Vanguard Group Inc ownership in WDC / Western Digital Corporation

Western Digital Corporation

MX ˙ BMV ˙ US9581021055

Security	MX:WDC / Western Digital Corporation
Institution	Vanguard Group Inc
Latest Disclosed Ownership	38,579,938 shares
Ownership	11.90%

2024-02-13 - Vanguard Group Inc has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 38,579,938 shares of Western Digital Corporation (MX:WDC). This represents 11.9 percent ownership of the company. In their previous filing dated 2023-02-09 , Vanguard Group Inc had reported owning 37,341,622 shares, indicating an increase of 3.32 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2024-02-13	2024-02-13	13G/A	37,341,622	38,579,938	3.32	11.90	1.19
2023-02-09	2023-02-09	13G/A	35,190,258	37,341,622	6.11	11.76	4.16
2022-02-10	2022-02-10	13G/A	32,329,856	35,190,258	8.85	11.29	6.21
2021-02-10	2021-02-10	13G/A	35,413,208	32,329,856	-8.71	10.63	-10.67
2020-02-12	2020-02-12	13G/A	31,563,945	35,413,208	12.20	11.90	9.17
2019-02-11	2019-02-11	13G/A	32,055,915	31,563,945	-1.53	10.90	0.65
2018-02-09	2018-02-09	13G/A	28,944,254	32,055,915	10.75	10.83	7.87
2017-05-10	2017-05-10	13G/A	27,490,927	28,944,254	5.29	10.04	4.37
2017-02-10	2017-02-10	13G/A	15,839,359	27,490,927	73.56	9.62	40.85
2016-02-11	2016-02-11	13G/A		15,839,359		6.83
2015-02-10	2015-02-10	13G/A		14,182,472		6.10
2014-02-12	2014-02-12	13G/A		15,557,301		6.58
2013-02-11	2013-02-11	13G/A		14,363,112		5.89
2012-02-10	2012-02-10	13G		13,635,802		5.83

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-01-29	2025-12-31	13F	WESTERN DIGITAL	COM	958102105	42,348,660	-933,733	-2.16	7,295,404	40.39	0.1058
2025-11-07	2025-09-30	13F	WESTERN DIGITAL	COM	958102105	43,282,393	243,177	0.57	5,196,484	88.68	0.0778
2025-08-11	2025-06-30	13F	WESTERN DIGITAL	COM	958102105	43,039,216	100,721	0.23	2,754,079	58.64	0.0446
2025-05-09	2025-03-31	13F	WESTERN DIGITAL	COM	958102105	42,938,495	478,728	1.13	1,736,003	-31.43	0.0314
2025-02-11	2024-12-31	13F	WESTERN DIGITAL	COM	958102105	42,459,767	1,439,149	3.51	2,531,876	-9.62	0.0441
2024-11-13	2024-09-30	13F	WESTERN DIGITAL	COM	958102105	41,020,618	2,192,381	5.65	2,801,298	-4.78	0.0502
2024-08-13	2024-06-30	13F	WESTERN DIGITAL	COM	958102105	38,828,237	301,301	0.78	2,942,016	11.90	0.0565
2024-05-10	2024-03-31	13F	WESTERN DIGITAL	COM	958102105	38,526,936	-53,002	-0.14	2,629,078	30.12	0.0521
2024-03-11	2023-12-31	13F/A-1	WESTERN DIGITAL	COM	958102105	38,579,938	215,207	0.56	2,020,431	15.41	0.0441
2024-02-14	2023-12-31	13F	WESTERN DIGITAL	COM	958102105	38,579,938	215,207		2,020,431		0.0384
2023-12-18	2023-09-30	13F/A-1	WESTERN DIGITAL	COM	958102105	38,364,731	-153,143	-0.40	1,750,583	19.82	0.0430
2023-11-14	2023-09-30	13F	WESTERN DIGITAL	COM	958102105	38,364,731	-153,143		1,750,583		0.0077
2023-08-14	2023-06-30	13F	WESTERN DIGITAL	COM	958102105	38,517,874	799,617	2.12	1,460,983	2.82	0.0346
2023-07-14	2023-03-31	13F/A-1	WESTERN DIGITAL	COM	958102105	37,718,257	376,635	1.01	1,420,847	20.60	0.0362
2023-05-15	2023-03-31	13F	WESTERN DIGITAL	COM	958102105	37,718,257	376,635		1,420,847		0.0362
2023-02-10	2022-12-31	13F	WESTERN DIGITAL	COM	958102105	37,341,622	712,860	1.95	1,178,128	-1.19	0.0321
2022-11-14	2022-09-30	13F	WESTERN DIGITAL	COM	958102105	36,628,762	355,610	0.98	1,192,267	-26.68	0.0351
2022-08-12	2022-06-30	13F	WESTERN DIGITAL	COM	958102105	36,273,152	1,346,393	3.85	1,626,125	-6.23	0.0457
2022-05-13	2022-03-31	13F	WESTERN DIGITAL	COM	958102105	34,926,759	-263,499	-0.75	1,734,114	-24.43	0.0410
2022-02-14	2021-12-31	13F	WESTERN DIGITAL	COM	958102105	35,190,258	1,722,088	5.15	2,294,758	21.48	0.0521
2021-11-12	2021-09-30	13F	WESTERN DIGITAL	COM	958102105	33,468,170	443,663	1.34	1,888,943	-19.63	0.0469
2021-08-13	2021-06-30	13F	WESTERN DIGITAL	COM	958102105	33,024,507	258,140	0.79	2,350,354	7.46	0.0585
2021-05-14	2021-03-31	13F	WESTERN DIGITAL	COM	958102105	32,766,367	436,511	1.35	2,187,155	22.14	0.0592
2021-02-12	2020-12-31	13F	WESTERN DIGITAL	COM	958102105	32,329,856	-162,694	-0.50	1,790,751	50.79	0.0519
2020-11-16	2020-09-30	13F	WESTERN DIGITAL	COM	958102105	32,492,550	-807,932	-2.43	1,187,603	-19.22	0.0393
2020-08-14	2020-06-30	13F	WESTERN DIGITAL	COM	958102105	33,300,482	-2,590,931	-7.22	1,470,216	-1.58	0.0521
2020-05-15	2020-03-31	13F	WESTERN DIGITAL	COM	958102105	35,891,413	478,205	1.35	1,493,801	-33.54	0.0637
2020-02-14	2019-12-31	13F	WESTERN DIGITAL	COM	958102105	35,413,208	1,649,474	4.89	2,247,676	11.62	0.0767
2019-11-14	2019-09-30	13F	WESTERN DIGITAL	COM	958102105	33,763,734	1,658,753	5.17	2,013,669	31.91	0.0747
2019-08-14	2019-06-30	13F	WESTERN DIGITAL	COM	958102105	32,104,981	532,800	1.69	1,526,591	0.61	0.0574
2019-05-15	2019-03-31	13F	WESTERN DIGITAL	COM	958102105	31,572,181	8,236	0.03	1,517,359	30.03	0.0595
2019-02-14	2018-12-31	13F	WESTERN DIGITAL	COM	958102105	31,563,945	207,590	0.66	1,166,919	-36.43	0.0524
2018-12-13	2018-09-30	13F/A-2	WESTERN DIGITAL	COM	958102105	31,356,355	-386,851	-1.22	1,835,600	-25.30	0.0717
2018-11-23	2018-09-30	13F/A-1	WESTERN DIGITAL	COM	958102105	31,356,355	0		1,835,600		0.0717
2018-11-14	2018-09-30	13F	WESTERN DIGITAL	COM	958102105	31,356,355	-386,851		1,835,600
2018-08-14	2018-06-30	13F	WESTERN DIGITAL	COM	958102105	31,743,206	-281,743	-0.88	2,457,240	-16.84	0.1028
2018-05-15	2018-03-31	13F	WESTERN DIGITAL	COM	958102105	32,024,949	-30,966	-0.10	2,954,942	15.91	0.1292
2018-02-14	2017-12-31	13F	WESTERN DIGITAL	COM	958102105	32,055,915	876,813	2.81	2,549,406	-5.36	0.1115
2017-11-14	2017-09-30	13F	WESTERN DIGITAL	COM	958102105	31,179,102	1,236,253	4.13	2,693,874	1.54	0.1259
2017-08-24	2017-06-30	13F/A-1	WESTERN DIGITAL	COM	958102105	29,942,849	1,201,394	4.18	2,652,936	11.84	0.1307
2017-08-11	2017-06-30	13F	WESTERN DIGITAL	COM	958102105	29,942,849	1,201,394		2,652,936
2017-05-12	2017-03-31	13F	WESTERN DIGITAL	COM	958102105	28,741,455	1,250,528	4.55	2,372,032	26.98	0.1219
2017-02-14	2016-12-31	13F	WESTERN DIGITAL	COM	958102105	27,490,927	1,119,638	4.25	1,868,009	21.15	0.1042
2016-11-14	2016-09-30	13F	WESTERN DIGITAL	COM	958102105	26,371,289	1,512,353	6.08	1,541,928	31.25	0.0906
2016-08-10	2016-06-30	13F	WESTERN DIGITAL	COM	958102105	24,858,936	4,925,997	24.71	1,174,834	24.77	0.0730
2016-05-13	2016-03-31	13F	WESTERN DIGITAL	COM	958102105	19,932,939	4,093,580	25.84	941,631	-1.00	0.0610
2016-02-08	2015-12-31	13F	WESTERN DIGITAL	COM	958102105	15,839,359	510,471	3.33	951,154	-21.89	0.0640
2015-11-12	2015-09-30	13F/A-1	WESTERN DIGITAL	COM	958102105	15,328,888	428,678	2.88	1,217,727	4.22	0.0517
2015-11-12	2015-09-30	13F/A-1	WESTERN DIGITAL	COM	958102105	15,328,888	428,678		1,217,727		0.0517
2015-08-13	2015-06-30	13F	WESTERN DIGITAL	COM	958102105	14,900,210	191,033	1.30	1,168,474	-12.71	0.0790
2015-05-15	2015-03-31	13F/A-1	WESTERN DIGITAL	COM	958102105	14,709,177	526,705	3.71	1,338,682	-14.73	0.0908
2015-05-14	2015-03-31	13F	WESTERN DIGITAL	COM	958102105	14,709,177			1,338,682
2015-02-12	2014-12-31	13F	WESTERN DIGITAL	COM	958102105	14,182,472	284,036	2.04	1,570,000	16.07	0.1131
2014-11-12	2014-09-30	13F	WESTERN DIGITAL	COM	958102105	13,898,436	-1,807,307	-11.51	1,352,596	-6.69	0.1054
2014-08-11	2014-06-30	13F	WESTERN DIGITAL	COM	958102105	15,705,743	-313,865	-1.96	1,449,641	-1.45	0.1142
2014-05-13	2014-03-31	13F	WESTERN DIGITAL	COM	958102105	16,019,608	462,307	2.97	1,470,920	12.69	0.1237
2014-02-12	2013-12-31	13F	WESTERN DIGITAL	COM	958102105	15,557,301	660,721	4.44	1,305,258	38.20	0.1148
2013-11-07	2013-09-30	13F	WESTERN DIGITAL	COM	958102105	14,896,580	257,177	1.76	944,444	3.90	0.0922
2013-08-13	2013-06-30	13F	WESTERN DIGITAL	COM	958102105	14,639,403	14,639,403		908,961		0.0955

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.