Skip to content
Disclosery

BLAIR WILLIAM & CO/IL: MAS position timeline

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

BLAIR WILLIAM & CO/IL held 9,291 MAS 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 9,291 shares
    Change vs previous 13F +1,437 shares

    <0.01% of the 13F portfolio, value $756,002.

    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 7,854 shares
    Change vs previous 13F +1,521 shares

    <0.01% of the 13F portfolio, value $474,148.

    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 6,333 shares
    Change vs previous 13F -366 shares

    <0.01% of the 13F portfolio, value $401,887.

    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 6,699 shares
    Change vs previous 13F -1,510 shares

    <0.01% of the 13F portfolio, value $471,524.

    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 8,209 shares
    Change vs previous 13F +1,057 shares

    <0.01% of the 13F portfolio, value $528,306.

    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 7,152 shares
    Change vs previous 13F -3,754 shares

    <0.01% of the 13F portfolio, value $497,383.

    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 10,906 shares
    Change vs previous 13F +1,174 shares

    <0.01% of the 13F portfolio, value $791,437.

    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 9,732 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $816,924.

    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).