Western Digital Corporation
US ˙ NasdaqGS ˙ US9581021055

SecurityWDC / Western Digital Corporation
InstitutionAustralianSuper Pty Ltd
Latest Disclosed Ownership224,701 shares
Latest Disclosed Value $ 60,779,373
AustralianSuper Pty Ltd reports 36.10% decrease in ownership of WDC / Western Digital Corporation

On May 7, 2026 - AustralianSuper Pty Ltd filed a 13F-HR form disclosing ownership of 224,701 shares of Western Digital Corporation (US:WDC) valued at $60,779,373 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 351,672 shares of Western Digital Corporation. This represents a change in shares of -36.10% during the quarter. The current value of the position is $114,983,996 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)
2026-05-07 2026-03-31 13F WESTERN DIGITAL COM 958102105 224,701 -126,971 -36.10 60,779 0.33 0.3168
2026-02-05 2025-12-31 13F WESTERN DIGITAL COM 958102105 351,672 66,450 23.30 60,583 76.92 0.2816
2025-11-12 2025-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 285,222 285,222 34,244 0.1618
2025-11-03 2025-09-30 13F WESTERN DIGITAL COM 958102105 285,222 285,222 34,244 0.1571
2023-07-28 2023-06-30 13F WESTERN DIGITAL COM 958102105 0 -799,845 -100.00 0 -100.00
2023-04-21 2023-03-31 13F WESTERN DIGITAL COM 958102105 799,845 -44,989 -5.33 30,130 13.54 0.1834
2023-02-01 2022-12-31 13F WESTERN DIGITAL COM 958102105 844,834 -32,789 -3.74 26,536 -7.11 0.1765
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 877,623 -212,661 -19.51 28,567 -41.55 0.2033
2022-07-13 2022-06-30 13F WESTERN DIGITAL COM 958102105 1,090,284 316,193 40.85 48,877 27.17 0.3014
2022-04-29 2022-03-31 13F WESTERN DIGITAL COM 958102105 774,091 124,032 19.08 38,434 -12.56 0.2088
2022-01-24 2021-12-31 13F WESTERN DIGITAL COM 958102105 650,059 254,286 64.25 43,957 96.79 0.2282
2021-11-12 2021-09-30 13F WESTERN DIGITAL COM 958102105 395,773 72,235 22.33 22,337 -2.99 0.1433
2021-08-12 2021-06-30 13F WESTERN DIGITAL COM 958102105 323,538 141,616 77.84 23,026 89.62 0.1607
2021-05-14 2021-03-31 13F WESTERN DIGITAL COM 958102105 181,922 114,438 169.58 12,143 224.85 0.0950
2021-02-11 2020-12-31 13F WESTERN DIGITAL COM 958102105 67,484 67,484 3,738 0.0280
2020-05-13 2020-03-31 13F WESTERN DIGITAL COM 958102105 0 -82,481 -100.00 0 -100.00
2020-02-10 2019-12-31 13F WESTERN DIGITAL COM 958102105 82,481 -145,328 -63.79 5,235 -61.47 0.0442
2019-11-08 2019-09-30 13F WESTERN DIGITAL COM 958102105 227,809 -165,923 -42.14 13,587 -27.43 0.1285
2019-08-13 2019-06-30 13F WESTERN DIGITAL COM 958102105 393,732 -40,326 -9.29 18,722 -10.25 0.1800
2019-05-14 2019-03-31 13F WESTERN DIGITAL COM 958102105 434,058 344,445 384.37 20,861 529.67 0.2179
2019-02-06 2018-12-31 13F WESTERN DIGITAL COM 958102105 89,613 89,613 3,313 0.0515
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.