Gagnon Advisors, LLC
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 3, 2025), Gagnon Advisors, LLC reported 24 stock positions worth $162.0 million. Its top holding was Ameresco Class A (AMRC) at 9.8% of the portfolio, followed by Genedx (WGS, 8.5%) and Freshworks Class A (FRSH, 8.2%). Compared with Q2 2025, it opened 2 new positions, sold out of 2, added to 6 and reduced 1. The biggest buy was Freshworks Class A (FRSH, shares +140%) and the biggest sale an exit from Power Solutions Internationa (PSIX).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001599466
- Portfolio Value
- $162.0M (Q3 2025)
- SEC Filing
- 0001019056-25-000229 ↗ filed Nov 3, 2025
Holdings Value
Holdings 24 stocks · $162.0M
| AMRC Ameresco Inc. Class A | 9.80% | 472,798 | $15.9M | No change |
| WGS Genedx Holdings Corp. | 8.45% | 127,062 | $13.7M | No change |
| FRSH Freshworks Inc. Class A | 8.21% | 1,129,758 | $13.3M | Add +140.2% |
| AL Sumisho Air Lease Corp. filed as AIR LEASE CORP | 7.72% | 196,479 | $12.5M | No change |
| EPD Enterprise Products Partners | 6.56% | 339,877 | $10.6M | No change |
| EQIX Equinix Inc. | 5.18% | 10,715 | $8.4M | No change |
| NVGS Navigator Holdings Ltd. | 4.95% | 517,066 | $8.0M | No change |
| CDNA Caredx Inc. | 4.75% | 529,414 | $7.7M | Add +16.6% |
| DV Doubleverify Holdings Inc. | 4.63% | 625,770 | $7.5M | Add +100.0% |
| BLFS Biolife Solutions Inc. | 4.32% | 274,217 | $7.0M | No change |
| BL Blackline Inc. | 4.26% | 130,050 | $6.9M | No change |
| TMCI Treace Medical Concepts Inc. | 4.01% | 968,464 | $6.5M | Add +16.6% |
| VERX Vertex Inc. Class A | 3.56% | 232,479 | $5.8M | Add +43.7% |
| PCRX Pacira Biosciences Inc. | 3.40% | 213,402 | $5.5M | No change |
| PROF Profound Medical Corp. | 2.71% | 896,671 | $4.4M | No change |
| FIVN FIVE9 Inc. | 2.50% | 167,386 | $4.1M | No change |
| ASPN Aspen Aerogels Inc. | 2.43% | 565,570 | $3.9M | No change |
| OSUR Orasure Technologies Inc. | 2.39% | 1,207,440 | $3.9M | No change |
| HZO Marinemax Inc. | 2.37% | 151,845 | $3.8M | New |
| AMPL Amplitude Inc. Class A | 2.34% | 352,991 | $3.8M | New |
| AOSL Alpha & Omega Semiconductor | 2.08% | 120,196 | $3.4M | No change |
| NVDA Nvidia Corp. | 1.91% | 16,555 | $3.1M | No change |
| KLTR Kaltura Inc. | 1.26% | 1,413,010 | $2.0M | Add +1.9% |
| CNF Cnfinance Holdings Ltd. | 0.21% | 80,359 | $337K | Reduce -48.8% |
Portfolio Sells Q2 2025 → Q3 2025
Portfolio Buys Q2 2025 → Q3 2025
| FRSH Freshworks Inc. Class A | Add +140.2% | 8.21% | +3.50 |
| HZO Marinemax Inc. | New | 2.37% | +2.37 |
| AMPL Amplitude Inc. Class A | New | 2.34% | +2.34 |
| DV Doubleverify Holdings Inc. | Add +100.0% | 4.63% | +1.48 |
| TMCI Treace Medical Concepts Inc. | Add +16.6% | 4.01% | +0.73 |
| VERX Vertex Inc. Class A | Add +43.7% | 3.56% | −0.28 |
| KLTR Kaltura Inc. | Add +1.9% | 1.26% | −0.62 |
| CDNA Caredx Inc. | Add +16.6% | 4.75% | −1.21 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 23 | $157.3M | CDNA, AMRC, EPD, WGS, EQIX |
| Q1 2026 | 22 | $135.9M | EPD, AMRC, EQIX, NVGS, SGOV |
| Q4 2025 | 23 | $157.5M | WGS, AMRC, AL, EPD, CDNA |
| Q3 2025 | 24 | $162.0M | AMRC, WGS, FRSH, AL, EPD |
| Q2 2025 | 24 | $148.8M | WGS, PSIX, AL, EPD, CDNA |
| Q1 2025 | 28 | $141.8M | EPD, WGS, AL, PSIX, CDNA |
| Q4 2024 | 26 | $156.2M | WGS, PSIX, EPD, AL, CDNA |
| Q3 2024 | 27 | $154.8M | PSIX, CDNA, WGS, EPD, AL |
| Q2 2024 | 27 | $131.3M | EPD, CDNA, AL, NVGS, AOSL |
| Q1 2024 | 26 | $115.3M | AL, EPD, NVGS, BL, FIVN |