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BLAIR WILLIAM & CO/IL: BY position timeline

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

BLAIR WILLIAM & CO/IL held 79,924 BY 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 79,924 shares
    Change vs previous 13F +3,938 shares

    0.01% of the 13F portfolio, value $3,009,936.

    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 75,986 shares
    Change vs previous 13F -6,953 shares

    0.01% of the 13F portfolio, value $2,398,878.

    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 82,939 shares
    Change vs previous 13F +3,815 shares

    0.01% of the 13F portfolio, value $2,417,676.

    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 79,124 shares
    Change vs previous 13F +71,401 shares

    0.01% of the 13F portfolio, value $2,194,115.

    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 7,723 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $206,449.

    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).