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ETF · holdings as filed 2026-02-28

What's inside MBB?

iShares MBS ETF
Holdings
11,152
positions in the fund
Top 10
12%
of fund assets
Expense ratio
—
net, per year
Fund size
$40B
total net assets
Top 15 holdings
1
XTSLABLCKRCK CASH-TRSRY-SL AGNCY
5.90%
2
FR SD8146FR SD8146
1.07%
3
G2SF 5.5 3/12G2SF 5.5 3/12
1.00%
4
FNCL 5 3/12FNCL 5 3/12
0.57%
5
G2 MA7648G2 MA7648
0.56%
6
G2 MA7766G2 MA7766
0.55%
7
FN MA4492FN MA4492
0.53%
8
G2SF 5 3/12G2SF 5 3/12
0.53%
9
FR SD8140FR SD8140
0.51%
10
FNCL 5.5 3/12FNCL 5.5 3/12
0.50%
11
G2 MA7472G2 MA7472
0.47%
12
G2SF 6 3/12G2SF 6 3/12
0.45%
13
FN MA4465FN MA4465
0.45%
14
FN FS4654FN FS4654
0.45%
15
G2 MB0025G2 MB0025
0.42%
Sectors
1Unclassified
104%
Geography
1United States
104%
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Data source: official SEC Form N-PORT filings (as of 2026-02-28); expense ratio from SEC prospectus (risk/return) filings. Fund holdings are disclosed quarterly and may reflect a 60-day reporting delay.
Informational and educational only — not investment advice.