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GAMCO Investors (Gabelli): MTRN position timeline

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

GAMCO Investors (Gabelli) held 182,940 MTRN 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 182,940 shares
    Change vs previous 13F -12,800 shares

    0.2% of the 13F portfolio, value $54,404,527.

    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: 180,940 shares
    • GABELLI FUNDS LLC: 2,000 shares

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

  2. period ended2026-03-31
    13F 195,740 shares
    Change vs previous 13F -4,710 shares

    0.11% of the 13F portfolio, value $28,313,791.

    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: 191,240 shares
    • GABELLI FUNDS LLC: 4,500 shares

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

  3. period ended2025-12-31
    13F 200,450 shares
    Change vs previous 13F +800 shares

    0.1% of the 13F portfolio, value $24,919,944.

    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: 195,950 shares
    • GABELLI FUNDS LLC: 4,500 shares

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

  4. period ended2025-09-30
    13F 199,650 shares
    Change vs previous 13F +8,000 shares

    0.1% of the 13F portfolio, value $24,119,717.

    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: 195,150 shares
    • GABELLI FUNDS LLC: 4,500 shares

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

  5. period ended2025-06-30
    13F 191,650 shares
    Change vs previous 13F -600 shares

    0.06% of the 13F portfolio, value $15,211,261.

    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: 187,150 shares
    • GABELLI FUNDS LLC: 4,500 shares

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

  6. period ended2025-03-31
    13F 192,250 shares
    Change vs previous 13F +1,500 shares

    0.07% of the 13F portfolio, value $15,687,600.

    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: 187,750 shares
    • GABELLI FUNDS LLC: 4,500 shares

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

  7. period ended2024-12-31
    13F 190,750 shares
    Change vs previous 13F -6,000 shares

    0.2% of the 13F portfolio, value $18,861,360.

    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: 190,750 shares
    • GABELLI FUNDS LLC: 0 shares

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

  8. period ended2024-09-30
    13F 196,750 shares
    Change vs previous 13F not available

    0.09% of the 13F portfolio, value $22,008,455.

    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: 194,250 shares
    • GABELLI FUNDS LLC: 2,500 shares

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