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
Q2 		$1.26M Sell
10,300
-7,200
-41% -$686K ﹤0.01% 6055
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 $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
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Goldman Sachs
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

Jane Street's MRCY Position: Q2 2026 in Review

Jane Street opened a new position in Mercury Systems (MRCY) in Q2 2026: 115,338 shares worth $14.1M. The stake represents ﹤0.01% of the portfolio and ranks #2458 among its holdings. This is a return to the name: Jane Street previously reported a position in MRCY as recently as Q3 2025.

Jane Street first reported a position in MRCY in Q3 2014 and has held it in 27 quarters since. 392 funds tracked by Wall St. Rank hold MRCY as of Q2 2026.

  • Jane Street held 115,338 shares of Mercury Systems worth $14.1M as of Q2 2026.
  • Mercury Systems was a new Jane Street position in Q2 2026.
  • Mercury Systems made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #2458 holding.
  • Jane Street first reported a position in Mercury Systems in Q3 2014 and has held it in 27 quarters since.
  • 392 funds tracked by Wall St. Rank held Mercury Systems as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.