Golden Door Asset
Census

Generalist · Chicago, IL

William Blair Investment Management

Q4 2025 · compared with Q3 2025

Filed as William Blair Investment Management, LLC

Software
$5.4B
Weight of 13F
15.1%
Names
37
Net bought
+$1.6B

Filed 9 February 2026 · SEC filing.

412 positions in the whole 13F.

Quarters on file

Each quarter on file, back to June 2016 when the filing exists. Net bought is the share change from the previous quarter at that quarter’s close. A split that leaves the dollar value in place counts as flat.

What moved the book

The five software lines with the largest share change this quarter.

Software held