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BLAIR WILLIAM & CO/IL: ARM position timeline

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

BLAIR WILLIAM & CO/IL held 20,050 ARM 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 20,050 shares
    Change vs previous 13F +4,003 shares

    0.02% of the 13F portfolio, value $7,109,129.

    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 16,047 shares
    Change vs previous 13F +3,051 shares

    0.01% of the 13F portfolio, value $2,427,590.

    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 12,996 shares
    Change vs previous 13F -875 shares

    <0.01% of the 13F portfolio, value $1,420,593.

    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 13,871 shares
    Change vs previous 13F -3,446 shares

    0.01% of the 13F portfolio, value $1,962,608.

    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 17,317 shares
    Change vs previous 13F -71,119 shares

    0.01% of the 13F portfolio, value $2,800,852.

    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 88,436 shares
    Change vs previous 13F +11,056 shares

    0.03% of the 13F portfolio, value $9,444,080.

    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 77,380 shares
    Change vs previous 13F +28,217 shares

    0.03% of the 13F portfolio, value $9,545,597.

    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 49,163 shares
    Change vs previous 13F not available

    0.02% of the 13F portfolio, value $7,030,801.

    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).