Company · Ownership research

MERCURY SYSTEMS INC MRCY

CIK 0001049521 · CUSIP 589378108

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 589378108 (MRCY), not CUSIP 589378908 (MRCY), CUSIP 589378958 (MRCY), and does not merge CUSIPs.

This page lists the top 20 of 150 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$120.34M 1,449,574 shares	0.01%	-10.00K(-0.70%)Reduced	SEC filing ↗ Nov 6, 2026	▾
02	Conestoga Capital Advisors, LLC CIK 1163744 · View history	$98.82M 1,190,557 shares	2.98%	-296.63K(-19.90%)Reduced	SEC filing ↗ Nov 2, 2026	▾
03	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$97.49M 1,174,552 shares	0.02%	+17.87K(+1.50%)Added	SEC filing ↗ Nov 4, 2026	▾
04	Fisher Asset Management, LLC CIK 850529 · View history	$72.61M 874,874 shares	0.02%	-69.19K(-7.30%)Reduced	SEC filing ↗ Nov 6, 2026	▾
05	Allspring Global Investments Holdings, LLC CIK 1890906 · View history	$41.73M 496,387 shares	0.07%	+21.52K(+4.50%)Added	SEC filing ↗ Nov 4, 2026	▾
06	WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC CIK 1644956 · View history	$31.15M 375,351 shares	0.10%	-4.38K(-1.20%)Reduced	SEC filing ↗ Nov 6, 2026	▾
07	Bank of New York Mellon Corp CIK 1390777 · View history	$26.17M 315,327 shares	0.00%	+1.11K(+0.40%)Added	SEC filing ↗ Nov 5, 2026	▾
08	PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · View history	$22.46M 270,566 shares	0.01%	+12.01K(+4.60%)Added	SEC filing ↗ Nov 2, 2026	▾
09	Thrivent Financial for Lutherans CIK 314984 · View history	$18.66M 224,877 shares	0.03%	+17.84K(+8.60%)Added	SEC filing ↗ Nov 5, 2026	▾
10	KING LUTHER CAPITAL MANAGEMENT CORP CIK 310051 · View history	$18.60M 224,134 shares	0.08%	-4.69K(-2.10%)Reduced	SEC filing ↗ Nov 5, 2026	▾
11	FIFTH THIRD BANCORP CIK 35527 · View history	$18.23M 219,594 shares	0.03%	-2.80K(-1.30%)Reduced	SEC filing ↗ Nov 5, 2026	▾
12	MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC CIK 922127 · View history	$16.09M 193,870 shares	0.16%	-7.00K(-3.50%)Reduced	SEC filing ↗ Oct 23, 2026	▾
13	Swedbank AB CIK 946431 · View history	$14.40M 173,546 shares	0.01%	-70.75K(-29.00%)Reduced	SEC filing ↗ Oct 27, 2026	▾
14	BARCLAYS PLC CIK 312069 · View history	$10.78M 129,872 shares	0.00%	+75.38K(+138.30%)Added	SEC filing ↗ Nov 6, 2026	▾
15	DEUTSCHE BANK AG\ CIK 948046 · View history	$9.70M 116,879 shares	0.00%	-25.80K(-18.10%)Reduced	SEC filing ↗ Nov 6, 2026	▾
16	Russell Investments Group, Ltd. CIK 1692234 · View history	$9.06M 109,181 shares	0.01%	+15.30K(+16.30%)Added	SEC filing ↗ Nov 6, 2026	▾
17	AGMAN CAPITAL LLC CIK 2107832 · View history	$8.37M 100,803 shares	5.88%	-1.60K(-1.60%)Reduced	SEC filing ↗ Oct 29, 2026	▾
18	Creative Planning CIK 1540235 · View history	$5.75M 69,264 shares	0.00%	+17.50K(+33.80%)Added	SEC filing ↗ Nov 2, 2026	▾
19	IMC-Chicago, LLC CIK 1452861 · View history	$4.65M 56,034 shares	0.04%	+56.03KNew	SEC filing ↗ Nov 5, 2026	▾
20	MOODY NATIONAL BANK TRUST DIVISION CIK 1092903 · View history	$4.43M 53,383 shares	0.37%	+7.18K(+15.50%)Added	SEC filing ↗ Oct 6, 2026	▾

Showing 20 / 150 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

150

Cancelled or null records excluded

Disclosed shares

8,493,681

Not deduplicated across managers

Disclosed value

$705.15M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

MERCURY SYSTEMS INC · Q3 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.