Gagnon Securities Llc

Business address
1370 Avenue Of The Americas, 26 Th Floor, 10019 New York, NY
State of incorporation
DE
Fiscal year end
December 31
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Gagnon Securities Llc has filed 250 SEC EDGAR filings since 2/22/2001

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
SCHEDULE 13G Open Document Open Filing Nov 17, 2025
SCHEDULE 13G/A Open Document Open Filing Nov 14, 2025
13F-HR Open Document Open Filing Nov 3, 2025 Sep 30, 2025 028-06377
SCHEDULE 13G/A Open Document Open Filing Oct 24, 2025
N-PX Open Document Open Filing Aug 5, 2025 Jun 30, 2025 028-06377
SCHEDULE 13G Open Document Open Filing Jul 24, 2025
13F-HR Open Document Open Filing Jul 23, 2025 Jun 30, 2025 028-06377
SCHEDULE 13G Open Document Open Filing May 15, 2025
13F-HR Open Document Open Filing May 9, 2025 Mar 31, 2025 028-06377
13F-HR Open Document Open Filing Jan 24, 2025 Dec 31, 2024 028-06377
SCHEDULE 13G/A Open Document Open Filing Jan 23, 2025
SCHEDULE 13G/A Open Document Open Filing Jan 23, 2025
SCHEDULE 13G/A Open Document Open Filing Jan 23, 2025
SC 13G/A Open Document Open Filing Nov 14, 2024
13F-HR Open Document Open Filing Nov 12, 2024 Sep 30, 2024 028-06377
N-PX Open Document Open Filing Aug 29, 2024 Jun 30, 2024 028-06377
SC 13G/A Open Document Open Filing Aug 21, 2024
13F-HR Open Document Open Filing Aug 14, 2024 Jun 30, 2024 028-06377
13F-HR Open Document Open Filing May 13, 2024 Mar 31, 2024 028-06377
13F-HR Open Document Open Filing Feb 14, 2024 Dec 31, 2023 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 13, 2024
SC 13G/A Open Document Open Filing SC 13G/A Feb 13, 2024
13F-HR Open Document Open Filing Nov 14, 2023 Sep 30, 2023 028-06377
13F-HR Open Document Open Filing Aug 8, 2023 Jun 30, 2023 028-06377
13F-HR Open Document Open Filing Apr 10, 2023 Mar 31, 2023 028-06377
SC 13G Open Document Open Filing SC 13G Mar 13, 2023
SC 13G/A Open Document Open Filing SC 13G/A Feb 13, 2023
13F-HR Open Document Open Filing Feb 7, 2023 Dec 31, 2022 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 6, 2023
13F-HR Open Document Open Filing Nov 14, 2022 Sep 30, 2022 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Oct 11, 2022
13F-HR Open Document Open Filing Aug 1, 2022 Jun 30, 2022 028-06377
13F-HR Open Document Open Filing May 9, 2022 Mar 31, 2022 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Mar 10, 2022
13F-HR Open Document Open Filing Feb 8, 2022 Dec 31, 2021 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 3, 2022
SC 13G/A Open Document Open Filing SC 13G/A Feb 3, 2022
13F-HR Open Document Open Filing Nov 12, 2021 Sep 30, 2021 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Sep 24, 2021
13F-HR Open Document Open Filing Jul 28, 2021 Jun 30, 2021 028-06377
13F-HR Open Document Open Filing May 14, 2021 Mar 31, 2021 028-06377
SC 13G/A Open Document Open Filing SC 13G/A May 11, 2021
SC 13G/A Open Document Open Filing SC 13G/A Apr 21, 2021
SC 13G Open Document Open Filing SCHEDULE 13G Apr 8, 2021
13F-HR Open Document Open Filing Feb 12, 2021 Dec 31, 2020 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 9, 2021
SC 13G/A Open Document Open Filing SC 13G/A Feb 9, 2021
13F-HR Open Document Open Filing Nov 12, 2020 Sep 30, 2020 028-06377
13F-HR Open Document Open Filing Aug 13, 2020 Jun 30, 2020 028-06377
13F-HR Open Document Open Filing May 11, 2020 Mar 31, 2020 028-06377
13F-HR Open Document Open Filing Feb 14, 2020 Dec 31, 2019 028-06377
SC 13G Open Document Open Filing SC 13G Feb 13, 2020
SC 13G/A Open Document Open Filing SC 13G/A Feb 13, 2020
13F-HR Open Document Open Filing Nov 8, 2019 Sep 30, 2019 028-06377
13F-HR Open Document Open Filing Aug 12, 2019 Jun 30, 2019 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Jun 20, 2019
13F-HR Open Document Open Filing May 13, 2019 Mar 31, 2019 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Jan 18, 2019
SC 13G/A Open Document Open Filing SC 13G/A Jan 18, 2019
SC 13G/A Open Document Open Filing SC 13G/A Jan 18, 2019
13F-HR Open Document Open Filing Jan 18, 2019 Dec 31, 2018 028-06377
13F-HR Open Document Open Filing Nov 13, 2018 Sep 30, 2018 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Nov 6, 2018
13F-HR Open Document Open Filing Aug 9, 2018 Jun 30, 2018 028-06377
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Jun 14, 2018
SC 13G Open Document Open Filing SCHEDULE 13G May 25, 2018
13F-HR Open Document Open Filing May 9, 2018 Mar 31, 2018 028-06377
13F-HR Open Document Open Filing Feb 13, 2018 Dec 31, 2017 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 13, 2018
SC 13G/A Open Document Open Filing SC 13G/A Feb 13, 2018
13F-HR/A Open Document Open Filing Nov 14, 2017 Sep 30, 2017 028-06377
13F-HR Open Document Open Filing Nov 14, 2017 Sep 30, 2017 028-06377
SC 13G Open Document Open Filing SC 13G Aug 10, 2017
13F-HR Open Document Open Filing Jul 20, 2017 Jun 30, 2017 028-06377
13F-HR Open Document Open Filing May 11, 2017 Mar 31, 2017 028-06377
13F-HR Open Document Open Filing Feb 14, 2017 Dec 31, 2016 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 14, 2017
SC 13G/A Open Document Open Filing SC 13G/A Feb 14, 2017
SC 13G Open Document Open Filing SCHEDULE 13G Jan 24, 2017
13F-HR Open Document Open Filing Nov 14, 2016 Sep 30, 2016 028-06377
13F-HR/A Open Document Open Filing Aug 24, 2016 Jun 30, 2016 028-06377
13F-HR Open Document Open Filing Aug 10, 2016 Jun 30, 2016 028-06377
13F-HR Open Document Open Filing May 3, 2016 Mar 31, 2016 028-06377
13F-HR Open Document Open Filing Feb 16, 2016 Dec 31, 2015 028-06377
SC 13G/A Open Document Open Filing SC 13G/A Feb 12, 2016
SC 13G/A Open Document Open Filing SC 13G/A Feb 12, 2016
SC 13G/A Open Document Open Filing SC 13G/A Feb 12, 2016
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 12, 2016
SC 13D/A Open Document Open Filing SC 13D/A Feb 3, 2016
SC 13D/A Open Document Open Filing SC 13D/A Oct 28, 2015
13F-HR Open Document Open Filing Oct 16, 2015 Sep 30, 2015 028-06377
SC 13G Open Document Open Filing SCHEDULE 13G Sep 23, 2015
SC 13G Open Document Open Filing SCHEDULE 13G Aug 12, 2015
13F-HR Open Document Open Filing Jul 24, 2015 Jun 30, 2015 028-06377
SC 13G/A Open Document Open Filing SCHEDULE 13G/A May 27, 2015
13F-HR Open Document Open Filing May 12, 2015 Mar 31, 2015 028-06377
SC 13G Open Document Open Filing SCHEDULE 13G Apr 7, 2015
13F-HR Open Document Open Filing Feb 13, 2015 Dec 31, 2014 028-06377
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 12, 2015
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 10, 2015
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 3, 2015
SC 13D/A Open Document Open Filing SCHEDULE 13D/A Dec 10, 2014
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Nov 7, 2014
13F-HR Open Document Open Filing Oct 15, 2014 Sep 30, 2014 028-06377
SC 13G Open Document Open Filing SCHEDULE 13G Sep 24, 2014
SC 13G Open Document Open Filing SCHEDULE 13G Sep 2, 2014
13F-HR Open Document Open Filing Jul 31, 2014 Jun 30, 2014 028-06377
SC 13G Open Document Open Filing SCHEDULE 13G Jul 29, 2014
SC 13D/A Open Document Open Filing SCHEDULE 13D/A Jun 26, 2014
SC 13D/A Open Document Open Filing SCHEDULE 13D/A Jun 12, 2014
SC 13D/A Open Document Open Filing SCHEDULE 13D/A May 15, 2014
13F-HR Open Document Open Filing May 6, 2014 Mar 31, 2014 028-06377
SC 13D/A Open Document Open Filing SCHEDULE 13D/A Apr 22, 2014
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Mar 18, 2014
SC 13D/A Open Document Open Filing SCHEDULE 13D/A Mar 5, 2014
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 7, 2014
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 6, 2014
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 6, 2014
SC 13G/A Open Document Open Filing SC 13G/A Feb 6, 2014
SC 13G/A Open Document Open Filing SC 13G/A Feb 6, 2014
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 6, 2014
13F-HR/A Open Document Open Filing Feb 6, 2014 Dec 31, 2013 028-06377
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 5, 2014
SC 13G Open Document Open Filing SCHEDULE 13G Feb 5, 2014
13F-HR Open Document Open Filing Jan 14, 2014 Dec 31, 2013 028-06377