William Blair Investment Management, Llc - Mar 31, 2025 SCHEDULE 13G Report for Montrose Environmental Group, Inc. Common Stock (MEG)

Filing Manager: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Reporting Manager: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Security: Montrose Environmental Group, Inc. Common Stock
Symbol: MEG
Shares outstanding: 34.6M shares
Disclosed Ownership: 1.9M shares
Ownership: 5.5%
Form type: SCHEDULE 13G
Date filed: 5/9/2025, 04:13 PM
Date of event: Mar 31, 2025
Next filing: Jul 30, 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	5.5%	1.9M	1.59M	0	Stephanie Braming	Partner, Global Head of Investment Management