ISTBvsBIVETF Comparison
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iShares Core 1-5 Year USD Bond ETF (ISTB) belongs to the US Aggregate Bonds segment. Vanguard Intermediate-Term Bond ETF (BIV) is part of the US Government Bonds segment. ISTB's top 3 sector exposures are Sovereign, Finance and Industrials. In contrast, BIV's top sector exposures are Sovereign, Finance and Utilities. ISTB is more expensive with a Total Expense Ratio (TER) of 0.06%, versus 0.03% for BIV. ISTB is up 0.59% year-to-date (YTD) with +$765M in YTD flows. BIV performs worse with -1.79% YTD performance, and +$2.96B in YTD flows. Run a side-by-side ETF comparison of ISTB and BIV 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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ISTB vs BIV performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/22/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | ISTB BIV | +0.32%+0.19% | +0.07%-0.96% | +0.59%-1.79% | +1.18%-1.94% | +15.96%+17.34% | +10.49%+0.06% |
| Flows | ISTB BIV | +$208M+$66M | +$312M+$383M | +$765M+$2.96B | +$892M+$4.12B | +$1.25B+$13.38B | -$396M+$16.76B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | ISTB BIV | +2.04%+4.86% | +1.81%+4.21% | +2.14%+5.14% | +2.68%+6.32% |
| Max drawdown | ISTB BIV | -1.51%-3.66% | -1.51%-5.46% | -1.51%-5.46% | -8.72%-17.58% |
| Max drawdown duration | ISTB BIV | 58d58d | 58d235d | 58d235d | 968d1403d |
Trading data
ISTB | BIV | |
Last sale 10/23/2026 at 1:30 PM | $47.44 | $73.93 |
| Previous close 10/22/2026 | $47.47 | $74.07 |
| Consolidated volume 10/22/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of September 30, 2026
1-year trailing difference
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ISTB | BIV | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 10/23/2026 at 1:30 PM
Live
Closed
ISTB | BIV | |
|---|---|---|
| Last price | $47.44 | $73.93 |
| 1D performance | -0.06% | -0.19% |
| AuM | $5.34 B | $28.59 B |
| E/R | 0.06% | 0.03% |
Characteristics
ISTB | BIV | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | iShares | Vanguard |
| Benchmark | Bloomberg U.S. Universal 1-5 Year Index | Bloomberg U.S. 5–10 Year Government/Credit Float Adjusted Index |
| N° of holdings | 6956 | 2280 |
| Asset class | Bonds | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | October 18, 2012 | April 3, 2007 |
| ESG | No | No |
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Exposure
Countries
ISTB
USA
77.86%
Other
22.14%
BIV
USA
87.05%
Other
12.95%
Sectors
ISTB
Sovereign
54.43%
Finance
18.71%
Other
26.86%
BIV
Sovereign
54.89%
Finance
17.59%
Other
27.52%
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Diversification
ISTB
Total weight of top 15 holdings out of 15
12.68%
BIV
Total weight of top 15 holdings out of 15
29.49%
Top 15 holdings
Data as of August 31, 2026
ISTB
USA, Notes 3.875% 15jun2028, USD (AP-2028)
1.09%
USA, Notes 4.125% 30jun2031, USD (AA-2031)
1.06%
BlackRock Cash Funds - Institutional
1.06%
USA, Notes 4% 28feb2030, USD (H-2030)
0.91%
USA, Notes 3.625% 31oct2030, USD (AF-2030)
0.89%
USA, Notes 4.375% 31jul2031, USD (AB-2031)
0.87%
USA, Notes 3.5% 30nov2030, USD (AG-2030)
0.84%
USA, Notes 3.75% 31jan2031, USD (U-2031)
0.81%
USA, Notes 3.625% 30sep2030, USD (AD-2030)
0.81%
USA, Notes 3.625% 31aug2030, USD (AC-2030)
0.79%
USA, Notes 4% 31may2030, USD (Z-2030)
0.77%
USA, Notes 3.875% 15jul2028, USD (AQ-2028)
0.75%
USA, Notes 4% 31jul2029, USD (AB-2029)
0.74%
USA, Notes 4.5% 31may2029, USD (Z-2029)
0.66%
USA, Notes 4.25% 30jun2029, USD (AA-2029)
0.65%
BIV
USA, Notes 4% 15feb2034, USD (B-2034)
2.12%
USA, Notes 4.375% 15may2034, USD (C-2034)
2.11%
USA, Notes 4.625% 15feb2035, USD (B-2035)
2.08%
USA, Notes 4.25% 15nov2034, USD (F-2034)
2.07%
USA, Notes 4.125% 15feb2036, USD (B-2036)
2.05%
USA, Notes 4.25% 15may2035, USD (C-2035)
2.04%
USA, Notes 4.25% 15aug2035, USD (E-2035)
2.04%
USA, Notes 4% 15nov2035, USD (F-2035)
2.03%
USA, Notes 4.5% 15nov2033, USD (F-2033)
2.02%
USA, Notes 3.875% 15aug2034, USD (E-2034)
2.00%
USA, Notes 4.375% 15may2036, USD (C-2036)
2.00%
USA, Notes 3.875% 15aug2033, USD (E-2033)
1.83%
USA, Notes 4.125% 15nov2032, USD (F-2032)
1.72%
USA, Notes 1.375% 15nov2031, USD (F-2031)
1.70%
USA, Notes 3.5% 15feb2033, USD (B-2033)
1.65%
Frequently asked questions about ISTB and BIV
How have the ISTB and BIV ETFs performed in 2026?
As of October 22, 2026, ISTB is up 0.59% year-to-date (YTD), while BIV has lost -1.79%. That puts ISTB better performer ahead so far this year.
Which ETF is attracting more investor money: ISTB or BIV?
Year-to-date, the ISTB ETF saw +$765M in flows, compared to +$2.96B for BIV.
Which ETF is more volatile: ISTB or BIV?
Over the past year, ISTB had a volatility of 1.81%, while BIV experienced 4.21%.
Which ETF is bigger: ISTB or BIV?
As of October 22, 2026, ISTB holds $5.34 B in assets under management (AUM), while BIV manages $28.59 B.
What sectors do the ISTB and BIV ETFs invest in?
ISTB leans toward sectors like Sovereign and Finance. Meanwhile, BIV focuses on Sovereign and Finance.
What are the top holdings of the ISTB ETF and BIV ETF?
ISTB top holdings include USA, Notes 3.875% 15jun2028, USD (AP-2028), USA, Notes 4.125% 30jun2031, USD (AA-2031) and BlackRock Cash Funds - Institutional. BIV holds in its top three: USA, Notes 4% 15feb2034, USD (B-2034), USA, Notes 4.375% 15may2034, USD (C-2034) and USA, Notes 4.625% 15feb2035, USD (B-2035).
Which ETF is more diversified: ISTB or BIV?
ISTB holds 7351 securities with 12.68% of its assets in the top 15. BIV has 2344 securities and a top 15 weight of 29.49%.
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