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GAMCO Investors (Gabelli): M position timeline

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

GAMCO Investors (Gabelli) held 136,800 M 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 136,800 shares
    Change vs previous 13F 0 shares

    0.01% of the 13F portfolio, value $3,221,640.

    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: 12,500 shares
    • GABELLI FUNDS LLC: 124,300 shares

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

  2. period ended2026-03-31
    13F 136,800 shares
    Change vs previous 13F -200 shares

    0.01% of the 13F portfolio, value $2,474,712.

    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: 12,500 shares
    • GABELLI FUNDS LLC: 124,300 shares

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

  3. period ended2025-12-31
    13F 137,000 shares
    Change vs previous 13F 0 shares

    0.01% of the 13F portfolio, value $3,020,850.

    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: 12,500 shares
    • GABELLI FUNDS LLC: 124,500 shares

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

  4. period ended2025-09-30
    13F 137,000 shares
    Change vs previous 13F -1,000 shares

    0.01% of the 13F portfolio, value $2,456,410.

    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: 12,500 shares
    • GABELLI FUNDS LLC: 124,500 shares

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

  5. period ended2025-06-30
    13F 138,000 shares
    Change vs previous 13F -2,500 shares

    0.01% of the 13F portfolio, value $1,609,080.

    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: 13,500 shares
    • GABELLI FUNDS LLC: 124,500 shares

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

  6. period ended2025-03-31
    13F 140,500 shares
    Change vs previous 13F -38,100 shares

    0.01% of the 13F portfolio, value $1,764,680.

    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: 16,500 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 0 shares
    • GABELLI FUNDS LLC: 124,000 shares

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

  7. period ended2024-12-31
    13F 178,600 shares
    Change vs previous 13F -111,100 shares

    0.01% of the 13F portfolio, value $3,023,698.

    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: 14,200 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 14,600 shares
    • GABELLI FUNDS LLC: 149,800 shares

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

  8. period ended2024-09-30
    13F 289,700 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $4,545,394.

    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: 17,050 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 77,450 shares
    • GABELLI FUNDS LLC: 195,200 shares

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