SPABvsIUSBETF Comparison
VS
State Street SPDR Portfolio Aggregate Bond ETF (SPAB) and iShares Core Total USD Bond Market ETF (IUSB) belong to the same industry segment: US Aggregate Bonds. Both ETFs have the same top 3 sector exposures: Sovereign, Finance and Industrials. SPAB is less expensive with a Total Expense Ratio (TER) of 0.03%, versus 0.06% for IUSB. SPAB is down -1.55% year-to-date (YTD) with +$1.57B in YTD flows. IUSB performs better with -1.42% YTD performance, and +$16.70B in YTD flows. Run a side-by-side ETF comparison of SPAB 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.
Find out how industry players manage ETF portfolios. Discover our library of Model portfolios
SPAB vs IUSB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/16/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SPAB IUSB | -0.06%-0.19% | -1.75%-1.78% | -1.55%-1.42% | -1.68%-1.37% | +14.97%+16.28% | -1.79%+0.06% |
| Flows | SPAB IUSB | +$530M+$6.05B | +$858M+$7.66B | +$1.57B+$16.70B | +$2.03B+$18.01B | +$3.57B+$27.91B | +$5.17B+$37.54B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPAB IUSB | +4.38%+4.15% | +3.86%+3.66% | +4.97%+4.63% | +5.98%+5.55% |
| Max drawdown | SPAB IUSB | -3.30%-3.24% | -4.68%-4.33% | -4.87%-4.33% | -17.44%-17.40% |
| Max drawdown duration | SPAB IUSB | 52d52d | 229d229d | 284d280d | 1556d1406d |
Trading data
SPAB | IUSB | |
Last sale 10/16/2026 at 1:30 PM | $24.59 | $44.47 |
| Previous close 10/15/2026 | $24.59 | $44.47 |
| Consolidated volume 10/15/2026 | ||
| 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
Create an account to view replication metrics
Join for free
SPAB | IUSB | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
Advertisement
Main metrics
Last update 10/16/2026 at 1:30 PM
Live
Closed
SPAB | IUSB | |
|---|---|---|
| Last price | $24.59 | $44.47 |
| 1D performance | +0.00% | +0.00% |
| AuM | $10.42 B | $49.25 B |
| E/R | 0.03% | 0.06% |
Characteristics
SPAB | IUSB | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | State Street Investment Management | iShares |
| Benchmark | Bloomberg US Aggregate Bond Index | Bloomberg U.S. Universal Index |
| N° of holdings | 6931 | 16069 |
| Asset class | Bonds | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | May 23, 2007 | June 10, 2014 |
| ESG | No | No |
Exposure
Countries
SPAB
USA
74.49%
Other
25.51%
IUSB
USA
72.98%
Other
27.02%
Sectors
SPAB
Sovereign
45.89%
Finance
10.21%
Industrials
9.47%
Other
34.43%
IUSB
Sovereign
42.65%
Finance
13.17%
Other
44.17%
Advertisement
Diversification
SPAB
Total weight of top 15 holdings out of 15
6.59%
IUSB
Total weight of top 15 holdings out of 15
9.55%
Top 15 holdings
Data as of August 31, 2026
SPAB
USA, Notes 3.5% 15dec2028, USD (AV-2028)
0.74%
US91282CRJ26
0.58%
USA, Notes 3.625% 31dec2030, USD (AH-2030)
0.55%
US01F0526982
0.50%
USA, Notes 3.375% 30nov2027, USD (BL-2027)
0.45%
USA, Notes 4.375% 30nov2028, USD (AG-2028)
0.41%
USA, Notes 3.5% 31jan2028, USD (U-2028)
0.41%
USA, Notes 3.875% 31mar2031, USD (W-2031)
0.40%
US01F0506927
0.38%
USA, Notes 3.375% 31dec2027, USD (BM-2027)
0.37%
USA, Notes 4.25% 15nov2034, USD (F-2034)
0.37%
USA, Notes 4.25% 15aug2035, USD (E-2035)
0.37%
USA, Notes 3.625% 30sep2031, USD (Q-2031)
0.36%
USA, Notes 4% 15feb2034, USD (B-2034)
0.35%
USA, Notes 4% 30jun2032, USD (M-2032)
0.35%
IUSB
BlackRock Liquidity TempCash
4.49%
USA, Notes 4% 15nov2035, USD (F-2035)
0.49%
US01F0206957
0.41%
USA, Notes 4.375% 31dec2029, USD (AH-2029)
0.37%
USA, Notes 4.375% 15may2036, USD (C-2036)
0.36%
USA, Notes 4.125% 30jun2031, USD (AA-2031)
0.36%
USA, Notes 4% 15feb2034, USD (B-2034)
0.35%
USA, Notes 4.375% 15may2034, USD (C-2034)
0.35%
USA, Notes 4.625% 15feb2035, USD (B-2035)
0.35%
USA, Notes 4.25% 15nov2034, USD (F-2034)
0.35%
USA, Notes 4.25% 15may2035, USD (C-2035)
0.34%
USA, Notes 4.25% 15aug2035, USD (E-2035)
0.34%
USA, Notes 3.875% 15aug2034, USD (E-2034)
0.34%
USA, Notes 4.125% 15feb2036, USD (B-2036)
0.33%
USA, Notes 2.75% 15aug2032, USD (E-2032)
0.32%
Frequently asked questions about SPAB and IUSB
How have the SPAB and IUSB ETFs performed in 2026?
As of October 16, 2026, SPAB is down -1.55% year-to-date (YTD), while IUSB has lost -1.42%. That puts IUSB better performer ahead so far this year.
Which ETF is attracting more investor money: SPAB or IUSB?
Year-to-date, the SPAB ETF saw +$1.57B in flows, compared to +$16.70B for IUSB.
Which ETF is more volatile: SPAB or IUSB?
Over the past year, SPAB had a volatility of 3.86%, while IUSB experienced 3.66%.
Which ETF is bigger: SPAB or IUSB?
As of October 16, 2026, SPAB holds $10.42 B in assets under management (AUM), while IUSB manages $49.25 B.
What sectors do the SPAB and IUSB ETFs invest in?
SPAB leans toward sectors like Sovereign, Finance and Industrials. Meanwhile, IUSB focuses on Sovereign and Finance.
What are the top holdings of the SPAB ETF and IUSB ETF?
SPAB top holdings include USA, Notes 3.5% 15dec2028, USD (AV-2028), US91282CRJ26 and USA, Notes 3.625% 31dec2030, USD (AH-2030). IUSB holds in its top three: BlackRock Liquidity TempCash, USA, Notes 4% 15nov2035, USD (F-2035) and US01F0206957.
Which ETF is more diversified: SPAB or IUSB?
SPAB holds 8475 securities with 6.59% of its assets in the top 15. IUSB has 18013 securities and a top 15 weight of 9.55%.
Advertisement
Latest news about SPAB & IUSB
Advertisement
