Mercury Systems Ownership | Who Owns Mercury Systems?

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Mercury Systems Ownership Summary

Mercury Systems is owned by 21.44% institutional investors, 1.72% insiders, and 76.84% retail investors. Blackrock is the largest institutional shareholder, holding 15.27% of MRCY shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 5.29% of its assets in Mercury Systems shares.

MRCY Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Mercury Systems	21.44%	1.72%	76.84%
Sector	Industrials Stocks	47.66%	12.56%	39.78%
Industry	Defense Stocks	48.36%	10.81%	40.83%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	8.81M	15.27%	$237.75M
Blackrock funding, inc. /de	8.61M	14.49%	$628.74M
Jana partners management, lp	5.96M	10.11%	$461.26M
Vanguard group	5.63M	9.48%	$411.20M
State street	3.06M	5.19%	$236.48M
Conestoga capital advisors	2.17M	3.66%	$158.78M
First trust advisors lp	1.53M	2.60%	$118.64M
Invesco	1.53M	2.59%	$118.22M
T. rowe price investment management	1.52M	2.58%	$117.78M
Fmr	1.48M	2.52%	$114.82M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Jana partners management, lp	5.96M	22.33%	$461.26M
13d management	137.01K	10.17%	$10.60M
Archon capital management	74.60K	3.10%	$5.45B
Conestoga capital advisors	2.17M	2.67%	$158.78M
Steel partners	66.54K	2.27%	$1.80M
Sasco capital inc / ct/	561.03K	2.14%	$15.14M
Lisanti capital growth	94.27K	1.63%	$6.88M
Mesirow institutional investment management	500.83K	1.62%	$21.03M
Deepwater asset management	67.46K	1.43%	$4.93M
Aristotle capital boston	307.04K	1.22%	$23.76M

Top Buyers

Holder	Shares	% Assets	Change
Blackrock	8.81M	0.01%	1.40M
Invesco	1.53M	0.02%	943.74K
Price t rowe associates inc /md/	866.08K	0.01%	822.09K
First trust advisors lp	1.53M	0.09%	751.81K
Millennium management	1.02M	0.02%	677.89K

Top Sellers

Holder	Shares	% Assets	Change
Starboard value lp	-	-	-2.29M
William blair investment management	984.27K	0.20%	-1.50M
Victory capital management	750.32K	0.03%	-1.01M
Jana partners management, lp	5.96M	22.33%	-793.93K
Westwood group	-	-	-787.79K

New Positions

Holder	Shares	% Assets	Change	Value
Deepwater asset management	67.46K	1.43%	67.46K	$4.93M
Nordea investment management ab	67.39K	0.00%	67.39K	$4.95M
Portolan capital management	44.86K	0.19%	44.86K	$3.47M
Edgestream partners	31.10K	0.07%	31.10K	$2.41M
Quantbot technologies lp	28.19K	0.07%	28.19K	$2.06M

Sold Out

Holder	Change
Stephens consulting	-1.00
Capital performance advisors llp	-4.00
Gradient investments	-5.00
Mendota financial group	-6.00
Quarry lp	-7.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	116	-64.95%	12,737,056	-80.36%	21	0.18%	47	-73.14%	38	-64.81%
Sep 30, 2025	135	-53.77%	14,134,983	-78.27%	23	0.20%	73	-56.80%	39	-49.35%
Jun 30, 2025	288	12.06%	64,959,692	2.93%	110	0.96%	165	30.95%	77	-13.48%
Mar 31, 2025	254	2.01%	63,101,197	-0.66%	107	0.91%	124	7.83%	89	2.30%
Dec 31, 2024	227	-9.20%	59,582,534	-5.47%	102	0.87%	105	-6.25%	81	-11.96%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	3.17M	5.29%	1.15K
Stt Strt® SPDR® S&P® Arspc & Dfnc ETF	1.73M	2.88%	-5.70K
Vanguard Total Stock Mkt Idx Inv	1.71M	2.84%	3.74K
Vanguard US Total Market Shares ETF	1.60M	2.69%	1.79K
Victory Small Cap Value CIT (Net 75)	1.56M	2.62%	240.00K
iShares Russell 2000 ETF	1.32M	2.20%	-10.76K
SPDR® S&P Aerospace & Defense ETF	1.26M	2.10%	-
Victory Sycamore Small Company Opp R	1.25M	2.09%	-52.00K
Vanguard Small Cap Index	1.23M	2.05%	3.50K
William Blair Sml-Mid Cap Grwth CIT Cl A	1.17M	1.96%	1.17M

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 02, 2026	JANA Partners Management, LP	See Remarks	Sell	$17.17M
Mar 03, 2026	JANA Partners Management, LP	See Remarks	Sell	$15.20M
Mar 04, 2026	JANA Partners Management, LP	See Remarks	Sell	$9.05M
Feb 25, 2026	LANCE HOWARD L	-	Sell	$429.96K
Feb 17, 2026	KUPINSKY STUART	EVP, CLO & Corp Sec	Sell	$191.09K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	7
2025 Q4	-	3
2025 Q3	-	13
2025 Q2	-	7
2025 Q1	-	3

MRCY Ownership FAQ

Who Owns Mercury Systems?

Mercury Systems shareholders are primarily institutional investors at 21.44%, followed by 1.72% insiders and 76.84% retail investors. The average institutional ownership in Mercury Systems's industry, Defense Stocks, is 48.36%, which Mercury Systems falls below.

Who owns the most shares of Mercury Systems?

Mercury Systems’s largest shareholders are Blackrock (8.81M shares, 15.27%), Blackrock funding, inc. /de (8.61M shares, 14.49%), and Jana partners management, lp (5.96M shares, 10.11%). Together, they hold 39.88% of Mercury Systems’s total shares outstanding.

Does Blackrock own Mercury Systems?

Yes, BlackRock owns 15.27% of Mercury Systems, totaling 8.81M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 237.75M$. In the last quarter, BlackRock increased its holdings by 1.4M shares, a 18.95% change.

Who is Mercury Systems’s biggest shareholder by percentage of total assets invested?

Jana partners management, lp is Mercury Systems’s biggest shareholder by percentage of total assets invested, with 22.33% of its assets in 5.96M Mercury Systems shares, valued at 461.26M$.

Who is the top mutual fund holder of Mercury Systems shares?

iShares Core S&P Small-Cap ETF is the top mutual fund holder of Mercury Systems shares, with 5.29% of its total shares outstanding invested in 3.17M Mercury Systems shares.

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