iShares MBS ETF (MBB)


Market Price (9/21/2026): $91.58

iShares MBS ETF (MBB)


Market Price (9/21/2026): $91.58

Key Takeaways

  • MBB has returned -1.7% YTD vs +12.3% for SPY, -1.7% for AGG; -0.3% over the past 12 months (SPY +15.7%, AGG -0.8%). details →
  • Priced in gold, MBB has returned -50.2% over the past 3 years, vs +14.8% in dollars — its dollar gains have lagged gold. details →
  • Over the past month, MBB has seen net inflows of +$654M (+1.7% of assets). details →
  • MBB yields 4.05% based on its trailing 12-month distributions.
  • MBB's -1.7% YTD is in line with its typical pace — it averaged -0.1% at this point (September 20) over the past 5 years. details →
Last updated: 9/20/2026.

Price Chart

Asset Allocation with MBB

Risk Tolerance:
ConservativeModerateAggressive
Moderate — 55% equity / 25% bonds / 20% alternatives
10Y Return (ann.)
+11.7%
Volatility
10.8%
Sharpe
0.81
YTD
+8.5%
Modeled with monthly rebalancing to target weights; 10-year figures are annualized from monthly returns. Illustrative only — past performance is not indicative of future results.

Learn More →
Tailored Asset Allocation
[1] Personalized 5 Level Risk Tolerance Assessment
[2] Asset Allocation for My Risk Tolerance
Learn More →
Protect Wealth
[1] Defensive Portfolios
[2] Tax-Efficient Strategies

Top 20 Holdings for MBB

Total Weights
Top 5: 10.0% | Top 10: 12.7% | Top 20: 16.9%

HoldingETF Weight
066922519BLACKROCK CASH CL INST SL AGENCY6.70%
3132DWBP7FHLMC 30YR UMBS SUPER 2.00% 05/01/20510.97%
01F0526A5UMBS 30YR TBA(REG A) 5.50% 10/13/20260.88%
01F0506A9UMBS 30YR TBA(REG A) 5.00% 10/13/20260.74%
21H0526A1GNMA2 30YR TBA(REG C) 5.50% 10/20/20260.71%
21H0606A4GNMA2 30YR TBA(REG C) 6.00% 10/20/20260.63%
3618N5A33GNMA2 30YR 5.00% 11/20/20540.55%
21H0506A5GNMA2 30YR TBA(REG C) 5.00% 10/20/20260.55%
36179WP93GNMA2 30YR 2.00% 10/20/20510.50%
36179WTX6GNMA2 30YR 2.00% 12/20/20510.49%
31418D7E6FNMA 30YR UMBS 2.00% 12/01/20510.49%
36179WJR0GNMA2 30YR 2.50% 07/20/20510.48%
3132DWBH5FHLMC 30YR UMBS SUPER 2.00% 04/01/20510.47%
21H0426A2GNMA2 30YR TBA(REG C) 4.50% 10/20/20260.44%
31418D6B3FNMA 30YR UMBS 2.00% 11/01/20510.41%
3140XLE46FNMA 30YR UMBS SUPER 2.00% 07/01/20510.40%
3618N6FL6GNMA2 30YR 5.00% 04/20/20560.40%
36179YFL3GNMA2 30YR 5.50% 09/20/20530.37%
3618N5VR7GNMA2 30YR 5.50% 09/20/20550.37%
01F0404A2UMBS 15YR TBA(REG B) 4.00% 10/15/20260.34%

Return vs. Risk

Price Returns Compared

 202120222023202420252026Total [1]
Returns
MBB Return-1%-12%5%1%8%-1%-1%
Peers Return-1%-12%5%3%8%-1%1%
S&P 500 Return27%-19%24%23%16%12%103%

Monthly Win Rates [3]
MBB Win Rate25%25%42%58%83%67% 
Peers Win Rate33%25%42%63%75%59% 
S&P 500 Win Rate75%42%67%75%67%44% 

Max Drawdowns [4]
MBB Max Drawdown-2%-16%-9%-4%-3%-4% 
Peers Max Drawdown-2%-16%-9%-4%-3%-3% 
S&P 500 Max Drawdown-5%-25%-10%-8%-19%-9% 


[1] Cumulative total returns since the beginning of 2021
[2] Peers: VMBS, SPMB, MBS.
[3] Win Rate = % of calendar months in which monthly returns were positive
[4] Max drawdown represents maximum peak-to-trough decline within a year
[5] 2026 data is for the year up to 9/18/2026 (YTD)

Sharpe Ratios Compared

One measure of reward vs. risk is a Sharpe ratio. A higher ratio indicates better risk-adjusted returns. Most funds have Sharpe ratios < 1.0.

Ticker1Y3Y5Y
MBB-0.280.07-0.48
Bond Top Results (3Y)   
USHY0.210.840.08
SHYG0.220.790.22
JNK0.230.750.01
HYG0.090.750.02
SPSB-0.810.54-0.46

Results as of 8312026.

How Low Can It Go

EventMBBS&P 500
2022 Inflation Shock & Fed Tightening
  % Loss-15.9%-24.5%
  % Gain to Breakeven18.9%32.4%
  Time to Breakeven1047 days427 days

Compare to VMBS, SPMB, MBS

In The Past

iShares MBS ETF's stock fell 0.0% during the 2025 US Tariff Shock. Such a loss loss requires a 0.0% gain to breakeven.

Preserve Wealth

Limiting losses and compounding gains is essential to preserving wealth.

Asset Allocation

Actively managed asset allocation strategies protect wealth. Learn more.

null

Compare to VMBS, SPMB, MBS

In The Past

iShares MBS ETF's stock fell 0.0% during the 2025 US Tariff Shock. Such a loss loss requires a 0.0% gain to breakeven.

Preserve Wealth

Limiting losses and compounding gains is essential to preserving wealth.

Asset Allocation

Actively managed asset allocation strategies protect wealth. Learn more.

MBB Dip Buy History


Get Notified
Alerts when dip buy opportunities arise.
Notify Me →

Current Dip Buy Opportunities Across ETFs

ETFs currently down 5% or more from trailing 6M peaks.

TickerNameDip %Mkt PricePrice DatePeak PricePeak Date# Days
QQEWFirst Trust Nasdaq-100 Select Equal Weight ETF-5.6%157.729202026167.03813202638
IJHiShares Core S&P Mid-Cap ETF-7.2%72.98920202678.67816202635
VOVanguard Mid-Cap ETF-5.3%80.00920202684.46816202635
IWRiShares Russell Mid-Cap ETF-5.8%108.219202026114.82816202635
MDYState Street SPDR S&P MIDCAP 400 ETF Trust-7.0%666.689202026716.91816202635
SCHMSchwab U.S. Mid-Cap ETF-5.5%34.85920202636.87630202682
IVOOVanguard S&P Mid-Cap 400 ETF-6.9%123.969202026133.08816202635
IJRiShares Core S&P Small-Cap ETF-7.7%138.909202026150.44816202635
VBVanguard Small-Cap ETF-6.4%289.619202026309.29816202635
IWMiShares Russell 2000 ETF-6.9%284.109202026305.09816202635
SCHASchwab U.S. Small-Cap ETF-7.4%33.44920202636.13630202682
VTWOVanguard Russell 2000 ETF-6.6%115.169202026123.31816202635
DFASDimensional U.S. Small Cap ETF-6.4%79.11920202684.48816202635
ESMLiShares ESG Aware MSCI USA Small-Cap ETF-6.5%52.95920202656.64816202635
NUSCNuveen ESG Small-Cap ETF-6.9%49.57920202653.27816202635
AKREAkre Focus ETF-10.0%55.69920202661.85830202621
IWPiShares Russell Mid-Cap Growth ETF-7.2%137.089202026147.70817202634
VOTVanguard Mid-Cap Growth ETF-6.9%292.259202026314.02816202635
IJKiShares S&P Mid-Cap 400 Growth ETF-7.8%109.819202026119.11817202634
MDYGState Street SPDR S&P 400 Mid Cap Growth ETF-7.7%104.949202026113.69817202634
IWOiShares Russell 2000 Growth ETF-8.5%362.099202026395.65816202635
VBKVanguard Small-Cap Growth ETF-7.6%338.369202026366.24817202634
IJTiShares S&P Small-Cap 600 Growth ETF-9.0%163.019202026179.07804202647
SLYGState Street SPDR S&P 600 Small Cap Growth ETF-8.7%109.089202026119.50804202647
IWSiShares Russell Mid-Cap Value ETF-5.3%164.189202026173.44816202635
IJJiShares S&P Mid-Cap 400 Value ETF-6.7%141.529202026151.67816202635
MDYVState Street SPDR S&P 400 Mid Cap Value ETF-6.2%91.40920202697.39816202635
VBRVanguard Small-Cap Value ETF-5.5%237.749202026251.66816202635
AVUVAvantis U.S. Small Cap Value ETF-5.3%121.969202026128.74804202647
IWNiShares Russell 2000 Value ETF-5.2%215.589202026227.43816202635
IJSiShares S&P Small-Cap 600 Value ETF-6.6%131.359202026140.68816202635
SLYVState Street SPDR S&P 600 Small Cap Value ETF-6.2%105.249202026112.22816202635
VIOVVanguard S&P Small-Cap 600 Value ETF-6.3%113.139202026120.76816202635
VGKVanguard FTSE Europe ETF-5.1%88.21920202692.96825202626
IEMGiShares Core MSCI Emerging Markets ETF-5.0%81.66920202686.00622202690
EEMiShares MSCI Emerging Markets ETF-5.9%67.03920202671.21622202690
ASHRXtrackers Harvest CSI 300 China A-Shares ETF-9.5%33.77920202637.30622202690
EWYiShares MSCI South Korea ETF-17.3%181.319202026219.20621202691
EWZiShares MSCI Brazil ETF-10.1%37.52920202641.734142026159
FXIiShares China Large-Cap ETF-10.3%34.32920202638.265132026130
ILFiShares Latin America 40 ETF-8.0%35.04920202638.104142026159
KWEBKraneShares CSI China Internet ETF-18.8%24.83920202630.595132026130
SDYState Street SPDR S&P Dividend ETF-5.3%150.789202026159.18824202627
NOBLProShares S&P 500 Dividend Aristocrats ETF-5.8%55.66920202659.07824202627
MTUMiShares MSCI USA Momentum Factor ETF-10.3%309.629202026345.22622202690
SPHQInvesco S&P 500 Quality ETF-6.8%83.93920202690.10630202682
FNDASchwab Fundamental U.S. Small Company ETF-7.1%35.79920202638.52816202635
SPMOInvesco S&P 500 Momentum ETF-7.7%149.219202026161.66622202690
URAGlobal X Uranium ETF-28.5%41.65920202658.265062026137
BOTZGlobal X Funds Global X Robotics & Artificial Intelligence ETF-15.7%35.11920202641.635132026130
ROBOROBO Global Robotics & Automation Index ETF-13.1%78.50920202690.346022026110
LITGlobal X Lithium & Battery Tech ETF-23.1%70.50920202691.625112026132
ICLNiShares Global Clean Energy ETF-26.1%17.56920202623.756022026110
ARKQARK Autonomous Technology & Robotics ETF-15.0%122.209202026143.825282026115
ARKXARK Space & Defense Innovation ETF-14.9%32.12920202637.745282026115
NASATema Space Innovators ETF-42.9%23.94920202641.895272026116
AGIXKraneShares Artificial Intelligence ETF-5.8%46.55920202649.406012026111
DRSKAptus Defined Risk ETF-6.3%27.81920202629.676012026111
YYYAmplify CEF High Income ETF-6.3%10.83920202611.56712202670
GDEWisdomTree Efficient Gold Plus Equity Strategy Fund-6.3%66.78920202671.30825202626
XLIState Street Industrial Select Sector SPDR ETF-9.0%169.759202026186.51816202635
XLCState Street Communication Services Select Sector SPDR ETF-7.0%110.819202026119.104192026154
XLYState Street Consumer Discretionary Select Sector SPDR ETF-9.0%111.039202026122.065282026115
XLPState Street Consumer Staples Select Sector SPDR ETF-5.3%82.80920202687.45824202627
XLUState Street Utilities Select Sector SPDR ETF-12.8%41.10920202647.154092026164
XLBState Street Materials Select Sector SPDR ETF-6.9%49.99920202653.67826202625
IYJiShares U.S. Industrials ETF-8.3%155.729202026169.86804202647
IYMiShares U.S. Basic Materials ETF-7.2%182.379202026196.45825202626
SMHVanEck Semiconductor ETF-14.3%573.009202026668.91622202690
SOXXiShares Semiconductor ETF-18.6%533.079202026655.01622202690
IBBiShares Biotechnology ETF-5.7%204.569202026216.96819202632
XBIState Street SPDR S&P Biotech ETF-7.6%156.729202026169.55819202632
ITAiShares U.S. Aerospace & Defense ETF-15.6%213.849202026253.22816202635
IGViShares Expanded Tech-Software Sector ETF-5.4%104.359202026110.32827202624
IYTiShares U.S. Transportation ETF-10.8%80.27920202690.01716202666
IAIiShares U.S. Broker-Dealers & Securities Exchanges ETF-6.7%184.809202026198.06903202617
KREState Street SPDR S&P Regional Banking ETF-6.6%72.75920202677.93816202635
MISLFirst Trust Indxx Aerospace & Defense ETF-13.8%42.38920202649.195282026115
RINGiShares MSCI Global Gold Miners ETF-9.7%84.09920202693.17825202626
SOXQInvesco PHLX Semiconductor ETF-18.5%93.869202026115.11622202690
TLTiShares 20+ Year Treasury Bond ETF-6.4%81.25920202686.78629202683
VGLTVanguard Long-Term Treasury ETF-5.5%52.07920202655.12629202683
SPTLState Street SPDR Portfolio Long Term Treasury ETF-5.9%24.77920202626.33629202683
TLHiShares 10-20 Year Treasury Bond ETF-5.4%95.169202026100.56629202683
EDVVanguard World Funds Extended Duration ETF-8.9%59.63920202665.43624202688
SPLBState Street SPDR Portfolio Long Term Corporate Bond ETF-5.4%21.19920202622.40629202683
IGLBiShares 10+ Year Investment Grade Corporate Bond ETF-5.2%47.44920202650.05629202683
LMUBiShares Long-Term National Muni Bond ETF-6.5%47.67920202651.00705202677
GSGiShares GSCI Commodity-5.4%30.01920202631.723222026182
GLDSPDR Gold Trust-10.0%401.179202026445.934192026154
IAUiShares Gold Trust-10.0%82.23920202691.344192026154
GLDMSPDR Gold MiniShares Trust-9.8%86.59920202696.044192026154
SLViShares Silver Trust-24.5%59.93920202679.355132026130
PPLTETFS Physical Platinum Shares-16.6%16.31920202619.555132026130
PALLETFS Physical Palladium Shares-18.0%23.69920202628.894142026159
UNGUnited States Natural Gas Fund LP-16.0%10.41920202612.393222026182
BNOUnited States Brent Oil Fund LP ETV-7.1%55.85920202660.135042026139
VNQVanguard Real Estate ETF-8.0%92.919202026100.95728202654
XLREState Street Real Estate Select Sector SPDR ETF-7.6%42.53920202646.01728202654
SCHHSchwab U.S. REIT ETF-8.5%22.74920202624.86726202656
IYRiShares U.S. Real Estate ETF-8.6%98.009202026107.26728202654
REETiShares Global REIT ETF-9.2%26.22920202628.89726202656
USRTiShares Core U.S. REIT ETF-10.1%62.80920202669.82726202656

ETF Fund Flows

Largest fund inflows and outflows across ETFs, with the asset-allocation rotation they imply.

Net fund flows · as of 2026-09-18

Asset allocation rotation · Past month

  • Equity ETFs drew the largest net inflows (+$34.5B), followed by Bond (+$13.2B), while Real Estate (−$278M) saw the largest outflows.
  • Within the mix, money rotated into US Total Market (+$10.0B) and out of US Large Cap Core (−$11.7B).
  • Relative to fund size, CNEQ drew the largest inflow (+48.1% of AUM) and XOVR the largest outflow (−27.5%).
Largest inflows
#TickerNameTypeNet flow% of AUM
1VOOVanguard S&P 500 ETFEquity US Large Cap Core+$53.06B+5.0%
2VTIVanguard Morningstar Total Stock Market ETFEquity US Total Market+$9.94B+1.4%
3SPMOInvesco S&P 500 Momentum ETFEquity Factor Smart Beta+$6.94B+31.2%
4SGOViShares 0-3 Month Treasury Bond ETFCash+$6.43B+6.0%
5VUGVanguard Morningstar Growth ETFEquity US Large Growth+$4.56B+2.0%
6VGSHVanguard Short-Term Treasury ETFBond Short Treasury+$4.38B+12.6%
7VOVanguard Morningstar Mid-Cap ETFEquity US Mid Cap Core+$4.22B+3.9%
8VFLOVictoryShares Free Cash Flow ETFOther+$3.58B+32.4%
9SOXXiShares Semiconductor ETFEquity Industry Subsector+$3.18B+7.5%
10SCHDSchwab U.S. Dividend Equity ETFEquity Dividend Income+$3.09B+2.8%
Largest outflows
#TickerNameTypeNet flow% of AUM
1IVViShares Core S&P 500 ETFEquity US Large Cap Core-$43.24B-5.0%
2SPYState Street SPDR S&P 500 ETFEquity US Large Cap Core-$24.87B-3.1%
3QQQInvesco QQQ Trust, Series 1Equity US Nasdaq Growth-$6.68B-1.4%
4LQDiShares iBoxx $ Investment Grade Corporate Bond ETFBond Intermediate Corporate-$4.83B-16.2%
5XLFState Street Financial Select Sector SPDR ETFEquity Broad Sector-$2.99B-5.5%
6VGITVanguard Intermediate-Term Treasury ETFBond Intermediate Treasury-$2.75B-6.9%
7DRAMRoundhill Memory ETFOther-$2.3B-8.9%
8GOVTiShares U.S. Treasury Bond ETFBond Intermediate Treasury-$2.22B-5.3%
9EWYiShares MSCI South Korea ETFEquity Emerging Markets-$1.97B-7.2%
10IWMiShares Russell 2000 ETFEquity US Small Cap Core-$1.73B-2.2%

Largest ETF fund flows across ~2632 funds (min AUM $100M). Net creations/redemptions; leveraged & inverse ETFs excluded. A ⚠ marks a day excluded as a suspected data error.

Set Alerts and Notifications

Stay Informed

Trade & Investment Ideas

Wealth

Alert Me Periodically

Inform Me Once

About MBB

0Holdings Count: 11213
Expense Ratio: 0.04%
Inception Date: 2007-03-12
iShares MBS 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 | ETF Website

Recent Active Movers

Peer Comparisons

Peers to compare with:

Profile

MBBVMBSSPMBMBSMedian
NameiShares MB.Vanguard M.State Stre.Angel Oak . 
Asset ClassBondBondBondBond-
AUM ($ Bil)38.917.37.00.212.2
Expense Ratio0.04%0.03%0.04%0.79%0.04%
10-D Avg Volume (Mil)2.261.361.210.131.29
Latest Day Volume (Mil)2.530.700.520.000.61
Holdings Count11,2093442,7641401,554
Inception Date3/12/200711/19/20091/15/20092/16/2024-

Fundamentals

MBBVMBSSPMBMBSMedian
NameiShares MB.Vanguard M.State Stre.Angel Oak . 
Net Asset Value91.3745.2421.608.39-
Premium/Discount-0.1%0.0%-0.1%-0.1%-0.1%
Distribution Yield4.4%4.3%4.2%5.7%4.4%
Sales Yield-----
Earnings Yield-----

Valuation

MBBVMBSSPMBMBSMedian
NameiShares MB.Vanguard M.State Stre.Angel Oak . 
P/S (TTM)-----
P/E (TTM)-----
P/FCF (TTM)-----
Forward P/E-----
Forward P/S-----

Risk

MBBVMBSSPMBMBSMedian
NameiShares MB.Vanguard M.State Stre.Angel Oak . 
Volatility (1Y)4.5%4.4%4.3%3.1%4.3%
Volatility (3Y)6.1%6.0%6.0%4.0%6.0%
Volatility (5Y)6.9%6.8%6.8%4.0%6.8%
Beta (1Y)0.140.130.130.060.13
Beta (3Y)0.080.080.080.020.08
Beta (5Y)0.090.090.090.020.09
Sharpe Ratio (1Y)-0.110.04-0.100.17-0.03
Sharpe Ratio (3Y)0.690.740.691.220.72
Sharpe Ratio (5Y)-0.000.04-0.001.220.02
Max Drawdown (1Y)-3.9%-3.1%-3.9%-3.3%-3.6%
Max Drawdown (3Y)-5.4%-5.5%-5.5%-4.1%-5.5%
Max Drawdown (5Y)-17.1%-16.8%-17.3%-4.1%-17.0%

Returns

MBBVMBSSPMBMBSMedian
NameiShares MB.Vanguard M.State Stre.Angel Oak . 
1M Return-2.4%-2.1%-2.3%-2.3%-2.3%
3M Return-2.7%-2.1%-2.6%-1.9%-2.4%
6M Return-2.3%-1.6%-2.1%-2.1%-2.1%
YTD Return-1.7%-1.2%-1.6%-1.1%-1.4%
1Y Return-0.5%0.1%-0.5%0.5%-0.2%
2Y Return2.5%3.7%2.5%4.0%3.1%
3Y Return12.9%13.9%12.9%-12.9%

Short Interest

Short Interest: As Of Date8312026
Short Interest: Shares Quantity3.3 Mil
Short Interest: % Change Since 815202669.6%
Average Daily Volume3.8 Mil
Days-to-Cover Short Interest1