DOSSIER · 13F-HR · Q2 2026

Maple Rock Capital Partners Inc.

$5.1B in tracked AUM across 51 positions as of Q2 2026.

MR
CIK 0001658363 · last filed Jun 30, 2026
Total AUM
$5.1B
as of Q2 2026
Holdings
51
positions
Whale Score
69
69
tracked
Activity
no data
changes this Q
AI Analysis · Q2 2026
Comprehensive Analysis of SEC 13F Filing: Maple Rock Capital Partners Inc.
1. Portfolio Overview

Maple Rock Capital Partners Inc. reported a significant contraction in portfolio value for the quarter ended September 30, 2025. The total assets under management (AUM) decreased by 29.6%, dropping from $2.04 billion to $1.44 billion. This reduction was driven by a combination of active portfolio deleveraging, substantial position liquidations, and potential market depreciation of existing hol...

The firm executed a high-velocity turnover strategy this quarter. The portfolio structure underwent a major transformation, evidenced by the exit of 24 positions and the initiation of 6 new ones. The number of holdings was streamlined from a higher count (implied by the exit list) to a concentrated list of 22 securities. This suggests a shift toward higher conviction in fewer names rather than broad diversification. With the top 10 positions accounting for approximately 76% of the portfolio, the firm employs a focused, high-conviction investment style with significant idiosyncratic risk.

2. Key Holdings
Analysis generated by 13F Insight from SEC Form 13F filing data · Q2 2026. Methodology

Quarter at a glance — Q2 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q2 2026.

#HoldingValueSharesWeight
01
WDC
WESTERN DIGITAL CORP
$867M1.4M17.0%
02
G7997R103
SEAGATE TECHNOLOGY HLDNGS PL
$291M301K5.7%
03
UNH
UNITEDHEALTH GROUP INC
$283M681K5.6%
04
HUM
HUMANA INC
$250M628K4.9%
05
G4705A100
ICON PUB LTD CO
$208M1.2M4.1%
06
TFII
TFI INTERNATIONAL INC
$204M1.4M4.0%
07
EQX
EQUINOX GOLD CORP
$170M17.5M3.3%
08
AAP
ADVANCE AUTO PARTS INC
$151M2.4M3.0%
09
BKD
BROOKDALE SR LIVING INC
$143M8.9M2.8%
10
NUE
NUCOR CORP
$137M614K2.7%

Filing history

2026Q2Jun 30
$5.1B 68.5%
51 positionsView →
2025Q4Dec 31
$3.0B 110.9%
38 positionsView →
2025Q3Sep 30
$1.4B 29.6%
22 positionsView →
2025Q2Jun 30
$2.0B 25.3%
40 positionsLocked
2025Q1Mar 31
$2.7B 18.0%
41 positionsLocked
2024Q4Dec 31
$3.3B 5.7%
36 positionsLocked
2024Q3Sep 30
$3.5B 19.8%
33 positionsLocked
2024Q2Jun 30
$3.0B 63.5%
34 positionsLocked
2024Q1Mar 31
$1.8B 2.8%
31 positionsLocked
2023Q4Dec 31
$1.8B 54.4%
33 positionsLocked
2023Q3Sep 30
$1.1B 7.4%
26 positionsLocked
2023Q2Jun 30
$1.2B 8.4%
22 positionsLocked
Showing 12 of 39