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GAMCO Investors (Gabelli): MTX position timeline

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

GAMCO Investors (Gabelli) held 352,430 MTX 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 352,430 shares
    Change vs previous 13F +715 shares

    0.1% of the 13F portfolio, value $26,069,247.

    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: 254,500 shares
    • GABELLI FUNDS LLC: 97,930 shares

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

  2. period ended2026-03-31
    13F 351,715 shares
    Change vs previous 13F -17,550 shares

    0.1% of the 13F portfolio, value $24,943,628.

    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: 254,500 shares
    • GABELLI FUNDS LLC: 97,215 shares

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

  3. period ended2025-12-31
    13F 369,265 shares
    Change vs previous 13F -302 shares

    0.09% of the 13F portfolio, value $22,506,701.

    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: 276,114 shares
    • GABELLI FUNDS LLC: 93,151 shares

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

  4. period ended2025-09-30
    13F 369,567 shares
    Change vs previous 13F -2,495 shares

    0.09% of the 13F portfolio, value $22,957,502.

    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: 277,916 shares
    • GABELLI FUNDS LLC: 91,651 shares

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

  5. period ended2025-06-30
    13F 372,062 shares
    Change vs previous 13F +48,962 shares

    0.08% of the 13F portfolio, value $20,489,455.

    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: 282,111 shares
    • GABELLI FUNDS LLC: 89,951 shares

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

  6. period ended2025-03-31
    13F 323,100 shares
    Change vs previous 13F +1,800 shares

    0.09% of the 13F portfolio, value $20,539,467.

    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: 240,100 shares
    • GABELLI FUNDS LLC: 83,000 shares

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

  7. period ended2024-12-31
    13F 321,300 shares
    Change vs previous 13F -2,200 shares

    0.11% of the 13F portfolio, value $24,486,273.

    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: 238,300 shares
    • GABELLI FUNDS LLC: 83,000 shares

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

  8. period ended2024-09-30
    13F 323,500 shares
    Change vs previous 13F not available

    0.11% of the 13F portfolio, value $24,983,905.

    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: 240,500 shares
    • GABELLI FUNDS LLC: 83,000 shares

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