Skip to content
Disclosery

GAGNON SECURITIES LLC: ASPN position timeline

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

GAGNON SECURITIES LLC held 1,535,812 ASPN 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 1,535,812 shares
    Change vs previous 13F -326,039 shares

    1.88% of the 13F portfolio, value $9,737,048.

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

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

  2. period ended2026-03-31
    13F 1,861,851 shares
    Change vs previous 13F +728,603 shares

    1.47% of the 13F portfolio, value $6,367,530.

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

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

  3. period ended2025-12-31
    13F 1,133,248 shares
    Change vs previous 13F -1,187,155 shares

    0.65% of the 13F portfolio, value $3,207,092.

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

    • GAGNON SECURITIES LLC: 1,133,248 shares
    • Gagnon Advisors, LLC: 0 shares

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

  4. period ended2025-09-30
    13F 2,320,403 shares
    Change vs previous 13F -144,275 shares

    2.45% of the 13F portfolio, value $16,150,005.

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

    • GAGNON SECURITIES LLC: 1,754,833 shares
    • Gagnon Advisors, LLC: 565,570 shares

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

  5. period ended2025-06-30
    13F 2,464,678 shares
    Change vs previous 13F not available

    2.28% of the 13F portfolio, value $14,590,893.

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

    • GAGNON SECURITIES LLC: 1,899,108 shares
    • Gagnon Advisors, LLC: 565,570 shares

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