SPABvsAGGETF Comparison
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The ETFs State Street SPDR Portfolio Aggregate Bond ETF (SPAB) and iShares Core U.S. Aggregate Bond ETF (AGG) track the Bloomberg US Aggregate Total Return Index - USD and belong to the same industry segment: US Aggregate Bonds. Both ETFs have the same top 3 sector exposures: Sovereign, Finance and Industrials. Both SPAB and AGG have the same Total Expense Ratio (TER) of 0.03%. SPAB is down -1.55% year-to-date (YTD) with +$1.57B in YTD flows. AGG performs worse with -1.56% YTD performance, and +$9.47B in YTD flows. Run a side-by-side ETF comparison of SPAB and AGG 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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SPAB vs AGG 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 AGG | -0.06%-0.07% | -1.75%-1.76% | -1.55%-1.56% | -1.68%-1.69% | +14.97%+14.92% | -1.79%-1.69% |
| Flows | SPAB AGG | +$530M+$1.99B | +$858M+$3.85B | +$1.57B+$9.47B | +$2.03B+$12.04B | +$3.57B+$47.93B | +$5.17B+$66.75B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPAB AGG | +4.38%+4.37% | +3.86%+3.87% | +4.97%+4.94% | +5.98%+5.93% |
| Max drawdown | SPAB AGG | -3.30%-3.28% | -4.68%-4.64% | -4.87%-4.86% | -17.44%-17.35% |
| Max drawdown duration | SPAB AGG | 52d52d | 229d229d | 284d284d | 1556d1555d |
Trading data
SPAB | AGG | |
Last sale 10/16/2026 at 1:30 PM | $24.59 | $95.38 |
| Previous close 10/15/2026 | $24.59 | $95.41 |
| 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
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SPAB | AGG | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 10/16/2026 at 1:30 PM
Live
Closed
SPAB | AGG | |
|---|---|---|
| Last price | $24.59 | $95.38 |
| 1D performance | +0.00% | -0.03% |
| AuM | $10.42 B | $138.51 B |
| E/R | 0.03% | 0.03% |
Characteristics
SPAB | AGG | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | State Street Investment Management | iShares |
| Benchmark | Bloomberg US Aggregate Bond Index | Bloomberg US Aggregate Bond Index |
| N° of holdings | 6931 | 10222 |
| Asset class | Bonds | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | May 23, 2007 | September 22, 2003 |
| ESG | No | No |
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Exposure
Countries
SPAB
USA
74.49%
Other
25.51%
AGG
USA
76.71%
Other
23.29%
Sectors
SPAB
Sovereign
45.89%
Finance
10.21%
Industrials
9.47%
Other
34.43%
AGG
Sovereign
47.19%
Finance
9.95%
Industrials
7.05%
Other
35.81%
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Diversification
SPAB
Total weight of top 15 holdings out of 15
6.59%
AGG
Total weight of top 15 holdings out of 15
8.43%
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%
AGG
BlackRock Cash Funds - Institutional
3.01%
USA, Notes 4.625% 15feb2035, USD (B-2035)
0.41%
USA, Notes 4.25% 15nov2034, USD (F-2034)
0.40%
USA, Notes 4.375% 15may2034, USD (C-2034)
0.40%
USA, Notes 4% 28feb2030, USD (H-2030)
0.40%
USA, Notes 4.125% 15feb2036, USD (B-2036)
0.39%
USA, Notes 3.875% 15aug2034, USD (E-2034)
0.39%
USA, Notes 4.25% 15may2035, USD (C-2035)
0.39%
USA, Notes 4.5% 15nov2033, USD (F-2033)
0.39%
USA, Notes 4.25% 15aug2035, USD (E-2035)
0.38%
USA, Notes 3.875% 15jul2028, USD (AQ-2028)
0.38%
USA, Notes 4% 15nov2035, USD (F-2035)
0.38%
USA, Notes 4% 15feb2034, USD (B-2034)
0.37%
USA, Notes 4.375% 15may2036, USD (C-2036)
0.37%
USA, Notes 3.5% 15oct2028, USD (AT-2028)
0.37%
Frequently asked questions about SPAB and AGG
How have the SPAB and AGG ETFs performed in 2026?
As of October 16, 2026, SPAB is down -1.55% year-to-date (YTD), while AGG has lost -1.56%. That puts SPAB better performer ahead so far this year.
Which ETF is attracting more investor money: SPAB or AGG?
Year-to-date, the SPAB ETF saw +$1.57B in flows, compared to +$9.47B for AGG.
Which ETF is more volatile: SPAB or AGG?
Over the past year, SPAB had a volatility of 3.86%, while AGG experienced 3.87%.
Which ETF is bigger: SPAB or AGG?
As of October 16, 2026, SPAB holds $10.42 B in assets under management (AUM), while AGG manages $138.51 B.
What sectors do the SPAB and AGG ETFs invest in?
SPAB leans toward sectors like Sovereign, Finance and Industrials. Meanwhile, AGG focuses on Sovereign, Finance and Industrials.
What are the top holdings of the SPAB ETF and AGG ETF?
SPAB top holdings include USA, Notes 3.5% 15dec2028, USD (AV-2028), US91282CRJ26 and USA, Notes 3.625% 31dec2030, USD (AH-2030). AGG holds in its top three: BlackRock Cash Funds - Institutional, USA, Notes 4.625% 15feb2035, USD (B-2035) and USA, Notes 4.25% 15nov2034, USD (F-2034).
Which ETF is more diversified: SPAB or AGG?
SPAB holds 8475 securities with 6.59% of its assets in the top 15. AGG has 13256 securities and a top 15 weight of 8.43%.
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