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GAMCO Investors (Gabelli): AMTM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GAMCO Investors (Gabelli) on AMTM, newest first. How the timeline and the estimate are built.

GAMCO Investors (Gabelli) held 173,403 AMTM shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 173,403 shares
    Change vs previous 13F +8,289 shares

    0.01% of the 13F portfolio, value $3,584,240.

    13F-HR 0001140361-26-032508 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 97,120 shares
    • GABELLI FUNDS LLC: 76,283 shares

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

  2. period ended2026-03-31
    13F 165,114 shares
    Change vs previous 13F +51,865 shares

    0.02% of the 13F portfolio, value $4,306,173.

    13F-HR 0001140361-26-021334 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 95,331 shares
    • GABELLI FUNDS LLC: 69,783 shares

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

  3. period ended2025-12-31
    13F 113,249 shares
    Change vs previous 13F -8,682 shares

    0.01% of the 13F portfolio, value $3,284,221.

    13F-HR 0001140361-26-003895 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 91,861 shares
    • GABELLI FUNDS LLC: 21,388 shares

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

  4. period ended2025-09-30
    13F 121,931 shares
    Change vs previous 13F -11,792 shares

    0.01% of the 13F portfolio, value $2,920,248.

    13F-HR 0001140361-25-041670 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 99,643 shares
    • GABELLI FUNDS LLC: 22,288 shares

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

  5. period ended2025-06-30
    13F 133,723 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $3,157,200.

    13F-HR 0001140361-25-030814 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 108,670 shares
    • GABELLI FUNDS LLC: 25,053 shares

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