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GAMCO Investors (Gabelli): GLW position timeline

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

GAMCO Investors (Gabelli) held 350,720 GLW 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 350,720 shares
    Change vs previous 13F -34,994 shares

    0.33% of the 13F portfolio, value $89,584,410.

    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: 156,156 shares
    • GABELLI FUNDS LLC: 194,564 shares

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

  2. period ended2026-03-31
    13F 385,714 shares
    Change vs previous 13F -94,579 shares

    0.21% of the 13F portfolio, value $52,445,533.

    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: 155,838 shares
    • GABELLI FUNDS LLC: 229,876 shares

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

  3. period ended2025-12-31
    13F 480,293 shares
    Change vs previous 13F -56,772 shares

    0.17% of the 13F portfolio, value $42,054,455.

    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: 192,594 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 0 shares
    • GABELLI FUNDS LLC: 287,699 shares

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

  4. period ended2025-09-30
    13F 537,065 shares
    Change vs previous 13F -31,138 shares

    0.17% of the 13F portfolio, value $44,055,442.

    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: 202,217 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 12,000 shares
    • GABELLI FUNDS LLC: 322,848 shares

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

  5. period ended2025-06-30
    13F 568,203 shares
    Change vs previous 13F -32,539 shares

    0.12% of the 13F portfolio, value $29,881,795.

    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: 221,155 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 15,200 shares
    • GABELLI FUNDS LLC: 331,848 shares

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

  6. period ended2025-03-31
    13F 600,742 shares
    Change vs previous 13F -157,568 shares

    0.12% of the 13F portfolio, value $27,501,969.

    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: 227,245 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 15,700 shares
    • GABELLI FUNDS LLC: 357,797 shares

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

  7. period ended2024-12-31
    13F 758,310 shares
    Change vs previous 13F -58,236 shares

    0.15% of the 13F portfolio, value $36,034,891.

    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: 256,710 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 16,300 shares
    • GABELLI FUNDS LLC: 485,300 shares

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

  8. period ended2024-09-30
    13F 816,546 shares
    Change vs previous 13F not available

    0.15% of the 13F portfolio, value $36,867,052.

    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: 266,146 shares
    • GABELLI & Co INVESTMENT ADVISERS, INC.: 16,700 shares
    • GABELLI FUNDS LLC: 533,700 shares

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