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GAMCO Investors (Gabelli): AMT position timeline

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

GAMCO Investors (Gabelli) held 140,025 AMT 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 140,025 shares
    Change vs previous 13F +1,060 shares

    0.09% of the 13F portfolio, value $22,903,889.

    13F-HR 0001140361-26-032509 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 23,385 shares
    • GABELLI FUNDS LLC: 116,640 shares

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

  2. period ended2026-03-31
    13F 138,965 shares
    Change vs previous 13F +6,357 shares

    0.1% of the 13F portfolio, value $23,982,580.

    13F-HR 0001140361-26-021337 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 24,575 shares
    • GABELLI FUNDS LLC: 114,390 shares

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

  3. period ended2025-12-31
    13F 132,608 shares
    Change vs previous 13F +577 shares

    0.09% of the 13F portfolio, value $23,281,987.

    13F-HR 0001140361-26-003893 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 24,568 shares
    • GABELLI FUNDS LLC: 108,040 shares

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

  4. period ended2025-09-30
    13F 132,031 shares
    Change vs previous 13F +160 shares

    0.1% of the 13F portfolio, value $25,392,202.

    13F-HR 0001140361-25-041671 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 25,291 shares
    • GABELLI FUNDS LLC: 106,740 shares

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

  5. period ended2025-06-30
    13F 131,871 shares
    Change vs previous 13F -448 shares

    0.12% of the 13F portfolio, value $29,146,129.

    13F-HR 0001140361-25-030816 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 27,581 shares
    • GABELLI FUNDS LLC: 104,290 shares

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

  6. period ended2025-03-31
    13F 132,319 shares
    Change vs previous 13F -3,208 shares

    0.13% of the 13F portfolio, value $28,792,614.

    13F-HR 0001140361-25-018974 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 27,329 shares
    • GABELLI FUNDS LLC: 104,990 shares

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

  7. period ended2024-12-31
    13F 135,527 shares
    Change vs previous 13F -4,911 shares

    0.11% of the 13F portfolio, value $24,857,007.

    13F-HR 0001140361-25-004328 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 30,417 shares
    • GABELLI FUNDS LLC: 105,110 shares

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

  8. period ended2024-09-30
    13F 140,438 shares
    Change vs previous 13F not available

    0.14% of the 13F portfolio, value $32,660,261.

    13F-HR 0001140361-24-046503 filed by GABELLI FUNDS LLC
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 31,688 shares
    • GABELLI FUNDS LLC: 108,750 shares

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