BlackRock LifePath Index 2020-2060 Fund

0001193125-17-359867.txt : 20171204 0001193125-17-359867.hdr.sgml : 20171204 20171204120505 ACCESSION NUMBER: 0001193125-17-359867 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 16 FILED AS OF DATE: 20171204 DATE AS OF CHANGE: 20171204 EFFECTIVENESS DATE: 20171204 FILER: COMPANY DATA: COMPANY CONFORMED NAME: BlackRock Funds III CENTRAL INDEX KEY: 0000893818 IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 497 SEC ACT: 1933 Act SEC FILE NUMBER: 033-54126 FILM NUMBER: 171236297 BUSINESS ADDRESS: STREET 1: 400 HOWARD STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94105 BUSINESS PHONE: 8006439691 MAIL ADDRESS: STREET 1: 400 HOWARD STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94105 FORMER COMPANY: FORMER CONFORMED NAME: BARCLAYS GLOBAL INVESTORS FUNDS DATE OF NAME CHANGE: 20060201 FORMER COMPANY: FORMER CONFORMED NAME: BARCLAYS GLOBAL INVESTORS FUNDS INC DATE OF NAME CHANGE: 19990804 FORMER COMPANY: FORMER CONFORMED NAME: MASTERWORKS FUNDS INC DATE OF NAME CHANGE: 19960607

0000893818 S000032776 BLACKROCK LIFEPATH INDEX 2020 FUND

C000101137 Investor A

C000101138 Institutional Shares

C000101139 Class K Shares

0000893818 S000032777 BLACKROCK LIFEPATH INDEX 2025 FUND

C000101140 Investor A

C000101141 Institutional Shares

C000101142 Class K Shares

0000893818 S000032778 BLACKROCK LIFEPATH INDEX 2030 FUND

C000101143 Investor A

C000101144 Institutional Shares

C000101145 Class K Shares

0000893818 S000032779 BLACKROCK LIFEPATH INDEX 2035 FUND

C000101146 Investor A

C000101147 Institutional Shares

C000101148 Class K Shares

0000893818 S000032780 BLACKROCK LIFEPATH INDEX 2040 FUND

C000101149 Investor A

C000101150 Institutional Shares

C000101151 Class K Shares

0000893818 S000032781 BLACKROCK LIFEPATH INDEX 2045 FUND

C000101152 Investor A

C000101153 Institutional Shares

C000101154 Class K Shares

0000893818 S000032782 BLACKROCK LIFEPATH INDEX 2050 FUND

C000101155 Investor A

C000101156 Institutional Shares

C000101157 Class K Shares

0000893818 S000032783 BLACKROCK LIFEPATH INDEX 2055 FUND

C000101158 Investor A

C000101159 Institutional Shares

C000101160 Class K Shares

0000893818 S000052849 BlackRock LifePath Index 2060 Fund

C000166217 Investor A

C000166218 Institutional

C000166219 Class K

497 1 d471851d497.htm BLACKROCK LIFEPATH INDEX 2020-2060 FUND BlackRock LifePath Index 2020-2060 Fund

LOGO

SIDLEY AUSTIN LLP

787 SEVENTH AVENUE

NEW YORK, NY 10019

+1 212 839 5300

+1 212 839 5599 FAX

AMERICA • ASIA PACIFIC • EUROPE

December 4, 2017

VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention: Division of Investment Management

Re:

BlackRock LifePath^® Index 2020 Fund, BlackRock LifePath^® Index 2025 Fund, BlackRock LifePath^® Index 2030 Fund, BlackRock LifePath^® Index 2035 Fund, BlackRock LifePath^® Index 2040 Fund, BlackRock LifePath^® Index 2045 Fund, BlackRock LifePath^® Index 2050 Fund, BlackRock LifePath^® Index 2055 Fund and BlackRock LifePath^®Index 2060 Fund (the “Funds”), each a series of BlackRock Funds III

(Securities Act File No. 33-54126, Investment Company Act File No. 811-07332)

Ladies and Gentlemen:

On behalf of BlackRock Funds III, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Supplement to the Summary Prospectuses and Prospectuses, each dated April 28, 2017, of the Funds, as filed pursuant to Rule 497(e) under the Securities Act of 1933 on November 9, 2017 (the “497 Filing”). The purpose of this filing is to submit the 497 Filing in XBRL for the Funds.

Any questions or comments on the 497 Filing should be directed to the undersigned at (212) 839-8615.

Very truly yours,

/s/ Jesse C. Kean

Jesse C. Kean

cc:	Benjamin Archibald

John A. MacKinnon

Sidley Austin (NY) LLP is a Delaware limited liability partnership doing business as Sidley Austin LLP and practicing in affiliation with other Sidley Austin partnerships.

EX-101.INS 2 bf3-20171109.xml XBRL INSTANCE DOCUMENT 0000893818 2017-04-28 2017-04-28 0000893818 bf3:S000032776Member 2017-04-28 2017-04-28 0000893818 bf3:S000032777Member 2017-04-28 2017-04-28 0000893818 bf3:S000032778Member 2017-04-28 2017-04-28 0000893818 bf3:S000032779Member 2017-04-28 2017-04-28 0000893818 bf3:S000032780Member 2017-04-28 2017-04-28 0000893818 bf3:S000032781Member 2017-04-28 2017-04-28 0000893818 bf3:S000032782Member 2017-04-28 2017-04-28 0000893818 bf3:S000032783Member 2017-04-28 2017-04-28 0000893818 bf3:S000052849Member 2017-04-28 2017-04-28 2017-04-28 497 2016-12-31 BlackRock Funds III 0000893818 false 2017-11-09 2017-11-09 BLACKROCK FUNDS III BlackRock LifePath® Index 2020 Fund BlackRock LifePath® Index 2025 Fund BlackRock LifePath® Index 2030 Fund BlackRock LifePath® Index 2035 Fund BlackRock LifePath® Index 2040 Fund BlackRock LifePath® Index 2045 Fund BlackRock LifePath® Index 2050 Fund BlackRock LifePath® Index 2055 Fund BlackRock LifePath® Index 2060 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2020 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2025 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2030 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2035 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2040 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2045 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2050 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2055 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> BLACKROCK FUNDS III BlackRock LifePath® Index 2060 Fund (each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”) Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses: The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] Principal Investment Strategies of the Fund”: The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:  <table width="100%" align="center" style=" border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"><tr><td width="34%"></td><td width="14%" valign="bottom"></td><td></td><td></td><td></td><td width="18%" valign="bottom"></td><td></td><td></td><td></td><td width="16%" valign="bottom"></td><td></td><td></td><td></td></tr><tr style=" break-inside: avoid;"><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">Name of Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Years Until Retirement</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Equity Index Funds (includes REITs)</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td align="center" valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;" colspan="2">Fixed-Income Index Funds</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2060 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">43</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2055 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">38</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2050 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">33</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">99</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">1</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2045 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">97</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2040 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">23</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">91</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">9</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2035 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">82</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">18</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2030 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">13</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">72</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">28</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;"><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2025 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">8</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">61</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">39</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index 2020 Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">3</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">49</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">51</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr><tr style=" break-inside: avoid;" ><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">BlackRock LifePath® Index Retirement Fund</td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">  </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">0</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">40</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td><td valign="bottom" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">    </td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;"> </td><td align="right" valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">60</td><td valign="top" style="border-bottom-color: rgb(0, 0, 0); border-bottom-width: 1px; border-bottom-style: solid;">% </td></tr></table> EX-101.SCH 3 bf3-20171109.xsd XBRL TAXONOMY EXTENSION SCHEMA 000000 - Document - Document and Entity Information {Elements} link:presentationLink link:calculationLink link:definitionLink 000011 - Document - Risk/Return Supplement {Unlabeled} - BlackRock Funds III link:presentationLink link:calculationLink link:definitionLink 000019 - Disclosure - Risk/Return Detail Data {Elements} - BlackRock Funds III link:presentationLink link:calculationLink link:definitionLink EX-101.DEF 4 bf3-20171109_def.xml XBRL TAXONOMY EXTENSION DEFINITION LINKBASE EX-101.LAB 5 bf3-20171109_lab.xml XBRL TAXONOMY EXTENSION LABEL LINKBASE Prospectus: Risk/Return: Document Type Document Period End Date Registrant Name Central Index Key Amendment Flag Document Creation Date Document Effective Date Prospectus Date Legal Entity Identifier Amendment Description Trading Symbol Supplement Text Block Supplement [Text Block] Supplement [Text Block] Document [Axis] Prospectus Series [Axis] Series S000032776 [Member] BLACKROCK LIFEPATH INDEX 2020 FUND BLACKROCK LIFEPATH INDEX 2020 FUND Member S000032777 [Member] BLACKROCK LIFEPATH INDEX 2025 FUND BLACKROCK LIFEPATH INDEX 2025 FUND Member S000032778 [Member] BLACKROCK LIFEPATH INDEX 2030 FUND BLACKROCK LIFEPATH INDEX 2030 FUND Member S000032779 [Member] BLACKROCK LIFEPATH INDEX 2035 FUND BLACKROCK LIFEPATH INDEX 2035 FUND Member S000032780 [Member] BLACKROCK LIFEPATH INDEX 2040 FUND BLACKROCK LIFEPATH INDEX 2040 FUND Member S000032781 [Member] BLACKROCK LIFEPATH INDEX 2045 FUND BLACKROCK LIFEPATH INDEX 2045 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Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 2016
Registrant Name	dei_EntityRegistrantName	BlackRock Funds III
Central Index Key	dei_EntityCentralIndexKey	0000893818
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Nov. 09, 2017
Document Effective Date	dei_DocumentEffectiveDate	Nov. 09, 2017
Prospectus Date	rr_ProspectusDate	Apr. 28, 2017

XML 9 R2.htm IDEA: XBRL DOCUMENT

Apr. 28, 2017

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2020 Fund

BlackRock LifePath^® Index 2025 Fund

BlackRock LifePath^® Index 2030 Fund

BlackRock LifePath^® Index 2035 Fund

BlackRock LifePath^® Index 2040 Fund

BlackRock LifePath^® Index 2045 Fund

BlackRock LifePath^® Index 2050 Fund

BlackRock LifePath^® Index 2055 Fund

BlackRock LifePath^® Index 2060 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following is added immediately after the chart in the sections of each Prospectus entitled “Fund Overview — Key Facts About [the LifePath Index Fund] — Principal Investment Strategies of the Fund,” as applicable, and the section of each Summary Prospectus entitled “Key Facts About [the LifePath Index Fund] — Principal Investment Strategies of the Fund”:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

XML 10 R3.htm IDEA: XBRL DOCUMENT

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BlackRock Funds III

Prospectus Date

rr_ProspectusDate

Apr. 28, 2017

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2020 Fund

BlackRock LifePath^® Index 2025 Fund

BlackRock LifePath^® Index 2030 Fund

BlackRock LifePath^® Index 2035 Fund

BlackRock LifePath^® Index 2040 Fund

BlackRock LifePath^® Index 2045 Fund

BlackRock LifePath^® Index 2050 Fund

BlackRock LifePath^® Index 2055 Fund

BlackRock LifePath^® Index 2060 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2020 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2020 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2025 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2025 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2030 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2030 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2035 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2035 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2040 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2040 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2045 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2045 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2050 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2050 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BLACKROCK LIFEPATH INDEX 2055 FUND

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2055 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

BlackRock LifePath Index 2060 Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

bf3_SupplementTextBlock

BLACKROCK FUNDSIII

BlackRock LifePath^® Index 2060 Fund

(each, a “LifePath Index Fund” and collectively, the “LifePath Index Funds”)

Supplement dated November 9, 2017 to the Summary Prospectuses and Prospectuses of the LifePath Index Funds, each dated April 28, 2017, as supplemented to date

Effective immediately, the following changes are made to the LifePath Index Funds’ Prospectuses and Summary Prospectuses:

The following table lists the years until retirement and the target allocation among asset classes for each of the LifePath Index Funds as set out in the above chart:


Name of Fund	Years Until Retirement		Equity Index Funds (includes REITs)			Fixed-Income Index Funds
BlackRock LifePath^® Index 2060 Fund		43		99	%		1	%
BlackRock LifePath^® Index 2055 Fund		38		99	%		1	%
BlackRock LifePath^® Index 2050 Fund		33		99	%		1	%
BlackRock LifePath^® Index 2045 Fund		28		97	%		3	%
BlackRock LifePath^® Index 2040 Fund		23		91	%		9	%
BlackRock LifePath^® Index 2035 Fund		18		82	%		18	%
BlackRock LifePath^® Index 2030 Fund		13		72	%		28	%
BlackRock LifePath^® Index 2025 Fund		8		61	%		39	%
BlackRock LifePath^® Index 2020 Fund		3		49	%		51	%
BlackRock LifePath^® Index Retirement Fund		0		40	%		60	%

XML 11 R4.htm IDEA: XBRL DOCUMENT

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BlackRock Funds III
Prospectus Date	rr_ProspectusDate	Apr. 28, 2017
Document Creation Date	dei_DocumentCreationDate	Nov. 09, 2017

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