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GAMCO Investors (Gabelli): MASI position timeline

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

GAMCO Investors (Gabelli) held 0 MASI 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 0 shares
    Change vs previous 13F -306,732 shares

    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: 0 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 0 shares
    • GABELLI FUNDS LLC: 0 shares

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

    Exited: the 13F for this period no longer lists the position.

  2. period ended2026-03-31
    13F 306,732 shares
    Change vs previous 13F +191,032 shares

    0.21% of the 13F portfolio, value $54,558,421.

    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: 92,000 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 88,650 shares
    • GABELLI FUNDS LLC: 126,082 shares

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

  3. period ended2025-12-31
    13F 115,700 shares
    Change vs previous 13F -800 shares

    0.06% of the 13F portfolio, value $15,047,942.

    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: 83,000 shares
    • GABELLI FUNDS LLC: 32,700 shares

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

  4. period ended2025-09-30
    13F 116,500 shares
    Change vs previous 13F -700 shares

    0.07% of the 13F portfolio, value $17,189,575.

    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: 83,800 shares
    • GABELLI FUNDS LLC: 32,700 shares

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

  5. period ended2025-06-30
    13F 117,200 shares
    Change vs previous 13F -300 shares

    0.08% of the 13F portfolio, value $19,715,384.

    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: 84,500 shares
    • GABELLI FUNDS LLC: 32,700 shares

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

  6. period ended2025-03-31
    13F 117,500 shares
    Change vs previous 13F 0 shares

    0.09% of the 13F portfolio, value $19,575,500.

    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: 84,500 shares
    • GABELLI FUNDS LLC: 33,000 shares

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

  7. period ended2024-12-31
    13F 117,500 shares
    Change vs previous 13F 0 shares

    0.08% of the 13F portfolio, value $19,422,750.

    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: 84,500 shares
    • GABELLI FUNDS LLC: 33,000 shares

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

  8. period ended2024-09-30
    13F 117,500 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $15,666,275.

    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: 84,500 shares
    • GABELLI FUNDS LLC: 33,000 shares

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