SEC 13F Intelligence

William Blair Investment Management, LLC / MA

William Blair Investment Management, LLC’s Mastercard Incorporated Position

Does William Blair Investment Management, LLC own Mastercard Incorporated (MA)? Yes — 1.06M shares worth $530M (+1.75% of its 13F portfolio) as of Q1 2026, down from 1.08M shares the prior filed quarter.

Position Value
$530M
Q1 2026
Shares
1.06M
% of Portfolio
+1.75%
Quarters Held
30
currently held

Position History MA

Reported value by quarter
Q4 ’18: $108MQ4 ’18Q1 ’19: $136MQ2 ’19: $155MQ3 ’19: $145MQ4 ’19: $165MQ4 ’19Q1 ’20: $147MQ2 ’20: $227MQ3 ’20: $236MQ4 ’20: $220MQ4 ’20Q1 ’21: $269MQ2 ’21: $281MQ3 ’21: $284MQ4 ’21: $338MQ4 ’21Q1 ’22: $356MQ2 ’22: $387MQ3 ’22: $361MQ4 ’22: $426MQ4 ’22Q1 ’23: $455MQ2 ’23: $484MQ3 ’23: $507MQ4 ’23: $575MQ4 ’23Q1 ’24: $706MQ2 ’24: $662MQ3 ’24: $706MQ4 ’24: $756MQ4 ’24Q1 ’25: $666MQ2 ’25: $686MQ3 ’25: $629MQ4 ’25: $619MQ4 ’25Q1 ’26: $530Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 20261.06M$530M+1.75%
Q4 20251.08M$619M+1.73%
Q3 20251.11M$629M+1.63%
Q2 20251.22M$686M+1.82%
Q1 20251.22M$666M+1.87%
Q4 20241.44M$756M+1.85%
Q3 20241.43M$706M+1.74%
Q2 20241.50M$662M+1.74%
Q1 20241.47M$706M+1.83%
Q4 20231.35M$575M+1.67%
Q3 20231.28M$507M+1.69%
Q2 20231.23M$484M+1.55%
Q1 20231.25M$455M+1.59%
Q4 20221.22M$426M+1.63%
Q3 20221.27M$361M+1.43%
Q2 20221.23M$387M+1.43%
Q1 2022995.0K$356M+1.06%
Q4 2021940.0K$338M+0.91%
Q3 2021816.5K$284M+0.80%
Q2 2021771.0K$281M+0.88%
Q1 2021755.1K$269M+0.87%
Q4 2020617.5K$220M+0.73%
Q3 2020698.4K$236M+0.92%
Q2 2020768.6K$227M+0.93%
Q1 2020607.7K$147M+0.71%
Q4 2019551.4K$165M+0.66%
Q3 2019533.3K$145M+0.62%
Q2 2019587.3K$155M+0.65%
Q1 2019576.4K$136M+0.57%
Q4 2018570.4K$108M+0.53%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See William Blair Investment Management, LLC’s full portfolio or all institutional holders of MA.