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BLAIR WILLIAM & CO/IL: OSW position timeline

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

BLAIR WILLIAM & CO/IL held 142,896 OSW 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 142,896 shares
    Change vs previous 13F -2,494 shares

    0.01% of the 13F portfolio, value $4,035,369.

    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 145,390 shares
    Change vs previous 13F -5,862 shares

    0.01% of the 13F portfolio, value $3,336,710.

    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 151,252 shares
    Change vs previous 13F -1,025 shares

    0.01% of the 13F portfolio, value $3,136,968.

    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 152,277 shares
    Change vs previous 13F +924 shares

    0.01% of the 13F portfolio, value $3,219,142.

    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 151,353 shares
    Change vs previous 13F -20,523 shares

    0.01% of the 13F portfolio, value $3,086,083.

    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 171,876 shares
    Change vs previous 13F -4,198 shares

    0.01% of the 13F portfolio, value $2,885,801.

    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 176,074 shares
    Change vs previous 13F +157,309 shares

    0.01% of the 13F portfolio, value $3,503,864.

    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 18,765 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $309,810.

    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).