Gagnon Securities LLC
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed April 22, 2026), Gagnon Securities LLC reported 85 stock positions worth $433.2 million. Its top holding was Ensign (ENSG) at 8.4% of the portfolio, followed by Caredx (CDNA, 7.1%) and Ameresco Class A (AMRC, 4.9%). Compared with Q4 2025, it opened 6 new positions, sold out of 7, added to 38 and reduced 36. The biggest buy was a new position in iShares 0-3 Month Treasury B (SGOV) and the biggest sale an exit from Sumisho Air Lease (AL).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001125725
- Portfolio Value
- $433.2M (Q1 2026)
- SEC Filing
- 0001019056-26-000076 ↗ filed Apr 22, 2026
Holdings Value
Holdings 85 stocks · $433.2M
| ENSG The Ensign Group Inc. | 8.36% | 179,671 | $36.2M | Reduce -0.5% |
| CDNA Caredx Inc. | 7.06% | 1,761,874 | $30.6M | Reduce -0.7% |
| AMRC Ameresco Inc. Class A | 4.94% | 840,063 | $21.4M | Add +0.9% |
| WGS Genedx Holdings Corp. | 4.49% | 303,149 | $19.5M | Add +19.6% |
| EPD Enterprise Products Partners | 4.49% | 514,257 | $19.5M | Reduce -2.5% |
| NVGS Navigator Holdings Ltd. | 3.96% | 886,631 | $17.1M | Add +2.9% |
| EQIX Equinix Inc. | 3.84% | 16,951 | $16.6M | Reduce -1.1% |
| GNRC Generac Holdings Inc. | 3.38% | 74,913 | $14.6M | Reduce -0.9% |
| ISRG Intuitive Surgical Inc. | 3.36% | 31,619 | $14.6M | Reduce -0.6% |
| PCRX Pacira Biosciences Inc. | 3.22% | 617,510 | $14.0M | Add +23.2% |
| FRSH Freshworks Inc. Class A | 3.21% | 1,731,367 | $13.9M | Add +40.8% |
| KMX Carmax Inc. | 2.97% | 309,699 | $12.9M | Reduce -3.2% |
| PROF Profound Medical Corp. | 2.91% | 1,944,324 | $12.6M | Add +0.0% |
| CAKE The Cheesecake Factory Inc. | 2.84% | 225,048 | $12.3M | Reduce -0.7% |
| BL Blackline Inc. | 2.53% | 296,424 | $11.0M | Add +6.1% |
| BLFS Biolife Solutions Inc. | 2.36% | 536,512 | $10.2M | Add +0.4% |
| FIVN FIVE9 Inc. | 2.18% | 622,064 | $9.4M | Reduce -0.6% |
| SGOV iShares 0-3 Month Treasury B | 2.15% | 92,702 | $9.3M | New |
| CARG Cargurus Inc. | 2.13% | 271,524 | $9.2M | Add +0.3% |
| AMPL Amplitude Inc. Class A | 1.67% | 1,059,836 | $7.2M | Add +51.6% |
| TMCI Treace Medical Concepts Inc. | 1.61% | 5,201,886 | $7.0M | Add +67.2% |
| QDEL Quidelortho Corp. | 1.53% | 403,325 | $6.6M | Add +153.4% |
| ASPN Aspen Aerogels Inc. | 1.47% | 1,861,851 | $6.4M | Add +64.3% |
| PRLB Proto Labs Inc. | 1.46% | 110,889 | $6.3M | Reduce -0.6% |
| CELC Celcuity Inc. | 1.41% | 53,342 | $6.1M | Reduce -0.1% |
| HZO Marinemax Inc. | 1.38% | 220,610 | $6.0M | Reduce -31.5% |
| VERX Vertex Inc. Class A | 1.29% | 468,220 | $5.6M | Add +28.4% |
| OSUR Orasure Technologies Inc. | 1.19% | 1,714,391 | $5.1M | Add +9.2% |
| CMG Chipotle Mexican Grill Inc. | 1.17% | 157,849 | $5.1M | Add +0.6% |
| WCPRF Whitecap Resources Inc. | 1.13% | 435,418 | $4.9M | Reduce -10.4% |
| CTRE Caretrust REIT Inc. | 1.13% | 133,046 | $4.9M | Reduce -0.0% |
| HNGE Hinge Health Inc. Class A | 1.11% | 124,250 | $4.8M | New |
| DV Doubleverify Holdings Inc. | 1.07% | 488,462 | $4.6M | Reduce -0.7% |
| PNTG The Pennant Group Inc. | 0.97% | 137,484 | $4.2M | Reduce -0.0% |
| KLTR Kaltura Inc. | 0.92% | 3,278,936 | $4.0M | Add +14.6% |
| ICUI Icu Medical Inc. | 0.89% | 29,743 | $3.8M | Add +2.3% |
| AOSL Alpha & Omega Semiconductor | 0.86% | 167,874 | $3.7M | Reduce -22.1% |
| PTEN Patterson-Uti Energy Inc. | 0.79% | 314,646 | $3.4M | Reduce -10.8% |
| MCHP Microchip Technology Inc. | 0.40% | 26,838 | $1.7M | Reduce -1.2% |
| SAM Boston Beer Company Inc. Class A | 0.39% | 7,239 | $1.7M | Add +13.9% |
| GNL Global Net Lease Inc. | 0.37% | 170,125 | $1.6M | Reduce -0.2% |
| GNTX Gentex Corp. | 0.29% | 56,933 | $1.2M | Add +2.3% |
| PFE Pfizer Inc. | 0.29% | 44,260 | $1.2M | Reduce -0.2% |
| CNF Cnfinance Holdings Ltd. | 0.28% | 313,938 | $1.2M | Reduce -0.9% |
| NCNO Ncino Inc. | 0.28% | 79,520 | $1.2M | Add +8.2% |
| DOCU Docusign Inc. | 0.23% | 21,232 | $1.0M | New |
| NTDOY Nintendo Co. Ltd.-Unspons ADR | 0.23% | 69,697 | $996K | Reduce -0.9% |
| FLG Flagstar Bank NA | 0.23% | 74,711 | $984K | Reduce -0.2% |
| DVN Devon Energy Corp. | 0.22% | 19,066 | $959K | Reduce -0.2% |
| SLG SL Green Realty Corp. | 0.22% | 25,862 | $955K | Add +0.1% |
| T AT&T Inc. | 0.21% | 32,094 | $930K | Reduce -3.4% |
| MTSI Macom Technology Solutions H | 0.19% | 3,670 | $815K | Add +11.4% |
| GOOGL Alphabet Inc. Class A | 0.17% | 2,556 | $735K | No change |
| MRVL Marvell Technology Inc. | 0.16% | 6,825 | $676K | Add +7.9% |
| NVDA Nvidia Corp. | 0.15% | 3,655 | $637K | Reduce -82.2% |
| GOOG Alphabet Inc. Class C | 0.13% | 1,934 | $555K | Reduce -0.3% |
| TECH Bio-Techne Corp. | 0.12% | 9,879 | $516K | Add +2.8% |
| VIAV Viavi Solutions Inc. | 0.11% | 14,511 | $483K | Reduce -39.5% |
| META Meta Platforms Inc. Class A | 0.11% | 839 | $480K | No change |
| CGNX Cognex Corp. | 0.11% | 9,780 | $479K | Add +0.1% |
| SHOP Shopify Inc. Class A | 0.11% | 3,932 | $466K | Add +6.7% |
| ONTO Onto Innovation Inc. | 0.11% | 2,242 | $460K | No change |
| CESDF Ces Energy Solutions Corp. | 0.10% | 33,350 | $440K | Reduce -27.0% |
| GRSD Grandstand Ltd. filed as GAMBLING COM GROUP LIMITED | 0.10% | 109,697 | $426K | Add +3.9% |
| MRK Merck & Co. Inc. | 0.09% | 3,192 | $384K | Reduce -17.5% |
| LTH Life Time Group Holdings Inc. | 0.08% | 13,550 | $365K | Add +0.1% |
| SBUX Starbucks Corp. | 0.08% | 4,071 | $365K | Reduce -26.0% |
| MU Micron Technology Inc. | 0.08% | 1,077 | $364K | No change |
| HIMX Himax Technologies Inc.-ADR | 0.08% | 44,773 | $352K | Reduce -17.0% |
| CVLT Commvault Systems Inc. | 0.08% | 4,376 | $341K | Add +78.4% |
| AKAM Akamai Technologies Inc. | 0.08% | 2,896 | $333K | Add +14.9% |
| RNG Ringcentral Inc. Class A | 0.07% | 8,422 | $313K | Add +3.4% |
| RNTX Rein Therapeutics Inc. | 0.07% | 239,520 | $311K | Reduce -0.3% |
| ETSY Etsy Inc. | 0.07% | 5,773 | $289K | Add +1.4% |
| EOG EOG Resources Inc. | 0.06% | 1,851 | $268K | New |
| APPS Digital Turbine Inc. | 0.05% | 81,839 | $236K | No change |
| RMBS Rambus Inc. | 0.05% | 2,722 | $234K | Add +0.4% |
| PL Planet Labs PBC | 0.05% | 8,352 | $233K | New |
| BX Blackstone Inc. | 0.05% | 1,940 | $223K | Add +31.5% |
| ELVA Electrovaya Inc. | 0.05% | 26,257 | $205K | New |
| MSFT Microsoft Corp. | 0.05% | 545 | $202K | Add +7.3% |
| ATNM Actinium Pharmaceuticals Inc. | 0.05% | 201,300 | $200K | Reduce -0.3% |
| SVV Savers Value Village Inc. | 0.04% | 25,148 | $187K | Add +82.7% |
| WEAV Weave Communications Inc. | 0.04% | 34,220 | $158K | Reduce -51.5% |
| RDHL Redhill Biopharma Ltd.-SP ADR | 0.02% | 88,405 | $66K | Add +2.7% |
Portfolio Sells Q4 2025 → Q1 2026
| AL Sumisho Air Lease Corp. | Sold out | 0.00% | −6.55 |
| EXAS Exact Sciences Corp. | Sold out | 0.00% | −3.49 |
| NVDA Nvidia Corp. | Reduce -82.2% | 0.15% | −0.64 |
| TPR Tapestry Inc. | Sold out | 0.00% | −0.56 |
| FIVN FIVE9 Inc. | Reduce -0.6% | 2.18% | −0.40 |
| ISRG Intuitive Surgical Inc. | Reduce -0.6% | 3.36% | −0.33 |
| HZO Marinemax Inc. | Reduce -31.5% | 1.38% | −0.22 |
| XOM Exxon Mobil Corp. | Sold out | 0.00% | −0.18 |
| CNF Cnfinance Holdings Ltd. | Reduce -0.9% | 0.28% | −0.11 |
| DV Doubleverify Holdings Inc. | Reduce -0.7% | 1.07% | −0.08 |
| PYPL PayPal Holdings Inc. | Sold out | 0.00% | −0.08 |
| WEAV Weave Communications Inc. | Reduce -51.5% | 0.04% | −0.07 |
| PETS Petmed Express Inc. | Sold out | 0.00% | −0.03 |
| GDRX Goodrx Holdings Inc. Class A | Sold out | 0.00% | −0.02 |
| AOSL Alpha & Omega Semiconductor | Reduce -22.1% | 0.86% | −0.02 |
| NTDOY Nintendo Co. Ltd.-Unspons ADR | Reduce -0.9% | 0.23% | −0.01 |
| SBUX Starbucks Corp. | Reduce -26.0% | 0.08% | −0.01 |
| ATNM Actinium Pharmaceuticals Inc. | Reduce -0.3% | 0.05% | −0.01 |
| HIMX Himax Technologies Inc.-ADR | Reduce -17.0% | 0.08% | −0.01 |
| GOOG Alphabet Inc. Class C | Reduce -0.3% | 0.13% | +0.00 |
| MRK Merck & Co. Inc. | Reduce -17.5% | 0.09% | +0.01 |
| RNTX Rein Therapeutics Inc. | Reduce -0.3% | 0.07% | +0.01 |
| CESDF Ces Energy Solutions Corp. | Reduce -27.0% | 0.10% | +0.02 |
| VIAV Viavi Solutions Inc. | Reduce -39.5% | 0.11% | +0.02 |
| FLG Flagstar Bank NA | Reduce -0.2% | 0.23% | +0.03 |
| MCHP Microchip Technology Inc. | Reduce -1.2% | 0.40% | +0.04 |
| T AT&T Inc. | Reduce -3.4% | 0.21% | +0.05 |
| PFE Pfizer Inc. | Reduce -0.2% | 0.29% | +0.06 |
| GNL Global Net Lease Inc. | Reduce -0.2% | 0.37% | +0.07 |
| DVN Devon Energy Corp. | Reduce -0.2% | 0.22% | +0.08 |
| CTRE Caretrust REIT Inc. | Reduce -0.0% | 1.13% | +0.14 |
| PNTG The Pennant Group Inc. | Reduce -0.0% | 0.97% | +0.17 |
| CDNA Caredx Inc. | Reduce -0.7% | 7.06% | +0.19 |
| PRLB Proto Labs Inc. | Reduce -0.6% | 1.46% | +0.30 |
| CELC Celcuity Inc. | Reduce -0.1% | 1.41% | +0.31 |
| PTEN Patterson-Uti Energy Inc. | Reduce -10.8% | 0.79% | +0.34 |
| KMX Carmax Inc. | Reduce -3.2% | 2.97% | +0.43 |
| CAKE The Cheesecake Factory Inc. | Reduce -0.7% | 2.84% | +0.50 |
| EPD Enterprise Products Partners | Reduce -2.5% | 4.49% | +1.02 |
| WCPRF Whitecap Resources Inc. | Reduce -10.4% | 1.13% | +1.13 |
| EQIX Equinix Inc. | Reduce -1.1% | 3.84% | +1.14 |
| GNRC Generac Holdings Inc. | Reduce -0.9% | 3.38% | +1.26 |
| ENSG The Ensign Group Inc. | Reduce -0.5% | 8.36% | +1.90 |
Portfolio Buys Q4 2025 → Q1 2026
| SGOV iShares 0-3 Month Treasury B | New | 2.15% | +2.15 |
| HNGE Hinge Health Inc. Class A | New | 1.11% | +1.11 |
| NVGS Navigator Holdings Ltd. | Add +2.9% | 3.96% | +0.89 |
| ASPN Aspen Aerogels Inc. | Add +64.3% | 1.47% | +0.81 |
| QDEL Quidelortho Corp. | Add +153.4% | 1.53% | +0.60 |
| PCRX Pacira Biosciences Inc. | Add +23.2% | 3.22% | +0.56 |
| OSUR Orasure Technologies Inc. | Add +9.2% | 1.19% | +0.41 |
| DOCU Docusign Inc. | New | 0.23% | +0.23 |
| SAM Boston Beer Company Inc. Class A | Add +13.9% | 0.39% | +0.13 |
| FRSH Freshworks Inc. Class A | Add +40.8% | 3.21% | +0.12 |
| MTSI Macom Technology Solutions H | Add +11.4% | 0.19% | +0.07 |
| EOG EOG Resources Inc. | New | 0.06% | +0.06 |
| PL Planet Labs PBC | New | 0.05% | +0.05 |
| ELVA Electrovaya Inc. | New | 0.05% | +0.05 |
| MRVL Marvell Technology Inc. | Add +7.9% | 0.16% | +0.05 |
| TMCI Treace Medical Concepts Inc. | Add +67.2% | 1.61% | +0.04 |
| CGNX Cognex Corp. | Add +0.1% | 0.11% | +0.04 |
| ICUI Icu Medical Inc. | Add +2.3% | 0.89% | +0.04 |
| AKAM Akamai Technologies Inc. | Add +14.9% | 0.08% | +0.03 |
| RNG Ringcentral Inc. Class A | Add +3.4% | 0.07% | +0.02 |
| GNTX Gentex Corp. | Add +2.3% | 0.29% | +0.02 |
| SVV Savers Value Village Inc. | Add +82.7% | 0.04% | +0.02 |
| CVLT Commvault Systems Inc. | Add +78.4% | 0.08% | +0.02 |
| LTH Life Time Group Holdings Inc. | Add +0.1% | 0.08% | +0.01 |
| AMPL Amplitude Inc. Class A | Add +51.6% | 1.67% | +0.01 |
| BX Blackstone Inc. | Add +31.5% | 0.05% | +0.00 |
| TECH Bio-Techne Corp. | Add +2.8% | 0.12% | +0.00 |
| RMBS Rambus Inc. | Add +0.4% | 0.05% | +0.00 |
| ETSY Etsy Inc. | Add +1.4% | 0.07% | +0.00 |
| CARG Cargurus Inc. | Add +0.3% | 2.13% | +0.00 |
| RDHL Redhill Biopharma Ltd.-SP ADR | Add +2.7% | 0.02% | −0.00 |
| MSFT Microsoft Corp. | Add +7.3% | 0.05% | −0.00 |
| SHOP Shopify Inc. Class A | Add +6.7% | 0.11% | −0.01 |
| GRSD Grandstand Ltd. | Add +3.9% | 0.10% | −0.02 |
| SLG SL Green Realty Corp. | Add +0.1% | 0.22% | −0.02 |
| CMG Chipotle Mexican Grill Inc. | Add +0.6% | 1.17% | −0.03 |
| KLTR Kaltura Inc. | Add +14.6% | 0.92% | −0.04 |
| AMRC Ameresco Inc. Class A | Add +0.9% | 4.94% | −0.06 |
| NCNO Ncino Inc. | Add +8.2% | 0.28% | −0.11 |
| VERX Vertex Inc. Class A | Add +28.4% | 1.29% | −0.21 |
| PROF Profound Medical Corp. | Add +0.0% | 2.91% | −0.23 |
| BLFS Biolife Solutions Inc. | Add +0.4% | 2.36% | −0.29 |
| BL Blackline Inc. | Add +6.1% | 2.53% | −0.64 |
| WGS Genedx Holdings Corp. | Add +19.6% | 4.49% | −2.28 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 83 | $518.8M | CDNA, WGS, ENSG, AMRC, GNRC |
| Q1 2026 | 85 | $433.2M | ENSG, CDNA, AMRC, WGS, EPD |
| Q4 2025 | 86 | $487.0M | CDNA, WGS, AL, ENSG, AMRC |
| Q3 2025 | 86 | $498.5M | AL, ENSG, WGS, AMRC, CDNA |
| Q2 2025 | 87 | $492.4M | AL, ENSG, CDNA, ISRG, WGS |
| Q1 2025 | 98 | $454.5M | AL, ENSG, ISRG, CDNA, WGS |
| Q4 2024 | 91 | $496.3M | AL, ISRG, CDNA, ENSG, WGS |
| Q3 2024 | 102 | $504.4M | CDNA, ENSG, AL, ISRG, WGS |
| Q2 2024 | 97 | $444.0M | AL, CDNA, ENSG, ISRG, PCRX |
| Q1 2024 | 97 | $422.5M | AL, ENSG, CDNA, ISRG, PCRX |