Western Digital Corporation
US ˙ NasdaqGS ˙ US9581021055

SecurityWDC / Western Digital Corporation
InstitutionEntropy Technologies, LP
Latest Disclosed Ownership55,665 shares
Latest Disclosed Value $ 15,056,826
Entropy Technologies, LP reports 1.27% decrease in ownership of WDC / Western Digital Corporation

On May 14, 2026 - Entropy Technologies, LP filed a 13F-HR form disclosing ownership of 55,665 shares of Western Digital Corporation (US:WDC) valued at $15,056,826 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 56,381 shares of Western Digital Corporation. This represents a change in shares of -1.27% during the quarter. The current value of the position is $33,071,133 USD.

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 ORD COM 958102105 55,665 -716 -1.27 15,057 55.02 0.6945
2026-02-13 2025-12-31 13F WESTERN DIGITAL ORD COM 958102105 56,381 5,749 11.35 9,713 59.79 0.5269
2025-11-13 2025-09-30 13F WESTERN DIGITAL ORD COM 958102105 50,632 23 0.05 6,079 87.71 0.4546
2025-08-12 2025-06-30 13F WESTERN DIGITAL COM 958102105 50,609 16,546 48.57 3,238 135.15 0.2572
2025-05-12 2025-03-31 13F WESTERN DIGITAL ORD COM 958102105 34,063 34,063 1,377 0.1341
2024-08-12 2024-06-30 13F WESTERN DIGITAL COM 958102105 0 -65,384 -100.00 0 -100.00
2024-05-08 2024-03-31 13F WESTERN DIGITAL COM 958102105 65,384 56,309 620.48 4,462 839.16 0.4757
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 9,075 9,075 475 0.0881
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.