BLAIR WILLIAM & CO/IL: MA position timeline
Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BLAIR WILLIAM & CO/IL on MA, newest first. How the timeline and the estimate are built.
BLAIR WILLIAM & CO/IL held 842,350 MA shares at 2026-06-30 per its 13F-HR filed 2026-08-11.
the latest 13F is the newest step
- period ended2026-06-3013F 842,350 sharesChange vs previous 13F -81,055 shares
1.13% of the 13F portfolio, value $432,630,792.
13F-HR 0001104659-26-093821 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2026-03-3113F 923,405 sharesChange vs previous 13F -31,783 shares
1.32% of the 13F portfolio, value $461,388,665.
13F-HR 0001104659-26-057897 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2025-12-3113F 955,188 sharesChange vs previous 13F -21,409 shares
1.46% of the 13F portfolio, value $545,297,918.
13F-HR 0001104659-26-015563 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2025-09-3013F 976,597 sharesChange vs previous 13F -30,726 shares
1.48% of the 13F portfolio, value $555,497,975.
13F-HR 0001104659-25-109927 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2025-06-3013F 1,007,323 sharesChange vs previous 13F -13,372 shares
1.57% of the 13F portfolio, value $566,054,989.
13F-HR 0001104659-25-070274 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2025-03-3113F 1,020,695 sharesChange vs previous 13F -18,996 shares
1.69% of the 13F portfolio, value $559,463,516.
13F-HR 0001104659-25-046545 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2024-12-3113F 1,039,691 sharesChange vs previous 13F -1,458 shares
1.59% of the 13F portfolio, value $547,469,969.
13F-HR 0001104659-25-011872 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).
- period ended2024-09-3013F 1,041,149 sharesChange vs previous 13F not available
1.51% of the 13F portfolio, value $514,119,344.
13F-HR 0001104659-24-116499 filed by BLAIR WILLIAM & CO/IL
Filed (acceptance time not in the bulk data set), ingestedAcceptance time not in the bulk data set (spec §4.2).