Western Digital Corporation
CH ˙ BRSE ˙ US9581021055
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityCH:12355 / Western Digital Corporation
InstitutionAPG Asset Management N.V.
Latest Disclosed Ownership181,649 shares
Latest Disclosed Value $ 42,643,845
APG Asset Management N.V. reports 8.77% decrease in ownership of 12355 / Western Digital Corporation

On May 13, 2026 - APG Asset Management N.V. filed a 13F-HR form disclosing ownership of 181,649 shares of Western Digital Corporation (CH:12355) valued at $42,643,845 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 199,117 shares of Western Digital Corporation. This represents a change in shares of -8.77% 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)
2026-05-13 2026-03-31 13F WESTERN DIGITAL COM 958102105 181,649 -17,468 -8.77 42,644 46.01 0.1351
2026-02-12 2025-12-31 13F WESTERN DIGITAL COM 958102105 199,117 -7,756 -3.75 29,207 38.17 0.0829
2025-11-12 2025-09-30 13F WESTERN DIGITAL COM 958102105 206,873 2,700 1.32 21,138 89.92 0.0593
2025-08-12 2025-06-30 13F WESTERN DIGITAL COM 958102105 204,173 6,682 3.38 11,130 50.59 0.0330
2025-05-14 2025-03-31 13F WESTERN DIGITAL COM 958102105 197,491 -7,988 -3.89 7,392 -37.53 0.0229
2025-02-13 2024-12-31 13F WESTERN DIGITAL COM 958102105 205,479 187,050 1,014.98 11,833 949.87 0.0330
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 18,429 -166,016 -90.01 1,128 -91.36 0.0075
2024-08-14 2024-06-30 13F WESTERN DIGITAL COM 958102105 184,445 28,377 18.18 13,040 32.23 0.0233
2024-05-14 2024-03-31 13F WESTERN DIGITAL COM 958102105 156,068 -86,775 -35.73 9,861 -14.34 0.0173
2024-02-13 2023-12-31 13F WESTERN DIGITAL COM 958102105 242,843 -6,608 -2.65 11,513 1.14 0.0225
2023-11-14 2023-09-30 13F WESTERN DIGITAL COM 958102105 249,451 -30,489 -10.89 11,382 16.95 0.0233
2023-08-14 2023-06-30 13F WESTERN DIGITAL COM 958102105 279,940 -5,623 -1.97 9,732 -1.71 0.0196
2023-05-12 2023-03-31 13F WESTERN DIGITAL COM 958102105 285,563 -42,350 -12.92 9,901 98,910.00 0.0210
2023-02-14 2022-12-31 13F WESTERN DIGITAL COM 958102105 327,913 289,473 753.05 10 -99.22 0.0197
2022-11-14 2022-09-30 13F WESTERN DIGITAL COM 958102105 38,440 -15,296 -28.47 1,277 -44.57 0.0033
2022-08-12 2022-06-30 13F WESTERN DIGITAL COM 958102105 53,736 40,397 302.85 2,304 287.23 0.0054
2022-05-12 2022-03-31 13F WESTERN DIGITAL COM 958102105 13,339 -576,264 -97.74 595 -98.24 0.0011
2022-02-11 2021-12-31 13F WESTERN DIGITAL COM 958102105 589,603 39,400 7.16 33,809 26.18 0.0574
2021-11-15 2021-09-30 13F/A-1 WESTERN DIGITAL COM 958102105 550,203 -18,000 -3.17 26,794 -21.43 0.0476
2021-11-15 2021-09-30 13F WESTERN DIGITAL COM 958102105 550,203 -18,000 26,794 0.0482
2021-08-13 2021-06-30 13F WESTERN DIGITAL COM 958102105 568,203 -70,665 -11.06 34,100 -6.02 0.0579
2021-05-14 2021-03-31 13F WESTERN DIGITAL COM 958102105 638,868 91,034 16.62 36,284 46.31 0.0619
2021-02-12 2020-12-31 13F WESTERN DIGITAL COM 958102105 547,834 -11,254 -2.01 24,800 42.32 0.0404
2020-11-12 2020-09-30 13F WESTERN DIGITAL COM 958102105 559,088 133,807 31.46 17,426 4.24 0.0302
2020-08-14 2020-06-30 13F WESTERN DIGITAL COM 958102105 425,281 158,401 59.35 16,717 50.50 0.0305
2020-05-19 2020-03-31 13F/A-2 WESTERN DIGITAL COM 958102105 266,880 117,800 79.02 11,108 31.78 0.0218
2020-05-15 2020-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 266,880 0 11,108 0.0220
2020-05-14 2020-03-31 13F WESTERN DIGITAL COM 958102105 859,363 710,283 36,782 68,817.7396
2020-02-13 2019-12-31 13F WESTERN DIGITAL COM 958102105 149,080 -29,330 -16.44 8,429 -13.64 0.0137
2019-11-08 2019-09-30 13F WESTERN DIGITAL COM 958102105 178,410 1,748 0.99 9,760 32.32 0.0161
2019-08-13 2019-06-30 13F WESTERN DIGITAL COM 958102105 176,662 -682,701 -79.44 7,376 -79.95 0.0127
2019-05-14 2019-03-31 13F WESTERN DIGITAL COM 958102105 859,363 99,000 13.02 36,782 49.58 0.0675
2019-02-19 2018-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 760,363 -204,000 -21.15 24,590 -49.41 0.0500
2019-02-13 2018-12-31 13F WESTERN DIGITAL COM 958102105 760,363 -204,000 24,590
2018-11-09 2018-09-30 13F WESTERN DIGITAL COM 958102105 964,363 0 0.00 48,604 -23.98 0.0851
2018-08-13 2018-06-30 13F WESTERN DIGITAL COM 958102105 964,363 -32,700 -3.28 63,938 -14.53 0.1175
2018-05-14 2018-03-31 13F WESTERN DIGITAL COM 958102105 997,063 -9,227 -0.92 74,805 12.24 0.1446
2018-02-21 2017-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 1,006,290 -27,231 -2.63 66,647 -25.36 0.1219
2018-01-24 2017-12-31 13F WESTERN DIGITAL COM 958102105 1,006,290 -27,231 66,647
2017-10-19 2017-09-30 13F WESTERN DIGITAL COM 958102105 1,033,521 57,200 5.86 89,296 3.23 0.1470
2017-07-21 2017-06-30 13F WESTERN DIGITAL COM 958102105 976,321 -218,388 -18.28 86,502 -12.27 0.1571
2017-05-01 2017-03-31 13F WESTERN DIGITAL COM 958102105 1,194,709 -219,235 -15.51 98,599 8.24 0.1807
2017-01-30 2016-12-31 13F WESTERN DIGITAL COM 958102105 1,413,944 -82,424 -5.51 91,090 4.11 0.1713
2016-10-31 2016-09-30 13F WESTERN DIGITAL COM 958102105 1,496,368 -1,320,835 -46.88 87,493 -34.29 0.1537
2016-08-11 2016-06-30 13F WESTERN DIGITAL COM 958102105 2,817,203 220,980 8.51 133,141 8.56 0.2506
2016-05-16 2016-03-31 13F WESTERN DIGITAL COM 958102105 2,596,223 -56,300 -2.12 122,646 -23.00 0.2545
2016-02-17 2015-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 2,652,523 -213,469 -7.45 159,284 -30.04 0.3668
2016-02-16 2015-12-31 13F WESTERN DIGITAL COM 958102105 606,886 159,284
2015-11-12 2015-09-30 13F WESTERN DIGITAL COM 958102105 2,865,992 -820,204 -22.25 227,674 -21.24 0.5214
2015-08-12 2015-06-30 13F WESTERN DIGITAL COM 958102105 3,686,196 22,184 0.61 289,071 -13.31 0.5799
2015-05-14 2015-03-31 13F WESTERN DIGITAL COM 958102105 3,664,012 -181,606 -4.72 333,462 -21.67 0.6893
2015-02-09 2014-12-31 13F WESTERN DIGITAL COM 958102105 3,845,618 -314,995 -7.57 425,710 5.14 0.8160
2014-11-12 2014-09-30 13F WESTERN DIGITAL COM 958102105 4,160,613 -175,168 -4.04 404,911 1.18 0.8187
2014-08-11 2014-06-30 13F WESTERN DIGITAL COM 958102105 4,335,781 -275,709 -5.98 400,193 -5.49 0.8544
2014-04-30 2014-03-31 13F WESTERN DIGITAL COM 958102105 4,611,490 288,508 6.67 423,427 16.74 1.1063
2014-02-20 2013-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 4,322,982 664,009 18.15 362,698 56.35 1.0662
2014-02-12 2013-12-31 13F WESTERN DIGITAL COM 958102105 4,322,982 362,698
2013-11-13 2013-09-30 13F WESTERN DIGITAL COM 958102105 3,658,973 -27,473 -0.75 231,979 1.35 0.7328
2013-08-14 2013-06-30 13F WESTERN DIGITAL COM 958102105 3,686,446 3,686,446 228,891 0.7145
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.