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Disclosery

GAGNON SECURITIES LLC: ATNM position timeline

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

GAGNON SECURITIES LLC held 182,142 ATNM 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 182,142 shares
    Change vs previous 13F -19,158 shares

    0.03% of the 13F portfolio, value $178,499.

    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 201,300 shares
    Change vs previous 13F -507 shares

    0.05% of the 13F portfolio, value $200,354.

    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 201,807 shares
    Change vs previous 13F -24,450 shares

    0.06% of the 13F portfolio, value $274,458.

    13F-HR 0001019056-26-000037 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).

  4. period ended2025-09-30
    13F 226,257 shares
    Change vs previous 13F -365 shares

    0.07% of the 13F portfolio, value $362,011.

    13F-HR 0001019056-25-000228 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).

  5. period ended2025-06-30
    13F 226,622 shares
    Change vs previous 13F 0 shares

    0.06% of the 13F portfolio, value $317,271.

    13F-HR 0001019056-25-000196 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).

  6. period ended2025-03-31
    13F 226,622 shares
    Change vs previous 13F not available

    0.08% of the 13F portfolio, value $364,861.

    13F-HR 0001019056-25-000173 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).