iShares MBS ETF (MBB) Price, Holdings & Fund Facts

Regular session · ET · Market data may be delayed.

About this ETF

The iShares MBS ETF, known by its symbol MBB, is structured to mirror the financial performance of a specific index. This index is made up of premium, mortgage-backed pass-through securities that have been either provided or secured by agencies of the United States government.

Asset class: Fixed income
Issuer: IShares
Domicile: US
Inception date: Mar 13, 2007
Holdings: 10,857
ISIN: US4642885887

Key fund statistics

Assets under management: 35.41B USD
Expense ratio: 0.04%
NAV: $89.28
Volume: 5.39M
Average volume: 3.58M
Prior session close: $89.22

Fund facts updated Oct 9, 2026.

Day range

Current $89.73

$88.99$89.73

52-week range

Current $89.73

$88.58$96.97

Performance

1 month

-3.03%

3 months

-4.23%

Year to date

-5.77%

1 year

-5.68%

3 years

+1.62%

5 years

-16.78%

Since inception

-11.04%

Cumulative price changes exclude distributions and investor-specific taxes, trading costs, and cash flows.

Top holdings

RankHoldingIdentifierWeight

01BLACKROCK CASH CL INST SL AGENCY066922519066922519+4.71%

02USD CASHUSD CASHUSD CASH-3.30%

03FHLMC 30YR UMBS SUPER 2.00% 05/01/20513132DWBP73132DWBP7+1.03%

04GNMA2 30YR TBA(REG C) 6.00% 10/20/202621H0606A421H0606A4+0.68%

05UMBS 30YR TBA(REG A) 5.50% 11/12/202601F0526B301F0526B3+0.59%

06GNMA2 30YR 5.00% 11/20/20543618N5A333618N5A33+0.58%

07GNMA2 30YR TBA(REG C) 5.50% 10/20/202621H0526A121H0526A1+0.57%

08GNMA2 30YR 2.00% 10/20/205136179WP9336179WP93+0.53%

09GNMA2 30YR 2.00% 12/20/205136179WTX636179WTX6+0.52%

10FNMA 30YR UMBS 2.00% 12/01/205131418D7E631418D7E6+0.52%

11GNMA2 30YR 2.50% 07/20/205136179WJR036179WJR0+0.51%

12FHLMC 30YR UMBS SUPER 2.00% 04/01/20513132DWBH53132DWBH5+0.49%

13FNMA 30YR UMBS 2.00% 11/01/205131418D6B331418D6B3+0.44%

14GNMA2 30YR 5.00% 04/20/20563618N6FL63618N6FL6+0.43%

15GNMA2 30YR TBA(REG C) 5.00% 10/20/202621H0506A521H0506A5+0.41%

Showing 15 of 10,846 reported holdings

Holdings data updated Oct 8, 2026.

Exposure

Country exposure

Top 1

United States: 100.00%

Distributions

Ex-dividend dateRecord datePayment dateAmount per share

Oct 1, 2026

Record date: Oct 1, 2026
Payment date: Oct 6, 2026

Oct 1, 2026

Oct 6, 2026

$0.3662

Monthly

Sep 1, 2026

Record date: Sep 1, 2026
Payment date: Sep 4, 2026

Sep 1, 2026

Sep 4, 2026

$0.3388

Monthly

Aug 3, 2026

Record date: Aug 3, 2026
Payment date: Aug 6, 2026

Aug 3, 2026

Aug 6, 2026

$0.3413

Monthly

Jul 1, 2026

Record date: Jul 1, 2026
Payment date: Jul 7, 2026

Jul 1, 2026

Jul 7, 2026

$0.3373

Monthly

Jun 1, 2026

Record date: Jun 1, 2026
Payment date: Jun 4, 2026

Jun 1, 2026

Jun 4, 2026

$0.3334

Monthly

May 1, 2026

Record date: May 1, 2026
Payment date: May 6, 2026

May 1, 2026

May 6, 2026

$0.3347

Monthly

Apr 1, 2026

Record date: Apr 1, 2026
Payment date: Apr 7, 2026

Apr 1, 2026

Apr 7, 2026

$0.333

Monthly

Mar 2, 2026

Record date: Mar 2, 2026
Payment date: Mar 5, 2026

Mar 2, 2026

Mar 5, 2026

$0.3278

Monthly

Feb 2, 2026

Record date: Feb 2, 2026
Payment date: Feb 5, 2026

Feb 2, 2026

Feb 5, 2026

$0.3347

Monthly

Dec 19, 2025

Record date: Dec 19, 2025
Payment date: Dec 24, 2025

Dec 19, 2025

Dec 24, 2025

$0.3341

Monthly

Amounts are shown per share in the ETF trading currency and adjusted for splits when the provider supplies an adjusted value; otherwise the reported amount is used.

MBB news

defenseworld.netOct 5, 2026

Rockland Trust Co. Acquires New Stake in iShares MBS ETF $MBB

Rockland Trust Co. bought a new position in shares of iShares MBS ETF (NASDAQ: MBB) during the third quarter, according to its most recent 13F filing with the Securities and Exchange Commission (SEC). The firm bought…

Read source

defenseworld.netOct 5, 2026

Ferguson Wellman Capital Management Inc. Buys New Holdings in iShares MBS ETF $MBB

Ferguson Wellman Capital Management Inc. acquired a new position in shares of iShares MBS ETF (NASDAQ: MBB) during the undefined quarter, according to the company in its most recent filing with the Securities and…

Read source

defenseworld.netSep 29, 2026

iShares MBS ETF (NASDAQ:MBB) Sees Large Growth in Short Interest

iShares MBS ETF (NASDAQ: MBB - Get Free Report) was the target of a significant growth in short interest during the month of September. As of September 15th, there was short interest totaling 6,572,541 shares, a growth…

Read source

seekingalpha.comSep 19, 2026

MBB: Intermediate Duration Not Suitable At The Head Of Possible Rate Hiking Cycle

The iShares MBS ETF (MBB) faces downside risk due to rising intermediate-term rates and persistent inflation pressures as an intermediate duration FI exposure. Convexity risk and borrower prepayment optionality limit…

Read source

defenseworld.netSep 15, 2026

iShares MBS ETF (NASDAQ:MBB) Reaches New 52-Week Low – Should You Sell?

iShares MBS ETF (NASDAQ: MBB - Get Free Report)'s stock price hit a new 52-week low during trading on Tuesday. The stock traded as low as $91.02 and last traded at $91.22, with a volume of 3067431 shares changing hands.…

Read source

defenseworld.netSep 13, 2026

Corient Private Wealth LP Boosts Stock Position in iShares MBS ETF $MBB

Corient Private Wealth LP raised its position in shares of iShares MBS ETF (NASDAQ: MBB) by 28.3% in the undefined quarter, according to the company in its most recent disclosure with the SEC. The fund owned 786,118…

Read source

Explore more ETFs

Browse all ETFs

VXUS

Vanguard Total International Stock ETF

$84.10

-0.81%

QQQ

Invesco QQQ Trust, Series 1

$747.58

-1.34%

BMOP

BNY Mellon Municipal Opportunities ETF

$23.3191

-0.05%

BND

Vanguard Total Bond Market ETF

$70.22

+0.31%

SPCK

SPAC and New Issue ETF

$21.77

-0.07%

BNDX

Vanguard Total International Bond ETF

$46.93

+0.21%

iShares MBS ETF

About this ETF

Key fund statistics

Continue researching MBB

iShares MBS ETF

About this ETF

Key fund statistics

Performance

Top holdings

Exposure

Country exposure

Distributions

MBB news

Rockland Trust Co. Acquires New Stake in iShares MBS ETF $MBB

Ferguson Wellman Capital Management Inc. Buys New Holdings in iShares MBS ETF $MBB

iShares MBS ETF (NASDAQ:MBB) Sees Large Growth in Short Interest

MBB: Intermediate Duration Not Suitable At The Head Of Possible Rate Hiking Cycle

iShares MBS ETF (NASDAQ:MBB) Reaches New 52-Week Low – Should You Sell?

Corient Private Wealth LP Boosts Stock Position in iShares MBS ETF $MBB

Explore more ETFs

Continue researching MBB

Performance

Top holdings

Exposure

Country exposure

Distributions

MBB news

Rockland Trust Co. Acquires New Stake in iShares MBS ETF $MBB

Ferguson Wellman Capital Management Inc. Buys New Holdings in iShares MBS ETF $MBB

iShares MBS ETF (NASDAQ:MBB) Sees Large Growth in Short Interest

MBB: Intermediate Duration Not Suitable At The Head Of Possible Rate Hiking Cycle

iShares MBS ETF (NASDAQ:MBB) Reaches New 52-Week Low – Should You Sell?

Corient Private Wealth LP Boosts Stock Position in iShares MBS ETF $MBB

Explore more ETFs

iShares MBS ETF

MBB ETF overview

About this ETF

Key fund statistics

Continue researching MBB

iShares MBS ETF

MBB ETF overview

About this ETF

Key fund statistics

Performance

Top holdings

Exposure

Country exposure

Distributions

MBB news

Rockland Trust Co. Acquires New Stake in iShares MBS ETF $MBB

Ferguson Wellman Capital Management Inc. Buys New Holdings in iShares MBS ETF $MBB

iShares MBS ETF (NASDAQ:MBB) Sees Large Growth in Short Interest

MBB: Intermediate Duration Not Suitable At The Head Of Possible Rate Hiking Cycle

iShares MBS ETF (NASDAQ:MBB) Reaches New 52-Week Low – Should You Sell?

Corient Private Wealth LP Boosts Stock Position in iShares MBS ETF $MBB

Explore more ETFs

Continue researching MBB

Performance

Top holdings

Exposure

Country exposure

Distributions

MBB news

Rockland Trust Co. Acquires New Stake in iShares MBS ETF $MBB

Ferguson Wellman Capital Management Inc. Buys New Holdings in iShares MBS ETF $MBB

iShares MBS ETF (NASDAQ:MBB) Sees Large Growth in Short Interest

MBB: Intermediate Duration Not Suitable At The Head Of Possible Rate Hiking Cycle

iShares MBS ETF (NASDAQ:MBB) Reaches New 52-Week Low – Should You Sell?

Corient Private Wealth LP Boosts Stock Position in iShares MBS ETF $MBB

Explore more ETFs