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GAMCO Investors (Gabelli): AMBP position timeline

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

GAMCO Investors (Gabelli) held 2,485,076 AMBP 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 2,485,076 shares
    Change vs previous 13F +176,024 shares

    0.04% of the 13F portfolio, value $11,779,261.

    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: 1,450,228 shares
    • GABELLI FUNDS LLC: 1,034,848 shares

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

  2. period ended2026-03-31
    13F 2,309,052 shares
    Change vs previous 13F -50,641 shares

    0.04% of the 13F portfolio, value $9,351,660.

    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: 1,422,507 shares
    • GABELLI FUNDS LLC: 886,545 shares

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

  3. period ended2025-12-31
    13F 2,359,693 shares
    Change vs previous 13F -50,439 shares

    0.04% of the 13F portfolio, value $9,674,742.

    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: 1,452,836 shares
    • GABELLI FUNDS LLC: 906,857 shares

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

  4. period ended2025-09-30
    13F 2,410,132 shares
    Change vs previous 13F -109,501 shares

    0.04% of the 13F portfolio, value $9,616,427.

    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: 1,374,835 shares
    • GABELLI FUNDS LLC: 1,035,297 shares

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

  5. period ended2025-06-30
    13F 2,519,633 shares
    Change vs previous 13F +997,978 shares

    0.04% of the 13F portfolio, value $10,784,029.

    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: 1,476,861 shares
    • GABELLI FUNDS LLC: 1,042,772 shares

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

  6. period ended2025-03-31
    13F 1,521,655 shares
    Change vs previous 13F +68,222 shares

    0.02% of the 13F portfolio, value $4,595,398.

    13F-HR 0001140361-25-018975 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 1,384,608 shares
    • GABELLI FUNDS LLC: 137,047 shares

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

  7. period ended2024-12-31
    13F 1,453,433 shares
    Change vs previous 13F +96,500 shares

    0.02% of the 13F portfolio, value $4,374,833.

    13F-HR 0001140361-25-004330 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 1,314,433 shares
    • GABELLI FUNDS LLC: 139,000 shares

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

  8. period ended2024-09-30
    13F 1,356,933 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $5,115,637.

    13F-HR 0001140361-24-046738 filed by GAMCO INVESTORS, INC. ET AL
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 1,222,933 shares
    • GABELLI FUNDS LLC: 134,000 shares

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