iShares MBS ETF (MBB) Holdings List

$92.74 +0.23 (+0.24%)

As of 12:52 PM Eastern

What stocks does MBB hold?

The iShares MBS ETF (MBB) top stock holdings include BLACKROCK CASH CL INST SL AGENCY, GNMA2 30YR TBA(REG C) - 5.5 2026-08-20, and FHLMC 30YR UMBS SUPER - 2.0 2051-05-01. The top 25 MBB holdings ordered by weight make up 18.83% of the total fund. MBB is a fixed income fund in the u.s. government category that invests in investments, focused on agency mbs strategies within the North America region. This page includes a complete MBB stock holdings list ranked by weight, along with a full breakdown of sector, geographic, industry, and currency exposure.

Top 25 MBB Holdings

Rank	Company	Current Price	Weight	Shares Held
1	BLACKROCK CASH CL INST SL AGENCY	N/A	6.65%	2,603,956,267
2	GNMA2 30YR TBA(REG C) - 5.5 2026-08-20	N/A	1.07%	419,233,000
3	FHLMC 30YR UMBS SUPER - 2.0 2051-05-01	N/A	1.00%	491,168,299
4	UMBS 30YR TBA(REG A) - 5.5 2026-09-14	N/A	0.96%	375,727,000
5	UMBS 30YR TBA(REG A) - 5.0 2026-09-14	N/A	0.72%	288,597,000
6	GNMA2 30YR TBA(REG C) - 5.0 2026-08-20	N/A	0.63%	252,832,000
7	GNMA2 30YR - 5.0 2054-11-20	N/A	0.52%	208,873,661
8	GNMA2 30YR - 2.0 2051-10-20	N/A	0.51%	249,446,297
9	GNMA2 30YR - 2.0 2051-12-20	N/A	0.51%	245,205,981
10	FNMA 30YR UMBS - 2.0 2051-12-01	N/A	0.50%	246,002,582
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11	FHLMC 30YR UMBS SUPER - 2.0 2051-04-01	N/A	0.48%	235,732,157
12	GNMA2 30YR TBA(REG C) - 4.5 2026-08-20	N/A	0.48%	196,557,000
13	GNMA2 30YR TBA(REG C) - 6.0 2026-08-20	N/A	0.45%	173,486,000
14	GNMA2 30YR - 2.5 2051-07-20	N/A	0.43%	200,658,389
15	FNMA 30YR UMBS - 2.0 2051-11-01	N/A	0.42%	208,636,890
16	FNMA 30YR UMBS SUPER - 2.0 2051-07-01	N/A	0.41%	203,802,253
17	UMBS 15YR TBA(REG B) - 4.0 2026-09-17	N/A	0.40%	161,350,000
18	GNMA2 30YR - 5.5 2053-09-20	N/A	0.39%	149,474,856
19	GNMA2 30YR - 5.0 2056-04-20	N/A	0.37%	149,831,834
20	GNMA2 30YR - 2.0 2052-03-20	N/A	0.34%	167,148,010
21	GNMA2 30YR - 2.5 2051-05-20	N/A	0.34%	156,157,993
22	UMBS 30YR TBA(REG A) - 6.0 2026-09-14	N/A	0.33%	125,778,000
23	FNMA 30YR UMBS SUPER - 2.0 2052-04-01	N/A	0.31%	153,798,542
24	FNMA 30YR UMBS - 2.0 2051-03-01	N/A	0.31%	153,378,531
25	UMBS 15YR TBA(REG B) - 2.0 2026-09-17	N/A	0.30%	130,345,791

MBB Geographic Exposure

MBB's largest geographic exposure is United States at 100.4%.

United States
100.0%

MBB Currency Exposure

MBB is exclusively exposed to USD.

USD
100.0%

MBB Sector Exposure

MBB's largest sector exposure is Financials at 80.6%.

Financials
80.6%

MBB Industry Exposure

MBB's largest industry exposure is Thrifts & Mortgage Finance at 80.5%, followed by Diversified Financial Services at 0.1%.

Thrifts & Mortgage Finance
80.5%
Diversified Financial Services
0.1%

MBB Sub-Industry Exposure

MBB's largest sub-industry exposure is Thrifts & Mortgage Finance at 80.6%.

Thrifts & Mortgage Finance
80.6%

MBB Coupon Exposure

MBB's largest coupon exposure is 2-4 at 60.6%, followed by 4-6 at 34.2%.

2-4
60.6%
4-6
34.2%
6-8
11.3%

MBB Maturity Exposure

MBB's largest maturity exposure is 20-30 at 77.3%, followed by 0-1 at 6.3%.

20-30
77.3%
0-1
6.3%
10-15
6.0%
30+
5.1%
15-20
2.9%
5-10
1.9%
3-5
0.2%

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MarketBeat tracks iShares MBS ETF holdings and portfolio composition, last updated on 8/27/2026.

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iShares MBS ETF (MBB) Holdings List