Jane Street
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Jane Street’s Mercury Systems MRCY Stock Holding History

Jane Street’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
Q1 		$941K Buy
12,900
+2,900
+29% +$253K ﹤0.01% 6648
2025
Q4 		$730K Buy
10,000
+3,400
+52% +$253K ﹤0.01% 6859
2025
Q3 		$511K Buy
+6,600
New +$410K ﹤0.01% 7814
2023
Q2 		– Sell
-13,100
Closed -$670K – 9244
2023
Q1 		$670K Buy
+13,100
New +$662K ﹤0.01% 5791
2022
Q4 		– Sell
-11,900
Closed -$483K – 9757
2022
Q3 		$483K Sell
11,900
-6,000
-34% -$314K ﹤0.01% 6752
2022
Q2 		$1.15M Sell
17,900
-47,400
-73% -$2.83M ﹤0.01% 5221
2022
Q1 		$4.21M Buy
65,300
+43,000
+193% +$2.55M ﹤0.01% 3326
2021
Q4 		$1.23M Buy
22,300
+9,900
+80% +$501K ﹤0.01% 5486
2021
Q3 		$588K Sell
12,400
-700
-5% -$38.9K ﹤0.01% 6977
2021
Q2 		$868K Buy
13,100
+1,500
+13% +$104K ﹤0.01% 6133
2021
Q1 		$820K Buy
11,600
+8,600
+287% +$622K ﹤0.01% 5846
2020
Q4 		$264K Sell
3,000
-3,400
-53% -$258K ﹤0.01% 6590
2020
Q3 		$496K Sell
6,400
-2,800
-30% -$212K ﹤0.01% 5166
2020
Q2 		$724K Buy
+9,200
New +$753K ﹤0.01% 4536

Other funds holding MRCY

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
JPM
JANA Partners Management New York $1.67B AUM 1.66% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
CCA
Conestoga Capital Advisors Wayne, Pennsylvania $4.6B AUM 16.08% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Jane Street's MRCY Position: Q4 2025 in Review

Jane Street sold out of Mercury Systems (MRCY) in Q4 2025, closing a stake of 25,641 shares — an estimated $1.91M sold.

Jane Street first reported a position in MRCY in Q3 2014 and held it in 26 quarters. The position peaked at $10.7M in Q2 2020. 346 funds tracked by Wall St. Rank hold MRCY as of Q4 2025.

  • Jane Street reported no remaining Mercury Systems position as of Q4 2025 after selling out during the quarter.
  • Jane Street sold 25,641 Mercury Systems shares in Q4 2025, an estimated $1.91M.
  • Jane Street first reported a position in Mercury Systems in Q3 2014 and held it in 26 quarters.
  • Jane Street's Mercury Systems position peaked at $10.7M in Q2 2020.
  • 346 funds tracked by Wall St. Rank held Mercury Systems as of Q4 2025.

Based on Jane Street's 13F filing for Q4 2025, filed 12 Feb 2026.