Jane Street’s T-Rex 2X Inverse MSTR Daily Target ETF MSTZ Stock Holding History

Jane Street’s Portfolio MSTZ Stock Details MSTZ Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$854K	Sell	55,000 -4,400	-7%	-$37.1K	﹤0.01%	6860
2026 Q1	$741K	Buy	59,400 +3,000	+5%	+$40.1K	﹤0.01%	7148
2025 Q4	$967K	Sell	56,400 -149,900	-73%	-$1.52M	﹤0.01%	6191
2025 Q3	$1.09M	Buy	206,300 +45,200	+28%	+$203K	﹤0.01%	6148
2025 Q2	$673K	Sell	161,100 -472,550	-75%	-$2.96M	﹤0.01%	6377
2025 Q1	$8.89M	Buy	633,650 +619,615	+4,415%	+$10.9M	﹤0.01%	2148
2024 Q4	$394K	Buy	+14,035	New	+$1.2M	﹤0.01%	7255

Other funds holding MSTZ

HRT Financial New York $54.8B AUM 81.03% 1-Year Est. Return

StoneX Group New York $2.48B AUM 33.54% 1-Year Est. Return

Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return

IMC Chicago Chicago, Illinois $419B AUM 72.04% 1-Year Est. Return

Group One Trading Chicago, Illinois $71.1B AUM 128.96% 1-Year Est. Return

XTX Topco George Town, Cayman Islands $7.72B AUM 32.88% 1-Year Est. Return

TSS

Two Sigma Securities New York $1.16B AUM 36.23% 1-Year Est. Return

Optiver Holding Amsterdam, Netherlands $371B AUM 64.6% 1-Year Est. Return

GTS Securities Miami, Florida $4.75B AUM 41.97% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Jane Street's MSTZ Position: Q2 2026 in Review

Jane Street increased its T-Rex 2X Inverse MSTR Daily Target ETF (MSTZ) stake by 291% in Q2 2026, buying an estimated $479K and bringing the position to 76,335 shares worth $1.19M. The position accounts for ﹤0.01% of the portfolio, ranked #6176.

Jane Street first reported a position in MSTZ in Q3 2024 and has held it in 7 quarters since. The position peaked at $7.1M in Q4 2024. 16 funds tracked by Wall St. Rank hold MSTZ as of Q2 2026.

Jane Street held 76,335 shares of T-Rex 2X Inverse MSTR Daily Target ETF worth $1.19M as of Q2 2026.
Jane Street bought 56,802 T-Rex 2X Inverse MSTR Daily Target ETF shares in Q2 2026, an estimated $479K.
T-Rex 2X Inverse MSTR Daily Target ETF made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #6176 holding.
Jane Street first reported a position in T-Rex 2X Inverse MSTR Daily Target ETF in Q3 2024 and has held it in 7 quarters since.
Jane Street's T-Rex 2X Inverse MSTR Daily Target ETF position peaked at $7.1M in Q4 2024.
16 funds tracked by Wall St. Rank held T-Rex 2X Inverse MSTR Daily Target ETF as of Q2 2026.

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