Form 485BPOS XBRL

0001193125-13-182752.txt : 20130430 0001193125-13-182752.hdr.sgml : 20130430 20130429181216 ACCESSION NUMBER: 0001193125-13-182752 CONFORMED SUBMISSION TYPE: 485BPOS PUBLIC DOCUMENT COUNT: 7 FILED AS OF DATE: 20130430 DATE AS OF CHANGE: 20130429 EFFECTIVENESS DATE: 20130430 FILER: COMPANY DATA: COMPANY CONFORMED NAME: iShares U.S. ETF Trust CENTRAL INDEX KEY: 0001524513 IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1933 Act SEC FILE NUMBER: 333-179904 FILM NUMBER: 13793550 BUSINESS ADDRESS: STREET 1: 400 HOWARD STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94105 BUSINESS PHONE: (415) 670-2000 MAIL ADDRESS: STREET 1: 400 HOWARD STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94105 FILER: COMPANY DATA: COMPANY CONFORMED NAME: iShares U.S. ETF Trust CENTRAL INDEX KEY: 0001524513 IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1940 Act SEC FILE NUMBER: 811-22649 FILM NUMBER: 13793551 BUSINESS ADDRESS: STREET 1: 400 HOWARD STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94105 BUSINESS PHONE: (415) 670-2000 MAIL ADDRESS: STREET 1: 400 HOWARD STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94105

0001524513 S000036359 iShares Enhanced U.S. Small-Cap ETF

C000111160 iShares Enhanced U.S. Small-Cap ETF IESM

485BPOS 1 d520286d485bpos.htm FORM 485BPOS XBRL Form 485BPOS XBRL

As filed with the U.S. Securities and Exchange Commission on April 29, 2013

Securities Act File No. 333-179904

Investment Company Act File No. 811-22649

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A


		REGISTRATION STATEMENT
		*UNDER*
		*THE SECURITIES ACT OF 1933*		x
		Pre-Effective Amendment No.
		Post-Effective Amendment No. 12		x
		and/or
		REGISTRATION STATEMENT
		*UNDER*
		*THE INVESTMENT COMPANY ACT OF 1940*		x
		Amendment No. 12		x

(Check appropriate box or boxes)

iShares U.S. ETF Trust

(Exact Name of Registrant as Specified in Charter)

c/o State Street Bank and Trust Company

200 Clarendon Street

Boston, MA 02116

(Address of Principal Executive Office)(Zip Code)

Registrant’s Telephone Number, including Area Code (415) 670-2000

The Corporation Trust Company

1209 Orange Street

Wilmington, DE 19801

(Name and Address of Agent for Service)

With Copies to:

MARGERY K. NEALE, ESQ.
WILLKIE FARR &
GALLAGHER LLP
787 SEVENTH AVENUE
NEW YORK, NY 10019-6099

BENJAMIN J. HASKIN, ESQ.
WILLKIE FARR &
GALLAGHER LLP
1875 K STREET, N.W.
WASHINGTON, D.C. 20006-1238

EDWARD BAER, ESQ.

BLACKROCK FUND

ADVISORS

400 HOWARD STREET

SAN FRANCISCO, CA 94105

Continuous

(April 29, 2013)

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on (date) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on (date) pursuant to paragraph (a)(2)

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This filing relates solely to the following Fund, a series of iShares U.S. ETF Trust:

iShares Enhanced U.S. Small-Cap ETF

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all the requirements for the effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment No. 12 to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of San Francisco and the State of California on the 29th day of April, 2013.

iSHARES U.S. ETF TRUST


By:
		Michael Latham*
		President and Trustee
		Date: April 29, 2013

Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 12 to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.



		Michael Latham* President and Trustee Date: April 29, 2013


		John E. Martinez*
		Trustee
		Date: April 29, 2013


		George G.C. Parker*
		Trustee
		Date: April 29, 2013


		Cecilia H. Herbert*
		Trustee
		Date: April 29, 2013


		Charles A. Hurty*
		Trustee
		Date: April 29, 2013


		John E. Kerrigan*
		Trustee
		Date: April 29, 2013


		Robert H. Silver*
		Trustee
		Date: April 29, 2013




		Robert S. Kapito*
		Trustee
		Date: April 29, 2013


		Madhav V. Rajan*
		Trustee
		Date: April 29, 2013

		/s/ Jack Gee
		Jack Gee
		Treasurer
		Date: April 29, 2013

*By:		/s/ Jack Gee
		Jack Gee Attorney-in-fact Date: April 29, 2013

Powers of Attorney, each dated December 6, 2011, for Michael A. Latham, Charles A. Hurty, Cecilia H. Herbert, John E. Kerrigan, Robert H. Silver, George G.C. Parker, John E. Martinez, Madhav V. Rajan and Robert S. Kapito are incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement, filed September 5, 2012.

EXHIBIT INDEX


Index No.		Description of Exhibit

EX-101.INS		XBRL Instance Document

EX-101.SCH		XBRL Taxonomy Extension Schema Document

EX-101.CAL		XBRL Taxonomy Extension Calculation Linkbase

EX-101.DEF		XBRL Taxonomy Extension Definition Linkbase

EX-101.LAB		XBRL Taxonomy Extension Labels Linkbase

EX-101.PRE		XBRL Taxonomy Extension Presentation Linkbase

EX-101.INS 2 isust-20130415.xml XBRL INSTANCE DOCUMENT 0001524513 isust:S000036359Member 2012-04-16 2013-04-15 0001524513 2012-04-16 2013-04-15 0001524513 isust:S000036359Member isust:C000111160Member 2012-04-16 2013-04-15 pure iso4217:USD <div style="display:none">~ http://www.ishares.com/role/ScheduleExpenseExampleTransposediSharesEnhancedU.S.Small-CapETF column period compact * ~</div> 485BPOS 2013-04-15 iShares U.S. ETF Trust 0001524513 false 2013-04-15 2013-04-15 2013-04-15 0.0035 0 0 0.0035 36 113 iSHARES® ENHANCED U.S. SMALL-CAP ETF Ticker: IESM                      Stock Exchange: NYSE Arca Investment Objective Fees and Expenses The following table describes the fees and expenses that you will incur if you own shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses. You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows: Annual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investments) Portfolio Turnover. The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. Example. This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be: Principal Investment Strategies The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in equity securities of U.S. small-capitalization issuers. The Fund is an actively managed exchange-traded fund ("ETF") that does not seek to replicate the performance of a specified index. The Fund will seek to invest in strategic U.S. small-capitalization stocks with targeted investment characteristics. BFA utilizes a proprietary investment process to assemble an investment portfolio from a defined group of U.S. small-capitalization stocks based on certain quantitative investment characteristics, including, but not limited to, cash earnings, earnings variability, leverage, price-to-book ratio and market capitalization. Companies in the universe of U.S. small-capitalization securities include consumer discretionary, financial and information technology companies, and may change over time. The Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index. The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received). Summary of Principal Risks As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return and ability to meet its investment objective. Unlike many ETFs, the Fund is not an index-based ETF. Asset Class Risk. Securities in the Fund's portfolio may underperform in comparison to the general securities markets, a particular securities market, or other asset classes. Consumer Discretionary Sector Risk. The consumer discretionary sector may be affected by changes in domestic and international economies, exchange and interest rates, competition, consumers' disposable income and consumer preferences, social trends and marketing campaigns. Equity Securities Risk. Equity securities are subject to changes in value and their values may be more volatile than other asset classes. Factor Risk. The Fund seeks to provide exposure to U.S. small-capitalization stocks that emphasize certain quantitative investment characteristics ("factors"), including, but not limited to, cash earnings, earnings variability, leverage, price-to-book ratio and market capitalization. There can be no assurance that exposure to such investment factors will enhance the Fund's performance over time. It is expected that exposure to such investment factors will detract from performance in some market environments, perhaps for extended periods. In such circumstances, BFA will seek to maintain exposure to the targeted investment factors and will not adjust the Fund's investment process to target different factors. Financial Sector Risk. Performance of companies in the financial sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. High Portfolio Turnover Risk. The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (higher than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities. Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by loss or impairment of those rights. Investment Exposure Risk. The Fund is designed to consider targeted investment factors. BFA will not attempt to consider different factors or take defensive positions under any market conditions, including declining markets. Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. Changes in the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. There is no guarantee that an issuer that paid dividends in the past will continue to do so in the future or will continue paying dividends at the same level. Management Risk. The Fund is subject to management risk, which is the risk that the investment process, techniques and risk analyses applied by BFA will not produce the desired results, and that securities selected by BFA may underperform the market or any relevant benchmark. In addition, legislative, regulatory, or tax developments may affect the investment techniques available to BFA in connection with managing the Fund and may also adversely affect the ability of the Fund to achieve its investment objective. Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns. Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. Unlike some ETFs that track specific indexes, the Fund does not seek to replicate the performance of a specified index. Index-based ETFs have generally traded at prices that closely correspond to NAV. Given the high level of transparency of the Fund's holdings, BFA believes that the trading experience of the Fund should be similar to that of index-based ETFs. However, ETFs that do not seek to replicate the performance of a specified index have a limited trading history and, therefore, there can be no assurance as to whether, and/or the extent to which, the Fund's shares will trade at premiums or discounts to NAV. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV. Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of the collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund. Small-Capitalization Companies Risk. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments, and their securities may be more volatile and less liquid. Value Securities Risk. Securities issued by companies that may be perceived as undervalued may fail to appreciate for long periods of time and may never realize their full potential value. Performance Information As of the date of the Fund's prospectus (the “Prospectus”), the Fund has been in operation for less than one full calendar year and therefore does not report its performance information. You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows: As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. As of the date of the Fund's prospectus (the “Prospectus”), the Fund has been in operation for less than one full calendar year and therefore does not report its performance information. <div style="display:none">~ http://www.ishares.com/role/ScheduleAnnualFundOperatingExpensesTransposediSharesEnhancedUSSmallCapETF column period compact * ~</div> The iShares Enhanced U.S. Small-Cap ETF (the “Fund”) seeks long-term capital appreciation. 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iShares Enhanced U.S. Small-Cap ETF

iSHARES^® ENHANCED U.S. SMALL-CAP ETF

Ticker: IESM Stock Exchange: NYSE Arca

Investment Objective

The iShares Enhanced U.S. Small-Cap ETF (the “Fund”) seeks long-term capital appreciation.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you own shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses.

You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows:

Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Annual Fund Operating Expenses

Management Fees

Distribution and Service (12b-1) Fees

Other Expenses

Total Annual Fund Operating Expenses

iShares Enhanced U.S. Small-Cap ETF
0.35% none none 0.35%

Example.

This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)

1 Year

3 Years

iShares Enhanced U.S. Small-Cap ETF
36 113

Portfolio Turnover.

The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in equity securities of U.S. small-capitalization issuers. The Fund is an actively managed exchange-traded fund ("ETF") that does not seek to replicate the performance of a specified index. The Fund will seek to invest in strategic U.S. small-capitalization stocks with targeted investment characteristics.

BFA utilizes a proprietary investment process to assemble an investment portfolio from a defined group of U.S. small-capitalization stocks based on certain quantitative investment characteristics, including, but not limited to, cash earnings, earnings variability, leverage, price-to-book ratio and market capitalization. Companies in the universe of U.S. small-capitalization securities include consumer discretionary, financial and information technology companies, and may change over time.

The Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return and ability to meet its investment objective. Unlike many ETFs, the Fund is not an index-based ETF.

Asset Class Risk. Securities in the Fund's portfolio may underperform in comparison to the general securities markets, a particular securities market, or other asset classes.

Consumer Discretionary Sector Risk. The consumer discretionary sector may be affected by changes in domestic and international economies, exchange and interest rates, competition, consumers' disposable income and consumer preferences, social trends and marketing campaigns.

Equity Securities Risk. Equity securities are subject to changes in value and their values may be more volatile than other asset classes.

Factor Risk. The Fund seeks to provide exposure to U.S. small-capitalization stocks that emphasize certain quantitative investment characteristics ("factors"), including, but not limited to, cash earnings, earnings variability, leverage, price-to-book ratio and market capitalization. There can be no assurance that exposure to such investment factors will enhance the Fund's performance over time. It is expected that exposure to such investment factors will detract from performance in some market environments, perhaps for extended periods. In such circumstances, BFA will seek to maintain exposure to the targeted investment factors and will not adjust the Fund's investment process to target different factors.

Financial Sector Risk. Performance of companies in the financial sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted.

High Portfolio Turnover Risk. The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (higher than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities.

Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by loss or impairment of those rights.

Investment Exposure Risk. The Fund is designed to consider targeted investment factors. BFA will not attempt to consider different factors or take defensive positions under any market conditions, including declining markets.

Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. Changes in the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. There is no guarantee that an issuer that paid dividends in the past will continue to do so in the future or will continue paying dividends at the same level.

Management Risk. The Fund is subject to management risk, which is the risk that the investment process, techniques and risk analyses applied by BFA will not produce the desired results, and that securities selected by BFA may underperform the market or any relevant benchmark. In addition, legislative, regulatory, or tax developments may affect the investment techniques available to BFA in connection with managing the Fund and may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. Unlike some ETFs that track specific indexes, the Fund does not seek to replicate the performance of a specified index. Index-based ETFs have generally traded at prices that closely correspond to NAV. Given the high level of transparency of the Fund's holdings, BFA believes that the trading experience of the Fund should be similar to that of index-based ETFs. However, ETFs that do not seek to replicate the performance of a specified index have a limited trading history and, therefore, there can be no assurance as to whether, and/or the extent to which, the Fund's shares will trade at premiums or discounts to NAV. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of the collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.

Small-Capitalization Companies Risk. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments, and their securities may be more volatile and less liquid.

Value Securities Risk. Securities issued by companies that may be perceived as undervalued may fail to appreciate for long periods of time and may never realize their full potential value.

Performance Information

As of the date of the Fund's prospectus (the “Prospectus”), the Fund has been in operation for less than one full calendar year and therefore does not report its performance information.

XML 11 R6.htm IDEA: XBRL DOCUMENT

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	iShares U.S. ETF Trust
Prospectus Date	rr_ProspectusDate	Apr. 15, 2013
Document Creation Date	dei_DocumentCreationDate	Apr. 15, 2013

XML 12 Show.js IDEA: XBRL DOCUMENT /** * Rivet Software Inc. * * @copyright Copyright (c) 2006-2011 Rivet Software, Inc. All rights reserved. * Version 2.1.0.1 * */ var moreDialog = null; var Show = { Default:'raw', more:function( obj ){ var bClosed = false; if( moreDialog != null ) { try { bClosed = moreDialog.closed; } catch(e) { //Per article at http://support.microsoft.com/kb/244375 there is a problem with the WebBrowser control // that somtimes causes it to throw when checking the closed property on a child window that has been //closed. So if the exception occurs we assume the window is closed and move on from there. bClosed = true; } if( !bClosed ){ moreDialog.close(); } } obj = obj.parentNode.getElementsByTagName( 'pre' )[0]; var hasHtmlTag = false; var objHtml = ''; var raw = ''; //Check for raw HTML var nodes = obj.getElementsByTagName( '*' ); if( nodes.length ){ objHtml = obj.innerHTML; }else{ if( obj.innerText ){ raw = obj.innerText; }else{ raw = obj.textContent; } var matches = raw.match( /<\/?[a-zA-Z]{1}\w*[^>]*>/g ); if( matches && matches.length ){ objHtml = raw; //If there is an html node it will be 1st or 2nd, // but we can check a little further. var n = Math.min( 5, matches.length ); for( var i = 0; i < n; i++ ){ var el = matches[ i ].toString().toLowerCase(); if( el.indexOf( '= 0 ){ hasHtmlTag = true; break; } } } } if( objHtml.length ){ var html = ''; if( hasHtmlTag ){ html = objHtml; }else{ html = ''+ "\n"+''+ "\n"+' Report Preview Details'+ "\n"+' '+ "\n"+''+ "\n"+''+ objHtml + "\n"+''+ "\n"+''; } moreDialog = window.open("","More","width=700,height=650,status=0,resizable=yes,menubar=no,toolbar=no,scrollbars=yes"); moreDialog.document.write( html ); moreDialog.document.close(); if( !hasHtmlTag ){ moreDialog.document.body.style.margin = '0.5em'; } } else { //default view logic var lines = raw.split( "\n" ); var longest = 0; if( lines.length > 0 ){ for( var p = 0; p < lines.length; p++ ){ longest = Math.max( longest, lines[p].length ); } } //Decide on the default view this.Default = longest < 120 ? 'raw' : 'formatted'; //Build formatted view var text = raw.split( "\n\n" ) >= raw.split( "\r\n\r\n" ) ? raw.split( "\n\n" ) : raw.split( "\r\n\r\n" ) ; var formatted = ''; if( text.length > 0 ){ if( text.length == 1 ){ text = raw.split( "\n" ) >= raw.split( "\r\n" ) ? raw.split( "\n" ) : raw.split( "\r\n" ) ; formatted = "

"+ text.join( "

\n" ) +"

"; }else{ for( var p = 0; p < text.length; p++ ){ formatted += "

" + text[p] + "

\n"; } } }else{ formatted = '

' + raw + '

'; } html = ''+ "\n"+''+ "\n"+' Report Preview Details'+ "\n"+' '+ "\n"+''+ "\n"+''+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+' '+ "\n"+'

'+ "\n"+' formatted: '+ ( this.Default == 'raw' ? 'as Filed' : 'with Text Wrapped' ) +''+ "\n"+'

'+ "\n"+' '+ "\n"+'

'+ "\n"+'

'+raw+'

'+ "\n"+'

'+ "\n"+''+ "\n"+''; moreDialog = window.open("","More","width=700,height=650,status=0,resizable=yes,menubar=no,toolbar=no,scrollbars=yes"); moreDialog.document.write(html); moreDialog.document.close(); this.toggle( moreDialog ); } moreDialog.document.title = 'Report Preview Details'; }, toggle:function( win, domLink ){ var domId = this.Default; var doc = win.document; var domEl = doc.getElementById( domId ); domEl.style.display = 'block'; this.Default = domId == 'raw' ? 'formatted' : 'raw'; if( domLink ){ domLink.innerHTML = this.Default == 'raw' ? 'with Text Wrapped' : 'as Filed'; } var domElOpposite = doc.getElementById( this.Default ); domElOpposite.style.display = 'none'; }, LastAR : null, showAR : function ( link, id, win ){ if( Show.LastAR ){ Show.hideAR(); } var ref = link; do { ref = ref.nextSibling; } while (ref && ref.nodeName != 'TABLE'); if (!ref || ref.nodeName != 'TABLE') { var tmp = win ? win.document.getElementById(id) : document.getElementById(id); if( tmp ){ ref = tmp.cloneNode(true); ref.id = ''; link.parentNode.appendChild(ref); } } if( ref ){ ref.style.display = 'block'; Show.LastAR = ref; } }, toggleNext : function( link ){ var ref = link; do{ ref = ref.nextSibling; }while( ref.nodeName != 'DIV' ); if( ref.style && ref.style.display && ref.style.display == 'none' ){ ref.style.display = 'block'; if( link.textContent ){ link.textContent = link.textContent.replace( '+', '-' ); }else{ link.innerText = link.innerText.replace( '+', '-' ); } }else{ ref.style.display = 'none'; if( link.textContent ){ link.textContent = link.textContent.replace( '-', '+' ); }else{ link.innerText = link.innerText.replace( '-', '+' ); } } }, hideAR : function(){ Show.LastAR.style.display = 'none'; } } XML 13 R1.htm IDEA: XBRL DOCUMENT

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Apr. 15, 2013
Registrant Name	dei_EntityRegistrantName	iShares U.S. ETF Trust
Central Index Key	dei_EntityCentralIndexKey	0001524513
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 15, 2013
Document Effective Date	dei_DocumentEffectiveDate	Apr. 15, 2013
Prospectus Date	rr_ProspectusDate	Apr. 15, 2013

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Label Element Value

Risk/Return: rr_RiskReturnAbstract

Registrant Name dei_EntityRegistrantName iShares U.S. ETF Trust

Prospectus Date rr_ProspectusDate Apr. 15, 2013

iShares Enhanced U.S. Small-Cap ETF

Risk/Return: rr_RiskReturnAbstract

Risk/Return [Heading] rr_RiskReturnHeading iSHARES^® ENHANCED U.S. SMALL-CAP ETF

Ticker: IESM Stock Exchange: NYSE Arca

Objective [Heading] rr_ObjectiveHeading Investment Objective

Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The iShares Enhanced U.S. Small-Cap ETF (the “Fund”) seeks long-term capital appreciation.

Expense [Heading] rr_ExpenseHeading Fees and Expenses

Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you will incur if you own shares of the Fund. The investment advisory agreement between iShares U.S. ETF Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except interest expenses, taxes, brokerage expenses, future distribution fees or expenses, and extraordinary expenses.

You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows:

Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses
(ongoing expenses that you pay each year as a
percentage of the value of your investments)

Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.

Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also incur usual and customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the example that follows:

Expense Example [Heading] rr_ExpenseExampleHeading Example.

Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies

Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in equity securities of U.S. small-capitalization issuers. The Fund is an actively managed exchange-traded fund ("ETF") that does not seek to replicate the performance of a specified index. The Fund will seek to invest in strategic U.S. small-capitalization stocks with targeted investment characteristics.

BFA utilizes a proprietary investment process to assemble an investment portfolio from a defined group of U.S. small-capitalization stocks based on certain quantitative investment characteristics, including, but not limited to, cash earnings, earnings variability, leverage, price-to-book ratio and market capitalization. Companies in the universe of U.S. small-capitalization securities include consumer discretionary, financial and information technology companies, and may change over time.

The Fund may have a higher portfolio turnover than funds that seek to replicate the performance of an index.

The Fund may lend securities representing up to one-third of the value of the Fund's total assets (including the value of the collateral received).

Risk [Heading] rr_RiskHeading Summary of Principal Risks

Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any investment, you could lose all or part of your investment in the Fund, and the Fund's performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund's net asset value per share ("NAV"), trading price, yield, total return and ability to meet its investment objective. Unlike many ETFs, the Fund is not an index-based ETF.

Asset Class Risk. Securities in the Fund's portfolio may underperform in comparison to the general securities markets, a particular securities market, or other asset classes.

Consumer Discretionary Sector Risk. The consumer discretionary sector may be affected by changes in domestic and international economies, exchange and interest rates, competition, consumers' disposable income and consumer preferences, social trends and marketing campaigns.

Equity Securities Risk. Equity securities are subject to changes in value and their values may be more volatile than other asset classes.

Factor Risk. The Fund seeks to provide exposure to U.S. small-capitalization stocks that emphasize certain quantitative investment characteristics ("factors"), including, but not limited to, cash earnings, earnings variability, leverage, price-to-book ratio and market capitalization. There can be no assurance that exposure to such investment factors will enhance the Fund's performance over time. It is expected that exposure to such investment factors will detract from performance in some market environments, perhaps for extended periods. In such circumstances, BFA will seek to maintain exposure to the targeted investment factors and will not adjust the Fund's investment process to target different factors.

Financial Sector Risk. Performance of companies in the financial sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted.

High Portfolio Turnover Risk. The Fund may engage in active and frequent trading of its portfolio securities. High portfolio turnover (higher than 100%) may result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities.

Information Technology Sector Risk. Information technology companies face intense competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by loss or impairment of those rights.

Investment Exposure Risk. The Fund is designed to consider targeted investment factors. BFA will not attempt to consider different factors or take defensive positions under any market conditions, including declining markets.

Issuer Risk. Fund performance depends on the performance of individual securities to which the Fund has exposure. Changes in the financial condition or credit rating of an issuer of those securities may cause the value of the securities to decline. There is no guarantee that an issuer that paid dividends in the past will continue to do so in the future or will continue paying dividends at the same level.

Management Risk. The Fund is subject to management risk, which is the risk that the investment process, techniques and risk analyses applied by BFA will not produce the desired results, and that securities selected by BFA may underperform the market or any relevant benchmark. In addition, legislative, regulatory, or tax developments may affect the investment techniques available to BFA in connection with managing the Fund and may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. Unlike some ETFs that track specific indexes, the Fund does not seek to replicate the performance of a specified index. Index-based ETFs have generally traded at prices that closely correspond to NAV. Given the high level of transparency of the Fund's holdings, BFA believes that the trading experience of the Fund should be similar to that of index-based ETFs. However, ETFs that do not seek to replicate the performance of a specified index have a limited trading history and, therefore, there can be no assurance as to whether, and/or the extent to which, the Fund's shares will trade at premiums or discounts to NAV. ANY OF THESE FACTORS, AMONG OTHERS, MAY LEAD TO THE FUND'S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the Fund's loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of the collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.

Small-Capitalization Companies Risk. Compared to mid- and large-capitalization companies, small-capitalization companies may be less stable and more susceptible to adverse developments, and their securities may be more volatile and less liquid.

Value Securities Risk. Securities issued by companies that may be perceived as undervalued may fail to appreciate for long periods of time and may never realize their full potential value.

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iShares Enhanced U.S. Small-Cap ETF | iShares Enhanced U.S. Small-Cap ETF

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