Maple Rock Capital Partners Inc.
SEC Form 13F institutional filer · CIK 0001658363
13F-HR · 11 reported holdings · 2026-03-31
SEC-registered institutional investment manager.
Reported long-US-equity value
$1.04B
Top-10 concentration
98.3%
Maple Rock Capital Partners Inc. — $1.04B AUM allocation strategy
Maple Rock Capital Partners Inc. files SEC Form 13F and reports $1.04B of long US equity value across 11 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 67.0%, followed by Health Care 22.5% and Industrials 5.2%.
The top 10 holdings account for 98% of reported value — a conviction-weighted book concentrated in its best ideas. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
Maple Rock Capital Partners Inc. — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$1.04B
total across 11 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
98% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$CVS +232K sh · +$10.5M+$HUM +172K sh · +$15.6M+$UNH +160K sh · +$40.1M
Biggest trims (shares)
−$WDC −981K sh · −$31.5M−$LVS −718K sh · −$54.2M−$CNC −355K sh · −$20.1M
Exited to nil (held last quarter, gone now)
None this quarter
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Technology Hardware, Storage & Peripherals67.0%—
- Managed Health Care15.2%—
- Health Care Services7.3%—
- Construction Machinery & Heavy Transportation Equipment5.2%—
- Casinos & Gaming3.4%—
- Steel1.9%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
10 of 10 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $WDC | Western Digital Corporation | 1.4M | $379M | -981K | 36.6% |
| $STX | Seagate Technology Holdings PLC | 534K | $209M | -132K | 20.2% |
| $SNDK | Sandisk Corporation | 167K | $106M | -322K | 10.2% |
| $CVS | CVS Health Corporation | 1.05M | $75.3M | +232K | 7.3% |
| $HUM | Humana Inc | 345K | $59.8M | +172K | 5.8% |
| $UNH | UnitedHealth Group Incorporated | 215K | $58.3M | +160K | 5.6% |
| $WAB | Westinghouse Air Brake Technologies Corporation | 215K | $53.8M | — | 5.2% |
| $LVS | Las Vegas Sands Corp | 663K | $35.7M | -718K | 3.4% |
| $CNC | Centene Corporation | 657K | $21.5M | -355K | 2.1% |
| $NUE | Nucor Corporation | 117K | $19.8M | — | 1.9% |
…and 1 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
← All 13F filers·← QuantOrb.pro
How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
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