Citadel Advisors
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Citadel Advisors’s iShares MBS ETF MBB Stock Holding History

Citadel Advisors’s Portfolio MBB Stock Details MBB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$959K Buy
+10,100
New +$965K ﹤0.01% 7747
2025
Q4 		– Sell
-77,600
Closed -$7.38M – 13507
2025
Q3 		$7.38M Buy
77,600
+1,100
+1% +$103K ﹤0.01% 3711
2025
Q2 		$7.18M Buy
76,500
+1,500
+2% +$139K ﹤0.01% 3512
2025
Q1 		$7.03M Sell
75,000
-9,000
-11% -$832K ﹤0.01% 3363
2024
Q4 		$7.7M Sell
84,000
-4,600
-5% -$428K ﹤0.01% 3313
2024
Q3 		$8.49M Sell
88,600
-57,600
-39% -$5.44M ﹤0.01% 3164
2024
Q2 		$13.4M Buy
146,200
+19,200
+15% +$1.75M ﹤0.01% 2432
2024
Q1 		$11.7M Sell
127,000
-10,100
-7% -$934K ﹤0.01% 2735
2023
Q4 		$12.9M Buy
137,100
+65,900
+93% +$5.91M ﹤0.01% 2519
2023
Q3 		$6.32M Buy
71,200
+16,800
+31% +$1.54M ﹤0.01% 3302
2023
Q2 		$5.07M Sell
54,400
-6,900
-11% -$649K ﹤0.01% 3620
2023
Q1 		$5.81M Buy
61,300
+25,300
+70% +$2.39M ﹤0.01% 3559
2022
Q4 		$3.34M Buy
36,000
+10,800
+43% +$996K ﹤0.01% 4563
2022
Q3 		$2.31M Sell
25,200
-10,600
-30% -$1.03M ﹤0.01% 5317
2022
Q2 		$3.49M Sell
35,800
-63,400
-64% -$6.22M ﹤0.01% 4481
2022
Q1 		$10.1M Buy
+99,200
New +$10.4M ﹤0.01% 2942
2021
Q3 		– Sell
-4,500
Closed -$487K – 14317
2021
Q2 		$487K Sell
4,500
-4,200
-48% -$455K ﹤0.01% 10115
2021
Q1 		$943K Sell
8,700
-3,800
-30% -$416K ﹤0.01% 8274
2020
Q4 		$1.38M Sell
12,500
-17,400
-58% -$1.92M ﹤0.01% 6112
2020
Q3 		$3.3M Buy
29,900
+21,300
+248% +$2.36M ﹤0.01% 3827
2020
Q2 		$952K Sell
8,600
-10,900
-56% -$1.21M ﹤0.01% 5921
2020
Q1 		$2.15M Buy
+19,500
New +$2.12M ﹤0.01% 4022
2019
Q4 		– Sell
-5,000
Closed -$542K – 9479
2019
Q3 		$542K Buy
+5,000
New +$540K ﹤0.01% 6598

Other funds holding MBB

Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Envestnet Asset Management
Envestnet Asset Management Chicago, Illinois $374B AUM 17.66% 1-Year Est. Return
LPL Financial
LPL Financial San Diego, California $377B AUM 19.32% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
TWIM
TIAA Wealth Investment Management New York $13.1B AUM
Ameriprise
Ameriprise Minneapolis, Minnesota $432B AUM 30.22% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
TCIIS
TIAA-CREF Individual & Institutional Services New York $26B AUM
Truist Financial
Truist Financial Charlotte, North Carolina $74.2B AUM 21.09% 1-Year Est. Return

Citadel Advisors's MBB Position: Q1 2026 in Review

Citadel Advisors opened a new position in iShares MBS ETF (MBB) in Q1 2026: 127,545 shares worth $12.1M. The stake represents ﹤0.01% of the portfolio and ranks #2992 among its holdings. This is a return to the name: Citadel Advisors previously reported a position in MBB as recently as Q4 2024.

Citadel Advisors first reported a position in MBB in Q1 2014 and has held it in 23 quarters since. The position peaked at $557M in Q1 2021. 1,019 funds tracked by Wall St. Rank hold MBB as of Q1 2026.

  • Citadel Advisors held 127,545 shares of iShares MBS ETF worth $12.1M as of Q1 2026.
  • iShares MBS ETF was a new Citadel Advisors position in Q1 2026.
  • iShares MBS ETF made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #2992 holding.
  • Citadel Advisors first reported a position in iShares MBS ETF in Q1 2014 and has held it in 23 quarters since.
  • Citadel Advisors's iShares MBS ETF position peaked at $557M in Q1 2021.
  • 1,019 funds tracked by Wall St. Rank held iShares MBS ETF as of Q1 2026.

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