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BLAIR WILLIAM & CO/IL: IONS position timeline

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

BLAIR WILLIAM & CO/IL held 31,606 IONS 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 31,606 shares
    Change vs previous 13F -2,251 shares

    0.01% of the 13F portfolio, value $2,506,078.

    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 33,857 shares
    Change vs previous 13F +69 shares

    0.01% of the 13F portfolio, value $2,542,358.

    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 33,788 shares
    Change vs previous 13F -583 shares

    0.01% of the 13F portfolio, value $2,673,007.

    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 34,371 shares
    Change vs previous 13F -3,520 shares

    0.01% of the 13F portfolio, value $2,248,582.

    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 37,891 shares
    Change vs previous 13F -490 shares

    <0.01% of the 13F portfolio, value $1,497,092.

    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 38,381 shares
    Change vs previous 13F -1,501 shares

    <0.01% of the 13F portfolio, value $1,157,969.

    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 39,882 shares
    Change vs previous 13F -6,769 shares

    <0.01% of the 13F portfolio, value $1,394,275.

    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 46,651 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $1,868,839.

    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).