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 		$427K Sell
4,500
-15,700
-78% -$1.5M ﹤0.01% 9678
2025
Q4 		$1.92M Buy
20,200
+10,200
+102% +$973K ﹤0.01% 5994
2025
Q3 		$952K Buy
10,000
+4,000
+67% +$376K ﹤0.01% 7640
2025
Q2 		$563K Buy
6,000
+200
+3% +$18.5K ﹤0.01% 8357
2025
Q1 		$544K Sell
5,800
-15,100
-72% -$1.4M ﹤0.01% 8292
2024
Q4 		$1.92M Sell
20,900
-7,300
-26% -$680K ﹤0.01% 5726
2024
Q3 		$2.7M Sell
28,200
-17,500
-38% -$1.65M ﹤0.01% 4975
2024
Q2 		$4.2M Sell
45,700
-6,200
-12% -$565K ﹤0.01% 4022
2024
Q1 		$4.8M Sell
51,900
-124,300
-71% -$11.5M ﹤0.01% 4015
2023
Q4 		$16.6M Sell
176,200
-22,900
-12% -$2.05M ﹤0.01% 2219
2023
Q3 		$17.7M Buy
199,100
+2,000
+1% +$183K ﹤0.01% 1994
2023
Q2 		$18.4M Buy
197,100
+149,600
+315% +$14.1M ﹤0.01% 1975
2023
Q1 		$4.5M Sell
47,500
-58,800
-55% -$5.55M ﹤0.01% 3986
2022
Q4 		$9.86M Buy
106,300
+52,100
+96% +$4.81M ﹤0.01% 2865
2022
Q3 		$4.96M Buy
54,200
+4,700
+9% +$456K ﹤0.01% 3886
2022
Q2 		$4.83M Buy
49,500
+3,700
+8% +$363K ﹤0.01% 3859
2022
Q1 		$4.67M Buy
45,800
+39,000
+574% +$4.07M ﹤0.01% 4307
2021
Q4 		$731K Buy
6,800
+4,800
+240% +$517K ﹤0.01% 8730
2021
Q3 		$216K Sell
2,000
-95,400
-98% -$10.3M ﹤0.01% 11827
2021
Q2 		$10.5M Buy
97,400
+57,600
+145% +$6.24M ﹤0.01% 2988
2021
Q1 		$4.32M Buy
39,800
+9,200
+30% +$1.01M ﹤0.01% 4595
2020
Q4 		$3.37M Sell
30,600
-78,200
-72% -$8.61M ﹤0.01% 4378
2020
Q3 		$12M Buy
108,800
+40,300
+59% +$4.46M ﹤0.01% 2080
2020
Q2 		$7.58M Buy
68,500
+61,200
+838% +$6.78M ﹤0.01% 2553
2020
Q1 		$806K Hold
7,300
– – ﹤0.01% 5695
2019
Q4 		$789K Sell
7,300
-2,900
-28% -$313K ﹤0.01% 6024
2019
Q3 		$1.1M Buy
10,200
+3,100
+44% +$335K ﹤0.01% 5429
2019
Q2 		$764K Buy
+7,100
New +$755K ﹤0.01% 6138
2019
Q1 		– Sell
-4,000
Closed -$419K – 9631
2018
Q4 		$419K Buy
+4,000
New +$411K ﹤0.01% 6684

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.