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GAMCO Investors (Gabelli): MSM position timeline

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

GAMCO Investors (Gabelli) held 27,600 MSM 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 27,600 shares
    Change vs previous 13F 0 shares

    0.01% of the 13F portfolio, value $3,283,020.

    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: 15,300 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  2. period ended2026-03-31
    13F 27,600 shares
    Change vs previous 13F -3,500 shares

    0.01% of the 13F portfolio, value $2,546,652.

    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: 15,300 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  3. period ended2025-12-31
    13F 31,100 shares
    Change vs previous 13F 0 shares

    0.01% of the 13F portfolio, value $2,615,510.

    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: 18,800 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  4. period ended2025-09-30
    13F 31,100 shares
    Change vs previous 13F -200 shares

    0.01% of the 13F portfolio, value $2,865,554.

    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: 18,800 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  5. period ended2025-06-30
    13F 31,300 shares
    Change vs previous 13F -1,023 shares

    0.01% of the 13F portfolio, value $2,661,126.

    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: 19,000 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  6. period ended2025-03-31
    13F 32,323 shares
    Change vs previous 13F +23 shares

    0.01% of the 13F portfolio, value $2,510,527.

    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: 20,023 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  7. period ended2024-12-31
    13F 32,300 shares
    Change vs previous 13F -3,600 shares

    0.01% of the 13F portfolio, value $2,412,487.

    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: 20,000 shares
    • GABELLI FUNDS LLC: 12,300 shares

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

  8. period ended2024-09-30
    13F 35,900 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $3,089,554.

    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: 20,000 shares
    • GABELLI FUNDS LLC: 15,900 shares

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