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FAAAvsMBBETF Comparison

ETF 1
FAAA

Fidelity AAA CLO ETF

This fund is part of
US Corporate IG Bonds
-0.22%
VS
ETF 2
MBB

iShares MBS ETF

This fund is part of
MBS & ABS
-0.35%

Fidelity AAA CLO ETF (FAAA) belongs to the US Corporate IG Bonds segment. iShares MBS ETF (MBB) is part of the MBS & ABS segment. FAAA's top 2 sector exposures are Industrials and Non-Corporate. In contrast, MBB's top sector exposures are Industrials, Non-Corporate and Finance. FAAA is more expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.04% for MBB. Run a side-by-side ETF comparison of FAAA 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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FAAA vs MBB performance and flow charts

Performance

-0.8-0.6-0.4-0.20.00.20.40.6%Jul 28Aug 4Aug 11Aug 18Aug 25

Cumulative Flows

0 M100 M200 M300 M400 M500 M600 M700 MJul 28Aug 4Aug 11Aug 18Aug 25

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Daily, global ETF data for advanced analysis or integration into apps (API), from our partner Trackinsight.

Historic performance and flows
Data as of 08/28/2026
1M3MYTD1Y3Y5Y
Perf.
FAAA
MBB
+0.48%-0.12%
+1.29%-0.47%
n/a+0.27%
n/a+3.02%
n/a+15.40%
n/a+1.02%
Flows
FAAA
MBB
+$26M+$655M
+$56M+$1.60B
-+$1.52B
--$888M
-+$12.43B
-+$18.00B
Volatility and drawdown
3M1Y3Y5Y
Volatility
FAAA
MBB
+0.20%+4.61%
n/a+4.21%
n/a+5.86%
n/a+6.59%
Max drawdown
FAAA
MBB
n/a-1.87%
n/a-2.92%
n/a-5.99%
n/a-17.29%
Max drawdown duration
FAAA
MBB
n/a60d
n/a180d
n/a91d
n/a1492d
Trading data

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FAAA
MBB
Last sale
8/28/2026 at 1:30 PM
$50.24
$93.17
Previous close
08/27/2026
$50.41
$93.52
Consolidated volume
08/27/2026
Average volume
30 days
Average discount or premium
30 days
Average Bid/Ask spread
30 days
Replication quality
Data as of July 31, 2026
1-year trailing difference

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FAAA
is actively managed and doesn’t replicate an index

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FAAA
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 8/28/2026 at 1:30 PM
Live
Closed
FAAA
MBB
Last price
$50.24
$93.17
1D performance
-0.34%
-0.37%
AuM$100.26 M$39.70 B
E/R0.2%0.04%
Characteristics
FAAA
MBB
Management strategyActivePassive
ProviderFidelityiShares
Benchmark-Bloomberg U.S. MBS Index
N° of holdings301231
Asset class-Bonds
Trailing 12m distribution yield
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Inception dateFebruary 11, 2026March 13, 2007
ESGNoNo
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Exposure

Countries

FAAA
USA
19.24%
Other
80.76%
MBB
USA
29.07%
Other
70.93%

Sectors

FAAA
Industrials
15.86%
Other
84.14%
MBB
Industrials
20.93%
Non-Corporate
7.91%
Other
71.16%
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Diversification

FAAA

Total weight of top 15 holdings out of 15

20.73%
MBB

Total weight of top 15 holdings out of 15

16.01%

Top 15 holdings

Data as of July 31, 2026
FAAA
Fidelity Cash Central Fund
3.38%
AGL CLO 2022-17A, FRN 22jan2035, USD (ABS, AR)
1.42%
US00176HAA86
1.35%
US92919DAL29
1.35%
US26254KAS24
1.35%
US55823TAA34
1.35%
Ares Loan Funding 2024-ALF8, FRN 25jan2038, USD (ABS, A1)
1.35%
US55952EAL56
1.35%
US55955LAS16
1.28%
US12575MAA99
1.15%
US55954NAS80
1.08%
US83011LAJ52
1.08%
US13877EAL65
1.08%
US12567MAN11
1.08%
US29002UAS96
1.08%
MBB
BlackRock Cash Funds - Institutional
7.91%
FR SD8146, 2% 1may2051, USD (ABS)
1.00%
US21H0526861
0.98%
US01F0506844
0.66%
US21H0506806
0.58%
US01F0526800
0.56%
G2 MB0025, 5% 20nov2054, USD (ABS)
0.53%
G2 MA7648, 2% 20oct2051, USD (ABS)
0.52%
US36179WTX64
0.51%
FN MA4492, 2% 1dec2051, USD (ABS)
0.50%
FR SD8140, 2% 1apr2051, USD (ABS)
0.48%
US21H0426872
0.46%
US21H0606895
0.45%
US36179WJR07
0.44%
FN MA4465, 2% 1nov2051, USD (ABS)
0.43%
Frequently asked questions about FAAA and MBB

Which ETF is bigger: FAAA or MBB?

As of August 28, 2026, FAAA holds $100.26 M in assets under management (AUM), while MBB manages $39.70 B.

What sectors do the FAAA and MBB ETFs invest in?

FAAA leans toward sectors like Industrials. Meanwhile, MBB focuses on Industrials and Non-Corporate.

What are the top holdings of the FAAA ETF and MBB ETF?

FAAA top holdings include Fidelity Cash Central Fund, AGL CLO 2022-17A, FRN 22jan2035, USD (ABS, AR) and US00176HAA86. MBB holds in its top three: BlackRock Cash Funds - Institutional, FR SD8146, 2% 1may2051, USD (ABS) and US21H0526861.

Which ETF is more diversified: FAAA or MBB?

FAAA holds 178 securities with 20.73% of its assets in the top 15. MBB has 9388 securities and a top 15 weight of 16.01%.

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