# Mercury Systems (MRCY): value investors who own it

1 value investor held Mercury Systems in their Q3 2026 13F, led by Polen Capital Management. See who bought, sold and how ownership has changed by quarter.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Polen Capital Management | 0.0% | $355k | New | 1 |

## Directors buying and selling (Form 4, last 12 months)

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-09-21 | KUPINSKY STUART | EVP, CLO & Corp Sec | Sold | 1000 | $87k |
| 2026-09-03 | Ratner Steven | EVP, CHRO | Sold | 4000 | $338k |
| 2026-08-26 | Ballhaus William L | Chairman, President & CEO | Sold | 38276 | $3.4m |
| 2026-08-26 | Ballhaus William L | Chairman, President & CEO | Sold | 10814 | $970k |
| 2026-08-25 | Ballhaus William L | Chairman, President & CEO | Sold | 107628 | $9.4m |
| 2026-08-25 | Ballhaus William L | Chairman, President & CEO | Sold | 3448 | $303k |
| 2026-08-24 | Ballhaus William L | Chairman, President & CEO | Sold | 105471 | $9.4m |
| 2026-08-24 | Ballhaus William L | Chairman, President & CEO | Sold | 2738 | $248k |
| 2026-08-21 | Ballhaus William L | Chairman, President & CEO | Sold | 64796 | $6.0m |
| 2026-08-21 | KUPINSKY STUART | EVP, CLO & Corp Sec | Sold | 1000 | $95k |
| 2026-08-21 | Ratner Steven | EVP, CHRO | Sold | 356 | $33k |
| 2026-08-21 | Ballhaus William L | Chairman, President & CEO | Sold | 204 | $19k |
| 2026-08-20 | Ballhaus William L | Chairman, President & CEO | Sold | 22010 | $2.1m |
| 2026-08-20 | Farnsworth David E. | EVP, CFO | Sold | 6612 | $646k |
| 2026-08-20 | Ratner Steven | EVP, CHRO | Sold | 1026 | $100k |
| 2026-08-20 | Munro Douglas | SVP, CAO | Sold | 109 | $11k |
| 2026-08-19 | Ballhaus William L | Chairman, President & CEO | Sold | 26802 | $2.7m |
| 2026-08-19 | Farnsworth David E. | EVP, CFO | Sold | 8155 | $818k |
| 2026-08-19 | Ratner Steven | EVP, CHRO | Sold | 2187 | $219k |
| 2026-08-19 | KUPINSKY STUART | EVP, CLO & Corp Sec | Sold | 1308 | $131k |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/mrcy). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.