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BLAIR WILLIAM & CO/IL: COST position timeline

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

BLAIR WILLIAM & CO/IL held 524,692 COST 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 524,692 shares
    Change vs previous 13F +3,415 shares

    1.28% of the 13F portfolio, value $490,833,719.

    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 521,277 shares
    Change vs previous 13F +95 shares

    1.49% of the 13F portfolio, value $519,416,520.

    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 521,182 shares
    Change vs previous 13F -30,376 shares

    1.21% of the 13F portfolio, value $449,436,279.

    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 551,558 shares
    Change vs previous 13F -428 shares

    1.36% of the 13F portfolio, value $510,538,965.

    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 551,986 shares
    Change vs previous 13F +3,087 shares

    1.52% of the 13F portfolio, value $546,433,309.

    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 548,899 shares
    Change vs previous 13F -39,157 shares

    1.57% of the 13F portfolio, value $519,137,354.

    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 588,056 shares
    Change vs previous 13F -402 shares

    1.57% of the 13F portfolio, value $538,818,003.

    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 588,458 shares
    Change vs previous 13F not available

    1.53% of the 13F portfolio, value $521,680,007.

    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).