Mercury Systems Inc (MRCY)
Nasdaq: MRCY · Electronic Components & Accessories · Andover, MA · filing with the SEC since 1997
Grade4.6
◀ Past 4.4● Present 4.2▶ Future 5.3
Who owns Mercury Systems Inc
As filed with the SECHolders of 5% or more
4
Blackrock, Inc. holds 14.4% of Common Stock, as its SCHEDULE 13G/A filed Jul 29, 2026 says.
Directors and officers
14
report now, of 37 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.
Holders of 5% or moreshare of the class, as filed
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 29, 2026 · Common Stock · 13.3% in Jul 17, 2025
JANA Partners Management, LP
SCHEDULE 13D/A · filed Mar 4, 2026 · Common Stock, par value $0.01 per share · 8.3% in Nov 10, 2025
State Street Corporation
SCHEDULE 13G · filed May 12, 2026 · COMMON STOCK · 5% in May 13, 2025
Vanguard Portfolio Management
SCHEDULE 13G · filed Jul 31, 2026 · Common Stock
William Blair Investment Management, LLC
SCHEDULE 13G/A · filed Nov 12, 2025 · Common Stock · reported falling below 5%, from 7.9% in Jul 30, 2025
The Vanguard Group
SCHEDULE 13G/A · filed Mar 27, 2026 · Common Stock · reported falling below 5%
What MRCY reports owning in othersstakes of 5% or more, and other ties
6 subsidiaries in 5 countries, from the list filed with the 10-K filed Aug 18, 2026.
Insider tradesForm 4
47sales
0purchases
3sales on a scheduled plan
9people selling
$194Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Oct 30, 2025 to Oct 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window9 of 37 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Jana Partners Management, LP | director | 5 | $149M | 0 | 0 | $0 |
| Ballhaus William L | Chairman, President & CEO | 12 | $37.7M | 0 | 0 | $0 |
| Farnsworth David E. | EVP, CFO | 5 | $2.7M | 0 | 0 | $0 |
| Lance Howard L | director | 3 | $1.4M | 0 | 0 | $0 |
| Ratner Steven | EVP, CHRO | 7 | $1.2M | 0 | 0 | $0 |
| Kupinsky Stuart | EVP, CLO & Corp Sec | 7 | $800,000 | 3 | 0 | $0 |
| Carvalho Orlando D | director | 1 | $600,000 | 0 | 0 | $0 |
| Munro Douglas | SVP, CAO | 6 | $300,000 | 0 | 0 | $0 |
| Plunkett Debora A | director | 1 | $100,000 | 0 | 0 | $0 |