CORB vs IUSB: Grades, Fees and Holdings Compared

AB Core Bond ETF

CORBBNYSE Arca

iShares Core Universal USD Bond ETF

IUSBANasdaq

Overlap

No data

Expense ratio

IUSB −0.22pt a year

CORB0.28%IUSB0.06%

Avg volume · 30D

IUSB 52.5×the volume

CORB117KIUSB6.13M

CORB vs IUSB Performance

Dec 31, 2025 – Oct 30, 2026

−1.1%CORB−0.4%IUSB

Expense ratio: CORB 0.28%; IUSB 0.06%, better
Fund size: CORB $1.19B; IUSB $50.2B
1Y total return: CORB No data; IUSB 0.0%
Yield (12M): CORB No data; IUSB 4.32%
Holdings: CORB 724; IUSB 18280
Avg volume (30D): CORB 117K sh; IUSB 6.13M sh, better
NAV per share: CORB $28.70; IUSB $44.91
52W range

ETF.net Grade

Pillar letters and Scores for CORB, IUSB, with each pillar’s weight
Pillar	CORB	IUSB
Cost30% weight	B59	A92Higher
Mission25% weight	A100	A100
Risk15% weight	D26	C54Higher
Tradability15% weight	B61	A89Higher
Holdings10% weight	C42	A76Higher
Durability5% weight	C43	A94Higher

Rank among US Aggregate Bond funds

How we build Categories ›

Same Category. CORB and IUSB are both graded against the same 114 US Aggregate Bond funds, so their Grades compare head to head.

US Aggregate Bond⁠

Category · 114 funds

See all 114 ›

IUSB ranks 2nd and CORB 54th of 114 funds in the US Aggregate Bond Category.

Rank 1AAGGiShares Core U.S. Aggregate Bond ETFScore 87
Rank 2AIUSBiShares Core Universal USD Bond ETFScore 86
Rank 2ASCHZSchwab U.S. Aggregate Bond ETFScore 86
Rank 51BVCOBVoya Core Bond ETFScore 63
Rank 54BCORBAB Core Bond ETFScore 62
Rank 54BTOTRT. Rowe Price Total Return ETFScore 62

Our read on each fund

ETF.net Research

CORBBAB Core Bond ETF

IUSBAiShares Core Universal USD Bond ETF

In short

CORB No data

IUSB Most core bond funds stop at investment grade. IUSB keeps going, folding high-yield USD debt into the same wrapper across roughly 18,000 bonds, for 0.06% a year.

Stated mandate

CORB No data

IUSB The Fund seeks to track an index of U.S.-dollar-denominated bonds spanning investment-grade and high-yield sectors.

Why people hold it

CORB No data

IUSB 0.06% a year, a fraction of what the typical broad bond fund in its category charges, and iShares has run it since 2014.
Roughly 18,000 bonds spanning investment-grade and high-yield sectors, so one ticker covers ground a plain Agg tracker leaves on the table.ishares.com
Tracks its index closely, trades heavily, and sits on a multi-billion-dollar asset base. Income is paid monthly.
Among the strongest implementations in a crowded field of nearly 200 core bond funds.

Worth knowing

CORB No data

IUSB That high-yield sleeve is the trade-off: more credit risk than an investment-grade-only fund, and more movement when spreads widen.
BND, SPAB and SCHZ charge 0.03%, half IUSB's fee, but they stay inside investment grade.
Payouts land monthly, but the amount floats with the coupons underneath. Nothing about the income stream is fixed.

Full CORB profile⁠

Full IUSB profile⁠

CORB vs IUSB Holdings

How CORB and IUSB differ

No overlap figure

Two bond funds rarely hold the same issues.

Level by level

Sector22 Sectors0.0%
Countryby domicile89.1%
Asset classFixed Income100%

Sector

Sector weights in CORB and IUSB, widest gap first
Sector	More in CORBMore in IUSB	CORB	IUSB
Treasury	IUSB +40.6 points	0.0%	40.6%
Technology	CORB +37.9 points	37.9%	0.0%
MBS Pass-Through	IUSB +19.6 points	0.0%	19.6%
Industrial	IUSB +18.4 points	0.0%	18.4%
Financials	CORB +11.7 points	11.7%	0.0%
Financial Institutions	IUSB +10.0 points	0.0%	10.0%
Communication	CORB +10.0 points	10.0%	0.0%
Consumer Discretionary	CORB +9.6 points	9.6%	0.0%
Health Care	CORB +9.1 points	9.1%	0.0%
Industrials	CORB +8.4 points	8.4%	0.0%
Consumer Staples	CORB +4.6 points	4.6%	0.0%
Sovereign	IUSB +3.3 points	0.0%	3.3%
Energy	CORB +3.0 points	3.0%	0.0%
Utility	IUSB +2.7 points	0.0%	2.7%
Agency	IUSB +2.3 points	0.0%	2.3%
Utilities	CORB +2.3 points	2.3%	0.0%
Real Estate	CORB +1.9 points	1.9%	0.0%
Materials	CORB +1.7 points	1.7%	0.0%
CMBS	IUSB +1.2 points	0.0%	1.2%
Supranational	IUSB +1.0 points	0.0%	1.0%
Local Authority	IUSB +0.5 points	0.0%	0.5%
ABS	IUSB +0.3 points	0.0%	0.3%

Country, concentration and asset class

Country by domicile

Country weights in CORB and IUSB, widest gap first
Country	More in CORBMore in IUSB	CORB	IUSB
United States	CORB +10.7 points	98.8%	88.1%
Cayman Islands	IUSB +3.1 points	0.0%	3.1%
Canada	IUSB +1.2 points	0.0%	1.2%
Japan	IUSB +0.6 points	0.0%	0.6%
Mexico	IUSB +0.5 points	0.0%	0.5%
Other countries (35)	IUSB +5.3 points	1.2%	6.5%

Concentration

Weight in the 10 largest Holdings

CORB30.3%
IUSB8.1%

Securities held

CORB716
IUSB17,809

Asset class

CORB: Fixed Income
IUSB: Fixed Income

Holdings

Two bond funds rarely hold the same issues, so this page lists no shared Holdings. CORB holds 716 securities, IUSB 17,809.

All 715 CORB holdings⁠All 18,365 IUSB holdings⁠

How we measure overlap

Each holding counts at its smaller weight in the two funds, summed over the full Holdings. Sector, country and asset class use the same rule on each fund’s split. Cash, FX and derivative lines stay out of the counts. Two bond funds get no overlap figure.

CORB vs IUSB Cost

Overpaying CORB vs IUSB

$4,485

On $10,000 over 30 years. 7% growth a year before fees, expense ratio only.

CORB 0.28%
$5,755
IUSB 0.06%
$1,270

Amount$10,000

Years30 years

Cost over time

CORB 0.28%
IUSB 0.06%
Overpaying

Year by year

Year	CORB	IUSB	Overpaying
10	$509	$110	$399
20	$1,976	$432	$1,544
30	$5,755	$1,270	$4,485

Expense ratio

0.28%CORB
0.06%IUSB, cheaper

IUSB0.06%CORB0.28%

0.00%1.04%

Middle half of US Aggregate Bond funds
Median 0.34%

IUSB 10th cheapest of 114 funds

CORB 46th cheapest of 114 funds

CORB vs IUSB Dividends

Last 12 months to Oct 30, 2026

Yield (12M): CORB No data; IUSB 4.32%
Payout (12M): CORB No data; IUSB $1.94
Last payment: CORB $0.09; IUSB $0.15
Ex-dividend: CORB Oct 1, 2026; IUSB Oct 1, 2026
Paid on: CORB Oct 6, 2026; IUSB Oct 6, 2026
Frequency: CORB Monthly; IUSB Monthly

Distribution history

Per share, 2023 to 2026, same scale for both

CORBMonthly · 11 paymentsAll CORB payments⁠

IUSBMonthly · 45 paymentsAll IUSB payments⁠

CORB vs IUSB Risk

Fall from peak · 5 years

This chart needs five years of history for both funds.

Risk facts

VolatilityStd dev, 3 years: CORB No dataIUSB 5.5%
Return per unit of riskSharpe ratio, 3 years: CORB No dataIUSB 0.25
Worst fallMax drawdown, 5 years: CORB No dataIUSB −17.4%
Market sensitivityBeta, 5 years: CORB 0.08IUSB 0.96; Market = 1

CORB and IUSB in the news

All news⁠

ETF Filings
BondBloxx registers a 0.22% core-plus bond ETF, and two funds still not for sale
Oct 21, 2026IUSB

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CORB vs IUSB

In short

Stated mandate

Why people hold it

Worth knowing

How CORB and IUSB differ

Level by level

Sector

Country, concentration and asset class

Country by domicile

Concentration

Asset class

Holdings

Cost over time

Year by year

Distribution history

Fall from peak · 5 years

Risk facts

BondBloxx registers a 0.22% core-plus bond ETF, and two funds still not for sale

How CORB and IUSB differ

Level by level

Sector

Country, concentration and asset class

Country by domicile

Concentration

Asset class

Holdings