Security key
589378108
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 64,854,395
- Total 13F value
- $5,021,217,838
- Share change
- -154,949
- Put/Call ratio
- 92%
- SEC-reported price per share
- $77.40
- Number of holders
- 322
- Value change
- +$9,103,688
- Number of buys
- 173
- Number of sells
- 134
- Shares outstanding
- 60,158,713
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2025
Institutions
322
Top holders
10
MRCY full security history
Ownership snapshot
Full 13F holder table
MERCURY SYSTEMS INC SEC filings
MERCURY SYSTEMS INC company facts
Broader feeds
Ownership snapshot
Top reported holders of MRCY - MERCURY SYSTEMS INC - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
WILLIAM BLAIR INVESTMENT ...
Disclosed value leader
BlackRock, Inc.
Comparable rows
15/15
Latest evidence
30 Jun 2025
13F
13D/G
Lead comparable stake: 4.2%
13D/G row: WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Showing 1-6 of 15 holder rows.
Quick read
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC leads the comparable SEC ownership view at 4.2%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's linked filing trail.
Comparable ownership
Top 5
WILLIAM BLAIR INVESTMENT MANAGEME...
4.2%
BlackRock, Inc.
14%
JANA Partners Management, LP
11%
VANGUARD GROUP INC
9.2%
STATE STREET CORP
5.4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC |
13F
13D/G
Company
|
4.2%
from 13D/G
|
$252,909,486
4,695,683 shares
|
— | 30 Jun 2025 |
| BlackRock, Inc. |
13F
Company
|
14%
|
$444,289,472
8,248,969 shares
|
— | 30 Jun 2025 |
| JANA Partners Management, LP |
13F
Company
|
11%
|
$363,738,824
6,753,413 shares
|
— | 30 Jun 2025 |
| VANGUARD GROUP INC |
13F
Company
|
9.2%
|
$296,765,368
5,509,940 shares
|
— | 30 Jun 2025 |
| STATE STREET CORP |
13F
Company
|
5.4%
|
$174,860,422
3,246,573 shares
|
— | 30 Jun 2025 |
| Conestoga Capital Advisors, LLC |
13F
Company
|
4.3%
|
$137,824,239
2,558,935 shares
|
— | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
322
Shares
64,854,395
Rows available
322
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
283
Q3 2025 holders
322
Holder diff
39
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|