Jane Street
MARS

Jane Street’s Roundhill Space & Technology ETF MARS Stock Holding History

Jane Street’s Portfolio MARS Stock Details MARS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$3.12M Buy
96,422
+61,276
+174% +$2.06M ﹤0.01% 4454
2026
Q1 		$899K Buy
+35,146
New +$894K ﹤0.01% 6744

Other funds holding MARS

Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return
OMC
Old Mission Capital Chicago, Illinois $6.31B AUM 20.77% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return
MOS
MGO One Seven Beachwood, Ohio $6.06B AUM 28.9% 1-Year Est. Return
Cambridge Investment Research Advisors
Cambridge Investment Research Advisors Fairfield, Iowa $44.6B AUM 28.94% 1-Year Est. Return
PCM
Prelude Capital Management New York $1.37B AUM 71.68% 1-Year Est. Return
Simplex Trading
Simplex Trading Chicago, Illinois $171B AUM 85% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Group One Trading
Group One Trading Chicago, Illinois $71.1B AUM 128.96% 1-Year Est. Return
Osaic Holdings
Osaic Holdings Scottsdale, Arizona $85.1B AUM 27.35% 1-Year Est. Return

Jane Street's MARS Position: Q2 2026 in Review

Jane Street increased its Roundhill Space & Technology ETF (MARS) stake by 174% in Q2 2026, buying an estimated $2.06M and bringing the position to 96,422 shares worth $3.12M. The position accounts for ﹤0.01% of the portfolio, ranked #4454.

Jane Street first reported a position in MARS in Q1 2026 and has held it in 2 quarters since. 18 funds tracked by Wall St. Rank hold MARS as of Q2 2026.

  • Jane Street held 96,422 shares of Roundhill Space & Technology ETF worth $3.12M as of Q2 2026.
  • Jane Street bought 61,276 Roundhill Space & Technology ETF shares in Q2 2026, an estimated $2.06M.
  • Roundhill Space & Technology ETF made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #4454 holding.
  • Jane Street first reported a position in Roundhill Space & Technology ETF in Q1 2026 and has held it in 2 quarters since.
  • 18 funds tracked by Wall St. Rank held Roundhill Space & Technology ETF as of Q2 2026.

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