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CASTLEARK MANAGEMENT LLC: AMZN position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of CASTLEARK MANAGEMENT LLC on AMZN, newest first. How the timeline and the estimate are built.

CASTLEARK MANAGEMENT LLC held 268,249 AMZN shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 268,249 shares
    Change vs previous 13F +22,388 shares

    1.72% of the 13F portfolio, value $63,934,467.

    13F-HR 0001106832-26-000004 filed by CASTLEARK MANAGEMENT LLC
    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 245,861 shares
    Change vs previous 13F -226,288 shares

    1.69% of the 13F portfolio, value $51,205,470.

    13F-HR 0001106832-26-000003 filed by CASTLEARK MANAGEMENT LLC
    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 472,149 shares
    Change vs previous 13F +81,542 shares

    3.2% of the 13F portfolio, value $108,981,432.

    13F-HR 0001106832-26-000001 filed by CASTLEARK MANAGEMENT LLC
    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 390,607 shares
    Change vs previous 13F -208,000 shares

    2.4% of the 13F portfolio, value $85,765,579.

    13F-HR 0001106832-25-000008 filed by CASTLEARK MANAGEMENT LLC
    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 598,607 shares
    Change vs previous 13F +28,076 shares

    3.95% of the 13F portfolio, value $131,328,390.

    13F-HR 0001106832-25-000006 filed by CASTLEARK MANAGEMENT LLC
    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 570,531 shares
    Change vs previous 13F +10,336 shares

    3.76% of the 13F portfolio, value $108,549,228.

    13F-HR 0001106832-25-000004 filed by CASTLEARK MANAGEMENT LLC
    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 560,195 shares
    Change vs previous 13F +9,940 shares

    4.29% of the 13F portfolio, value $122,901,181.

    13F-HR 0001106832-25-000001 filed by CASTLEARK MANAGEMENT LLC
    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 550,255 shares
    Change vs previous 13F not available

    4.18% of the 13F portfolio, value $102,529,014.

    13F-HR 0001106832-24-000008 filed by CASTLEARK MANAGEMENT LLC
    Filed (acceptance time not in the bulk data set), ingested

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