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Gagnon Advisors, LLC

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13F filer, CIK 1599466, New York, NY

Gagnon Advisors, LLC reported $135,928,828 across 22 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-04-22. Its ten largest share positions make up 69.66% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001019056-26-000079

Period
2026-03-31
Reported value
$136M
Holdings
22
Top 10 weight
69.66%
New
2
Sold out
3

Part of the filer group GAGNON SECURITIES LLC

How groups are built

Largest buys vs the previous quarter

SecurityShares changeApprox. value
SGOVnew+95,621$9.63M
HNGEnew+80,787$3.12M
PCRXadded+91,729$2.07M
FRSHadded+211,333$1.7M
WGSadded+21,163$1.36M

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
ALexited-196,479-$12.6M
TMCIexited-1,534,034-$3.76M
NVDAexited-16,555-$3.09M
HZOreduced-97,242-$2.63M

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, Q1 2026

Share positions as resolved from 13F-HR 0001019056-26-000079, largest first. % of portfolio is the value over $135,928,828, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
EPDENTERPRISE PRODS PARTNERS LQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 339,877 shares 339,877$12.9M9.46%0Timeline
AMRCAMERESCO INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 472,798 shares 472,798$12.1M8.87%0Timeline
EQIXEQUINIX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 10,715 shares 10,715$10.5M7.73%0Timeline
NVGSNAVIGATOR HLDGS LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 539,881 shares 539,881$10.4M7.68%+22,815Timeline
SGOVISHARES TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 95,621 shares 95,621$9.63M7.08%newTimeline
WGSGENEDX HOLDINGS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 148,225 shares 148,225$9.52M7%+21,163Timeline
CDNACAREDX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 532,892 shares 532,892$9.25M6.81%0Timeline
PCRXPACIRA BIOSCIENCES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 352,637 shares 352,637$7.97M5.86%+91,729Timeline
PROFPROFOUND MED CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 962,186 shares 962,186$6.23M4.59%0Timeline
FRSHFRESHWORKS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 776,212 shares 776,212$6.23M4.59%+211,333Timeline
BLFSBIOLIFE SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 274,217 shares 274,217$5.23M3.85%0Timeline
FIVNFIVE9 INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 336,277 shares 336,277$5.1M3.75%0Timeline
BLBLACKLINE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 130,050 shares 130,050$4.81M3.54%0Timeline
AMPLAMPLITUDE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 352,991 shares; 2025Q4: 457,212 shares; 2026Q1: 634,987 shares 634,987$4.33M3.19%+177,775Timeline
DVDOUBLEVERIFY HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 438,039 shares 438,039$4.16M3.06%0Timeline
OSURORASURE TECHNOLOGIES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 1,207,440 shares 1,207,440$3.62M2.66%0Timeline
VERXVERTEX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 297,050 shares 297,050$3.53M2.6%+64,571Timeline
HNGEHINGE HEALTH INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 80,787 shares 80,787$3.12M2.29%newTimeline
AOSLALPHA & OMEGA SEMICONDUCTORQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 120,196 shares 120,196$2.66M1.96%0Timeline
HZOMARINEMAX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 151,845 shares; 2025Q4: 194,484 shares; 2026Q1: 97,242 shares 97,242$2.63M1.94%-97,242Timeline
KLTRKALTURA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 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; 2026Q1: 1,413,010 shares 1,413,010$1.72M1.27%0Timeline
CNFCNFINANCE HLDGS LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 80,359 shares; 2025Q4: 80,359 shares; 2026Q1: 80,359 shares 80,359$314K0.23%0Timeline

Sold out in Q1 2026

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

SecurityShares beforeValue beforeType
ALAIR LEASE CORP196,479$12.6Mshares
TMCITREACE MED CONCEPTS INC1,534,034$3.76Mshares
NVDANVIDIA CORPORATION16,555$3.09Mshares

How Q1 2026 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 0001019056-26-000079 base2026-04-22acceptance time not in the bulk data set