SEC 13F Intelligence

Managers / Q3 2025 · view latest →

Gagnon Advisors, LLC

CIK 0001599466 · 1370 AVENUE OF THE AMERICAS, 26TH FLOOR, NEW YORK, NY, 10019 · 212-554-5050

Reported Value
$162M
Q3 2025
Positions
24
Filings on Record
32
2019–present window
Filed
Nov 3, 2025
original filing

Summary

Gagnon Advisors, LLC reported $162M in U.S.-listed holdings across 24 positions for Q3 2025.

Its largest position, AMRC, represents 9.8% of the portfolio.

Compared with Q2 2025, the fund opened 3 new positions and exited 3.

Portfolio Metrics

Turnover
+13.6%
vs prior filed quarter
Top-10 Concentration
+64.6%
share of reported value
Largest Position
+9.8%
Ameresco
New / Exited
3 / 3
positions this quarter

Methodology: turnover is min(value bought, value sold) ÷ average reported value across the two quarters — value-based, so market moves inflate it slightly versus a share-based measure. Concentration and largest position are shares of the filing’s total reported value, options excluded. New/exited counts compare against the prior filed quarter. All figures derive solely from the fund’s 13F filings.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $142MQ4 ’18Q1 ’19: $175MQ2 ’19: $175MQ3 ’19: $161MQ4 ’19: $178MQ4 ’19Q1 ’20: $107MQ2 ’20: $139MQ3 ’20: $163MQ4 ’20: $222MQ4 ’20Q1 ’21: $474MQ2 ’21: $263MQ3 ’21: $252MQ4 ’21: $252MQ4 ’21Q1 ’22: $217MQ2 ’22: $165MQ3 ’22: $154MQ4 ’22: $148MQ4 ’22Q1 ’23: $149MQ2 ’23: $149MQ3 ’23: $120MQ4 ’23: $114MQ4 ’23Q1 ’24: $115MQ2 ’24: $131MQ3 ’24: $155MQ4 ’24: $156MQ4 ’24Q1 ’25: $142MQ2 ’25: $149MQ3 ’25: $162MQ4 ’25: $158MQ4 ’25Q1 ’26: $136Mfilingsflow.com

Portfolio Composition

By security type
Common Stock: 81.0%Other: 7.0%MLP: 6.6%REIT: 5.2%ADR: 0.2%
  • Common Stock · 81.0% · $131M
  • Other · 7.0% · $11M
  • MLP · 6.6% · $11M
  • REIT · 5.2% · $8M
  • ADR · 0.2% · $336,704

Quarter-over-Quarter Changes full breakdown →

vs Q2 2025 (amended baseline)

IssuerMoveShare ΔShares nowValue ΔValue now
HZOMarineMax IncNEW+151.8K151.8K+$4M$4M
AMPLAMPLITUDE INCNEW+353.0K353.0K+$4M$4M
CNFCNFINANCE HLDGS LTDNEW+80.4K80.4K+$336,704$336,704
FRSHFRESHWORKS INCADDED+659.3K1.13M+$6M$13M
PSIXPOWER SOLUTIONS INTL INCSOLD OUT−180.4K0−$12M$0
EXKEXACT SCIENCES CORPSOLD OUT−87.0K0−$5M$0
DVDOUBLEVERIFY HLDGS INCADDED+312.9K625.8K+$3M$7M
CNFINANCE HLDGS LTDSOLD OUT−1.57M0−$1M$0

Value changes conflate price moves with buying and selling — share changes are the real signal. Share counts are not split-adjusted.

Holdings — Q3 2025

24 positions
Export to Excel
#IssuerClass% PortfolioValue ↓Shares
1AMRCAMERESCO INChistory →CLA9.80%$16M472.8K
2WGSGENEDX HOLDINGS CORPhistory →COM CL A8.45%$14M127.1K
3FRSHFRESHWORKS INChistory →CLASS A COM8.21%$13M1.13M
4ALAIR LEASE CORPhistory →CL A7.72%$13M196.5K
5EPDENTERPRISE PRODS PARTNERS L Phistory →COM6.56%$11M339.9K
6EQIXEQUINIX INChistory →COM5.18%$8M10.7K
7NAVIGATOR HLDGS LTDSHS4.95%$8M517.1K
8CDNACAREDX INChistory →COM4.75%$8M529.4K
9DVDOUBLEVERIFY HLDGS INChistory →COM4.63%$7M625.8K
10BLFSBIOLIFE SOLUTIONS INChistory →COM NEW4.32%$7M274.2K
11BLBLACKLINE INChistory →COM4.26%$7M130.1K
12TMCITREACE MED CONCEPTS INChistory →COM4.01%$6M968.5K
13VERXVERTEX INChistory →CL A3.56%$6M232.5K
14PCRXPACIRA BIOSCIENCES INChistory →COM3.40%$5M213.4K
15PRNPROFOUND MED CORPhistory →COM NEW2.71%$4M896.7K
16FIVNFIVE9 INChistory →COM2.50%$4M167.4K
17ASPNASPEN AEROGELS INChistory →COM2.43%$4M565.6K
18EP3OraSure Technologies Inchistory →COM2.39%$4M1.21M
19HZOMarineMax Inchistory →COM2.37%$4M151.8K
20AMPLAMPLITUDE INChistory →COM CL A2.34%$4M353.0K
21ALPHA & OMEGA SEMICONDUCTOR LTSHS2.08%$3M120.2K
22NVDANVIDIA CORPORATIONhistory →COM1.91%$3M16.6K
23KLTRKALTURA INChistory →COM1.26%$2M1.41M
24CNFCNFINANCE HLDGS LTDSPON ADS0.21%$336,70480.4K

Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$136M22Apr 22, 202613F-HRchanges · EDGAR ↗
Q4 2025$158M23Feb 13, 202613F-HRchanges · EDGAR ↗
Q3 2025$162M24Nov 3, 202513F-HRchanges · EDGAR ↗
Q2 2025$149M24Jul 23, 202513F-HRchanges · EDGAR ↗
Q1 2025$142M28May 12, 202513F-HRchanges · EDGAR ↗
Q4 2024$156M26Jan 24, 202513F-HRchanges · EDGAR ↗
Q3 2024$155M27Nov 12, 202413F-HRchanges · EDGAR ↗
Q2 2024$131M27Aug 14, 202413F-HRchanges · EDGAR ↗
Q1 2024$115M27May 13, 202413F-HRchanges · EDGAR ↗
Q4 2023$114M26Feb 14, 202413F-HRchanges · EDGAR ↗
Q3 2023$120M28Nov 14, 202313F-HRchanges · EDGAR ↗
Q2 2023$149M29Aug 8, 202313F-HRchanges · EDGAR ↗
Q1 2023$149M28Apr 10, 202313F-HRchanges · EDGAR ↗
Q4 2022$148M29Feb 7, 202313F-HRchanges · EDGAR ↗
Q3 2022$154M32Nov 14, 202213F-HRchanges · EDGAR ↗
Q2 2022$165M33Aug 1, 202213F-HRchanges · EDGAR ↗
Q1 2022$217M33May 9, 202213F-HRchanges · EDGAR ↗
Q4 2021$252M34Feb 8, 202213F-HRchanges · EDGAR ↗
Q3 2021$252M35Nov 12, 202113F-HRchanges · EDGAR ↗
Q2 2021$263M32Jul 28, 202113F-HRchanges · EDGAR ↗
Q1 2021$474M30May 14, 202113F-HRchanges · EDGAR ↗
Q4 2020$222M29Feb 12, 202113F-HRchanges · EDGAR ↗
Q3 2020$163M30Nov 12, 202013F-HRchanges · EDGAR ↗
Q2 2020$139M26Aug 14, 2020RESTATEMENTchanges · EDGAR ↗
Q1 2020$107M27May 11, 202013F-HRchanges · EDGAR ↗
Q4 2019$178M32Feb 14, 202013F-HRchanges · EDGAR ↗
Q3 2019$161M32Nov 8, 201913F-HRchanges · EDGAR ↗
Q2 2019$175M33Aug 12, 201913F-HRchanges · EDGAR ↗
Q1 2019$175M33May 13, 201913F-HRchanges · EDGAR ↗
Q4 2018$142M31Jan 18, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.