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Stephens Investment Management Group LLC: AMPX position timeline

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

Stephens Investment Management Group LLC held 738,693 AMPX shares at 2026-06-30 per its 13F-HR filed 2026-07-29.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 738,693 shares
    Change vs previous 13F -183,310 shares

    0.06% of the 13F portfolio, value $10,238,285.

    13F-HR 0001314440-26-000010 filed by Stephens Investment Management Group LLC
    Filed (acceptance time not in the bulk data set), ingested

    • STEPHENS INC /AR/: 24,369 shares
    • Stephens Investment Management Group LLC: 714,324 shares

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

  2. period ended2026-03-31
    13F 922,003 shares
    Change vs previous 13F -548,922 shares

    0.1% of the 13F portfolio, value $15,544,971.

    13F-HR 0001314440-26-000006 filed by Stephens Investment Management Group LLC
    Filed (acceptance time not in the bulk data set), ingested

    • STEPHENS INC /AR/: 28,895 shares
    • Stephens Investment Management Group LLC: 893,108 shares

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

  3. period ended2025-12-31
    13F 1,470,925 shares
    Change vs previous 13F +367,687 shares

    0.07% of the 13F portfolio, value $11,605,598.

    13F-HR 0001314440-26-000003 filed by Stephens Investment Management Group LLC
    Filed (acceptance time not in the bulk data set), ingested

    • STEPHENS INC /AR/: 29,227 shares
    • Stephens Investment Management Group LLC: 1,441,698 shares

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

  4. period ended2025-09-30
    13F 1,103,238 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $11,606,064.

    13F-HR 0001314440-25-000016 filed by Stephens Investment Management Group LLC
    Filed (acceptance time not in the bulk data set), ingested

    • STEPHENS INC /AR/: 20,331 shares
    • Stephens Investment Management Group LLC: 1,082,907 shares

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