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Disclosery

Barton Investment Management: GTLB position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Barton Investment Management on GTLB, newest first. How the timeline and the estimate are built.

Barton Investment Management held 480,456 GTLB 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 480,456 shares
    Change vs previous 13F -74,487 shares

    1.99% of the 13F portfolio, value $14,668,322.

    13F-HR 0001387818-26-000003 filed by Barton Investment Management
    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 554,943 shares
    Change vs previous 13F -3,660 shares

    1.51% of the 13F portfolio, value $12,008,967.

    13F-HR 0001387818-26-000002 filed by Barton Investment Management
    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 558,603 shares
    Change vs previous 13F +1,725 shares

    2.26% of the 13F portfolio, value $20,964,371.

    13F-HR 0001387818-26-000001 filed by Barton Investment Management
    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 556,878 shares
    Change vs previous 13F -7,305 shares

    2.56% of the 13F portfolio, value $25,104,061.

    13F-HR 0001387818-25-000005 filed by Barton Investment Management
    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 564,183 shares
    Change vs previous 13F +124,930 shares

    2.64% of the 13F portfolio, value $25,450,296.

    13F-HR 0001387818-25-000004 filed by Barton Investment Management
    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 439,253 shares
    Change vs previous 13F +103,605 shares

    2.54% of the 13F portfolio, value $20,644,891.

    13F-HR 0001387818-25-000002 filed by Barton Investment Management
    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 335,648 shares
    Change vs previous 13F +167,290 shares

    2.01% of the 13F portfolio, value $18,913,765.

    13F-HR 0001387818-25-000001 filed by Barton Investment Management
    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 168,358 shares
    Change vs previous 13F not available

    1.09% of the 13F portfolio, value $8,677,172.

    13F-HR 0001387818-24-000005 filed by Barton Investment Management
    Filed (acceptance time not in the bulk data set), ingested

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