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 Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$378,803,392

-$31,461,919 QoQ

Shares Held

1,400,434

-41.2% QoQ

Ownership

0.406%

of shares outstanding

% of Portfolio

12.32%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in WDC Over Time

Shares Held

Position Value (USD)

Derivatives in WDC

reported options exposure · as of Mar 31, 2024

CallValue

$77,369,550

CallShares

1,500,000

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 Mar 31, 2026

Maple Rock Capital Partners Inc. holds $693,781,465 across 3 Computer Hardware names. WDC ranks #1 (54.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	WDC	Western Digital Corp This page	1,400,434	$378,803,392
2	STX	Seagate Technology Holdings plc	533,985	$209,193,963
3	SNDK	Sandisk Corp	166,500	$105,784,110

All Filings in WDC

Export CSV

29 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
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	$134,489,744	2,983,900	-9.2%	Shares	Sole	2025-02-14
2024-09-30	$169,687,369	3,287,400	+13.2%	Shares	Sole	2024-11-14
2024-06-30	$166,316,718	2,904,010	0.0%	Shares	Sole	2024-08-14
2024-03-31	$149,787,964	2,904,010	+93.6%	Shares	Sole	2024-05-15
2024-03-31	$77,369,550	1,500,000	-25.0%	Call	Sole	2024-05-15
2023-12-31	$79,168,600	2,000,000	-29.5%	Call	Sole	2024-02-14
2023-12-31	$112,248,011	2,835,670	+14.1%	Shares	Sole	2024-02-14
2023-09-30	$85,753,127	2,486,333	+29.3%	Shares	Sole	2023-11-14
2023-06-30	$55,134,728	1,923,101	-5.9%	Shares	Sole	2023-08-14
2023-03-31	$58,202,096	2,044,101	+5.0%	Shares	Sole	2023-05-15
2022-12-31	$46,404,484	1,945,901	-13.2%	Shares	Sole	2023-02-14
2022-09-30	$55,165,295	2,242,200	+70.4%	Shares	Sole	2022-11-14
2022-06-30	$44,582,626	1,315,700	+12.5%	Shares	Sole	2022-08-15
2022-03-31	$43,896,852	1,169,700	+45.7%	Shares	Sole	2022-05-16
2021-12-31	$39,579,468	803,000	+15.2%	Shares	Sole	2022-02-14
2021-09-30	$29,734,438	697,000	-32.1%	Shares	Sole	2021-11-15
2021-06-30	$55,193,054	1,026,000	-5.0%	Shares	Sole	2021-08-16
2021-03-31	$54,489,780	1,080,000	-46.1%	Shares	Sole	2021-05-17
2020-12-31	$83,947,521	2,005,100	+199.3%	Call	Sole	2021-02-16
2020-12-31	$28,050,890	670,000	-25.8%	Shares	Sole	2021-02-16
2020-09-30	$24,946,819	903,000	-9.3%	Shares	Sole	2020-11-16
2020-09-30	$27,496,754	995,300	+636.8%	Call	Sole	2020-11-16
2020-06-30	$4,507,868	135,083	-57.8%	Shares	Sole	2020-08-14
2020-03-31	$10,069,427	320,083	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.