Q2 2026 13F · SEC CIK 1658363

Maple Rock Capital Partners Inc.

Hedge fundFiled 2026-08-14 for Q2 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $5.1B
Reported positions: 51
Top holdings a year, 3 yrs: +48.0%
Assets under management: $6.3B

Maple Rock Capital Partners Inc. is a hedge fund that reported 51 positions worth $5.1B in its Q2 2026 13F, filed 2026-08-14. Its largest holdings were Western Digital Corp (WDC, 17.0%), Seagate Technology Hldngs Pl (STX, 5.7%), Unitedhealth Group Inc Com (UNH, 5.6%). A portfolio copying its top holdings returned 48.0% a year over the last 3 years, against 20.4% for the S&P 500.

Maple Rock Capital Partners Inc. holdings largest 50 of 51 positions.

Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Maple Rock Capital Partners Inc. 13F holdings
Stock	% of 13F value	Q1 2026	Shares	Share change	Reported value
WDCWestern Digital Corp	17.0%	12.3%	1,357,834	-3.0%	$867.3M
STXSeagate Technology Hldngs Pl	5.7%	6.8%	301,162	-43.6%	$290.6M
UNHUnitedhealth Group Inc Com	5.6%	1.9%	681,100	+216.2%	$283.1M
HUMHumana Inc	4.9%	1.9%	628,251	+82.2%	$249.6M
ICLRIcon PLC	4.1%	1.2%	1,199,600	+257.8%	$208.4M
TFIITfi International Inc	4.0%	4.8%	1,418,409	+4.2%	$203.6M
EQXEquinox Gold Corp	3.3%	9.1%	17,531,248	-9.7%	$170.4M
AAPAdvance Auto Parts Inc	3.0%	2.2%	2,421,040	+86.5%	$150.6M
BKDBrookdale Sr Living Inc	2.8%	3.6%	8,888,148	+9.0%	$143.0M
NUENucor Corp	2.7%	0.6%	614,000	+423.8%	$136.8M
BTIBritish Amern Tob PLC	2.6%	3.0%	2,166,000	+36.3%	$133.8M
MTArcelormittal SA Luxembourg Ny Registry	2.6%	2.4%	2,190,860	+54.9%	$131.9M
CVSCvs Caremark Corporation	2.4%	2.4%	1,197,996	+14.3%	$123.9M
SWSmurfit Westrock PLC	2.4%	New	2,608,298	—	$120.7M
LPXLouisiana-Pacific Corporation	2.3%	2.6%	1,521,859	+36.8%	$119.7M
CNCCentene Corp Del	1.7%	0.7%	1,381,879	+110.5%	$88.7M
RKTRocket Cos Inc	1.7%	1.5%	5,543,600	+76.9%	$87.3M
AAAlcoa Corporation	1.6%	1.9%	1,577,720	+74.7%	$82.3M
ARCBArcbest Corp	1.5%	1.3%	535,746	+32.5%	$76.9M
ELVElevance Health Inc Formerly	1.5%	0.6%	191,500	+208.9%	$74.1M
XPOXpo Inc	1.4%	2.0%	352,702	+10.1%	$72.4M
RXORxo Inc	1.4%	New	2,583,655	—	$71.3M
ASTLAlgoma Steel Group	1.3%	2.1%	16,861,818	+5.8%	$68.3M
FDXFFedex Fght Hldg Co Inc	1.3%	New	451,700	—	$68.2M
JDJd.com Inc	1.3%	2.9%	2,670,542	-11.8%	$68.0M
WERNWerner Enterprises Inc	1.2%	0.5%	1,366,167	+146.9%	$59.6M
TPBTurning Pt Brands Inc Com	1.1%	1.2%	686,800	+57.5%	$58.2M
WABWabtec Corp	1.1%	1.8%	215,400	+0.0%	$58.1M
MOSMosaic Co	1.1%	New	2,680,000	—	$56.8M
MOHMolina Healthcare Inc	1.1%	0.7%	243,300	+43.4%	$55.6M
FBHSFortune Brands Innovations I	1.1%	0.6%	996,282	+105.1%	$54.7M
LKQLkq Corp	1.1%	2.0%	2,065,565	+0.0%	$54.4M
RUNSunrun Inc	1.0%	1.3%	3,694,548	+23.1%	$49.4M
WGOWinnebago Industries Inc	1.0%	1.2%	1,559,231	+33.3%	$48.7M
RMBSRambus Inc Del	0.9%	New	342,600	—	$45.5M
NGVTIngevity Corp	0.9%	1.4%	603,303	+0.0%	$45.0M
GPKGraphic Packaging Hldg Co	0.8%	New	4,099,800	—	$43.3M
TECKTeck Resources Ltd	0.8%	New	718,500	—	$42.7M
GMGeneral Mtrs Co	0.8%	New	499,497	—	$38.5M
THOThor Inds Inc	0.7%	1.2%	461,864	+0.0%	$34.7M
TLNTalen Energy Corp	0.6%	New	80,300	—	$30.9M
LVSLas Vegas Sands Corp	0.6%	1.2%	662,824	+0.0%	$30.6M
LYFTLyft Inc	0.6%	1.8%	2,062,351	-50.0%	$30.1M
CLFCleveland-Cliffs Inc	0.6%	5.7%	3,083,157	-85.1%	$29.0M
KNXKnight-Swift Transn Hldgs in	0.6%	0.7%	366,095	+0.0%	$28.5M
ASOAcademy Sports & Outdoors in	0.5%	1.5%	586,400	-30.2%	$27.6M
AMZNAmazon Com Inc Com	0.5%	New	108,000	—	$25.7M
RYAMRayonier Advanced Matls Inc	0.5%	1.2%	3,256,889	+0.0%	$25.6M
HCCWarrior Met Coal, Inc.	0.4%	0.4%	253,559	+77.2%	$20.6M
IPInternational Paper Co	0.2%	New	284,400	—	$10.8M

What Maple Rock Capital Partners Inc. bought and sold in Q2 2026, against Q1 2026.

Left the top 50

Share counts compared with the Q1 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +119.9% /yr; S&P 500 +20.1%
3 years: +48.0% /yr; S&P 500 +20.4%
5 years: +30.1% /yr; S&P 500 +11.6%

A portfolio of the filer's 20 largest 13F positions, weighted by value and rebuilt each quarter on the day the filing became public. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q2 2026	$5.1B	51
Q1 2026	$3.1B	44
Q4 2025	$3.0B	38
Q3 2025	$2.5B	40
Q2 2025	$2.0B	39
Q1 2025	$1.4B	35
Q4 2024	$1.4B	29
Q3 2024	$1.8B	28
Q2 2024	$1.5B	27
Q1 2024	$1.6B	29
Q4 2023	$1.3B	27
Q3 2023	$859.4M	23

Questions about Maple Rock Capital Partners Inc.'s portfolio

What stocks does Maple Rock Capital Partners Inc. own?

Maple Rock Capital Partners Inc.'s latest 13F, for Q2 2026 and filed Aug 14, 2026, lists 51 positions worth $5.1B. The largest are Western Digital Corp (WDC) at 17.0%, Seagate Technology Hldngs Pl (STX) at 5.7%, Unitedhealth Group Inc Com (UNH) at 5.6%, Humana Inc (HUM) at 4.9% and Icon PLC (ICLR) at 4.1%.

What did Maple Rock Capital Partners Inc. buy last quarter?

In Q2 2026, Maple Rock Capital Partners Inc. added a new position in Smurfit Westrock PLC (SW), a new position in Rxo Inc (RXO), a new position in Fedex Fght Hldg Co Inc (FDXF), a new position in Mosaic Co (MOS), a new position in Rambus Inc Del (RMBS), Nucor Corp (NUE) (+423.8% shares), Icon PLC (ICLR) (+257.8% shares) and Unitedhealth Group Inc Com (UNH) (+216.2% shares), compared with its Q1 2026 filing.

What did Maple Rock Capital Partners Inc. sell last quarter?

In Q2 2026, Maple Rock Capital Partners Inc. cut from its top 50 Sandisk Corp (SNDK), cut from its top 50 Goodyear Tire & Rubr Co (GT), cut from its top 50 B2gold Corp (BTG), cut from its top 50 Whirlpool Corp (WHR), cut from its top 50 Avis Budget Group (CAR), Cleveland-Cliffs Inc (CLF) (-85.1% shares), Lyft Inc (LYFT) (-50.0% shares) and Seagate Technology Hldngs Pl (STX) (-43.6% shares), compared with its Q1 2026 filing.

How has Maple Rock Capital Partners Inc.'s portfolio performed?

A portfolio copying Maple Rock Capital Partners Inc.'s 20 largest 13F holdings each quarter, from the day each filing was public, returned +48.0% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +119.9% against +20.1%. Over 5 years: +30.1% a year against +11.6%.

When is Maple Rock Capital Partners Inc.'s next 13F filing due?

13F filings are due 45 days after each quarter ends. Maple Rock Capital Partners Inc.'s filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.

How much money does Maple Rock Capital Partners Inc. manage?

Maple Rock Capital Partners Inc. reported $6.3B of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $5.1B.