Jane Street’s Regan Fixed Rate MBS ETF MBSX Stock Holding History

Jane Street’s Portfolio MBSX Stock Details MBSX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q3	$483K	Buy	+18,901	New	+$510K	﹤0.01%	8095
2026 Q2	–	Sell	-11,599	Closed	-$327K	–	13641
2026 Q1	$327K	Sell	11,599 -1,346	-10%	-$36.1K	﹤0.01%	9042
2025 Q4	$342K	Sell	12,945 -2,625	-17%	-$70.1K	﹤0.01%	8530
2025 Q3	$429K	Buy	15,570 +1,833	+13%	+$48K	﹤0.01%	8184
2025 Q2	$352K	Buy	+13,737	New	+$349K	﹤0.01%	7565

Other funds holding MBSX

Castleview Partners Dallas, Texas $228M AUM 13.32% 1-Year Est. Return

Auour Investments Woburn, Massachusetts $353M AUM 8.66% 1-Year Est. Return

Farther Finance Advisors San Francisco, California $14.2B AUM 18.33% 1-Year Est. Return

Diesslin Group Fort Worth, Texas $256M AUM 11.59% 1-Year Est. Return

JP Morgan Chase New York $1.84T AUM 33.86% 1-Year Est. Return

Jane Street's MBSX Position: Q3 2026 in Review

Jane Street opened a new position in Regan Fixed Rate MBS ETF (MBSX) in Q3 2026: 18,901 shares worth $483K. The stake represents ﹤0.01% of the portfolio and ranks #8095 among its holdings. This is a return to the name: Jane Street previously reported a position in MBSX as recently as Q1 2026.

Jane Street first reported a position in MBSX in Q2 2025 and has held it in 5 quarters since. 6 funds tracked by Wall St. Rank hold MBSX as of Q3 2026.

Jane Street held 18,901 shares of Regan Fixed Rate MBS ETF worth $483K as of Q3 2026.
Regan Fixed Rate MBS ETF was a new Jane Street position in Q3 2026.
Regan Fixed Rate MBS ETF made up ﹤0.01% of Jane Street's portfolio in Q3 2026, its #8095 holding.
Jane Street first reported a position in Regan Fixed Rate MBS ETF in Q2 2025 and has held it in 5 quarters since.
6 funds tracked by Wall St. Rank held Regan Fixed Rate MBS ETF as of Q3 2026.

Based on Jane Street's 13F filing for Q3 2026, filed 12 Nov 2026.