Jeff Yass’s Defiance Leveraged Long Income MSTR ETF MST Stock Holding History

Jeff Yass’s Portfolio MST Stock Details MST Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$282K	Buy	+39,183	New	+$929K	﹤0.01%	11188
2026 Q1	–	Sell	-10,933	Closed	-$448K	–	14471
2025 Q4	$448K	Buy	10,933 +9,132	+507%	+$1.1M	﹤0.01%	9057
2025 Q3	$448K	Buy	1,801 +205	+13%	+$79.5K	﹤0.01%	9210
2025 Q2	$854K	Buy	+1,596	New	+$865K	﹤0.01%	7842

Other funds holding MST

OMC

Old Mission Capital Chicago, Illinois $6.31B AUM 20.77% 1-Year Est. Return

Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

Simplex Trading Chicago, Illinois $171B AUM 85% 1-Year Est. Return

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

KFAS

Keating Financial Advisory Services Manhattan, Kansas $760M AUM

Jeff Yass's MST Position: Q2 2026 in Review

Jeff Yass opened a new position in Defiance Leveraged Long Income MSTR ETF (MST) in Q2 2026: 39,183 shares worth $282K. The stake represents ﹤0.01% of the portfolio and ranks #11188 among its holdings. This is a return to the name: Jeff Yass previously reported a position in MST as recently as Q4 2025.

Jeff Yass first reported a position in MST in Q2 2025 and has held it in 4 quarters since. The position peaked at $854K in Q2 2025. 6 funds tracked by Wall St. Rank hold MST as of Q2 2026.

Jeff Yass held 39,183 shares of Defiance Leveraged Long Income MSTR ETF worth $282K as of Q2 2026.
Defiance Leveraged Long Income MSTR ETF was a new Jeff Yass position in Q2 2026.
Defiance Leveraged Long Income MSTR ETF made up ﹤0.01% of Jeff Yass's portfolio in Q2 2026, its #11188 holding.
Jeff Yass first reported a position in Defiance Leveraged Long Income MSTR ETF in Q2 2025 and has held it in 4 quarters since.
Jeff Yass's Defiance Leveraged Long Income MSTR ETF position peaked at $854K in Q2 2025.
6 funds tracked by Wall St. Rank held Defiance Leveraged Long Income MSTR ETF as of Q2 2026.

Based on Susquehanna International Group's 13F filing for Q2 2026, filed 14 Aug 2026.