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Friday, October 2, 2026The Morning Brief →Sign in
MBBISharesINDEX

iShares MBS ETF

$89.55-0.08% vs prior close
909752-WK

Price through Oct 1 · Flows through Sep 30. Figures use the latest available records, not a live quote. Fund details retrieved Oct 1. Holdings snapshot retrieved Oct 1.

he Fund will invest at least 80% of its assets in the component securities of the underlying index and TBAs that have economic characteristics that are substantially identical to the economic characteristics of the component securities of the index, and the fund will invest at least 90% of its assets in fixed income securities of the types included in the underlying index that BFA believes will help the fund track the index.

Price & daily flows
95.393.291.189.55DAILY NET FLOWOct 1Jan 30Jun 1Oct 1

SOURCE: MARKET TAPE & DAILY CREATION/REDEMPTION RECORDS · 3Y SHOWN · NET +$10.4B OVER THIS RANGE

The desk’s read

Money is leaving — −$1.9B in net outflows over the past month, about 5.3% of the fund's asset base, while the price has returned -6.0% so far this year. At 0.040% a year, no lower reported fee appears among the alternatives shown here.

COMPOSED FROM THE FUND’S OWN DAILY RECORDS · UPDATED WITH EACH REFRESH

$36.2Bassets under management
0.040%expense ratio · $4 per $10,000 a year
−$1.9Bnet flow, trailing month
7.2Mavg daily volume, 30 days
10895holdings · US-domiciled
2007listed March 13, 2007 · beta 0.15
The book at a glance
—1.0%—0.8%—0.8%—0.7%—0.6%—0.6%—0.5%—0.5%—0.5%—0.5%—0.5%—0.5%—0.4%—0.4%—0.4%—0.4%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.3%—0.2%—0.2%—0.2%—0.2%—0.2%—0.2%

CELL SIZE IS PORTFOLIO WEIGHT · COLOR IS THE CHANGE IN THE LATEST AVAILABLE SNAPSHOT · TOP 40 POSITIONS

HoldingsDownload CSV
#HoldingWeightPriceDay52-wk
1—GNMA2 30YR TBA(REG C)0.99%———
2—UMBS 30YR TBA(REG A)0.84%———
3—UMBS 30YR TBA(REG A)0.78%———
4—GNMA2 30YR TBA(REG C)0.68%———
5—GNMA2 30YR0.56%———
6—GNMA2 30YR0.55%———
7—GNMA2 30YR0.54%———
8—FNMA 30YR UMBS0.53%———
9—FHLMC 30YR UMBS SUPER0.51%———
10—GNMA2 30YR TBA(REG C)0.46%———
11—GNMA2 30YR0.46%———
12—FNMA 30YR UMBS0.45%———
13—FNMA 30YR UMBS SUPER0.44%———
14—GNMA2 30YR0.42%———
15—GNMA2 30YR0.37%———

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Top 15 positions are open to everyone. Sign in once and every fund’s complete holdings — plus CSV export, watchlists, and flow alerts — unlock across the network.

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Sector weights
Agency Fixed Rate93.82%
Cash and/or Derivatives1.53%
PORTFOLIO COMPOSITION, LATEST DISCLOSURE
Performance
1 week-0.9%
1 month-3.1%
3 months-4.8%
6 months-5.5%
YTD-6.0%
1 year-5.9%
3 years—

PRICE RETURN, DISTRIBUTIONS NOT REINVESTED

Net flows
1 week−$942M
1 month−$1.9B
3 months+$128M
YTD−$393M
1 year−$3.2B

CREATION/REDEMPTION DOLLARS, DAILY RECORDS

Monthly net flows
SepOctNovDecJanFebMarAprMayJulAugSep
DAILY CREATION/REDEMPTION RECORDS, TRAILING TWELVE MONTHS
The risk read
7%realized volatility, 30 days (annualized)
5%realized volatility, 1 year
-7.6%deepest fall from a peak, 1 year
-7.6%latest close versus that peak

The top holding is 1.1% of the book; the top ten carry 7%. Spread across 250+ names, it behaves like roughly 145 equally-weighted positions.

VOLATILITY & DRAWDOWN FROM THE DAILY TAPE · CONCENTRATION FROM THE LATEST DISCLOSED BOOK

Options tape
15Kcalls · latest snapshot
15Kputs · latest snapshot
1.00put/call ratio
9.3Mshares traded
The case against MBB

Due diligence cuts both ways. These funds sit on the same shelf and beat MBB on at least one dimension that matters — the fee, the asset base, or where the money is going.

FundFeeAssetsFlow, 1MThe case
STIP iShares 0-5 Year TIPS Bond ETF0.03%$16.3B+$489M-1bp on fee · +$489M in over the monthHead-to-head
IJH iShares Core S&P Mid-Cap ETF0.05%$122.8B+$2.3B3× the assets · +$2.3B in over the monthHead-to-head
IGSB iShares 1-5 Year Investment Grade Corporate Bond ETF0.04%$23.7B+$575M+$575M in over the monthHead-to-head
IGIB iShares 5-10 Year Investment Grade Corporate Bond ETF0.04%$18.6B+$412M+$412M in over the monthHead-to-head
MUB iShares National Muni Bond ETF0.05%$46B+$2B+$2B in over the monthHead-to-head
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InstrumentsHarvest substitutesTrade cost at $1MClient tearsheetStress this fund
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