iShares MBS ETF (MBB) Holdings List

$89.97 +0.14 (+0.16%)

Closing price 04:00 PM Eastern

Extended Trading

$89.62 -0.36 (-0.39%)

As of 07:30 PM Eastern

What stocks does MBB hold?

The iShares MBS ETF (MBB) has 10,858 holdings, with BLACKROCK CASH CL INST SL AGENCY, FHLMC 30YR UMBS SUPER - 2.0 2051-05-01, and GNMA2 30YR TBA(REG C) - 6.0 2026-10-20 among its largest positions. The top 25 MBB holdings ordered by weight make up 17.52% 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	6.49%	2,305,861,796
2	FHLMC 30YR UMBS SUPER - 2.0 2051-05-01	N/A	1.04%	488,011,446
3	GNMA2 30YR TBA(REG C) - 6.0 2026-10-20	N/A	0.68%	243,904,000
4	UMBS 30YR TBA(REG A) - 5.5 2026-10-13	N/A	0.59%	220,677,000
5	GNMA2 30YR - 5.0 2054-11-20	N/A	0.59%	221,930,795
6	GNMA2 30YR TBA(REG C) - 5.5 2026-10-20	N/A	0.57%	211,208,000
7	GNMA2 30YR - 2.0 2051-10-20	N/A	0.54%	247,568,264
8	GNMA2 30YR - 2.0 2051-12-20	N/A	0.53%	243,304,395
9	FNMA 30YR UMBS - 2.0 2051-12-01	N/A	0.52%	244,412,868
10	GNMA2 30YR - 2.5 2051-07-20	N/A	0.51%	226,503,266
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11	FHLMC 30YR UMBS SUPER - 2.0 2051-04-01	N/A	0.50%	234,368,342
12	FNMA 30YR UMBS - 2.0 2051-11-01	N/A	0.44%	207,344,113
13	GNMA2 30YR - 5.0 2056-04-20	N/A	0.43%	163,008,899
14	GNMA2 30YR TBA(REG C) - 5.0 2026-10-20	N/A	0.41%	156,382,000
15	GNMA2 30YR - 5.5 2053-09-20	N/A	0.40%	147,474,910
16	GNMA2 30YR - 5.5 2055-09-20	N/A	0.40%	145,963,422
17	GNMA2 30YR - 2.5 2051-05-20	N/A	0.35%	154,912,514
18	UMBS 30YR TBA(REG A) - 5.0 2026-10-13	N/A	0.35%	132,697,000
19	FNMA 30YR UMBS SUPER - 2.0 2052-04-01	N/A	0.32%	152,855,642
20	FNMA 30YR UMBS - 2.0 2051-03-01	N/A	0.32%	152,435,095
21	GNMA2 30YR - 2.0 2052-01-20	N/A	0.32%	149,148,211
22	GNMA2 30YR - 5.0 2056-05-20	N/A	0.32%	120,142,958
23	FNMA 30YR UMBS - 2.0 2051-10-01	N/A	0.31%	146,351,734
24	GNMA2 30YR - 2.5 2051-08-20	N/A	0.30%	132,405,821
25	FNMA 30YR UMBS - 2.0 2051-04-01	N/A	0.29%	138,139,477

MBB Geographic Exposure

MBB's largest geographic exposure is United States at 96.8%.

United States
96.8%

MBB Currency Exposure

MBB is exclusively exposed to USD.

USD
100.0%

MBB Sector Exposure

MBB's largest sector exposure is Financials at 78.3%.

Financials
78.3%

MBB Industry Exposure

MBB's largest industry exposure is Thrifts & Mortgage Finance at 78.2%, followed by Diversified Financial Services at 0.1%.

Thrifts & Mortgage Finance
78.2%
Diversified Financial Services
0.1%

MBB Sub-Industry Exposure

MBB's largest sub-industry exposure is Thrifts & Mortgage Finance at 78.3%.

Thrifts & Mortgage Finance
78.3%

MBB Coupon Exposure

MBB's largest coupon exposure is 2-4 at 56.2%, followed by 4-6 at 34.2%.

2-4
56.2%
4-6
34.2%
6-8
11.5%

MBB Maturity Exposure

MBB's largest maturity exposure is 20-30 at 76.9%, followed by 10-15 at 6.2%.

20-30
76.9%
10-15
6.2%
30+
6.1%
0-1
4.7%
15-20
2.7%
5-10
1.7%
3-5
0.1%

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MarketBeat tracks iShares MBS ETF holdings and portfolio composition, last updated on 10/2/2026.

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iShares MBS ETF (MBB) Holdings List