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GAMCO Investors (Gabelli): ATI position timeline

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

GAMCO Investors (Gabelli) held 374,579 ATI 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 374,579 shares
    Change vs previous 13F -2,237 shares

    0.28% of the 13F portfolio, value $73,829,521.

    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: 358,000 shares
    • GABELLI FUNDS LLC: 16,579 shares

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

  2. period ended2026-03-31
    13F 376,816 shares
    Change vs previous 13F -19,980 shares

    0.22% of the 13F portfolio, value $54,811,655.

    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: 361,500 shares
    • GABELLI FUNDS LLC: 15,316 shares

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

  3. period ended2025-12-31
    13F 396,796 shares
    Change vs previous 13F -13,504 shares

    0.18% of the 13F portfolio, value $45,536,309.

    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: 383,100 shares
    • GABELLI FUNDS LLC: 13,696 shares

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

  4. period ended2025-09-30
    13F 410,300 shares
    Change vs previous 13F -5,000 shares

    0.13% of the 13F portfolio, value $33,373,802.

    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: 395,800 shares
    • GABELLI FUNDS LLC: 14,500 shares

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

  5. period ended2025-06-30
    13F 415,300 shares
    Change vs previous 13F -900 shares

    0.15% of the 13F portfolio, value $35,857,002.

    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: 400,800 shares
    • GABELLI FUNDS LLC: 14,500 shares

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

  6. period ended2025-03-31
    13F 416,200 shares
    Change vs previous 13F -4,000 shares

    0.1% of the 13F portfolio, value $21,654,886.

    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: 401,700 shares
    • GABELLI FUNDS LLC: 14,500 shares

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

  7. period ended2024-12-31
    13F 420,200 shares
    Change vs previous 13F +11,158 shares

    0.1% of the 13F portfolio, value $23,127,808.

    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: 405,700 shares
    • GABELLI FUNDS LLC: 14,500 shares

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

  8. period ended2024-09-30
    13F 409,042 shares
    Change vs previous 13F not available

    0.28% of the 13F portfolio, value $27,369,000.

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

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