Maple Rock Capital Partners Inc. — 13F Holdings & Portfolio
CIK 1658363 · latest 13F-HR filed 2026-08-14
Maple Rock Capital Partners Inc. manages $5.10B in 13F-reported U.S. long-equity assets across 51 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are WDC (17.01%), STX (5.70%), UNH (5.55%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 11 new positions, exited 4, added to 28, and trimmed 10.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
TORONTO, A6 M4T 1L9
$5.10B
Long-equity book
51
Distinct positions
2026-06-30
Filed 2026-08-14
+11 / −4 / ↑28 / ↓10
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- WESTERN DIGITAL CORP$488.5M +129.0%
- UNITEDHEALTH GROUP INC$224.8M +385.7%
- HUMANA INC$189.8M +317.4%
- ICON PUB LTD CO$171.3M +461.6%
- NUCOR CORP$116.9M +590.0%
Top Trims
- CLEVELAND-CLIFFS INC NEW-$146.3M -83.5%
- EQUINOX GOLD CORP-$110.4M -39.3%
- SANDISK CORP-$101.5M -95.9%
- LYFT INC-$24.7M -45.1%
- JD.COM INC-$21.4M -24.0%
New Positions
- SMURFIT WESTROCK PLC$120.7M
- RXO INC$71.3M
- FEDEX FGHT HLDG CO INC$68.2M
- MOSAIC CO$56.8M
- RAMBUS INC DEL$45.5M
Exited Positions
- GOODYEAR TIRE & RUBR CO$38.6M
- B2GOLD CORP$37.0M
- WHIRLPOOL CORP$32.0M
- AVIS BUDGET GROUP INC$13.5M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | WESTERN DIGITAL CORP | WDC | 958102105 | $867.3M | 17.01% | 1,357,834 | SH |
| 2 | SEAGATE TECHNOLOGY HLDNGS PL | STX | G7997R103 | $290.6M | 5.70% | 301,162 | SH |
| 3 | UNITEDHEALTH GROUP INC | UNH | 91324P102 | $283.1M | 5.55% | 681,100 | SH |
| 4 | HUMANA INC | HUM | 444859102 | $249.6M | 4.89% | 628,251 | SH |
| 5 | ICON PUB LTD CO | ICLR | G4705A100 | $208.4M | 4.09% | 1,199,600 | SH |
| 6 | TFI INTERNATIONAL INC | TFII | 87241L109 | $203.6M | 3.99% | 1,418,409 | SH |
| 7 | EQUINOX GOLD CORP | EQX | 29446Y502 | $170.4M | 3.34% | 17,531,248 | SH |
| 8 | ADVANCE AUTO PARTS INC | AAP | 00751Y106 | $150.6M | 2.95% | 2,421,040 | SH |
| 9 | BROOKDALE SR LIVING INC | BKD | 112463104 | $143.0M | 2.80% | 8,888,148 | SH |
| 10 | NUCOR CORP | NUE | 670346105 | $136.8M | 2.68% | 614,000 | SH |
| 11 | BRITISH AMERN TOB PLC | BTI | 110448107 | $133.8M | 2.62% | 2,166,000 | SH |
| 12 | ARCELORMITTAL SA LUXEMBOURG | MT | 03938L203 | $131.9M | 2.59% | 2,190,860 | SH |
| 13 | CVS HEALTH CORP | CVS | 126650100 | $123.9M | 2.43% | 1,197,996 | SH |
| 14 | SMURFIT WESTROCK PLC | SW | G8267P108 | $120.7M | 2.37% | 2,608,298 | SH |
| 15 | LOUISIANA PAC CORP | LPX | 546347105 | $119.7M | 2.35% | 1,521,859 | SH |
| 16 | CENTENE CORP DEL | CNC | 15135B101 | $88.7M | 1.74% | 1,381,879 | SH |
| 17 | ROCKET COS INC | RKT | 77311W101 | $87.3M | 1.71% | 5,543,600 | SH |
| 18 | ALCOA CORP | AA | 013872106 | $82.3M | 1.61% | 1,577,720 | SH |
| 19 | ARCBEST CORP | ARCB | 03937C105 | $76.9M | 1.51% | 535,746 | SH |
| 20 | ELEVANCE HEALTH INC FORMERLY | ELV | 036752103 | $74.1M | 1.45% | 191,500 | SH |
| 21 | XPO INC | XPO | 983793100 | $72.4M | 1.42% | 352,702 | SH |
| 22 | RXO INC | RXO | 74982T103 | $71.3M | 1.40% | 2,583,655 | SH |
| 23 | ALGOMA STL GROUP INC | ASTL | 015658107 | $68.3M | 1.34% | 16,861,818 | SH |
| 24 | FEDEX FGHT HLDG CO INC | FDXF | 314352105 | $68.2M | 1.34% | 451,700 | SH |
| 25 | JD.COM INC | JD | 47215P106 | $68.0M | 1.33% | 2,670,542 | SH |
| 26 | WERNER ENTERPRISES INC | WERN | 950755108 | $59.6M | 1.17% | 1,366,167 | SH |
| 27 | TURNING PT BRANDS INC | TPB | 90041L105 | $58.2M | 1.14% | 686,800 | SH |
| 28 | WABTEC | WAB | 929740108 | $58.1M | 1.14% | 215,400 | SH |
| 29 | MOSAIC CO | MOS | 61945C103 | $56.8M | 1.11% | 2,680,000 | SH |
| 30 | MOLINA HEALTHCARE INC | MOH | 60855R100 | $55.6M | 1.09% | 243,300 | SH |
| 31 | FORTUNE BRANDS INNOVATIONS I | FBIN | 34964C106 | $54.7M | 1.07% | 996,282 | SH |
| 32 | LKQ CORP | LKQ | 501889208 | $54.4M | 1.07% | 2,065,565 | SH |
| 33 | SUNRUN INC | RUN | 86771W105 | $49.4M | 0.97% | 3,694,548 | SH |
| 34 | WINNEBAGO INDS INC | WGO | 974637100 | $48.7M | 0.96% | 1,559,231 | SH |
| 35 | RAMBUS INC DEL | RMBS | 750917106 | $45.5M | 0.89% | 342,600 | SH |
| 36 | INGEVITY CORP | NGVT | 45688C107 | $45.0M | 0.88% | 603,303 | SH |
| 37 | GRAPHIC PACKAGING HLDG CO | GPK | 388689101 | $43.3M | 0.85% | 4,099,800 | SH |
| 38 | TECK RESOURCES LTD | TECK | 878742204 | $42.7M | 0.84% | 718,500 | SH |
| 39 | GENERAL MTRS CO | GM | 37045V100 | $38.5M | 0.75% | 499,497 | SH |
| 40 | THOR INDS INC | THO | 885160101 | $34.7M | 0.68% | 461,864 | SH |
| 41 | TALEN ENERGY CORP | TLN | 87422Q109 | $30.9M | 0.61% | 80,300 | SH |
| 42 | LAS VEGAS SANDS CORP | LVS | 517834107 | $30.6M | 0.60% | 662,824 | SH |
| 43 | LYFT INC | LYFT | 55087P104 | $30.1M | 0.59% | 2,062,351 | SH |
| 44 | CLEVELAND-CLIFFS INC NEW | CLF | 185899101 | $29.0M | 0.57% | 3,083,157 | SH |
| 45 | KNIGHT-SWIFT TRANSN HLDGS IN | KNX | 499049104 | $28.5M | 0.56% | 366,095 | SH |
| 46 | ACADEMY SPORTS & OUTDOORS IN | ASO | 00402L107 | $27.6M | 0.54% | 586,400 | SH |
| 47 | AMAZON COM INC | AMZN | 023135106 | $25.7M | 0.50% | 108,000 | SH |
| 48 | RAYONIER ADVANCED MATLS INC | RYAM | 75508B104 | $25.6M | 0.50% | 3,256,889 | SH |
| 49 | WARRIOR MET COAL INC | HCC | 93627C101 | $20.6M | 0.40% | 253,559 | SH |
| 50 | INTERNATIONAL PAPER CO | IP | 460146103 | $10.8M | 0.21% | 284,400 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $5.10B | 51 | 0001658363-26-000007 |
| 2026-03-31 | 2026-05-15 | $3.07B | 44 | 0001658363-26-000005 |
| 2025-12-31 | 2026-02-17 | $3.03B | 38 | 0001658363-26-000003 |
| 2025-09-30 | 2025-11-14 | $2.53B | 41 | 0001658363-25-000005 |