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BLAIR WILLIAM & CO/IL: BLK position timeline

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

BLAIR WILLIAM & CO/IL held 59,013 BLK 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 59,013 shares
    Change vs previous 13F -275 shares

    0.15% of the 13F portfolio, value $56,745,019.

    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 59,288 shares
    Change vs previous 13F -7,312 shares

    0.16% of the 13F portfolio, value $57,017,743.

    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 66,600 shares
    Change vs previous 13F -3,410 shares

    0.19% of the 13F portfolio, value $71,284,109.

    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 70,010 shares
    Change vs previous 13F +528 shares

    0.22% of the 13F portfolio, value $81,622,946.

    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 69,482 shares
    Change vs previous 13F +3,674 shares

    0.2% of the 13F portfolio, value $72,904,124.

    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 65,808 shares
    Change vs previous 13F +13,185 shares

    0.19% of the 13F portfolio, value $62,285,610.

    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 52,623 shares
    Change vs previous 13F not available

    0.16% of the 13F portfolio, value $53,944,543.

    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).