Gagnon Securities LLC
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 3, 2025), Gagnon Securities LLC reported 86 stock positions worth $498.5 million. Its top holding was Sumisho Air Lease (AL) at 7.7% of the portfolio, followed by Ensign (ENSG, 6.3%) and Genedx (WGS, 5.8%). Compared with Q2 2025, it opened 8 new positions, sold out of 9, added to 28 and reduced 47. The biggest buy was Freshworks Class A (FRSH, shares +102%) and the biggest sale Power Solutions Internationa (PSIX, shares −81%).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001125725
- Portfolio Value
- $498.5M (Q3 2025)
- SEC Filing
- 0001019056-25-000228 ↗ filed Nov 3, 2025
Holdings Value
Holdings 86 stocks · $498.5M
| AL Sumisho Air Lease Corp. filed as AIR LEASE CORP | 7.73% | 605,618 | $38.5M | Reduce -17.8% |
| ENSG The Ensign Group Inc. | 6.34% | 183,030 | $31.6M | Reduce -12.4% |
| WGS Genedx Holdings Corp. | 5.82% | 269,066 | $29.0M | Reduce -0.8% |
| AMRC Ameresco Inc. Class A | 5.79% | 859,409 | $28.9M | Reduce -1.3% |
| CDNA Caredx Inc. | 5.04% | 1,729,425 | $25.1M | Add +11.7% |
| FRSH Freshworks Inc. Class A | 4.41% | 1,865,818 | $22.0M | Add +101.8% |
| ISRG Intuitive Surgical Inc. | 3.89% | 43,359 | $19.4M | Reduce -19.4% |
| EPD Enterprise Products Partners | 3.32% | 528,752 | $16.5M | Add +8.4% |
| TMCI Treace Medical Concepts Inc. | 3.04% | 2,258,238 | $15.2M | Add +0.4% |
| BL Blackline Inc. | 2.97% | 278,919 | $14.8M | Add +10.6% |
| BLFS Biolife Solutions Inc. | 2.74% | 535,757 | $13.7M | Reduce -0.8% |
| EQIX Equinix Inc. | 2.71% | 17,253 | $13.5M | Reduce -0.8% |
| NVGS Navigator Holdings Ltd. | 2.69% | 865,860 | $13.4M | Reduce -0.6% |
| GNRC Generac Holdings Inc. | 2.60% | 77,561 | $13.0M | Add +13.7% |
| CAKE The Cheesecake Factory Inc. | 2.49% | 227,336 | $12.4M | Reduce -11.3% |
| ASPN Aspen Aerogels Inc. | 2.45% | 1,754,833 | $12.2M | Reduce -7.6% |
| PCRX Pacira Biosciences Inc. | 2.32% | 449,717 | $11.6M | Add +22.1% |
| CARG Cargurus Inc. | 2.03% | 272,308 | $10.1M | Reduce -16.2% |
| KMX Carmax Inc. | 2.03% | 225,629 | $10.1M | Add +38.1% |
| EXAS Exact Sciences Corp. | 1.97% | 179,442 | $9.8M | Reduce -35.6% |
| VERX Vertex Inc. Class A | 1.88% | 378,685 | $9.4M | Add +40.3% |
| PROF Profound Medical Corp. | 1.70% | 1,733,040 | $8.5M | Reduce -1.0% |
| DV Doubleverify Holdings Inc. | 1.63% | 679,917 | $8.1M | Add +86.3% |
| FIVN FIVE9 Inc. | 1.45% | 299,403 | $7.2M | Reduce -26.5% |
| HZO Marinemax Inc. | 1.33% | 261,349 | $6.6M | New |
| PSIX Power Solutions Internationa | 1.28% | 64,770 | $6.4M | Reduce -81.0% |
| AOSL Alpha & Omega Semiconductor | 1.21% | 215,349 | $6.0M | Reduce -0.3% |
| AMPL Amplitude Inc. Class A | 1.10% | 510,731 | $5.5M | New |
| PRLB Proto Labs Inc. | 1.09% | 108,749 | $5.4M | Reduce -5.1% |
| OSUR Orasure Technologies Inc. | 1.03% | 1,594,771 | $5.1M | Reduce -0.6% |
| CMG Chipotle Mexican Grill Inc. | 0.95% | 120,395 | $4.7M | Reduce -17.9% |
| CTRE Caretrust REIT Inc. | 0.94% | 135,685 | $4.7M | Reduce -9.9% |
| SAM Boston Beer Company Inc. Class A | 0.91% | 21,508 | $4.5M | Reduce -14.1% |
| KLTR Kaltura Inc. | 0.83% | 2,885,976 | $4.2M | Add +32.6% |
| NVDA Nvidia Corp. | 0.77% | 20,573 | $3.8M | Reduce -1.4% |
| WCPRF Whitecap Resources Inc. | 0.74% | 486,570 | $3.7M | Reduce -0.3% |
| QDEL Quidelortho Corp. | 0.72% | 122,499 | $3.6M | Add +68.1% |
| PNTG The Pennant Group Inc. | 0.72% | 141,682 | $3.6M | Reduce -6.5% |
| ICUI Icu Medical Inc. | 0.69% | 28,751 | $3.4M | Reduce -11.0% |
| CELC Celcuity Inc. | 0.53% | 53,955 | $2.7M | Reduce -0.1% |
| TPR Tapestry Inc. | 0.49% | 21,453 | $2.4M | Reduce -8.4% |
| MCHP Microchip Technology Inc. | 0.35% | 27,025 | $1.7M | Reduce -1.5% |
| GNL Global Net Lease Inc. | 0.32% | 193,790 | $1.6M | Add +83.6% |
| GNTX Gentex Corp. | 0.31% | 55,214 | $1.6M | Reduce -2.2% |
| SLG SL Green Realty Corp. | 0.31% | 25,986 | $1.6M | Reduce -0.7% |
| NTDOY Nintendo Co. Ltd.-Unspons ADR | 0.30% | 70,150 | $1.5M | Reduce -2.4% |
| CNF Cnfinance Holdings Ltd. | 0.27% | 317,201 | $1.3M | Add +63.8% |
| PFE Pfizer Inc. | 0.22% | 43,160 | $1.1M | Reduce -0.1% |
| PTEN Patterson-Uti Energy Inc. | 0.22% | 208,697 | $1.1M | Add +2.1% |
| NCNO Ncino Inc. | 0.21% | 38,258 | $1.0M | Add +4.2% |
| T AT&T Inc. | 0.19% | 33,919 | $958K | Add +19.6% |
| FLG Flagstar Bank NA | 0.17% | 74,953 | $866K | Reduce -36.4% |
| XOM Exxon Mobil Corp. | 0.16% | 7,228 | $815K | Reduce -0.1% |
| SHOP Shopify Inc. Class A | 0.16% | 5,345 | $794K | Reduce -6.4% |
| DVN Devon Energy Corp. | 0.14% | 20,278 | $711K | Reduce -0.2% |
| GOOGL Alphabet Inc. Class A | 0.12% | 2,556 | $621K | No change |
| META Meta Platforms Inc. Class A | 0.12% | 839 | $616K | No change |
| TECH Bio-Techne Corp. | 0.11% | 9,614 | $535K | Add +3.7% |
| MRVL Marvell Technology Inc. | 0.11% | 6,327 | $532K | Add +3.8% |
| APPS Digital Turbine Inc. | 0.11% | 81,839 | $524K | No change |
| BLZE Backblaze Inc. Class A | 0.10% | 55,393 | $514K | Add +0.5% |
| MU Micron Technology Inc. | 0.10% | 2,938 | $492K | Reduce -2.2% |
| HIMX Himax Technologies Inc.-ADR | 0.10% | 54,488 | $481K | Reduce -0.2% |
| SBUX Starbucks Corp. | 0.10% | 5,638 | $477K | Reduce -0.1% |
| GOOG Alphabet Inc. Class C | 0.09% | 1,932 | $471K | New |
| CVLT Commvault Systems Inc. | 0.09% | 2,418 | $456K | Reduce -16.0% |
| CGNX Cognex Corp. | 0.09% | 9,772 | $443K | Add +0.5% |
| PYPL PayPal Holdings Inc. | 0.09% | 6,581 | $441K | Add +1.0% |
| MTSI Macom Technology Solutions H | 0.08% | 3,142 | $391K | New |
| LTH Life Time Group Holdings Inc. | 0.07% | 13,538 | $374K | Reduce -0.5% |
| ATNM Actinium Pharmaceuticals Inc. | 0.07% | 226,257 | $362K | Reduce -0.2% |
| MRK Merck & Co. Inc. | 0.07% | 4,038 | $339K | Reduce -0.1% |
| ETSY Etsy Inc. | 0.07% | 4,970 | $330K | Reduce -0.4% |
| CESDF Ces Energy Solutions Corp. | 0.06% | 46,075 | $311K | Reduce -0.2% |
| VIAV Viavi Solutions Inc. | 0.06% | 23,992 | $304K | Add +0.6% |
| WEAV Weave Communications Inc. | 0.06% | 45,543 | $304K | Add +0.7% |
| ONTO Onto Innovation Inc. | 0.06% | 2,242 | $290K | New |
| RMBS Rambus Inc. | 0.06% | 2,711 | $282K | New |
| MSFT Microsoft Corp. | 0.05% | 506 | $262K | Reduce -26.9% |
| RNTX Rein Therapeutics Inc. | 0.05% | 228,692 | $262K | Add +218.8% |
| RNG Ringcentral Inc. Class A | 0.05% | 8,122 | $230K | Add +1.4% |
| GRSD Grandstand Ltd. filed as GAMBLING COM GROUP LIMITED | 0.04% | 23,062 | $189K | Add +2.8% |
| GDRX Goodrx Holdings Inc. Class A | 0.04% | 44,063 | $186K | Add +0.7% |
| SVV Savers Value Village Inc. | 0.04% | 13,764 | $182K | New |
| PETS Petmed Express Inc. | 0.01% | 23,841 | $60K | Reduce -0.2% |
| RDHL Redhill Biopharma Ltd.-SP ADR | 0.01% | 17,822 | $39K | New |
Portfolio Sells Q2 2025 → Q3 2025
| PSIX Power Solutions Internationa | Reduce -81.0% | 1.28% | −3.21 |
| ISRG Intuitive Surgical Inc. | Reduce -19.4% | 3.89% | −2.05 |
| EXAS Exact Sciences Corp. | Reduce -35.6% | 1.97% | −1.04 |
| AL Sumisho Air Lease Corp. | Reduce -17.8% | 7.73% | −1.02 |
| CAKE The Cheesecake Factory Inc. | Reduce -11.3% | 2.49% | −0.77 |
| FIVN FIVE9 Inc. | Reduce -26.5% | 1.45% | −0.74 |
| CMG Chipotle Mexican Grill Inc. | Reduce -17.9% | 0.95% | −0.72 |
| PROF Profound Medical Corp. | Reduce -1.0% | 1.70% | −0.40 |
| ENSG The Ensign Group Inc. | Reduce -12.4% | 6.34% | −0.20 |
| PNTG The Pennant Group Inc. | Reduce -6.5% | 0.72% | −0.20 |
| ICUI Icu Medical Inc. | Reduce -11.0% | 0.69% | −0.18 |
| CARG Cargurus Inc. | Reduce -16.2% | 2.03% | −0.18 |
| EQIX Equinix Inc. | Reduce -0.8% | 2.71% | −0.10 |
| TTD Trade Desk Inc./the Class A | Sold out | 0.00% | −0.10 |
| SHOO Steven Madden Ltd. | Sold out | 0.00% | −0.09 |
| FLG Flagstar Bank NA | Reduce -36.4% | 0.17% | −0.08 |
| SAM Boston Beer Company Inc. Class A | Reduce -14.1% | 0.91% | −0.06 |
| DRRX Durect Corporation | Sold out | 0.00% | −0.05 |
| MBLY Mobileye Global Inc. Class A | Sold out | 0.00% | −0.05 |
| NTDOY Nintendo Co. Ltd.-Unspons ADR | Reduce -2.4% | 0.30% | −0.05 |
| WBA Walgreens Boots Alliance Inc. | Sold out | 0.00% | −0.05 |
| MCHP Microchip Technology Inc. | Reduce -1.5% | 0.35% | −0.04 |
| AKAM Akamai Technologies Inc. | Sold out | 0.00% | −0.04 |
| DHX Dhi Group Inc. | Sold out | 0.00% | −0.03 |
| WBD Warner Bros Discovery Inc. | Sold out | 0.00% | −0.03 |
| YEXT Yext Inc. | Sold out | 0.00% | −0.02 |
| MSFT Microsoft Corp. | Reduce -26.9% | 0.05% | −0.02 |
| SLG SL Green Realty Corp. | Reduce -0.7% | 0.31% | −0.02 |
| CVLT Commvault Systems Inc. | Reduce -16.0% | 0.09% | −0.01 |
| SBUX Starbucks Corp. | Reduce -0.1% | 0.10% | −0.01 |
| LTH Life Time Group Holdings Inc. | Reduce -0.5% | 0.07% | −0.01 |
| PETS Petmed Express Inc. | Reduce -0.2% | 0.01% | −0.00 |
| HIMX Himax Technologies Inc.-ADR | Reduce -0.2% | 0.10% | −0.00 |
| MRK Merck & Co. Inc. | Reduce -0.1% | 0.07% | +0.00 |
| XOM Exxon Mobil Corp. | Reduce -0.1% | 0.16% | +0.01 |
| PFE Pfizer Inc. | Reduce -0.1% | 0.22% | +0.01 |
| ATNM Actinium Pharmaceuticals Inc. | Reduce -0.2% | 0.07% | +0.01 |
| CTRE Caretrust REIT Inc. | Reduce -9.9% | 0.94% | +0.01 |
| DVN Devon Energy Corp. | Reduce -0.2% | 0.14% | +0.01 |
| ETSY Etsy Inc. | Reduce -0.4% | 0.07% | +0.02 |
| CESDF Ces Energy Solutions Corp. | Reduce -0.2% | 0.06% | +0.02 |
| MU Micron Technology Inc. | Reduce -2.2% | 0.10% | +0.02 |
| SHOP Shopify Inc. Class A | Reduce -6.4% | 0.16% | +0.03 |
| OSUR Orasure Technologies Inc. | Reduce -0.6% | 1.03% | +0.05 |
| GNTX Gentex Corp. | Reduce -2.2% | 0.31% | +0.06 |
| TPR Tapestry Inc. | Reduce -8.4% | 0.49% | +0.07 |
| WCPRF Whitecap Resources Inc. | Reduce -0.3% | 0.74% | +0.08 |
| AOSL Alpha & Omega Semiconductor | Reduce -0.3% | 1.21% | +0.08 |
| NVDA Nvidia Corp. | Reduce -1.4% | 0.77% | +0.10 |
| PRLB Proto Labs Inc. | Reduce -5.1% | 1.09% | +0.16 |
Portfolio Buys Q2 2025 → Q3 2025
| FRSH Freshworks Inc. Class A | Add +101.8% | 4.41% | +1.61 |
| HZO Marinemax Inc. | New | 1.33% | +1.33 |
| AMPL Amplitude Inc. Class A | New | 1.10% | +1.10 |
| GNRC Generac Holdings Inc. | Add +13.7% | 2.60% | +0.62 |
| PCRX Pacira Biosciences Inc. | Add +22.1% | 2.32% | +0.54 |
| DV Doubleverify Holdings Inc. | Add +86.3% | 1.63% | +0.52 |
| TMCI Treace Medical Concepts Inc. | Add +0.4% | 3.04% | +0.35 |
| QDEL Quidelortho Corp. | Add +68.1% | 0.72% | +0.30 |
| EPD Enterprise Products Partners | Add +8.4% | 3.32% | +0.25 |
| GNL Global Net Lease Inc. | Add +83.6% | 0.32% | +0.15 |
| GOOG Alphabet Inc. Class C | New | 0.09% | +0.09 |
| MTSI Macom Technology Solutions H | New | 0.08% | +0.08 |
| BL Blackline Inc. | Add +10.6% | 2.97% | +0.07 |
| ONTO Onto Innovation Inc. | New | 0.06% | +0.06 |
| RMBS Rambus Inc. | New | 0.06% | +0.06 |
| BLZE Backblaze Inc. Class A | Add +0.5% | 0.10% | +0.04 |
| SVV Savers Value Village Inc. | New | 0.04% | +0.04 |
| RNTX Rein Therapeutics Inc. | Add +218.8% | 0.05% | +0.03 |
| CGNX Cognex Corp. | Add +0.5% | 0.09% | +0.03 |
| T AT&T Inc. | Add +19.6% | 0.19% | +0.03 |
| VIAV Viavi Solutions Inc. | Add +0.6% | 0.06% | +0.01 |
| CNF Cnfinance Holdings Ltd. | Add +63.8% | 0.27% | +0.01 |
| MRVL Marvell Technology Inc. | Add +3.8% | 0.11% | +0.01 |
| TECH Bio-Techne Corp. | Add +3.7% | 0.11% | +0.01 |
| RDHL Redhill Biopharma Ltd.-SP ADR | New | 0.01% | +0.01 |
| RNG Ringcentral Inc. Class A | Add +1.4% | 0.05% | 0.00 |
| NCNO Ncino Inc. | Add +4.2% | 0.21% | −0.00 |
| GDRX Goodrx Holdings Inc. Class A | Add +0.7% | 0.04% | −0.01 |
| PYPL PayPal Holdings Inc. | Add +1.0% | 0.09% | −0.01 |
| WEAV Weave Communications Inc. | Add +0.7% | 0.06% | −0.02 |
| GRSD Grandstand Ltd. | Add +2.8% | 0.04% | −0.02 |
| PTEN Patterson-Uti Energy Inc. | Add +2.1% | 0.22% | −0.03 |
| VERX Vertex Inc. Class A | Add +40.3% | 1.88% | −0.05 |
| KLTR Kaltura Inc. | Add +32.6% | 0.83% | −0.05 |
| KMX Carmax Inc. | Add +38.1% | 2.03% | −0.20 |
| CDNA Caredx Inc. | Add +11.7% | 5.04% | −1.10 |
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 |