Maple Rock Capital Partners Inc.

Position in WDC — Western Digital Corp

CIK 1658363 Toronto, A6

Back to WDC Full portfolio

Position in WDC

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

Position Value

$867,275,732

+$488,472,340 QoQ

Shares Held

1,357,834

-3.0% QoQ

Ownership

0.377%

of shares outstanding

% of Portfolio

17.01%

of 13F equity value

Holder Rank

#37

of 1,836 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in WDC Over Time

Shares Held

Position Value (USD)

Derivatives in WDC

reported options exposure · as of Mar 31, 2024

CallValue

$102,359,914

CallShares

1,984,500

PutValue

PutShares

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Computer Hardware

Technology · as of Jun 30, 2026

Maple Rock Capital Partners Inc. holds $1,162,230,791 across 3 Computer Hardware names. WDC ranks #1 (74.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	WDC	Western Digital Corp This page	1,357,834	$867,275,732
2	STX	Seagate Technology Holdings plc	301,162	$290,621,330
3	SNDK	Sandisk Corp	1,906	$4,333,729

All Filings in WDC

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30 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$867,275,732	1,357,834	-3.0%	Shares	Sole	2026-08-14
2026-03-31	$378,803,392	1,400,434	-41.2%	Shares	Sole	2026-05-15
2025-12-31	$410,265,311	2,381,525	-8.0%	Shares	Sole	2026-02-17
2025-09-30	$310,874,359	2,589,325	-30.7%	Shares	Sole	2025-11-14
2025-06-30	$239,021,591	3,735,296	+17.1%	Shares	Sole	2025-08-14
2025-03-31	$128,963,452	3,189,796	+6.9%	Shares	Sole	2025-05-15
2024-12-31	$177,929,931	2,983,900	-9.2%	Shares	Sole	2025-02-14
2024-09-30	$224,496,389	3,287,400	+13.2%	Shares	Sole	2024-11-14
2024-06-30	$220,037,018	2,904,010	0.0%	Shares	Sole	2024-08-14
2024-03-31	$198,169,477	2,904,010	+2.4%	Shares	Sole	2024-05-15
2024-03-31	$102,359,914	1,500,000	-25.0%	Call	Sole	2024-05-15
2023-12-31	$104,740,057	2,000,000	-0.3%	Call	Sole	2024-02-14
2023-12-31	$148,504,119	2,835,670	+14.1%	Shares	Sole	2024-02-14
2023-09-30	$113,451,388	2,486,333	+29.3%	Shares	Sole	2023-11-14
2023-06-30	$72,943,246	1,923,101	-5.9%	Shares	Sole	2023-08-14
2023-03-31	$77,001,373	2,044,101	+5.0%	Shares	Sole	2023-05-15
2022-12-31	$61,393,133	1,945,901	-13.2%	Shares	Sole	2023-02-14
2022-09-30	$72,983,685	2,242,200	+70.4%	Shares	Sole	2022-11-14
2022-06-30	$58,982,814	1,315,700	+12.5%	Shares	Sole	2022-08-15
2022-03-31	$58,075,535	1,169,700	+45.7%	Shares	Sole	2022-05-16
2021-12-31	$52,363,636	803,000	+15.2%	Shares	Sole	2022-02-14
2021-09-30	$39,338,661	697,000	-32.1%	Shares	Sole	2021-11-15
2021-06-30	$73,020,410	1,026,000	-5.0%	Shares	Sole	2021-08-16
2021-03-31	$72,089,978	1,080,000	+61.2%	Shares	Sole	2021-05-17
2020-12-31	$111,062,571	2,005,100	+101.5%	Call	Sole	2021-02-16
2020-12-31	$37,111,327	670,000	-25.8%	Shares	Sole	2021-02-16
2020-09-30	$33,004,642	903,000	+568.5%	Shares	Sole	2020-11-16
2020-09-30	$36,378,206	995,300	—	Call	Sole	2020-11-16
2020-06-30	$5,963,909	135,083	-57.8%	Shares	Sole	2020-08-14
2020-03-31	$13,321,852	320,083	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.