VANGUARD ADMIRAL FUNDS INC
N-30D, 1999-09-29
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<PAGE>   1
VANGUARD
ADMIRAL FUNDS

VANGUARD ADMIRAL TREASURY
  MONEY MARKET FUND

VANGUARD ADMIRAL SHORT-TERM
  TREASURY FUND

VANGUARD ADMIRAL INTERMEDIATE-TERM
  TREASURY FUND

VANGUARD ADMIRAL LONG-TERM
  TREASURY FUND

[PHOTO]

SEMIANNUAL
REPORT
JULY 31, 1999

[THE VANGUARD GROUP LOGO]


<PAGE>   2


AT VANGUARD, WE BELIEVE THAT TRADITION MATTERS

Our 9,000 crew members embrace the traditional values on which our success is
built, including integrity, hard work, thrift, teamwork, and fair dealing on
behalf of our clients. Our report cover pays homage to three anniversaries, each
of great significance to The Vanguard Group:

- -  The 200th anniversary of the Battle of the Nile, which commenced on August 1,
   1798. HMS Vanguard, the victorious British flagship at the Nile, is our
   namesake. And its motto-- "Leading the way"--serves as a guiding principle
   for our company.

- -  The 100th birthday, on July 23, 1998, of Walter L. Morgan, founder of
   Wellington Fund, the oldest member of what became The Vanguard Group. Mr.
   Morgan was friend and mentor to Vanguard founder John C. Bogle, and helped to
   shape the standards and business principles that Mr. Bogle laid down for
   Vanguard at its beginning nearly 25 years ago: a stress on balanced,
   diversified investments; insistence on fair dealing and candor with clients;
   and a focus on long-term investing. To our great regret, Mr. Morgan died on
   September 2, 1998.

- -  The 70th anniversary, on December 28, 1998, of the incorporation of Vanguard
   Wellington Fund. It is the nation's oldest balanced mutual fund, and one of
   only a handful of funds created in the 1920s that are still in operation.

Although Vanguard constantly tackles new challenges, adopts new technology, and
develops new services, we treasure the traditions and values that set us apart
in a crowded, competitive industry. And we salute our shareholders, whose
support and trust we strive to earn each and every day.

                                    [GRAPHIC]

                                    CONTENTS

                                  A MESSAGE TO
                                OUR SHAREHOLDERS
                                        1

                                 THE MARKETS IN
                                   PERSPECTIVE
                                        5

                                   REPORT FROM
                                   THE ADVISER
                                        7

                              PERFORMANCE SUMMARIES
                                        9

                                  FUND PROFILES
                                       11

                              FINANCIAL STATEMENTS
                                       16

                        All comparative mutual fund data
                         are from Lipper or Morningstar,
                             unless otherwise noted.


<PAGE>   3


FELLOW SHAREHOLDER,


[PHOTO]                 [PHOTO]
John J. Brennan         John C.  Bogle
Chairman & CEO          Senior Chairman

Bond prices slid during the first half of Vanguard Admiral Funds' fiscal year
amid growing concerns that strong economic growth would touch off higher
inflation. In this difficult environment for fixed-income investments, two of
our four funds registered negative returns for the six months ended July 31,
1999. Our returns ranged from +2.3% for our Treasury Money Market Fund to -7.9%
for our Long-Term Treasury Fund.

<TABLE>
<CAPTION>
- ------------------------------------------------------
                                       TOTAL RETURNS
                                      SIX MONTHS ENDED
                                       JULY 31, 1999
- ------------------------------------------------------
<S>                                           <C>
ADMIRAL TREASURY MONEY MARKET FUND            +2.3%
  (SEC 7-Day Annualized Yield: 4.56%)
Average Treasury Money Market Fund            +2.0
Salomon Smith Barney 3-Month
  U.S. Treasury Bill Index                    +2.3
- ------------------------------------------------------
ADMIRAL SHORT-TERM TREASURY FUND              +0.1%
Average Short-Term Treasury Fund              +0.2
Lehman Brothers 1-5 Year
  U.S. Treasury Bond Index                    +0.3
- ------------------------------------------------------
ADMIRAL INTERMEDIATE-TERM
  TREASURY FUND                               -4.1%
Average Intermediate-Term
  Treasury Fund                               -2.8
Lehman Brothers 5-10 Year
  U.S. Treasury Bond Index                    -4.3
- ------------------------------------------------------
ADMIRAL LONG-TERM TREASURY FUND               -7.9%
Average Long-Term Treasury Fund               -5.4
Lehman Brothers Long
  U.S. Treasury Bond Index                    -7.9
- ------------------------------------------------------
</TABLE>

       The table at right presents the six-month total return (capital change
plus reinvested dividends) for each fund compared with those of its average
mutual fund competitor and an unmanaged bond market index.

       Details on each fund, including per-share net asset values, income
dividends, and any capital gains distributions, are presented in the table that
follows this letter. The table also lists the annualized yields of each fund,
which on July 31 ranged from 4.56% for our Money Market Fund to 6.27% for our
Long-Term Fund.

       We believe that any semiannual review of bond fund returns should also
include a look at a full year's interest income. That's because semiannual
returns for bond funds account for only half of the year's interest income,
whereas price changes occur immediately in response to changes in interest
rates. Over long periods, however, the price effects of fluctuating interest
rates tend to be offsetting, so interest income accounts for virtually all of
the total return on a bond fund. The table on page 2 presents each fund's return
for the past twelve months, divided into its income and capital components.

       The impact of the rise in interest rates over the past twelve
months--particularly on the Long-Term Treasury Fund--is clearly illustrated. As
you know, bond prices and bond yields move in opposite directions. And prices of
long-term bonds suffer most when interest rates rise, just as they benefit most
from a decline in rates. Our Treasury Money Market Fund maintained its share
price of $1, as is expected but not guaranteed. For further information on
capital and income returns for each fund, see the Performance Summaries
beginning on page 9.


                                       1
<PAGE>   4


THE PERIOD IN REVIEW

The U.S. economy's impressive expansion, a strong showing in corporate profits,
and a general improvement in business conditions around the world pushed stock
prices higher during the six months ended July 31.

<TABLE>
<CAPTION>
- ------------------------------------------------------------
                              COMPONENTS OF TOTAL RETURNS
                                 TWELVE MONTHS ENDED
                                     JULY 31, 1999
                             -------------------------------
                             INCOME       CAPITAL      TOTAL
ADMIRAL TREASURY FUND        RETURN       RETURN      RETURN
- ------------------------------------------------------------
<S>                         <C>          <C>        <C>
Money Market                +4.8%         0.0%      +4.8%
Short-Term                  +5.3         -1.0       +4.3
Intermediate-Term           +5.6         -3.2       +2.4
Long-Term                   +5.5         -5.8       -0.3
- ------------------------------------------------------------
</TABLE>

       But as is often the case, good news about economic growth was bad news
for the bond market. Throughout the period, bond investors grew increasingly
concerned that factors such as low unemployment (which puts pressure on
employers to raise wages) and a rebound in commodity prices (which can increase
the prices of finished goods) would push up overall inflation. Bond investors
are particularly attuned to hints of higher prices because inflation eats away
at the purchasing power of future interest and principal payments.

       Yields of fixed-income securities moved higher across the board during
the half-year. Early in the period, the Federal Reserve Board sent several
signals that it was prepared to act swiftly to head off higher inflation. Then
on June 30, it hiked its target for short-term interest rates by 25 basis points
(0.25 percentage point), an action that typically provokes rate increases for
other maturities as well. The yield of the benchmark 30-year U.S. Treasury bond
increased more than a full percentage point on balance during the half-year,
beginning the period at 5.09% and ending it at 6.10%. The rise in the yield of
the 10-year Treasury bond was even more significant. The 10-year bond ended the
period at 5.90%--fully 125 basis points higher than its starting point. At the
short end of the spectrum, the yield of the 3-month T-bill rose on balance from
4.45% to 4.75%.

       The Lehman Aggregate Bond Index, an unmanaged measure of the entire U.S.
bond market, provided a return of -2.5% for the six months.

       The U.S. stock market, meanwhile, advanced broadly. The Wilshire 5000
Total Market Index, which tracks the entire U.S. stock market, was up +4.4%
during the half-year. Small-capitalization stocks, which returned +4.9% (as
measured by the Russell 2000 Index), slightly outperformed large-caps, which
gained +4.5% (as measured by the Standard & Poor's 500 Index). The market's gain
was not straight up, however. The Wilshire 5000 Index declined in three of the
six months, including a -3.1% slide in July.

PERFORMANCE OVERVIEW

During the half-year ended July 31, not only were bond returns disappointing
overall but the returns of three of the four Vanguard Admiral Funds fell short
of the average returns of similar mutual funds. Our TREASURY MONEY MARKET FUND
earned the highest return of the four--gaining +2.3% for the period--and was the
only one to outperform its peers, beating the +2.0% earned by the average
Treasury money market fund.

       Our SHORT-TERM TREASURY FUND landed barely in positive territory with a
six-month total return of +0.1%, a hair behind the +0.2% return of the average
short-term Treasury fund. The two other Admiral funds, which registered negative
returns for the period, trailed their peers by wider margins. The
INTERMEDIATE-TERM TREASURY FUND returned -4.1%, versus a -2.8% return for the
average competing Treasury fund. Our LONG-TERM TREASURY FUND had a six-month
total return of -7.9%, well behind the -5.4% average return of comparable funds.


                                       2
<PAGE>   5

       The explanation for the shortfall of our Intermediate-Term and Long-Term
Funds is straightforward: Their average maturities are significantly longer than
those of their average peers. For example, the average weighted maturity of our
Long-Term Fund is 20 years, while the average maturity of its comparative group
is just over 15 years. As noted earlier, longer maturities mean higher yields,
but also an increased sensitivity to changes in interest rates.

       It's important to understand that this distinction works both ways. When
interest rates are declining--as they have been for the better part of the past
decade--our funds have an advantage over their average peers. And for long-term
investors who are not concerned with interim price fluctuations, a rise in rates
can be good news. Overall, the yields of our funds as of July 31 were about a
full percentage point higher than six months ago.

       Our funds fared well versus their unmanaged indexes during the six
months, with one fund outpacing its index, two matching their benchmarks, and
one falling short. This accomplishment is notable because our funds incur
expenses that the indexes do not. However, we recognize that beating or matching
an index is small consolation in periods when our returns are negative or barely
positive.

       We believe that our policy of maintaining longer maturities will pay off
for shareholders because longer maturities normally provide higher yields, and
higher yields are the key to higher long-term returns. What is more, our funds
are aided in their quest to provide superior yields by their extremely low
expenses. Each of our funds has an annualized expense ratio (expenses as a
percentage of average net assets) of 0.15%. The average expense ratios of our
comparative groups run from 0.59% for short-term Treasury funds to 0.96% for
long-term Treasury funds. This difference gives us a remarkable cost advantage
of as much as 81 basis points (0.81 percentage point), holding quality and
maturity constant. To garner such an advantage in the bond fund field is,
finally, the key to our performance successes.

IN SUMMARY

During times when interest rates are rising, investors who take a short-term
view of the financial markets can find it difficult to justify a place for bonds
in their investment programs. But those who are investing for the long haul
understand that the benefits of bonds--diversification and compounded interest
income--can be substantial. That's why we remain steadfast in our belief that
creating and maintaining a balanced investment program of stock funds, bond
funds, and short-term reserves tailored to your goals, time horizon, and
tolerance for risk is the surest route to long-term investment success.

       We look forward to reporting to you on the full fiscal year in our 2000
annual report six months hence.



/s/ JOHN C. BOGLE                           /s/ JOHN J. BRENNAN

John C. Bogle                               John J. Brennan
Senior Chairman                             Chairman and
                                            Chief Executive Officer

August 17, 1999


                                       3
<PAGE>   6



<TABLE>
<CAPTION>
PORTFOLIO STATISTICS
- --------------------------------------------------------------------------------------------------------------------------
                               NET ASSET VALUE                     PERIODS ENDED JULY 31, 1999
                                 PER SHARE                  SIX MONTHS                   TWELVE MONTHS            SEC
                             ---------------------      ----------------------      ----------------------       30-DAY
                             JAN. 31,     JULY 31,       INCOME        CAPITAL        INCOME       CAPITAL      ANNUALIZED
ADMIRAL TREASURY FUND         1999          1999        DIVIDENDS       GAINS       DIVIDENDS       GAINS         YIELD
- --------------------------------------------------------------------------------------------------------------------------
<S>                          <C>           <C>           <C>           <C>            <C>          <C>             <C>
Money Market                 $  1.00       $  1.00       $0.022            --         $0.047           --          4.56%*
Short-Term                     10.22          9.96        0.258        $0.017          0.527       $0.055          5.61
Intermediate-Term              10.94         10.15        0.301         0.042          0.611        0.050          6.08
Long-Term                      11.72         10.38        0.316         0.103          0.640        0.150          6.27
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

*7-day yield.


                                       4
<PAGE>   7


THE MARKETS IN PERSPECTIVE
SIX MONTHS ENDED JULY 31, 1999

[PHOTO]

An improving global economy was the backdrop for generally higher stock prices
but lower bond prices during the six months ended July 31.

       A powerful expansion of the U.S. economy--which is by far the world's
largest--attracted record levels of imported products, helping foreign economies
to begin recovering from recessions. Confidence grew that global economic
activity was likely to be solid, if unspectacular, throughout 1999, with further
gains expected in 2000. This was a marked change in sentiment from autumn 1998,
when many analysts feared that economic troubles in Asia, Latin America, and
Russia would eventually weaken even the robust U.S. economy. The turnabout was
due, in part, to actions by the Federal Reserve Board and other central banks to
ease monetary policy to foster growth and restore confidence to financial
markets.

       As economic engines revved up during 1999, market interest rates rose
steadily. The Fed tapped the brakes on June 30, when it acted to boost
short-term interest rates by 0.25 percentage point. The move clearly signaled
that the Fed was more concerned about the danger of inflation than any risk of
an economic slowdown.

U.S. STOCK MARKETS

Stock prices rose during the half-year, largely because investors' expectations
for improved corporate earnings outweighed their concerns about rising interest
rates. Companies reporting higher-than-expected earnings outnumbered those with
lower-than-expected earnings, and analysts raised estimates for overall
corporate profits in 1999 and 2000. The total market, as measured by the
Wilshire 5000 Index, rose 4.4% during the six months ended July 31, while the
S&P 500 Index, a yardstick for large-capitalization stocks, gained 4.5%.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                                        TOTAL RETURNS
                                                 PERIODS ENDED JULY 31, 1999
                                             -----------------------------------
                                             6 MONTHS      1 YEAR       5 YEARS*
- --------------------------------------------------------------------------------
<S>                                          <C>         <C>         <C>
STOCKS
   S&P 500 Index                              4.5%        20.2%       26.2%
   Russell 2000 Index                         4.9          7.4        14.4
   Wilshire 5000 Index                        4.4         18.3        24.1
   MSCI EAFE Index                            7.5         10.0         8.9
- --------------------------------------------------------------------------------
BONDS
   Lehman Aggregate Bond Index               -2.5%         2.5%        7.3%
   Lehman 10 Year Municipal Bond Index       -2.6          2.8         6.6
   Salomon Smith Barney 3-Month
      U.S. Treasury Bill Index                2.3          4.7         5.2
- --------------------------------------------------------------------------------
OTHER
   Consumer Price Index                       1.5%         2.1%        2.4%
- --------------------------------------------------------------------------------
</TABLE>

*Annualized.

       Although stock returns seemed modest compared with the huge gains of
recent years, they were in line with historical norms and were impressive in
light of the rise in interest rates. Higher rates hurt stock prices because many
investors use current interest rates to discount the value of a stock's
projected earnings and dividends: the higher the rate used to discount them, the
lower the present value of future earnings and dividends.

       Within the stock market, leadership changed during the period. Value
stocks-- characterized by below-average share prices in relation to earnings,
dividends, and book


                                       5
<PAGE>   8


value--led the market's advance after having lagged growth stocks for most of
the past five years. Value stocks within the S&P 500 gained 8.3% for the six
months, while the index's growth stocks gained just 1.3%. Predominantly
value-stock industries such as energy, materials & processing, and machinery
were the big gainers during the half-year, buoyed by higher demand and prices
for oil and a number of other commodities. The worst-performing sectors were
health care (-7.6%) and consumer staples (-6.2%), both home to some high-profile
growth stocks that had infatuated investors until recently.

       Small-cap stocks, as measured by the Russell 2000 Index, gained 4.9% for
the half-year, marginally better than the return on large stocks. Even that
small victory is noteworthy, given that the Russell 2000's cumulative return
over the past three years (46.6%) lags that of the S&P 500 Index (118.1%) by
more than 70 percentage points.

U.S. BOND MARKETS

The rapid economic expansion that boosted prospects for stock prices made bond
investors wary. Although inflation was well-behaved--consumer prices rose 1.5%
for the six months and 2.1% for the twelve months ended July 31--both investors
and the Fed's policymakers were looking ahead, not behind. The concern is that
the economy is becoming overheated; inflation-adjusted gross domestic product
during the second quarter was up 5.4% from a year earlier. Too-rapid expansion
might yet trigger significant increases in wages and overall prices, many fear.
Indeed, thanks to high employment and rising wages, total U.S. wage and salary
income in June 1999 was 6.5% higher than in June 1998. Unless productivity--the
amount workers produce per hour--continues to rise at very rapid rates, such
wage growth could cause companies to boost prices for products and services.

       U.S. Treasury bond yields rose by roughly 1 percentage point--a hefty
boost for a six-month period. The yield of the 30-year Treasury bond rose 101
basis points, to 6.10% on July 31 from 5.09% on January 31. The yield of the
10-year Treasury--a benchmark especially for mortgage rates--rose 125 basis
points, to 5.90% from 4.65%. Money market rates didn't rise as far: Yields on
3-month T-bills increased on balance by 30 basis points, to 4.75% on July 31.
Bond prices, which move in the opposite direction from interest rates, fell. The
benchmark for the overall taxable bond market, the Lehman Aggregate Bond Index,
fell 2.5% on a total-return basis, as interest income of about 3.0% for the six
months was more than offset by a 5.5% average decline in bond prices.

INTERNATIONAL STOCK MARKETS

Stock prices in Japan and many emerging markets rebounded sharply from steep
losses in 1997 and 1998, as investors reckoned that these nations' economies
were finally on the mend. In Europe, stock prices were modestly higher in
local-currency terms but slightly negative for U.S. investors because of the
U.S. dollar's gains against European currencies. (Returns from abroad are
diminished when the dollar's value rises against other currencies, and augmented
when the dollar falls in value.)

       Overall, the developed markets outside the United States gained 7.5% in
U.S.-dollar terms, as measured by the Morgan Stanley Capital International
Europe, Australasia, Far East (EAFE) Index. The Pacific region was up 27.8% in
local-currency terms and 29.5% for U.S. investors, because the Japanese yen
gained against the dollar. Europe, which accounts for the lion's share of EAFE's
market capitalization, was up 3.7% in local currencies. But in U.S. dollars, the
return from European stocks was -0.8% because of weakness in European
currencies. The MSCI Select Emerging Markets Free Index shot up 30.9%, led by
gains of more than 60% in Indonesia, Singapore, and Turkey.


                                       6
<PAGE>   9


REPORT FROM THE ADVISER

[PHOTO]

Bond returns were generally negative during the six months ended July 31, the
first half of the fiscal year for Vanguard Admiral Funds. Interest rates rose by
about 1 percentage point during the half-year, and the resulting fall in bond
prices more than offset interest earned. Short-term bonds roughly broke even,
but returns for intermediate- and long-term bonds, whose prices are more
sensitive to changing interest rates, ranged from about -3% to about -8%. Our
three Admiral bond funds produced returns that reflected their average
maturities, and the Admiral Treasury Money Market Fund produced a return of
2.3%.

       The forces behind the rise in interest rates during the half-year are
essentially the reverse of those that roiled global financial markets in the
latter part of 1998. At that time, the Federal Reserve Board lowered interest
rates to jump-start the capital markets after they had "seized up" in response
to Russia's default on its debts, hedge fund liquidations, and other crises.
Fearful that poorly functioning markets would cut off the flow of capital that
sustains economic growth, the Fed engineered three interest rate reductions that
encouraged shell-shocked investors to buy. By the start of our new fiscal year
in February, it was becoming clear that the tonic of lower rates had worked and
that the yield premiums required to induce investors to assume credit,
prepayment, and liquidity risks had contracted.

       For the bond market, the old phrase "be careful what you wish for" was
about to prove its truthfulness. Propelled by strong wage and employment growth
and rapidly accumulating wealth from stock investments, consumer spending surged
and soon had the economy firing on all cylinders. The housing sector, a catalyst
for consumption, was especially strong. In February, Federal Reserve Chairman
Alan Greenspan testified that the reduced interest rates of 1998 might no longer
be appropriate in an environment of restored confidence and strong economic
expansion. With productivity growth running above 2% (a high rate by historical
standards, although productivity is notoriously hard to measure with any
precision), Chairman Greenspan had in recent years experimented with letting the
economy find the upper limits of noninflationary growth. However, he recently
indicated that he thought those limits might be at hand--that the shrinking
supply of available workers now threatened to push up wages and prices. In his
view, price stability is the key to sustained economic growth. The Fed therefore
acted to preempt inflation by raising short-term interest rates 0.25 percentage
point on June 30. The markets, implicitly forecasting future events, have
factored in one or possibly two more rate hikes in the next three months or so.

       In May, risk premiums ceased to narrow for fixed-income securities other
than Treasuries, and the spreads between yields on these securities and on
Treasuries have since dramatically widened. In relation to Treasury yields, the
yields of corporate, government agency, asset-backed, and mortgage-backed
securities are now nearly as high as or, in some cases, higher than they were
during the financial markets gridlock in autumn 1998. Last year, spreads widened
because of investors' fear of defaults on debts of emerging-


                                       7
<PAGE>   10


market countries or overextended hedge funds. Today's wide spreads, by contrast,
stem from a large bulge in supply. Many bond issuers have been trying to meet
all their funding needs by the third quarter, in case Y2K concerns make markets
less liquid later in the year. This is problematic, because investors had
already bought plenty of these bonds when they offered attractively wide yields
relative to Treasuries in the wake of the 1998 crisis.

       While the current wide spreads are very attractive by historic standards,
many investors have acquired all the non-Treasury bonds they care to hold and
are concerned with maintaining some degree of liquidity themselves. Further
aggravating this situation is the increasing reluctance of securities dealers to
commit their capital to market-making activities. With dealers unwilling to hold
large inventories of securities, newly issued bonds have to be priced
cheap--offering high yields--to attract the marginal buyer.

       In the face of recent volatility and uncertainty, we have applied some
consistent themes in managing the Vanguard Admiral Funds. Anticipating rising
rates, we have been shading the interest-rate sensitivity of the Admiral
Short-Term, Intermediate-Term, and Long-Term Treasury Funds toward the lower end
of our neutral duration policies. While the funds' maturities remain true to
their names, this slight shortening of maturities marginally cushions the
negative impact of rising rates on share prices. We also are investing a larger
portion of the three bond funds' assets in U.S. government agency securities (as
permitted by the prospectus) to capture the added income offered by the wide
spreads between yields on agency and Treasury bonds. (The Admiral Treasury Money
Market Fund remains fully invested in Treasury securities.)

       While rising rates have diminished bond returns, Treasury securities have
held their value better than most other types of bonds. The various dislocations
of the fixed-income market in the past 12 months have given many investors a
renewed appreciation for the safety and liquidity of Treasuries. We will
endeavor to enhance these qualities with our commitment to disciplined portfolio
management at the lowest possible cost.

Ian A. MacKinnon, Managing Director
Robert F. Auwaerter, Principal
John W. Hollyer, Principal
David R. Glocke, Principal
Vanguard Fixed Income Group

August 12, 1999

INVESTMENT PHILOSOPHY

The funds reflect a belief that investors who want the unparalleled credit
quality of U.S. Treasury securities should be able to select portfolios with
maturities appropriate to their needs.


                                       8
<PAGE>   11


PERFORMANCE SUMMARIES

All of the data on this page represent past performance, which cannot be used to
predict future returns that may be achieved by the funds. An investment in a
money market fund is not insured or guaranteed by the Federal Deposit Insurance
Corporation or any other government agency. Although the fund seeks to preserve
the value of your investment at $1 per share, it is possible to lose money by
investing in the fund. Note that income returns can fluctuate, as can the share
price of the Admiral Short-Term Treasury Fund. An investor's shares in this
fund, when redeemed, could be worth more or less than their original cost.


<TABLE>
<CAPTION>
ADMIRAL TREASURY MONEY MARKET FUND
TOTAL INVESTMENT RETURNS: DECEMBER 14, 1992-JULY 31, 1999
- -----------------------------------------------------------
                   ADMIRAL TREASURY                AVERAGE
                   MONEY MARKET FUND                FUND*
FISCAL       CAPITAL     INCOME       TOTAL         TOTAL
YEAR         RETURN      RETURN      RETURN        RETURN
- -----------------------------------------------------------
<S>          <C>         <C>         <C>           <C>
1993         0.0%        0.4%        0.4%          0.4%
1994         0.0         3.0         3.0           2.6
1995         0.0         4.2         4.2           3.8
1996         0.0         5.7         5.7           5.3
1997         0.0         5.2         5.2           4.7
1998         0.0         5.3         5.3           4.8
1999         0.0         5.1         5.1           4.6
2000**       0.0         2.3         2.3           2.0
- -----------------------------------------------------------
</TABLE>


 *Average Treasury Money Market Fund.

**Six months ended July 31, 1999.

See Financial Highlights table on page 27 for dividend information for
the past five years.

SEC 7-Day Annualized Yield (7/31/1999): 4.56%

<TABLE>
<CAPTION>
ADMIRAL SHORT-TERM TREASURY FUND
TOTAL INVESTMENT RETURNS: DECEMBER 14, 1992-JULY 31, 1999
- -----------------------------------------------------------
             ADMIRAL SHORT-TERM TREASURY FUND      LEHMAN*
FISCAL       CAPITAL     INCOME       TOTAL         TOTAL
YEAR         RETURN      RETURN      RETURN        RETURN
- -----------------------------------------------------------
<S>           <C>        <C>        <C>            <C>
1993           1.7%        0.7%       2.4%           2.3%
1994           1.0         4.5        5.5            6.1
1995          -4.6         5.2        0.6           -0.1
1996           4.7         6.7       11.4           12.0
1997          -1.9         6.0        4.1            4.1
1998           1.1         6.1        7.2            7.9
1999           1.1         5.6        6.7            7.0
2000**        -2.4         2.5        0.1            0.3
- -----------------------------------------------------------
</TABLE>

 *Lehman 1-5 Year Treasury Index.

**Six months ended July 31, 1999.

See Financial Highlights table on page 28 for dividend and capital gains
information for the past five years.


<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED JUNE 30, 1999*
- --------------------------------------------------------------------------------------------------------------------------
                                                                                                   SINCE INCEPTION
                                                 INCEPTION                                --------------------------------
                                                   DATE        1 YEAR       5 YEARS       CAPITAL      INCOME       TOTAL
- --------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>            <C>          <C>           <C>          <C>          <C>
Admiral Treasury Money Market Fund              12/14/1992     4.82%        5.20%         0.00%        4.71%        4.71%
Admiral Short-Term Treasury Fund                12/14/1992     4.66         6.32          0.13         5.61         5.74
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

*SEC rules require that we provide this average annual total return information
through the latest calendar quarter.


                                       9
<PAGE>   12


PERFORMANCE SUMMARIES

All of the data on this page represent past performance, which cannot be used
to predict future returns that may be achieved by the funds. Note, too, that
both share price and return can fluctuate widely. An investor's shares, when
redeemed, could be worth more or less than their original cost.

<TABLE>
<CAPTION>
ADMIRAL INTERMEDIATE-TERM TREASURY FUND
TOTAL INVESTMENT RETURNS: DECEMBER 14, 1992-JULY 31, 1999
- -----------------------------------------------------------
             ADMIRAL INTERMEDIATE-TERM
                       TREASURY FUND               LEHMAN*
FISCAL       CAPITAL     INCOME       TOTAL         TOTAL
YEAR         RETURN      RETURN      RETURN        RETURN
- -----------------------------------------------------------
<S>          <C>         <C>          <C>          <C>
1993           2.9%       0.9%         3.8%         3.8%
1994           4.1        5.8          9.9         10.6
1995          -9.4        5.7         -3.7         -4.5
1996          11.7        7.5         19.2         19.6
1997          -5.0        6.3          1.3          1.3
1998           4.2        6.8         11.0         11.7
1999           3.3        6.1          9.4         10.0
2000**        -6.9        2.8         -4.1         -4.3
- -----------------------------------------------------------
</TABLE>

 *Lehman 5-10 Year Treasury Index.

**Six months ended July 31, 1999.

See Financial Highlights table on page 28 for dividend and capital gains
information for the past five years.


<TABLE>
<CAPTION>
ADMIRAL LONG-TERM TREASURY FUND
TOTAL INVESTMENT RETURNS: DECEMBER 14, 1992-JULY 31, 1999
- ----------------------------------------------------------
             ADMIRAL LONG-TERM TREASURY FUND       LEHMAN*
FISCAL       CAPITAL     INCOME       TOTAL         TOTAL
YEAR         RETURN      RETURN      RETURN        RETURN
- ----------------------------------------------------------
<S>          <C>         <C>         <C>           <C>
1993           3.0%        1.0%        4.0%         3.8%
1994           8.6         7.3        15.9         16.7
1995         -12.9         6.3        -6.6         -7.5
1996          18.6         8.1        26.7         27.4
1997          -8.1         6.4        -1.7         -1.6
1998           9.8         7.3        17.1         18.3
1999           5.9         6.2        12.1         12.3
2000**       -10.6         2.7        -7.9         -7.9
- ----------------------------------------------------------
</TABLE>

 *Lehman Long Treasury Index.

**Six months ended July 31, 1999.

See Financial Highlights table on page 29 for dividend and capital gains
information for the past five years.


<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED JUNE 30, 1999*
- --------------------------------------------------------------------------------------------------------------------------
                                                                                                SINCE INCEPTION
                                                INCEPTION                                 --------------------------------
                                                   DATE        1 YEAR       5 YEARS       CAPITAL      INCOME       TOTAL
- --------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>            <C>          <C>           <C>          <C>          <C>
Admiral Intermediate-Term Treasury Fund         12/14/1992       3.05%       7.62%         0.63%        6.30%       6.93%
Admiral Long-Term Treasury Fund                 12/14/1992      -0.26        9.44          1.67         6.80        8.47
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

*SEC rules require that we provide this average annual total return information
through the latest calendar quarter.


                                       10
<PAGE>   13


FUND PROFILE
ADMIRAL TREASURY MONEY MARKET FUND

This Profile provides a snapshot of the fund's characteristics as of July 31,
1999. Key elements of this Profile are defined on page 12.


<TABLE>
<CAPTION>
FINANCIAL ATTRIBUTES
- ----------------------------------------------------------
<S>                                               <C>
Yield                                                 4.6%
Average Maturity                                   51 days
Average Quality                                   Treasury
Expense Ratio                                       0.15%*
</TABLE>

*Annualized.


<TABLE>
<CAPTION>
DISTRIBUTION BY CREDIT QUALITY (% OF PORTFOLIO)
- ------------------------------------------------------
<S>                                             <C>
Treasury                                        100.0%
</TABLE>


                                       11
<PAGE>   14


AVERAGE COUPON. The average interest rate paid on the securities held by a
fund. It is expressed as a percentage of face value.

AVERAGE DURATION. An estimate of how much a bond fund's share price will
fluctuate in response to a change in interest rates. To see how the price could
shift, multiply the fund's duration by the change in rates. If interest rates
rise by one percentage point, the share price of a fund with an average duration
of five years would decline by about 5%. If rates decrease by a percentage
point, the fund's share price would rise by 5%.

AVERAGE MATURITY. The average length of time until bonds held by a fund reach
maturity (or are called) and are repaid. In general, the longer the average
maturity, the more a fund's share price will fluctuate in response to changes in
market interest rates.

AVERAGE QUALITY. An indicator of credit risk, this figure is the average of the
ratings assigned to a fund's securities holdings by credit-rating agencies. The
agencies make their judgment after appraising an issuer's ability to meet its
obligations. U.S. Treasury securities are considered to have the highest credit
quality, with U.S. agency bonds almost equally high.

BETA. A measure of the magnitude of a fund's past share-price fluctuations in
relation to the ups and downs of the overall market (or appropriate market
index). The market (or index) is assigned a beta of 1.00, so a fund with a beta
of 1.20 would have seen its share price rise or fall by 12% when the overall
market rose or fell by 10%.

CASH RESERVES. The percentage of a fund's net assets invested in "cash
equivalents"--highly liquid, short-term, interest-bearing instruments. This
figure does not include cash invested in futures contracts to simulate bond
investment.

DISTRIBUTION BY CREDIT QUALITY. This breakdown of a fund's securities by credit
rating can help in gauging the risk that returns could be affected by defaults
or other credit problems.

DISTRIBUTION BY MATURITY. An indicator of interest-rate risk. In general, the
higher the concentration of longer-maturity issues, the more a fund's share
price will fluctuate in response to changes in interest rates.

EXPENSE RATIO. The percentage of a fund's average net assets used to pay its
annual administrative and advisory expenses. These expenses directly reduce
returns to investors.

INVESTMENT FOCUS. This grid indicates the focus of a fund in terms of two
attributes: average maturity (short, medium, or long) and average credit quality
(Treasury/agency, investment-grade corporate, or below investment-grade).

R-SQUARED. A measure of how much of a fund's past returns can be explained by
the returns from the overall market (or its benchmark index). If a fund's total
return were precisely synchronized with the overall market's return, its
R-squared would be 1.00. If a fund's returns bore no relationship to the
market's returns, its R-squared would be 0.

YIELD. A snapshot of a fund's interest income. The yield, expressed as a
percentage of the fund's net asset value, is based on income earned over the
past 30 days (7 days for money market funds) and is annualized, or projected
forward for the coming year.

YIELD TO MATURITY. The rate of return an investor would receive if the
securities held by a fund were held to their maturity dates.


                                       12
<PAGE>   15


FUND PROFILE
ADMIRAL SHORT-TERM TREASURY FUND

This Profile provides a snapshot of the fund's characteristics as of July 31,
1999, compared where appropriate to an unmanaged index. Key elements of this
Profile are defined on page 12.

<TABLE>
<CAPTION>
FINANCIAL ATTRIBUTES
- ----------------------------------------------------------
                                   ADMIRAL          LEHMAN
                                SHORT-TERM          INDEX*
- ----------------------------------------------------------
<S>                             <C>              <C>
Number of Issues                        43           5,381
Yield                                 5.6%            6.7%
Yield to Maturity                     5.9%            6.8%
Average Coupon                        5.8%            6.8%
Average Maturity                 3.2 years       9.0 years
Average Quality                   Treasury             Aaa
Average Duration                 2.2 years       5.0 years
Expense Ratio                      0.15%**              --
Cash Reserves                         1.9%              --
</TABLE>

 *Lehman Aggregate Bond Index.

**Annualized.


<TABLE>
<CAPTION>
VOLATILITY MEASURES
- ----------------------------------------------------------
                                   ADMIRAL          LEHMAN
                                SHORT-TERM          INDEX*
- ----------------------------------------------------------
<S>                             <C>                 <C>
R-Squared                             0.51            1.00
Beta                                  0.41            1.00
</TABLE>

*Lehman Aggregate Bond Index.


<TABLE>
<CAPTION>
DISTRIBUTION BY MATURITY (% OF PORTFOLIO)
- -------------------------------------------------------
<S>                                              <C>
Under 1 Year                                       0.8%
1-3 Years                                         69.3
3-5 Years                                         22.4
Over 5 Years                                       7.5
- -------------------------------------------------------
Total                                            100.0%
</TABLE>


<TABLE>
<CAPTION>
INVESTMENT FOCUS
- -------------------------------------------------------
<S>                                <C>
AVERAGE MATURITY                   SHORT
CREDIT QUALITY                     TREASURY/AGENCY
</TABLE>


<TABLE>
<CAPTION>
DISTRIBUTION BY CREDIT QUALITY (% OF PORTFOLIO)
- -------------------------------------------------------
<S>                                              <C>
Treasury                                          85.4%
Agency                                            14.6
- -------------------------------------------------------
Total                                            100.0%
</TABLE>


                                       13
<PAGE>   16


FUND PROFILE
ADMIRAL INTERMEDIATE-TERM TREASURY FUND

This Profile provides a snapshot of the fund's characteristics as of July 31,
1999, compared where appropriate to an unmanaged index. Key elements of this
Profile are defined on page 12.


<TABLE>
<CAPTION>
FINANCIAL ATTRIBUTES
- ----------------------------------------------------------
                                   ADMIRAL          LEHMAN
                         INTERMEDIATE-TERM          INDEX*
- ----------------------------------------------------------
<S>                             <C>              <C>
Number of Issues                        37           5,381
Yield                                 6.1%            6.7%
Yield to Maturity                     6.3%            6.8%
Average Coupon                        7.2%            6.8%
Average Maturity                 7.5 years       9.0 years
Average Quality                   Treasury             Aaa
Average Duration                 5.3 years       5.0 years
Expense Ratio                      0.15%**              --
Cash Reserves                         2.6%              --
</TABLE>

 *Lehman Aggregate Bond Index.

**Annualized.


<TABLE>
<CAPTION>
VOLATILITY MEASURES
- ----------------------------------------------------------
                                   ADMIRAL          LEHMAN
                         INTERMEDIATE-TERM          INDEX*
- ----------------------------------------------------------
<S>                                   <C>             <C>
R-Squared                             0.61            1.00
Beta                                  1.20            1.00
</TABLE>

*Lehman Aggregate Bond Index.


<TABLE>
<CAPTION>
DISTRIBUTION BY MATURITY (% OF PORTFOLIO)
- -------------------------------------------------------
<S>                                              <C>
Under 1 Year                                       1.0%
1-5 Years                                          8.0
5-10 Years                                        87.6
10-20 Years                                        3.4
20-30 Years                                        0.0
Over 30 Years                                      0.0
- -------------------------------------------------------
Total                                            100.0%
</TABLE>


<TABLE>
<CAPTION>
INVESTMENT FOCUS
- -------------------------------------------------------
<S>                                <C>
AVERAGE MATURITY                   MEDIUM
CREDIT QUALITY                     TREASURY/AGENCY
</TABLE>

<TABLE>
<CAPTION>
DISTRIBUTION BY CREDIT QUALITY (% OF PORTFOLIO)
- -------------------------------------------------------
<S>                                              <C>
Treasury                                          86.3%
Agency                                            13.7
- -------------------------------------------------------
Total                                            100.0%
</TABLE>

                                       14
<PAGE>   17
FUND PROFILE

ADMIRAL LONG-TERM TREASURY FUND


This Profile provides a snapshot of the fund's characteristics as of July 31,
1999, compared where appropriate to an unmanaged index. Key elements of this
Profile are defined on page 12.

<TABLE>
<CAPTION>
FINANCIAL ATTRIBUTES
- ----------------------------------------------------------
                                   ADMIRAL          LEHMAN
                                 LONG-TERM          INDEX*
- ----------------------------------------------------------
<S>                             <C>              <C>
Number of Issues                        21           5,381
Yield                                 6.3%            6.7%
Yield to Maturity                     6.4%            6.8%
Average Coupon                        7.4%            6.8%
Average Maturity                20.0 years       9.0 years
Average Quality                   Treasury             Aaa
Average Duration                 9.9 years       5.0 years
Expense Ratio                      0.15%**              --
Cash Reserves                         3.3%              --
</TABLE>

 *Lehman Aggregate Bond Index.

**Annualized.

<TABLE>
<CAPTION>
INVESTMENT FOCUS
- ----------------------------------------------------------
<S>                                        <C>
AVERAGE MATURITY                                      LONG
CREDIT QUALITY                             TREASURY/AGENCY
</TABLE>

<TABLE>
<CAPTION>
VOLATILITY MEASURES
- ----------------------------------------------------------
                                   ADMIRAL          LEHMAN
                                 LONG-TERM          INDEX*
- ----------------------------------------------------------
<S>                              <C>               <C>
R-Squared                             0.68            1.00
Beta                                  2.01            1.00
</TABLE>

*Lehman Aggregate Bond Index.

<TABLE>
<CAPTION>
DISTRIBUTION BY CREDIT QUALITY (% OF PORTFOLIO)
- ----------------------------------------------------------
<S>                                            <C>
Treasury                                          87.9%
Agency                                            12.1
- ----------------------------------------------------------
Total                                            100.0%
</TABLE>

<TABLE>
<CAPTION>
DISTRIBUTION BY MATURITY (% OF PORTFOLIO)
- ----------------------------------------------------------
<S>                                            <C>
Under 1 Year                                       1.1%
1-5 Years                                          0.0
5-10 Years                                        13.1
10-20 Years                                       34.6
20-30 Years                                       51.2
Over 30 Years                                      0.0
- ----------------------------------------------------------
Total                                            100.0%
</TABLE>


                                       15
<PAGE>   18


FINANCIAL STATEMENTS

JULY 31, 1999 (UNAUDITED)


STATEMENT OF NET ASSETS

This Statement provides a detailed list of each fund's holdings including each
security's market value on the last day of the reporting period. Other assets
are added to, and liabilities are subtracted from, the value of Total
Investments to calculate the fund's Net Assets. Finally, Net Assets are divided
by the outstanding shares of the fund to arrive at its share price, or Net Asset
Value (NAV) Per Share.

      At the end of the Statement of Net Assets of each fund, you will find a
table displaying the composition of the fund's net assets on both a dollar and
per-share basis. Undistributed Net Investment Income is usually zero because the
fund distributes its net income to shareholders as a dividend each day. Any
realized gains must be distributed annually, so the bulk of net assets consists
of Paid in Capital (money invested by shareholders). The balance shown for
Accumulated Net Realized Gains usually approximates the amount available to
distribute to shareholders as capital gains as of the statement date, but may
differ because certain investments or transactions may be treated differently
for financial statement and tax purposes. Any Accumulated Net Realized Losses,
and any cumulative excess of distributions over net realized gains, will appear
as negative balances. Unrealized Appreciation (Depreciation) is the difference
between the value of the fund's investments and their cost, and reflects the
gains (losses) that would be realized if the fund were to sell all of its
investments at their statement-date values.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                         FACE      MARKET
                                                                                MATURITY               AMOUNT      VALUE*
ADMIRAL TREASURY MONEY MARKET FUND                                  YIELD**         DATE                (000)       (000)
- -------------------------------------------------------------------------------------------------------------------------
U.S. GOVERNMENT SECURITIES (98.0%)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>             <C>                 <C>           <C>
U.S. Treasury Bill                                            4.669%-4.777%   10/14/1999          $  100,000    $  99,042
U.S. Treasury Bill                                            4.504%-4.564%    8/12/1999              36,625       36,565
U.S. Treasury Bill                                                   4.582%     9/9/1999             113,650      113,092
U.S. Treasury Bill                                            4.510%-4.595%     9/2/1999             554,720      552,489
U.S. Treasury Bill                                            4.489%-4.548%    8/19/1999              37,079       36,996
U.S. Treasury Bill                                            4.701%-4.725%     1/6/2000             165,000      161,667
U.S. Treasury Bill                                                   4.716%    1/13/2000              55,000       53,837
U.S. Treasury Bond                                                   5.625%   11/30/1999             226,305      226,788
U.S. Treasury Note                                                   5.625%   10/31/1999             165,000      165,261
U.S. Treasury Note                                                    5.75%    9/30/1999             122,223      122,403
U.S. Treasury Note                                                   5.875%    8/31/1999             372,489      372,823
U.S. Treasury Note                                                   5.875%   11/15/1999             364,608      365,438
U.S. Treasury Note                                                    6.00%    8/15/1999           1,245,798    1,246,416
U.S. Treasury Note                                                   6.375%    1/15/2000              50,000       50,322
U.S. Treasury Note                                                   6.875%    8/31/1999             587,258      588,236
U.S. Treasury Note                                                   6.875%    3/31/2000              55,000       55,724
U.S. Treasury Note                                                   7.125%    9/30/1999             253,331      254,281
U.S. Treasury Note                                                    7.50%   10/31/1999             754,705      759,305
U.S. Treasury Note                                                    7.75%   11/30/1999             140,000      141,285
U.S. Treasury Note                                                   7.875%   11/15/1999              80,000       80,637
- -------------------------------------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT SECURITIES
  (COST $5,482,607)                                                                                              5,482,607
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       16
<PAGE>   19


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                                   MARKET
                                                                                                                   VALUE*
                                                                                                                    (000)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                           <C>
OTHER ASSETS AND LIABILITIES--NET (2.0%)                                                                       $  112,417
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS (100%)
- -------------------------------------------------------------------------------------------------------------------------
Applicable to 5,594,573,727 outstanding $.001 par value shares of beneficial interest
   (unlimited authorization)                                                                                   $5,595,024
=========================================================================================================================

NET ASSET VALUE PER SHARE                                                                                           $1.00
=========================================================================================================================

 *See Note A in Notes to Financial Statements.

**Represents annualized yield at date of purchase for discount securities, and
coupon for coupon-bearing securities.

- -------------------------------------------------------------------------------------------------------------------------
STATEMENT OF ASSETS AND LIABILITIES
- -------------------------------------------------------------------------------------------------------------------------
ASSETS
Investments in Securities at Value                                                                             $5,482,607
Receivables for Investment Securities Sold                                                                        911,195
Other Assets--Note B                                                                                              154,332
                                                                                                              -----------
   Total Assets                                                                                                 6,548,134
                                                                                                              -----------
LIABILITIES
Payables for Investment Securities Purchased                                                                     (920,612)
Other Liabilities                                                                                                 (32,498)
                                                                                                              -----------
   Total Liabilities                                                                                             (953,110)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                                     $5,595,024
=========================================================================================================================
</TABLE>

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
 AT JULY 31, 1999, NET ASSETS CONSISTED OF:
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                      AMOUNT          PER
                                                                                                       (000)        SHARE
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                              <C>               <C>
Paid in Capital                                                                                   $5,594,574        $1.00
Undistributed Net Investment Income                                                                       --           --
Accumulated Net Realized Gains                                                                           450           --
Unrealized Appreciation                                                                                   --           --
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                        $5,595,024        $1.00
=========================================================================================================================
</TABLE>


                                       17
<PAGE>   20



<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                        FACE       MARKET
                                                                                MATURITY              AMOUNT       VALUE*
ADMIRAL SHORT-TERM TREASURY FUND                                     COUPON         DATE               (000)        (000)
- -------------------------------------------------------------------------------------------------------------------------
U.S. GOVERNMENT AND AGENCY OBLIGATIONS (98.1%)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                 <C>      <C>                   <C>          <C>
U.S. GOVERNMENT SECURITIES (83.7%)
U.S. Treasury Inflation-Indexed Note                                 3.375%    1/15/2007           $  11,539    $  11,052
U.S. Treasury Inflation-Indexed Note                                 3.875%    1/15/2009              34,456       34,004
U.S. Treasury Inflation-Indexed Note                                 3.875%    4/15/2029              15,165       14,819
U.S. Treasury Note                                                    4.00%   10/31/2000              95,000       93,333
U.S. Treasury Note                                                    5.00%    2/28/2001             122,000      120,983
U.S. Treasury Note                                                   5.125%    8/31/2000              46,000       45,862
U.S. Treasury Note                                                    5.75%    8/15/2003               6,000        5,971
U.S. Treasury Note                                                   5.875%   11/30/2001              42,000       42,159
U.S. Treasury Note                                                   6.125%   12/31/2001              36,600       36,931
U.S. Treasury Note                                                    6.25%   10/31/2001              30,000       30,346
U.S. Treasury Note                                                    6.25%    1/31/2002              99,000      100,204
U.S. Treasury Note                                                    6.50%    8/31/2001              56,200       57,100
U.S. Treasury Note                                                    6.50%    5/31/2002              14,000       14,268
U.S. Treasury Note                                                   6.625%    7/31/2001             127,000      129,291
U.S. Treasury Note                                                   6.625%    4/30/2002              54,000       55,180
U.S. Treasury Note                                                    7.50%   11/15/2001              39,800       41,307
U.S. Treasury Note                                                   7.875%    8/15/2001              20,000       20,833
Banco Nacional de Comercio Exterior
   (U.S. Government Guaranteed)                                      6.475%    5/15/2000 (1)           1,178        1,183
Banco Nacional de Comercio Exterior
   (U.S. Government Guaranteed)                                      8.038%    1/15/2000 (1)             699          706
Bariven, SA Eximbank Guaranteed Export Financing
   (U.S. Government Guaranteed)                                      6.277%    4/15/2001 (1)(3)        3,200        3,199
Eximbank Guaranteed Export Financing
   (U.S. Government Guaranteed)                                       5.73%    1/15/2003 (1)(2)       29,997       29,718
Government Export Trust (U.S. Government Guaranteed)                  6.61%    9/15/1999 (1)             300          301
Government Export Trust (U.S. Government Guaranteed)                  7.75%     1/1/2000 (1)(2)          600          606
Guaranteed Export Trust (U.S. Government Guaranteed)                  7.46%   12/15/2005 (1)           6,783        6,996
Guaranteed Trade Trust (U.S. Government Guaranteed)                  6.104%    7/15/2003 (1)          26,667       26,651
Overseas Private Investment Corp. (U.S. Government Guaranteed)        5.10%    6/30/2007 (1)          17,371       16,292
Overseas Private Investment Corp. (U.S. Government Guaranteed)       5.696%     2/1/2005 (1)           6,000        5,856
Overseas Private Investment Corp. (U.S. Government Guaranteed)       5.735%    1/15/2002 (1)           5,417        5,414
Overseas Private Investment Corp. (U.S. Government Guaranteed)        5.76%    6/15/2006 (1)          20,000       19,581
Overseas Private Investment Corp. (U.S. Government Guaranteed)       5.926%    6/15/2005 (1)          11,223       10,997
Private Export Funding Corp. (U.S. Government Guaranteed)             5.73%    1/15/2004              65,950       63,984
Private Export Funding Corp. (U.S. Government Guaranteed)             6.31%    9/30/2004              10,000        9,912
Private Export Funding Corp. (U.S. Government Guaranteed)             8.40%    7/31/2001               6,000        6,265
                                                                                                              -----------
                                                                                                                1,061,304
                                                                                                              -----------
AGENCY BONDS & NOTES (9.4%)
Federal Farm Credit Bank                                              4.80%    11/6/2003               8,000        7,511
Federal Farm Credit Bank                                              5.70%    6/18/2003               8,000        7,793
Federal Farm Credit Bank                                              5.73%    7/28/2003              14,361       13,997
Federal Home Loan Bank                                               5.575%     9/2/2003              30,000       29,057
Federal Home Loan Bank                                               5.627%     9/2/2003              13,000       12,615
Federal Home Loan Bank                                                5.13%    9/15/2003               5,000        4,772
Federal Home Loan Mortgage Corp.                                      6.30%     6/1/2004              45,000       44,079
                                                                                                              -----------
                                                                                                                  119,824
                                                                                                              -----------
MORTGAGE-BACKED SECURITIES (5.0%)
Federal Home Loan Mortgage Corp.                                      6.00%     8/1/2006 (1)          40,000       38,760
Federal National Mortgage Association                                 6.00%    8/26/2006 (1)          25,000       24,234
                                                                                                              -----------
                                                                                                                   62,994
                                                                                                              -----------
- -------------------------------------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS
   (COST $1,259,982)                                                                                            1,244,122
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


                                       18
<PAGE>   21


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                        FACE       MARKET
                                                                                MATURITY              AMOUNT       VALUE*
                                                                     COUPON         DATE               (000)        (000)
- -------------------------------------------------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENTS (8.9%)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                  <C>       <C>                <C>          <C>
REPURCHASE AGREEMENTS
Collateralized by U.S. Government Obligations
   in a Pooled Cash Account                                           5.07%     8/2/1999          $   53,832   $   53,832
Collateralized by U.S. Government Obligations
   in a Pooled Cash Account--Note G                                   5.10%     8/2/1999              59,809       59,809
- -------------------------------------------------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
  (COST $113,641)                                                                                                 113,641
- -------------------------------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (107.0%)
  (COST $1,373,623)                                                                                             1,357,763
- -------------------------------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-7.0%)
- -------------------------------------------------------------------------------------------------------------------------
Other Assets--Note B                                                                                               29,222
Payables for Investment Securities Purchased                                                                      (53,925)
Security Lending Collateral Payable to Brokers--Note G                                                            (59,809)
Other Liabilities                                                                                                  (4,520)
                                                                                                              -----------
                                                                                                                  (89,032)
=========================================================================================================================
NET ASSETS (100%)
- -------------------------------------------------------------------------------------------------------------------------
Applicable to 127,397,842 outstanding $.001 par value shares of beneficial interest
   (unlimited authorization)                                                                                   $1,268,731
=========================================================================================================================

NET ASSET VALUE PER SHARE                                                                                           $9.96
=========================================================================================================================
</TABLE>

*See Note A in Notes to Financial Statements.

(1) The average maturity is shorter than the final maturity shown due to
    scheduled interim principal payments.

(2) Security exempt from registration under Rule 144A of the Securities Act of
    1933. These securities may be sold in transactions exempt from registration,
    normally to qualified institutional buyers. At July 31, 1999, the aggregate
    value of these securities was $30,324,000 representing 2.4% of net assets.

(3) Restricted security representing 0.3% of net assets at July 31, 1999.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
 AT JULY 31, 1999, NET ASSETS CONSISTED OF:
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                      AMOUNT          PER
                                                                                                       (000)        SHARE
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                              <C>              <C>
Paid in Capital                                                                                   $1,289,533       $10.12
Undistributed Net Investment Income                                                                       --           --
Accumulated Net Realized Losses                                                                       (4,942)        (.04)
Unrealized Depreciation--Note F                                                                      (15,860)        (.12)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                        $1,268,731        $9.96
=========================================================================================================================
</TABLE>



                                       19
<PAGE>   22


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                       FACE        MARKET
                                                                               MATURITY                AMOUNT      VALUE*
ADMIRAL INTERMEDIATE-TERM TREASURY FUND                              COUPON        DATE                 (000)       (000)
- -------------------------------------------------------------------------------------------------------------------------
U.S. GOVERNMENT AND AGENCY OBLIGATIONS (97.4%)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>       <C>                  <C>          <C>
U.S. GOVERNMENT SECURITIES (83.8%)
U.S. Treasury Bond                                                    7.50%   11/15/2016          $   20,965   $   23,389
U.S. Treasury Bond                                                  10.375%   11/15/2012             180,850      227,889
U.S. Treasury Bond                                                  11.625%   11/15/2004              15,300       19,126
U.S. Treasury Inflation-Indexed Note                                 3.875%    4/15/2029              21,044       20,564
U.S. Treasury Note                                                   6.125%    8/15/2007             144,400      144,731
U.S. Treasury Note                                                    6.50%   10/15/2006              12,400       12,691
U.S. Treasury Note                                                    6.50%    5/15/2005               8,600        8,804
U.S. Treasury Note                                                    6.50%    8/15/2005               8,500        8,702
U.S. Treasury Note                                                   6.875%    5/15/2006              33,100       34,566
U.S. Treasury Note                                                    7.00%    7/15/2006              38,100       40,042
U.S. Treasury Note                                                    7.50%    2/15/2005             190,100      203,422
U.S. Treasury Note                                                   7.875%   11/15/2004             139,200      150,994
Export Funding Trust (U.S. Government Guaranteed)                     8.21%   12/29/2006 (1)           7,275        7,718
Government Export Trust (U.S. Government Guaranteed)                  6.00%    3/15/2005 (1)           7,177        7,125
Guaranteed Trade Trust (U.S. Government Guaranteed)                   6.69%    1/15/2009 (1)(2)       16,850       16,948
Guaranteed Trade Trust (U.S. Government Guaranteed)                   7.39%    6/26/2006 (1)           1,668        1,718
Guaranteed Trade Trust (U.S. Government Guaranteed)                   7.46%   12/15/2005 (1)           9,043        9,328
Guaranteed Trade Trust (U.S. Government Guaranteed)                   7.80%    8/15/2006 (1)           6,250        6,512
Guaranteed Trade Trust (U.S. Government Guaranteed)                   8.17%    1/15/2007 (1)           2,500        2,647
Overseas Private Investment Corp. (U.S. Government Guaranteed)        5.94%    6/20/2006 (1)           3,684        3,640
Overseas Private Investment Corp. (U.S. Government Guaranteed)        6.08%    8/15/2004 (1)          18,591       18,492
Overseas Private Investment Corp. (U.S. Government Guaranteed)       6.726%    9/15/2010 (1)           9,000        9,014
Overseas Private Investment Corp. (U.S. Government Guaranteed)        6.75%   12/15/2008 (1)          12,667       12,789
Private Export Funding Corp. (U.S. Government Guaranteed)             5.25%    5/15/2005              28,100       26,321
Private Export Funding Corp. (U.S. Government Guaranteed)             5.73%    1/15/2004              36,665       35,572
Private Export Funding Corp. (U.S. Government Guaranteed)             5.87%    7/31/2008              49,800       46,588
Private Export Funding Corp. (U.S. Government Guaranteed)             6.49%    7/15/2007               5,500        5,426
Private Export Funding Corp. (U.S. Government Guaranteed)             7.11%    4/15/2007              13,235       13,548
                                                                                                              -----------
                                                                                                                1,118,306
                                                                                                              -----------
AGENCY BONDS & NOTES (13.6%)
Federal Home Loan Bank                                               4.925%   10/14/2008              48,580       42,484
Federal Home Loan Bank                                               5.315%   12/23/2008              24,385       21,933
Federal Home Loan Bank                                                5.80%     9/2/2008               5,600        5,258
Federal Home Loan Bank                                               5.945%    7/28/2008              31,500       29,652
Federal Home Loan Bank                                               6.525%    6/17/2009              10,500       10,272
Federal Home Loan Bank                                               6.795%    6/30/2009              18,875       18,828
Federal Home Loan Mortgage Corp.                                      5.75%    3/15/2009              11,900       11,068
Federal National Mortgage Association                                6.375%    6/15/2009               2,800        2,728
Federal National Mortgage Association                                 6.40%    5/14/2009              40,200       38,209
                                                                                                              -----------
                                                                                                                  180,432
                                                                                                              -----------
- -------------------------------------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS
   (COST $1,330,927)                                                                                           1,298,738
- -------------------------------------------------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENTS (6.0%)
- -------------------------------------------------------------------------------------------------------------------------
REPURCHASE AGREEMENTS
Collateralized by U.S. Government Obligations
   in a Pooled Cash Account                                           5.07%     8/2/1999              15,449       15,449
Collateralized by U.S. Government Obligations
   in a Pooled Cash Account--Note G                                   5.10%     8/2/1999              64,279       64,279
- -------------------------------------------------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
   (COST $79,728)                                                                                                  79,728
- -------------------------------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (103.4%)
   (COST $1,410,655)                                                                                            1,378,466
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


                                       20
<PAGE>   23


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                                   MARKET
                                                                                                                   VALUE*
                                                                                                                    (000)
- -------------------------------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-3.4%)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                            <C>
REPURCHASE AGREEMENTS
Other Assets--Note B                                                                                           $   25,501
Security Lending Collateral Payable to Brokers--Note G                                                            (64,279)
Other Liabilities                                                                                                  (5,838)
                                                                                                               ----------
                                                                                                                  (44,616)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS (100%)
- -------------------------------------------------------------------------------------------------------------------------
Applicable to 131,422,279 outstanding $.001 par value shares of beneficial interest
   (unlimited authorization)                                                                                   $1,333,850
=========================================================================================================================

NET ASSET VALUE PER SHARE                                                                                          $10.15
=========================================================================================================================
</TABLE>

*See Note A in Notes to Financial Statements.

(1) The average maturity is shorter than the final maturity shown due to
    scheduled interim principal payments.

(2) Security exempt from registration under Rule 144A of the Securities Act of
    1933. These securities may be sold in transactions exempt from registration,
    normally to qualified institutional buyers. At July 31, 1999, the value of
    these securities was $16,948,000, representing 1.3% of net assets.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
AT JULY 31, 1999, NET ASSETS CONSISTED OF:
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                      AMOUNT          PER
                                                                                                       (000)        SHARE
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                              <C>              <C>
Paid in Capital                                                                                   $1,374,796       $10.46
Undistributed Net Investment Income                                                                       --           --
Accumulated Net Realized Losses                                                                       (8,757)        (.07)
Unrealized Depreciation--Note F                                                                      (32,189)        (.24)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                        $1,333,850       $10.15
=========================================================================================================================
</TABLE>


                                       21
<PAGE>   24


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                       FACE        MARKET
                                                                                MATURITY              AMOUNT       VALUE*
ADMIRAL LONG-TERM TREASURY FUND                                      COUPON         DATE               (000)        (000)
- -------------------------------------------------------------------------------------------------------------------------
U.S. GOVERNMENT AND AGENCY OBLIGATIONS (96.7%)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                <C>      <C>                   <C>         <C>
U.S. GOVERNMENT SECURITIES (84.8%)
U.S. Treasury Bond                                                    6.00%    2/15/2026          $      100   $       96
U.S. Treasury Bond                                                   6.125%   11/15/2027               1,225        1,199
U.S. Treasury Bond                                                   6.375%    8/15/2027              17,215       17,389
U.S. Treasury Bond                                                    6.50%   11/15/2026              25,990       26,646
U.S. Treasury Bond                                                   6.625%    2/15/2027              21,125       22,016
U.S. Treasury Bond                                                    6.75%    8/15/2026              38,010       40,163
U.S. Treasury Bond                                                   6.875%    8/15/2025               2,350        2,514
U.S. Treasury Bond                                                   7.125%    2/15/2023               1,570        1,717
U.S. Treasury Bond                                                    7.50%   11/15/2016              11,405       12,724
U.S. Treasury Bond                                                   7.875%    2/15/2021              67,854       79,555
U.S. Treasury Bond                                                   8.125%    8/15/2019              34,808       41,552
U.S. Treasury Bond                                                   8.125%    8/15/2021                 650          783
U.S. Treasury Bond                                                   8.875%    8/15/2017              68,970       87,087
U.S. Treasury Bond                                                   8.875%    2/15/2019              49,278       62,776
U.S. Treasury Inflation-Indexed Note                                 3.875%    1/15/2009               4,722        4,660
U.S. Treasury Inflation-Indexed Note                                 3.875%    4/15/2029               7,315        7,148
                                                                                                              -----------
                                                                                                                  408,025
                                                                                                              -----------
AGENCY BONDS & NOTES (11.9%)
Federal Home Loan Bank                                                5.29%   12/15/2008              10,000        8,979
Federal Home Loan Bank                                                5.80%     9/2/2008              41,300       38,774
Federal Home Loan Bank                                               5.865%     9/2/2008               1,950        1,830
Federal Home Loan Bank                                               6.045%    5/13/2008               3,190        3,026
Federal Home Loan Bank                                               6.795%    6/30/2009               4,845        4,833
                                                                                                              -----------
                                                                                                                   57,442
                                                                                                              -----------
- -------------------------------------------------------------------------------------------------------------------------
TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS
   (COST $472,448)                                                                                                465,467
- -------------------------------------------------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENTS (9.7%)
- -------------------------------------------------------------------------------------------------------------------------
REPURCHASE AGREEMENTS
Collateralized by U.S. Government Obligations
   in a Pooled Cash Account                                           5.07%     8/2/1999               5,501        5,501
Collateralized by U.S. Government Obligations
   in a Pooled Cash Account--Note G                                   5.10%     8/2/1999              41,103       41,103
- -------------------------------------------------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
   (COST $46,604)                                                                                                  46,604
- -------------------------------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (106.4%)
   (COST $519,052)                                                                                                512,071
- -------------------------------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-6.4%)
- -------------------------------------------------------------------------------------------------------------------------
Other Assets--Note B                                                                                           $   13,446
Security Lending Collateral Payable to Brokers--Note G                                                            (41,103)
Other Liabilities                                                                                                  (3,182)
                                                                                                              -----------
                                                                                                                  (30,839)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS (100%)
- -------------------------------------------------------------------------------------------------------------------------
Applicable to 46,350,644 outstanding $.001 par value shares of beneficial interest
   (unlimited authorization)                                                                                     $481,232
=========================================================================================================================

NET ASSET VALUE PER SHARE                                                                                          $10.38
=========================================================================================================================
</TABLE>

*See Note A in Notes to Financial Statements.


                                       22

<PAGE>   25


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------

                                                                                                      AMOUNT          PER
                                                                                                       (000)        SHARE
- -------------------------------------------------------------------------------------------------------------------------
AT JULY 31, 1999, NET ASSETS CONSISTED OF:
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                <C>            <C>
Paid in Capital                                                                                     $488,910       $10.55
Undistributed Net Investment Income                                                                       --           --
Overdistributed Net Realized Gains--Note E                                                              (697)        (.02)
Unrealized Depreciation--Note F                                                                       (6,981)        (.15)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                          $481,232       $10.38
=========================================================================================================================
</TABLE>


                                       23
<PAGE>   26



STATEMENT OF OPERATIONS

This Statement shows interest earned by each fund during the reporting period,
and details the operating expenses charged to the fund. These expenses directly
reduce the amount of investment income available to pay to shareholders as
income dividends. This Statement also shows any Net Gain (Loss) realized on the
sale of investments, and the increase or decrease in the Unrealized Appreciation
(Depreciation) on investments during the period. If a fund invested in futures
contracts during the period, the results of these investments are shown
separately.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                         ADMIRAL            ADMIRAL              ADMIRAL         ADMIRAL
                                                        TREASURY         SHORT-TERM    INTERMEDIATE-TERM       LONG-TERM
                                                    MONEY MARKET           TREASURY             TREASURY        TREASURY
                                                            FUND               FUND                 FUND            FUND
                                                    ---------------------------------------------------------------------
                                                                        SIX MONTHS ENDED JULY 31, 1999
                                                    ---------------------------------------------------------------------
                                                           (000)              (000)               (000)            (000)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                  <C>            <C>                     <C>
INVESTMENT INCOME
INCOME
    Interest                                            $124,636            $32,817             $39,949          $14,084
    Security Lending                                          --                 93                  11               21
                                                    --------------------------------------------------------------------
        Total Income                                     124,636             32,910              39,960           14,105
                                                    --------------------------------------------------------------------
EXPENSES
    The Vanguard Group--Note B
        Investment Advisory Services                         325                 76                  83               29
        Management and Administrative                      3,042                692                 752              256
        Marketing and Distribution                           583                136                 142               47
    Custodian Fees                                            20                  8                   7                6
    Auditing Fees                                              5                  4                   4                4
    Shareholders' Reports                                     50                 13                  17                9
    Trustees' Fees and Expenses                                3                  1                   1               --
                                                    --------------------------------------------------------------------
        Total Expenses                                     4,028                930               1,006              351
        Expenses Paid Indirectly--Note C                     (13)                --                  --               --
                                                    --------------------------------------------------------------------
        Net Expenses                                       4,015                930               1,006              351
- ------------------------------------------------------------------------------------------------------------------------
NET INVESTMENT INCOME                                    120,621             31,980              38,954           13,754
- ------------------------------------------------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)
- ------------------------------------------------------------------------------------------------------------------------
    Investment Securities Sold                               460             (4,829)             (8,531)             312
    Futures Contracts                                         --                 --                (138)              --
- ------------------------------------------------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)                                     460             (4,829)             (8,669)             312
- ------------------------------------------------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION
    (DEPRECIATION)
    Investment Securities                                     --            (26,027)            (87,528)         (53,231)
    Futures Contracts                                         --                 --                 (15)              --
- ------------------------------------------------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION
    (DEPRECIATION)                                            --            (26,027)            (87,543)         (53,231)
- ------------------------------------------------------------------------------------------------------------------------
NET INCREASE (DECREASE) IN NET ASSETS
    RESULTING FROM OPERATIONS                           $121,081            $ 1,124            $(57,258)        $(39,165)
========================================================================================================================
</TABLE>


                                       24
<PAGE>   27

STATEMENT OF CHANGES IN NET ASSETS

This Statement shows how each fund's total net assets changed during the two
most recent reporting periods. The Operations section summarizes information
detailed in the Statement of Operations. Because the fund distributes its income
to shareholders each day, the amounts of Distributions-- Net Investment Income
generally equal the net income earned as shown under the Operations section. The
amounts of Distributions--Realized Capital Gain may not match the capital gains
shown in the Operations section, because distributions are determined on a tax
basis and may be made in a period different from the one in which the gains were
realized on the financial statements. The Capital Share Transactions section
shows the amount shareholders invested in the fund, either by purchasing shares
or by reinvesting distributions, and the amounts redeemed. The corresponding
numbers of Shares Issued and Redeemed are shown at the end of the Statement.

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
                                                            ADMIRAL TREASURY                     ADMIRAL SHORT-TERM
                                                            MONEY MARKET FUND                       TREASURY FUND
                                                  ---------------------------------     --------------------------------
                                                      SIX MONTHS               YEAR         SIX MONTHS              YEAR
                                                           ENDED              ENDED              ENDED             ENDED
                                                   JUL. 31, 1999      JAN. 31, 1999      JUL. 31, 1999     JAN. 31, 1999
                                                           (000)              (000)              (000)             (000)
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                <C>                <C>               <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
    Net Investment Income                            $  120,621         $  221,665          $  31,980          $  51,308
    Realized Net Gain (Loss)                                460               (284)            (4,829)             6,290
    Change in Unrealized Appreciation
      (Depreciation)                                         --                  --           (26,027)             4,134
                                                  ----------------------------------------------------------------------
        Net Increase (Decrease) in Net Assets
            Resulting from Operations                   121,081            221,381              1,124             61,732
                                                  ----------------------------------------------------------------------
DISTRIBUTIONS
    Net Investment Income                              (120,621)          (221,665)           (31,980)           (51,308)
    Realized Capital Gain                                     --                 --            (2,088)            (4,773)
                                                  ----------------------------------------------------------------------
       Total Distributions                             (120,621)          (221,665)           (34,068)           (56,081)
                                                  ----------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS(1)
    Issued                                            2,629,929          5,189,503            357,936            889,960
    Issued in Lieu of Cash Distributions                113,405            206,536             26,951             44,624
    Redeemed                                         (2,205,726)        (4,219,201)          (340,542)          (463,865)
                                                  ----------------------------------------------------------------------
    Net Increase from Capital
        Share Transactions                              537,608          1,176,838             44,345            470,719
- ------------------------------------------------------------------------------------------------------------------------
    Total Increase (Decrease)                           538,068          1,176,554             11,401            476,370
- ------------------------------------------------------------------------------------------------------------------------
NET ASSETS
    Beginning of Period                               5,056,956          3,880,402          1,257,330            780,960
                                                  ----------------------------------------------------------------------
    End of Period                                    $5,595,024         $5,056,956         $1,268,731         $1,257,330
========================================================================================================================

(1)Shares Issued (Redeemed)
    Issued                                            2,629,929          5,189,503             35,540             87,237
    Issued in Lieu of Cash Distributions                113,405            206,536              2,682              4,376
    Redeemed                                         (2,205,726)        (4,219,201)           (33,801)           (45,568)
                                                  ----------------------------------------------------------------------
        Net Increase in Shares Outstanding              537,608          1,176,838              4,421             46,045
========================================================================================================================
</TABLE>


                                       25
<PAGE>   28


STATEMENT OF CHANGES IN NET ASSETS (continued)
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
                                                      ADMIRAL INTERMEDIATE-TERM                  ADMIRAL LONG-TERM
                                                           TREASURY FUND                           TREASURY FUND
                                                  ---------------------------------     --------------------------------
                                                      SIX MONTHS               YEAR         SIX MONTHS              YEAR
                                                           ENDED              ENDED              ENDED             ENDED
                                                   JUL. 31, 1999      JAN. 31, 1999      JUL. 31, 1999     JAN. 31, 1999
                                                           (000)              (000)              (000)             (000)
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                <C>               <C>                <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
    Net Investment Income                            $    38,954        $    64,893         $  13,754         $   23,642
    Realized Net Gain (Loss)                              (8,669)            20,371               312              6,371
    Change in Unrealized Appreciation
        (Depreciation)                                   (87,543)            17,871           (53,231)            17,628
                                                  ----------------------------------------------------------------------
        Net Increase (Decrease) in Net Assets
            Resulting from Operations                    (57,258)           103,135           (39,165)            47,641
                                                  ----------------------------------------------------------------------
DISTRIBUTIONS
    Net Investment Income                                (38,954)           (64,893)          (13,754)           (23,642)
    Realized Capital Gain                                 (5,431)              (969)           (4,442)            (2,175)
                                                  ----------------------------------------------------------------------
        Total Distributions                              (44,385)           (65,862)          (18,196)           (25,817)
                                                  ----------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS(1)
    Issued                                               335,730            752,778           184,084            388,444
    Issued in Lieu of Cash Distributions                  34,763             51,403            14,177             19,302
    Redeemed                                            (294,932)          (386,931)         (158,399)          (257,933)
                                                  ----------------------------------------------------------------------
        Net Increase from Capital
            Share Transactions                            75,561            417,250            39,862            149,813
- ------------------------------------------------------------------------------------------------------------------------
    Total Increase (Decrease)                            (26,082)           454,523           (17,499)           171,637
- ------------------------------------------------------------------------------------------------------------------------
NET ASSETS
    Beginning of Period                                1,359,932            905,409           498,731            327,094
                                                  ----------------------------------------------------------------------
    End of Period                                     $1,333,850         $1,359,932          $481,232           $498,731
========================================================================================================================

(1)Shares Issued (Redeemed)
    Issued                                                31,998             69,909             17,012            33,961
    Issued in Lieu of Cash Distributions                   3,343              4,776              1,315             1,685
    Redeemed                                             (28,201)           (35,851)           (14,519)          (22,520)
                                                  ----------------------------------------------------------------------
        Net Increase in Shares Outstanding                 7,140             38,834              3,808            13,126
========================================================================================================================
</TABLE>


                                       26
<PAGE>   29


FINANCIAL HIGHLIGHTS

This table summarizes each fund's investment results and distributions to
shareholders on a per-share basis. It also presents the fund's Total Return and
shows net investment income and expenses as percentages of average net assets.
These data will help you assess: the variability of the fund's net income and
total returns from year to year; the relative contributions of net income and
capital gains to the fund's total return; how much it costs to operate the fund;
and the extent to which the fund tends to distribute capital gains.

      The table also shows the Portfolio Turnover Rate, a measure of trading
activity. A turnover rate of 100% means that the average security is held in the
fund for one year. Money market funds are not required to report a Portfolio
Turnover Rate.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
                                                                          ADMIRAL TREASURY MONEY MARKET FUND
                                                                                YEAR ENDED JANUARY 31,
FOR A SHARE OUTSTANDING                SIX MONTHS ENDED     -------------------------------------------------------------
THROUGHOUT EACH PERIOD                    JULY 31, 1999         1999          1998         1997        1996          1995
- -------------------------------------------------------------------------------------------------------------------------
<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                          .022         .050          .052         .051        .055          .041
    Net Realized and Unrealized Gain
        (Loss) on Investments                        --           --           --            --          --            --
                                                  -----------------------------------------------------------------------
        Total from Investment
          Operations                               .022         .050          .052         .051        .055          .041
                                                  -----------------------------------------------------------------------
DISTRIBUTIONS
    Dividends from Net
        Investment Income                         (.022)       (.050)        (.052)       (.051)      (.055)        (.041)
    Distributions from Realized
        Capital Gains                                --           --            --          --           --           --
                                                  -----------------------------------------------------------------------
        Total Distributions                       (.022)       (.050)        (.052)       (.051)      (.055)        (.041)
- -------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                    $1.00        $1.00         $1.00        $1.00       $1.00         $1.00
=========================================================================================================================

TOTAL RETURN                                      2.25%        5.12%         5.31%        5.24%       5.66%         4.19%
=========================================================================================================================

RATIOS/SUPPLEMENTAL DATA
    Net Assets, End of Period
        (Millions)                               $5,595       $5,057        $3,880       $3,247      $1,778        $1,371
    Ratio of Total Expenses to
        Average Net Assets                       0.15%*        0.15%         0.15%        0.15%       0.15%         0.15%
    Ratio of Net Investment Income to
        Average Net Assets                       4.50%*        4.97%         5.20%        5.12%       5.50%         4.21%
=========================================================================================================================
</TABLE>

*Annualized.


                                       27
<PAGE>   30



FINANCIAL HIGHLIGHTS (continued)
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
                                                                            ADMIRAL SHORT-TERM TREASURY FUND
                                                                                 YEAR ENDED JANUARY 31,
FOR A SHARE OUTSTANDING                 SIX MONTHS ENDED    ------------------------------------------------------------
THROUGHOUT EACH PERIOD                    JULY 31, 1999         1999         1998         1997         1996         1995
- ------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>                 <C>            <C>          <C>          <C>          <C>
NET ASSET VALUE, BEGINNING OF PERIOD             $10.22       $10.15        $10.04      $10.23       $ 9.77       $10.26
- ------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
    Net Investment Income                          .258         .548         .592         .587         .626         .518
    Net Realized and Unrealized Gain
        (Loss) on Investments                     (.243)        .114         .110        (.190)        .460        (.468)
                                                ------------------------------------------------------------------------
        Total from Investment
          Operations                               .015         .662         .702         .397        1.086         .050
                                                ------------------------------------------------------------------------
DISTRIBUTIONS
    Dividends from Net
        Investment Income                         (.258)       (.548)       (.592)       (.587)       (.626)       (.518)
    Distributions from Realized
        Capital Gains                             (.017)       (.044)          --           --           --        (.022)
                                                ------------------------------------------------------------------------
        Total Distributions                       (.275)       (.592)       (.592)       (.587)       (.626)       (.540)
- ------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                     9.96        $10.22       $10.15       $10.04       $10.23      $ 9.77
========================================================================================================================

TOTAL RETURN                                      0.15%        6.70%        7.21%        4.05%       11.41%        0.57%
========================================================================================================================

RATIOS/SUPPLEMENTAL DATA
    Net Assets, End of Period
        (Millions)                               $1,269       $1,257         $781         $553         $426         $333
    Ratio of Total Expenses to
        Average Net Assets                       0.15%*        0.15%        0.15%        0.15%        0.15%        0.15%
    Ratio of Net Investment Income to
        Average Net Assets                       5.16%*        5.35%        5.89%        5.85%        6.22%        5.30%
    Portfolio Turnover Rate                       109%*         130%          81%          80%          95%         129%
========================================================================================================================
</TABLE>

*Annualized.


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
                                                                         ADMIRAL INTERMEDIATE-TERM TREASURY FUND
                                                                                YEAR ENDED JANUARY  31,
FOR A SHARE OUTSTANDING                 SIX MONTHS ENDED    ------------------------------------------------------------
THROUGHOUT EACH PERIOD                    JULY 31, 1999         1999         1998         1997         1996         1995
- ------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                  <C>           <C>          <C>          <C>          <C>
NET ASSET VALUE, BEGINNING OF PERIOD             $10.94       $10.60       $10.17       $10.70       $ 9.58       $10.58
- ------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
    Net Investment Income                          .301         .624         .645         .648         .665         .598
    Net Realized and Unrealized Gain
        (Loss) on Investments                     (.748)        .348         .430        (.530)       1.120        (.995)
                                                ------------------------------------------------------------------------
        Total from Investment
          Operations                              (.447)        .972        1.075         .118        1.785        (.397)
                                                ------------------------------------------------------------------------
DISTRIBUTIONS
    Dividends from Net
        Investment Income                         (.301)       (.624)       (.645)       (.648)       (.665)       (.598)
    Distributions from Realized
        Capital Gains                             (.042)       (.008)          --           --           --        (.005)
                                                ------------------------------------------------------------------------
        Total Distributions                       (.343)       (.632)       (.645)       (.648)       (.665)       (.603)
- ------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                   $10.15       $10.94       $10.60       $10.17       $10.70       $ 9.58
========================================================================================================================

TOTAL RETURN                                     -4.12%        9.45%       10.98%        1.30%       19.16%       -3.67%
========================================================================================================================

RATIOS/SUPPLEMENTAL DATA
    Net Assets, End of Period
        (Millions)                               $1,334       $1,360         $905         $659         $585         $357
    Ratio of Total Expenses to
        Average Net Assets                       0.15%*        0.15%        0.15%        0.15%        0.15%        0.15%
    Ratio of Net Investment Income to
        Average Net Assets                       5.81%*        5.80%        6.28%        6.37%        6.49%        6.15%
    Portfolio Turnover Rate                        46%*          63%          34%          52%          64%         134%
========================================================================================================================
</TABLE>

*Annualized.

                                       28
<PAGE>   31


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
                                                                             ADMIRAL LONG-TERM TREASURY FUND
                                                                                YEAR ENDED JANUARY  31,
FOR A SHARE OUTSTANDING                SIX MONTHS ENDED     ------------------------------------------------------------
THROUGHOUT EACH PERIOD                    JULY 31, 1999         1999         1998         1997         1996         1995
- ------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                  <C>           <C>          <C>         <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD             $11.72       $11.12       $10.13       $11.06      $  9.40       $10.90
- ------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
    Net Investment Income                          .316         .654         .669         .681         .691         .670
    Net Realized and Unrealized Gain
        (Loss) on Investments                    (1.237)        .653         .990        (.900)       1.749       (1.405)
                                                ------------------------------------------------------------------------
        Total from Investment
          Operations                              (.921)       1.307        1.659        (.219)       2.440        (.735)
                                                ------------------------------------------------------------------------
DISTRIBUTIONS
    Dividends from Net
        Investment Income                         (.316)       (.654)       (.669)       (.681)       (.691)       (.670)
    Distributions from Realized
        Capital Gains                             (.103)       (.053)          --        (.030)       (.089)       (.095)
                                                ------------------------------------------------------------------------
        Total Distributions                       (.419)       (.707)       (.669)       (.711)       (.780)       (.765)
- ------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                   $10.38       $11.72       $11.12       $10.13       $11.06      $  9.40
========================================================================================================================

TOTAL RETURN                                     -7.94%       12.11%       17.05%       -1.75%       26.74%       -6.60%
========================================================================================================================

RATIOS/SUPPLEMENTAL DATA
    Net Assets, End of Period
        (Millions)                                 $481         $499         $327         $192         $186         $136
    Ratio of Total Expenses to
        Average Net Assets                       0.15%*        0.15%        0.15%        0.15%        0.15%        0.15%
    Ratio of Net Investment Income to
        Average Net Assets                       5.88%*        5.72%        6.41%        6.72%        6.66%        7.06%
    Portfolio Turnover Rate                        24%*          32%          13%          42%         125%          44%
========================================================================================================================
</TABLE>

*Annualized.


                                       29
<PAGE>   32



NOTES TO FINANCIAL STATEMENTS

Vanguard Admiral Funds comprise the Admiral Treasury Money Market Fund, Admiral
Short-Term Treasury Fund, Admiral Intermediate-Term Treasury Fund, and Admiral
Long-Term Treasury Fund, each of which is registered under the Investment
Company Act of 1940 as a diversified open-end investment company, or mutual
fund.

A. The following significant accounting policies conform to generally accepted
accounting principles for mutual funds. The funds consistently follow such
policies in preparing their financial statements.

      1. SECURITY VALUATION: Admiral Treasury Money Market Fund: Investment
securities are valued at amortized cost, which approximates market value. Other
funds: Bonds, and temporary cash investments acquired over 60 days to maturity,
are valued using the latest bid prices or using valuations based on a matrix
system (which considers such factors as security prices, yields, maturities, and
ratings), both as furnished by independent pricing services. Other temporary
cash investments are valued at amortized cost, which approximates market value.
Securities for which market quotations are not readily available are valued by
methods deemed by the Board of Trustees to represent fair value.

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

      3. REPURCHASE AGREEMENTS: The Admiral Short-Term Treasury,
Intermediate-Term Treasury, and Long-Term Treasury Funds, along with other
members of The Vanguard Group, transfer uninvested cash balances into a Pooled
Cash Account, which is invested in repurchase agreements secured by U.S.
government securities. Securities pledged as collateral for repurchase
agreements are held by a custodian bank until the agreements mature. Each
agreement requires that the market value of the collateral be sufficient to
cover payments of interest and principal; however, in the event of default or
bankruptcy by the other party to the agreement, retention of the collateral may
be subject to legal proceedings.

      4. FUTURES CONTRACTS: Each Admiral fund, except the Treasury Money Market
Fund, may use Municipal Bond Index, U.S. Treasury Bond, and U.S. Treasury Note
futures contracts, with the objectives of enhancing returns, managing
interest-rate risk, maintaining liquidity, diversifying credit risk, and
minimizing transaction costs. The funds may purchase or sell futures contracts
instead of bonds to take advantage of pricing differentials between the futures
contracts and the underlying bonds. The funds may also seek to take advantage of
price differences among bond market sectors by simultaneously buying futures (or
bonds) of one market sector and selling futures (or bonds) of another sector.
Futures contracts may also be used to simulate a fully invested position in the
underlying bonds while maintaining a cash balance for liquidity. The primary
risks associated with the use of futures contracts are imperfect correlation
between changes in market values of bonds held by the funds and the prices of
futures contracts, and the possibility of an illiquid market.

      Futures contracts are valued based upon their quoted daily settlement
prices. The aggregate principal amounts of the contracts are not recorded in the
financial statements. Fluctuations in the value of the contracts are recorded in
the Statement of Net Assets as an asset (liability) and in the Statement of
Operations as unrealized appreciation (depreciation) until the contracts are
closed, when they are recorded as realized futures gains (losses).

      5. DISTRIBUTIONS: Distributions from net investment income are declared
daily and paid on the first business day of the following month. Annual
distributions from realized capital gains, if any, are recorded on the
ex-dividend date.

      6. OTHER: Security transactions are accounted for on the date securities
are bought or sold. Costs used to determine realized gains (losses) on the sale
of investment securities are those of the specific securities sold. Premiums and
discounts on debt securities purchased are amortized and accreted, respectively,
to interest income over the lives of the respective securities.


                                       30
<PAGE>   33


B. The Vanguard Group furnishes at cost investment advisory, corporate
management, administrative, marketing, and distribution services. The costs of
such services are allocated to the funds under methods approved by the Board of
Trustees. Each fund has committed to provide up to 0.40% of its net assets in
capital contributions to Vanguard. At July 31, 1999, the funds had contributed
capital to Vanguard (included in Other Assets) of:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
                                   CAPITAL CONTRIBUTED        PERCENTAGE           PERCENTAGE
                                       TO VANGUARD              OF FUND           OF VANGUARD'S
ADMIRAL FUND                              (000)               NET ASSETS         CAPITALIZATION
- -------------------------------------------------------------------------------------------------
<S>                                <C>                       <C>                 <C>
Treasury Money Market                   $1,170                  0.02%                  1.2%
Short-Term Treasury                        270                  0.02                   0.3
Intermediate-Term Treasury                 280                  0.02                   0.3
Long-Term Treasury                         100                  0.02                   0.1
- -------------------------------------------------------------------------------------------------
</TABLE>

The fund's Trustees and officers are also Directors and officers of Vanguard.

C. The funds' custodian banks have agreed to reduce their fees when the funds
maintain cash on deposit in their non-interest-bearing custody accounts. For the
six months ended July 31, 1999, custodian fee offset arrangements reduced
expenses of the Admiral Treasury Money Market Fund by $13,000.

D. During the six months ended July 31, 1999, purchases and sales of U.S.
government securities other than temporary cash investments were:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
                                                                            (000)
                                                            -------------------------------------
ADMIRAL FUND                                                   PURCHASES              SALES
- -------------------------------------------------------------------------------------------------
<S>                                                           <C>                  <C>
Short-Term Treasury                                             $717,798             $674,567
Intermediate-Term Treasury                                       424,703              298,219
Long-Term  Treasury                                               89,816               54,288
- -------------------------------------------------------------------------------------------------
</TABLE>

E. Capital gain distributions are determined on a tax basis and may differ from
realized capital gains for financial reporting purposes due to differences in
the timing of realization of gains.

   The Admiral Long-Term Treasury Fund had realized losses totaling $960,000
through January 31, 1999, which are deferred for tax purposes and reduce the
amount of unrealized appreciation on investment securities for tax purposes (see
Note F).

F. At July 31, 1999, net unrealized depreciation of investment securities for
federal income tax purposes was:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
                                                                (000)
                                    -------------------------------------------------------------
                                                                                       NET
                                      APPRECIATED             DEPRECIATED          UNREALIZED
ADMIRAL FUND                          SECURITIES              SECURITIES          DEPRECIATION
- -------------------------------------------------------------------------------------------------
<S>                                   <C>                    <C>                  <C>
Short-Term Treasury                          73                $(15,933)            $(15,860)
Intermediate-Term Treasury                1,311                 (33,500)             (32,189)
Long-Term Treasury*                       5,488                 (13,429)              (7,941)
- -------------------------------------------------------------------------------------------------
</TABLE>

*See Note E.


                                       31
<PAGE>   34
NOTES TO FINANCIAL STATEMENTS (continued)

G. The market values of securities on loan to broker/dealers at July 31, 1999,
and collateral received with respect to such loans, were:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
                                                                (000)
                                    -------------------------------------------------------------
                                                                      COLLATERAL RECEIVED
                                                             ------------------------------------
                                      MARKET VALUE                                MARKET VALUE
                                        OF LOANED                               OF U.S. TREASURY
ADMIRAL FUND                           SECURITIES               CASH               SECURITIES
- -------------------------------------------------------------------------------------------------
<S>                                   <C>                     <C>               <C>
Short-Term Treasury                       62,430               $59,809                 3,996
Intermediate-Term Treasury               115,955                64,279                54,264
Long-Term Treasury                        62,015                41,103                23,111
- -------------------------------------------------------------------------------------------------
</TABLE>

Cash collateral received is invested in repurchase agreements. Security loans
are required to be secured at all times by collateral at least equal to the
market value of securities loaned; however, in the event of default or
bankruptcy by the other party to the agreement, retention of the collateral may
be subject to legal proceedings.


                                       32
<PAGE>   35



                              TRUSTEES AND OFFICERS

JOHN C. BOGLE
Founder, Senior Chairman of the Board, and Director/Trustee of The Vanguard
Group, Inc., and each of the investment companies in The Vanguard Group.

JOHN J. BRENNAN
Chairman of the Board, Chief Executive Officer, and Director/Trustee of The
Vanguard Group, Inc., and each of the investment companies in The Vanguard
Group.

JoANN HEFFERNAN HEISEN
Vice President, Chief Information Officer, and a member of the Executive
Committee of Johnson & Johnson; Director of Johnson & JohnsonoMerck Consumer
Pharmaceuticals Co., The Medical Center at Princeton, and Women's Research and
Education Institute.

BRUCE K. MacLAURY
President Emeritus of The Brookings Institution; Director of American Express
Bank Ltd., The St. Paul Companies, Inc., and National Steel Corp.

BURTON G. MALKIEL
Chemical Bank Chairman's Professor of Economics, Princeton University; Director
of Prudential Insurance Co. of America, Banco Bilbao Gestinova, Baker Fentress &
Co., The Jeffrey Co., and Select Sector SPDR Trust.

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

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 Co., Procter & Gamble Co.,
NACCO Industries, and Newfield Exploration Co.

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

J. LAWRENCE WILSON
Chairman and Chief Executive Officer of Rohm & Haas Co.; Director of Cummins
Engine Co. and The Mead Corp.; Trustee of Vanderbilt University.

                               OTHER FUND OFFICERS

RAYMOND J. KLAPINSKY
Secretary; Managing Director and Secretary of The Vanguard Group, Inc.;
Secretary of each of the investment companies in The Vanguard Group.

THOMAS J. HIGGINS
Treasurer; Principal of The Vanguard Group, Inc.; Treasurer of each of the
investment companies in The Vanguard Group.

                             OTHER VANGUARD OFFICERS

R. GREGORY BARTON
Managing Director, Legal Department.

ROBERT A. DiSTEFANO
Managing Director, Information Technology.

JAMES H. GATELY
Managing Director, Individual Investor Group.

KATHLEEN C. GUBANICH
Managing Director, Human Resources.

IAN A. MacKINNON
Managing Director, Fixed Income Group.

F. WILLIAM McNABB, III
Managing Director, Institutional Investor Group.

MICHAEL S. MILLER
Managing Director, Planning and Development.

RALPH K. PACKARD
Managing Director and Chief Financial Officer.

GEORGE U. SAUTER
Managing Director, Core Management Group

  "Standard & Poor's(R)," "S&P(R)," "S&P 500(R)," "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc. Frank Russell Company is
    the owner of trademarks and copyrights relating to the Russell Indexes.
   "Wilshire 4500" and "Wilshire 5000" are trademarks of Wilshire Associates.


<PAGE>   36


                                    VANGUARD
                                   MILESTONES

                                    [GRAPHIC]

                              The Vanguard Group is
                             named for HMS Vanguard,
                        Admiral Horatio Nelson's flagship
                          at the Battle of the Nile on
                          August 1, 1798. Our founder,
                          John C. Bogle, chose the name
                        after reading Nelson's inspiring
                      tribute to his fleet: "Nothing could
                          withstand the squadron . . .
                       with the judgment of the captains,
                      together with their valour, and that
                        of the officers and men of every
                  description, it was absolutely irresistible."

                                    [GRAPHIC]

                          Walter L. Morgan, founder of
                          Wellington Fund, the nation's
                           oldest balanced mutual fund
                        and forerunner of today's family
                           of some 100 Vanguard funds,
                        celebrated his 100th birthday on
                           July 23, 1998. Mr. Morgan,
                         a true investment pioneer, died
                         six weeks later on September 2.

                                    [GRAPHIC]

                                Wellington Fund,
                        The Vanguard Group's oldest fund,
                         was incorporated by Mr. Morgan
                                  70 years ago,
                             on December 28, 1928.
                            The fund was named after
                             the Duke of Wellington,
                              whose forces defeated
                            Napoleon Bonaparte at the
                           Battle of Waterloo in 1815.

[THE VANGUARD GROUP LOGO]

Post Office Box 2600
Valley Forge, Pennsylvania 19482-2600

WORLD WIDE WEB
www.vanguard.com

FUND INFORMATION
1-800-662-7447

INDIVIDUAL ACCOUNT SERVICES
1-800-662-2739

INSTITUTIONAL INVESTOR SERVICES
1-800-523-1036

This report is intended for the funds' shareholders. It may not be distributed
to prospective investors unless it is preceded or accompanied by the current
fund prospectus.


Q122-09/20/1999

(C) 1999 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation, Distributor.








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