Maple Rock Capital Partners Inc.
13F filer · CIK 1658363 · Toronto
Summary
Maple Rock Capital Partners Inc. reported $5.10B across 51 positions in its 13F for 2026 Q2, filed Aug 14, 2026. The largest holdings are WDC (17.0%), STX (5.7%), UNH (5.6%). Versus 2026 Q1, leaving options aside, it opened 11 new positions, added to 25, trimmed 8 and sold out of 4.
Reported value$5.10B
Positions51
Report period2026 Q2
FiledAug 14, 2026
New positions11
Added25
Trimmed8
Sold out4
Top 25 holdings
By reported value, options listed separately · change vs 2026 Q1
Weight 17.0%Value $867.28MPrice $453.23Shares 1.36M -3.04%Since Jun 30 -29.04%
Weight 5.7%Value $290.62MPrice $921.51Shares 301K -43.60%Since Jun 30 -4.51%
Weight 5.6%Value $283.09MPrice $377.83Shares 681K +216.20%Since Jun 30 -9.09%
Weight 4.9%Value $249.55MPrice $389.63Shares 628K +82.21%Since Jun 30 -1.91%
Weight 4.1%Value $208.38MPrice $175.57Shares 1.20M +257.77%Since Jun 30 +1.07%
Weight 4.0%Value $203.64MPrice $122.37Shares 1.42M +4.15%Since Jun 30 -14.77%
Weight 3.3%Value $170.44MPrice $11.23Shares 17.53M -9.75%Since Jun 30 +15.51%
Weight 3.0%Value $150.64MPrice $39.73Shares 2.42M +86.50%Since Jun 30 -36.15%
Weight 2.8%Value $143.01MPrice $10.98Shares 8.89M +8.96%Since Jun 30 -31.76%
Weight 2.7%Value $136.77MPrice $244.49Shares 614K +423.84%Since Jun 30 +9.76%
Weight 2.6%Value $133.77MPrice $54.85Shares 2.17M +36.30%Since Jun 30 -11.19%
Weight 2.6%Value $131.93MPrice $69.85Shares 2.19M +54.91%Since Jun 30 +15.99%
Weight 2.4%Value $123.93MPrice $87.85Shares 1.20M +14.30%Since Jun 30 -15.08%
Weight 2.4%Value $120.66MPrice $45.07Shares 2.61MSince Jun 30 -2.57%
Weight 2.3%Value $119.71MPrice $66.06Shares 1.52M +36.79%Since Jun 30 -16.02%
Weight 1.7%Value $88.70MPrice $62.53Shares 1.38M +110.47%Since Jun 30 -2.59%
Weight 1.7%Value $87.31MPrice $11.64Shares 5.54M +76.93%Since Jun 30 -26.10%
Weight 1.6%Value $82.26MPrice $41.97Shares 1.58M +74.66%Since Jun 30 -19.51%
Weight 1.5%Value $76.90MPrice $128.87Shares 536K +32.50%Since Jun 30 -10.22%
Weight 1.5%Value $74.06MPrice $394.59Shares 192K +208.87%Since Jun 30 +2.03%
Weight 1.4%Value $72.41MPrice $176.66Shares 353K +10.14%Since Jun 30 -13.95%
Weight 1.4%Value $71.28MPrice $20.15Shares 2.58MSince Jun 30 -26.97%
Weight 1.3%Value $68.29MPrice $4.20Shares 16.86M +5.84%Since Jun 30 +3.70%
Weight 1.3%Value $68.21MPrice $112.30Shares 452KSince Jun 30 -25.63%
Weight 1.3%Value $68.05MPrice $26.61Shares 2.67M -11.75%Since Jun 30 +4.43%
| Stock | Weight | Value | Since Jun 30 | Shares change | Action |
|---|---|---|---|---|---|
| 17.0% | $867.28M | -29.04% | -3.04% | Trim | |
| 5.7% | $290.62M | -4.51% | -43.60% | Trim | |
| 5.6% | $283.09M | -9.09% | +216.20% | Add | |
| 4.9% | $249.55M | -1.91% | +82.21% | Add | |
| 4.1% | $208.38M | +1.07% | +257.77% | Add | |
| 4.0% | $203.64M | -14.77% | +4.15% | Add | |
| 3.3% | $170.44M | +15.51% | -9.75% | Trim | |
| 3.0% | $150.64M | -36.15% | +86.50% | Add | |
| 2.8% | $143.01M | -31.76% | +8.96% | Add | |
| 2.7% | $136.77M | +9.76% | +423.84% | Add | |
| 2.6% | $133.77M | -11.19% | +36.30% | Add | |
| 2.6% | $131.93M | +15.99% | +54.91% | Add | |
| 2.4% | $123.93M | -15.08% | +14.30% | Add | |
| 2.4% | $120.66M | -2.57% | — | New | |
| 2.3% | $119.71M | -16.02% | +36.79% | Add | |
| 1.7% | $88.70M | -2.59% | +110.47% | Add | |
| 1.7% | $87.31M | -26.10% | +76.93% | Add | |
| 1.6% | $82.26M | -19.51% | +74.66% | Add | |
| 1.5% | $76.90M | -10.22% | +32.50% | Add | |
| 1.5% | $74.06M | +2.03% | +208.87% | Add | |
| 1.4% | $72.41M | -13.95% | +10.14% | Add | |
| 1.4% | $71.28M | -26.97% | — | New | |
| 1.3% | $68.29M | +3.70% | +5.84% | Add | |
| 1.3% | $68.21M | -25.63% | — | New | |
| 1.3% | $68.05M | +4.43% | -11.75% | Trim |
Weight is the share of the reported 13F value, including options at notional value. “Since Jun 30” compares the latest close with the quarter-end price implied by the filing (value ÷ shares).
Largest buys in 2026 Q2
Largest sells in 2026 Q2
Source: SEC Form 13F, values as reported by the filer. Filings lag up to 45 days after quarter end and cover only certain long positions. Research only, not investment advice.