GAGNON SECURITIES LLC
Long book
$433.2M
Q1 2026
Positions
85
Top-10 weight
47%
concentration
Last quarter
+20.0%
SPY +14.8%
Turnover
14%
of book per quarter
Strategy in plain words
auto-generated from filingsGAGNON SECURITIES LLC is a diversified fundamental manager, running a $433.2M US long book across 85 positions.
The portfolio is moderately concentrated (top 10 ≈ 47% of the book). Turnover is modest: positions are typically held for years. Current anchor positions: ENSIGN GROUP INC/THE, CAREDX INC, AMERESCO INC-CL A, GENEDX HOLDINGS CORP, ENTERPRISE PRODUCTS PARTNERS.
Over the last 9 quarters its long book ran on average 1.6pp per quarter ahead of the S&P 500, beating the index in 5 of 9 quarters. We rate its filings as signal-bearing: position changes reflect genuine views.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+6.8%
Q2 2024
+19.7%
Q3 2024
+8.4%
Q4 2024
-9.7%
Q1 2025
+10.9%
Q2 2025
+6.5%
Q3 2025
-0.0%
Q4 2025
-7.6%
Q1 2026
+20.0%
Sector allocation
Healthcare 42%
Technology 21%
Industrials 15%
Consumer discretionary 11%
Utilities 5%
Energy 2%
Materials 2%
Consumer staples 0%
Long book by quarter
What does GAGNON SECURITIES own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| ENSG ENSIGN GROUP INC/THE | Healthcare | 179.7K | $36.2M | 8.4% | -0.5% |
| CDNA CAREDX INC | Healthcare | 1.8M | $30.6M | 7.1% | -0.7% |
| AMRC AMERESCO INC-CL A | Industrials | 840.1K | $21.4M | 4.9% | +0.9% |
| WGS GENEDX HOLDINGS CORP | Healthcare | 303.1K | $19.5M | 4.5% | +19.6% |
| EPD ENTERPRISE PRODUCTS PARTNERS | Utilities | 514.3K | $19.5M | 4.5% | -2.5% |
| NVGS NAVIGATOR HOLDINGS LTD | Industrials | 886.6K | $17.1M | 4.0% | +2.9% |
| GNRC GENERAC HOLDINGS INC | Industrials | 74.9K | $14.6M | 3.4% | -0.9% |
| ISRG INTUITIVE SURGICAL INC | Healthcare | 31.6K | $14.6M | 3.4% | -0.6% |
| PCRX PACIRA BIOSCIENCES INC | Healthcare | 617.5K | $14.0M | 3.2% | +23.2% |
| FRSH FRESHWORKS INC-CL A | Technology | 1.7M | $13.9M | 3.2% | +40.8% |
| KMX CARMAX INC | Consumer discretionary | 309.7K | $12.9M | 3.0% | -3.2% |
| PROF PROFOUND MEDICAL CORP | Healthcare | 1.9M | $12.6M | 2.9% | 0.0% |
| CAKE CHEESECAKE FACTORY INC/THE | Consumer discretionary | 225.0K | $12.3M | 2.8% | -0.7% |
| BL BLACKLINE INC | Technology | 296.4K | $11.0M | 2.5% | +6.1% |
| BLFS BIOLIFE SOLUTIONS INC | Healthcare | 536.5K | $10.2M | 2.4% | +0.4% |
| FIVN FIVE9 INC | Technology | 622.1K | $9.4M | 2.2% | -0.6% |
| CARG CARGURUS INC | Technology | 271.5K | $9.2M | 2.1% | +0.3% |
| AMPL AMPLITUDE INC-CLASS A | Technology | 1.1M | $7.2M | 1.7% | +51.6% |
| TMCI TREACE MEDICAL CONCEPTS INC | Healthcare | 5.2M | $7.0M | 1.6% | +67.2% |
| QDEL QUIDELORTHO CORP | Materials | 403.3K | $6.6M | 1.5% | +153.4% |
| ASPN ASPEN AEROGELS INC | Consumer discretionary | 1.9M | $6.4M | 1.5% | +64.3% |
| PRLB PROTO LABS INC | Industrials | 110.9K | $6.3M | 1.5% | -0.6% |
| CELC CELCUITY INC | Healthcare | 53.3K | $6.1M | 1.4% | -0.1% |
| HZO MARINEMAX INC | Consumer discretionary | 220.6K | $6.0M | 1.4% | -31.5% |
| VERX VERTEX INC - CLASS A | Technology | 468.2K | $5.6M | 1.3% | +28.4% |
| OSUR ORASURE TECHNOLOGIES INC | Healthcare | 1.7M | $5.1M | 1.2% | +9.2% |
| CMG CHIPOTLE MEXICAN GRILL INC | Consumer discretionary | 157.8K | $5.1M | 1.2% | +0.6% |
| WCPRF WHITECAP RESOURCES INC | Energy | 435.4K | $4.9M | 1.1% | -10.4% |
| HNGE HINGE HEALTH INC-A | Technology | 124.3K | $4.8M | 1.1% | New |
| DV DOUBLEVERIFY HOLDINGS INC | Technology | 488.5K | $4.6M | 1.1% | -0.7% |
| PNTG PENNANT GROUP INC/THE | Healthcare | 137.5K | $4.2M | 1.0% | 0.0% |
| KLTR KALTURA INC | Technology | 3.3M | $4.0M | 0.9% | +14.6% |
| ICUI ICU MEDICAL INC | Healthcare | 29.7K | $3.8M | 0.9% | +2.3% |
| AOSL ALPHA & OMEGA SEMICONDUCTOR | Technology | 167.9K | $3.7M | 0.9% | -22.2% |
| PTEN PATTERSON-UTI ENERGY INC | Energy | 314.6K | $3.4M | 0.8% | -10.8% |
| MCHP MICROCHIP TECHNOLOGY INC | Technology | 26.8K | $1.7M | 0.4% | -1.2% |
| SAM BOSTON BEER COMPANY INC-A | Consumer staples | 7.2K | $1.7M | 0.4% | +13.9% |
| GNTX GENTEX CORP | Industrials | 56.9K | $1.2M | 0.3% | +2.3% |
| PFE PFIZER INC | Healthcare | 44.3K | $1.2M | 0.3% | -0.2% |
| NCNO NCINO INC | Technology | 79.5K | $1.2M | 0.3% | +8.2% |
| DOCU DOCUSIGN INC | Technology | 21.2K | $1.0M | 0.2% | New |
| FLG FLAGSTAR BANK NA | Financials | 74.7K | $984K | 0.2% | -0.2% |
| DVN DEVON ENERGY CORP | Energy | 19.1K | $959K | 0.2% | -0.2% |
| T AT&T INC | Communications | 32.1K | $930K | 0.2% | -3.4% |
| MTSI MACOM TECHNOLOGY SOLUTIONS H | Technology | 3.7K | $815K | 0.2% | +11.4% |
| GOOGL ALPHABET INC-CL A | Technology | 2.6K | $735K | 0.2% | Held |
| MRVL MARVELL TECHNOLOGY INC | Technology | 6.8K | $676K | 0.2% | +7.9% |
| NVDA NVIDIA CORP | Technology | 3.7K | $637K | 0.1% | -82.2% |
| GOOG ALPHABET INC-CL C | Technology | 1.9K | $555K | 0.1% | -0.3% |
| TECH BIO-TECHNE CORP | Healthcare | 9.9K | $516K | 0.1% | +2.8% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 22, 2026 | 85 | $433.2M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 13, 2026 | 86 | $491.1M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 3, 2025 | 86 | $498.5M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 23, 2025 | 87 | $492.4M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 9, 2025 | 98 | $454.5M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Jan 24, 2025 | 91 | $496.3M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 12, 2024 | 102 | $504.4M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 14, 2024 | 97 | $444.0M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 13, 2024 | 98 | $422.5M | canonical | SEC ↗ |
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