SEC 13F Intelligence

William Blair Investment Management, LLC / MLI

William Blair Investment Management, LLC’s Mueller Inds Inc Position

Does William Blair Investment Management, LLC own Mueller Inds Inc (MLI)? Yes — 2.11M shares worth $234M (+0.77% of its 13F portfolio) as of Q1 2026, up from 1.78M shares the prior filed quarter.

Position Value
$234M
Q1 2026
Shares
2.11M
% of Portfolio
+0.77%
Quarters Held
6
currently held

Position History MLI

Reported value by quarter
Q4 ’24: $201MQ4 ’24Q1 ’25: $179MQ1 ’25Q2 ’25: $184MQ2 ’25Q3 ’25: $202MQ3 ’25Q4 ’25: $204MQ4 ’25Q1 ’26: $234MQ1 ’26filingsflow.com
QuarterSharesValue% of Portfolio
Q1 20262.11M$234M+0.77%
Q4 20251.78M$204M+0.57%
Q3 20251.99M$202M+0.52%
Q2 20252.32M$184M+0.49%
Q1 20252.36M$179M+0.50%
Q4 20242.54M$201M+0.49%

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 MLI.