Gagnon Securities LLC reported 77 positions worth $536.04M for the quarter ended Sep 30, 2026, up 13.3% on the prior quarter. It opened 7 new positions, added to 33, trimmed 23 and exited 5. Its largest holding is CareDx, Inc. at 13% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| NVGS Navigator Holdings Ltd. | +607.6K | – | $14.08M | 2.63% |
| BKD Brookdale Senior Living Inc. | +739.2K | – | $8.01M | 1.49% |
| BV BrightView Holdings, Inc. | +748.4K | – | $7.48M | 1.4% |
| BL Blackline, Inc. | +144.3K | +38.4% | $3.83M | 2.57% |
| VERX Vertex, Inc. | +284.2K | +37.3% | $3.35M | 2.3% |
| QDEL QuidelOrtho Corp | +268.2K | +26.0% | $2.83M | 2.55% |
| TMCI Treace Medical Concepts, Inc. | +386.4K | +12.8% | $1.72M | 2.83% |
| KLTR Kaltura Inc | +1.32M | +40.6% | $1.70M | 1.1% |
| AMRC Ameresco, Inc. | +69.9K | +8.5% | $1.45M | 3.46% |
| OSUR Orasure Technologies Inc | +234.5K | +14.7% | $919.07K | 1.34% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| CDNA CareDx, Inc. | -696.3K | -39.3% | $45.26M | 13.03% |
| HZO Marinemax Inc | -108.3K | -51.2% | $5.66M | 1.01% |
| FIVN Five9, Inc. | -155.9K | -21.6% | $5.30M | 3.6% |
| ENSG Ensign Group, Inc | -10.6K | -6.1% | $1.82M | 5.24% |
| TECH BIO-TECHNE Corp | -12.2K | -100.0% | $864.05K | Exited |
| WEAV Weave Communications, Inc. | -108.0K | -68.7% | $797.24K | 0.068% |
| DV DoubleVerify Holdings, Inc. | -56.2K | -10.7% | $758.58K | 1.18% |
| CAKE Cheesecake Factory Inc | -5,906 | -2.7% | $621.55K | 4.24% |
| WGS GeneDx Holdings Corp. | -8,581 | -1.6% | $620.41K | 6.96% |
| DOCU Docusign, Inc. | -8,747 | -41.8% | $587.36K | 0.152% |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| NVGS Navigator Holdings Ltd. | +607.6K | $14.08M | 2.63% |
| BKD Brookdale Senior Living Inc. | +739.2K | $8.01M | 1.49% |
| BV BrightView Holdings, Inc. | +748.4K | $7.48M | 1.4% |
| TGLS Tecnoglass Holdings Inc. | +13.7K | $485.45K | 0.091% |
| ABT Abbott Laboratories | +4,769 | $471.32K | 0.088% |
| AMT American Tower Corp | +2,776 | $454.40K | 0.085% |
| GRSD GRANDSTAND Ltd | +153.5K | $231.72K | 0.043% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | CDNA CareDx, Inc. | Healthcare | 1.07M | $69.84M | 13.03% | -696.3K | -39.3% | Reduced | 2.05% |
| 2 | WGS GeneDx Holdings Corp. | Healthcare | 516.3K | $37.33M | 6.96% | -8,581 | -1.6% | Reduced | 1.74% |
| 3 | ENSG Ensign Group, Inc | Healthcare | 163.3K | $28.09M | 5.24% | -10.6K | -6.1% | Reduced | 0.28% |
| 4 | CAKE Cheesecake Factory Inc | Consumer Discretionary | 215.9K | $22.72M | 4.24% | -5,906 | -2.7% | Reduced | 0.43% |
| 5 | FRSH Freshworks Inc. | Technology | 1.56M | $19.99M | 3.73% | -1,205 | -0.1% | Reduced | 0.65% |
| 6 | FIVN Five9, Inc. | Technology | 566.8K | $19.28M | 3.6% | -155.9K | -21.6% | Reduced | 0.75% |
| 7 | AMRC Ameresco, Inc. | Industrials | 896.4K | $18.57M | 3.46% | +69.9K | +8.5% | Added | 1.69% |
| 8 | EPD Enterprise Products Partners L.P. | Energy | 509.0K | $18.12M | 3.38% | -1,599 | -0.3% | Reduced | 0.02% |
| 9 | KMX Carmax Inc | Consumer Discretionary | 326.3K | $17.98M | 3.35% | +867 | +0.3% | Added | 0.23% |
| 10 | HNGE Hinge Health, Inc. | Healthcare | 180.2K | $17.52M | 3.27% | -2,796 | -1.5% | Reduced | 0.29% |
| 11 | EQIX Equinix Inc | Technology | 16.5K | $16.64M | 3.1% | -270 | -1.6% | Reduced | 0.02% |
| 12 | GNRC Generac Holdings Inc. | Industrials | 76.7K | $15.87M | 2.96% | +3,514 | +4.8% | Added | 0.13% |
| 13 | PCRX Pacira BioSciences, Inc. | Healthcare | 624.8K | $15.65M | 2.92% | +16.2K | +2.7% | Added | 1.57% |
| 14 | TMCI Treace Medical Concepts, Inc. | Healthcare | 3.42M | $15.17M | 2.83% | +386.4K | +12.8% | Added | 5.25% |
| 15 | AMPL Amplitude, Inc. | Technology | 1.03M | $14.23M | 2.65% | -28.1K | -2.7% | Reduced | 1.02% |
Tip. Select a row to see that position’s full history at Gagnon Securities.
As of its Q3 2026 13F filing, Gagnon Securities LLC’s five largest positions were CareDx, Inc. (CDNA) at 13.0%, GeneDx Holdings Corp. (WGS) at 7.0%, Ensign Group, Inc (ENSG) at 5.2%, Cheesecake Factory Inc (CAKE) at 4.2%, Freshworks Inc. (FRSH) at 3.7% of the reported portfolio.
Gagnon Securities LLC reported a 13F portfolio worth $536.04M across 77 positions for Q3 2026. That is up 13.3% from the previous quarter.
Its largest purchases by value were Navigator Holdings Ltd. ($14.08M), Brookdale Senior Living Inc. ($8.01M), BrightView Holdings, Inc. ($7.48M). It opened 7 new positions.
Its largest sales by value were CareDx, Inc. ($45.26M), Marinemax Inc ($5.66M), Five9, Inc. ($5.30M). It exited 5 positions entirely.
From the Form 13F-HR reports Gagnon Securities LLC files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.