William Blair Investment Management, Llc - Jun 30, 2025 SCHEDULE 13G/A Report for MERCURY SYSTEMS INC Common Stock (MRCY)

Filing Manager: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Reporting Manager: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Security: MERCURY SYSTEMS INC Common Stock
Symbol: MRCY
Shares outstanding: 59.4M shares
Disclosed Ownership: 4.7M shares
Ownership: 7.9%
Form type: SCHEDULE 13G/A
Date filed: 7/30/2025, 11:21 AM
Date of event: Jun 30, 2025
Previous filing: May 9, 2025
Next filing: Nov 12, 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	7.9%	4.7M	4.38M	0	Walter R. Randall, Jr.	Chief Compliance Officer