American Capital Management’s Mercury Systems MRCY Stock Holding History

American Capital Management’s Portfolio MRCY Stock Details MRCY Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$59.5M	Buy	+486,064	New	+$46.3M	2.67%	12
2021 Q4	–	Sell	-17,115	Closed	-$812K	–	68
2021 Q3	$812K	Hold	17,115	–	–	0.02%	62
2021 Q2	$1.13M	Buy	17,115 +680	+4%	+$47K	0.03%	62
2021 Q1	$1.16M	Sell	16,435 -25,825	-61%	-$1.87M	0.04%	65
2020 Q4	$3.72M	Buy	42,260 +9,752	+30%	+$741K	0.11%	57
2020 Q3	$2.52M	Buy	32,508 +3,510	+12%	+$266K	0.09%	61
2020 Q2	$2.28M	Buy	28,998 +9,120	+46%	+$747K	0.08%	61
2020 Q1	$1.42M	Buy	+19,878	New	+$1.51M	0.07%	61

Other funds holding MRCY

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

JPM

JANA Partners Management New York $1.9B AUM 18.33% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

CCA

Conestoga Capital Advisors Wayne, Pennsylvania $4.6B AUM 16.08% 1-Year Est. Return

American Capital Management's MRCY Position: Q2 2026 in Review

American Capital Management opened a new position in Mercury Systems (MRCY) in Q2 2026: 486,064 shares worth $59.5M. The stake represents 2.67% of the portfolio and ranks #12 among its holdings. This is a return to the name: American Capital Management previously reported a position in MRCY as recently as Q3 2021.

American Capital Management first reported a position in MRCY in Q1 2020 and has held it in 8 quarters since. 392 funds tracked by Wall St. Rank hold MRCY as of Q2 2026.

American Capital Management held 486,064 shares of Mercury Systems worth $59.5M as of Q2 2026.
Mercury Systems was a new American Capital Management position in Q2 2026.
Mercury Systems made up 2.67% of American Capital Management's portfolio in Q2 2026, its #12 holding.
American Capital Management first reported a position in Mercury Systems in Q1 2020 and has held it in 8 quarters since.
392 funds tracked by Wall St. Rank held Mercury Systems as of Q2 2026.

Based on American Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.