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

Optiver Holding’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 Q1	$209K	Sell	16,756 -4,826	-22%	-$64.5K	﹤0.01%	792
2025 Q4	$370K	Sell	21,582 -384,038	-95%	-$3.9M	﹤0.01%	622
2025 Q3	$2.13M	Buy	405,620 +390,297	+2,547%	+$1.75M	﹤0.01%	391
2025 Q2	$64K	Sell	15,323 -98,027	-86%	-$615K	﹤0.01%	587
2025 Q1	$1.59M	Buy	113,350 +76,042	+204%	+$1.33M	﹤0.01%	278
2024 Q4	$1.05M	Buy	+37,308	New	+$3.2M	﹤0.01%	384

Other funds holding MSTZ

Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return

XTX Topco George Town, Cayman Islands $5.75B AUM 30.56% 1-Year Est. Return

Elequin Capital New York $1.19B AUM 16.08% 1-Year Est. Return

StoneX Group New York $1.86B AUM 21.3% 1-Year Est. Return

FTUS

Flow Traders U.S. New York $3.16B AUM 19.52% 1-Year Est. Return

TSS

Two Sigma Securities New York $861M AUM 21.33% 1-Year Est. Return

GTS Securities New York $2.83B AUM 21.76% 1-Year Est. Return

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

Jump Financial Chicago, Illinois $7.5B AUM 33.9% 1-Year Est. Return

Jane Street New York $777B AUM 61.18% 1-Year Est. Return

Optiver Holding's MSTZ Position: Q1 2026 in Review

Optiver Holding reduced its T-Rex 2X Inverse MSTR Daily Target ETF (MSTZ) stake by 22% in Q1 2026, selling an estimated $64.5K and leaving 16,756 shares worth $209K. The position accounts for ﹤0.01% of the portfolio, ranked #792.

Optiver Holding first reported a position in MSTZ in Q4 2024 and has held it in 6 quarters since. The position peaked at $2.13M in Q3 2025. 16 funds tracked by Wall St. Rank hold MSTZ as of Q1 2026.

Optiver Holding held 16,756 shares of T-Rex 2X Inverse MSTR Daily Target ETF worth $209K as of Q1 2026.
Optiver Holding sold 4,826 T-Rex 2X Inverse MSTR Daily Target ETF shares in Q1 2026, an estimated $64.5K.
T-Rex 2X Inverse MSTR Daily Target ETF made up ﹤0.01% of Optiver Holding's portfolio in Q1 2026, its #792 holding.
Optiver Holding first reported a position in T-Rex 2X Inverse MSTR Daily Target ETF in Q4 2024 and has held it in 6 quarters since.
Optiver Holding's T-Rex 2X Inverse MSTR Daily Target ETF position peaked at $2.13M in Q3 2025.
16 funds tracked by Wall St. Rank held T-Rex 2X Inverse MSTR Daily Target ETF as of Q1 2026.

Based on Optiver Holding's 13F filing for Q1 2026, filed 15 May 2026.