FSTBvsIUSBETF Comparison
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Fidelity Short-Term Bond ETF (FSTB) belongs to the Intl IG Bonds segment. iShares Core Total USD Bond Market ETF (IUSB) is part of the US Aggregate Bonds segment. Both ETFs have the same top 3 sector exposures: Sovereign, Finance and Industrials. FSTB is more expensive with a Total Expense Ratio (TER) of 0.21%, versus 0.06% for IUSB. Run a side-by-side ETF comparison of FSTB and IUSB 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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FSTB vs IUSB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 11/06/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | FSTB IUSB | +0.94%+2.49% | +0.60%-0.04% | n/a-0.03% | n/a+0.38% | n/a+16.77% | n/a+0.89% |
| Flows | FSTB IUSB | +$3M+$1.13B | +$64M+$7.72B | -+$17.37B | -+$18.56B | -+$28.50B | -+$37.85B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | FSTB IUSB | +1.54%+4.36% | n/a+3.73% | n/a+4.53% | n/a+5.56% |
| Max drawdown | FSTB IUSB | -0.96%-3.24% | n/a-4.33% | n/a-4.33% | n/a-17.40% |
| Max drawdown duration | FSTB IUSB | 65d73d | n/a250d | n/a280d | n/a1406d |
Trading data
FSTB | IUSB | |
Last sale 11/6/2026 at 2:30 PM | $19.90 | $44.94 |
| Previous close 11/04/2026 | $19.88 | $44.98 |
| Consolidated volume 11/04/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of October 30, 2026
1-year trailing difference
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FSTB
is actively managed and doesn’t replicate an indexFSTB | IUSB | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 11/6/2026 at 2:30 PM
Live
Closed
FSTB | IUSB | |
|---|---|---|
| Last price | $19.90 | $44.94 |
| 1D performance | +0.10% | -0.09% |
| AuM | $237.00 M | $50.43 B |
| E/R | 0.21% | 0.06% |
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Exposure
Countries
FSTB
USA
62.44%
Other
37.56%
IUSB
USA
71.83%
Other
28.17%
Sectors
FSTB
Sovereign
36.96%
Finance
27.22%
Other
35.82%
IUSB
Sovereign
41.82%
Finance
12.96%
Other
45.22%
Diversification
FSTB
Total weight of top 15 holdings out of 15
45.14%
IUSB
Total weight of top 15 holdings out of 15
10.41%
Top 15 holdings
Data as of September 30, 2026
FSTB
USA, Notes 3.875% 15may2029, USD (AN-2029)
11.66%
USA, Notes 3.375% 15sep2028, USD (AS-2028)
6.26%
USA, Notes 3.5% 15dec2028, USD (AV-2028)
6.22%
USA, Notes 3.5% 15feb2029, USD (AK-2029)
5.24%
US91282CRG86
4.95%
USA, Notes 4.625% 30sep2028, USD (AD-2028)
4.44%
USA, Notes 3.625% 15aug2028, USD (AR-2028)
2.99%
US31635A1051
0.83%
Bank of America Corporation, 4.271% 23jul2029, USD (N)
0.43%
HSBC Holdings plc, 4.711% 12may2030, USD
0.37%
US12567MAN11
0.36%
JP Morgan, 4.851% 25jul2028, USD
0.36%
Bank of America Corporation, 4.979% 24jan2029, USD (N)
0.35%
US33884EAQ44
0.34%
US33883JBG58
0.34%
IUSB
BlackRock Liquidity TempCash
5.04%
USA, Notes 4.625% 15feb2035, USD (B-2035)
0.50%
US01F0206A20
0.50%
USA, Notes 4% 15nov2035, USD (F-2035)
0.43%
USA, Notes 4.25% 15aug2035, USD (E-2035)
0.42%
USA, Notes 1.875% 15feb2032, USD (B-2032)
0.39%
USA, Notes 4.125% 31may2031, USD (Z-2031)
0.38%
US01F0526A56
0.37%
USA, Notes 4.125% 15feb2036, USD (B-2036)
0.36%
US01F0204A48
0.36%
US91282CRH69
0.34%
USA, Notes 1.25% 30sep2028, USD (Q-2028)
0.34%
USA, Notes 4.875% 31oct2028, USD (AF-2028)
0.33%
USA, Notes 4.375% 31dec2029, USD (AH-2029)
0.33%
USA, Notes 4.625% 30sep2028, USD (AD-2028)
0.33%
Frequently asked questions about FSTB and IUSB
Which ETF is bigger: FSTB or IUSB?
As of November 6, 2026, FSTB holds $237.00 M in assets under management (AUM), while IUSB manages $50.43 B.
What sectors do the FSTB and IUSB ETFs invest in?
FSTB leans toward sectors like Sovereign and Finance. Meanwhile, IUSB focuses on Sovereign and Finance.
What are the top holdings of the FSTB ETF and IUSB ETF?
FSTB top holdings include USA, Notes 3.875% 15may2029, USD (AN-2029), USA, Notes 3.375% 15sep2028, USD (AS-2028) and USA, Notes 3.5% 15dec2028, USD (AV-2028). IUSB holds in its top three: BlackRock Liquidity TempCash, USA, Notes 4.625% 15feb2035, USD (B-2035) and US01F0206A20.
Which ETF is more diversified: FSTB or IUSB?
FSTB holds 440 securities with 45.14% of its assets in the top 15. IUSB has 18160 securities and a top 15 weight of 10.41%.
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Latest news about FSTB & IUSB
Why IUSB Is Overtaking AGG as the Default Bond ETF for Investors
October 23, 2026
IUSB
The Weekly ETF Market Monitor (September 21-25, 2026)
September 26, 2026
IUSB
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