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BLAIR WILLIAM & CO/IL: ARGX position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BLAIR WILLIAM & CO/IL on ARGX, newest first. How the timeline and the estimate are built.

BLAIR WILLIAM & CO/IL held 27,666 ARGX shares at 2026-06-30 per its 13F-HR filed 2026-08-11.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 27,666 shares
    Change vs previous 13F +5,259 shares

    0.07% of the 13F portfolio, value $25,667,221.

    13F-HR 0001104659-26-093821 filed by BLAIR WILLIAM & CO/IL
    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 22,407 shares
    Change vs previous 13F -3,933 shares

    0.05% of the 13F portfolio, value $16,362,347.

    13F-HR 0001104659-26-057897 filed by BLAIR WILLIAM & CO/IL
    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 26,340 shares
    Change vs previous 13F +23,957 shares

    0.06% of the 13F portfolio, value $22,150,766.

    13F-HR 0001104659-26-015563 filed by BLAIR WILLIAM & CO/IL
    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 2,383 shares
    Change vs previous 13F +73 shares

    <0.01% of the 13F portfolio, value $1,757,731.

    13F-HR 0001104659-25-109927 filed by BLAIR WILLIAM & CO/IL
    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 2,310 shares
    Change vs previous 13F +231 shares

    <0.01% of the 13F portfolio, value $1,273,318.

    13F-HR 0001104659-25-070274 filed by BLAIR WILLIAM & CO/IL
    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 2,079 shares
    Change vs previous 13F +1,165 shares

    <0.01% of the 13F portfolio, value $1,230,487.

    13F-HR 0001104659-25-046545 filed by BLAIR WILLIAM & CO/IL
    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 914 shares
    Change vs previous 13F -6 shares

    <0.01% of the 13F portfolio, value $562,110.

    13F-HR 0001104659-25-011872 filed by BLAIR WILLIAM & CO/IL
    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 920 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $498,714.

    13F-HR 0001104659-24-116499 filed by BLAIR WILLIAM & CO/IL
    Filed (acceptance time not in the bulk data set), ingested

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