Quick Takeaways
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC filed SCHEDULE 13G/A for MERCURY SYSTEMS INC Common Stock (MRCY).
- Disclosed ownership: 4.2%.
- Date of event: 30 Sep 2025.
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC - 30 Sep 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
- 60,146,024 shares
- Disclosed Ownership
- 2,526,133 shares
- Ownership
- 4.2%
- Form type
- SCHEDULE 13G/A
- Filing time
- 12 Nov 2025, 18:24:26 UTC
- Date of event
- 30 Sep 2025
- Previous filing
- 30 Jul 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC disclosed 4.2% ownership in MERCURY SYSTEMS INC Common Stock (MRCY) on 30 Sep 2025."
What Changed
- Previous schedule filing date: 30 Jul 2025.
- Current filing was accepted on 12 Nov 2025, 18:24.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 4.2% | 2,526,133 | 2,252,300 | 0 | Walter R. Randall, Jr. | Chief Compliance Officer |