ETF Trace

Fund report

US-listed

MBB

seeks to track the investment results of an index composed of investment-grade, mortgage-backed pass-through securities issued and/or guaranteed by U.S. government agencies.
iShares MBS ETF
BlackRock (iShares)
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Concentration
Well diversifiedtop 10 = 6.0%
diversifiedconcentrated
GROWTH · NAV (USD)rebased to 0%
Holdings
11153
as of 2026-02-28
Top 10
6.0%
TER
0.04%
cheaper than 94% of peers
Net assets
≈ US$41.6B
as filed
Largest
5.9%
P / E
–
Sections
Holdings as of 2026-02-28.
01Overview
the fund's regulatory facts
Fund currency
USD
Volatility 1Y
4.4%
How it tracks
Index, sampling
02Performance
price · as of 2026-07-23
1M
-1.2%
3M
-1.3%
6M
-0.5%
YTD
-0.4%
1Y
+4.2%
03Holdings
50 largest · as of 2026-02-28
#CompanyIdentifierWeight
1Freddie Mac USUS3132DWBP77
1.0
2Government National Mortgage Association USG2SF
1.0
3UMBS, TBA USFNCL
0.5
4Government National Mortgage Association USUS36179WP937
0.5
5Government National Mortgage Association USUS36179WTX64
0.5
6Fannie Mae USUS31418D7E66
0.5
7Government National Mortgage Association USG2SF
0.5
8Freddie Mac USUS3132DWBH51
0.5
9UMBS, TBA USFNCL
0.5
10Government National Mortgage Association USG2
0.4
11Government National Mortgage Association USG2SF
0.4
12Fannie Mae USUS31418D6B37
0.4
13Fannie Mae USUS3140XLE460
0.4
14Government National Mortgage Association USUS3618N5A332
0.4
15Government National Mortgage Association USUS36179WY855
0.4
16Government National Mortgage Association USUS36179WFG87
0.3
17UMBS, TBA USFNCI
0.3
18Freddie Mac USUS3132DWDC47
0.3
19Fannie Mae USUS31418DXK35
0.3
20Fannie Mae USUS3140XREC56
0.3
21Government National Mortgage Association USUS36179YFL39
0.3
22Fannie Mae USUS31418D4X74
0.3
23Government National Mortgage Association USUS36179WVT25
0.3
24Government National Mortgage Association USUS36179WLP13
0.3
25Fannie Mae USUS31418DYB27
0.3
26Fannie Mae USUS3140QHBC84
0.3
27Government National Mortgage Association USUS36179WY939
0.3
28Government National Mortgage Association USUS36179VZQ66
0.3
29Government National Mortgage Association USUS36179WTY48
0.3
30Government National Mortgage Association USUS36180ACA97
0.3
31Freddie Mac USUS3132DWG982
0.2
32UMBS, TBA USFNCL
0.2
33Government National Mortgage Association USUS3618N5VS51
0.2
34Freddie Mac USUS3132DWCT80
0.2
35Fannie Mae Pool USFN
0.2
36Government National Mortgage Association USUS36179Y2N36
0.2
37Government National Mortgage Association USUS36179W2U15
0.2
38Government National Mortgage Association USUS36179WNE48
0.2
39Freddie Mac USUS3132DWBB81
0.2
40Freddie Mac USUS3132DWJF14
0.2
41Fannie Mae USUS3140XHHS99
0.2
42Fannie Mae USUS3140QVG328
0.2
43Freddie Mac USUS3133KLYA96
0.2
44Fannie Mae USUS3140QHKW48
0.2
45Government National Mortgage Association USUS36179Y5M26
0.2
46Fannie Mae USUS3140XRPU36
0.2
47Government National Mortgage Association USUS3618N5C569
0.2
48Freddie Mac USUS31427MT276
0.2
49Freddie Mac Pool USUS3132DWEF68
0.2
50Fannie Mae USUS3140MCAF73
0.2
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04Exposure
Bonds 94.3%Cash 5.7%
By country
USUnited States104.3%
CurrencyUSD 104.3%

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