VANGUARD MONEY MARKET RESERVES INC
N-30D, 1994-07-20
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<PAGE>   1

CHAIRMAN'S LETTER

FELLOW SHAREHOLDER:

     Short-term interest rates turned sharply upward during the six months
ended May 31, the first half of the 1994 fiscal year for Vanguard Money Market
Reserves. Rates rose steadily throughout the period, driving upwards the
yields of our Portfolios.

     This table presents the yields of each of our Portfolios on May
31, 1994, compared with those of six months and one year ago:

<TABLE>
<CAPTION>
- - ----------------------------------------------------------------
                       Seven Day Annualized Yield
                ------------------------------------------------
Portfolio       May 31, 1994  November 30, 1993     May 31, 1993
- - ----------------------------------------------------------------
<S>                 <C>               <C>               <C>
PRIME               3.8%              3.0%              2.9%
FEDERAL             3.7               3.0               2.9
U.S. TREASURY       3.5               2.8               2.8
- - ----------------------------------------------------------------
</TABLE>

Yields on short-term reserves are rising in part because of higher demands for
credit in the marketplace. But the primary cause of these rate increases is
that the Federal Reserve, fearful of the potential for future inflation, has
forced interest rates upward. The Fed raised the Federal funds rate by fully
1.25%--from 3.00% to 4.25%--during the period. The financial markets seem a bit
"spooked" by this increase, since higher rates drive down prices of long-term
bonds. However, proving that "it is an ill wind (indeed) that blows no good,"
the sole impact on those investing in short-term obligations has been an
increase in interest income.

     What is more, further increases in the dividends you receive on your
Vanguard Money Market Reserves holdings are in prospect. Because our Portfolios
(as do virtually all money market funds) hold securities with an average
maturity in the 45- to 60-day range, there is a "lag" from the upturn in
interest rates until they are fully manifested in our yields. By way of
comparison, while the yield on the 90-day U.S. Treasury bill has risen by
nearly 35% (from 3.2% to 4.3%) since November 30, 1993, the annualized yields
of our Portfolios have risen by about 25% over the same period. So, you can
expect increases in the dividends you receive in our three Portfolios, at least
for the next few months.

     Our yields have not only risen in an absolute sense. They also remain well
above the yields achieved by most of our competitors, as shown in this table:

<TABLE>
<CAPTION>
                       Seven Day Annualized Yield
- - -------------------------------------------------------
                              May 31, 1994
                  -------------------------------------
                                 Average       Vanguard
Portfolio         Vanguard     Competitor     Advantage
- - -------------------------------------------------------
<S>                 <C>            <C>           <C>
PRIME               3.8%           3.5%          +0.3%
FEDERAL             3.7            3.4           +0.3
U.S. TREASURY       3.5            3.2           +0.3
- - -------------------------------------------------------
</TABLE>

In each case, our gross yield (the yield the Portfolio receives on its
holdings) is quite similar to those of our competitors. Our net yield (the
payments you receive after the deduction of all operating expenses) is so much
higher for the simple reason that our operating expense ratios are so much
lower. Vanguard Money Market Reserves' expense ratio is but 0.3% of average net
assets; competitive funds maintain expense ratios averaging about 0.7%, fully
133% higher than ours. (Almost unbelievable, but true.)

     I am pleased to report that our competitive returns are achieved while
maintaining the highest standards of credit quality and a conservative
investment posture. A surprising revelation of the past quarter has been the
news that a number of money market fund sponsors have reimbursed their funds to
compensate for losses on derivative investments. We believe such "exotica" have
no place in a money market fund and, accordingly, eschew them in our
Portfolios.

     In our Semi-Annual Report one year ago, I noted that "it is hard to
imagine that the steady trend over the past four years toward ever-lower
short-term interest rates can go much further." At that time, the Treasury bill
yield was 3.2%, and that was about as low as it was to go. While I do not
presume any forecasting ability, it is clear that the





                                      1

<PAGE>   2
end of the rate decline and the subsequent resurgence have enabled Vanguard
Money Market Reserves to provide you with the highest monthly dividends since
July 1992.

     I look forward to reporting more fully on our results for the full 1994
fiscal year in our Annual Report six months hence.

Sincerely,

/s/ JOHN C. BOGLE
- - ---------------------
John C. Bogle
Chairman of the Board

June 16, 1994

Note: Mutual fund data from Lipper Analytical Services, Inc.


AVERAGE ANNUAL TOTAL RETURNS--THE CURRENT YIELDS PROVIDED IN THE CHAIRMAN'S
LETTER ARE CALCULATED IN ACCORDANCE WITH SEC GUIDELINES. THE AVERAGE ANNUAL
TOTAL RETURNS FOR THE PORTFOLIOS (PERIODS ENDED MARCH 31, 1994) ARE AS FOLLOWS:

<TABLE>
<CAPTION>                                                                                               
     PORTFOLIO (INCEPTION DATE)                                    1 YEAR         5 YEARS         10 YEARS   
     --------------------------                                    ------         -------         --------   
     <S>                                                           <C>             <C>             <C>       
     PRIME PORTFOLIO (6/4/75)                                      +3.00%          +5.77%          +6.82%    
     FEDERAL PORTFOLIO (7/13/81)                                   +2.98           +5.64           +6.62     
     U.S. TREASURY PORTFOLIO (3/13/89)*                            +2.86           +5.46           +6.37     
</TABLE>

THESE DATA REPRESENT PAST PERFORMANCE; FUTURE RETURNS WILL FLUCTUATE.

*TOTAL RETURNS PROVIDED PRIOR TO MARCH 13, 1989, ARE FOR THE INSURED PORTFOLIO,
WHICH BEGAN OPERATIONS ON MARCH 9, 1983.

PLEASE NOTE THAT AN INVESTMENT IN A MONEY MARKET FUND IS NEITHER INSURED NOR
GUARANTEED BY THE U.S. GOVERNMENT, AND THERE IS NO ASSURANCE THAT THE FUND WILL
BE ABLE TO MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.





                                       2

<PAGE>   3
REPORT FROM THE INVESTMENT ADVISER

During the six months ended May 31, the first half of the 1994 fiscal year for
Vanguard Money Market Reserves, money market interest rates rose substantially.
The Federal Reserve has increased the Federal funds rate (at which banks borrow
and lend among themselves) from 3.00% to 4.25%. In addition, the discount rate
(at which banks may borrow from the Fed) was moved from 3.00% to 3.50%. It is
through its control of these two key interest rates that the Fed affects
changes in its monetary policy.

     Currently, the Fed's monetary policy goal is to remove the stimulative
effects of the low short-term interest rates that have prevailed since 1991,
and implement a "neutral" policy that allows the economy to grow at a
non-inflationary pace. Recent statistics indicate that the economy is doing
very well on its own. The housing and auto sectors are strong, employment
growth has gained momentum, and consumer confidence and business borrowings are
on the rise. Of particular importance is the increasing utilization of spare
economic capacity. In recent years, excess capacity has prevented businesses
from raising prices. As more economic resources are put to use, firms may find
that they can pass on price increases to their customers, which fuels
inflation.

     In past economic cycles, inflation has typically become a problem after
the Fed has allowed the economy to grow unchecked for too long.  Thereafter,
the Fed has had to overcompensate by pursuing aggressively restrictive monetary
policy. If the current policy is successful, the Fed can avoid larger rate
increases in the future by acting prudently now.

     To the benefit of money market investors, rising short-term rates have
increased the nominal yields of money funds. The Fed's move to a neutral stance
also carries with it the likelihood of positive real (after inflation) returns.
Given the low expenses on Vanguard Money Market Reserves and the current level
of short-term interest rates, shareholders should be experiencing positive real
returns before income taxes.

     In order to take advantage of the higher interest rate environment, we
have shortened the average maturity of the Portfolios from 60 days to
approximately 40 days. This strategy increases the responsiveness of the
Portfolios' yields to changes in interest rates because the Portfolios'
holdings turn over more frequently. The shorter average weighted maturity also
makes the market value of the Portfolios' investments less sensitive to the
negative effects of rising interest rates. This dovetails well with our
conservative management philosophy.

     In recent months, the financial press has been filled with stories of
investment managers who sustained unexpectedly large losses in the volatile
markets that have prevailed since year end. In some cases, these losses were
due to investments in "derivative" securities and the use of leverage to
increase investment exposure above that initially contributed by investors. The
most disturbing of these cases involve money managers who used these tactics to
go outside the investment objectives that were used in marketing their funds.

     Make no mistake, money market funds operate in a highly regulated
environment intended to insure that net asset values remain stable. The U.S.
Securities and Exchange Commission prohibits money market funds from investing
in volatile derivative securities or borrowing to increase investment exposure.
At Vanguard, our investment policies are actually more stringent than SEC rules
because, in our judgment, the incremental return gained by going to the legal
limits is not worth the added risk. By virtue of our low expense ratios, we can
manage the Fund well within the spirit and the letter of the law and still
provide highly competitive returns to our shareholders.

Sincerely,

Ian A. MacKinnon, Senior Vice President
Robert F. Auwaerter, Vice President
John Hollyer, Assistant Vice President

Vanguard Fixed Income Group                  June 9, 1994





                                       3

<PAGE>   4
STATEMENT OF NET ASSETS                         FINANCIAL STATEMENTS (unaudited)
                                                                    May 31, 1994
                                                            
<TABLE>
<CAPTION>
                                                   Face        Market
                                                 Amount         Value
PRIME PORTFOLIO                                   (000)        (000)+
- - ---------------------------------------------------------------------
U.S. GOVERNMENT AND AGENCY
 OBLIGATIONS (14.8%)
- - ---------------------------------------------------------------------
<S>                                          <C>           <C>
  Federal Home Loan Bank
    4.80%, 11/15/94                          $    9,480    $    9,274
  Federal Home Loan
    Mortgage Corp.
    4.448%, 6/3/94(1)                           100,000        99,924
  Federal National Mortgage Assn.
    3.216%-8.90%,
    6/1/94-11/30/94                           1,449,350     1,433,996
  U.S. Treasury Bill
    3.33%, 7/7/94                                13,427        13,383
  U.S. Treasury Notes
    4.25%-12.625%,
    8/15/94-8/31/94                             425,000       427,557
- - ---------------------------------------------------------------------
TOTAL U.S. GOVERNMENT AND
  AGENCY OBLIGATIONS
 (Cost $1,984,134)                                          1,984,134
- - ---------------------------------------------------------------------
COMMERCIAL PAPER (62.3%)
- - ---------------------------------------------------------------------
BANK HOLDING COMPANIES (6.5%)
  Bankers Trust New York Corp.
    3.703%-3.905%,
    6/2/94-6/3/94                               203,000       202,968
  CoreStates Capital
    4.25%, 7/7/94                                25,000        24,894
  J.P. Morgan & Co., Inc.
    3.874%-4.266%,
    6/3/94-7/5/94                               243,425       242,977
  NationsBank Corp.
    4.05%-4.10%,
    7/1/94-7/5/94                               200,000       199,281
  Norwest Corp.
    4.273%-4.423%,
    6/16/94-7/14/94                             112,000       111,636
  PNC Funding Corp.
    4.347%, 6/14/94                              50,000        49,922
  Republic New York Corp.
    3.773%, 6/17/94                              50,000        49,917
                                                           ----------
    GROUP TOTAL                                               881,595
                                                           ----------
- - ---------------------------------------------------------------------
FINANCE--AUTO (2.3%)
  Ford Motor Credit Corp.
    4.006%-4.317%,
    6/15/94-7/7/94                              205,000       204,401
  Toyota Motor Credit Corp.
    4.306%-4.345%,
    6/6/94-6/14/94                              105,800       105,684
                                                           ----------
    GROUP TOTAL                                               310,085
                                                           ----------
- - ---------------------------------------------------------------------
FINANCE--SECURITIES DEALERS (3.5%)
  Bear Stearns Co.
    4.281%, 6/22/94                              10,000         9,975
  Goldman Sachs & Co.
    4.372%, 7/8/94                           $   85,000    $   84,620
  Merrill Lynch & Co.
    3.836%-4.395%,
    6/23/94-7/18/94                             246,000       245,174
  Morgan Stanley Co.
    4.128%-4.181%,
    7/1/94-7/7/94                               125,000       124,555
                                                           ----------
    GROUP TOTAL                                               464,324
                                                           ----------
- - ---------------------------------------------------------------------
FINANCE--OTHER (19.3%)
  A.I. Credit Corp.
    4.214%, 8/1/94                               20,000        19,859
  American Express Credit Corp.
    3.773%, 6/10/94                             100,000        99,906
  American General Finance Corp.
    4.366%, 6/10/94                              25,000        24,973
  Asset Securitization
    Cooperative Corp.
    3.774%-4.447%,
    6/2/94-8/2/94                               321,200       319,433
  Associates Corp.
    3.996%-4.345%,
    6/8/94-7/5/94                               225,000       224,354
  Barclays U.S. Funding Corp.
    3.964%-3.987%,
    6/6/94-6/27/94                              170,000       169,597
  CIT Group Holdings Inc.
    3.804%-4.345%,
    6/8/94-6/24/94                              230,000       229,564
  Cargill Financial Services
    3.99%, 7/6/94                                35,000        34,866
  Ciesco L.P.
    3.816%-4.367%,
    6/6/94-7/7/94                               266,500       265,960
  Commercial Credit Co.
    3.899%-4.317%,
    6/6/94-6/15/94                              130,000       129,873
  Corporate Asset Funding Corp.
    3.774%-4.448%,
    6/9/94-7/14/94                              195,960       195,554
  Eiger Capital Corp.
    4.308%, 6/20/94                              63,684        63,540
  General Electric Capital Corp.
    3.805%-4.885%,
    6/6/94-11/22/94                             376,480       374,870
    3.969%-4.406%,
    6/1/94-7/11/94(1)                           140,000       140,000
  MCA Funding Corp.
    3.957%-4.297%,
    7/13/94-7/18/94                              29,200        29,046
</TABLE>





                                       4

<PAGE>   5
<TABLE>
<CAPTION>
                                                   Face        Market
                                                 Amount         Value
                                                  (000)        (000)+
- - ---------------------------------------------------------------------
<S>                                           <C>         <C>
  Matterhorn Capital Corp.
    4.287%-4.318%,
    6/20/94-6/21/94                           $  97,892   $    97,666
  Panasonic Finance
    3.816%-4.142%,
    6/23/94-7/20/94                              38,600        38,466
  Pitney Bowes Credit Corp.
    3.907%-4.275%,
    6/16/94-7/8/94                               75,000        74,814
  Prudential Home Mortgage Co.
    4.433%, 7/25/94                              50,000        49,670
                                                           ----------
    GROUP TOTAL                                             2,582,011
                                                           ----------
- - ---------------------------------------------------------------------
INDUSTRIAL (7.1%)
  Cargill Inc.
    3.763%, 6/8/94                               15,000        14,989
  Chevron Oil Finance Co.
    3.976%, 6/28/94                              50,000        49,852
  Daimler-Benz N.A. Co.
    4.312%-4.332%,
    6/1/94-6/17/94                              160,000       159,894
  Dun & Bradstreet
    3.812%, 6/21/94                              12,000        11,975
  Emerson Electric
    4.314%, 6/7/94                               81,500        81,442
  Hewlett Packard Co.
    4.314%-4.887%,
    6/10/94-11/15/94                             32,725        32,269
  Intel
    4.028%-4.337%,
    6/13/94-7/1/94                               83,000        82,837
  Kellogg
    4.267%-4.315%,
    6/9/94-6/20/94                               46,000        45,911
  Kimberly-Clark
    4.346%, 6/10/94                              22,000        21,976
  Merck & Co.
    4.358%-4.876%,
    8/24/94-11/21/94                             59,500        58,267
  Mobil Australia Finance
    4.334%, 6/9/94                               18,000        17,983
  Motorola
    4.354%, 6/6/94                               10,000         9,994
  Nestle Capital Corp.
    3.876%-4.318%,
    6/6/94-6/16/94                              173,700       173,539
  Norfolk Southern Corp.
    3.957%-4.336%,
    6/13/94-7/14/94                              40,000        39,868
  Schering Corp.
    3.765%, 6/6/94                               13,460        13,453
  Texaco
    4.306%, 6/15/94                           $  50,000   $    49,916
  Union Pacific Corp.
    3.724%, 6/2/94                               17,700        17,698
  Vermont American
    4.365%, 6/9/94                               21,185        21,165
  Warner Lambert
    4.265%, 6/15/94                              50,000        49,917
                                                           ----------
    GROUP TOTAL                                               952,945
                                                           ----------
- - ---------------------------------------------------------------------
INSURANCE (3.2%)
  AIG Funding Inc.
    3.802%-4.811%,
    6/1/94-11/17/94                              91,590        91,065
  John Hancock Capital Corp.
    3.806%, 6/29/94                              26,825        26,746
  MetLife Funding Corp.
    3.913%-4.315%,
    6/8/94-8/2/94                                60,000        59,760
  Prudential Funding Corp.
    3.754%-3.805%,
    6/15/94-6/23/94                             100,000        99,812
  Safeco Credit Corp.
    3.805%-3.807%,
    6/13/94-6/16/94                              25,500        25,462
  UNUM Corp.
    4.391%, 6/10/94                              10,000         9,989
  USAA Capital Corp.
    3.956%-4.315%,
    6/6/94-6/27/94                              112,125       111,928
                                                           ----------
    GROUP TOTAL                                               424,762
                                                           ----------
- - ---------------------------------------------------------------------
UTILITIES (5.1%)
  American Telephone
    & Telegraph Co.
    3.765%-4.315%,
    6/9/94-7/21/94                              505,151       503,974
  Ameritech Corp.
    3.754%-4.815%,
    6/13/94-11/22/94                             37,000        36,589
  BellSouth Telecommunications Inc.
    3.913%-4.264%,
    6/14/94-7/18/94                              83,000        82,639
  Duke Power
    4.316%, 6/13/94                              13,000        12,982
  Southern California Edison
    4.078%-4.132%,
    7/1/94-7/11/94                               37,882        37,743
  Union Pacific
    4.366%, 6/9/94                                8,200         8,192
                                                           ----------
    GROUP TOTAL                                               682,119
                                                           ----------
- - ---------------------------------------------------------------------
</TABLE>



                                      5

<PAGE>   6
STATEMENT OF NET ASSETS (continued)


<TABLE>
<CAPTION>
                                                   Face        Market
                                                 Amount         Value
                                                  (000)        (000)+
- - ---------------------------------------------------------------------
<S>                                          <C>           <C>
FOREIGN BANKS (3.9%)
  Abbey National N.A.
    4.133%-4.142%,
    7/25/94-7/26/94                          $  170,000    $  168,945
  Bayerische Vereinsbank
    3.786%, 6/17/94                              25,000        24,958
  Commerzbank U.S. Finance Inc.
    4.265%, 6/30/94                              50,000        49,829
  Hypo U.S. Finance Inc.
    3.887%, 7/13/94                              75,000        74,663
  International Nederlanden
    U.S. Funding
    4.295%-4.449%,
    6/10/94-8/4/94                              160,000       159,669
  Rabobank U.S. Financial Corp.
    3.343%, 6/16/94                              28,042        28,004
  Toronto Dominion Holdings
    4.428%, 8/4/94                               20,000        19,844
                                                           ----------
    GROUP TOTAL                                               525,912
                                                           ----------
- - ---------------------------------------------------------------------
CANADIAN GOVERNMENT (5.0%)
  Canada Bills
    4.111%-4.865%,
    7/25/94-11/15/94                            260,000       256,306
  Canadian Wheat Board
    3.775%-4.935%,
    6/28/94-11/22/94                            150,000       148,685
  Province of Alberta
    3.763%, 6/7/94                               10,000         9,994
  Province of British Columbia
    3.795%-4.911%,
    6/7/94-11/22/94                             125,510       123,574
  Province of Ontario
    3.355%-3.402%,
    6/21/94-7/18/94                              50,000        49,896
  Ontario Hydro
    3.796%-3.81%,
    6/1/94-6/9/94                                79,000        78,946
                                                           ----------
    GROUP TOTAL                                               667,401
                                                           ----------
- - ---------------------------------------------------------------------
OTHER FOREIGN GOVERNMENT (4.7%)
  Caisse des Depots et 
    Consignations
    4.02%-4.366%, 6/2/94-7/5/94                 276,000       275,536
  New South Wales Treasury Corp.
    3.774%-4.337%,
    6/10/94-6/24/94                             204,500       204,138
  Oesterreichische Kontrollbank
    3.355%, 6/30/94                              35,000        34,907
  Kingdom of Sweden
    3.283%, 7/14/94                              40,000        39,846
  Western Australia Treasury
    Corp.
    4.159%-4.535%,
    7/12/94-7/18/94                              53,000        52,700
  Wool International
    3.801%, 6/13/94                          $   25,000    $   24,969
                                                           ----------
    GROUP TOTAL                                               632,096
                                                           ----------
- - ---------------------------------------------------------------------
FOREIGN INDUSTRIAL (1.7%)
  BASF
    3.816%-3.836%,
    6/21/94-6/28/94                              56,000        55,861
  British Gas
    4.29%-4.314%,
    6/6/94-6/10/94                               80,000        79,936
  Electricite de France
    3.261%-3.302%,
    6/1/94-7/11/94                               60,000        59,844
  Siemens Corp.
    4.01%, 7/5/94                                30,000        29,887
                                                           ----------
    GROUP TOTAL                                               225,528
                                                           ----------
- - ---------------------------------------------------------------------
TOTAL COMMERCIAL PAPER
    (Cost $8,348,778)                                       8,348,778
- - ---------------------------------------------------------------------
CERTIFICATES OF DEPOSIT (17.1%)
- - ---------------------------------------------------------------------
U.S. BANKS (.9%)
  American Express Centurion Bank
    4.32%, 6/20/94                               25,000        25,000
  Bank One (Denver)
    3.90%-4.30%, 6/3/94-6/23/94                 100,000        99,999
                                                           ----------
    GROUP TOTAL                                               124,999
                                                           ----------
- - ---------------------------------------------------------------------
YANKEE CERTIFICATES OF DEPOSIT--
  CANADIAN BRANCHES (.5%)
  ABN AMRO
    3.816%-3.817%,
    6/14/94-6/16/94                              53,000        52,919
  Societe Generale
    3.837%, 6/16/94                              20,000        19,968
                                                           ----------
    GROUP TOTAL                                                72,887
                                                           ----------
- - ---------------------------------------------------------------------
YANKEE CERTIFICATES OF DEPOSIT--
  U.S. BRANCHES (15.7%)
  ABN AMRO
    3.72%-3.88%,
    6/3/94-7/8/94                               208,000       207,992
  Bank of Nova Scotia
    4.27%, 6/24/94                              143,000       143,000
  Barclays Bank
    4.35%, 6/13/94                               22,000        22,000
  Canadian Imperial
    Bank of Commerce
    3.78%-4.13%,
    6/7/94-7/25/94                              235,000       235,000
  Commerzbank
    3.84%-4.36%,
    6/1/94-6/10/94                              185,000       185,000
</TABLE>





                                       6

<PAGE>   7
<TABLE>
<CAPTION>
                                                   Face        Market
                                                 Amount         Value
                                                  (000)        (000)+
- - ---------------------------------------------------------------------
<S>                                          <C>           <C>
  Caisse Nationale de Credit 
    Agricole
    4.85%, 11/21/94                          $  200,000    $  200,000
  Credit Suisse
    3.87%-3.88%,
    7/12/94-7/13/94                              87,000        87,001
  National Westminster Bank
    3.85%-4.28%,
    6/30/94-8/15/94                             205,000       204,966
  Rabobank Nederland
    4.25%-4.75%,
    6/15/94-11/4/94                             125,000       124,997
  Societe Generale
    3.80%-4.27%,
    6/8/94-8/2/94                               237,000       237,001
  Swiss Bank
    3.80%, 6/14/94                              200,000       200,000
  Union Bank of Switzerland
    3.95%, 7/5/94                                50,000        49,995
  Westdeutsche Landesbank
    3.23%-4.10%,
    6/10/94-7/20/94                             200,000       200,000
                                                           ----------
    GROUP TOTAL                                             2,096,952
                                                           ----------
- - ---------------------------------------------------------------------
TOTAL CERTIFICATES OF DEPOSIT
    (Cost $2,294,838)                                       2,294,838
- - ---------------------------------------------------------------------
EURODOLLAR CERTIFICATES OF DEPOSIT (2.9%)
- - ---------------------------------------------------------------------
  Bayerische Hypotheken
    und Wechselbank
    4.34%, 6/13/94                              100,000       100,000
  Bayerische Vereinsbank
    4.34%, 8/8/94                                46,000        45,997
  Caisse Nationale de Credit 
    Agricole
    4.97%, 12/9/94                               10,000         9,999
  Deutsche Bank
    4.725%, 11/7/94                              50,000        49,990
  Dresdner Bank
    3.37%-3.62%,
    6/15/94-7/1/94                               12,000        12,001
  Morgan Guaranty
    4.04%, 7/6/94                               125,000       125,007
  Republic Bank of New York
    3.89%, 7/14/94                               30,000        29,991
  Union Bank of Switzerland
    4.38%, 6/13/94                               10,000        10,000
- - ---------------------------------------------------------------------
TOTAL EURODOLLAR CERTIFICATES
 OF DEPOSIT
  (Cost $382,985)                                             382,985
- - ---------------------------------------------------------------------
BANKERS ACCEPTANCE 
- - ---------------------------------------------------------------------
  Republic Bank of New York
    3.894%, 7/15/94 (Cost $6,967)                 7,000         6,967
- - ---------------------------------------------------------------------
OTHER NOTES (3.4%)
  Amtrak Trust
    4.475%, 6/6/94(1)                         $  80,581    $   80,581
  Bank One (Texas)
    4.43%, 6/2/94-6/3/94(1)                     145,000       144,990
  Morgan Guaranty Trust
    4.37%-4.39%, 6/1/94(1)                      200,000       199,910
  SMM Trust 4.74%, 8/22/94(1)                    20,000        20,000
  Westdeutsche Landesbank
    3.70%, 1/11/95                               13,000        12,893
- - ---------------------------------------------------------------------
TOTAL OTHER NOTES
    (Cost $458,374)                                           458,374
- - ---------------------------------------------------------------------
REPURCHASE AGREEMENTS (1.6%)
- - ---------------------------------------------------------------------
  Chase Manhattan Bank
    4.25%, 6/13/94*
    (Collateralized by Federal
    Home Loan Mortgage Corp.
    7.00%, 5/1/24)                               20,000        20,000
  Kidder Peabody & Co. Inc.
    3.80%, 6/3/94*
    (Collateralized by U.S. Treasury
    Bond 7.25%, 5/15/16 and
    Federal National Mortgage Assn.
    5.30%-8.65%,
    12/10/97-12/24/01)                          169,565       169,565
    3.80%, 6/6/94*
    (Collateralized by Federal
    National Mortgage Assn.
    5.30%-6.30%,
    12/10/97-3/11/98)                            20,000        20,000
- - ---------------------------------------------------------------------
TOTAL REPURCHASE AGREEMENTS
    (Cost $209,565)                                           209,565
- - ---------------------------------------------------------------------
TOTAL INVESTMENTS (102.1%)
    (Cost $13,685,641)                                     13,685,641
- - ---------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-2.1%)
- - ---------------------------------------------------------------------
  Other Assets--Note B                                        239,148
  Liabilities                                                (525,878)
                                                           ----------
                                                             (286,730)
- - ---------------------------------------------------------------------
NET ASSETS (100%)
- - ---------------------------------------------------------------------
  Applicable to 13,398,591,965 outstanding
    $.001 par value shares
    (authorized 25,000,000,000 shares)                    $13,398,911
- - ---------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                       $1.00
=====================================================================
</TABLE>
+   See Note A to Financial Statements.
*   Put Option Obligation.
(1) Floating Rate Note.




                                       7

<PAGE>   8
STATEMENT OF NET ASSETS (continued)

<TABLE>
<CAPTION>
- - ---------------------------------------------------------------------
AT MAY 31, 1994, NET ASSETS CONSISTED OF:
- - ---------------------------------------------------------------------
                                                 Amount           Per
                                                  (000)         Share
                                                  -----         -----
<S>                                         <C>                 <C>
  Paid in Capital                           $13,398,668         $1.00
  Undistributed Net
    Investment Income                                --            --
  Accumulated Net
    Realized Gains                                  243            --
  Unrealized Appreciation
    of Investments                                   --            --
- - ---------------------------------------------------------------------
NET ASSETS                                  $13,398,911         $1.00
- - ---------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
                                                   Face        Market
                                                 Amount         Value
FEDERAL PORTFOLIO                                 (000)        (000)+
- - ---------------------------------------------------------------------
<S>                                           <C>          <C>
U.S. GOVERNMENT AND AGENCY                    
 OBLIGATIONS (94.5%)
- - ---------------------------------------------------------------------
  Federal Home Loan Bank
    3.181%-4.80%,
    6/8/94-11/15/94                            $348,755    $  346,733
  Federal Home Loan
    Mortgage Corp.
    3.625%-4.625%,
    6/3/94-6/16/94(1)                           200,000       199,885
    3.644%-4.237%,
    6/1/94-8/3/94                               573,649       571,632
  Federal National Mortgage 
    Assn.
    3.216%-4.928%,
    6/1/94-11/30/94                             671,925       667,216
  Overseas Private Investment 
    Corp.
    3.878%-5.26%,
    6/1/94-8/25/94(1)*                          135,709       135,709
  U.S. Treasury Note
    12.625%, 8/15/94                             15,000        15,282
- - ---------------------------------------------------------------------
TOTAL U.S. GOVERNMENT AND
   AGENCY OBLIGATIONS
   (Cost $1,936,457)                                        1,936,457
- - ---------------------------------------------------------------------
REPURCHASE AGREEMENTS (10.3%)
- - ---------------------------------------------------------------------
  Cantor Fitzgerald & Co.
    4.25%, 6/1/94
    (Collateralized by U.S.
    Treasury Note
    8.875%, 11/15/97)                            11,690        11,690
  Chase Manhattan Bank
    4.25%, 6/13/94*
    (Collateralized by Federal
    Home Loan Mortgage Corp.
    7.00%, 5/1/24)                               50,000        50,000
  Citicorp
    4.28%, 6/1/94
    (Collateralized by U.S.
    Treasury Notes
    4.25%-7.50%,
    7/31/94-3/31/96)                            100,000       100,000
  Lehman Brothers
    4.25%, 6/7/94*
    (Collateralized by Federal
    Home Loan Mortgage Corp.
    5.00%, 11/1/98 and
    Federal National Mortgage
    Assn. 8.00%, 12/1/06-6/1/07)                 50,000        50,000
- - ---------------------------------------------------------------------
TOTAL REPURCHASE AGREEMENTS
    (Cost $211,690)                                           211,690
- - ---------------------------------------------------------------------
TOTAL INVESTMENTS (104.8%)
    (Cost $2,148,147)                                       2,148,147
- - ---------------------------------------------------------------------
</TABLE>





                                      8

<PAGE>   9


<TABLE>
<CAPTION>
                                                               Market
                                                                Value
                                                               (000)+
- - ---------------------------------------------------------------------
<S>                                                        <C>
OTHER ASSETS AND LIABILITIES (-4.8%)
- - ---------------------------------------------------------------------
  Other Assets--Note B                                     $   12,659
  Payables for Securities Purchased                           (99,943)
  Other Liabilities                                           (11,702)
                                                           ----------
                                                              (98,986)
- - ---------------------------------------------------------------------
NET ASSETS (100%)
- - ---------------------------------------------------------------------
  Applicable to 2,049,067,117 outstanding
  $.001 par value shares
  (authorized 5,000,000,000 shares)                        $2,049,161
- - ---------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                       $1.00
=====================================================================
</TABLE>
+   See Note A to Financial Statements.
*   Put option obligation.
(1) Floating Rate Note.


<TABLE>
<CAPTION>
- - ---------------------------------------------------------------------
AT MAY 31, 1994, NET ASSETS CONSISTED OF:
- - ---------------------------------------------------------------------
                                                 Amount           Per
                                                  (000)         Share
                                                  -----         -----
<S>                                          <C>                <C>
  Paid in Capital                            $2,049,035         $1.00
  Undistributed Net
    Investment Income                                --            --
  Accumulated Net
    Realized Gains                                  126            --
  Unrealized Appreciation
    of Investments                                   --            --
- - ---------------------------------------------------------------------
NET ASSETS                                   $2,049,161         $1.00
- - ---------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
                                                   Face        Market
                                                 Amount         Value
U.S. TREASURY PORTFOLIO                           (000)        (000)+
- - ---------------------------------------------------------------------
U.S. GOVERNMENT OBLIGATIONS
 (99.9%)
- - ---------------------------------------------------------------------
<S>                                          <C>           <C>
U.S. TREASURY BILLS
  3.47%-4.607%,
  6/2/94-8/4/94                              $1,641,685    $1,634,682
U.S. TREASURY NOTES
  4.25%-12.625%,
  6/30/94-8/15/94                               343,340       345,799
- - ---------------------------------------------------------------------
TOTAL U.S. GOVERNMENT 
OBLIGATIONS (Cost $1,980,481)                               1,980,481
- - ---------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (.1%)
- - ---------------------------------------------------------------------
  Other Assets--Note B                                         84,795
  Liabilities                                                 (81,986)
                                                           ----------
                                                                2,809
- - ---------------------------------------------------------------------
NET ASSETS (100%)
- - ---------------------------------------------------------------------
  Applicable to 1,983,134,534 outstanding
    $.001 par value shares
    (authorized 5,000,000,000 shares)                      $1,983,290
- - ---------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                       $1.00
=====================================================================
</TABLE>
+   See Note A to Financial Statements.


<TABLE>
<CAPTION>
- - ---------------------------------------------------------------------
AT MAY 31, 1994, NET ASSETS CONSISTED OF:
- - ---------------------------------------------------------------------
                                                 Amount           Per
                                                  (000)         Share
                                             ----------         -----
<S>                                          <C>                <C>
  Paid in Capital                            $1,983,153         $1.00
  Undistributed Net
    Investment Income                                --            --
  Accumulated Net
    Realized Gains                                  137            --
  Unrealized Appreciation
    of Investments                                   --            --
- - ---------------------------------------------------------------------
NET ASSETS                                   $1,983,290         $1.00
- - ---------------------------------------------------------------------
</TABLE>





                                       9

<PAGE>   10
STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                                                  PRIME               FEDERAL         U.S. TREASURY
                                                              PORTFOLIO             PORTFOLIO             PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                       Six Months Ended      Six Months Ended      Six Months Ended
                                                           May 31, 1994          May 31, 1994          May 31, 1994
                                                                  (000)                 (000)                 (000)
- - -------------------------------------------------------------------------------------------------------------------
<S>                                              <C>          <C>          <C>        <C>        <C>        <C>
INVESTMENT INCOME
  INCOME
     Interest . . . . . . . . . . . . . . . . .               $222,081                $34,260               $30,746
- - -------------------------------------------------------------------------------------------------------------------
         Total Income . . . . . . . . . . . . .                222,081                 34,260                30,746
- - -------------------------------------------------------------------------------------------------------------------
  EXPENSES
     The Vanguard Group--Note B
         Investment Advisory Services . . . . .  $     660                 $    102              $     97
         Management and Administrative              16,664                    2,597                 2,442
         Marketing and Distribution . . . . . .      1,753      19,077           27     2,971         254     2,793
                                                 ---------                 --------              --------          
     Custodian's Fees . . . . . . . . . . . . .                    176                     32                    26
     Taxes (other than income taxes)--Note A                       514                     79                    74
     Auditing Fees  . . . . . . . . . . . . . .                     12                      4                     4
     Shareholders' Reports  . . . . . . . . . .                    413                     58                    44
     Annual Meeting and Proxy Costs . . . . . .                     19                      3                    10
     Directors' Fees and Expenses . . . . . . .                     36                      6                     5
- - -------------------------------------------------------------------------------------------------------------------
         Total Expenses . . . . . . . . . . . .                 20,247                  3,153                 2,956
- - -------------------------------------------------------------------------------------------------------------------
           Net Investment Income  . . . . . . .                201,834                 31,107                27,790
- - -------------------------------------------------------------------------------------------------------------------
REALIZED NET LOSS ON
  INVESTMENT SECURITIES SOLD  . . . . . . . . .                    (42)                   (83)                  (60)
- - -------------------------------------------------------------------------------------------------------------------
UNREALIZED APPRECIATION
 (DEPRECIATION) OF
 INVESTMENT SECURITIES  . . . . . . . . . . . .                     --                     --                    --
- - -------------------------------------------------------------------------------------------------------------------
          Net Increase in Net Assets
             Resulting from Operations  . . . .               $201,792                $31,024               $27,730
===================================================================================================================
</TABLE>





                                      10

<PAGE>   11


STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                   PRIME                     FEDERAL               U.S. TREASURY
                                               PORTFOLIO                   PORTFOLIO                   PORTFOLIO
- - ----------------------------------------------------------------------------------------------------------------
                                SIX MONTHS    Year Ended    SIX MONTHS    Year Ended    SIX MONTHS    Year Ended
                                     ENDED  November 30,         ENDED  November 30,         ENDED  November 30,
                              MAY 31, 1994          1993  MAY 31, 1994          1993  MAY 31, 1994          1993
                                     (000)         (000)         (000)         (000)         (000)         (000)
- - ----------------------------------------------------------------------------------------------------------------
<S>                            <C>          <C>            <C>           <C>          <C>            <C>
INCREASE (DECREASE)
  IN NET ASSETS
OPERATIONS
  Net Investment Income . . .  $   201,834  $    368,074   $    31,107   $    56,180   $    27,790   $    53,345
  Realized Net
    Gain (Loss) . . . . . . .          (42)           37           (83)          121           (60)          (50)
  Unrealized Appreciation
    (Depreciation)  . . . . .           --            --            --            --            --            --
- - ----------------------------------------------------------------------------------------------------------------
        Net Increase in
          Net Assets
          Resulting from
          Operations  . . . .      201,792       368,111        31,024        56,301        27,730        53,295
- - ----------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS (1)
  Net Investment Income . . .     (201,834)     (368,074)      (31,107)      (56,180)      (27,790)      (53,345)
- - ----------------------------------------------------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS
  (AT $1.00 PER SHARE)
  Issued  -- Regular  . . . .    5,957,373    12,433,362       657,260     1,384,996       816,128     1,392,485
          -- In Lieu of Cash
             Distributions  .      194,016       354,746        29,713        53,652        26,483        50,552
          -- Exchange . . . .    3,042,577     3,266,455       405,788       372,470       370,508       406,070
  Redeemed-- Regular  . . . .   (6,025,453)  (11,774,422)     (694,588)   (1,244,605)     (634,201)   (1,226,276)
          -- Exchange . . . .   (2,136,797)   (4,551,214)     (255,991)     (646,049)     (346,795)   (1,192,291)
- - ----------------------------------------------------------------------------------------------------------------
  Net Increase (Decrease)
    from Capital Share
    Transactions  . . . . . .    1,031,716      (271,073)      142,182       (79,536)      232,123      (569,460)
- - ----------------------------------------------------------------------------------------------------------------
  Total Increase
    (Decrease)  . . . . . . .    1,031,674      (271,036)      142,099       (79,415)      232,063      (569,510)
- - ----------------------------------------------------------------------------------------------------------------
NET ASSETS
  Beginning of Period . . . .   12,367,237    12,638,273     1,907,062     1,986,477     1,751,227     2,320,737
- - ----------------------------------------------------------------------------------------------------------------
  End of Period . . . . . . .  $13,398,911   $12,367,237    $2,049,161    $1,907,062    $1,983,290    $1,751,227
================================================================================================================
  (1) Income Dividends
        Per Share . . . . . .        $.016         $.030         $.016         $.029         $.015         $.028
- - ----------------------------------------------------------------------------------------------------------------
</TABLE>





                                      11

<PAGE>   12
FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                                                      PRIME PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                                                  Year Ended November 30,
                                                 SIX MONTHS ENDED     ---------------------------------------------
For a Share Outstanding Throughout Each Period       MAY 31, 1994      1993      1992      1991      1990      1989
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>       <C>       <C>       <C>       <C>       <C>
NET ASSET VALUE, BEGINNING OF PERIOD  . . . . .             $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
                                                            -----     -----     -----     -----     -----     -----
INVESTMENT OPERATIONS
  Net Investment Income . . . . . . . . . . . .              .016      .030      .038      .062      .080      .090
  Net Realized and Unrealized Gain
     (Loss) on Investments  . . . . . . . . . .                --        --        --        --        --        --
                                                            -----     -----     -----     -----     -----     -----
       TOTAL FROM INVESTMENT OPERATIONS . . . .              .016      .030      .038      .062      .080      .090
- - -------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . .             (.016)    (.030)    (.038)    (.062)    (.080)    (.090)
  Distributions from Realized Capital Gains . .                --        --        --        --        --        --
      TOTAL DISTRIBUTIONS . . . . . . . . . . .             (.016)    (.030)    (.038)    (.062)    (.080)    (.090)
- - -------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD  . . . . . . . .             $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
===================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . .            +1.60%    +3.02%    +3.89%    +6.39%    +8.32%    +9.40%
- - -------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- - ------------------------
Net Assets, End of Period (Millions)  . . . . .           $13,399   $12,367   $12,638   $13,496   $13,579   $11,067
Ratio of Expenses to Average Net Assets . . . .             .32%*      .32%      .30%      .30%      .30%      .28%
Ratio of Net Investment Income to              
  Average Net Assets  . . . . . . . . . . . . .            3.19%*     2.98%     3.82%     6.20%     8.06%     9.05%
- - -------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.


<TABLE>
<CAPTION>
                                                                                     FEDERAL PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                                                  Year Ended November 30,
                                                 SIX MONTHS ENDED     ---------------------------------------------
For a Share Outstanding Throughout Each Period       MAY 31, 1994      1993      1992      1991      1990      1989
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>       <C>       <C>       <C>       <C>       <C>
NET ASSET VALUE, BEGINNING OF PERIOD  . . . . .             $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
                                                            -----     -----     -----     -----     -----     -----
INVESTMENT OPERATIONS
  Net Investment Income . . . . . . . . . . . .              .016      .029      .038      .060      .078      .088
  Net Realized and Unrealized Gain
     (Loss) on Investments  . . . . . . . . . .                --        --        --        --        --        --
                                                            -----     -----     -----     -----     -----     -----
         TOTAL FROM INVESTMENT OPERATIONS . . .              .016      .029      .038      .060      .078      .088
- - -------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income . . . . .            (.016)    (.029)    (.038)    (.060)    (.078)    (.088)
  Distributions from Realized Capital Gains  . .               --        --        --        --        --        --
                                                            -----     -----     -----     -----     -----     -----
         TOTAL DISTRIBUTIONS . . . . . . . . . .            (.016)    (.029)    (.038)    (.060)    (.078)    (.088)
- - -------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD . . . . . . . . .            $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
===================================================================================================================
TOTAL RETURN . . . . . . . . . . . . . . . . . .           +1.58%    +2.98%    +3.83%    +6.18%    +8.14%    +9.15%
- - -------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- - ------------------------
Net Assets, End of Period (Millions) . . . . . .           $2,049    $1,907    $1,986    $2,000    $1,950    $1,531
Ratio of Expenses to Average Net Assets  . . . .            .32%*      .32%      .30%      .30%      .30%      .28%
Ratio of Net Investment Income to
  Average Net Assets . . . . . . . . . . . . . .           3.16%*     2.94%     3.76%     6.01%     7.90%     8.78%
- - -------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.





                                      12

<PAGE>   13
<TABLE>
<CAPTION>
                                                                                  U.S. TREASURY PORTFOLIO
- - ------------------------------------------------------------------------------------------------------------------
                                                                                  Year Ended November 30,
                                                 SIX MONTHS ENDED      -------------------------------------------
For a Share Outstanding Throughout Each Period       MAY 31, 1994      1993      1992      1991      1990     1989
- - ------------------------------------------------------------------------------------------------------------------
<S>                                                        <C>      <C>       <C>       <C>       <C>      <C>
NET ASSET VALUE, BEGINNING OF PERIOD  . . . . . . .         $1.00     $1.00     $1.00     $1.00     $1.00    $1.00
                                                            -----     -----     -----     -----     -----    -----
INVESTMENT OPERATIONS
  Net Investment Income . . . . . . . . . . . . . .          .015      .028      .036      .058      .077     .085
  Net Realized and Unrealized Gain
     (Loss) on Investments  . . . . . . . . . . . .            --        --        --        --        --       --
                                                            -----     -----     -----     -----     -----     ----
        TOTAL FROM INVESTMENT OPERATIONS  . . . . .          .015      .028      .036      .058      .077     .085
- - ------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . .         (.015)    (.028)    (.036)    (.058)    (.077)   (.085)
  Distributions from Realized Capital Gains . . . .            --        --        --        --        --       --
                                                            -----     -----     -----     -----     -----     ----
        TOTAL DISTRIBUTIONS . . . . . . . . . . . .         (.015)    (.028)    (.036)    (.058)    (.077)   (.085)
- - ------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD  . . . . . . . . . .         $1.00     $1.00     $1.00     $1.00     $1.00    $1.00
==================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . . . .        +1.51%    +2.86%    +3.68%    +5.94%    +8.02%   +8.89%
- - ------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- - ------------------------
Net Assets, End of Period (Millions)  . . . . . . .        $1,983    $1,751    $2,321    $2,092    $1,594     $412
Ratio of Expenses to Average Net Assets . . . . . .         .32%*      .32%      .30%      .30%      .30%    .31%+
Ratio of Net Investment Income to
  Average Net Assets  . . . . . . . . . . . . . . .        3.01%*     2.83%     3.60%     5.76%     7.74%    8.44%
- - ------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.
+Insurance premiums represent .03%.





                                      13

<PAGE>   14
NOTES TO FINANCIAL STATEMENTS

Vanguard Money Market Reserves is registered under the Investment Company Act
of 1940 as a diversified open-end investment company and consists of the Prime,
Federal, and U.S. Treasury Portfolios. The Prime Portfolio invests in
short-term debt instruments of companies primarily operating in specific
industries; the issuers' abilities to meet their obligations may be affected by
economic developments in such industries. The Federal Portfolio invests in
short-term debt instruments issued by the U.S. Government or its agencies and
instrumentalities.  The U.S. Treasury Portfolio invests in short-term debt
instruments backed by the full faith and credit of the U.S. Government.

*  A.   The following significant accounting policies are in conformity with
generally accepted accounting principles for investment companies. Such
policies are consistently followed by the Fund in the preparation of financial
statements.

1.   SECURITY VALUATION: Securities are stated at amortized cost which
     approximates market value.

2.   FEDERAL INCOME TAXES: Each Portfolio of the Fund intends to continue to
     qualify as a regulated investment company and distribute all of its
     taxable income. Accordingly, no provision for Federal income taxes is
     required in the financial statements.

3.   OTHER: Security transactions are accounted for on the date the securities
     are purchased or sold. Costs used in determining realized gains and losses
     on the sale of investment securities are those of specific securities
     sold. Discounts and premiums are accreted and amortized, respectively, to
     interest income over the lives of the respective securities. Distributions
     from net investment income are declared on a daily basis payable on the
     first business day of the following month.

4.   REPURCHASE AGREEMENTS: Securities pledged as collateral for repurchase
     agreements are held by the Fund's custodian bank until maturity of each
     repurchase agreement. Provisions of each agreement ensure that the market
     value of the collateral is sufficient in the event of default; however, in
     the event of default or bankruptcy by the other party to the agreement,
     realization and/or retention of the collateral may be subject to legal
     proceedings.

*  B.   The Vanguard Group, Inc. furnishes at cost investment advisory,
corporate management, administrative, marketing, and distribution services. The
costs of such services are allocated to the Fund under methods approved by the
Board of Directors. At May 31, 1994, the Fund had contributed capital of
$2,782,000 to Vanguard (included in Other Assets), representing 13.9% of
Vanguard's capitalization. The directors and officers of the Fund are also
directors and officers of Vanguard.




                                       
                                      14

<PAGE>   15
DIRECTORS AND OFFICERS


JOHN C. BOGLE, Chairman and Chief Executive Officer
Chairman and Director of The Vanguard Group, Inc.,
and of each of the investment companies in
The Vanguard Group.

JOHN J. BRENNAN, President
President and Director of The Vanguard Group, Inc.,
and of each of the investment companies in
The Vanguard Group.

ROBERT E. CAWTHORN, Chairman and Chief Executive
Officer of Rhone-Poulenc Rorer Inc.; Director of Sun
Company, Inc. and Immune Response Corporation;
Trustee of the Universal Health Realty Income Trust.

BARBARA BARNES HAUPTFUHRER, Director of The Great
Atlantic and Pacific Tea Company, Alco Standard
Corp., Raytheon Company, Knight-Ridder, Inc.,
and Massachusetts Mutual Life Insurance Co.

BRUCE K. MACLAURY, President of The Brookings
Institution; Director of Dayton Hudson Corporation,
American Express Bank Ltd., The St. Paul Companies,
Inc., and Scott Paper Company.

BURTON G. MALKIEL, Chemical Bank Chairman's
Professor of Economics, Princeton University;
Director of Prudential Insurance Co. of America,
Amdahl Corporation, Baker Fentress & Co.,
and The Southern New England Telephone Company.

ALFRED M. RANKIN, JR., President and Chief Executive
Officer of NACCO Industries, Inc.; Director of NACCO
Industries, The BFGoodrich Company, and
The Standard Products Company.

JOHN C. SAWHILL, President and Chief Executive
Officer of The Nature Conservancy; formerly, Director
and Senior Partner of McKinsey & Co. and President of
New York University; Director of Pacific Gas
and Electric Company and NACCO Industries.

JAMES O. WELCH, JR., Retired Chairman of Nabisco
Brands, Inc.; retired Vice Chairman and Director of
RJR Nabisco; Director of TECO Energy, Inc.

J. LAWRENCE WILSON, Chairman and Chief Executive
Officer of Rohm & Haas Company; Director of
Cummins Engine Company; Trustee of Vanderbilt
University and the Culver Educational Foundation.


OTHER FUND OFFICERS

RICHARD F. HYLAND, Treasurer; Treasurer of
The Vanguard Group, Inc., and of each of the
investment companies in The Vanguard Group.

RAYMOND J. KLAPINSKY, Secretary; Senior Vice
President and Secretary of The Vanguard Group, Inc.;
Secretary of each of the investment companies in
The Vanguard Group.

KAREN E. WEST, Controller; Vice President of
The Vanguard Group, Inc.; Controller of each of
the investment companies in The Vanguard Group.


OTHER VANGUARD GROUP OFFICERS

JEREMY G. DUFFIELD
Senior Vice President
Planning & Development

JAMES H. GATELY
Senior Vice President
Institutional

IAN A. MACKINNON
Senior Vice President
Fixed Income Group

VINCENT S. MCCORMACK
Senior Vice President
Operations

RALPH K. PACKARD
Senior Vice President
Chief Financial Officer





                                       15

<PAGE>   16
                          THE VANGUARD FAMILY OF FUNDS

                               MONEY MARKET FUNDS
                         Vanguard Money Market Reserves

                         TAX-EXEMPT MONEY MARKET FUNDS
              Vanguard Municipal Bond Fund-Money Market Portfolio
                 Vanguard State Tax-Free Funds (CA, NJ, OH, PA)

                            TAX-EXEMPT INCOME FUNDS
                          Vanguard Municipal Bond Fund
             Vanguard State Tax-Free Funds (CA, FL, NJ, NY, OH, PA)

                               FIXED INCOME FUNDS
                             Vanguard Admiral Funds
                            Vanguard Bond Index Fund
                     Vanguard Fixed Income Securities Fund
                         Vanguard Preferred Stock Fund

                                 BALANCED FUNDS
                         Vanguard Asset Allocation Fund
                          Vanguard Balanced Index Fund
                               Vanguard STAR Fund
                         Vanguard/Wellesley Income Fund
                            Vanguard/Wellington Fund

                                  EQUITY FUNDS
                            GROWTH AND INCOME FUNDS
                      Vanguard Convertible Securities Fund
                          Vanguard Equity Income Fund
                              Vanguard Index Trust
                        Vanguard Quantitative Portfolios
                 Vanguard/Trustees' Equity Fund-U.S. Portfolio
                             Vanguard/Windsor Fund
                              Vanguard/Windsor II

                                  GROWTH FUNDS
                          Vanguard/Morgan Growth Fund
                             Vanguard/PRIMECAP Fund
                         Vanguard U.S. Growth Portfolio

                            AGGRESSIVE GROWTH FUNDS
                             Vanguard Explorer Fund
                        Vanguard Specialized Portfolios

                              INTERNATIONAL FUNDS
                    Vanguard International Equity Index Fund
                    Vanguard International Growth Portfolio
             Vanguard/Trustees' Equity Fund-International Portfolio

                The Vanguard Group *  Vanguard Financial Center
                             Valley Forge, PA 19482
                   New Account Information: 1-(800) 662-7447
                 Shareholder Account Services: 1-(800) 662-2739

               This Report has been prepared for shareholders and
                may be distributed to others only if preceded or
             accompanied by a current prospectus. All Funds in the
                Vanguard Family are offered by prospectus only.
                                   Q302-05/94


VANGUARD
MONEY MARKET RESERVES

[PHOTO -- SEE EDGAR APPENDIX]

SEMI-ANNUAL REPORT
MAY 31, 1994




<PAGE>   17
                                EDGAR APPENDIX


        The back cover of the printed version of this report features the flags
of the United States of America and Vanguard flying from a halyard.




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