Citadel Advisors
MBSX

Citadel Advisors’s Regan Fixed Rate MBS ETF MBSX Stock Holding History

Citadel Advisors’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
Q1 		$433K Sell
15,376
-3,262
-18% -$87.4K ﹤0.01% 9648
2025
Q4 		$492K Buy
+18,638
New +$498K ﹤0.01% 9060
2025
Q3 		– Sell
-48,232
Closed -$1.24M – 14564
2025
Q2 		$1.24M Buy
+48,232
New +$1.22M ﹤0.01% 6632

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 $190M AUM 48.71% 1-Year Est. Return
BWM
BlackDiamond Wealth Management New York $208M AUM 20.68% 1-Year Est. Return
Jane Street
Jane Street New York $777B AUM 61.18% 1-Year Est. Return
DG
Diesslin Group Fort Worth, Texas $259M AUM
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Citadel Advisors's MBSX Position: Q1 2026 in Review

Citadel Advisors reduced its Regan Fixed Rate MBS ETF (MBSX) stake by 18% in Q1 2026, selling an estimated $87.4K and leaving 15,376 shares worth $433K. The position accounts for ﹤0.01% of the portfolio, ranked #9648.

Citadel Advisors first reported a position in MBSX in Q2 2025 and has held it in 3 quarters since. The position peaked at $1.24M in Q2 2025. 8 funds tracked by Wall St. Rank hold MBSX as of Q1 2026.

  • Citadel Advisors held 15,376 shares of Regan Fixed Rate MBS ETF worth $433K as of Q1 2026.
  • Citadel Advisors sold 3,262 Regan Fixed Rate MBS ETF shares in Q1 2026, an estimated $87.4K.
  • Regan Fixed Rate MBS ETF made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #9648 holding.
  • Citadel Advisors first reported a position in Regan Fixed Rate MBS ETF in Q2 2025 and has held it in 3 quarters since.
  • Citadel Advisors's Regan Fixed Rate MBS ETF position peaked at $1.24M in Q2 2025.
  • 8 funds tracked by Wall St. Rank held Regan Fixed Rate MBS ETF as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.