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 09/18/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | FSTB IUSB | -0.63%-1.10% | -0.01%-1.84% | n/a-1.14% | n/a-0.09% | n/a+14.02% | n/a-0.89% |
| Flows | FSTB IUSB | +$3M+$1.10B | +$178M+$2.87B | -+$11.03B | -+$11.91B | -+$22.50B | -+$32.14B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | FSTB IUSB | +1.34%+3.74% | n/a+3.49% | n/a+4.73% | n/a+5.54% |
| Max drawdown | FSTB IUSB | -0.73%-2.42% | n/a-2.91% | n/a-4.33% | n/a-17.80% |
| Max drawdown duration | FSTB IUSB | 24d81d | n/a201d | n/a280d | n/a1484d |
Trading data
FSTB | IUSB | |
Last sale 9/18/2026 at 1:30 PM | $19.82 | $44.77 |
| Previous close 09/17/2026 | $19.85 | $44.93 |
| Consolidated volume 09/17/2026 | ||
| 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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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 9/18/2026 at 1:30 PM
Live
Closed
FSTB | IUSB | |
|---|---|---|
| Last price | $19.82 | $44.77 |
| 1D performance | -0.15% | -0.36% |
| AuM | $178.25 M | $43.85 B |
| E/R | 0.21% | 0.06% |
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Exposure
Countries
FSTB
USA
67.17%
Other
32.83%
IUSB
USA
73.5%
Other
26.5%
Sectors
FSTB
Sovereign
40.52%
Finance
28.85%
Other
30.63%
IUSB
Sovereign
43.13%
Finance
13.46%
Other
43.41%
Diversification
FSTB
Total weight of top 15 holdings out of 15
45.28%
IUSB
Total weight of top 15 holdings out of 15
9.25%
Top 15 holdings
Data as of July 31, 2026
FSTB
USA, Notes 3.875% 15may2029, USD (AN-2029)
10.23%
USA, Notes 3.375% 15sep2028, USD (AS-2028)
6.64%
USA, Notes 3.5% 15dec2028, USD (AV-2028)
6.61%
USA, Notes 3.625% 15aug2028, USD (AR-2028)
6.51%
USA, Notes 3.5% 15feb2029, USD (AK-2029)
5.54%
USA, Notes 4.625% 30sep2028, USD (AD-2028)
3.81%
US31635A1051
2.29%
USA, Notes 4% 31may2028, USD (BC-2028)
1.03%
Bank of America Corporation, 4.271% 23jul2029, USD (N)
0.46%
JP Morgan, 4.851% 25jul2028, USD
0.38%
US12567MAN11
0.38%
Bank of America Corporation, 4.979% 24jan2029, USD (N)
0.37%
US33884EAQ44
0.36%
Goldman Sachs, 4.148% 21jan2029, USD
0.34%
Avolon Holdings, 4.95% 15jan2028, USD
0.33%
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%
Frequently asked questions about FSTB and IUSB
Which ETF is bigger: FSTB or IUSB?
As of September 18, 2026, FSTB holds $178.25 M in assets under management (AUM), while IUSB manages $43.85 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, US01F0206874 and USA, Notes 4.375% 31dec2029, USD (AH-2029).
Which ETF is more diversified: FSTB or IUSB?
FSTB holds 412 securities with 45.28% of its assets in the top 15. IUSB has 18026 securities and a top 15 weight of 9.25%.
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