TAXFvsMBBAETF Comparison
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American Century Diversified Municipal Bond ETF (TAXF) belongs to the Municipal Bonds segment. iShares Mortgage-Backed Securities Active ETF (MBBA) is part of the MBS & ABS segment. TAXF's top 1 sector exposures are Municipal. In contrast, MBBA's top sector exposures are Industrials and Non-Corporate. TAXF is less expensive with a Total Expense Ratio (TER) of 0.25%, versus 0.26% for MBBA. Run a side-by-side ETF comparison of TAXF and MBBA 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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TAXF vs MBBA performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 08/31/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | TAXF MBBA | -0.23%+0.41% | -1.02%-0.81% | +0.64%n/a | +5.09%n/a | +11.86%n/a | +3.84%n/a |
| Flows | TAXF MBBA | +$5M+$5M | +$38M+$35M | +$143M- | +$193M- | +$348M- | +$554M- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | TAXF MBBA | +2.57%+4.76% | +2.54%n/a | +3.76%n/a | +3.71%n/a |
| Max drawdown | TAXF MBBA | -1.97%-2.02% | -2.70%n/a | -5.30%n/a | -13.26%n/a |
| Max drawdown duration | TAXF MBBA | 57d63d | 114dn/a | 275dn/a | 1001dn/a |
Trading data
TAXF | MBBA | |
Last sale 8/31/2026 at 1:30 PM | $49.58 | $48.76 |
| Previous close 08/31/2026 | $49.69 | $48.87 |
| Consolidated volume 08/31/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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Main metrics
Last update 8/31/2026 at 1:30 PM
Live
Closed
TAXF | MBBA | |
|---|---|---|
| Last price | $49.58 | $48.76 |
| 1D performance | -0.22% | -0.22% |
| AuM | $683.81 M | $157.24 M |
| E/R | 0.25% | 0.26% |
Characteristics
TAXF | MBBA | |
|---|---|---|
| Management strategy | Active | Active |
| Provider | American Century Investments | iShares |
| Benchmark | - | - |
| N° of holdings | 253 | 25 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | September 10, 2018 | January 23, 2026 |
| ESG | No | No |
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Exposure
Countries
TAXF
USA
37.04%
Other
62.96%
MBBA
Data will be available soon
Sectors
TAXF
Municipal
37.04%
Other
62.96%
MBBA
Data will be available soon
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Diversification
TAXF
Total weight of top 15 holdings out of 15
8.47%
MBBA
Data will be available soon
Top 15 holdings
Data as of July 31, 2026
TAXF
US74442PN840
0.89%
Build NYC Resource Corp., 5.25% 15dec2031, USD (2026B-3)
0.87%
Arkansas Development Finance Authority, 4% 1sep2046, USD (2026A)
0.73%
US60637GRY79
0.65%
Puerto Rico Sales Tax Financing Corp., 4.329% 1jul2040, USD
0.57%
US646080ZU81
0.57%
US452252RA98
0.55%
Southeast Alabama Gas Supply District, FRN 1aug2054, USD (A)
0.54%
Black Belt Energy Gas District, 5% 1oct2035, USD (2025)
0.54%
US681725PH47
0.47%
Orlando Utilities Commission, 5% 1oct2048, USD (2023A)
0.46%
US74439YBD22
0.44%
US292723AY90
0.42%
Patriots Energy Group Financing Agency, 5.25% 1oct2054, USD (2023A-1)
0.40%
New York Transitional Finance Authority, 5.5% 1nov2054, USD (2026)
0.39%
MBBA
Data will be available soon
Frequently asked questions about TAXF and MBBA
Which ETF is bigger: TAXF or MBBA?
As of August 31, 2026, TAXF holds $683.81 M in assets under management (AUM), while MBBA manages $157.24 M.
What sectors do the TAXF and MBBA ETFs invest in?
TAXF leans toward sectors like Municipal. Meanwhile, MBBA focuses on Industrials and Non-Corporate.
What are the top holdings of the TAXF ETF and MBBA ETF?
TAXF top holdings include US74442PN840, Build NYC Resource Corp., 5.25% 15dec2031, USD (2026B-3) and Arkansas Development Finance Authority, 4% 1sep2046, USD (2026A). MBBA holds in its top three: US01F0526800, US01F0206874 and BlackRock Liquidity T-Fund.
Which ETF is more diversified: TAXF or MBBA?
TAXF holds 785 securities with 8.47% of its assets in the top 15. MBBA has 491 securities and a top 15 weight of 89.36%.
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