AAACvsMBBETF Comparison
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Columbia AAA CLO ETF (AAAC) belongs to the Intl IG Bonds segment. iShares MBS ETF (MBB) is part of the MBS & ABS segment. Both ETFs have the same top 3 sector exposures: Industrials, Non-Corporate and Finance. AAAC is more expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.04% for MBB. AAAC is up 4.01% year-to-date (YTD) with +$85M in YTD flows. MBB performs worse with -0.99% YTD performance, and -$1.79B in YTD flows. Run a side-by-side ETF comparison of AAAC and MBB 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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AAAC vs MBB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/28/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | AAAC MBB | +0.36%+2.12% | +1.20%-1.37% | +4.01%-0.99% | n/a-1.04% | n/a+19.36% | n/a+0.44% |
| Flows | AAAC MBB | -$8M-$1.87B | -$8M-$2.66B | +$85M-$1.79B | --$4.82B | -+$7.95B | -+$13.59B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | AAAC MBB | +0.21%+5.94% | n/a+4.71% | n/a+5.65% | n/a+6.68% |
| Max drawdown | AAAC MBB | -0.01%-4.27% | n/a-5.38% | n/a-5.38% | n/a-16.94% |
| Max drawdown duration | AAAC MBB | 4d64d | n/a241d | n/a241d | n/a1405d |
Trading data
AAAC | MBB | |
Last sale 10/29/2026 at 1:30 PM | $20.09 | $91.68 |
| Previous close 10/28/2026 | $20.08 | $91.41 |
| Consolidated volume 10/28/2026 | ||
| 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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AAAC
is actively managed and doesn’t replicate an indexAAAC | MBB | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 10/29/2026 at 1:30 PM
Live
Closed
AAAC | MBB | |
|---|---|---|
| Last price | $20.09 | $91.68 |
| 1D performance | +0.05% | +0.30% |
| AuM | $95.43 M | $35.55 B |
| E/R | 0.2% | 0.04% |
Characteristics
AAAC | MBB | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | Columbia Threadneedle Investments | iShares |
| Benchmark | - | Bloomberg U.S. MBS Index |
| N° of holdings | 17 | 1237 |
| Asset class | - | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | December 11, 2025 | March 13, 2007 |
| ESG | No | No |
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Exposure
Countries
AAAC
USA
18.09%
Other
81.91%
MBB
USA
28.44%
Other
71.56%
Sectors
AAAC
Industrials
13.11%
Other
86.89%
MBB
Industrials
20.61%
Non-Corporate
7.6%
Other
71.79%
Diversification
AAAC
Total weight of top 15 holdings out of 15
30.32%
MBB
Total weight of top 15 holdings out of 15
16.82%
Top 15 holdings
Data as of August 31, 2026
AAAC
Columbia Short Term Cash Fund
3.04%
US26249MAQ06
2.17%
US284913AA87
1.94%
Fortress Credit BSL 2025-2A, FRN 15oct2038, USD (ABS, A)
1.94%
US03754FAC23
1.93%
US77342MAY21
1.93%
US15032EAY59
1.93%
US67402FAU30
1.93%
US59966PAN24
1.93%
Ballyrock CLO 2024-22A, FRN 15jul2039, USD (ABS, A1R)
1.93%
US75901PAS56
1.93%
Venture CLO 2017-28A, FRN 20oct2034, USD (ABS, A1R)
1.93%
US48254GAW69
1.93%
US488930AA67
1.93%
US883932AN54
1.93%
MBB
BlackRock Cash Funds - Institutional
7.60%
US01F0526982
1.26%
US21H0526945
1.05%
FR SD8146, 2% 1may2051, USD (ABS)
0.98%
US01F0506927
0.87%
US21H0606978
0.63%
G2 MB0025, 5% 20nov2054, USD (ABS)
0.55%
US21H0506988
0.55%
G2 MA7648, 2% 20oct2051, USD (ABS)
0.51%
US36179WTX64
0.50%
FN MA4492, 2% 1dec2051, USD (ABS)
0.49%
US36179WJR07
0.48%
US21H0426955
0.48%
FR SD8140, 2% 1apr2051, USD (ABS)
0.47%
FN MA4465, 2% 1nov2051, USD (ABS)
0.42%
Frequently asked questions about AAAC and MBB
How have the AAAC and MBB ETFs performed in 2026?
As of October 28, 2026, AAAC is up 4.01% year-to-date (YTD), while MBB has lost -0.99%. That puts AAAC better performer ahead so far this year.
Which ETF is attracting more investor money: AAAC or MBB?
Year-to-date, the AAAC ETF saw +$85M in flows, compared to -$1.79B for MBB.
Which ETF is bigger: AAAC or MBB?
As of October 28, 2026, AAAC holds $95.43 M in assets under management (AUM), while MBB manages $35.55 B.
What sectors do the AAAC and MBB ETFs invest in?
AAAC leans toward sectors like Industrials. Meanwhile, MBB focuses on Industrials and Non-Corporate.
What are the top holdings of the AAAC ETF and MBB ETF?
AAAC top holdings include Columbia Short Term Cash Fund, US26249MAQ06 and US284913AA87. MBB holds in its top three: BlackRock Cash Funds - Institutional, US01F0526982 and US21H0526945.
Which ETF is more diversified: AAAC or MBB?
AAAC holds 92 securities with 30.32% of its assets in the top 15. MBB has 9405 securities and a top 15 weight of 16.82%.
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Latest news about AAAC & MBB
The Weekly ETF Market Monitor (September 28-October 2, 2026)
October 2, 2026
MBB
NYSE x ETF Central ETF Education Series
March 5, 2024
MBB
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