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GAMCO Investors (Gabelli): ACI position timeline

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

GAMCO Investors (Gabelli) held 84,500 ACI 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 84,500 shares
    Change vs previous 13F 0 shares

    <0.01% of the 13F portfolio, value $1,143,285.

    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: 52,500 shares
    • GABELLI FUNDS LLC: 32,000 shares

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

  2. period ended2026-03-31
    13F 84,500 shares
    Change vs previous 13F -192,525 shares

    0.01% of the 13F portfolio, value $1,439,880.

    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: 52,500 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 0 shares
    • GABELLI FUNDS LLC: 32,000 shares

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

  3. period ended2025-12-31
    13F 277,025 shares
    Change vs previous 13F -109,850 shares

    0.02% of the 13F portfolio, value $4,756,519.

    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: 86,502 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 77,745 shares
    • GABELLI FUNDS LLC: 112,778 shares

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

  4. period ended2025-09-30
    13F 386,875 shares
    Change vs previous 13F -4,150 shares

    0.03% of the 13F portfolio, value $6,774,181.

    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: 95,102 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 138,495 shares
    • GABELLI FUNDS LLC: 153,278 shares

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

  5. period ended2025-06-30
    13F 391,025 shares
    Change vs previous 13F -288,423 shares

    0.03% of the 13F portfolio, value $8,410,947.

    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: 99,402 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 142,295 shares
    • GABELLI FUNDS LLC: 149,328 shares

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

  6. period ended2025-03-31
    13F 679,448 shares
    Change vs previous 13F -328,764 shares

    0.07% of the 13F portfolio, value $14,941,062.

    13F-HR 0001140361-25-018982 filed by GABELLI & Co INVESTMENT ADVISERS, INC.
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 44,200 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 327,605 shares
    • GABELLI FUNDS LLC: 307,643 shares

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

  7. period ended2024-12-31
    13F 1,008,212 shares
    Change vs previous 13F -539,641 shares

    0.08% of the 13F portfolio, value $19,801,284.

    13F-HR 0001140361-25-004332 filed by GABELLI & Co INVESTMENT ADVISERS, INC.
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 67,073 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 482,270 shares
    • GABELLI FUNDS LLC: 458,869 shares

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

  8. period ended2024-09-30
    13F 1,547,853 shares
    Change vs previous 13F not available

    0.12% of the 13F portfolio, value $28,604,323.

    13F-HR 0001140361-24-046504 filed by GABELLI & Co INVESTMENT ADVISERS, INC.
    Filed (acceptance time not in the bulk data set), ingested

    • GAMCO INVESTORS, INC. ET AL: 75,723 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 773,546 shares
    • GABELLI FUNDS LLC: 698,584 shares

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