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Disclosery

Columbia Asset Management: AMT position timeline

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

Columbia Asset Management held 8,047 AMT shares at 2026-06-30 per its 13F-HR filed 2026-07-21.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 8,047 shares
    Change vs previous 13F +315 shares

    0.23% of the 13F portfolio, value $1,316,248.

    13F-HR 0002085853-26-000792 filed by Columbia Asset 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 7,732 shares
    Change vs previous 13F +315 shares

    0.25% of the 13F portfolio, value $1,334,389.

    13F-HR 0002085853-26-000430 filed by Columbia Asset 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 7,417 shares
    Change vs previous 13F +126 shares

    0.23% of the 13F portfolio, value $1,302,203.

    13F-HR 0002085853-26-000122 filed by Columbia Asset 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 7,291 shares
    Change vs previous 13F +145 shares

    0.26% of the 13F portfolio, value $1,402,205.

    13F-HR 0002085853-25-000221 filed by Columbia Asset 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 7,146 shares
    Change vs previous 13F +165 shares

    0.31% of the 13F portfolio, value $1,579,409.

    13F-HR 0001667731-25-000872 filed by Columbia Asset 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 6,981 shares
    Change vs previous 13F -40 shares

    0.31% of the 13F portfolio, value $1,519,066.

    13F-HR 0001667731-25-000412 filed by Columbia Asset 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 7,021 shares
    Change vs previous 13F -34 shares

    0.25% of the 13F portfolio, value $1,287,722.

    13F-HR 0001667731-25-000251 filed by Columbia Asset 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 7,055 shares
    Change vs previous 13F not available

    0.29% of the 13F portfolio, value $1,641,000.

    13F-HR 0001585047-24-000004 filed by Columbia Asset Management
    Filed (acceptance time not in the bulk data set), ingested

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