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Wednesday, August 19, 2026The Morning Brief →Sign in
MBBISharesINDEX

iShares MBS ETF

$93.52+0.47% today
939752-WK

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
96.094.893.693.52DAILY NET FLOWFeb 17Apr 17Jun 17Aug 19

SOURCE: MARKET TAPE & DAILY CREATION/REDEMPTION RECORDS · 6M SHOWN · NET +$765M OVER THIS RANGE

The desk’s read

Money keeps arriving — +$26M of net buying over the past month, while the price has returned -1.7% so far this year. At 0.040% a year it is not the cheapest way in — AGG runs the same ground at 0.03%.

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

$39Bassets under management
0.040%expense ratio · $4 per $10,000 a year
+$26Mnet flow, trailing month
2.1Mavg daily volume, 30 days
10895holdings · US-domiciled
2007listed March 12, 2007 · beta 0.14
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 TODAY’S MOVE · TOP 40 POSITIONS

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

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Sector weights
Agency Fixed Rate93.82%
Cash and/or Derivatives1.53%
PORTFOLIO COMPOSITION, LATEST DISCLOSURE
Performance
1 week+0.4%
1 month-0.3%
3 months+0.0%
6 months-3.1%
YTD-1.7%
1 year
3 years

PRICE RETURN, DISTRIBUTIONS NOT REINVESTED

Net flows
1 week+$1
1 month+$26M
3 months+$1.4B
YTD+$871M
1 year−$1B

CREATION/REDEMPTION DOLLARS, DAILY RECORDS

Monthly net flows
AugSepOctNovDecJanFebMarAprMayJulAug
DAILY CREATION/REDEMPTION RECORDS, TRAILING TWELVE MONTHS
The risk read
5%realized volatility, 30 days (annualized)
5%realized volatility, 1 year
-4.3%deepest fall from a peak, 1 year
-3.5%where it sits vs. that peak today

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
calls today
2puts today
put/call ratio
2.2Mshares 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%$16B+$288M-1bp on fee · +$288M in over the monthHead-to-head
IGSB iShares 1-5 Year Investment Grade Corporate Bond ETF0.04%$23.4B+$520M+$520M in over the monthHead-to-head
IGIB iShares 5-10 Year Investment Grade Corporate Bond ETF0.04%$18.7B+$312M+$312M in over the monthHead-to-head
MUB iShares National Muni Bond ETF0.05%$45.8B+$585M+$585M in over the monthHead-to-head
GOVT iShares U.S. Treasury Bond ETF0.05%$43.8B+$304M+$304M in over the monthHead-to-head
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InstrumentsHarvest substitutesTrade cost at $1MClient tearsheetStress this fund
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