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MARSHALL WACE, LLP: AMPH position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of MARSHALL WACE, LLP on AMPH, newest first. How the timeline and the estimate are built.

MARSHALL WACE, LLP held 1,066,322 AMPH shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 1,066,322 shares
    Change vs previous 13F +40,682 shares

    0.02% of the 13F portfolio, value $21,518,378.

    13F-HR 0001318757-26-000010 filed by MARSHALL WACE, LLP
    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 1,025,640 shares
    Change vs previous 13F -211,644 shares

    0.02% of the 13F portfolio, value $20,092,287.

    13F-HR 0001318757-26-000005 filed by MARSHALL WACE, LLP
    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 1,237,284 shares
    Change vs previous 13F +363,216 shares

    0.03% of the 13F portfolio, value $33,134,466.

    13F-HR 0001318757-26-000003 filed by MARSHALL WACE, LLP
    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 874,068 shares
    Change vs previous 13F +25,383 shares

    0.03% of the 13F portfolio, value $23,293,911.

    13F-HR 0001318757-25-000046 filed by MARSHALL WACE, LLP
    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 848,685 shares
    Change vs previous 13F -183,037 shares

    0.02% of the 13F portfolio, value $19,485,809.

    13F-HR 0001318757-25-000034 filed by MARSHALL WACE, LLP
    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 1,031,722 shares
    Change vs previous 13F +423,016 shares

    0.04% of the 13F portfolio, value $29,909,622.

    13F-HR 0001318757-25-000023 filed by MARSHALL WACE, LLP
    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 608,706 shares
    Change vs previous 13F +40,212 shares

    0.03% of the 13F portfolio, value $22,601,255.

    13F-HR 0002048047-25-000005 filed by MARSHALL WACE, LLP
    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 568,494 shares
    Change vs previous 13F not available

    0.04% of the 13F portfolio, value $27,589,013.

    13F-HR 0001318757-24-000018 filed by MARSHALL WACE, LLP
    Filed (acceptance time not in the bulk data set), ingested

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