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Disclosery

Optiver Holding B.V.: AMPH position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Optiver Holding B.V. on AMPH, newest first. How the timeline and the estimate are built.

Optiver Holding B.V. held 192 AMPH shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 192 shares
    Change vs previous 13F +164 shares

    <0.01% of the 13F portfolio, value $3,875.

    13F-HR 0001859606-26-000005 filed by Optiver Holding B.V.
    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/A 28 shares
    Change vs previous 13F -36 shares

    <0.01% of the 13F portfolio, value $549.

    13F-HR/A 0001859606-26-000004 filed by Optiver Holding B.V.
    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 64 shares
    Change vs previous 13F -82 shares

    <0.01% of the 13F portfolio, value $1,714.

    13F-HR 0001859606-26-000001 filed by Optiver Holding B.V.
    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 146 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $3,891.

    13F-HR 0001859606-25-000023 filed by Optiver Holding B.V.
    Filed (acceptance time not in the bulk data set), ingested

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