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Gagnon Advisors, LLC

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13F filer, CIK 1599466, New York, NY

Gagnon Advisors, LLC reported $157,515,890 across 23 holdings for the quarter ended 2025-12-31, in a 13F-HR filed 2026-02-13. Its ten largest share positions make up 65.25% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001019056-26-000036

Period
2025-12-31
Reported value
$158M
Holdings
23
Top 10 weight
65.25%
New
0
Sold out
1

Part of the filer group GAGNON SECURITIES LLC

How groups are built

Largest buys vs the previous quarter

SecurityShares changeApprox. value
FIVNadded+168,891$3.39M
TMCIadded+565,570$1.39M
PCRXadded+47,506$1.23M
AMPLadded+104,221$1.21M
HZOadded+42,639$1.03M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
FRSHreduced-564,879-$6.92M
ASPNexited-565,570-$3.94M
DVreduced-187,731-$2.15M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q4 2025

Share positions as resolved from 13F-HR 0001019056-26-000036, largest first. % of portfolio is the value over $157,515,890, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
WGSGENEDX HOLDINGS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 255,059 shares; 2024Q4: 187,618 shares; 2025Q1: 127,062 shares; 2025Q2: 127,062 shares; 2025Q3: 127,062 shares; 2025Q4: 127,062 shares 127,062$16.5M10.49%0Timeline
AMRCAMERESCO INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 205,948 shares; 2024Q4: 272,694 shares; 2025Q1: 472,798 shares; 2025Q2: 472,798 shares; 2025Q3: 472,798 shares; 2025Q4: 472,798 shares 472,798$13.8M8.79%0Timeline
ALAIR LEASE CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 196,479 shares; 2024Q4: 196,479 shares; 2025Q1: 196,479 shares; 2025Q2: 196,479 shares; 2025Q3: 196,479 shares; 2025Q4: 196,479 shares 196,479$12.6M8.01%0Timeline
EPDENTERPRISE PRODS PARTNERS LQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 339,877 shares; 2024Q4: 339,877 shares; 2025Q1: 339,877 shares; 2025Q2: 339,877 shares; 2025Q3: 339,877 shares; 2025Q4: 339,877 shares 339,877$10.9M6.92%0Timeline
CDNACAREDX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 412,875 shares; 2024Q4: 412,875 shares; 2025Q1: 412,875 shares; 2025Q2: 454,163 shares; 2025Q3: 529,414 shares; 2025Q4: 532,892 shares 532,892$10M6.37%+3,478Timeline
NVGSNAVIGATOR HLDGS LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 517,066 shares; 2024Q4: 517,066 shares; 2025Q1: 517,066 shares; 2025Q2: 517,066 shares; 2025Q3: 517,066 shares; 2025Q4: 517,066 shares 517,066$8.96M5.69%0Timeline
EQIXEQUINIX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 6,600 shares; 2024Q4: 6,600 shares; 2025Q1: 7,778 shares; 2025Q2: 10,715 shares; 2025Q3: 10,715 shares; 2025Q4: 10,715 shares 10,715$8.21M5.21%0Timeline
PROFPROFOUND MED CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 747,226 shares; 2024Q4: 896,671 shares; 2025Q1: 896,671 shares; 2025Q2: 896,671 shares; 2025Q3: 896,671 shares; 2025Q4: 962,186 shares 962,186$7.57M4.81%+65,515Timeline
BLBLACKLINE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 103,692 shares; 2024Q4: 103,692 shares; 2025Q1: 130,050 shares; 2025Q2: 130,050 shares; 2025Q3: 130,050 shares; 2025Q4: 130,050 shares 130,050$7.19M4.56%0Timeline
FRSHFRESHWORKS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 470,434 shares; 2024Q4: 470,434 shares; 2025Q1: 470,434 shares; 2025Q2: 470,434 shares; 2025Q3: 1,129,758 shares; 2025Q4: 564,879 shares 564,879$6.92M4.39%-564,879Timeline
PCRXPACIRA BIOSCIENCES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 133,390 shares; 2024Q4: 133,390 shares; 2025Q1: 133,390 shares; 2025Q2: 213,402 shares; 2025Q3: 213,402 shares; 2025Q4: 260,908 shares 260,908$6.75M4.29%+47,506Timeline
FIVNFIVE9 INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 167,386 shares; 2024Q4: 167,386 shares; 2025Q1: 167,386 shares; 2025Q2: 167,386 shares; 2025Q3: 167,386 shares; 2025Q4: 336,277 shares 336,277$6.74M4.28%+168,891Timeline
BLFSBIOLIFE SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 274,217 shares; 2024Q4: 274,217 shares; 2025Q1: 274,217 shares; 2025Q2: 274,217 shares; 2025Q3: 274,217 shares; 2025Q4: 274,217 shares 274,217$6.63M4.21%0Timeline
AMPLAMPLITUDE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 352,991 shares; 2025Q4: 457,212 shares 457,212$5.29M3.36%+104,221Timeline
DVDOUBLEVERIFY HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 135,410 shares; 2024Q4: 67,705 shares; 2025Q1: 67,705 shares; 2025Q2: 312,885 shares; 2025Q3: 625,770 shares; 2025Q4: 438,039 shares 438,039$5.01M3.18%-187,731Timeline
HZOMARINEMAX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 151,845 shares; 2025Q4: 194,484 shares 194,484$4.71M2.99%+42,639Timeline
VERXVERTEX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 115,594 shares; 2024Q4: 115,594 shares; 2025Q1: 161,813 shares; 2025Q2: 161,813 shares; 2025Q3: 232,479 shares; 2025Q4: 232,479 shares 232,479$4.64M2.95%0Timeline
TMCITREACE MED CONCEPTS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 489,891 shares; 2024Q4: 489,891 shares; 2025Q1: 489,891 shares; 2025Q2: 830,270 shares; 2025Q3: 968,464 shares; 2025Q4: 1,534,034 shares 1,534,034$3.76M2.39%+565,570Timeline
NVDANVIDIA CORPORATIONQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 16,555 shares; 2024Q4: 16,555 shares; 2025Q1: 16,555 shares; 2025Q2: 16,555 shares; 2025Q3: 16,555 shares; 2025Q4: 16,555 shares 16,555$3.09M1.96%0Timeline
OSURORASURE TECHNOLOGIES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 797,277 shares; 2025Q2: 1,207,440 shares; 2025Q3: 1,207,440 shares; 2025Q4: 1,207,440 shares 1,207,440$2.92M1.86%0Timeline
AOSLALPHA & OMEGA SEMICONDUCTORQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 120,196 shares; 2024Q4: 120,196 shares; 2025Q1: 120,196 shares; 2025Q2: 120,196 shares; 2025Q3: 120,196 shares; 2025Q4: 120,196 shares 120,196$2.38M1.51%0Timeline
KLTRKALTURA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,029,708 shares; 2024Q4: 1,386,044 shares; 2025Q1: 1,386,044 shares; 2025Q2: 1,386,044 shares; 2025Q3: 1,413,010 shares; 2025Q4: 1,413,010 shares 1,413,010$2.32M1.47%0Timeline
CNFCNFINANCE HLDGS LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 80,359 shares; 2025Q4: 80,359 shares 80,359$486K0.31%0Timeline

Sold out in Q4 2025

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
ASPNASPEN AEROGELS INC565,570$3.94Mshares

How Q4 2025 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001019056-26-000036 base2026-02-13acceptance time not in the bulk data set