Jane Street
MBSX

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
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

CP
Castleview Partners Dallas, Texas $228M AUM 19.85% 1-Year Est. Return
AI
Auour Investments Woburn, Massachusetts $349M AUM 13.68% 1-Year Est. Return
CFA
Camarda Financial Advisors Fleming Island, Florida $331M AUM 81.85% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return
DG
Diesslin Group Fort Worth, Texas $259M AUM

Jane Street's MBSX Position: Q2 2026 in Review

Jane Street sold out of Regan Fixed Rate MBS ETF (MBSX) in Q2 2026, closing a stake of 11,599 shares — an estimated $327K sold.

Jane Street first reported a position in MBSX in Q2 2025 and held it in 4 quarters. The position peaked at $429K in Q3 2025. 6 funds tracked by Wall St. Rank hold MBSX as of Q2 2026.

  • Jane Street reported no remaining Regan Fixed Rate MBS ETF position as of Q2 2026 after selling out during the quarter.
  • Jane Street sold 11,599 Regan Fixed Rate MBS ETF shares in Q2 2026, an estimated $327K.
  • Jane Street first reported a position in Regan Fixed Rate MBS ETF in Q2 2025 and held it in 4 quarters.
  • Jane Street's Regan Fixed Rate MBS ETF position peaked at $429K in Q3 2025.
  • 6 funds tracked by Wall St. Rank held Regan Fixed Rate MBS ETF as of Q2 2026.

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