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GAMCO Investors (Gabelli): MDU position timeline

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

GAMCO Investors (Gabelli) held 528,604 MDU 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 528,604 shares
    Change vs previous 13F -53,543 shares

    0.04% of the 13F portfolio, value $11,211,691.

    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: 180,346 shares
    • GABELLI FUNDS LLC: 348,258 shares

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

  2. period ended2026-03-31
    13F 582,147 shares
    Change vs previous 13F -23,115 shares

    0.05% of the 13F portfolio, value $12,062,086.

    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: 186,421 shares
    • GABELLI FUNDS LLC: 395,726 shares

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

  3. period ended2025-12-31
    13F 605,262 shares
    Change vs previous 13F -28,503 shares

    0.05% of the 13F portfolio, value $11,814,714.

    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: 188,002 shares
    • GABELLI FUNDS LLC: 417,260 shares

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

  4. period ended2025-09-30
    13F 633,765 shares
    Change vs previous 13F -10,945 shares

    0.05% of the 13F portfolio, value $11,287,355.

    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: 197,997 shares
    • GABELLI FUNDS LLC: 435,768 shares

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

  5. period ended2025-06-30
    13F 644,710 shares
    Change vs previous 13F +491,610 shares

    0.04% of the 13F portfolio, value $10,747,316.

    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: 210,043 shares
    • GABELLI FUNDS LLC: 434,667 shares

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

  6. period ended2025-03-31
    13F 153,100 shares
    Change vs previous 13F -400 shares

    0.01% of the 13F portfolio, value $2,588,921.

    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: 17,600 shares
    • GABELLI FUNDS LLC: 135,500 shares

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

  7. period ended2024-12-31
    13F 153,500 shares
    Change vs previous 13F -700 shares

    0.01% of the 13F portfolio, value $2,766,070.

    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: 18,000 shares
    • GABELLI FUNDS LLC: 135,500 shares

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

  8. period ended2024-09-30
    13F 154,200 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $4,226,622.

    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: 18,200 shares
    • GABELLI FUNDS LLC: 136,000 shares

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