iShares
The iShares Barclays MBS Bond Fund seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the investment grade agency mortgage-backed securities sector of the United States as defined by the Barclays Capital U.S. MBS Index.

View all holdings and learn more about mortgage exposure and cash investments in this fund.
Yield as of 2/2/2012
Description %
30-Day SEC Yield 30-Day SEC Yield 3.22%
Average Yield to MaturityAverage Yield to Maturity 1.03%
Distribution YieldDistribution Yield 3.13%
12-Month Yield 12-Month Yield
as of 2/2/2012
3.28%
Fundamentals as of 2/2/2012
Description Value
Weighted Average Life Weighted Average Life 2.28 yr
Weighted Average Coupon Weighted Average Coupon4.67%
Effective Duration Effective Duration 1.22
Standard Deviation (3 year) Standard Deviation
as of 1/31/2012
--
Avg. Annualized Total Returns (NAV)qtr. as of 12/31/2011
1 Year
3 Years
5 Years
10 Years
Since Inception
MBB 5.88% 5.54% -- -- 5.96%
Index Index 6.23% 5.83% 6.54% 5.69% 6.45%
Sector Breakdownas of 2/1/2012*
Sector % of Fund Sector % of Fund  
 
CONVENTION...
56.40%
 
10/1 ARM
0.81%
 
GNMA 30 YR
21.53%
 
AGENCY HYB...
0.55%
 
CONVENTION...
14.00%
 
3/1 ARM
0.25%
 
CONVENTION...
2.26%
 
7/1 ARM
0.18%
 
OWNED NO G...
2.26%
 
Other/Unde...
0.42%
 
5/1 ARM
1.33%
 
Top Holdings as of 2/1/2012*
Name
% of Fund
Coupon Maturity Moody's/S&P Rating
FNMA 30YR 1.51% 5.00 5/1/2041 Aaa /AA+
FNMA 30YR 1.36% 4.50 8/1/2040 Aaa /AA+
FNMA 30YR 1.31% 4.50 5/1/2041 Aaa /AA+
GNMA2 30YR 1.25% 5.00 7/20/2040 Aaa /AA+
GS - Yunnan Baiyao Group Co., Ltd. 1.19% 5.00 5/15/2038 Aaa /AA+
FGOLD 30YR 1.09% 4.50 10/1/2039 Aaa /AA+
GNMA2 30YR 1.07% 4.50 6/20/2041 Aaa /AA+
GNMA 30YR 1.06% 4.50 5/15/2039 Aaa /AA+
FNMA 30YR 1.03% 6.00 6/1/2039 Aaa /AA+
GNMA2 30YR 1.02% 4.00 12/20/2041 Aaa /AA+
Total11.90% 
*Holdings are subject to change.
Profile as of 2/3/2012
Description Value
Total Net Assets$4,244,130,225
Expense Ratio0.31%
Shares Outstanding39,300,000
Number of Holdings
as of 2/1/2012
259
Fund Credit Rating - S&P**Fund Credit Rating - S&PAAf
Inception Date3/13/2007
Related Index--
Net Asset Value
as of 2/3/2012
$107.99
  • $-0.09
  • -0.09%
Price
as of 2/2/2012
$108.18
  • $0.07
  • 0.06%
The performance quoted represents past performance and does not guarantee future results. Investment return and principal value of an investment will fluctuate so that an investor's shares, when sold or redeemed, may be worth more or less than the original cost. Current performance may be lower or higher than the performance quoted. This information must be accompanied by standardized returns. For standardized returns and performance data current to the most recent month end, click the "Performance" tab above.
Fees & Expenses
Expense Type %
Management Fees 0.25%
+
Acquired Fees & Expenses ‡ 0.06%
=
Total Annual Fund Operating Expenses † 0.31%
Credit Ratings as of 2/1/2012
S&P/Moody's
S&P Moody's
AAA/Aaa 0.00% 99.58%
AA+/Aa1 99.58% 0.00%
AA/Aa2 0.00% 0.00%
AA-/Aa3 0.00% 0.00%
A+/A1 0.00% 0.00%
A/A2 0.00% 0.00%
A-/A3 0.00% 0.00%
BBB+/Baa1 0.00% 0.00%
BBB/Baa2 0.00% 0.00%
BBB-/Baa3 0.00% 0.00%
BB+/Ba1 0.00% 0.00%
BB/Ba2 0.00% 0.00%
BB-/Ba3 0.00% 0.00%
B+/B1 0.00% 0.00%
B/B2 0.00% 0.00%
B-/B3 0.00% 0.00%
CCC+/Caa1 0.00% 0.00%
CCC/Caa2 0.00% 0.00%
CCC-/Caa3 0.00% 0.00%
CC/Ca 0.00% 0.00%
C/C 0.00% 0.00%
R/-- 0.00% --
SD/-- 0.00% --
D/-- 0.00% --
Not Rated 0.00% 0.00%
Other 0.42% 0.42%

Ratings are measured on a scale that generally ranges from AAA (S&P highest) or Aaa (Moody's highest) to D (S&P lowest) or C (Moody's lowest). "Other" applies to securities for which ratings are not available.

Trading Information
Identifier Type Symbol
TickerMBB
Related Index--
NAVMBB.NV
Underlying Trading ValueMBB.IV
Shares OutstandingMBB.SO
Estimated CashMBB.EU
Total CashMBB.TC
CUSIP464288588

** For more information on S&P fund credit ratings, please click here.

Carefully consider the iShares Funds' investment objectives, risk factors, and charges and expenses before investing. This and other information can be found in the Funds' prospectuses, which may be obtained by calling 1-800-iShares (1-800-474-2737), or by viewing or downloading a prospectus. Read the prospectus carefully before investing.

Investing involves risk, including possible loss of principal.

‡ “Acquired Fund Fees and Expenses” reflect the Fund's pro rata share of the indirect fees and expenses incurred by investing in one or more acquired funds, such as mutual funds, business development companies, or other pooled investment vehicles. Acquired Fund Fees and Expenses are reflected in the prices of the acquired funds and thus included in the total returns of the Fund.

† The total annual operating expenses of the iShares Barclays Aggregate Bond Fund and iShares Barclays MBS Bond Fund include “acquired fund fees and expenses” which are related to the funds' investments in the BlackRock Cash Funds: Prime (the “money market fund”). “Acquired fund fees and expenses” represent the funds' pro rata share of the fees and expenses charged by the money market fund and may vary based on the funds' allocation of assets to the annualized net expenses of the money market fund. Annual operating expenses do not include the effect of interest earned by investments in the money market fund, which is expected to offset the money market fund's fees and expenses.

The iShares Funds ("Funds") are distributed by SEI Investments Distribution Co. ("SEI"). BlackRock Fund Advisors ("BFA") serves as the investment advisor to the Funds. BFA is a subsidiary of BlackRock Institutional Trust Company, N.A., neither of which is affiliated with SEI.

Bonds and bond funds generally decrease in value as interest rates rise. Mortgage-backed securities are subject to prepayment and extension risk and therefore react differently to changes in interest rates than other bonds. Small movements in interest rates may quickly and significantly reduce the value of certain mortgage-backed securities.

Index returns are for illustrative purposes only and do not represent actual iShares performance. Index performance returns do not reflect any management fees, transaction costs or expenses. Indexes are unmanaged and one cannot invest directly in an index. Past performance does not guarantee future results.

The iShares Funds are not sponsored, endorsed or issued by Barclays Capital. This company does not make any representation regarding the advisability of investing in the Funds. Neither SEI, nor BlackRock Institutional Trust Company, N.A., nor any of their affiliates, are affiliated with the company listed above.

Shares of iShares Funds are bought and sold at market price (not NAV) and are not individually redeemed from the Fund. Brokerage commissions will reduce returns.

Certain sectors and markets perform exceptionally well based on current market conditions and iShares funds can benefit from that performance. Achieving such exceptional returns involves the risk of volatility and investors should not expect that such results will be repeated.

© 2000-2012 BlackRock Institutional Trust Company, N.A. All rights reserved. iShares® is a registered trademark of BlackRock Institutional Trust Company, N.A. BlackRock® is a registered trademark of BlackRock, Inc. All other trademarks, servicemarks or registered trademarks are the property of their respective owners.