ADAGE CAPITAL PARTNERS GP, L.L.C.

Position in WDC — Western Digital Corp

CIK 1165408 Boston, MA

Position in WDC

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$196,366,160

+$116,913,239 QoQ

Shares Held

307,437

+4.7% QoQ

Ownership

0.085%

of shares outstanding

% of Portfolio

0.28%

of 13F equity value

Holder Rank

#103

of 1,836 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

ADAGE CAPITAL PARTNERS GP, L.L.C. holds $962,796,800 across 7 Computer Hardware names. WDC ranks #2 (20.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SNDK	Sandisk Corp	115,099	$261,704,049
2	WDC	Western Digital Corp This page	307,437	$196,366,160
3	STX	Seagate Technology Holdings plc	200,000	$193,000,000
4	ANET	Arista Networks, Inc.	1,105,900	$187,870,292
5	DELL	Dell Technologies Inc.	232,800	$100,443,888
6	SMCI	Super Micro Computer, Inc.	431,600	$12,658,828
7	HPQ	Hp Inc	490,136	$10,753,583

26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$196,366,160	307,437	+4.7%	Shares	Sole	2026-08-14
2026-03-31	$79,452,921	293,737	+13.6%	Shares	Sole	2026-05-15
2025-12-31	$44,555,395	258,637	+7.4%	Shares	Sole	2026-02-17
2025-09-30	$28,914,890	240,837	-10.6%	Shares	Sole	2025-11-14
2025-06-30	$17,247,672	269,537	+11.2%	Shares	Sole	2025-08-14
2025-03-31	$9,801,727	242,437	-11.2%	Shares	Sole	2025-05-15
2024-12-31	$16,281,193	273,037	-20.3%	Shares	Sole	2025-02-14
2024-09-30	$23,405,493	342,737	+9.4%	Shares	Sole	2024-11-14
2024-06-30	$23,733,986	313,237	-1.5%	Shares	Sole	2024-08-14
2024-03-31	$21,702,826	318,037	+32.6%	Shares	Sole	2024-05-15
2023-12-31	$12,565,507	239,937	-1.3%	Shares	Sole	2024-02-14
2023-09-30	$11,094,342	243,137	-23.7%	Shares	Sole	2023-11-14
2023-06-30	$12,089,698	318,737	-0.3%	Shares	Other	2023-08-14
2023-03-31	$12,044,506	319,737	-1.1%	Shares	Sole	2023-05-15
2022-12-31	$10,194,965	323,137	+1.3%	Shares	Sole	2023-02-14
2022-09-30	$10,384,665	319,037	-2.2%	Shares	Sole	2022-11-14
2022-06-30	$14,620,717	326,137	+12.6%	Shares	Sole	2022-08-15
2022-03-31	$14,385,424	289,737	-12.7%	Shares	Sole	2022-05-16
2021-12-31	$21,652,135	332,037	-46.4%	Shares	Sole	2022-02-14
2021-09-30	$34,972,296	619,637	+31.6%	Shares	Sole	2021-11-15
2021-06-30	$33,509,465	470,837	+71.8%	Shares	Sole	2021-08-16
2021-03-31	$18,298,639	274,137	-4.0%	Shares	Sole	2021-05-17
2020-12-31	$15,815,906	285,537	+5.2%	Shares	Sole	2021-02-16
2020-09-30	$9,924,675	271,537	-5.6%	Shares	Sole	2020-11-16
2020-06-30	$12,694,748	287,537	+20.0%	Shares	Sole	2020-08-14
2020-03-31	$9,969,528	239,537	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.