William Blair Investment Management, LLC

CIK 1644956 · operating company. SEC filings, financial statements, 10-K sections, 8-K items and insider trades for William Blair Investment Management, LLC.

Recent SEC filings

FiledFormAccession number
Aug 17, 2026N-PX0001193125-26-353689
Aug 12, 202613F-HR0001644956-26-000023
Aug 11, 2026SCHEDULE 13G/A0001644956-26-000025
Aug 11, 2026SCHEDULE 13G0001644956-26-000026
Aug 11, 2026SCHEDULE 13G/A0001644956-26-000024
May 8, 202613F-HR0001644956-26-000021
May 8, 2026SCHEDULE 13G0001644956-26-000020
May 7, 2026SCHEDULE 13G/A0001644956-26-000014
May 7, 2026SCHEDULE 13G/A0001644956-26-000017
May 7, 2026SCHEDULE 13G/A0001644956-26-000016
May 7, 2026SCHEDULE 13G/A0001644956-26-000019
May 7, 2026SCHEDULE 13G0001644956-26-000015
May 7, 2026SCHEDULE 13G/A0001644956-26-000018
May 7, 2026SCHEDULE 13G/A0001644956-26-000013
Feb 9, 2026SCHEDULE 13G0001644956-26-000012
Feb 9, 2026SCHEDULE 13G/A0001644956-26-000008
Feb 9, 2026SCHEDULE 13G/A0001644956-26-000010
Feb 9, 2026SCHEDULE 13G0001644956-26-000011
Feb 9, 2026SCHEDULE 13G/A0001644956-26-000009
Feb 9, 202613F-HR0001644956-26-000007
Jan 29, 202640-APP0001193125-26-028753
Dec 1, 2025SCHEDULE 13G/A0001644956-25-000053
Aug 27, 2025N-PX0001021408-25-003739
Aug 1, 2025SCHEDULE 13G/A0001644956-25-000042
Aug 1, 2025SCHEDULE 13G/A0001644956-25-000041