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GAGNON SECURITIES LLC: BLFS position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GAGNON SECURITIES LLC on BLFS, newest first. How the timeline and the estimate are built.

GAGNON SECURITIES LLC held 810,123 BLFS shares at 2026-06-30 per its 13F-HR filed 2026-08-05.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 810,123 shares
    Change vs previous 13F -606 shares

    3.38% of the 13F portfolio, value $22,877,873.

    13F-HR 0001019056-26-000123 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 535,906 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  2. period ended2026-03-31
    13F 810,729 shares
    Change vs previous 13F +2,155 shares

    2.72% of the 13F portfolio, value $15,468,709.

    13F-HR 0001019056-26-000076 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 536,512 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  3. period ended2025-12-31
    13F 808,574 shares
    Change vs previous 13F -1,400 shares

    3.01% of the 13F portfolio, value $19,551,319.

    13F-HR 0001019056-26-000037 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 534,357 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  4. period ended2025-09-30
    13F 809,974 shares
    Change vs previous 13F -4,139 shares

    3.13% of the 13F portfolio, value $20,662,437.

    13F-HR 0001019056-25-000228 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 535,757 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  5. period ended2025-06-30
    13F 814,113 shares
    Change vs previous 13F -1,056 shares

    2.73% of the 13F portfolio, value $17,535,994.

    13F-HR 0001019056-25-000196 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 539,896 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  6. period ended2025-03-31
    13F 815,169 shares
    Change vs previous 13F -26,263 shares

    3.12% of the 13F portfolio, value $18,618,460.

    13F-HR 0001019056-25-000173 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 540,952 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  7. period ended2024-12-31
    13F 841,432 shares
    Change vs previous 13F -2,163 shares

    3.35% of the 13F portfolio, value $21,843,574.

    13F-HR 0001019056-25-000034 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 567,215 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).

  8. period ended2024-09-30
    13F 843,595 shares
    Change vs previous 13F not available

    3.2% of the 13F portfolio, value $21,123,619.

    13F-HR 0001019056-24-000316 filed by GAGNON SECURITIES LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAGNON SECURITIES LLC: 569,378 shares
    • Gagnon Advisors, LLC: 274,217 shares

    Acceptance time not in the bulk data set (spec §4.2).