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Disclosery

BCK Partners, Inc.: GLW position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BCK Partners, Inc. on GLW, newest first. How the timeline and the estimate are built.

BCK Partners, Inc. held 18,713 GLW shares at 2026-06-30 per its 13F-HR filed 2026-07-20.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 18,713 shares
    Change vs previous 13F -913 shares

    2.3% of the 13F portfolio, value $4,779,879.

    13F-HR 0002085853-26-000766 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  2. period ended2026-03-31
    13F 19,626 shares
    Change vs previous 13F -2,323 shares

    1.44% of the 13F portfolio, value $2,668,547.

    13F-HR 0002085853-26-000506 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2025-12-31
    13F 21,949 shares
    Change vs previous 13F -9,456 shares

    1.04% of the 13F portfolio, value $1,921,854.

    13F-HR 0002085853-26-000131 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-09-30
    13F 31,405 shares
    Change vs previous 13F +3,913 shares

    1.39% of the 13F portfolio, value $2,576,152.

    13F-HR 0002085853-25-000179 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2025-06-30
    13F 27,492 shares
    Change vs previous 13F +647 shares

    0.85% of the 13F portfolio, value $1,445,804.

    13F-HR 0001667731-25-001008 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2025-03-31
    13F 26,845 shares
    Change vs previous 13F -32,564 shares

    0.77% of the 13F portfolio, value $1,228,979.

    13F-HR 0001667731-25-000525 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-12-31
    13F 59,409 shares
    Change vs previous 13F -2,760 shares

    1.73% of the 13F portfolio, value $2,823,131.

    13F-HR 0001667731-25-000172 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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

  8. period ended2024-09-30
    13F 62,169 shares
    Change vs previous 13F not available

    1.34% of the 13F portfolio, value $2,806,945.

    13F-HR 0001845867-24-000004 filed by BCK Partners, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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