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BlackRock, Inc.: AMPX position timeline

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

BlackRock, Inc. held 11,335,092 AMPX shares at 2026-06-30 per its 13F-HR filed 2026-08-07.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 11,335,092 shares
    Change vs previous 13F +2,109,481 shares

    <0.01% of the 13F portfolio, value $157,104,377.

    13F-HR 0002012383-26-003238 filed by BlackRock, 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 9,225,611 shares
    Change vs previous 13F +401,832 shares

    <0.01% of the 13F portfolio, value $155,543,800.

    13F-HR 0002012383-26-001841 filed by BlackRock, 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 8,823,779 shares
    Change vs previous 13F +1,368,076 shares

    <0.01% of the 13F portfolio, value $69,619,616.

    13F-HR 0002012383-26-000920 filed by BlackRock, 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 7,455,703 shares
    Change vs previous 13F +2,185,685 shares

    <0.01% of the 13F portfolio, value $78,433,995.

    13F-HR 0002012383-25-002949 filed by BlackRock, 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 5,270,018 shares
    Change vs previous 13F +4,195,966 shares

    <0.01% of the 13F portfolio, value $22,186,775.

    13F-HR 0001060021-25-000120 filed by BlackRock, 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 1,074,052 shares
    Change vs previous 13F +502,469 shares

    <0.01% of the 13F portfolio, value $2,878,458.

    13F-HR 0001576419-25-000869 filed by BlackRock, 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 571,583 shares
    Change vs previous 13F -120,946 shares

    <0.01% of the 13F portfolio, value $1,600,434.

    13F-HR 0001060021-25-000002 filed by BlackRock, 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 692,529 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $768,707.

    13F-HR 0001426459-24-000006 filed by BlackRock, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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