Mercury Systems, Inc.
Mercury Systems, Inc. (MRCY) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MRCY · as of Mar 31, 2025
Ownership Breakdown
259
Institutional Holders
▲ 8 vs Q4
$2.72B
Total Inst. Value
▲ $43.84M vs Q4
60.04M
Shares Outstanding
freeFloat 92.47%
63.15M
13F Shares Held
▼ 368,601 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MRCY largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. electronic components & accessories | 8.77M | 14.93% | 14.93% | $377.93B | May 2, 2025 | ▼ 50.1K |
JANA PARTNERS MANAGEMENT, LP electronic components & accessories | 6.94M | 11.82% | 11.82% | $299.11B | May 15, 2025 | — held |
VANGUARD GROUP INC electronic components & accessories | 5.50M | 9.36% | 9.36% | $237.03B | May 9, 2025 | ▼ 49.8K |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC electronic components & accessories | 5.37M | 9.14% | 9.14% | $231.49B | May 9, 2025 | ▼ 1.06M |
STATE STREET CORP electronic components & accessories | 2.99M | 5.08% | 5.08% | $128.72B | May 15, 2025 | ▲ 50.9K |
CONESTOGA CAPITAL ADVISORS, LLC electronic components & accessories | 2.26M | 3.84% | 3.84% | $97.31B | Apr 17, 2025 | ▲ 185.4K |
DIMENSIONAL FUND ADVISORS LP electronic components & accessories | 2.04M | 3.48% | 3.48% | $88.08B | May 13, 2025 | ▼ 157.9K |
VICTORY CAPITAL MANAGEMENT INC electronic components & accessories | 1.73M | 2.95% | 2.95% | $74.75B | May 2, 2025 | ▼ 325.3K |
GEODE CAPITAL MANAGEMENT, LLC electronic components & accessories | 1.26M | 2.15% | 2.15% | $54.50B | May 13, 2025 | ▲ 34.3K |
BAMCO INC /NY/ electronic components & accessories | 1.20M | 2.04% | 2.04% | $51.54B | May 15, 2025 | ▼ 5.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
20
Increased
+2.63M shares2
New Positions
first time holders27
Decreased
−3.39M shares0
Sold Out
fully exitedNet shares change (top 50)
759.7K
+2.63M / −3.39M
Net new holders
-5
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MRCY insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
5
Sell transactions
0.20
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
LANCE HOWARD L director | May 26, 2026 | Sale | 8,000 | $99.95 | $799.6K | 1.3K | Form 4 ↗ |
LANCE HOWARD L director | May 26, 2026 | Sale | 1,250 | $98.50 | $123.1K | 0 | Form 4 ↗ |
Carvalho Orlando D director | May 12, 2026 | Sale | 7,000 | $89.36 | $625.5K | 52.4K | Form 4 ↗ |
Ratner Steven EVP, CHRO | May 11, 2026 | Sale | 2,000 | $92.46 | $184.9K | 32.2K | Form 4 ↗ |
Nearhos Barry R director | Apr 16, 2026 | Award | 245 | — | — | 31.3K | Form 4 ↗ |
Farnsworth David E. EVP, CFO | Apr 16, 2026 | Sale | 3,625 | $84.87 | $307.7K | 157.7K | Form 4 ↗ |
Ratner Steven EVP, CHRO | Mar 16, 2026 | Award | 437 | — | — | 34.2K | Form 4 ↗ |
JANA Partners Management, LP See Remarks | Mar 2, 2026 | Sale | 182,510 | $94.05 | $17.17M | 4.38M | Form 4 ↗ |
JANA Partners Management, LP See Remarks | Mar 3, 2026 | Sale | 168,648 | $90.12 | $15.20M | 4.22M | Form 4 ↗ |
JANA Partners Management, LP See Remarks | Mar 4, 2026 | Sale | 100,899 | $89.68 | $9.05M | 4.11M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Mercury Systems, Inc. (MRCY) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 7.53%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Mercury Systems, Inc. is BLACKROCK, INC., holding approximately 8.77 million shares — equal to 14.93% of outstanding shares — as of March 31, 2025.
A total of 259 institutional investors currently hold MRCY stock, with a combined institutional value of approximately $2.72 billion as of the most recent 13F filing period.
Frequently asked questions
MRCY ownershipMercury Systems, Inc. (MRCY) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is BLACKROCK, INC. with a 14.93% stake. Company insiders hold 7.53%. Data sourced from SEC Form 13F as of March 31, 2025.