William Blair Investment Management, Llc - Mar 31, 2025 SCHEDULE 13G/A Report for ADTRAN Holdings, Inc. Common Stock (ADTN)

Filing Manager: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Reporting Manager: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Security: ADTRAN Holdings, Inc. Common Stock
Symbol: ADTN
Shares outstanding: 79.9M shares
Disclosed Ownership: 3.35M shares
Ownership: 4.2%
Form type: SCHEDULE 13G/A
Date filed: 5/9/2025, 04:54 PM
Date of event: Mar 31, 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	4.2%	3.35M	2.18M	0	Stephanie Braming	Partner, Global Head of Investment Management