,531 -3,616 -25.56 719 -32.87 0.0019
2024-08-12 2024-06-30 13F WESTERN DIGITAL COM 958102105 14,147 2,671 23.27 1,072 36.78 0.0030
2024-05-14 2024-03-31 13F WESTERN DIGITAL COM 958102105 11,476 11,476 783 0.0023
2023-11-14 2023-09-30 13F WESTERN DIGITAL COM 958102105 0 -5,087 -100.00 0 -100.00
2023-08-14 2023-06-30 13F WESTERN DIGITAL COM 958102105 5,087 -851 -14.33 193 0.0007
2023-05-16 2023-03-31 13F WESTERN DIGITAL COM 958102105 5,938 392 7.07 0 -100.00 0.0010
2023-03-06 2022-12-31 13F WESTERN DIGITAL COM 958102105 5,546 -128 -2.26 173 -5.46 0.0009
2022-11-02 2022-09-30 13F WESTERN DIGITAL COM 958102105 5,674 -956 -14.42 183 -38.18 0.0009
2022-08-12 2022-06-30 13F WESTERN DIGITAL COM 958102105 6,630 -95,817 -93.53 296 -94.18 0.0016
2022-05-13 2022-03-31 13F WESTERN DIGITAL COM 958102105 102,447 -18,400 -15.23 5,086 -35.45 0.0245
2022-02-14 2021-12-31 13F WESTERN DIGITAL COM 958102105 120,847 3,069 2.61 7,879 18.55 0.0368
2021-11-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 117,778 9,608 8.88 6,646 -13.67 0.0349
2021-08-10 2021-06-30 13F WESTERN DIGITAL COM 958102105 108,170 104,979 3,289.85 7,698 3,514.08 0.0434
2021-05-11 2021-03-31 13F WESTERN DIGITAL COM 958102105 3,191 814 34.24 213 62.60 0.0014
2021-02-12 2020-12-31 13F WESTERN DIGITAL COM 958102105 2,377 134 5.97 131 59.76 0.0010
2020-11-13 2020-09-30 13F WESTERN DIGITAL COM 958102105 2,243 -4,892 -68.56 82 -73.97 0.0008
2020-08-12 2020-06-30 13F WESTERN DIGITAL COM 958102105 7,135 3,823 115.43 315 128.26 0.0033
2020-05-12 2020-03-31 13F WESTERN DIGITAL COM 958102105 3,312 488 17.28 138 -22.91 0.0018
2020-02-07 2019-12-31 13F WESTERN DIGITAL COM 958102105 2,824 377 15.41 179 22.60 0.0022
2019-11-12 2019-09-30 13F WESTERN DIGITAL COM 958102105 2,447 1,413 136.65 146 197.96 0.0020
2019-08-09 2019-06-30 13F WESTERN DIGITAL COM 958102105 1,034 -5,429 -84.00 49 -84.19 0.0007
2019-05-10 2019-03-31 13F WESTERN DIGITAL COM 958102105 6,463 6,373 7,081.11 310 10,233.33 0.0044
2019-02-12 2018-12-31 13F WESTERN COM 958102105 90 0 0.00 3 -40.00 0.0001
2018-11-02 2018-09-30 13F Western Digital Common 958102105 90 0 0.00 5 -28.57 0.0001
2018-07-31 2018-06-30 13F Western Digital Common 958102105 90 90 7 0.0001
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.