Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionFred Alger Management, Llc
Latest Disclosed Ownership2,659,835 shares
Latest Disclosed Value $ 719,458,769
Fred Alger Management, Llc reports 0.91% decrease in ownership of WDC / Western Digital Corporation

On May 15, 2026 - Fred Alger Management, Llc filed a 13F-HR form disclosing ownership of 2,659,835 shares of Western Digital Corporation (MX:WDC) valued at $719,458,769 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,684,341 shares of Western Digital Corporation. This represents a change in shares of -0.91% 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)
2026-05-15 2026-03-31 13F Western Digital Equity 958102105 2,659,835 -24,506 -0.91 719,459 55.58 3.1602
2026-02-17 2025-12-31 13F Western Digital Equity 958102105 2,684,341 -722,701 -21.21 462,431 13.05 1.8137
2025-11-14 2025-09-30 13F Western Digital Equity 958102105 3,407,042 3,339,225 4,923.88 409,049 9,327.26 1.5920
2025-08-14 2025-06-30 13F Western Digital Equity 958102105 67,817 67,817 4,340 0.0194
2020-11-13 2020-09-30 13F WESTERN DIGITAL Common 958102105 0 -101,476 -100.00 0 -100.00
2020-08-14 2020-06-30 13F WESTERN DIGITAL Common 958102105 101,476 -352,511 -77.65 4,480 -76.29 0.0148
2020-05-19 2020-03-31 13F/A-1 WESTERN DIGITAL Common 958102105 453,987 -303,987 -40.11 18,895 -60.72 0.0830
2020-05-15 2020-03-31 13F WESTERN DIGITAL Common 958102105 453,987 -303,987 18,895 83,133.3755
2020-02-14 2019-12-31 13F WESTERN DIGITAL Common 958102105 757,974 757,974 48,109 0.1771
2019-08-14 2019-06-30 13F WESTERN DIGITAL Common 958102105 0 -174 -100.00 0 -100.00
2019-05-14 2019-03-31 13F WESTERN DIGITAL Common 958102105 174 -551 -76.00 8 -70.37 0.0000
2019-02-14 2018-12-31 13F WESTERN DIGITAL Common 958102105 725 -11,656 -94.14 27 -96.28 0.0001
2018-11-14 2018-09-30 13F WESTERN DIGITAL Common 958102105 12,381 -22 -0.18 725 -24.48 0.0027
2018-07-19 2018-06-30 13F WESTERN DIGITAL Common 958102105 12,403 -202 -1.60 960 -17.45 0.0040
2018-05-10 2018-03-31 13F WESTERN DIGITAL Common 958102105 12,605 -217,174 -94.51 1,163 -93.64 0.0054
2018-02-14 2017-12-31 13F WESTERN DIGITAL Common 958102105 229,779 -1,770,506 -88.51 18,274 -89.43 0.0825
2017-11-14 2017-09-30 13F WESTERN DIGITAL Common 958102105 2,000,285 -821,310 -29.11 172,825 -30.87 0.8084
2017-08-14 2017-06-30 13F WESTERN DIGITAL Common 958102105 2,821,595 593,869 26.66 249,993 35.97 1.1940
2017-05-15 2017-03-31 13F WESTERN DIGITAL Common 958102105 2,227,726 873,181 64.46 183,854 99.75 0.9151
2017-02-14 2016-12-31 13F WESTERN DIGITAL Common 958102105 1,354,545 522,340 62.77 92,041 89.16 0.5008
2016-11-14 2016-09-30 13F WESTERN DIGITAL Common 958102105 832,205 35,484 4.45 48,659 29.23 0.2498
2016-08-15 2016-06-30 13F WESTERN DIGITAL Common 958102105 796,721 796,339 208,465.71 37,653 209,083.33 0.1988
2016-05-16 2016-03-31 13F WESTERN DIGITAL Common 958102105 382 -57,361 -99.34 18 -99.48 0.0001
2016-02-16 2015-12-31 13F WESTERN DIGITAL Common 958102105 57,743 -1,443,489 -96.15 3,467 -97.09 0.0169
2015-11-16 2015-09-30 13F WESTERN DIGITAL Common 958102105 1,501,232 32,335 2.20 119,258 3.53 0.6508
2015-08-14 2015-06-30 13F WESTERN DIGITAL Common 958102105 1,468,897 1,012,737 222.01 115,191 177.47 0.5183
2015-05-15 2015-03-31 13F WESTERN DIGITAL Common 958102105 456,160 -3,150 -0.69 41,515 -18.35 0.1870
2015-02-17 2014-12-31 13F WESTERN DIGITAL Common 958102105 459,310 2,793 0.61 50,845 14.44 0.2447
2014-11-14 2014-09-30 13F WESTERN DIGITAL Common 958102105 456,517 -191,054 -29.50 44,428 -25.67 0.2161
2014-08-14 2014-06-30 13F WESTERN DIGITAL Common 958102105 647,571 -210,977 -24.57 59,771 -24.18 0.2943
2014-05-15 2014-03-31 13F WESTERN DIGITAL Common 958102105 858,548 -367,923 -30.00 78,832 -23.39 0.3907
2014-02-14 2013-12-31 13F WESTERN DIGITAL Common 958102105 1,226,471 682,596 125.51 102,900 198.42 0.5245
2013-11-14 2013-09-30 13F WESTERN DIGITAL Common 958102105 543,875 495,538 1,025.17 34,482 1,049.02 0.1917
2013-08-14 2013-06-30 13F WESTERN DIGITAL Common 958102105 48,337 48,337 3,001 0.0178
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.