Security Snapshot

MERCURY SYSTEMS INC - Common Stock (MRCY) Institutional Ownership

CUSIP: 589378108

13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026

Latest Period

Q4 2025

Institutions Reporting

343

Shares (Excl. Options)

64,592,382

Price

$73.01

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Type / Class
Equity / Common Stock
Symbol
MRCY on Nasdaq
Shares outstanding
59,632,145
Price per share
$72.91
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
64,592,382
Total reported value
$4,719,794,419
% of total 13F portfolios
0.01%
Share change
-861,871
Value change
-$64,370,574
Number of holders
343
Price from insider filings
$72.91
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • MRCY - MERCURY SYSTEMS INC - Common Stock is tracked under CUSIP 589378108.
  • 343 institutions reported positions in Q4 2025.
  • 4 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 343 to 47 between Q4 2025 and Q1 2026.
  • Reported value moved from $4,719,794,419 to $27,790,699.

Why This Matters

  • 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.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 343 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 589378108?
CUSIP 589378108 identifies MRCY - MERCURY SYSTEMS INC - Common Stock in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

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 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, 343 institutional investors reported holding 64,592,382 shares of MERCURY SYSTEMS INC - Common Stock (MRCY). This represents 108% of the company’s total 59,632,145 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of MERCURY SYSTEMS INC - Common Stock (MRCY) together control 77% 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 8.3% 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 2.2% 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 1.7% 984,273 -60% 0.2% $71,861,772
PRICE T ROWE ASSOCIATES INC /MD/ 1.5% 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 1.3% 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

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 384,304 $27,790,699 -$984,412 $72.91 47
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