SEC 13F Intelligence

William Blair Investment Management, LLC / WEA

William Blair Investment Management, LLC’s Western Alliance Bancorp Position

Does William Blair Investment Management, LLC own Western Alliance Bancorp (WEA)? Not currently — the last reported position was 1.71M shares worth $144M in Q4 2025; the fund’s latest 13F (Q1 2026) no longer reports it.

Position Value
$144M
Q4 2025
Shares
1.71M
% of Portfolio
+0.40%
Quarters Held
29
position exited

Position History WEA

Reported value by quarter
Q4 ’18: $21MQ4 ’18Q1 ’19: $21MQ2 ’19: $21MQ3 ’19: $22MQ4 ’19: $23MQ4 ’19Q1 ’20: $24MQ2 ’20: $28MQ3 ’20: $25MQ4 ’20: $151MQ4 ’20Q1 ’21: $223MQ2 ’21: $207MQ3 ’21: $236MQ4 ’21: $266MQ4 ’21Q1 ’22: $230MQ2 ’22: $190MQ3 ’22: $178MQ4 ’22: $154MQ4 ’22Q1 ’23: $65MQ2 ’23: $121MQ3 ’23: $158MQ4 ’23: $194MQ4 ’23Q1 ’24: $179MQ2 ’24: $177MQ3 ’24: $227MQ4 ’24: $214MQ4 ’24Q1 ’25: $176MQ2 ’25: $180MQ3 ’25: $208MQ4 ’25: $144MQ4 ’25filingsflow.com
QuarterSharesValue% of Portfolio
Q4 20251.71M$144M+0.40%
Q3 20252.39M$208M+0.54%
Q2 20252.31M$180M+0.48%
Q1 20252.29M$176M+0.49%
Q4 20242.57M$214M+0.52%
Q3 20242.62M$227M+0.56%
Q2 20242.81M$177M+0.46%
Q1 20242.79M$179M+0.46%
Q4 20232.95M$194M+0.56%
Q3 20233.44M$158M+0.53%
Q2 20233.32M$121M+0.39%
Q1 20231.84M$65M+0.23%
Q4 20222.59M$154M+0.59%
Q3 20222.71M$178M+0.70%
Q2 20222.69M$190M+0.70%
Q1 20222.77M$230M+0.69%
Q4 20212.47M$266M+0.72%
Q3 20212.17M$236M+0.67%
Q2 20212.22M$207M+0.65%
Q1 20212.36M$223M+0.72%
Q4 20202.51M$151M+0.50%
Q3 2020790.4K$25M+0.10%
Q2 2020742.0K$28M+0.11%
Q1 2020770.2K$24M+0.11%
Q4 2019410.8K$23M+0.09%
Q3 2019470.2K$22M+0.09%
Q2 2019479.5K$21M+0.09%
Q1 2019514.7K$21M+0.09%
Q4 2018534.1K$21M+0.10%

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 WEA.