IUSBvsGCORETF Comparison
VS
iShares Core Total USD Bond Market ETF (IUSB) and Goldman Sachs Access U.S. Aggregate Bond ETF (GCOR) belong to the same industry segment: US Aggregate Bonds. Both ETFs have the same top 3 sector exposures: Sovereign, Finance and Industrials. IUSB is less expensive with a Total Expense Ratio (TER) of 0.06%, versus 0.09% for GCOR. IUSB is down -1.23% year-to-date (YTD) with +$10.90B in YTD flows. GCOR performs worse with -1.63% YTD performance, and +$140M in YTD flows. Run a side-by-side ETF comparison of IUSB and GCOR below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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IUSB vs GCOR performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/16/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | IUSB GCOR | -1.14%-1.22% | -2.08%-2.32% | -1.23%-1.63% | -0.61%-1.17% | +13.91%+11.52% | -0.93%-4.43% |
| Flows | IUSB GCOR | +$1.01B+$16M | +$2.74B+$32M | +$10.90B+$140M | +$11.03B+$196M | +$22.36B+$338M | +$32.02B+$676M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | IUSB GCOR | +3.63%+3.80% | +3.45%+3.59% | +4.72%+5.00% | +5.53%+5.96% |
| Max drawdown | IUSB GCOR | -2.42%-2.67% | -2.91%-3.40% | -4.33%-5.11% | -17.80%-18.45% |
| Max drawdown duration | IUSB GCOR | 79d79d | 199d199d | 280d318d | 1484d1820d |
Trading data
IUSB | GCOR | |
Last sale 9/17/2026 at 4:40 PM | $44.89 | $39.98 |
| Previous close 09/16/2026 | $44.71 | $39.84 |
| Consolidated volume 09/16/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of August 31, 2026
1-year trailing difference
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IUSB | GCOR | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/17/2026 at 4:40 PM
Live
Closed
IUSB | GCOR | |
|---|---|---|
| Last price | $44.89 | $39.98 |
| 1D performance | +0.40% | +0.35% |
| AuM | $43.68 B | $809.93 M |
| E/R | 0.06% | 0.09% |
Characteristics
IUSB | GCOR | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | iShares | Goldman Sachs |
| Benchmark | Bloomberg U.S. Universal Index | FTSE Goldman Sachs US Broad Bond Market Index |
| N° of holdings | 16285 | 1637 |
| Asset class | Bonds | Fixed Income |
| Trailing 12m distribution yield | Join | Join |
| Inception date | June 10, 2014 | September 8, 2020 |
| ESG | No | No |
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Exposure
Countries
IUSB
USA
73.5%
Other
26.5%
GCOR
USA
66.03%
Other
33.97%
Sectors
IUSB
Sovereign
43.13%
Finance
13.46%
Other
43.41%
GCOR
Sovereign
43.99%
Finance
8.24%
Other
47.77%
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Diversification
IUSB
Total weight of top 15 holdings out of 15
9.25%
GCOR
Total weight of top 15 holdings out of 15
25.19%
Top 15 holdings
Data as of July 31, 2026
IUSB
BlackRock Liquidity TempCash
4.35%
US01F0206874
0.42%
USA, Notes 4.375% 31dec2029, USD (AH-2029)
0.38%
USA, Notes 4.375% 15may2036, USD (C-2036)
0.37%
USA, Notes 4% 15feb2034, USD (B-2034)
0.37%
USA, Notes 4.625% 15feb2035, USD (B-2035)
0.35%
USA, Notes 4.25% 15aug2035, USD (E-2035)
0.35%
USA, Notes 4.375% 15may2034, USD (C-2034)
0.34%
USA, Notes 4.25% 15nov2034, USD (F-2034)
0.34%
USA, Notes 4.125% 15feb2036, USD (B-2036)
0.34%
USA, Notes 3.875% 15aug2034, USD (E-2034)
0.34%
USA, Notes 4.25% 15may2035, USD (C-2035)
0.33%
USA, Notes 2.75% 15aug2032, USD (E-2032)
0.33%
USA, Notes 4% 15nov2035, USD (F-2035)
0.33%
US01F0426811
0.31%
GCOR
USA, Notes 3.875% 30nov2029, USD (S-2029)
4.82%
USA, Notes 0.75% 31jan2028, USD (G-2028)
3.56%
USA, Notes 4% 31oct2029, USD (R-2029)
2.48%
USA, Notes 1.25% 15aug2031, USD (E-2031)
2.31%
US01F0506844
1.45%
USA, Notes 4% 15feb2034, USD (B-2034)
1.43%
USA, Notes 3.75% 15apr2028, USD (AM-2028)
1.40%
USA, Notes 2.875% 15may2032, USD (C-2032)
1.40%
USA, Notes 2.25% 15aug2027, USD (E-2027)
1.37%
US01F0526800
1.03%
US21H0506806
0.90%
US01F0306864
0.89%
USA, Bonds 4.5% 15nov2054, USD
0.74%
USA, Bonds 2.5% 15may2046, USD
0.73%
USA, Bonds 2.5% 15feb2045, USD
0.69%
Frequently asked questions about IUSB and GCOR
How have the IUSB and GCOR ETFs performed in 2026?
As of September 16, 2026, IUSB is down -1.23% year-to-date (YTD), while GCOR has lost -1.63%. That puts IUSB better performer ahead so far this year.
Which ETF is attracting more investor money: IUSB or GCOR?
Year-to-date, the IUSB ETF saw +$10.90B in flows, compared to +$140M for GCOR.
Which ETF is more volatile: IUSB or GCOR?
Over the past year, IUSB had a volatility of 3.45%, while GCOR experienced 3.59%.
Which ETF is bigger: IUSB or GCOR?
As of September 16, 2026, IUSB holds $43.68 B in assets under management (AUM), while GCOR manages $809.93 M.
What sectors do the IUSB and GCOR ETFs invest in?
IUSB leans toward sectors like Sovereign and Finance. Meanwhile, GCOR focuses on Sovereign and Finance.
What are the top holdings of the IUSB ETF and GCOR ETF?
IUSB top holdings include BlackRock Liquidity TempCash, US01F0206874 and USA, Notes 4.375% 31dec2029, USD (AH-2029). GCOR holds in its top three: USA, Notes 3.875% 30nov2029, USD (S-2029), USA, Notes 0.75% 31jan2028, USD (G-2028) and USA, Notes 4% 31oct2029, USD (R-2029).
Which ETF is more diversified: IUSB or GCOR?
IUSB holds 18026 securities with 9.25% of its assets in the top 15. GCOR has 1679 securities and a top 15 weight of 25.19%.
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