WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC - 31 Mar 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: 79,865,095 shares
Disclosed Ownership: 3,354,334 shares
Ownership: 4.2%
Form type: SCHEDULE 13G/A
Filing time: 09 May 2025, 16:54:27 UTC
Date of event: 31 Mar 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%	3,354,334	2,184,298	0	Stephanie Braming	Partner, Global Head of Investment Management