GAGNON SECURITIES LLC — 13F Holdings & Portfolio
CIK 1125725 · latest 13F-HR filed 2026-04-22
GAGNON SECURITIES LLC manages $433.2M in 13F-reported U.S. long-equity assets across 85 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are ENSG (8.36%), CDNA (7.06%), AMRC (4.94%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 6 new positions, exited 7, added to 32, and trimmed 40.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$433.2M
Long-equity book
85
Distinct positions
2026-03-31
Filed 2026-04-22
+6 / −7 / ↑32 / ↓40
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- ENSIGN GROUP INC$4.8M +15.1%
- GENERAC HLDGS INC$4.3M +41.9%
- EQUINIX INC$3.5M +26.5%
- ASPEN AEROGELS INC$3.2M +98.5%
- ENTERPRISE PRODS PARTNERS L P$2.5M +15.0%
Top Trims
- GENEDX HOLDINGS CORP-$13.5M -41.0%
- BLACKLINE INC-$4.5M -29.0%
- INTUITIVE SURGICAL INC-$3.4M -19.1%
- NVIDIA CORPORATION-$3.2M -83.3%
- FIVE9 INC-$3.1M -24.8%
New Positions
- ISHARES TR$9.3M
- HINGE HEALTH INC$4.8M
- DOCUSIGN INC$1.0M
- EOG RES INC$267.6K
- PLANET LABS PBC$233.4K
Exited Positions
- AIR LEASE CORP$31.9M
- EXACT SCIENCES CORP$17.0M
- TAPESTRY INC$2.7M
- EXXON MOBIL CORP$864.0K
- PAYPAL HLDGS INC$385.1K
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | ENSIGN GROUP INC | ENSG | 29358P101 | $36.2M | 8.36% | 179,671 | SH |
| 2 | CAREDX INC | CDNA | 14167L103 | $30.6M | 7.06% | 1,761,874 | SH |
| 3 | AMERESCO INC | AMRC | 02361E108 | $21.4M | 4.94% | 840,063 | SH |
| 4 | GENEDX HOLDINGS CORP | WGS | 81663L200 | $19.5M | 4.49% | 303,149 | SH |
| 5 | ENTERPRISE PRODS PARTNERS L P | EPD | 293792107 | $19.5M | 4.49% | 514,257 | SH |
| 6 | NAVIGATOR HLDGS LTD | NVGS | Y62132108 | $17.1M | 3.96% | 886,631 | SH |
| 7 | EQUINIX INC | EQIX | 29444U700 | $16.6M | 3.84% | 16,951 | SH |
| 8 | GENERAC HLDGS INC | GNRC | 368736104 | $14.6M | 3.38% | 74,913 | SH |
| 9 | INTUITIVE SURGICAL INC | ISRG | 46120E602 | $14.6M | 3.36% | 31,619 | SH |
| 10 | PACIRA BIOSCIENCES INC | PCRX | 695127100 | $14.0M | 3.22% | 617,510 | SH |
| 11 | FRESHWORKS INC | FRSH | 358054104 | $13.9M | 3.21% | 1,731,367 | SH |
| 12 | CARMAX INC | KMX | 143130102 | $12.9M | 2.97% | 309,699 | SH |
| 13 | PROFOUND MED CORP | PROF | 74319B502 | $12.6M | 2.91% | 1,944,324 | SH |
| 14 | CHEESECAKE FACTORY INC | CAKE | 163072101 | $12.3M | 2.84% | 225,048 | SH |
| 15 | BLACKLINE INC | BL | 09239B109 | $11.0M | 2.53% | 296,424 | SH |
| 16 | BIOLIFE SOLUTIONS INC | BLFS | 09062W204 | $10.2M | 2.36% | 536,512 | SH |
| 17 | FIVE9 INC | FIVN | 338307101 | $9.4M | 2.18% | 622,064 | SH |
| 18 | ISHARES TR | SGOV | 46436E718 | $9.3M | 2.15% | 92,702 | SH |
| 19 | CARGURUS INC | CARG | 141788109 | $9.2M | 2.13% | 271,524 | SH |
| 20 | AMPLITUDE INC | AMPL | 03213A104 | $7.2M | 1.67% | 1,059,836 | SH |
| 21 | TREACE MED CONCEPTS INC | TMCI | 89455T109 | $7.0M | 1.61% | 5,201,886 | SH |
| 22 | QUIDELORTHO CORP | QDEL | 219798105 | $6.6M | 1.53% | 403,325 | SH |
| 23 | ASPEN AEROGELS INC | ASPN | 04523Y105 | $6.4M | 1.47% | 1,861,851 | SH |
| 24 | PROTO LABS INC | PRLB | 743713109 | $6.3M | 1.46% | 110,889 | SH |
| 25 | CELCUITY INC | CELC | 15102K100 | $6.1M | 1.41% | 53,342 | SH |
| 26 | MarineMax Inc | HZO | 567908108 | $6.0M | 1.38% | 220,610 | SH |
| 27 | VERICEL CORP | VERX | 92538J106 | $5.6M | 1.29% | 468,220 | SH |
| 28 | OraSure Technologies Inc | OSUR | 68554V108 | $5.1M | 1.19% | 1,714,391 | SH |
| 29 | CHIPOTLE MEXICAN GRILL INC | CMG | 169656105 | $5.1M | 1.17% | 157,849 | SH |
| 30 | WHITECAP RES INC | WCPRF | 96467A200 | $4.9M | 1.13% | 435,418 | SH |
| 31 | CARETRUST REIT INC | CTRE | 14174T107 | $4.9M | 1.13% | 133,046 | SH |
| 32 | HINGE HEALTH INC | HNGE | 433313103 | $4.8M | 1.11% | 124,250 | SH |
| 33 | DOUBLEVERIFY HLDGS INC | DV | 25862V105 | $4.6M | 1.07% | 488,462 | SH |
| 34 | PENNANT GROUP INC | PNTG | 70805E109 | $4.2M | 0.97% | 137,484 | SH |
| 35 | KALTURA INC | KLTR | 483467106 | $4.0M | 0.92% | 3,278,936 | SH |
| 36 | ICU MED INC | ICUI | 44930G107 | $3.8M | 0.89% | 29,743 | SH |
| 37 | ALPHA & OMEGA SEMICONDUCTOR LT | AOSL | G6331P104 | $3.7M | 0.86% | 167,874 | SH |
| 38 | PATTERSON-UTI ENERGY INC | PTEN | 703481101 | $3.4M | 0.79% | 314,646 | SH |
| 39 | MICROCHIP TECHNOLOGY INC. | MCHP | 595017104 | $1.7M | 0.40% | 26,838 | SH |
| 40 | BOSTON BEER INC | SAM | 100557107 | $1.7M | 0.39% | 7,239 | SH |
| 41 | GLOBAL NET LEASE INC | GNL | 379378201 | $1.6M | 0.37% | 170,125 | SH |
| 42 | GENTEX CORP | GNTX | 371901109 | $1.2M | 0.29% | 56,933 | SH |
| 43 | PFIZER INC | PFE | 717081103 | $1.2M | 0.29% | 44,260 | SH |
| 44 | CNFINANCE HLDGS LTD | CNF | 18979T204 | $1.2M | 0.28% | 313,938 | SH |
| 45 | NCINO INC | NCNO | 63947X101 | $1.2M | 0.27% | 79,520 | SH |
| 46 | DOCUSIGN INC | DOCU | 256163106 | $1.0M | 0.23% | 21,232 | SH |
| 47 | NINTENDO LTD | NTDOF | 654445303 | $996.0K | 0.23% | 69,697 | SH |
| 48 | FLAGSTAR BANK NATIONAL ASSOC | FLG | 649445400 | $983.9K | 0.23% | 74,711 | SH |
| 49 | DEVON ENERGY CORP | DVN | 25179M103 | $959.4K | 0.22% | 19,066 | SH |
| 50 | SL GREEN RLTY CORP | SLG | 78440X887 | $955.3K | 0.22% | 25,862 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-04-22 | $433.2M | 85 | 0001019056-26-000076 |
| 2025-12-31 | 2026-02-13 | $491.1M | 86 | 0001019056-26-000037 |