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GAMCO Investors (Gabelli): GKOS position timeline

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

GAMCO Investors (Gabelli) held 6,238 GKOS 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 6,238 shares
    Change vs previous 13F -26 shares

    <0.01% of the 13F portfolio, value $871,823.

    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: 3,238 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  2. period ended2026-03-31
    13F 6,264 shares
    Change vs previous 13F -437 shares

    <0.01% of the 13F portfolio, value $674,382.

    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: 3,264 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  3. period ended2025-12-31
    13F 6,701 shares
    Change vs previous 13F -4,399 shares

    <0.01% of the 13F portfolio, value $756,610.

    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: 3,701 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  4. period ended2025-09-30
    13F 11,100 shares
    Change vs previous 13F +99 shares

    <0.01% of the 13F portfolio, value $905,205.

    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: 8,100 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  5. period ended2025-06-30
    13F 11,001 shares
    Change vs previous 13F +773 shares

    <0.01% of the 13F portfolio, value $1,136,293.

    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: 8,001 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  6. period ended2025-03-31
    13F 10,228 shares
    Change vs previous 13F +2,019 shares

    <0.01% of the 13F portfolio, value $1,006,640.

    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: 7,228 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  7. period ended2024-12-31
    13F 8,209 shares
    Change vs previous 13F -61 shares

    0.01% of the 13F portfolio, value $1,230,857.

    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: 5,209 shares
    • GABELLI FUNDS LLC: 3,000 shares

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

  8. period ended2024-09-30
    13F 8,270 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $1,077,416.

    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: 5,270 shares
    • GABELLI FUNDS LLC: 3,000 shares

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