GAGNON SECURITIES LLC
Q3 2026 Form 13-F
NEW YORK, NEW YORK
CIK 0001125725
· CRD 103727
· SEC-registered investment adviser
$576.5M Reported Value Total
GAGNON SECURITIES, LLC reports 1,202 total accounts under management (AUM). There are 1,202 discretionary accounts valued at $529,713,650, and 0 non-discretionary accounts.
Source: Form ADV filed * Note that certain holdings are exempt from Form 13-F reporting, so the AUM totals may be greater than the Form 13-F total.
Source: Form ADV filed 2026-08-12
Reported value
$576.5M
Quarter over quarter
+16.7%
Holdings
84
Top-10 concentration
47.3%
Key People
Form ADV owners & control persons
Neil Joseph Gagnon
MANAGER/CEO
Maureen Oneill Drew
MEMBER
Brian Joseph Gagnon
MEMBER
Filing Navigation
Coverage begins with the second quarter of 2013. Earlier quarters are not shown while their accuracy is being verified.
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Q3 2026 13F record
Q3 2026 13F filing summary
| Period of report | September 30, 2026 |
|---|---|
| Filed | November 05, 2026 |
| Form | 13F-HR |
| Reported value | $576.5M |
| Positions | 84 |
| Change in reported value | +13.7% |
| New positions | 8 |
| Exited positions | 6 |
| Position turnover | 15.6% |
| Top-10 concentration | 47.3% |
13F filings by quarter
| Quarter | Positions | Value |
|---|---|---|
|
Q3 2026 13F
Filed Nov 5, 2026
|
84 | $576.5M |
|
Q2 2026 13F
Filed Aug 5, 2026
|
82 | $507.1M |
|
Q1 2026 13F
Filed Apr 22, 2026
|
85 | $433.2M |
|
Q4 2025 13F
Filed Feb 13, 2026
|
86 | $491.1M |
|
Q3 2025 13F
Filed Nov 3, 2025
|
86 | $498.5M |
|
Q2 2025 13F
Filed Jul 23, 2025
|
87 | $492.4M |
|
Q1 2025 13F
Filed May 9, 2025
|
98 | $454.5M |
|
Q4 2024 13F
Filed Jan 24, 2025
|
91 | $496.3M |
|
Q3 2024 13F
Filed Nov 12, 2024
|
102 | $504.4M |
|
Q2 2024 13F
Filed Aug 14, 2024
|
97 | $444.0M |
|
Q1 2024 13F
Filed May 13, 2024
|
98 | $422.5M |
|
Q4 2023 13F
Filed Feb 14, 2024
|
102 | $416.6M |
|
Q3 2023 13F
Filed Nov 14, 2023
|
97 | $399.1M |
|
Q2 2023 13F
Filed Aug 8, 2023
|
97 | $480.9M |
|
Q1 2023 13F
Filed Apr 10, 2023
|
112 | $475.8M |
|
Q4 2022 13F
Filed Feb 7, 2023
|
105 | $452.9M |
|
Q3 2022 13F
Filed Nov 14, 2022
|
101 | $454.8M |
|
Q2 2022 13F
Filed Aug 1, 2022
|
101 | $477.1M |
|
Q1 2022 13F
Filed May 9, 2022
|
103 | $613.2M |
|
Q4 2021 13F
Filed Feb 8, 2022
|
104 | $666.8M |
34 earlier quarters on file — choose one from the quarter menu above.
Top 20 holdings · Q3 2026
| # | Holding | Reported value | % of portfolio |
|---|---|---|---|
| 1 | CDNA CAREDX INC | $69.8M | 12.11% |
| 2 | WGS GENEDX HOLDINGS CORP | $37.3M | 6.47% |
| 3 | ENSG ENSIGN GROUP INC | $28.1M | 4.87% |
| 4 | CAKE CHEESECAKE FACTORY INC | $22.7M | 3.94% |
| 5 | BLFS BIOLIFE SOLUTIONS INC | $20.7M | 3.59% |
| 6 | FRSH FRESHWORKS INC | $20.0M | 3.47% |
| 7 | FIVN FIVE9 INC | $19.3M | 3.34% |
| 8 | AMRC AMERESCO INC | $18.6M | 3.22% |
| 9 | EPD ENTERPRISE PRODS PARTNERS L P | $18.1M | 3.14% |
| 10 | KMX CARMAX INC | $18.0M | 3.12% |
| 11 | HNGE HINGE HEALTH INC | $17.5M | 3.04% |
| 12 | EQIX EQUINIX INC | $16.6M | 2.89% |
| 13 | GNRC GENERAC HLDGS INC | $15.9M | 2.75% |
| 14 | PCRX PACIRA BIOSCIENCES INC | $15.7M | 2.71% |
| 15 | TMCI TREACE MED CONCEPTS INC | $15.2M | 2.63% |
| 16 | AMPL AMPLITUDE INC | $14.2M | 2.47% |
| 17 | NVGS NAVIGATOR HLDGS LTD | $14.1M | 2.44% |
| 18 | BL BLACKLINE INC | $13.8M | 2.39% |
| 19 | QDEL QUIDELORTHO CORP | $13.7M | 2.37% |
| 20 | VERX VERTEX INC | $12.3M | 2.14% |
Values as reported on the Q3 2026 Form 13F. Every position is in the holdings table below.