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
Q2 		$468K Buy
17,152
+1,776
+12% +$47.5K ﹤0.01% 10019
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 $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
DG
Diesslin Group Fort Worth, Texas $259M AUM

Citadel Advisors's MBSX Position: Q2 2026 in Review

Citadel Advisors increased its Regan Fixed Rate MBS ETF (MBSX) stake by 12% in Q2 2026, buying an estimated $47.5K and bringing the position to 17,152 shares worth $468K. The position accounts for ﹤0.01% of the portfolio, ranked #10019.

Citadel Advisors first reported a position in MBSX in Q2 2025 and has held it in 4 quarters since. The position peaked at $1.24M in Q2 2025. 6 funds tracked by Wall St. Rank hold MBSX as of Q2 2026.

  • Citadel Advisors held 17,152 shares of Regan Fixed Rate MBS ETF worth $468K as of Q2 2026.
  • Citadel Advisors bought 1,776 Regan Fixed Rate MBS ETF shares in Q2 2026, an estimated $47.5K.
  • Regan Fixed Rate MBS ETF made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #10019 holding.
  • Citadel Advisors first reported a position in Regan Fixed Rate MBS ETF in Q2 2025 and has held it in 4 quarters since.
  • Citadel Advisors's Regan Fixed Rate MBS ETF position peaked at $1.24M in Q2 2025.
  • 6 funds tracked by Wall St. Rank held Regan Fixed Rate MBS ETF as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.