Merrion Investment Management Co, LLC
SEC Form 13F institutional filer · CIK 0001383782
13F-HR · 76 reported holdings · 2026-03-31
Reported long-US-equity value
$0.13B
Top-10 concentration
54.1%
Merrion Investment Management Co, LLC — $133M AUM allocation strategy
Merrion Investment Management Co, LLC files SEC Form 13F and reports $133M of long US equity value across 76 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 25.1%, followed by Communication Services 15.5% and Financials 8.8%.
The top 10 holdings account for 54% 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.
Merrion Investment Management Co, LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$133M
total across 76 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
54% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$ECHO +17.1K sh · +$2.42M+$MS +500 sh · +$56.4K+$GS +250 sh · +$28.2K
Biggest trims (shares)
−$AIG −1K sh · −$347K−$NFLX −1K sh · −$68.4K−$APO −1K sh · −$340K
Added from nil (new positions)
None this quarter
Exited to nil (held last quarter, gone now)
$LIN ($434K last qtr)$BX ($308K last qtr)$LYB ($229K last qtr)
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)
- Semiconductors10.1%—
- Interactive Media & Services9.6%—
- Technology Hardware, Storage & Peripherals7.2%—
- Wireless Telecommunication Services5.9%—
- Electrical Components & Equipment4.3%—
- Electronic Components4.3%—
- Investment Banking & Brokerage3.7%—
- Multi-Sector Holdings3.7%—
- Other holdings51.3%—
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 |
|---|---|---|---|---|---|
| $GOOGL | Alphabet Inc | 44.2K | $12.7M | +0 | 9.6% |
| $NVDA | NVIDIA Corporation | 64.9K | $11.3M | +0 | 8.5% |
| $AAPL | Apple Inc | 37.8K | $9.59M | +0 | 7.2% |
| $ECHO | EchoStar Corporation | 66.7K | $7.81M | +17.1K | 5.9% |
| $VRT | Vertiv Holdings LLC | 22.5K | $5.64M | +0 | 4.3% |
| $GLW | Corning Incorporated | 41.4K | $5.62M | -150 | 4.2% |
| $GS | Goldman Sachs Group Inc | 5.8K | $4.91M | +250 | 3.7% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 10.2K | $4.91M | +0 | 3.7% |
| $GEV | GE Vernova Inc | 5.52K | $4.82M | -40 | 3.6% |
| $MPC | Marathon Petroleum Corporation | 27.1K | $4.47M | +0 | 3.4% |
…and 66 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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