GAGNON SECURITIES LLC
SEC Form 13F institutional filer · CIK 0001125725
13F-HR · 21 reported holdings · 2026-03-31
Reported long-US-equity value
$0.06B
Top-10 concentration
93.0%
GAGNON SECURITIES LLC — $61.5M AUM allocation strategy
GAGNON SECURITIES LLC files SEC Form 13F and reports $61.5M of long US equity value across 21 reported holdings for 2026-03-31.
Its largest sector bet is Health Care 27.2%, followed by Real Estate 27.0% and Industrials 23.8%.
The top 10 holdings account for 93% 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.
GAGNON SECURITIES LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$61.5M
total across 21 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
93% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$CMG +874 sh · −$755K+$MRVL +498 sh · +$138K+$BX +465 sh · −$4.28K
Biggest trims (shares)
−$NVDA −16.9K sh · −$3.19M−$SBUX −1.43K sh · −$98.6K−$T −1.13K sh · +$105K
Exited to nil (held last quarter, gone now)
$TPR ($2.74M last qtr)$XOM ($864K last qtr)$PYPL ($385K 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)
- Data Center REITs27.0%—
- Heavy Electrical Equipment23.8%—
- Health Care Equipment23.7%—
- Restaurants8.8%—
- Semiconductors5.6%—
- Interactive Media & Services2.9%—
- Pharmaceuticals2.7%—
- Oil & Gas Exploration & Production2.0%—
- Other holdings3.5%—
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 |
|---|---|---|---|---|---|
| $EQIX | Equinix Inc. Common Stock REIT | 17K | $16.6M | -191 | 27.0% |
| $GNRC | Generac Holdlings Inc | 74.9K | $14.6M | -680 | 23.8% |
| $ISRG | Intuitive Surgical Inc | 31.6K | $14.6M | -178 | 23.7% |
| $CMG | Chipotle Mexican Grill Inc | 158K | $5.05M | +874 | 8.2% |
| $MCHP | Microchip Technology Incorporated | 26.8K | $1.73M | -324 | 2.8% |
| $PFE | Pfizer Inc | 44.3K | $1.24M | -93 | 2.0% |
| $DVN | Devon Energy Corporation | 19.1K | $959K | -45 | 1.6% |
| $T | AT&T Inc | 32.1K | $930K | -1.13K | 1.5% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 2.56K | $735K | +0 | 1.2% |
| $MRVL | Marvell Technology Inc | 6.83K | $676K | +498 | 1.1% |
…and 11 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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