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
352
Shares (Excl. Options)
64,227,527
Price
$72.91
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- Type / Class
- Equity / COMMON STOCK
- Symbol
- MRCY on Nasdaq
- Shares outstanding
- 60,401,859
- Price per share
- $74.75
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 64,227,527
- Total reported value
- $4,680,436,864
- % of total 13F portfolios
- 0.01%
- Share change
- -164,787
- Value change
- -$12,961,727
- Number of holders
- 352
- Price from insider filings
- $74.75
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- MRCY - MERCURY SYSTEMS INC - COMMON STOCK is tracked under CUSIP 589378108.
- 352 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 343 to 352 between Q4 2025 and Q1 2026.
- Reported value moved from $4,719,794,419 to $4,680,436,864.
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 352 institutions filings for Q1 2026.
Security key
589378108
Latest holder period
Q1 2026
13F holders
352
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:
Significant Owners of MERCURY SYSTEMS INC - COMMON STOCK (MRCY) based on Schedule 13D/G filings
| 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, 352 institutional investors reported holding 64,227,527 shares of MERCURY SYSTEMS INC - COMMON STOCK (MRCY). This represents 106% of the company’s total 60,401,859 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of MERCURY SYSTEMS INC - COMMON STOCK (MRCY) together control 73% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| 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 |
| 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 |
| BAMCO INC /NY/ | 1.1% | 645,066 | -23% | 0.14% | $47,031,762 |
Institutional Holders of MERCURY SYSTEMS INC - COMMON STOCK (MRCY) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 64,227,527 | $4,680,436,864 | -$12,961,727 | $72.91 | 352 |
| 2025 Q4 | 64,592,382 | $4,719,794,419 | -$64,370,574 | $73.01 | 343 |
| 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 |
| 2019 Q4 | 53,442,016 | $3,694,079,812 | -$42,971,719 | $69.11 | 265 |
| 2019 Q3 | 53,893,069 | $4,373,798,413 | +$80,775,444 | $81.17 | 279 |
| 2019 Q2 | 53,257,176 | $3,746,583,264 | +$528,830,559 | $70.35 | 271 |
| 2019 Q1 | 47,083,612 | $3,017,302,230 | -$91,675,334 | $64.08 | 239 |
| 2018 Q4 | 48,484,863 | $2,293,641,445 | -$69,571,507 | $47.29 | 192 |
| 2018 Q3 | 49,835,585 | $2,755,587,717 | -$81,943,696 | $55.32 | 207 |
| 2018 Q2 | 51,841,377 | $1,973,870,082 | +$158,977,441 | $38.06 | 192 |
| 2018 Q1 | 47,058,539 | $2,275,856,384 | +$91,228,453 | $48.32 | 214 |
| 2017 Q4 | 45,195,327 | $2,320,718,415 | -$72,739,048 | $51.35 | 215 |
| 2017 Q3 | 46,610,196 | $2,418,456,928 | +$15,203,562 | $51.88 | 209 |
| 2017 Q2 | 46,375,639 | $1,949,563,336 | -$25,370,557 | $42.09 | 198 |
| 2017 Q1 | 46,860,265 | $1,829,596,852 | +$574,913,366 | $39.05 | 188 |
| 2016 Q4 | 38,330,173 | $1,158,367,353 | +$39,206,014 | $30.22 | 177 |
| 2016 Q3 | 37,719,217 | $926,796,255 | +$15,872,884 | $24.57 | 159 |
| 2016 Q2 | 37,067,783 | $921,503,753 | +$160,174,361 | $24.86 | 170 |
| 2016 Q1 | 31,078,525 | $631,187,652 | +$1,011,376 | $20.30 | 159 |
| 2015 Q4 | 31,187,470 | $572,672,561 | +$5,235,155 | $18.36 | 147 |
| 2015 Q3 | 30,960,317 | $492,538,765 | +$8,270,851 | $15.91 | 144 |
| 2015 Q2 | 30,485,625 | $446,304,137 | +$7,969,225 | $14.64 | 131 |
| 2015 Q1 | 29,924,674 | $465,165,308 | +$3,919,104 | $15.55 | 127 |
| 2014 Q4 | 29,751,577 | $414,207,145 | +$6,439,761 | $13.92 | 121 |
| 2014 Q3 | 29,471,255 | $324,474,970 | +$8,060,104 | $11.01 | 120 |
| 2014 Q2 | 28,733,674 | $325,762,153 | +$5,620,698 | $11.34 | 119 |
| 2014 Q1 | 29,185,174 | $385,595,285 | +$193,434 | $13.21 | 108 |