---
schema_version: "secwatch.filing_event.v1"
accession: "0001049521-21-000066"
form_type: "8-K"
ticker: "MRCY"
cik: "0001049521"
company_name: "MERCURY SYSTEMS INC"
filed_at: "2021-12-29T23:59:59+00:00"
generated_at: "2026-06-27T21:51:43.872764+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Mercury Systems adopts one-year shareholder rights plan with 7.5% trigger

## Summary
- Board unanimously adopted Rights Plan to protect shareholder value amid perceived undervaluation of shares.
- Rights trigger at 7.5% beneficial ownership (10% for passive institutional investors).
- Each Right entitles holder to purchase preferred shares worth twice the market value of common shares upon trigger.
- Rights expire after one year; distributed as a dividend to stockholders of record on January 10, 2022.
- Plan designed to allow Board time to evaluate any unsolicited acquisition offers and negotiate full value.

## SEC filing metadata
- accession: 0001049521-21-000066
- form_type: 8-K
- ticker: MRCY
- cik: 0001049521
- company_name: MERCURY SYSTEMS INC
- filed_at: 2021-12-29T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 3.03, 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1049521/000104952121000066/0001049521-21-000066-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1049521/000104952121000066/mrcy-20211229.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001049521-21-000066
- JSON: https://secwatch.observer/filing/0001049521-21-000066.json
- Plain text: https://secwatch.observer/filing/0001049521-21-000066.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.