Latest Period
Q1 2026
Security Snapshot
MERCURY SYSTEMS INC - COMMON STOCK (MRCY) Institutional Ownership
CUSIP: 589378108
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
355
Shares (Excl. Options)
65,171,822
Price
$72.91
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- MRCY on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 65,171,822
- Total 13F value
- $4,749,285,412
- Portfolio coverage rank
- 0.01%
- Share change
- +769,929
- Value change
- +$55,252,069
- Number of holders
- 355
- Shares outstanding
- 60,401,859
- SEC-reported price per share
- $91.95
- Insider filing price
- $91.95
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MRCY - MERCURY SYSTEMS INC - COMMON STOCK is tracked under CUSIP 589378108.
- 355 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 344 to 355 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $4,719,795,733 to $4,749,285,412.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 355 institutions filings for Q1 2026.
Security key
589378108
Latest holder period
Q1 2026
13F holders
355
13D/G owners
4
CIK / CUSIP context first
Open Q1 2026 holders
MRCY full holder history
MERCURY SYSTEMS INC SEC filings
MERCURY SYSTEMS INC company facts
MERCURY SYSTEMS INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 589378108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
4
Security
MRCY
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13% | $429,385,547 | 7,972,253 | BlackRock, Inc. | 30 Jun 2025 | |||
| JANA Partners Management, LP | 6.9% | -18% | $330,527,264 | -$68,445,739 | 4,114,618 | -17% | JANA Partners Management, LP | 03 Mar 2026 |
| STATE STREET CORP | 6.4% | +28% | $307,711,232 | +$69,931,306 | 3,865,719 | +29% | STATE STREET CORPORATION | 31 Mar 2026 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 4.2% | -46% | $195,522,694 | -$167,923,170 | 2,526,133 | -46% | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 30 Sep 2025 |
As of 31 Mar 2026, 355 institutional investors reported holding 65,171,822 shares of MERCURY SYSTEMS INC - COMMON STOCK (MRCY). This represents 108% of the company’s total 60,401,859 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
73%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 15% | 8,920,325 | +3.6% | 0.01% | $650,380,862 |
| JANA Partners Management, LP | 6.8% | 4,107,424 | -17% | 19% | $299,472,284 |
| STATE STREET CORP | 6.4% | 3,865,719 | +13% | 0.01% | $281,849,572 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.8% | 2,910,904 | 0% | 0.01% | $212,234,011 |
| Invesco Ltd. | 4% | 2,441,578 | +28% | 0.03% | $178,015,453 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4% | 2,403,818 | 0% | 0% | $175,262,370 |
| Conestoga Capital Advisors, LLC | 3.2% | 1,918,591 | -12% | 2.8% | $139,884,470 |
| T. Rowe Price Investment Management, Inc. | 2.6% | 1,579,832 | +2.4% | 0.08% | $115,186,000 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5% | 1,525,716 | +11% | 0.01% | $111,257,977 |
| DIMENSIONAL FUND ADVISORS LP | 2% | 1,227,975 | -17% | 0.02% | $89,518,765 |
| GOLDMAN SACHS GROUP INC | 2% | 1,201,112 | +3.9% | 0.01% | $87,573,077 |
| FIRST TRUST ADVISORS LP | 1.9% | 1,160,775 | -9.3% | 0.06% | $84,632,105 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.7% | 1,028,609 | +19% | 0.01% | $74,997,000 |
| AMERIPRISE FINANCIAL INC | 1.6% | 991,808 | -23% | 0.02% | $72,312,870 |
| Fisher Asset Management, LLC | 1.6% | 980,367 | +14% | 0.02% | $71,478,621 |
| SEGALL BRYANT & HAMILL, LLC | 1.5% | 934,824 | +47% | 0.98% | $68,158,018 |
| NEUBERGER BERMAN GROUP LLC | 1.5% | 910,418 | -12% | 0.05% | $66,256,335 |
| FMR LLC | 1.5% | 903,668 | -22% | 0% | $65,886,385 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.4% | 859,447 | +44% | 0.08% | $62,662,281 |
| VAN ECK ASSOCIATES CORP | 1.4% | 851,145 | +17% | 0.05% | $62,057,000 |
| RAYMOND JAMES FINANCIAL INC | 1.3% | 794,029 | +12% | 0.02% | $56,270,002 |
| WELLINGTON MANAGEMENT GROUP LLP | 1.3% | 755,525 | 0.01% | $55,085,328 | |
| JENNISON ASSOCIATES LLC | 1.1% | 688,114 | +53% | 0.03% | $50,170,391 |
| MORGAN STANLEY | 1.1% | 671,331 | -8.1% | 0% | $48,946,783 |
| LOOMIS SAYLES & CO L P | 1.1% | 645,932 | -24% | 0.06% | $47,094,902 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 65,171,822 | $4,749,285,412 | +$55,252,069 | $72.91 | 355 |
| 2025 Q4 | 64,592,400 | $4,719,795,733 | -$64,641,474 | $73.01 | 344 |
| 2025 Q3 | 64,854,395 | $5,021,217,838 | +$9,103,688 | $77.40 | 322 |
| 2025 Q2 | 65,052,617 | $3,502,859,076 | +$105,323,286 | $53.86 | 283 |
| 2025 Q1 | 63,147,239 | $2,720,880,477 | +$8,775,980 | $43.09 | 250 |
| 2024 Q4 | 63,439,538 | $2,664,519,810 | +$36,081,845 | $42.00 | 241 |
| 2024 Q3 | 63,027,047 | $2,331,459,720 | -$27,828,165 | $37.00 | 243 |
| 2024 Q2 | 64,646,067 | $1,744,804,465 | +$67,014,126 | $26.99 | 227 |
| 2024 Q1 | 62,255,672 | $1,836,471,127 | +$21,788,249 | $29.50 | 219 |
| 2023 Q4 | 60,956,989 | $2,231,778,480 | +$38,708,210 | $36.57 | 215 |
| 2023 Q3 | 59,786,742 | $2,217,503,343 | +$116,648,980 | $37.09 | 212 |
| 2023 Q2 | 56,139,370 | $1,941,904,900 | -$69,057,890 | $34.59 | 226 |
| 2023 Q1 | 57,561,217 | $2,942,502,144 | -$26,595,282 | $51.12 | 240 |
| 2022 Q4 | 58,356,442 | $2,611,599,946 | +$50,252,873 | $44.74 | 228 |
| 2022 Q3 | 57,288,655 | $2,327,718,534 | -$3,452,854 | $40.60 | 219 |
| 2022 Q2 | 56,787,775 | $3,651,238,074 | -$91,955,080 | $64.33 | 242 |
| 2022 Q1 | 58,454,146 | $3,767,454,831 | +$98,101,206 | $64.45 | 239 |
| 2021 Q4 | 57,096,688 | $3,144,225,287 | +$246,658,849 | $55.06 | 240 |
| 2021 Q3 | 52,888,511 | $2,509,381,997 | -$4,175,927 | $47.42 | 244 |
| 2021 Q2 | 52,344,504 | $3,469,365,614 | +$23,996,075 | $66.28 | 246 |
| 2021 Q1 | 53,043,167 | $3,748,686,698 | -$89,475,161 | $70.65 | 275 |
| 2020 Q4 | 53,759,295 | $4,732,447,668 | -$10,717,008 | $88.06 | 266 |
| 2020 Q3 | 53,993,403 | $4,182,578,073 | -$284,626 | $77.46 | 272 |
| 2020 Q2 | 53,974,979 | $4,245,537,917 | -$105,107,970 | $78.66 | 285 |
| 2020 Q1 | 55,274,009 | $3,943,878,540 | +$121,898,878 | $71.34 | 255 |