Mercury Systems Ownership | Who Owns Mercury Systems?

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Mercury Systems Ownership Summary

Mercury Systems is owned by 110.24% institutional investors, 1.87% insiders. 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 5.08% of its assets in Mercury Systems shares.

MRCY Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Mercury Systems	110.24%	1.87%	-12.12%
Sector	Industrials Stocks	64.07%	12.69%	23.24%
Industry	Defense Stocks	62.16%	10.39%	27.46%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	8.81M	15.27%	$237.75M
Blackrock funding, inc. /de	8.25M	14.00%	$444.29M
Jana partners management, lp	6.75M	11.46%	$363.74M
Vanguard group	5.55M	9.53%	$233.13M
William blair investment management	4.70M	7.97%	$252.91M
State street	3.33M	5.77%	$89.80M
Conestoga capital advisors	2.56M	4.34%	$137.82M
Dimensional fund advisors lp	2.20M	3.78%	$92.49M
Victory capital management	2.06M	3.54%	$86.53M
Segall bryant & hamill	1.27M	2.18%	$53.37M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Jana partners management, lp	6.75M	18.27%	$363.74M
Scopia capital management lp	446.62K	2.94%	$24.06M
13d management	131.29K	2.59%	$3.54M
Steel partners	66.54K	2.27%	$1.80M
Archon capital management	49.60K	2.19%	$2.67M
Sasco capital inc / ct/	561.03K	2.14%	$15.14M
Conestoga capital advisors	2.56M	2.04%	$137.82M
Mesirow institutional investment management	500.83K	1.62%	$21.03M
Lisanti capital growth	94.20K	1.41%	$5.07M
Snyder capital management l p	957.90K	1.10%	$51.59M

Top Buyers

Holder	Shares	% Assets	Change
Blackrock	8.81M	0.01%	1.40M
T. rowe price investment management	968.82K	0.03%	968.82K
Loomis sayles & co l p	992.61K	0.07%	757.22K
Millennium management	1.02M	0.02%	677.89K
Fmr	555.99K	0.00%	552.93K

Top Sellers

Holder	Shares	% Assets	Change
Starboard value lp	-	-	-2.29M
Fuller & thaler asset management	5.46K	0.00%	-1.17M
Westwood group	-	-	-787.79K
William blair investment management	4.70M	0.67%	-676.51K
Clearline capital lp	-	-	-526.61K

New Positions

Holder	Shares	% Assets	Change	Value
T. rowe price investment management	968.82K	0.03%	968.82K	$52.18M
Lord, abbett	552.65K	0.10%	552.65K	$29.77M
Emerald advisers	456.71K	0.90%	456.71K	$24.60M
Silvercrest asset management group	387.12K	0.14%	387.12K	$20.85M
Emerald mutual fund advisers trust	263.22K	0.86%	263.22K	$14.18M

Sold Out

Holder	Change
Capital performance advisors llp	-4.00
Gradient investments	-5.00
Mendota financial group	-6.00
Global financial private client	-8.00
International assets investment management	-10.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Sep 30, 2024	248	3.33%	63,023,819	-2.69%	108	0.86%	112	-12.50%	92	16.46%
Jun 30, 2024	240	4.35%	64,763,048	3.91%	112	0.96%	128	-3.76%	79	14.49%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	3.03M	5.08%	450.00
Vanguard US Total Market Shares ETF	1.60M	2.69%	1.79K
Vanguard Total Stock Mkt Idx Inv	1.60M	2.66%	-33.95K
Victory Small Cap Value CIT (Net 75)	1.56M	2.62%	240.00K
Conestoga Small Cap Investors	1.40M	2.34%	140.00K
First Trust RBA Amer Indl RenaisTM ETF	1.28M	2.14%	-3.67K
Victory Sycamore Small Company Opp R	1.25M	2.09%	-52.00K
SPDR® S&P Aerospace & Defense ETF	1.25M	2.09%	5.18K
Vanguard Small Cap Index	1.23M	2.06%	-8.03K
iShares Russell 2000 ETF	1.23M	2.06%	-23.41K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 16, 2025	Munro Douglas	VP, CAO	Sell	$4.92K
Aug 20, 2025	Ratner Steven	EVP, CHRO	Sell	$446.31K
Aug 18, 2025	Munro Douglas	VP, CAO	Sell	$24.15K
Aug 19, 2025	Munro Douglas	VP, CAO	Sell	$24.24K
Aug 18, 2025	Ratner Steven	EVP, CHRO	Sell	$111.81K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	13
2025 Q2	-	7
2025 Q1	-	3
2024 Q4	-	1
2024 Q3	1	10

MRCY Ownership FAQ

Who Owns Mercury Systems?

Mercury Systems shareholders are primarily institutional investors at 110.24%, followed by 1.87% insiders and -12.11% retail investors. The average institutional ownership in Mercury Systems's industry, Defense Stocks, is 62.16%, which Mercury Systems exceeds.

Who owns the most shares of Mercury Systems?

Mercury Systems’s largest shareholders are Blackrock (8.81M shares, 15.27%), Blackrock funding, inc. /de (8.25M shares, 14.00%), and Jana partners management, lp (6.75M shares, 11.46%). Together, they hold 40.73% 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 18.27% of its assets in 6.75M Mercury Systems shares, valued at 363.74M$.

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 5.08% of its total shares outstanding invested in 3.03M Mercury Systems shares.

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