GAGNON SECURITIES LLC — 13F Holdings & Portfolio
CIK 1125725 · latest 13F-HR filed 2026-08-05
GAGNON SECURITIES LLC manages $518.8M in 13F-reported U.S. long-equity assets across 85 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are CDNA (9.73%), WGS (6.94%), ENSG (5.37%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 4 new positions and exited 6; 50 existing positions rose in reported value and 17 fell.
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.
Long-equity book
Distinct positions
Filed 2026-08-05
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
| Name | Title / Status | Ownership | Type |
|---|
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
Top Adds (vs prior quarter)
- CAREDX INC$19.9M +65.0%
- GENEDX HOLDINGS CORP$16.6M +85.1%
- QUIDELORTHO CORP$11.4M +172.3%
- HINGE HEALTH INC$10.4M +217.0%
- GENERAC HLDGS INC$6.8M +46.4%
Top Trims
- ENSIGN GROUP INC-$8.3M -23.0%
- PATTERSON-UTI ENERGY INC-$3.2M -95.3%
- INTUITIVE SURGICAL INC-$3.0M -20.5%
- PFIZER INC-$680.6K -54.8%
- CELCUITY INC-$518.5K -8.5%
New Positions
- GAMBLING COM GROUP$11.7M
- WARBY PARKER INC$345.3K
- VERICEL CORP$324.9K
- BEYOND MEATS INC$286.0K
Exited Positions
- NAVIGATOR HLDGS LTD$17.1M
- ISHARES TR$9.3M
- ALPHA & OMEGA SEMICONDUCTOR LT$3.7M
- GAMBLING COM GROUP LIMITED$425.6K
- EOG RES INC$267.6K
GAGNON SECURITIES LLC Holdings (2026-06-30)
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 | CAREDX INC | CDNA | 14167L103 | $50.5M | 9.73% | 1,770,735 | SH |
| 2 | GENEDX HOLDINGS CORP | WGS | 81663L200 | $36.0M | 6.94% | 524,865 | SH |
| 3 | ENSIGN GROUP INC | ENSG | 29358P101 | $27.9M | 5.37% | 173,911 | SH |
| 4 | AMERESCO INC | AMRC | 02361E108 | $22.8M | 4.40% | 826,562 | SH |
| 5 | GENERAC HLDGS INC | GNRC | 368736104 | $21.4M | 4.13% | 73,170 | SH |
| 6 | ENTERPRISE PRODS PARTNERS L P | EPD | 293792107 | $18.8M | 3.62% | 510,576 | SH |
| 7 | QUIDELORTHO CORP | QDEL | 219798105 | $18.0M | 3.48% | 1,030,371 | SH |
| 8 | CHEESECAKE FACTORY INC | CAKE | 163072101 | $17.6M | 3.40% | 221,792 | SH |
| 9 | EQUINIX INC | EQIX | 29444U700 | $17.4M | 3.36% | 16,720 | SH |
| 10 | CARMAX INC | KMX | 143130102 | $17.2M | 3.32% | 325,410 | SH |
| 11 | FRESHWORKS INC | FRSH | 358054104 | $15.8M | 3.05% | 1,563,866 | SH |
| 12 | PACIRA BIOSCIENCES INC | PCRX | 695127100 | $15.4M | 2.98% | 608,617 | SH |
| 13 | FIVE9 INC | FIVN | 338307101 | $15.4M | 2.97% | 722,698 | SH |
| 14 | HINGE HEALTH INC | HNGE | 433313103 | $15.2M | 2.93% | 182,959 | SH |
| 15 | BIOLIFE SOLUTIONS INC | BLFS | 09062W204 | $15.1M | 2.92% | 535,906 | SH |
| 16 | PROFOUND MED CORP | PROF | 74319B502 | $13.0M | 2.51% | 1,960,074 | SH |
| 17 | CARGURUS INC | CARG | 141788109 | $12.5M | 2.41% | 367,073 | SH |
| 18 | TREACE MED CONCEPTS INC | TMCI | 89455T109 | $12.1M | 2.32% | 3,029,543 | SH |
| 19 | INTUITIVE SURGICAL INC | ISRG | 46120E602 | $11.6M | 2.23% | 29,144 | SH |
| 20 | NAVIGATOR HLDGS LTD | WSDDF | 000000000 | $11.4M | 2.20% | 612,300 | SH |
| 21 | BLACKLINE INC | BL | 09239B109 | $10.5M | 2.03% | 375,769 | SH |
| 22 | ASPEN AEROGELS INC | ASPN | 04523Y105 | $9.7M | 1.88% | 1,535,812 | SH |
| 23 | PROTO LABS INC | PRLB | 743713109 | $9.5M | 1.83% | 116,283 | SH |
| 24 | VERTEX INC | VERX | 92538J106 | $8.7M | 1.68% | 761,026 | SH |
| 25 | AMPLITUDE INC | AMPL | 03213A104 | $8.1M | 1.56% | 1,055,508 | SH |
| 26 | MarineMax Inc | HZO | 567908108 | $7.7M | 1.49% | 211,480 | SH |
| 27 | OraSure Technologies Inc | OSUR | 68554V108 | $7.1M | 1.37% | 1,592,147 | SH |
| 28 | DOUBLEVERIFY HLDGS INC | DV | 25862V105 | $5.7M | 1.09% | 523,328 | SH |
| 29 | CELCUITY INC | CELC | 15102K100 | $5.6M | 1.07% | 53,240 | SH |
| 30 | CHIPOTLE MEXICAN GRILL INC | CMG | 169656105 | $5.3M | 1.02% | 155,463 | SH |
| 31 | CARETRUST REIT INC | CTRE | 14174T107 | $5.2M | 1.01% | 129,955 | SH |
| 32 | PENNANT GROUP INC | PNTG | 70805E109 | $5.0M | 0.96% | 135,035 | SH |
| 33 | WHITECAP RES INC | SPGYF | 96467A200 | $4.5M | 0.87% | 435,100 | SH |
| 34 | ICU MED INC | ICUI | 44930G107 | $4.3M | 0.83% | 29,400 | SH |
| 35 | KALTURA INC | KLTR | 483467106 | $4.2M | 0.82% | 3,266,999 | SH |
| 36 | MICROCHIP TECHNOLOGY INC. | MCHP | 595017104 | $2.4M | 0.46% | 26,229 | SH |
| 37 | GENTEX CORP | GNTX | 371901109 | $1.4M | 0.28% | 57,159 | SH |
| 38 | GLOBAL NET LEASE INC | GNL | 379378201 | $1.4M | 0.28% | 160,598 | SH |
| 39 | SL GREEN RLTY CORP | SLG | 78440X887 | $1.3M | 0.26% | 25,862 | SH |
| 40 | BOSTON BEER INC | SAM | 100557107 | $1.3M | 0.25% | 7,283 | SH |
| 41 | NCINO INC | NCNO | 63947X101 | $1.2M | 0.24% | 75,333 | SH |
| 42 | FLAGSTAR BANK NATIONAL ASSOCIA | FLG | 649445400 | $1.1M | 0.21% | 74,456 | SH |
| 43 | DIGITAL TURBINE INC | APPS | 25400W102 | $1.1M | 0.20% | 81,839 | SH |
| 44 | DOCUSIGN INC | DOCU | 256163106 | $928.6K | 0.18% | 20,906 | SH |
| 45 | CNFINANCE HLDGS LTD | CNF | 18979T204 | $920.6K | 0.18% | 332,345 | SH |
| 46 | ALPHABET INC | GOOGL | 02079K305 | $913.4K | 0.18% | 2,556 | SH |
| 47 | MARVELL TECHNOLOGY INC | MRVL | 573874104 | $870.7K | 0.17% | 2,923 | SH |
| 48 | Bio-Techne Corp | TECH | 09073M104 | $864.0K | 0.17% | 12,230 | SH |
| 49 | DEVON ENERGY CORP | DVN | 25179M103 | $785.9K | 0.15% | 19,021 | SH |
| 50 | MICRON TECHNOLOGY INC | MU | 595112103 | $783.8K | 0.15% | 679 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-05 | $518.8M | 85 | 0001019056-26-000123 |
| 2026-03-31 | 2026-04-22 | $433.2M | 85 | 0001019056-26-000076 |
| 2025-12-31 | 2026-02-13 | $491.1M | 86 | 0001019056-26-000037 |
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