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 		$1.28M Buy
17,500
+3,400
+24% +$296K ﹤0.01% 5987
2025
Q4 		$1.03M Buy
14,100
+4,600
+48% +$342K ﹤0.01% 6057
2025
Q3 		$735K Buy
9,500
+1,600
+20% +$99.5K ﹤0.01% 6982
2025
Q2 		$425K Buy
+7,900
New +$385K ﹤0.01% 7233
2025
Q1 		– Sell
-4,900
Closed -$206K – 10177
2024
Q4 		$206K Sell
4,900
-2,400
-33% -$91.5K ﹤0.01% 8369
2024
Q3 		$270K Buy
+7,300
New +$257K ﹤0.01% 8198
2023
Q2 		– Sell
-7,600
Closed -$389K – 9243
2023
Q1 		$389K Sell
7,600
-400
-5% -$20.2K ﹤0.01% 6760
2022
Q4 		$358K Buy
+8,000
New +$378K ﹤0.01% 6715
2022
Q2 		– Sell
-6,200
Closed -$400K – 10429
2022
Q1 		$400K Sell
6,200
-2,200
-26% -$131K ﹤0.01% 7890
2021
Q4 		$463K Sell
8,400
-32,700
-80% -$1.66M ﹤0.01% 7420
2021
Q3 		$1.95M Sell
41,100
-4,200
-9% -$233K ﹤0.01% 4530
2021
Q2 		$3M Buy
45,300
+40,300
+806% +$2.79M ﹤0.01% 3571
2021
Q1 		$353K Sell
5,000
-1,900
-28% -$137K ﹤0.01% 7432
2020
Q4 		$608K Buy
6,900
+3,200
+86% +$243K ﹤0.01% 5445
2020
Q3 		$287K Sell
3,700
-5,300
-59% -$402K ﹤0.01% 5933
2020
Q2 		$708K Buy
+9,000
New +$737K ﹤0.01% 4567

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.