| 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 | 8.3% | -17% | $384,420,645 | -$77,217,181 | 4,966,675 | -17% | JANA Partners Management, LP | 06 Nov 2025 |
| STATE STREET CORP | 5% | +2% | $148,612,454 | +$2,534,464 | 2,987,185 | +1.7% | STATE STREET CORPORATION | 31 Mar 2025 |
| 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 Dec 2025, 341 institutional investors reported holding 64,592,411 shares of MERCURY SYSTEMS INC - Common Stock (MRCY). This represents 107% of the company’s total 60,146,024 outstanding shares.
The largest institutional shareholders of MERCURY SYSTEMS INC - Common Stock (MRCY) together control 76% 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. | 14% | 8,611,638 | +1.6% | 0.01% | $628,735,659 |
| VANGUARD GROUP INC | 9.4% | 5,632,049 | -1.7% | 0.01% | $411,195,897 |
| JANA Partners Management, LP | 8.2% | 4,959,481 | -17% | 19% | $362,091,708 |
| STATE STREET CORP | 5.7% | 3,423,600 | +12% | 0.01% | $249,957,036 |
| Conestoga Capital Advisors, LLC | 3.6% | 2,174,807 | -4.6% | 2.7% | $158,782,659 |
| Invesco Ltd. | 3.2% | 1,910,742 | +25% | 0.02% | $139,503,273 |
| T. Rowe Price Investment Management, Inc. | 2.6% | 1,542,851 | +1.4% | 0.07% | $112,644,000 |
| DIMENSIONAL FUND ADVISORS LP | 2.5% | 1,475,821 | -15% | 0.02% | $107,752,953 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3% | 1,368,659 | +3.6% | 0.01% | $99,940,447 |
| AMERIPRISE FINANCIAL INC | 2.1% | 1,289,685 | +360% | 0.02% | $94,159,992 |
| FIRST TRUST ADVISORS LP | 2.1% | 1,279,384 | -17% | 0.07% | $93,407,825 |
| GOLDMAN SACHS GROUP INC | 1.9% | 1,156,397 | -6.7% | 0.01% | $84,428,545 |
| FMR LLC | 1.9% | 1,152,192 | -22% | 0% | $84,121,571 |
| NEUBERGER BERMAN GROUP LLC | 1.7% | 1,030,103 | -1.6% | 0.06% | $75,246,892 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.6% | 984,273 | -60% | 0.2% | $71,861,772 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.4% | 867,670 | +0.18% | 0.01% | $63,349,000 |
| Fisher Asset Management, LLC | 1.4% | 860,383 | -1.7% | 0.02% | $62,816,561 |
| LOOMIS SAYLES & CO L P | 1.4% | 851,817 | -3.7% | 0.08% | $62,191,159 |
| BAMCO INC /NY/ | 1.4% | 835,823 | -35% | 0.17% | $61,023,437 |
| Allspring Global Investments Holdings, LLC | 1.3% | 753,695 | +8.6% | 0.09% | $57,303,430 |
| SNYDER CAPITAL MANAGEMENT L P | 1.2% | 748,536 | -4.2% | 1% | $54,650,613 |
| MORGAN STANLEY | 1.2% | 730,676 | -17% | 0% | $53,346,796 |
| VAN ECK ASSOCIATES CORP | 1.2% | 725,387 | +0.63% | 0.04% | $52,961,000 |
| RAYMOND JAMES FINANCIAL INC | 1.2% | 708,054 | +267% | 0.02% | $52,067,593 |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.1% | 670,489 | +2.1% | 1% | $48,952,402 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 64,592,411 | $4,719,798,125 | -$64,366,868 | $73.01 | 341 |
| 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 |