The iShares S&P National AMT-Free Municipal Bond Fund seeks results that correspond generally to the price and yield performance, before fees and expenses, of the municipal bond sector of the United States as defined by the S&P National AMT-Free Municipal Bond Index.
Top Daily Holdings as of 9/2/2010*
Holding
% of Fund
Coupon Maturity Moody's/S&P Rating
CALIFORNIA ST 1.03% 6.00 4/1/2038 A1 /A-
NC ST 0.77% 5.00 3/1/2012 Aaa /AAA
OREGON ST 0.76% 4.50 8/1/2032 Aa1 /AA
SALT RIVER PROJ ARIZ AGRIC IMP 0.74% 5.00 1/1/2038 Aa1 /AA
REGIONAL TRANSN DIST COLO SALES TA 0.72% 4.50 11/1/2034 Aa2 /AAA
ILLINOIS ST 0.70% 5.00 3/1/2013 A1 /A+
CALIFORNIA ST 0.68% 5.00 10/1/2029 Baa1 /A
PUERTO RICO SALES TAX FING 0.63% 6.00 8/1/2042 A1 /A+
NORTH CAROLINA ST 0.62% 5.00 4/1/2013 Aaa /AAA
NEW YORK ST TWY AUTH HWY & BRD 0.61% 5.00 4/1/2014 Aa3 /AAA
Total7.27% 
*Holdings are subject to change.
Sector Breakdown as of 9/2/2010

Transportation
21.38%

Various Purpose
19.32%

Utility
19.14%

Tax-Revenue
14.36%

School District
6.16%

Improvement
4.36%

Education
3.97%

Building
3.19%

General Purpose
2.13%

Authority
1.74%

Other/Undefined
4.25%
Total100.00%
Top States as of 9/2/2010
California 21.94%
New York 17.53%
Texas 6.43%
Puerto Rico 6.08%
New Jersey 5.42%
Massachusetts 4.69%
Illinois 4.63%
Florida 3.51%
Georgia 2.68%
North Carolina 2.59%
Total75.50%
Maturity as of 9/2/2010
0-1 Years5.81%
1-5 Years21.87%
5-10 Years23.74%
10-15 Years11.34%
15-20 Years13.13%
20-25 Years7.10%
25 Years and Over16.39%
Average6.60 years
Average Annualized Total Returns (NAV)
quarterly, as of 6/30/2010
1 Year
3 Years
5 Years
10 Years
Since Inception
MUB 8.59% -- -- -- 4.97%
Index Index 9.68% -- -- -- 4.85%
Yield as of 9/2/2010
30-Day SEC Yield 30-Day SEC Yield 2.73%
Average Yield to MaturityAverage Yield to Maturity 2.81%
Distribution YieldDistribution Yield 3.54%
12-Month Yield 12-Month Yield
as of 9/2/2010
3.53%
Tax Equivalent Yield as of 9/2/2010
Tax Equivalent Distribution Yield Tax Equivalent Distribution Yield5.44%
Tax Equivalent 30-Day SEC Yield Tax Equivalent 30-Day SEC Yield4.19%
Fundamentals as of 9/2/2010
Weighted Average Maturity Weighted Average Maturity 6.60 yr
Weighted Average Coupon Weighted Average Coupon4.88%
Effective Duration Effective Duration 7.31
Standard Deviation (3 year) Standard Deviation
as of 7/30/2010
--
Profile as of 9/3/2010
Total Net Assets$2,164,241,607
Expense Ratio0.25%
Shares Outstanding20,300,000
Total Holdings
as of 9/2/2010
1008
Fund Credit Rating - S&P Fund Credit Rating - S&PA+f
Inception Date9/7/2007
Related IndexSPMUNUST
Net Asset Value
as of 9/3/2010
$106.61
  • $-0.19
  • -0.18%
Price
as of 9/3/2010
$106.61
  • $-0.25
  • -0.23%
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
Management Fees 0.25%
+
Acquired Fees & Expenses ‡ 0.00%
=
Total Annual Fund Operating Expenses 0.25%
Trading Information
TickerMUB
Related IndexSPMUNUST
NAVMUB.NV
Underlying Trading ValueMUB.IV
Shares OutstandingMUB.SO
Estimated CashMUB.EU
Total CashMUB.TC
CUSIP464288414
Credit Ratings as of 9/2/2010
S&P/Moody's
S&P Moody's
U.S. Gov't and Agency 0.00% 0.00%
AAA/Aaa 29.37% 12.73%
AA+/Aa1 7.64% 17.47%
AA/Aa2 16.58% 20.21%
AA-/Aa3 13.81% 16.16%
A+/A1 7.68% 13.43%
A/A2 7.12% 5.87%
A-/A3 9.55% 5.34%
BBB+/Baa1 2.40% 2.16%
BBB/Baa2 0.92% 0.20%
BBB-/Baa3 2.14% 1.11%
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%
CI/-- 0.00% --
R/-- 0.00% --
SD/-- 0.00% --
D/-- 0.00% --
Not Rated 2.20% 4.72%
Other 0.59% 0.59%
Agency and Government consists of securities that are issued by the U.S. Treasury or U.S. Government Agencies and are not rated by S&P or Moody's. "Other" applies to securities for which ratings are not available.

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 iShares Funds ("Funds") are distributed by SEI Investments Distribution Co. (SEI).

Bonds and bond funds will decrease in value as interest rates rise.

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.

A portion of the Fund's income may be subject to federal or state income taxes or the alternative minimum tax. Capital gains, if any, are subject to capital gains tax. Federal or state changes in income or alternative minimum tax rates or in the tax treatment of municipal bonds may make them less attractive as investments and cause them to lose value.

S&P and Standard & Poor's are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use by BlackRock Institutional Trust Company, N.A. iShares Funds are not sponsored, endorsed, issued, sold or promoted by Standard & Poor's. Nor does this company make any representation regarding the advisability of investing in iShares Funds. Index data source: Standard & Poors.

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.

©2010 BlackRock Institutional Trust Company, N.A. All rights reserved. iShares® is a registered trademark of BlackRock Institutional Trust Company, N.A. All other trademarks, servicemarks or registered trademarks are the property of their respective owners.

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