Which is cheaper, CORB or IUSB?

IUSB is cheaper, by 0.22 percentage points a year. That is about $22 on $10,000 held for a year. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Across categories

CORB vs IUSB: Differences, Returns & Fees

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CORB's duration was 6.2 years on Aug 31, 2026 and IUSB's 5.5 on Jul 31, 2026; IUSB charges 0.06% to CORB's 0.28%.

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Net assets on Oct 27, 2026: $1.2bn for AB Core Bond ETF and $49.8bn for iShares Core Universal USD Bond ETF.

CORB on its own →IUSB on its own →

At a glance

−1.5%

CORB total return, since launch, Nov 10, 2025

−1.2%

IUSB total return, 1 year

0.28%

CORB expense ratio

0.06%

IUSB expense ratio

Pair scorecard

IUSB costs 0.22 points a year less; IUSB is far larger, $49.8bn against $1.2bn.

CORB vs IUSB: Differences, Returns & Fees
Measure	CORB	IUSB
Return
Measure	CORB	IUSB
Total return, 1 year	not published	−1.2%
Drawdown
Measure	CORB	IUSB
Below its high	3.5%, high on Feb 27, 2026
Benchmark
Measure	CORB	IUSB
What it tracks	No index, actively managed	Bloomberg U.S. Universal Index
Cost and size
Measure	CORB	IUSB
Expense ratio	0.28%	0.06%
Net assets, as of Oct 27, 2026	$1.2bn	$49.8bn
Holdings
Measure	CORB	IUSB
Holdings in common	8%

Holdings in common uses holdings dated Jul 31, 2026 and Aug 31, 2026. Method

What they share

By the books each fund has filed, CORB and IUSB hold 8% of their money in the same securities at the same weight. Holdings dated Jul 31, 2026 and Aug 31, 2026.

50%

0 half 100%

half

8% in common

Positions both hold · largest shared weight first CORB IUSB

U.S. Treasury Notes, due Nov 15, 2033 1.55% 0.29%

U.S. Treasury Notes, due Apr 30, 2028 1.25% 0.29%

U.S. Treasury Notes, due Sep 30, 2030 2.06% 0.28%

U.S. Treasury Notes, due Mar 31, 2031 2.19% 0.28%

U.S. Treasury Notes, due Sep 30, 2031 2.29% 0.21%

U.S. Treasury Notes, due Nov 30, 2028 0.54% 0.21%

U.S. Treasury Notes, due Jun 30, 2029 1.06% 0.20%

U.S. Treasury Notes, due Jun 30, 2028 0.95% 0.19%

U.S. Treasury Notes, due May 15, 2034 0.17% 0.34%

U.S. Treasury Notes, due Oct 31, 2031 2.86% 0.17%

U.S. Treasury Bonds, due Nov 15, 2053 0.59% 0.16%

U.S. Treasury Notes, due Mar 31, 2029 0.55% 0.16%

Only in one fund ↓

Only in CORB

U.S. Treasury Bills, due Nov 19, 2026 2.63%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 2.59%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 2.33%

Ginnie Mae, due Sep 1, 2056 1.91%

Ginnie Mae, due Sep 1, 2054 1.47%

U.S. Treasury Inflation-Indexed Notes, due Jul 15, 2033 1.45%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 1.05%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 1.04%

Only in IUSB

Uniform Mortgage-Backed Securities, due Aug 25, 2056 0.41%

U.S. Treasury Notes, due Dec 31, 2029 0.37%

U.S. Treasury Notes, due May 15, 2036 0.37%

U.S. Treasury Notes, due Feb 15, 2034 0.36%

U.S. Treasury Notes, due Feb 15, 2035 0.35%

U.S. Treasury Notes, due Aug 15, 2035 0.34%

U.S. Treasury Notes, due Nov 15, 2034 0.34%

U.S. Treasury Notes, due May 15, 2035 0.33%

Check overlap with more funds →

Side by side

CORB AB Core Bond ETF IUSB iShares Core Universal USD Bond ETF

Where it sits Bond ETF Bond ETF

Issuer AllianceBernstein iShares

What it is Actively managed Tracks an index of Universal USD Bond

Total return, 1 year −1.5% (since launch, Nov 10, 2025) −1.2%

Its benchmark over the same days −0.7% (AGG) (since launch, Nov 10, 2025) not measured

Gap to its benchmark −0.8 pts vs AGG (since launch, Nov 10, 2025) not measured

Expense ratio 0.28% 0.06%

Holdings 718 18338

Net assets, as of Oct 27, 2026 $1.2bn $49.8bn

CORB and IUSB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

Alert

About each fund

CORB

CORB is actively managed and tracks no index. The prospectus expense ratio is 0.28% a year. It sat 3.5% below its high of Feb 27, 2026 on Oct 28, 2026.

IUSB

IUSB tracks an index of Universal USD Bond. Over the year to Oct 28, 2026 it returned −1.2% with distributions reinvested. The prospectus expense ratio is 0.06% a year.

Questions people ask

Which is cheaper, CORB or IUSB?: IUSB is cheaper, by 0.22 percentage points a year. That is about $22 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

CORB vs JCPB CGCP vs CORB CORB vs EVTR CORB vs PTRB AGG vs IUSB BND vs IUSB EMB vs IUSB BNDX vs IUSB

Where to next

CORB on its own →IUSB on its own →Hold both: look the portfolio through →Rankings →CORB dividend history →CORB holdings →IUSB dividend history →IUSB holdings →Standards and sources →

Sources and dates

CORB filings on SEC EDGAR ↗

CORB prospectus with the expense ratio (SEC) ↗

IUSB filings on SEC EDGAR ↗

IUSB prospectus with the expense ratio (SEC) ↗

iShares page for IUSB ↗

Links are sources, not endorsements. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Cite this pageCitation, APA and Markdown

ETFIQ, CORB against IUSB, data as of Oct 28, 2026. https://etfiq.com/compare/any/corb-vs-iusb

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