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GAMCO Investors (Gabelli): ROCK position timeline

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

GAMCO Investors (Gabelli) held 130,730 ROCK 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 130,730 shares
    Change vs previous 13F -9,145 shares

    0.02% of the 13F portfolio, value $5,895,924.

    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: 96,625 shares
    • GABELLI FUNDS LLC: 34,105 shares

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

  2. period ended2026-03-31
    13F 139,875 shares
    Change vs previous 13F +12,654 shares

    0.02% of the 13F portfolio, value $5,576,817.

    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: 105,795 shares
    • GABELLI FUNDS LLC: 34,080 shares

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

  3. period ended2025-12-31
    13F 127,221 shares
    Change vs previous 13F +8 shares

    0.02% of the 13F portfolio, value $6,289,806.

    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: 91,270 shares
    • GABELLI FUNDS LLC: 35,951 shares

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

  4. period ended2025-09-30
    13F 127,213 shares
    Change vs previous 13F -1,250 shares

    0.03% of the 13F portfolio, value $7,988,976.

    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: 91,470 shares
    • GABELLI FUNDS LLC: 35,743 shares

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

  5. period ended2025-06-30
    13F 128,463 shares
    Change vs previous 13F +2,234 shares

    0.03% of the 13F portfolio, value $7,579,317.

    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: 92,570 shares
    • GABELLI FUNDS LLC: 35,893 shares

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

  6. period ended2025-03-31
    13F 126,229 shares
    Change vs previous 13F +2,336 shares

    0.03% of the 13F portfolio, value $7,404,593.

    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: 89,920 shares
    • GABELLI FUNDS LLC: 36,309 shares

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

  7. period ended2024-12-31
    13F 123,893 shares
    Change vs previous 13F -1,620 shares

    0.03% of the 13F portfolio, value $7,297,298.

    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: 87,220 shares
    • GABELLI FUNDS LLC: 36,673 shares

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

  8. period ended2024-09-30
    13F 125,513 shares
    Change vs previous 13F not available

    0.04% of the 13F portfolio, value $8,777,124.

    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: 89,645 shares
    • GABELLI FUNDS LLC: 35,868 shares

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