Welcome to our dedicated page for Mercury Sys SEC filings (Ticker: MRCY), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Locating program backlogs, classified contract risks, and acquisition details in Mercury Systems� dense disclosures can feel like mission planning without a map. Mercury Systems SEC filings explained simply are critical because defense contractors must report complex export-control notes, cybersecurity clauses, and multi-year government funding streams that easily span hundreds of pages.
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William Blair Investment Management, LLC filed Amendment No. 8 to Schedule 13G disclosing its beneficial ownership of Mercury Systems, Inc. (MRCY) common stock as of 30 June 2025.
- Owns 4,695,683 shares, equal to 7.9 % of the outstanding class.
- Holds sole voting power over 4,375,808 shares and sole dispositive power over the full 4,695,683 shares; no shared authority reported.
- Filed under Rule 13d-1(b) as a registered investment adviser (IA) organized in Delaware.
- Certification states the position is held in the ordinary course of business and not to influence control of the issuer.
The filing confirms a sizable institutional stake but does not provide financial performance data or signal strategic changes at Mercury Systems.