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

iShares Core Total USD Bond Market ETF

$45.60+0.39% today
454752-WK

The fund will invest at least 80% of its assets in the component securities of the underlying index and to-be-announced transactions (“TBAs”) that have economic characteristics that are substantially identical to the economic characteristics of the component securities of the underlying index. The index measures the performance of U.S. dollar-denominated taxable bonds that are rated either investment-grade or high yield.

Price & daily flows
46.846.345.845.60DAILY NET FLOWAug 19Dec 16Apr 17Aug 19

SOURCE: MARKET TAPE & DAILY CREATION/REDEMPTION RECORDS · 3Y SHOWN · NET +$21.7B OVER THIS RANGE

The desk’s read

Money keeps arriving — +$808M of net buying over the past month, about 1.9% of the fund's asset base, while the price has returned -2.0% so far this year. At 0.060% 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

$43.4Bassets under management
0.060%expense ratio · $6 per $10,000 a year
+$808Mnet flow, trailing month
3.2Mavg daily volume, 30 days
16170holdings · US-domiciled
2014listed June 9, 2014 · beta 0.12
The book at a glance
0.4%0.4%0.4%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%0.3%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%

CELL SIZE IS PORTFOLIO WEIGHT · COLOR IS TODAY’S MOVE · TOP 40 POSITIONS

HoldingsDownload CSV
#HoldingWeightPriceDay52-wk
1TREASURY NOTE0.37%
2TREASURY NOTE (OLD)0.37%
3TREASURY NOTE0.36%
4TREASURY NOTE0.36%
5TREASURY NOTE0.36%
6TREASURY NOTE0.36%
7TREASURY NOTE0.36%
8TREASURY NOTE (2OLD)0.35%
9TREASURY NOTE0.35%
10TREASURY NOTE0.35%
11TREASURY NOTE0.34%
12TREASURY NOTE0.33%
13TREASURY NOTE (OLD)0.33%
14TREASURY NOTE0.32%
15TREASURY NOTE0.32%

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Sector weights
Treasury39.58%
MBS Pass-Through19.35%
Industrial4.39%
Financial Institutions4.13%
Sovereign2.6%
CMBS1.07%
Supranational1%
Agency0.93%
Cash and/or Derivatives0.78%
Local Authority0.27%
PORTFOLIO COMPOSITION, LATEST DISCLOSURE
Country weights
United States68.34%
Supranational1%
United Kingdom0.48%
Saudi Arabia0.48%
Mexico0.44%
Canada0.33%
Turkey0.28%
Argentina0.24%
PORTFOLIO COMPOSITION, LATEST DISCLOSURE
Performance
1 week+0.3%
1 month-0.4%
3 months-0.2%
6 months-3.0%
YTD-2.0%
1 year
3 years

PRICE RETURN, DISTRIBUTIONS NOT REINVESTED

Net flows
1 week+$199M
1 month+$808M
3 months+$6.9B
YTD+$10B
1 year+$10.4B

CREATION/REDEMPTION DOLLARS, DAILY RECORDS

Monthly net flows
AugSepOctNovDecJanFebMarAprMayJulAug
DAILY CREATION/REDEMPTION RECORDS, TRAILING TWELVE MONTHS
The risk read
4%realized volatility, 30 days (annualized)
4%realized volatility, 1 year
-3.9%deepest fall from a peak, 1 year
-3.4%where it sits vs. that peak today

The top holding is 0.4% of the book; the top ten carry 4%. Spread across 250+ names, it behaves like roughly 210 equally-weighted positions.

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

Options tape
calls today
puts today
put/call ratio
2.6Mshares traded
The case against IUSB

Due diligence cuts both ways. These funds sit on the same shelf and beat IUSB 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-3bp on fee · +$288M in over the monthHead-to-head
MBB iShares MBS ETF0.04%$39B+$26M-2bp on fee · +$26M in over the monthHead-to-head
IGSB iShares 1-5 Year Investment Grade Corporate Bond ETF0.04%$23.4B+$520M-2bp on fee · +$520M in over the monthHead-to-head
IGIB iShares 5-10 Year Investment Grade Corporate Bond ETF0.04%$18.7B+$312M-2bp on fee · +$312M in over the monthHead-to-head
MUB iShares National Muni Bond ETF0.05%$45.8B+$585M-1bp on fee · +$585M in over the monthHead-to-head
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InstrumentsHarvest substitutesTrade cost at $1MClient tearsheetStress this fund
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