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SEC Company Response from VANGUARD INSTITUTIONAL INDEX FUNDS (CIK 0000862084) — Apr 22, 2005

VANGUARD INSTITUTIONAL INDEX FUNDS (CIK 0000862084)
Date: April 22, 2005 · CIK: 0000862084 · Accession: 0000932471-05-000735

AI Filing Summary & Sentiment

Date
April 22, 2005
Author
Associate Counsel
Form
CORRESP
Company
VANGUARD INSTITUTIONAL INDEX FUNDS (CIK 0000862084)

Letter

[SHIP] [VANGUARD LOGO] April 22, 2005 Christian Sandoe, Esq. Division of Investment Management U.S. Securities and Exchange Commission VIA E-MAIL 450 Fifth Street, N.W., Fifth Floor Washington, D.C. 20549

RE: VANGUARD INSTITUTIONAL INDEX FUND (THE "TRUST"); FILE NO. 33-34494

Dear Mr. Sandoe:

Thank you for your comments of April 14, 2005 regarding the Trust's 39th Post-Effective Amendment to the Registration Statement that was filed on February 28, 2005 pursuant to Rule 485(a). The following are our responses to each of your comments. Each prospectus page reference is to the Institutional Shares and Institutional Plus Shares version of the prospectus.

Comment 1: ADDITION OF MID-CAP RISK IN INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND (PAGE 3)

Comment: If the Institutional Total Stock Market Index Fund (the "Stock Fund") invests in mid-cap stocks, move mid-cap risk disclosure to the Primary Risks section of the prospectus.

Response: Item 2 of Form N-1A requires a summary of "the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject" (emphasis added). This requires disclosure of the risks of a fund's overall portfolio, not every risk associated with each type of security held by the fund. The Commission's approach to risk disclosure is succinctly summarized in the 1998 release adopting sweeping revisions to Form N-1A (Investment Company Act Release No. 23064 (March 13, 1998). Part II.A.3.b of the release states "disclosure about the risks associated with each type of security in which the fund may invest does not effectively communicate to [investors] the overall risks of investing in the fund. In the Commission's view, disclosing the risks of each possible portfolio investment, rather than the overall risks of investing in a fund, does not help investors evaluate a particular fund or compare the risks of the fund with those of other funds."

<PAGE>

Mr. Christian Sandoe April 22, 2005 Page 2 of 3

Applying the Commission's position to the Stock Fund, we conclude that disclosing mid-cap risk in Item 2 would not effectively communicate the overall risks of investing in the Stock Fund. The risk of investing in funds focused on mid- or small-cap stocks is that their returns can be more volatile than the returns of funds investing in large-cap stocks. This risk, however, is not significant for the Stock Fund for two primary reasons. First, large-capitalization stocks constitute the preponderance of the Stock Fund's assets. Second, the Stock Fund's limited exposure to mid-and small-cap stocks is spread across the whole universe of domestic stocks. The result of this diversification is to limit sector-specific and stock-specific risk, including mid-cap risk.

The modest, and broad, exposure to mid- and small-cap stocks actually served to reduce the volatility of returns. For the 36-month period ended March 31, 2005, the Stock Fund had a beta of 1.00 versus the Dow Jones Wilshire 5000 Composite Index (i.e., matched the volatility exactly). Relative to the S&P 500 Index, the Stock Fund's beta was 0.98% (i.e., slightly less volatile than the large-cap-only S&P 500 Index).

Highlighting the potential volatility of a relatively small portion of the Stock Fund's holdings in the Primary Risks section of the prospectus would be inappropriate, potentially misleading, and contrary to the intent of the Commission.

COMMENT 2: INVESTMENT ADVISOR CLARIFICATION (PAGE 36)

Comment: In the Investment Advisor section of the prospectus, better clarify that George Sauter oversees, rather than does the day-to-day management, of the Funds within the Trust.

Response: We believe that the disclosure is clear as written. The paragraph describing Mr. Sauter states that he is responsible for the "oversight of approximately $530 billion managed by Vanguard's Quantitative Equity and Fixed Income Groups." Furthermore, the introduction to the "Plain Talk About The Funds' Portfolio Managers" clearly states that the individuals listed in the highlighted "Plain Talk" box are "primarily responsible for the day-to-day management of the Funds' portfolios." In light of our clear statements about the roles of each individual, we do not believe that it is necessary to state that Mr. Sauter does not have day-to-day management responsibilities for the Funds.

COMMENT 3: REVISE BOARD REVIEW OF ADVISORY CONTRACTS (PAGE B-29 IN THE STATEMENT OF ADDITIONAL INFORMATION ("SAI"))

Comment: Add disclosure to the SAI that relates the factors considered by each Fund's board in reviewing investment advisory agreements to the particulars of each Fund, pursuant to Item 12(b)(10) of Form N-1A.

<PAGE>

Mr. Christian Sandoe April 22, 2005 Page 3 of 3

Response: Item 12(b)(10) requires funds to "discuss in reasonable detail the material factors and the conclusions with respect thereto that formed the basis for the board of directors approving the existing investment advisory contract." We have revised our existing disclosure regarding board approval of investment advisory agreements.

We propose to revise the relevant SAI disclosure as indicated in Appendix A to this letter. Please note that the proposed disclosure in Appendix A is subject to editorial revision and completion.

COMMENT 4: TANDY REQUIREMENTS

Comment: The SEC is now requiring all registrants to provide at the end of response letters to registration statement comments, the following statements:

o Each Fund is responsible for the adequacy and accuracy of the disclosure in the filing.

o Staff comments or changes in response to staff comments in the filings reviewed by the staff do not foreclose the Commission from taking any action with respect to the filing.

o Each Fund may not assert staff comments as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States.

Response: As required by the SEC, we will provide the foregoing acknowledgements.

* * * * *

As required by the SEC, the Funds acknowledge that:

o The Funds are responsible for the adequacy and accuracy of the disclosure in the filing.

o Staff comments or changes in response to staff comments in the filings reviewed by the staff do not foreclose the Commission from taking any action with respect to the filing.

o The Funds may not assert staff comments as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States.

Please call me at (610) 669-5284 if you have any further questions.

Sincerely,
Lisa L. B. Matson
Associate Counsel
The Vanguard Group, Inc.

Show Raw Text
<DOCUMENT>
<TYPE>CORRESP
<SEQUENCE>1
<FILENAME>filename1.txt
<TEXT>
                                [SHIP] [VANGUARD LOGO]

                                 April 22, 2005

Christian Sandoe, Esq.
Division of Investment Management
U.S. Securities and Exchange Commission                         VIA E-MAIL
450 Fifth Street, N.W., Fifth Floor
Washington, D.C. 20549

RE:  VANGUARD INSTITUTIONAL INDEX FUND (THE "TRUST"); FILE NO. 33-34494

Dear Mr. Sandoe:

     Thank you for your  comments of April 14, 2005  regarding  the Trust's 39th
Post-Effective  Amendment  to the  Registration  Statement  that  was  filed  on
February 28, 2005  pursuant to Rule 485(a).  The  following are our responses to
each of your comments.  Each prospectus  page reference is to the  Institutional
Shares and Institutional Plus Shares version of the prospectus.

Comment 1:   ADDITION OF MID-CAP  RISK IN  INSTITUTIONAL  TOTAL  STOCK  MARKET
             INDEX FUND (PAGE 3)

Comment:     If the  Institutional  Total Stock  Market Index Fund (the "Stock
             Fund") invests in mid-cap stocks, move mid-cap risk disclosure to
             the Primary Risks section of the prospectus.

Response:    Item 2 of Form N-1A requires a summary of "the principal risks of
             investing  in the Fund,  including  the risks to which the Fund's
             portfolio as a whole is subject" (emphasis added).  This requires
             disclosure of the risks of a fund's overall portfolio,  not every
             risk  associated with each type of security held by the fund. The
             Commission's approach to risk disclosure is succinctly summarized
             in the 1998  release  adopting  sweeping  revisions  to Form N-1A
             (Investment  Company Act Release No. 23064 (March 13, 1998). Part
             II.A.3.b  of the  release  states  "disclosure  about  the  risks
             associated  with  each  type of  security  in which  the fund may
             invest  does  not  effectively  communicate  to  [investors]  the
             overall risks of investing in the fund. In the Commission's view,
             disclosing  the  risks  of each  possible  portfolio  investment,
             rather than the overall  risks of investing  in a fund,  does not
             help investors evaluate a particular fund or compare the risks of
             the fund with those of other funds."

<PAGE>

Mr. Christian Sandoe
April 22, 2005
Page 2 of 3

             Applying the Commission's position to the Stock Fund, we conclude
             that  disclosing  mid-cap  risk in Item 2 would  not  effectively
             communicate the overall risks of investing in the Stock Fund. The
             risk of investing in funds focused on mid- or small-cap stocks is
             that their returns can be more volatile than the returns of funds
             investing  in  large-cap  stocks.  This  risk,  however,  is  not
             significant  for the Stock Fund for two primary  reasons.  First,
             large-capitalization  stocks  constitute the preponderance of the
             Stock Fund's assets. Second, the Stock Fund's limited exposure to
             mid-and  small-cap  stocks is spread across the whole universe of
             domestic stocks.  The result of this  diversification is to limit
             sector-specific and stock-specific risk, including mid-cap risk.

             The  modest,  and broad,  exposure to mid- and  small-cap  stocks
             actually  served to reduce the  volatility  of  returns.  For the
             36-month  period ended March 31, 2005,  the Stock Fund had a beta
             of 1.00 versus the Dow Jones Wilshire 5000 Composite Index (i.e.,
             matched the volatility  exactly).  Relative to the S&P 500 Index,
             the Stock Fund's beta was 0.98%  (i.e.,  slightly  less  volatile
             than the large-cap-only S&P 500 Index).

             Highlighting  the  potential  volatility  of a  relatively  small
             portion of the Stock Fund's holdings in the Primary Risks section
             of the prospectus would be inappropriate, potentially misleading,
             and contrary to the intent of the Commission.

COMMENT 2:   INVESTMENT ADVISOR CLARIFICATION (PAGE 36)

Comment:     In the  Investment  Advisor  section  of the  prospectus,  better
             clarify  that  George  Sauter  oversees,  rather  than  does  the
             day-to-day management, of the Funds within the Trust.

Response:    We believe that the disclosure is clear as written. The paragraph
             describing  Mr.  Sauter  states  that he is  responsible  for the
             "oversight of  approximately  $530 billion  managed by Vanguard's
             Quantitative  Equity and Fixed Income Groups."  Furthermore,  the
             introduction  to the  "Plain  Talk  About  The  Funds'  Portfolio
             Managers"  clearly  states  that the  individuals  listed  in the
             highlighted  "Plain Talk" box are "primarily  responsible for the
             day-to-day  management of the Funds' portfolios." In light of our
             clear statements  about the roles of each  individual,  we do not
             believe that it is  necessary  to state that Mr.  Sauter does not
             have day-to-day management responsibilities for the Funds.

COMMENT 3:   REVISE  BOARD  REVIEW OF  ADVISORY  CONTRACTS  (PAGE  B-29 IN THE
             STATEMENT OF ADDITIONAL INFORMATION ("SAI"))

Comment:     Add disclosure to the SAI that relates the factors  considered by
             each Fund's board in reviewing  investment advisory agreements to
             the particulars of each Fund,  pursuant to Item 12(b)(10) of Form
             N-1A.

<PAGE>

Mr. Christian Sandoe
April 22, 2005
Page 3 of 3

Response:    Item 12(b)(10)  requires  funds to "discuss in reasonable  detail
             the material  factors and the  conclusions  with respect  thereto
             that formed the basis for the board of  directors  approving  the
             existing  investment  advisory  contract."  We have  revised  our
             existing  disclosure   regarding  board  approval  of  investment
             advisory agreements.

             We propose to revise the relevant SAI  disclosure as indicated in
             Appendix  A  to  this  letter.  Please  note  that  the  proposed
             disclosure  in Appendix A is subject to  editorial  revision  and
             completion.

COMMENT 4:    TANDY REQUIREMENTS

Comment:     The SEC is now requiring all  registrants  to provide at the
             end of response letters to registration  statement comments,
             the following statements:

             o    Each Fund is  responsible  for the  adequacy and accuracy of
                  the disclosure in the filing.

             o    Staff  comments or changes in response to staff  comments in
                  the  filings  reviewed  by the  staff do not  foreclose  the
                  Commission  from  taking  any  action  with  respect  to the
                  filing.

             o    Each Fund may not assert staff  comments as a defense in any
                  proceeding  initiated by the  Commission or any person under
                  the federal securities laws of the United States.

Response:    As  required  by  the  SEC,   we  will   provide  the   foregoing
             acknowledgements.

                                    * * * * *

             As required by the SEC, the Funds acknowledge that:

             o    The Funds are  responsible  for the adequacy and accuracy of
                  the disclosure in the filing.

             o    Staff  comments or changes in response to staff  comments in
                  the  filings  reviewed  by the  staff do not  foreclose  the
                  Commission  from  taking  any  action  with  respect  to the
                  filing.

             o    The Funds may not assert staff  comments as a defense in any
                  proceeding  initiated by the  Commission or any person under
                  the federal securities laws of the United States.

             Please  call  me at  (610)  669-5284  if  you  have  any  further
             questions.

                                   Sincerely,

                                Lisa L. B. Matson
                                Associate Counsel
                                The Vanguard Group, Inc.

Enclosure
<PAGE>

                                   APPENDIX A

PROHIBITIONS ON RECEIPT OF COMPENSATION OR OTHER CONSIDERATION

The Policies and Procedures  prohibit a Vanguard  fund, its investment  advisor,
and any other person to pay or receive any  compensation or other  consideration
of any type for the purpose of obtaining  disclosure of Vanguard fund  portfolio
holdings or other investment positions.  "Consideration"  includes any agreement
to  maintain  assets in the fund or in other  investment  companies  or accounts
managed by the investment  advisor or by any affiliated person of the investment
advisor.

BOARD REVIEW OF INVESTMENT ADVISORY ARRANGEMENTS

Each Fund's board of trustees  oversees the Fund's management and performance on
a regular basis. In addition, the board considers annually whether each Fund and
its shareholders continue to benefit from the internalized  management structure
whereby  the  Fund  receives  investment  management  services  from  Vanguard's
Quantitative Equity and Fixed Income Groups (the Groups).  Vanguard provides the
board with monthly,  quarterly,  and annual analyses of the Groups' performance.
In addition,  Vanguard  provides the board with quarterly  self-evaluations  and
certain other  information  the board deems important to evaluate the short- and
long-term  performance  of each  Fund's  internalized  management.  Each  Fund's
portfolio  managers meet with the board  periodically  to discuss the management
and performance of the Fund.

     When considering whether to continue the internalized  management structure
of each Fund,  the board  examines  several  factors,  but does not identify any
particular  factor as  controlling  their  decision.  The board also reviews the
investment  performance  of each Fund compared with a peer group of funds and an
appropriate index.

     After  reviewing  and  considering  various  factors as they  relate to the
Funds,  the board  determines  whether it would be in the best  interests of the
respective   fund   shareholders   to  continue  the   internalized   management
arrangement.

     In its most recent review of each Fund's advisory  arrangements,  the board
identified no single factor that controlled their decision.  The primary factors
underlying the board's  determination to renew each Fund's advisory arrangements
were as follows:

VANGUARD INSTITUTIONAL INDEX FUND

The board  considered the following  factors when  determining  whether Vanguard
should continue providing  internalized  investment  management  services to the
Fund:

-    The nature, extent, and quality of the services provided.

-    The investment performance of the Fund's assets managed by Vanguard.

-    The fair market value of the services provided.

-    A  comparative  analysis of expense  ratios of, and advisory  fees paid by,
     similar funds.

-    Vanguard's control of the operating expenses of the Fund.

     The specific Fund  performance and advisory fee  information  considered by
the board included the following:

<TABLE>
<CAPTION>
<S>                                          <C>                <C>            <C>           <C>               <C>
                                                 AVERAGE ANNUAL RETURN (BEFORE TAXES)
                                                 ------------------------------------

                                                                                                                    ADVISORY FEES
                                                                                                                  EXPRESSED AS AN
                                                                   5 YEARS       10 YEARS                        ANNUAL EFFECTIVE
                                             1 YEAR ENDED            ENDED          ENDED                      RATE OF THE FUNDS'
                                               12/31/2004       12/31/2004     12/31/2004    EXPENSE RATIO      AVERAGE NET ASSET
                                               ----------       ----------     ----------    -------------      -----------------
VANGUARD INSTITUTIONAL INDEX FUND
 INSTITUTIONAL SHARES*                             10.86%           -2.26%         12.13%            0.05%                  0.02%
Average Large-Cap Core Fund**                       7.79            -4.05           9.82             1.45                   0.61
Standard & Poor's 500 Index                        10.88            -2.30          12.07              N/A                    N/A

*    Information  about  the  Fund's  Institutional  Plus  Shares  may be  found
     elsewhere in this Statement of Additional information.
**   Derived from data provided by Lipper Inc.
</TABLE>

-    The  board   considered   the  Fund's  short-  and   long-term   investment
     performance,  which is disclosed in the table  above.  The board  concluded
     that the Fund  outperformed the average large-cap core fund over the short-
     and long-term, and performed at or near its benchmark index.

                                      B-33
<PAGE>

-    The board concluded that, in the aggregate, the nature, extent, and quality
     of services  provided by  Vanguard to the Fund are  appropriate  and should
     continue.

-    The  board  assessed  the  advisory  expenses  incurred  by  the  Fund  and
     considered  the fair market value of the services  provided in light of the
     expenses  incurred.  The board  concluded  that the expenses  incurred were
     significantly  less  than the  average  advisory  fee paid by others in the
     Fund's Lipper peer group.

-    Based  upon  its  most  recent  evaluation  of the  investment  staff,  the
     portfolio   management  process,  the  investment   performance,   and  the
     internalized management arrangements, the board of the Fund determined that
     it would be in the best  interests of the Fund's  shareholders  to continue
     its internalized management arrangement.

-    Finally,  the board considered  whether the Fund should obtain  alternative
     portfolio   management   services  and  concluded   that,   under  all  the
     circumstances  and  based  on its  informed  business  judgment,  the  most
     appropriate   course  of  action  in  the  best  interests  of  the  Fund's
     shareholders  to was continue the investment  management  arrangement  with
     Vanguard.

VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND

The board  considered the following  factors when  determining  whether Vanguard
should continue providing  internalized  investment  management  services to the
Fund:

-    The nature, extent, and quality of the services provided.

-    The investment performance of the Fund's assets managed by Vanguard.

-    The fair market value of the services provided.

-    A  comparative  analysis of expense  ratios of, and advisory  fees paid by,
     similar funds.

-    Vanguard's control of the operating expenses of the Fund.

     The specific Fund  performance and advisory fee  information  considered by
the board included the following:
<TABLE>
<CAPTION>
<S>                             <C>                     <C>                    <C>           <C>               <C>
                                             AVERAGE ANNUAL RETURN (BEFORE TAXES)
                                             ------------------------------------