VANGUARD EXPLORER FUND INC
N-30D, 2000-06-21
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VANGUARD EXPLORER(TM) FUND

SEMIANNUAL

[PHOTO OF SHIP]

April 30, 2000

[THE VANGUARD GROUP LOGO]

<PAGE>


      HAVE THE PRINCIPLES OF INVESTING CHANGED?

      In a world of frenetic change in business,  technology,  and the financial
markets,  it is natural to wonder whether the basic principles of investing have
changed.

       We don't think so.

       The most  successful  investors  over the coming decade will be those who
began the new century with a fundamental  understanding  of risk and who had the
discipline to stick with long-term investment programs.

   Certainly,  investors  today  confront  a  challenging,  even  unprecedented,
environment.  Valuations of market  indexes are at or near historic  highs.  The
strength and duration of the bull market in U.S.  stocks have inflated  people's
expectations  and  diminished  their  recognition  of the market's  considerable
risks. And the incredible  divergence in stock returns--many  technology-related
stocks  gained  100% or more in 1999,  yet prices fell for more than half of all
stocks--has made some investors question the idea of diversification.

   And then  there is the  Internet.  Undeniably,  it is a  powerful  medium for
communications and transacting business.  For investors,  the Internet is a vast
source  of  information  about  investments,  and  online  trading  has  made it
inexpensive and convenient to trade stocks and invest in mutual funds.

   However, new tools do not guarantee good workmanship.  Information is not the
same as wisdom.  Indeed, much of the information,  opinion, and rumor that swirl
about financial markets each day amounts to "noise" of no lasting  significance.
And the fact  that  rapid-fire  trading  is easy  does  not make it  beneficial.
Frequent trading is almost always  counterproductive  because costs--even at low
commission  rates--and  taxes detract from the returns that the markets provide.
Sadly,  many investors jump into a "hot" mutual fund just in time to see it cool
off.  Meanwhile,  long-term  fund  investors  are  hurt by  speculative  trading
activity because they bear part of the costs involved in accommodating purchases
and redemptions.

     Vanguard  believes that  intelligent  investors  should  resist  short-term
thinking and focus instead on a few time-tested principles:

     o Invest for the long term.  Pursuing your  long-term  investment  goals is
more like a marathon than a sprint.
     o Diversify  your  investments  with  holdings in stocks,  bonds,  and cash
investments.  Remember that, at any moment, some part of a diversified portfolio
will lag other  parts,  and be wary of taking on more risk by "piling  onto" the
best-performing  part of your holdings.  Today's leader could well be tomorrow's
laggard.
     o Step back from the daily  frenzy of the  markets;  focus on your  overall
asset allocation.
     o Capture as much of the market's  return as possible by  minimizing  costs
and taxes.  Costs and taxes  diminish  long-term  returns while doing nothing to
reduce the risks you incur as an investor.

--------------------------------------------------------------------------------
CONTENTS

REPORT FROM THE CHAIRMAN ...........1      PERFORMANCE SUMMARY ..............9

THE MARKETS IN PERSPECTIVE .........5      FUND PROFILE ....................10

REPORT FROM THE ADVISERS ...........7      FINANCIAL STATEMENTS ............12
--------------------------------------------------------------------------------


All  comparative  mutual fund data are from Lipper  Inc. or  Morningstar,  Inc.,
unless otherwise noted.
"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  5000(R)" and "Wilshire  4500" are  trademarks of Wilshire  Associates
Incorporated.

<PAGE>

REPORT FROM THE CHAIRMAN

During the six months ended April 30, 2000,  small-capitalization stocks sizzled
and  Vanguard  Explorer  Fund  achieved  an  outstanding  return of  37.6%.  The
half-year  result  surpassed  the returns of  Explorer's  benchmark  indexes and
matched the average return for small-cap growth funds.

     The table at right compares the six-month total return (capital change plus
reinvested  dividends)  for the fund with those of the  average  peer fund,  the
unmanaged Russell 2000 Index of small-cap  stocks,  and the Small Company Growth
Fund Stock  Index,  which is based on the stocks  held by the  nation's  largest
small-cap mutual funds.

[PHOTO OF JOHN J. BRENNAN]
JOHN J. BRENNAN

     The fund's  return is based on an  increase  in net asset value from $61.49
per share on October 31,  1999,  to $74.61 per share on April 30,  2000,  and is
adjusted for a dividend of $0.23 per share paid from net investment income and a
distribution of $8.03 per share paid from net realized capital gains.

-------------------------------------------------------------------
                                                 TOTAL RETURNS
                                               SIX MONTHS ENDED
                                                APRIL 30, 2000
-------------------------------------------------------------------
Vanguard Explorer Fund                              37.6%
-------------------------------------------------------------------
Average Small-Cap Growth Fund*                      37.6%
-------------------------------------------------------------------
Russell 2000 Index                                  18.7%
-------------------------------------------------------------------
Small Company Growth Fund Stock Index               30.7%
-------------------------------------------------------------------
*Derived from data provided by Lipper Inc.


THE PERIOD IN REVIEW
The U.S. economy displayed  remarkable vigor during the six months.  Its staying
power  was  impressive,  too:  April  marked  the 109th  month of  uninterrupted
expansion--more than nine years without a recession.  Preliminary  estimates for
the first  quarter of 2000  indicated  the  economy was growing at a 5.4% annual
rate, a strong follow-up to the previous quarter's astounding 7.3% rate.

     A growing economy creates a good climate for stocks,  and corporate profits
posted  robust  gains as well.  The  overall  stock  market,  as measured by the
Wilshire 5000 Total Market Index, rose 9.7% for the half-year. However, concerns
about  inflation  and the  high  valuations  of many  technology  stocks  led to
frequent and wide market  fluctuations.  The volatility  was especially  evident
among small-cap and tech issues.  The small-cap Russell 2000 Index, for example,
saw a 35.2% gain from  October  31 through  February  29,  followed  by a -12.2%
decline in March and April,  resulting in an 18.7% half-year return. The index's
growth  component,  a  better  yardstick  for  the  stocks  that  Explorer  Fund
emphasizes (see "Notice to Shareholders" on page 4), gained 27.8% during the six
months,  based on a 58.8%  gain  during  the  first  two-thirds  of the  period,
followed by a -19.5% return during the last third.  The table at right shows the
striking shift in leadership  from growth stocks in the first four months of the
period to value stocks in the final two.

--------------------------------------------------------------------------------
                                                 TOTAL RETURNS
                                 -----------------------------------------------
                                   OCT. 31, 1999,            FEB. 29, 2000,
STOCK INDEX                       TO FEB. 29, 2000          TO APR. 30, 2000
--------------------------------------------------------------------------------
Russell 1000 Growth                     16.3%                     2.1%
Russell 1000 Value                     -10.7                     10.9
--------------------------------------------------------------------------------
Russell 2000 Growth                     58.8%                   -19.5%
Russell 2000 Value                       7.1                      1.1
--------------------------------------------------------------------------------
Nasdaq Composite                        58.8%                   -17.7%
--------------------------------------------------------------------------------
                                                                               1
<PAGE>


     The bull market in stocks  continued  despite three  quarter-point  (0.25%)
increases in  short-term  interest  rates by the Federal  Reserve  Board,  which
boosted its target  federal-funds rate from 5.25% to 6.00%. The yield on 3-month
Treasury bills responded by climbing 74 basis points (0.74 percentage point), to
5.83% as of April 30. However,  long-term interest rates went the other way. The
yield of the 30-year Treasury bond fell 20 basis points, on balance,  ending the
half-year at 5.96%.  The yield of the 10-year  Treasury  note rose only 19 basis
points during the period,  to 6.21%. The overall bond market, as measured by the
Lehman Brothers Aggregate Bond Index, recorded a 1.4% total return.

PERFORMANCE OVERVIEW
Vanguard  Explorer Fund's six-month return of 37.6% was simply  stupendous on an
absolute  basis--providing  in just half a year the  equivalent  of three years'
worth of "normal" stock market  returns.  The fund also did well relative to its
unmanaged  indexes.  But  reflecting the experience of growth stocks in general,
Explorer's  journey  during the half-year was  eventful--a  skyrocket  ride from
November  through  February  (up  52.2%),  followed by a dive in March and April
(down -9.6%).

     Relative to its benchmarks, Explorer owed its strong performance largely to
two sectors:  health care and technology.  Explorer held on average about 18% of
its assets in health-care stocks during the half-year,  versus about 11% for the
Russell    2000   Index.    Small-cap    health    stocks,    led   by   red-hot
biotechnology-related  companies,  gained 45% within the index,  but  Explorer's
holdings in the sector gained nearly 87%.

     Technology was the market's  hottest  sector,  and Explorer's  weighting of
about  one-quarter  of assets in tech  issues was about the same as the  index's
weighting.  But again, Explorer's tech holdings did much better than the overall
market during the period,  returning 72% for the six months, versus 57% for tech
stocks in the index.  Explorer's  tech  weighting  is  smaller  than that of the
typical small-cap growth fund--a distinction that hurt our relative  performance
during the  previous  fiscal year but that proved very  helpful when tech stocks
plunged in March and April.

     Explorer's  advisers  also  added  value  with their  stock  selections  in
financial  services,  where our average  return of 8%  represented a significant
achievement,  given the Russell 2000 Index sector's -4% return. One negative for
the fund during the period was our overweighting  compared with the index in the
consumer-discretionary  group (primarily retail companies).  This sector,  where
Explorer's  advisers committed about one-fifth of the fund's assets,  recorded a
-3% return.

--------------------------------------------------------------------------------
                                                    TOTAL ASSETS MANAGED
                                                     AS OF APRIL 30, 2000
                                                --------------------------------
                                                $ MILLION              PERCENT
--------------------------------------------------------------------------------
Granahan Investment Management, Inc.              $1,429                 35%
Wellington Management Company, LLP                 1,144                 28
Vanguard Quantitative Equity Group                   663                 16
Chartwell Investment Partners                        472                 12
Grantham, Mayo, Van Otterloo & Co. LLC               152                  4
Cash Reserve*                                        214                  5
--------------------------------------------------------------------------------
Total                                             $4,074                100%
--------------------------------------------------------------------------------
*This cash reserve is invested in equity index futures to simulate investment in
 stocks; each adviser may also maintain a modest cash reserve.

          As you know, as of April 3, 2000,  Grantham,  Mayo, Van Otterloo & Co.
LLC (GMO)  was  added to our  roster  of fund  advisers,  each of which  selects
securities  according  to its own  methods  in  pursuit  of the  common  goal of
achieving  long-term  capital  growth.  The addition of GMO increases the fund's
capacity for future growth and brings an additional perspective to the selection
of Explorer's securities. The table at left shows the share of assets managed by
each adviser as of April 30.

2
<PAGE>

IN SUMMARY
During the first half of our fiscal year, the stock market  provided some useful
lessons in  unpredictability.  Daily price swings were  unusually wide and there
was an abrupt change in fashion during the spring,  when high-flying  technology
issues suddenly fell and downtrodden value stocks rose.

     Sudden price movements and shifts in market leadership are certain to occur
now and then, but the timing and duration of such  movements are  unpredictable.
That is why we advocate  diversification and a long-term orientation.  Investors
who maintain exposure to the major asset classes through balanced  portfolios of
growth and value stock funds,  bond funds, and money market funds have generally
found it easier to maintain  equilibrium in turbulent times. We urge you to base
your investment plans on your own goals, time horizon,  and risk  tolerance--and
then to stick with those plans over the long haul.

/s/
John J. Brennan
Chairman and Chief Executive Officer

May 17, 2000

                                                                               3
<PAGE>
--------------------------------------------------------------------------------
NOTICE TO SHAREHOLDERS


CHANGE IN BENCHMARK FOR EXPLORER FUND The Board of Trustees of Vanguard Explorer
Fund has approved a change in the  investment  benchmark  for Explorer  Fund. On
July 31, 2000,  the fund's  benchmark  will change from the Small Company Growth
Fund Stock Index to the Russell 2000 Growth  Index.  The new  benchmark  will be
cited in fund reports to help investors evaluate our relative  performance,  and
it will  help  determine  the  compensation  paid to  four  of the  fund's  five
investment advisers (Vanguard Quantitative Equity Group provides its services on
an at-cost basis). Because the two indexes' characteristics are broadly similar,
the  change  will  have  little  effect  on the  fund's  composition,  policies,
strategies, or risk level.

THE REASON FOR THE CHANGE The Small Company  Growth Fund Stock Index,  which has
been the fund's  benchmark  since August 1997,  is made up of the stocks held by
the 25 largest  small-capitalization  mutual funds.  While this index has been a
suitable  benchmark for Explorer  Fund, the Russell 2000 Growth Index is equally
suitable and is a more widely recognized measure of the performance of small-cap
growth  stocks.  The Trustees  believe that the Russell Index will be easier for
investors to understand and follow.

AMENDING  THE  ADVISORY  CONTRACT  Compensation  for  four  of the  fund's  five
investment  advisers is tied to the fund's  performance  relative to that of its
unmanaged index benchmark.  Accordingly,  the fund's advisory  contracts will be
amended to adopt the new benchmark for determining  compensation  after July 31,
2000. All other terms of the advisory contracts will remain the same.
--------------------------------------------------------------------------------
4

<PAGE>

THE MARKETS IN PERSPECTIVE
SIX MONTHS ENDED APRIL 30, 2000


A surging  economy,  rising  corporate  profits,  and  enthusiasm for technology
stocks  carried  broad stock  market  indexes  higher  during the  volatile  but
generally rewarding six months ended April 30, 2000.

     Stocks rose  despite a modest  pickup in  inflation  and a rise in interest
rates,  both of which did some  damage to bond  prices.  Through  the first four
months of the period,  the stock  market was  dominated  by  optimism  about the
long-term outlook for technology,  telecommunications,  and media companies. But
sentiment then shifted and the tech and telecom groups fell sharply, giving back
some of the spectacular gains achieved over the previous year or so.

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------
                                                           TOTAL RETURNS
                                                      PERIODS ENDED APRIL 30, 2000
                                               ------------------------------------------
                                               6 MONTHS         1 YEAR         5 YEARS*
-----------------------------------------------------------------------------------------
<S>                                            <C>                <C>          <C>
STOCKS
  S&P 500 Index                                  7.2%            10.1%          25.3%
  Russell 2000 Index                            18.7             18.4           15.3
  Wilshire 5000 Index                            9.7             12.2           23.9
  MSCI EAFE Index                                6.8             14.2           10.7
-----------------------------------------------------------------------------------------
BONDS
  Lehman Aggregate Bond Index                    1.4%             1.3%           6.8%
  Lehman 10 Year Municipal Bond Index            2.4             -0.3            6.1
  Salomon Smith Barney 3-Month
     U.S. Treasury Bill Index                    2.7              5.1            5.2
-----------------------------------------------------------------------------------------
OTHER
  Consumer Price Index                           1.8%             3.0%           2.4%
-----------------------------------------------------------------------------------------
*Annualized.
</TABLE>

     For both bond and stock investors,  uncertainty  centered mainly on how the
Federal  Reserve  Board would react to the  surprising  performance  of the U.S.
economy,  which grew at a 7.3% pace in the final  three  months of 1999 and at a
still-robust 5.4% during the first quarter of 2000. With U.S.  unemployment at a
three-decade  low of 3.9%, Fed  policymakers  grew  increasingly  concerned that
inflation was bound to worsen. The Fed raised short-term  interest rates by 0.25
percentage  point  three  times  during  the  six-month  period.  These  boosts,
following  identical increases in June and August of 1999, took the Fed's target
for short-term rates to 6.0%. Yet the economy continued to soar--including  even
the housing and  automobile  sectors,  which often are the first to slow down in
response to higher interest rates.

     Inflation  gauges  provided  ambiguous  readings.  The Consumer Price Index
increased 1.8% and 3.0% for the 6- and 12-month periods ended April 30, but much
of the  acceleration in inflation was due to higher energy and food prices.  The
core inflation rate,  which excludes those sectors,  was up a less-ominous  2.2%
over the year.

U.S. STOCK MARKETS
The  technology  sector,  which  accounts  for  about  one-quarter  of the stock
market's  total  value,  dominated  the  market  during the  half-year,  despite
suffering a sharp setback late in the period.  Even after a -34% fall from March
10 through  mid-April,  the tech-heavy Nasdaq Composite Index registered a 30.8%
return for the six months.

     The overall  stock  market,  as measured by the Wilshire  5000 Total Market
Index,  gained  9.7%.  There was a decided  split in  results  from  large-  and
small-capitalization  stocks.

<PAGE>

The  large-cap S&P 500 Index  returned  7.2%,  while the rest of the U.S.  stock
market gained 19.2%.

     Top performers during the half-year were companies in computer software and
hardware,    semiconductors,    Internet-related    businesses,   and   wireless
communications. Fully half of the 58 companies in the S&P 500's technology group
gained more than 50%,  and the average  return for tech stocks  exceeded  39%. A
number of  tech-related  companies in the  producer-durables  sector also posted
impressive  gains,  and the sector as a whole  returned 32%. A return of 34% was
achieved  by the  oil-drilling  and  services  companies  in the "other  energy"
category,  which benefited from higher oil and gas prices. The  worst-performing
sector was consumer staples (-18%), a category that includes supermarket,  food,
beverage,  and tobacco stocks.  Next in line were  financial-services  companies
(-7%), hurt by higher short-term  interest rates,  which tend to raise borrowing
costs for banks and can lead to increased loan defaults.

U.S. BOND MARKETS
The Federal  Reserve  Board's three rate increases  succeeded in elevating other
short-term rates. For example, yields of 3-month U.S. Treasury bills rose during
the half-year to 5.83%, an increase of 0.74  percentage  point (74 basis points)
that virtually  matched the Fed's target.  However,  long-term rates didn't move
nearly as far. The 10-year Treasury note rose just 19 basis points, to 6.21%, as
of April 30. And yields actually fell a bit for very long-term Treasury bonds, a
result of shrinking supply.  Because of the federal government's budget surplus,
the U.S.  Treasury  decided to reduce issuance of new bonds and to buy back some
of its existing long-term bonds. As investors reacted,  the yield of the 30-year
Treasury declined 20 basis points--from 6.16% to 5.96%--during the half-year.

     The result of higher short-term rates and relatively stable long-term rates
was an unusual  inversion  in the  Treasury  yield  curve.  Instead of the usual
upward-sloping   curve--which   shows   yields   increasing   in   tandem   with
maturities--there  was a  pronounced  drop-off.  As of April  30,  the  yield of
30-year Treasuries was two-thirds of a percentage point below the 6.62% yield on
3-year Treasury notes.

     A similar pattern emerged outside the Treasury market,  although  long-term
yields  remained  above  yields  for  short-term   corporate,   municipal,   and
mortgage-backed  securities.  The overall bond market, as measured by the Lehman
Aggregate  Bond Index,  provided a 1.4% return,  as an average  price decline of
-2.0% offset most of a 3.4% income return.

INTERNATIONAL STOCK MARKETS
Despite  declines in March and April,  stock markets in Europe,  Asia,  and many
emerging  markets  produced  strong  half-year  gains as investors  responded to
improving global economic growth and a rise in corporate  merger-and-acquisition
activity.  However,  many of the gains were  slashed for U.S.  investors  as the
dollar gained  strength  against most other  currencies.  (Conversely,  when the
dollar falls in value, returns from abroad are enhanced for U.S. investors.)

     In U.S.-dollar terms, the overall return from developed foreign markets was
a very solid  6.8%,  as  measured by the Morgan  Stanley  Capital  International
Europe,  Australasia,  Far East Index.  However,  in local currencies,  the EAFE
Index return was 16.4%.

     In Europe,  an average  21.1% gain in  local-currency  terms was reduced to
8.4% for U.S. investors because of the dollar's strength.  Stocks in the Pacific
region,  which is dominated by Japan,  returned 3.6% in dollars,  less than half
the 7.5% gain in local  currencies.  The  Select  Emerging  Markets  Free  Index
returned 12.3% in U.S. dollars, with the biggest gains in Turkey (+148%), Russia
(+123%), and Israel (+50%).

6
<PAGE>


REPORT FROM THE ADVISERS

Vanguard Explorer Fund achieved a 37.6% return during the six months ended April
30, 2000,  the first half of our fiscal year.  This stellar  result  matched the
average return for comparable  funds, but handily outpaced both the 18.7% return
of the Russell 2000 Index of  small-capitalization  stocks and the 30.7% gain of
the Small Company Growth Fund Stock Index.

THE ENVIRONMENT FOR SMALL-CAP STOCKS
The  market's  clear  leaders   during  the  half-year  were  small-cap   growth
stocks--Explorer  Fund's meat and potatoes. The growth stocks within the Russell
2000 Index posted a 27.8% gain,  more than three times the 8.2% return  achieved
by the index's value component. As in 1999, the period's gains were concentrated
in "new economy" stocks,  particularly  technology  companies  (especially those
working on Internet  infrastructure)  and biotechnology  firms (especially those
involved in using human genome research to develop therapies).

     However, starting March 10 there was an abrupt change in market psychology,
and for the remaining seven weeks of the half-year the "new economy" stocks fell
sharply while the "old economy" stocks held up well.

     The market's  sudden  reversal is as  inexplicable  as the logic behind the
extraordinary  run-up in  prices  of  technology  and  biotechnology  companies.
Perhaps, as some commentators suggested, the changeover was due to a realization
that the Federal Reserve Board is likely to continue  tightening monetary policy
until the economy's rapid growth rate starts to moderate.

PERSPECTIVES ON THE FUND'S HOLDINGS
Explorer Fund was not immune to the March-April drop in tech and biotech stocks,
although the blow was  cushioned  somewhat by the fact that we had been cautious
about a number of stocks whose valuations were the most extreme. For example, we
were underrepresented in Internet-related  stocks, a stance that appeared unwise
early in calendar 2000, but turned out to be very beneficial in March and April.
Also,   after  a  number  of  our   biotech   holdings   soared   early  in  the
period--reaching  valuations that appeared to be strained--we  sold  substantial
parts of those positions.

--------------------------------------------------------------------------------
INVESTMENT PHILOSOPHY
The fund reflects a belief that  superior  long-term  investment  results can be
achieved by selecting a diversified group of small-company stocks with prospects
for above-average growth.
--------------------------------------------------------------------------------

     Several biotech  companies--Human  Genome Sciences,  Gene Logic, PE-Celera,
Abgenix, and Genset--were among our top-performing  stocks during the period. We
expect to resume buying in this area when valuations are more  reasonable.  From
the tech sector, winners during the half-year included SeaChange  International,
Wind  River  Systems,   Macrovision,   and  Exchange   Applications.   Satellite
communications  was another strong area for the fund, with names such as Pegasus
Communications, Gilat Satellite, and American Tower.

     The fund also benefited from takeover activity, as a number of our holdings
were acquired or agreed to be acquired,  including Sterling  Software,  PairGain
Technologies, Teltrend, Ardent Software, and Architel Systems.

                                                                               7
<PAGE>

     Among the stocks that hurt our  performance  during the half-year were Ames
Department Stores, Diversinet, and Isis Pharmaceuticals.

     Stocks  new to the  fund,  or in which we added to our  stakes  during  the
period,  included  Core  Laboratories  and  Hanover  Compressor  (in the  energy
sector); brokerage firms Dain Rauscher and Jefferies (financial services); REMEC
and Digital Microwave (technology); Clayton Homes (producer durables); and Jones
Apparel  (consumer  discretionary).  We also were able to add some good consumer
companies  whose  stocks  had  fallen  sufficiently  to bring  them  within  the
small-cap  bailiwick,  including  AnnTaylor and American Eagle Outfitters.  Both
names have terrific brand equity and are generating free cash flow.

     The biggest change in Explorer  Fund's industry  weightings  during the six
months was a decline in exposure to the  consumer-discretionary  group,  a broad
category  that  includes  retailers,   restaurants,   media,  and  entertainment
companies.  The sector fell from 29.0% to 21.6% of the fund's  equity  holdings.
Much of the  decline  stemmed  not from  sales  activity  but  from the  group's
relatively poor performance--our  holdings in the sector posted a -3% return for
the period.

     On balance, only small changes occurred in other sector holdings,  with the
biggest being increases in allocations to the "other energy" group (up from 1.7%
to 4.8% of equities),  technology (from 21.9% to 23.9%),  and producer  durables
(from 7.6% to 9.7%). Our health-care  holdings  increased from 14.7% of equities
last  October  31 to 15.8%  as of  April  30.  If not for  sales of some  highly
appreciated holdings in the health-care and tech groups, our commitments to both
sectors would have increased much more.

     The  newest  member  of  Explorer  Fund's  roster of  investment  advisers,
Grantham,  Mayo,  Van  Otterloo & Co.  (GMO),  began  investing a portion of the
fund's assets on April 3 and had fully  invested its share in individual  stocks
by April 10.

THE OUTLOOK
In  general,  the fund's  holdings  are  registering  strong  growth in profits.
However, it must be noted that rising earnings don't necessarily  translate into
rising stock prices,  particularly  when  valuations are quite high, as they are
now.

     Daily  fluctuations  in the stock market  continue to be extremely  wide by
historical  norms.  The threat of even higher interest rates has chilled some of
the speculation  that drove the market until recently,  and investors seem to be
looking for more substantial reasons to buy stocks than simply a "hot concept."

     We believe that Explorer  Fund's  emphasis on companies with high potential
for  above-average  earnings growth will continue to serve our shareholders well
over the long term.

Granahan Investment Management, Inc.
Wellington Management Company, LLP
Vanguard Quantitative Equity Group
Chartwell Investment Partners
Grantham, Mayo, Van Otterloo & Co. LLC

May 15, 2000

8
<PAGE>

PERFORMANCE SUMMARY
EXPLORER FUND

All of the data on this page represent past performance, which cannot be used to
predict  future returns that may be achieved by the fund.  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.


TOTAL INVESTMENT RETURNS: OCTOBER 31, 1979-APRIL 30, 2000
--------------------------------------------------------------------------------
                              EXPLORER FUND                         RUSSELL
                                                                     2000
FISCAL         CAPITAL           INCOME            TOTAL             TOTAL
YEAR           RETURN            RETURN           RETURN            RETURN
--------------------------------------------------------------------------------
1980            60.7%              2.3%           63.0%              55.3%
1981             8.5               1.1             9.6                4.1
1982            20.5               2.2            22.7               14.8
1983            35.2               1.0            36.2               38.3
1984           -15.3               1.4           -13.9               -3.2
1985             5.4               1.4             6.8               15.8
1986             1.0               1.0             2.0               22.2
1987           -11.5               0.1           -11.4              -13.6
1988            28.2               0.5            28.7               27.1
1989             9.8               1.2            11.0               15.6
1990           -23.9               1.0           -22.9              -27.3
1991            62.5%              2.1%           64.6%              58.6%
1992            12.2               0.8            13.0                9.5
1993            21.9               0.4            22.3               32.4
1994             4.2               0.3             4.5               -0.3
1995            17.0               0.5            17.5               18.3
1996            17.4               0.6            18.0               16.6
1997            18.4               0.5            18.9               29.3
1998           -11.6               0.4           -11.2              -11.8
1999            24.7               0.4            25.1               14.9
2000*           37.2               0.4            37.6               18.7
--------------------------------------------------------------------------------
*Six months ended April 30, 2000.
See  Financial  Highlights  table  on page 24 for  dividend  and  capital  gains
information for the past five years.

<TABLE>
<CAPTION>

AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED MARCH 31, 2000*
----------------------------------------------------------------------------------------------------
                                                                                 10 YEARS
                          INCEPTION                                   ------------------------------
                             DATE           1 YEAR     5 YEARS        CAPITAL      INCOME     TOTAL
----------------------------------------------------------------------------------------------------
<S>                            <C>             <C>       <C>             <C>         <C>       <C>
Explorer Fund              12/11/1967        71.13%     20.91%         17.26%       0.59%     17.85%
----------------------------------------------------------------------------------------------------
</TABLE>

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


                                                                               9
<PAGE>

FUND PROFILE
EXPLORER FUND

This Profile provides a snapshot of the fund's  characteristics  as of April 30,
2000,  compared where  appropriate to an unmanaged  index.  Key elements of this
Profile are defined on page 11.

PORTFOLIO CHARACTERISTICS
---------------------------------------------------------------
                                EXPLORER          RUSSELL 2000
---------------------------------------------------------------
Number of Stocks                     888                 1,781
Median Market Cap                  $1.1B                 $1.0B
Price/Earnings Ratio               18.8x                 17.9x
Price/Book Ratio                    3.5x                  2.7x
Yield                               0.4%                  1.2%
Return on Equity                   14.9%                 13.5%
Earnings Growth Rate               18.6%                 12.5%
Foreign Holdings                    0.8%                  0.0%
Turnover Rate                      144%*                    --
Expense Ratio                     0.71%*                    --
Cash Reserves                       5.1%                    --
*Annualized.


INVESTMENT FOCUS
------------------------------
[grid]
SYTLE                 BLEND
MARKET CAP            SMALL



VOLATILITY MEASURES
-------------------------------------------------
                   EXPLORER               S&P 500
-------------------------------------------------
R-Squared            0.38                  1.00
Beta                 0.89                  1.00



TEN LARGEST HOLDINGS
(% OF TOTAL NET ASSETS)
-------------------------------------------------------------------
Investment Technology Group, Inc.                             1.2%
Maxtor Corp.                                                  1.0
Rational Software Corp.                                       0.8
Vertex Pharmaceuticals, Inc.                                  0.8
Core Laboratories N.V.                                        0.8
Forest Laboratories, Inc.                                     0.7
Caremark Rx, Inc.                                             0.7
Mettler-Toledo International Inc.                             0.7
Pacific Sunwear of California                                 0.7
Equity Residential Properties Trust REIT                      0.7
-------------------------------------------------------------------
Top Ten                                                       8.1%


<TABLE>
<CAPTION>

SECTOR DIVERSIFICATION (% OF COMMON STOCKS)
------------------------------------------------------------------------------------------
                                            APRIL 30, 1999          APRIL 30, 2000
------------------------------------------------------------------------------------------
                                               EXPLORER        EXPLORER      RUSSELL 2000
------------------------------------------------------------------------------------------
<S>                                               <C>            <C>            <C>
Auto & Transportation .................           6.1%           6.5%            3.1%
Consumer Discretionary ................          28.1           21.6            14.6
Consumer Staples ......................           0.3            1.3             2.1
Financial Services ....................          14.2           10.9            16.5
Health Care ...........................          13.8           15.8            11.5
Integrated Oils .......................           0.3            0.1             0.0
Other Energy ..........................           1.9            4.8             3.7
Materials & Processing ................           4.2            3.5             7.4
Producer Durables .....................           7.1            9.7            10.0
Technology ............................          17.8           23.9            24.9
Utilities .............................           4.6            1.6             5.3
Other .................................           1.6            0.3             0.9
------------------------------------------------------------------------------------------
</TABLE>

10
<PAGE>

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  securities.  This
figure does not include cash  invested in futures  contracts  to simulate  stock
investment.

EARNINGS  GROWTH RATE.  The average  annual rate of growth in earnings  over the
past five years for the stocks now in a fund.

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.

FOREIGN HOLDINGS. The percentage of a fund's equity assets represented by stocks
or American Depositary Receipts of companies based outside the United States.

INVESTMENT  FOCUS.  This  grid  indicates  the  focus  of a fund in terms of two
attributes:  market  capitalization  (large,  medium,  or  small)  and  relative
valuation (growth, value, or a blend).

MEDIAN  MARKET  CAP.  An  indicator  of the  size of  companies  in which a fund
invests;  the  midpoint  of  market   capitalization   (market  price  x  shares
outstanding) of a fund's stocks, weighted by the proportion of the fund's assets
invested  in each  stock.  Stocks  representing  half of the fund's  assets have
market  capitalizations  above the median,  and the rest are below it.

NUMBER OF STOCKS. An indicator of diversification. The more stocks a fund holds,
the more  diversified  it is and the more  likely  to  perform  in line with the
overall stock market.

PRICE/BOOK  RATIO.  The share price of a stock divided by its net worth, or book
value,  per share.  For a fund,  the weighted  average  price/book  ratio of the
stocks it holds.

PRICE/EARNINGS  RATIO.  The ratio of a stock's  current  price to its  per-share
earnings over the past year. For a fund, the weighted  average P/E of the stocks
it holds. P/E is an indicator of market expectations about corporate  prospects;
the higher the P/E, the greater the expectations for a company's future growth.

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.

RETURN ON  EQUITY.  The annual  average  rate of return  generated  by a company
during the past five years for each dollar of  shareholder's  equity (net income
divided by  shareholder's  equity).  For a fund, the weighted  average return on
equity for the companies whose stocks it holds.

SECTOR DIVERSIFICATION. The percentages of a fund's common stocks that come from
each of the major  industry  groups that compose the stock  market.

TEN LARGEST HOLDINGS.  The  percentage of net assets that a fund has invested in
its ten largest holdings.  (The average for stock mutual funds is about 35%.) As
this percentage  rises, a fund's returns are likely to be more volatile  because
they are more dependent on the fortunes of a few companies.

TURNOVER RATE. An indication of trading  activity during the period.  Funds with
high  turnover  rates  incur  higher  transaction  costs and are more  likely to
distribute capital gains (which are taxable to investors).

YIELD.  A snapshot of a fund's  income from interest and  dividends.  The yield,
expressed  as a  percentage  of the fund's net asset  value,  is based on income
earned over the past 30 days and is  annualized,  or  projected  forward for the
coming  year.  The  index  yield  is  based on the  current  annualized  rate of
dividends paid on stocks in the index.

                                                                              11
<PAGE>

FINANCIAL STATEMENTS
APRIL 30, 2000 (UNAUDITED)


STATEMENT OF NET ASSETS
This Statement  provides a detailed list of the fund's holdings,  including each
security's market value on the last day of the reporting period.  Securities are
grouped  and  subtotaled  by asset  type  (common  stocks,  bonds,  etc.) and by
industry sector. 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,  you  will  find a table
displaying  the  composition  of the  fund's  net  assets  on both a dollar  and
per-share  basis.  Because all income and any realized gains must be distributed
to  shareholders  each year, the bulk of net assets  consists of Paid in Capital
(money  invested by  shareholders).  The  amounts  shown for  Undistributed  Net
Investment  Income and  Accumulated  Net Realized Gains usually  approximate the
sums the fund had available to distribute to shareholders as income dividends or
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 income or net realized gains, will appear as negative
balances.  Unrealized Appreciation  (Depreciation) is the difference between the
market 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>
---------------------------------------------------------------------------------------------------
                                                                                          MARKET
                                                                                          VALUE*
EXPLORER FUND                                                            SHARES            (000)
---------------------------------------------------------------------------------------------------
COMMON STOCKS (89.3%)+
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>
Auto & Transportation (5.8%)
o Swift Transportation Co., Inc.                                      1,265,450        $  25,387
o(1)M.S. Carriers, Inc.                                               1,008,700           23,956
  Tidewater Inc.                                                        694,000           20,646
o Heartland Express, Inc.                                             1,070,733           18,068
  Skywest, Inc.                                                         423,800           17,852
  Oshkosh Truck Corp.                                                   529,500           16,678
  Polaris Industries, Inc.                                              488,100           14,947
o(1)Mesaba Holdings, Inc.                                             1,165,800           14,572
  Wabash National Corp.                                                 867,400           12,631
o(1)Mesa Air Group Inc.                                               1,923,400           12,501
  C.H. Robinson Worldwide, Inc.                                         213,500           10,674
  Werner Enterprises, Inc.                                              424,000            7,949
  Covenant Transport, Inc.                                              545,000            7,186
o Atlas Air, Inc.                                                       200,000            6,987
  Forward Air Corp.                                                      82,300            2,828
o Knight Transportation, Inc.                                           125,000            2,298
o Tower Automotive, Inc.                                                140,700            2,197
  Superior Industries International, Inc.                                64,500            2,075
  Borg-Warner Automotive, Inc.                                           48,600            2,031
o Landstar System                                                        35,500            2,031
o Stoneridge, Inc.                                                      144,300            1,901
o AirTran Holdings, Inc.                                                427,700            1,817
  Circle International Group, Inc.                                       66,400            1,763
o Monaco Coach Corp.                                                     94,500            1,546
  Meritor Automotive, Inc.                                              100,600            1,508
o Arkansas Best Corp.                                                   110,200            1,425
o Hayes Lemmerz International, Inc.                                      63,400              998
  Audiovox Corp.                                                         11,200              383
  Petroleum Helicopters, Inc.                                            29,200              276
o American Freightways                                                   13,400              249
o Old Dominion Freight Line, Inc.                                        18,700              205
  EGL, Inc.                                                               8,500              194
  Winnebago Industries, Inc.                                              7,100              120
  American Axle & Manufacturing Holdings, Inc.                            5,200               77
o Aftermarket Technology Corp.                                            6,300               72
o National R. V. Holdings, Inc.                                           5,300               64
                                                                                        -----------
                                                                                          236,092
                                                                                        -----------
CONSUMER DISCRETIONARY (19.3%)
o Pacific Sunwear of California                                         851,100           28,990
o Pegasus Communications Corp. Class A                                  261,285           28,513
  The Corporate Executive Board Co.                                     440,200           25,862
o Outback Steakhouse                                                    676,950           22,170
o Learning Tree International, Inc.                                     436,200           20,910
(1)LodgeNet Entertainment Corp.                                         725,000           18,669
o Jones Apparel Group, Inc.                                             600,000           17,813
  Callaway Golf Co.                                                   1,018,200           16,928
o(1)TETRA Technologies, Inc.                                          1,148,200           16,362
  Insight Communications Co., Inc.                                      800,000           16,300
  PrimaCom AG ADR                                                       345,000           14,318
o Diamond Technology Partners Inc.                                      176,700           13,981
  E.W. Scripps Co. Class A                                              275,000           12,839
(1)Vans, Inc.                                                           835,500           12,637
o Furniture Brands
   International Inc.                                                   650,400           12,154
</TABLE>

12
<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
                                                                                          MARKET
                                                                                          VALUE*
                                                                         SHARES            (000)
---------------------------------------------------------------------------------------------------
<S>                                                                       <C>               <C>
  Heidrick & Struggles International, Inc.                              335,800        $  12,089
o Linens `n Things, Inc.                                                379,600           11,720
  Edison Schools Inc.                                                   500,000           11,438
  Central Newspapers, Inc.                                              372,000           11,416
  American Eagle Outfitters, Inc.                                       669,300           11,378
o Premier Parks Inc.                                                    525,000           11,320
o NCO Group, Inc.                                                       326,400           11,220
o Emmis Communications, Inc.                                            256,130           10,886
o Ames Department Stores, Inc.                                          569,150           10,209
  Tweeter Home Entertainment Group, Inc.                                275,800           10,170
  Oneida Ltd.                                                           521,900            9,981
o Borders Group, Inc.                                                   610,000            9,684
o(1)Urban Outfitters, Inc.                                              900,000            9,675
o ShopKo Stores, Inc.                                                   529,000            9,456
  Liz Claiborne, Inc.                                                   198,400            9,188
o AnnTaylor Stores Corp.                                                429,800            8,891
  Dover Downs Entertainment, Inc.                                       705,700            8,645
  On Command Corp.                                                      400,000            8,550
  The Marcus Corp.                                                      783,000            8,368
  Manpower Inc.                                                         233,300            8,238
o The Topps Co., Inc.                                                   935,900            8,189
  Regis Corp.                                                           660,000            7,714
  Latitude Communications, Inc.                                         514,000            7,453
  Penton Media, Inc. Class A                                            275,800            7,257
o BJ's Wholesale Club, Inc.                                             200,000            7,088
o Playboy Enterprises, Inc. Class B                                     438,400            7,069
o Westwood One, Inc.                                                    196,400            6,948
o Nautica Enterprises, Inc.                                             579,300            6,517
o Brightpoint, Inc.                                                     532,200            6,287
  ValueVision International, Inc. Class A                               296,900            5,919
(1)AMC Entertainment, Inc.                                            1,377,500            5,854
  Spanish Broadcasting System, Inc.                                     287,860            5,379
o Speedway Motorsports, Inc.                                            220,000            5,266
  Wink Communications, Inc.                                             237,500            4,691
  Regional Cablesystems, Inc.                                           440,000            4,603
o Activision, Inc.                                                      711,800            4,449
o Insight Enterprises, Inc.                                             105,600            4,415
  New Horizons Worldwide, Inc.                                          240,000            4,230
o Williams-Sonoma, Inc.                                                 120,500            4,172
o United Stationers, Inc.                                               109,100            3,641
o Valassis Communications, Inc.                                         106,100            3,614
o Brinker International, Inc.                                           107,800            3,436
  Ethan Allen Interiors, Inc.                                           119,950            3,201
o Footstar Inc.                                                          85,700            3,187
o Bally Total Fitness Holding Corp.                                     142,300            3,184
  Harman International Industries, Inc.                                  48,200            3,151
o Rare Hospitality International Inc.                                   100,600            3,112
o ACNielson Corp.                                                       134,600            3,104
  Jack in the Box Inc.                                                  126,500            3,099
  i3 Mobile, Inc.                                                       163,900            3,073
  Pier 1 Imports Inc.                                                   266,250            3,029
  Fossil, Inc.                                                          144,900            3,007
o Mohawk Industries, Inc.                                               116,900            2,901
o Venator Group, Inc.                                                   240,700            2,858
o MSC Industrial Direct Co., Inc. Class A                               201,700            2,824
  Ruby Tuesday, Inc.                                                    131,400            2,751
o Timberland Co.                                                         39,600            2,747
  Cox Radio, Inc.                                                        37,700            2,733
o Dollar Thrifty Automotive Group, Inc.                                 130,100            2,732
o Education Management Corp.                                            164,600            2,695
  Meredith Corp.                                                         95,000            2,642
  Tupperware Corp.                                                      139,000            2,624
o Young Broadcasting Inc.                                               121,900            2,621
  Ross Stores, Inc.                                                     124,400            2,581
o Copart, Inc.                                                          147,000            2,536
o The IT Group, Inc.                                                    375,500            2,511
o MAXIMUS, Inc.                                                         103,400            2,436
o Sunglass Hut International, Inc.                                      324,600            2,435
o ADVO, Inc.                                                             80,900            2,427
  Rent-Way, Inc.                                                         92,400            2,397
  Pinnacle Entertainment, Inc.                                          119,300            2,393
o Kenneth Cole Productions, Inc.                                         57,300            2,342
  Midas Inc.                                                             89,200            2,258
  Jostens Inc.                                                           89,300            2,205
o Vail Resorts Inc.                                                     135,900            2,191
  Wallace Computer Services, Inc.                                       200,300            2,191
  Pittston Brink's Group                                                132,089            2,163
o Genesco, Inc.                                                         163,600            2,117
  Landry's Seafood Restaurants, Inc.                                    245,100            2,114
o Choice Hotel International, Inc.                                      159,100            2,098
o NPC International Class A                                             192,500            1,997
  John H. Harland Co.                                                   129,200            1,986
o Buffets Inc.                                                          201,065            1,973
  Collectors Universe, Inc.                                             400,000            1,950
  Banta Corp.                                                            95,500            1,868
o Musicland Stores Corp.                                                246,100            1,846
o QRS Corp.                                                              54,900            1,812
o Teletech Holdings Inc.                                                 55,000            1,794
o Discount Auto Parts Inc.                                              167,800            1,793
  Polaroid Corp.                                                         86,000            1,736
  Stewart Enterprises, Inc. Class A                                     360,000            1,733
o CDI Corp.                                                              77,000            1,733
o Lands' End, Inc.                                                       40,900            1,731
o Mail-Well, Inc.                                                       193,300            1,728
o Lone Star Steakhouse & Saloon, Inc.                                   145,000            1,713
  Media Metrix, Inc.                                                     52,700            1,693
  Talbots Inc.                                                           33,100            1,674
o MemberWorks, Inc.                                                      50,600            1,634
  Burns International Services Corp.                                    147,900            1,608
o The Cheesecake Factory                                                 39,200            1,605
o 24/7 Media, Inc.                                                       79,900            1,568
o Interim Services, Inc.                                                 91,300            1,564
  Rare Medium Group, Inc.                                                71,000            1,460
o Bell & Howell Co.                                                      54,800            1,456
  Wilsons The Leather Experts Inc.                                      114,550            1,389
  MGM Grand, Inc.                                                        46,600            1,375
  Strayer Education, Inc.                                                66,500            1,367
  Cumulus Media Inc.                                                    101,700            1,335
</TABLE>

                                                                              13

<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
                                                                                          MARKET
                                                                                          VALUE*
EXPLORER FUND                                                            SHARES            (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>             <C>
  Oshkosh B Gosh, Inc. Class A                                           80,100        $   1,292
  Movado Group, Inc.                                                    141,600            1,221
  Intimate Brands, Inc.                                                  29,000            1,117
o Administaff, Inc.                                                      26,800            1,079
  Startek, Inc.                                                          20,300            1,043
  Electronics Boutique Holdings Corp.                                    63,800            1,037
  MDC Communications Corp.                                              112,200            1,024
  Tiffany & Co.                                                          13,800            1,003
  P.F. Chang's China Bistro, Inc.                                        27,300              956
o Saks Inc.                                                              78,800              901
  Ziff-Davis Inc.-ZDNet                                                  71,700              892
o Scientific Games Holdings Corp.                                        46,400              858
  Quanta Services, Inc.                                                  18,000              836
  Darden Restaurants Inc.                                                45,200              833
  Braun's Fashions Corp.                                                 34,800              796
o West TeleServices Corp.                                                37,500              792
o Gadzooks, Inc.                                                         34,300              757
  Provant, Inc.                                                         134,700              745
o Chico's Fas, Inc.                                                      39,900              716
o Piercing Pagoda, Inc.                                                  48,150              680
  Westpoint Stevens, Inc.                                                31,900              598
  Block Drug Co. Class A                                                 20,490              584
  Meta Group, Inc.                                                       25,900              583
o Taco Cabana                                                            95,100              577
o Cost Plus, Inc.                                                        18,700              572
o Wackenhut Corrections Corp.                                            68,900              543
  Rent-A-Center, Inc.                                                    26,100              532
o Polo Ralph Lauren Corp.                                                31,600              514
  Applebee's International, Inc.                                         13,600              496
  Blair Corp.                                                            24,900              482
  Ticketmaster Online-City Search, Inc.                                  23,700              474
o Station Casinos, Inc.                                                  15,600              445
  Finlay Enterprises, Inc.                                               43,700              442
  CEC Entertainment Inc.                                                 13,500              405
  The Children's Place Retail Stores, Inc.                               15,600              347
o Dendrite International, Inc.                                           14,600              334
o Donna Karan International Inc.                                         48,000              324
  Salton, Inc.                                                            7,300              313
o Sonic Corp.                                                            11,200              312
  Nu Skin Enterprises, Inc.                                              40,500              311
  SCP Pool Corp.                                                          7,600              280
  Entercom Communications Corp.                                           6,500              276
  JAKKS Pacific, Inc.                                                    14,400              265
o Papa John's International, Inc.                                         9,400              259
o Men's Wearhouse, Inc.                                                  12,000              257
o Quiksilver, Inc.                                                       13,000              245
o ACTV, Inc.                                                             12,700              230
  Navigant Consulting, Inc.                                              22,100              220
o Factory 2-U Stores Inc.                                                 6,500              217
  Media General, Inc. Class A                                             4,300              212
o O'Reilly Automotive, Inc.                                              15,200              205
o On Assignment, Inc.                                                     6,500              204
o Windmere-Durable Holdings Inc.                                         12,600              202
o 99 Cents Only Stores                                                    4,900              184
  Korn/Ferry International                                                6,900              183
  Radio One, Inc.                                                         3,100              180
  Pegasus Systems Inc.                                                    9,700              172
  Career Education Corp.                                                  4,100              155
o SITEL Corp.                                                            22,000              151
  THQ Inc.                                                                9,700              150
o WMS Industries, Inc.                                                   16,700              146
o Guess ?, Inc.                                                           5,300              146
  Direct Focus, Inc.                                                      4,300              141
  Gaylord Entertainment Co. Class A                                       5,500              132
  Cato Corp. Class A                                                     12,200              129
o ITT Educational Services, Inc.                                          7,100              127
  Waste Connections, Inc.                                                 9,800              123
o Trans World Entertainment Corp.                                        10,700              112
o Romac International, Inc.                                              10,800              111
  Shop At Home, Inc.                                                     17,500              110
  Haverty Furniture Cos., Inc.                                            9,700              109
o Michaels Stores, Inc.                                                   2,700              106
  Whitehall Jewellers, Inc.                                               5,200               89
o Midway Games Inc.                                                      12,200               81
o Championship Auto Racing Teams, Inc.                                    3,900               79
  Beyond.com Corp.                                                       29,600               65
  CDnow Inc.                                                             14,900               64
o CSK Auto Corp.                                                          5,900               62
o Jo-Ann Stores, Inc. Class A                                             5,400               50
o Group 1 Automotive, Inc.                                                3,600               43
  Charles River Associates Inc.                                           2,100               43




o Lason Holdings, Inc.                                                    9,000               41
  e4L, Inc.                                                              19,000               26
  Cyberian Outpost, Inc.                                                  4,600               24
                                                                                        -----------
                                                                                          787,122
                                                                                        -----------
CONSUMER STAPLES (1.1%)
o Beringer Wine Estates
   Holdings, Inc.                                                       377,000           13,619
o Rexall Sundown, Inc.                                                  546,500           10,520
  Fleming Cos., Inc.                                                    427,000            7,019
o American Italian Pasta Co.                                            126,400            3,128
  Del Monte Foods Co.                                                   272,700            2,420
  Universal Corp.                                                       128,200            2,420
  Dreyer's Grand Ice Cream, Inc.                                         62,900            1,510
  Celestial Seasonings, Inc.                                             40,600            1,365
o Aurora Foods Inc.                                                     260,900            1,256
  Schweitzer-Mauduit
   International, Inc.                                                   77,800            1,133
  7-Eleven, Inc.                                                        166,200              623
  International Multifoods Corp.                                         27,300              350
  Church & Dwight, Inc.                                                  15,800              282
o Hain Food Group, Inc.                                                   9,200              247
o Smithfield Foods, Inc.                                                 10,600              226
o Performance Food Group Co.                                              4,500              119
  Pilgrim's Pride Corp.                                                  10,500               78
                                                                                        -----------
                                                                                           46,315
                                                                                        -----------
FINANCIAL SERVICES (9.7%)
  Investment Technology
   Group, Inc.                                                         1,303,921          48,897
  Equity Residential Properties Trust REIT                               628,000          28,574
  Sun Communities, Inc. REIT                                             753,900          24,973
  Manufactured Home Communities, Inc. REIT                               699,250          17,481
o Affiliated Computer Services, Inc. Class A                             473,600          15,688
</TABLE>
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                                                                                          MARKET
                                                                                          VALUE*
                                                                          SHARES           (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>              <C>
o BISYS Group, Inc.                                                      237,400       $  14,852
o Concord EFS, Inc.                                                      659,175          14,749
  Jefferies Group, Inc.                                                  660,000          14,561
  Regency Realty Corp. REIT                                              600,000          13,275
  Dain Rauscher Corp.                                                    208,000          12,883
o Nova Corp. (Georgia)                                                   407,200          12,878
  Cullen/Frost Bankers, Inc.                                             520,000          12,838
  Federal Realty Investment Trust REIT                                   597,000          12,686
  Pinnacle Holdings Inc. REIT                                            197,250          11,083
  Fidelity National Financial, Inc.                                      732,615          10,806
  Heller Financial, Inc.                                                 520,000          10,108
  Annuity and Life Re (Holdings), Ltd.                                   400,000           8,650
  S1 Corp.                                                               144,400           7,843
  National Data Corp.                                                    275,000           7,631
  First Washington Realty Trust, Inc. REIT                               300,000           6,244
o AmeriCredit Corp.                                                      260,600           4,870
  Labranche & Co. Inc.                                                   373,075           4,454
  Saul Centers, Inc. REIT                                                262,000           4,045
  Radian Group, Inc.                                                      66,600           3,392
  Hudson United Bancorp                                                  149,536           3,374
  Downey Financial Corp.                                                 107,000           3,197
  Financial Security Assurance Holdings Ltd.                              38,700           2,857
o Affiliated Managers Group, Inc.                                         67,700           2,716
o Barra, Inc.                                                             63,300           2,667
  The PMI Group Inc.                                                      52,400           2,538
  SEI Corp.                                                               21,000           2,507
  WestAmerica Bancorporation                                              97,300           2,439
o Golden State Bancorp Inc.                                              157,000           2,414
  Washington Federal Inc.                                                136,360           2,378
  Commerce Group, Inc.                                                    75,800           2,236
  XTRA Corp.                                                              44,500           2,092
  Wit Capital Group, Inc.                                                195,000           2,060
  First Midwest Bancorp                                                   80,600           2,005
  AmerUs Life Holdings, Inc.                                              95,390           1,902
  Legg Mason Inc.                                                         48,200           1,823
  John Nuveen Co. Class A                                                 43,800           1,747
  Presidential Life Corp.                                                102,300           1,629
  TCF Financial Corp.                                                     68,200           1,594
  Jack Henry & Associates                                                 35,800           1,414
  The MONY Group Inc.                                                     45,700           1,414
  U.S. Trust Corp.                                                         8,900           1,369
  McGrath Rent Corp.                                                      83,900           1,345
  Erie Indemnity Co. Class A                                              44,800           1,333
  Oriental Financial Group                                                72,700           1,236
o Hamilton Bancorp, Inc.                                                  63,700           1,170
o Advent Software, Inc.                                                   22,000           1,155
  First Federal Capital Corp.                                             93,900           1,080
  Commonwealth Bancorp                                                    81,600           1,061
  Metris Cos., Inc.                                                       23,800             893
  St. Francis Capital Corp.                                               60,900             864
  Texas Regional Bancshares, Inc.                                         27,400             783
  MeriStar Hospitality Corp. REIT                                         39,100             772
o First Federal Financial Corp.                                           57,500             719
  Phoenix Investment Partners Ltd.                                        81,100             705
  Hartford Life, Inc.                                                     14,200             699
  Farm Family Holdings, Inc.                                              21,300             607
  Nationwide Financial Services, Inc.                                     21,600             601
  ITLA Capital Corp.                                                      41,400             567
  Federated Investors, Inc.                                               18,900             534
o Imperial Credit                                                        132,000             512
  Stifel Financial Corp.                                                  46,798             500
  Investors Financial Services Corp.                                       5,400             441
o The Profit Recovery Group International, Inc.                           22,300             392
  Columbia Banking System, Inc.                                           29,187             359
o Triad Guaranty, Inc.                                                    16,700             351
  Arthur J. Gallagher & Co.                                                8,800             328
  First Commonwealth Financial Corp.                                      27,600             321
  Associated Banc-Corp.                                                   12,000             307
  Commerce Bancorp, Inc.                                                   7,400             294
  Southwest Securities Group, Inc.                                         6,300             259
  Professionals Group, Inc.                                               13,600             241
  Corus Bankshares Inc.                                                    9,452             236
  Susquehanna Bancshares, Inc.                                            17,100             236
  Greater Bay Bancorp                                                      5,500             234
  Eaton Vance Corp.                                                        4,900             207
  FactSet Research Systems Inc.                                            6,600             190
o Pegasystems Inc.                                                        19,600             174
  Harbor Florida Bancshares, Inc.                                         15,400             162
  East West Bancorp, Inc.                                                 12,700             159
  Hilb, Rogal and Hamilton Co.                                             5,300             150
  Cousins Properties, Inc. REIT                                            3,700             145
  Queens County Bancorp, Inc.                                              5,700             116
  E.W. Blanch Holdings, Inc.                                               4,700             105
o Financial Federal Corp.                                                  5,500             102
  Charles E. Smith Residential Realty, Inc. REIT                           2,600              98
o Data Broadcasting Corp.                                                 17,500              86
  CVB Financial Corp.                                                      5,200              84
  Frontier Financial Corp.                                                 3,800              72
  Medallion Financial Corp.                                                4,100              68
  FiNet.com, Inc.                                                         68,500              60
  First Source Corp.                                                       2,800              58
  CyberCash, Inc.                                                          7,000              52
  SierraCities.com, Inc.                                                   7,800              47
                                                                                        -----------
                                                                                         395,103
                                                                                        -----------
HEALTH CARE (14.1%)
o Vertex Pharmaceuticals, Inc.                                          610,100           31,878
o Forest Laboratories, Inc.                                             355,000           29,842
  Caremark Rx, Inc.                                                   4,617,500           29,437
o Genzyme Corp. General Division                                        541,700           26,442
  DENTSPLY International Inc.                                           775,700           22,544
o Gilead Sciences, Inc.                                                 361,000           19,562
  Abgenix, Inc.                                                         197,700           17,707
  Varian Medical Systems, Inc.                                          439,800           17,592
o Chiron Corp.                                                          385,000           17,421
  BioChem Pharma Inc.                                                   730,000           16,790
o Cytyc Corp.                                                           339,300           15,184
o Millennium Pharmaceuticals, Inc.                                      174,256           13,832
o Lincare Holdings, Inc.                                                444,900           13,569
o IDX Systems Corp.                                                     780,300           13,216
o Regeneron   Pharmaceuticals, Inc.                                     430,000           12,282
o Coventry Health Care Inc.                                           1,149,600           12,215

</TABLE>
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                                                                                          MARKET
                                                                                          VALUE*
EXPLORER FUND                                                            SHARES            (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>             <C>
o Foundation Health Systems
   Class A                                                            1,207,700        $  12,152
  Medarex, Inc.                                                         200,000           10,600
o I-STAT Corp.                                                          775,000           10,027
  United Therapeutics Corp.                                             170,500            9,633
  Arrow International, Inc.                                             279,500            9,538
  PE Corp.-Celera Genomics
   Group                                                                114,800            9,471
o(1)Matria Healthcare, Inc.                                           2,100,000            9,319
  Cell Genesys, Inc.                                                    498,500            9,316
o Human Genome Sciences, Inc.                                           121,600            9,310
o Protein Design Labs, Inc.                                              80,600            8,181
  Kissei Pharmaceutical Co., Ltd.                                       479,000            7,850
  PolyMedica Corp.                                                      136,300            7,318
o Acuson Corp.                                                          500,000            6,156
  Gene Logic Inc.                                                       220,000            5,913
  Cubist Pharmaceuticals, Inc.                                          182,500            5,863
  Bindly Western Industries, Inc.                                       308,400            5,378
o Sybron International Corp.                                            158,000            4,918
  QLT PhotoTherapeutics Inc.                                             82,100            4,562
  ICN Pharmaceuticals, Inc.                                             179,000            4,509
o Universal Health Services
   Class B                                                               80,400            4,402
o Isis Pharmaceuticals, Inc.                                            394,000            4,383
  Allscripts, Inc.                                                      138,400            4,290
  Endocare, Inc.                                                        252,300            4,163
o Biotechnology General                                                 279,000            3,923
o Zoll Medical Corp.                                                     83,100            3,672
o Wesley Jessen VisionCare, Inc.                                         93,200            3,670
  Albany Molecular Research, Inc.                                        82,800            3,633
o Priority Healthcare Corp.
   Class B                                                               63,900            3,538
o Kensey Nash Corp.                                                     264,200            3,435
  Invitrogen Corp.                                                       51,200            3,194
  Ebenx Inc.                                                            191,700            3,148
o Oxford Health Plan                                                    152,600            2,899
o Trigon Healthcare, Inc.                                                79,600            2,861
o Quest Diagnostics, Inc.                                                49,100            2,857
o IDEXX Laboratories Corp.                                              106,000            2,783
o Apria Healthcare                                                      188,900            2,633
o Beverly Enterprises, Inc.                                             773,900            2,612
o INCYTE Pharmaceuticals, Inc.                                           32,800            2,526
  ORATEC Interventions, Inc.                                             72,200            2,459
o ImClone Systems, Inc.                                                  25,900            2,357
o Transkaryotic Therapies, Inc.                                          75,000            2,245
  Eclipsys Corp.                                                        278,105            2,225
  Cooper Cos., Inc.                                                      63,900            2,149
  Alpharma, Inc. Class A                                                 53,400            2,063
  Rehabcare Corp.                                                        58,500            1,744
  Jones Pharma, Inc.                                                     54,575            1,572
o Ventana Medical Systems, Inc.                                          55,300            1,559
o Mid Atlantic Medical
   Services, Inc.                                                       163,900            1,526
o AmeriPath, Inc.                                                       190,700            1,490
o The Liposome Co., Inc.                                                 84,200            1,474
  Aurora Biosciences Corp.                                               39,050            1,416
  Celgene Corp.                                                          24,300            1,144
o Techne                                                                 16,000            1,138
o STERIS Corp.                                                          124,100            1,117
  Sunquest Information Systems, Inc.                                     96,600            1,099
  Alexion Pharmaceuticals, Inc.                                          22,500            1,004
o Cephalon, Inc.                                                         17,000              956
  CuraGen Corp.                                                          28,600              761
o QuadraMed Corp.                                                       187,200              731
o Pharmaceutical Product Development, Inc.                               42,300              711
  ArQule, Inc.                                                           59,500              703
  Minntech Corp.                                                         80,600              685
o ProxyMed, Inc.                                                        400,000              650
o Cor Therapeutics, Inc.                                                  8,400              640
  Cyberonics, Inc.                                                       31,300              638
o Express Scripts                                                        17,500              626
o IDEC Pharmaceuticals Corp.                                              9,700              621
o ResMed Inc.                                                            18,000              612
o MedQuist, Inc.                                                         16,400              581
  American Retirement Corp.                                              76,200              572
  Nabi                                                                  115,800              557
o Chirex, Inc.                                                           31,000              527
o Patterson Dental Co.                                                   10,000              481
  King Pharmaceuticals, Inc.                                              9,300              459
o Ocular Sciences, Inc.                                                  27,100              449
  Varian, Inc.                                                           12,300              447
  Mallinckrodt, Inc.                                                     16,100              433
o Magellan Health Services, Inc.                                        109,600              411
  Mentor Corp.                                                           23,200              410
  Hooper Holmes, Inc.                                                    23,000              400
o Renal Care Group, Inc.                                                 17,500              390
  Enzon, Inc.                                                            10,100              376
  Diagnostic Products Corp.                                              11,400              350
o Orthodontic Centers of America, Inc.                                   15,900              337
o Pediatrix Medical Group, Inc.                                          40,400              333
o Noven Pharmaceuticals, Inc.                                            28,200              331
o Alkermes, Inc.                                                          5,900              314
  Novoste Corp.                                                           7,300              299
o Enzo Biochem, Inc.                                                      6,800              275
o Summit Technology, Inc.                                                30,600              272
o Laboratory Corp. of America                                            43,700              259
  Stericycle, Inc.                                                       11,900              250
o Ligand Pharmaceuticals Inc. Class B                                    17,700              237
o Affymetrix, Inc.                                                        1,600              216
  OraPharma, Inc.                                                        20,000              204
o AmeriSource Health Corp.                                               10,100              202
o Syncor International Corp.                                              4,700              194
  Coulter Pharmaceutical, Inc.                                            9,900              181
o Sangstat Medical Corp.                                                  6,300              181
o Cygnus Inc.                                                            14,500              181
  Province Healthcare Co.                                                 6,200              179
o Theragenics Corp.                                                      17,600              175
o First Health Group Corp.                                                5,500              167
o PathoGenesis Corp.                                                      6,800              145
o Columbia Laboratories Inc.                                             15,100              143
  Gliatech Inc.                                                           8,500              130
  LifePoint Hospitals, Inc.                                               7,600              130
  Corixa Corp.                                                            3,600              111
o Algos Pharmaceutical Corp.                                              7,300              110
o Advance Paradigm, Inc.                                                  8,400              105
o Biomatrix, Inc.                                                         5,400              103
o LCA-Vision, Inc.                                                       23,800               86
</TABLE>

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                                                                                           MARKET
                                                                                           VALUE*
                                                                         SHARES             (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>
  LaserSight Inc.                                                        14,700        $      74
o Duramed Pharmaceuticals, Inc.                                          12,500               59
o Bio-Rad Laboratories, Inc. Class A                                      1,900               48
o Trex Medical Corp.                                                     16,600               46
                                                                                        -----------
                                                                                          575,184
                                                                                        -----------
INTEGRATED OILS (0.1%)
o Tesoro Petroleum Corp.                                                241,800             2,841
                                                                                        -----------
OTHER ENERGY (4.3%)
  Core Laboratories N.V.                                              1,083,100           30,733
o Hanover Compressor Co.                                                300,000           17,475
o Marine Drilling Co., Inc.                                             669,400           17,404
  St. Mary Land & Exploration Co.                                       455,000           15,356
  Chieftain International, Inc.                                         599,900           11,398
o Noble Drilling Corp.                                                  250,000            9,984
o Global Industries Ltd.                                                530,000            7,553
  Weatherford International, Inc.                                       160,100            6,504
o UTI Energy Corp.                                                      169,750            5,899
  ENSCO International, Inc.                                             158,800            5,270
o Rowan Cos., Inc.                                                      183,500            5,127
  Spinnaker Exploration Co.                                             213,040            4,953
o National-Oilwell, Inc.                                                176,500            4,225
o Newfield Exploration Co.                                               88,300            3,587
o Forest Oil Corp.                                                      256,400            2,868
  Vintage Petroleum, Inc.                                               141,800            2,818
o SEACOR SMIT Inc.                                                       45,700            2,799
  Equitable Resources, Inc.                                              57,200            2,653
  Noble Affiliates, Inc.                                                 64,400            2,322
o HS Resources Inc.                                                      95,300            2,305
  Cross Timbers Oil Co.                                                 153,300            2,213
o Stone Energy Corp.                                                     38,100            1,800
  Helmerich & Payne, Inc.                                                48,000            1,503
  Tom Brown, Inc.                                                        78,700            1,495
o Grey Wolf, Inc.                                                       317,200            1,289
  Pride International Inc.                                               47,500            1,075
o Veritas DGC Inc.                                                       27,100              650
  Penn Virginia Corp.                                                    30,000              540
o Patterson Energy, Inc.                                                 16,800              475
  Pogo Producing Co.                                                     15,800              405
  Ocean Energy, Inc.                                                     30,800              398
o Seitel, Inc.                                                           57,400              359
o Barrett Resources Corp.                                                 8,600              273
  Chesapeake Energy Corp.                                                59,300              222
o Nuevo Energy Co.                                                        6,000              105
o The Meridian Resource Corp.                                            28,700              104
o Plains Resources                                                        6,000               85
o Newpark Resources, Inc.                                                 8,300               68
                                                                                        -----------
                                                                                         174,292
                                                                                        -----------
MATERIALS & PROCESSING (3.1%)
  Cambrex Corp.                                                         300,000           12,300
o Cytec Industries, Inc.                                                400,000           12,050
  Polymer Group, Inc.                                                   784,500            9,120
  Granite Construction Co.                                              377,200            8,959
  Nagase & Co., Ltd.                                                  2,100,000            7,190
o Bethlehem Steel Corp.                                               1,200,000            6,450
  Wellman, Inc.                                                         300,000            6,413
  Freeport-McMoRan Copper & Gold Inc. Class B                           600,000            5,775
  Valmont Industries, Inc.                                              256,100            5,090
o Insituform Technologies Class A                                       123,000            4,128
  Grant Prideco, Inc.                                                   214,000            4,120
  OM Group, Inc.                                                         65,800            3,027
o Catellus Development Corp.                                            230,600            2,998
o Agribrands International, Inc.                                         73,800            2,763
  Allegheny Technologies Inc.                                           101,700            2,460
o Fairfield Communities, Inc.                                           261,800            2,373
  Corn Products International, Inc.                                      95,700            2,297
  Texas Industries, Inc.                                                 66,700            2,176
  Spartech Corp.                                                         53,400            1,856
o U.S. Can Corp.                                                        100,300            1,843
  Centex Construction Products,Inc.                                      56,800            1,754
  U.S. Plastic Lumber Corp.                                             371,100            1,624
o Cadiz Inc.                                                            219,200            1,589
  American Superconductor Corp.                                          40,700            1,554
o Buckeye Technology, Inc.                                               80,900            1,547
o Dal-Tile International Inc.                                           154,400            1,505
o Paxar Corp.                                                           145,900            1,486
  Ethyl Corp.                                                           437,000            1,366
  Carpenter Technology Corp.                                             67,600            1,356
  Ferro Corp.                                                            49,300            1,128
  Lilly Industries Inc. Class A                                          84,200              916
o Dycom Industries, Inc.                                                 15,200              790
o Silgan Holdings, Inc.                                                  52,900              681
o Stillwater Mining Co.                                                  22,300              624
  Commonwealth Industries Inc.                                           73,900              554
  Owens Corning                                                          25,600              466
  Georgia Gulf Corp.                                                     18,600              448
  BMC Industries, Inc.                                                   81,800              409
  USEC Inc.                                                              84,800              398
  Quanex Corp.                                                           22,600              370
o Advanced Lighting
   Technologies, Inc.                                                    21,200              323
o Maverick Tube Corp.                                                    11,200              319
  AMCOL International Corp.                                              14,200              233
  W.R. Grace & Co.                                                       17,000              221
o Lone Star Technologies, Inc.                                            4,000              185
  Brady Corp. Class A                                                     5,600              165
  Battle Mountain Gold Co.
   Class A                                                               75,300              155
o Steel Dynamics, Inc.                                                   13,500              154
  Geon Co.                                                                6,700              147
  H.B. Fuller Co.                                                         3,400              131
  Elcor Corp.                                                             3,900              124
o Gaylord Container Corp.                                                21,200              109
o Earthshell Corp.                                                       28,400               92
  LSI Industries Inc.                                                     3,900               70
o Crestline Capital Corp.                                                 4,000               69
o Insignia Financial Group, Inc.                                          3,000               31
  American Pad & Paper Co.                                              107,600               14
                                                                                        -----------
                                                                                          126,495
                                                                                        -----------
PRODUCER DURABLES (8.7%)
o Mettler-Toledo International Inc.                                     844,100           29,121
  Polycom, Inc.                                                         331,300           26,214
o American Power
   Conversion Corp.                                                     591,000           20,870
o Plantronics, Inc.                                                     233,400           20,656
o Waters Corp.                                                          197,000           18,715
  Clayton Homes Inc.                                                  1,604,500           15,243

</TABLE>
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<CAPTION>
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                                                                                          MARKET
                                                                                          VALUE*
EXPLORER FUND                                                            SHARES            (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>
o American Tower Corp. Class A                                          300,000        $  13,950
  Cohu, Inc.                                                            322,200           12,264
o Palm Harbor Homes, Inc.                                               683,108           11,271
o PRI Automation, Inc.                                                  136,100           10,871
  Brooks Automation, Inc.                                               112,300           10,072
  MKS Instruments, Inc.                                                 179,400            8,432
  Moritex Corp.                                                         110,000            8,245
o Zygo Corp.                                                            304,200            7,757
o E-Tek Dynamics, Inc.                                                   34,400            7,043
  Lindsay Manufacturing Co.                                             392,750            7,020
o ATMI, Inc.                                                            179,800            6,922
o AstroPower, Inc.                                                      325,000            6,642
o DuPont Photomasks, Inc.                                               112,475            6,306
  Donaldson Co., Inc.                                                   271,000            6,301
  SpeedFam-IPEC, Inc.                                                   376,500            5,953
o Credence Systems Corp.                                                 38,800            5,539
o Adaptive Broadband Corp.                                              154,200            5,012
  Therma-Wave Inc.                                                      167,650            4,610
o Crown Castle International Corp.                                      113,500            4,356
  Newport News Shipbuilding Inc.                                        118,900            3,968
o Alliant Techsystems, Inc.                                              51,000            3,551
  Varian Semiconductor
   Equipment Associates, Inc.                                            50,800            3,416
o LTX Corp.                                                              72,400            3,312
o Electroglas, Inc.                                                      79,000            3,061
  SpectraLink Corp.                                                     210,200            3,035
  Ametek Aerospace Products Inc.                                        144,000            2,961
o Kulicke & Soffa Industries, Inc.                                       36,800            2,882
o NVR, Inc.                                                              44,800            2,789
o Mastec Inc.                                                            30,500            2,634
  Cordant Technologies, Inc.                                             45,100            2,554
  Herman Miller, Inc.                                                    86,900            2,379
  Graco, Inc.                                                            65,000            2,202
  Mark IV Industries, Inc.                                               99,000            2,098
  Briggs & Stratton Corp.                                                52,000            1,996
o LAM Research Corp.                                                     41,300            1,895
  X-Rite Inc.                                                           162,400            1,857
  MDC Holdings, Inc.                                                     96,800            1,845
  NACCO Industries, Inc. Class A                                         39,100            1,755
o Magnatek                                                              209,500            1,741
  Applied Industrial
   Technology, Inc.                                                      88,600            1,539
  Standex International Corp.                                            89,500            1,471
o Esterline Technologies Corp.                                          110,700            1,342
o Novellus Systems, Inc.                                                 19,000            1,267
o Silicon Valley Group, Inc.                                             43,800            1,248
  Terayon Communications
   Systems, Inc.                                                         13,300            1,237
  inTEST Corp.                                                           52,500            1,175
  Inter-Tel, Inc.                                                        54,800            1,110
  Photon Dynamics, Inc.                                                  14,900            1,103
o California Amplifier, Inc.                                             37,000              999
o Genrad, Inc.                                                          128,000              952
o Asyst Technologies, Inc.                                               16,100              861
o Scott Technologies, Inc.                                               38,700              755
o Electro Scientific Industries, Inc.                                    11,700              738
  Helix Technology Corp.                                                 12,600              643
  Pulte Corp.                                                            24,400              525
o Advanced Energy Industries, Inc.                                        7,000              483
  Tut Systems, Inc.                                                       8,200              394
o Comdial Corp.                                                          29,200              361
o Cymer, Inc.                                                             9,000              352
  Manitowac Co., Inc.                                                     9,300              309
o Cognex Corp.                                                            5,400              307
  C & D Technology Inc.                                                   4,700              303
  D. R. Horton, Inc.                                                     22,200              287
  Power-One, Inc.                                                         4,000              273
o Interdigital Communications Corp.                                      11,900              246
o C-COR Electronics, Inc.                                                 6,100              239
  Stewart & Stevenson Services, Inc.                                     17,300              209
o Kent Electronics Corp.                                                  7,000              204
  Astec Industries, Inc.                                                  8,000              201
o Vicor Corp.                                                             6,100              159
  Technitrol, Inc.                                                        2,100              143
o Rayovac Corp.                                                           6,700              140
  Standard Pacific Corp.                                                 12,900              130
  Kennametal, Inc.                                                        4,500              129
  JLG Industries, Inc.                                                   12,200              116
o Terex Corp.                                                             7,200              113
  Dynatech Corp.                                                         12,650              112
  Transcrypt International, Inc.                                          8,400               24
  Arguss Holdings, Inc.                                                     100                2


                                                                                        -----------
                                                                                          353,517
                                                                                        -----------
TECHNOLOGY (21.3%)
  Maxtor Corp.                                                        3,361,400           40,127
o Rational Software Corp.                                               385,000           32,773
  Quantum Corp.-
   Hard Disk Drive                                                    2,200,000           25,713
  Cognos Inc.                                                           639,800           23,993
o Avant! Corp.                                                        1,302,900           23,452
o Verity, Inc.                                                          690,000           22,382
o Advanced Fibre
   Communications, Inc.                                                 488,825           22,333
o Westell Technologies, Inc.
   Class A                                                              776,780           22,090
o Remedy Corp.                                                          389,500           20,692
o Burr-Brown Corp.                                                      281,800           19,198
  ANADIGICS, Inc.                                                       248,700           18,715
o Aspen Technology, Inc.                                                500,000           17,688
o REMEC, Inc.                                                           450,300           17,083
  AirGate PCS, Inc.                                                     190,700           16,353
o Oak Technology, Inc.                                                1,159,057           16,299
o Informix Corp.                                                      1,473,000           16,203
o Sybase, Inc.                                                          765,600           15,456
o Digital Microwave Corp.                                               405,400           14,974
o Semtech Corp.                                                         219,250           14,950
o Mercury Interactive Corp.                                             157,430           14,169
o S3, Inc.                                                            1,000,000           14,063
o Trimble Navigation Ltd.                                               495,400           13,685
o Acxiom Corp.                                                          489,140           13,207
o TriQuint Semiconductor, Inc.                                          124,400           12,790
o Sensormatic Electronics Corp.                                         763,500           12,741
o Electronics for Imaging, Inc.                                         232,300           12,138
  Gartner Group, Inc. Class A                                           850,000           11,475
o Integrated Silicon Solution, Inc.                                     371,700           11,360
o Documentum, Inc.                                                      182,600           10,773
  Methode Electronics, Inc.
   Class A                                                              250,000           10,418
  Internet Pictures Corp.                                               658,800           10,376
  Extreme Networks, Inc.                                                174,575           10,060
</TABLE>

18
<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
                                                                                           MARKET
                                                                                           VALUE*
                                                                         SHARES             (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>
o Ceridian Corp.                                                        400,000        $   8,675
o RealNetworks, Inc.                                                    171,400            8,163
  Ditech Communications Corp.                                            93,800            8,043
o P-Com, Inc.                                                           715,500            7,736
o Manugistics Group, Inc.                                               179,600            7,689
  iVillage Inc.                                                         754,800            7,595
  Alteon Websystems, Inc.                                               110,950            7,545
  SeaChange International, Inc.                                         245,850            7,376
  SERENA Software, Inc.                                                 327,450            7,163
o Western Digital Corp.                                               1,000,000            6,938
o Actel Corp.                                                           185,100            6,814
  eSPEED, Inc.                                                          138,100            6,525
o Davox Corp.                                                           250,000            6,375
  Inet Technologies, Inc.                                               146,240            6,307
  Optibase Ltd.                                                         325,000            6,155
  Exar Corp.                                                             76,200            6,109
  Marimba, Inc.                                                         303,000            6,003
  Powerwave Technologies, Inc.                                           28,000            5,826
  Macrovision Corp.                                                     109,500            5,352
  Micromuse Inc.                                                         52,700            5,171
o New Era of Networks, Inc.                                             161,900            5,080
(1)Zoom Telephonics, Inc.                                               500,000            4,938
o Internet.com Corp.                                                    250,000            4,750
  Cerprobe Corp.                                                        300,000            4,725
  Register.com, Inc.                                                     91,850            4,684
  NetSpeak Corp.                                                        290,000            4,676
  Maxwell Technologies, Inc.                                            300,000            4,538
o Hutchinson Technology, Inc.                                           350,000            4,463
o National Instruments Corp.                                             71,725            3,497
  Diversinet Corp.                                                      400,000            3,425
  Keithley Instruments Inc.                                              59,700            3,328
o CSG Systems International, Inc.                                        71,600            3,303
o KEMET Corp.                                                            44,200            3,293
o Aspect Development, Inc.                                               46,400            3,207
  Caminus Corp.                                                         206,400            3,083
o American Management
   Systems, Inc.                                                         82,500            3,053
o CommScope, Inc.                                                        60,600            2,879
  Moldflow Corp.                                                        152,500            2,821
  BSQUARE Corp.                                                         161,000            2,818
  Digitas Inc.                                                          182,100            2,811
o General Semiconductor, Inc.                                           138,300            2,766
o International Rectifier Corp.                                          52,500            2,579
  Reynolds & Reynolds Class A                                            99,700            2,368
  Allaire Corp.                                                          41,800            2,302
  Aeroflex, Inc.                                                         61,700            2,298
  OTG Software, Inc.                                                    102,000            2,244
o Xircom, Inc.                                                           55,800            2,201
o Anixter International Inc.                                             64,800            2,183
o Ciber, Inc.                                                           119,600            2,160
  MicroStrategy Inc.                                                     83,000            2,148
  Computer Associates
   International, Inc.                                                   38,184            2,131
  Natural Microsystems Corp.                                             32,000            2,084
o BroadVision, Inc.                                                      46,600            2,047
  In Focus Systems, Inc.                                                 67,900            2,033
o Advanced Digital
   Information Corp.                                                     82,500            2,026
o SPSS, Inc.                                                             68,900            1,964
  Park Electrochemical Corp.                                             73,700            1,889
  C-bridge Internet Solutions, Inc.                                      70,200            1,860
o Progress Software Corp.                                                92,500            1,850
o FileNet Corp.                                                          62,900            1,848
o SanDisk Corp.                                                          19,300            1,768
  Elantec Semiconductor, Inc.                                            43,200            1,750
o Kronos, Inc.                                                           53,900            1,732
  Optimal Robotics Corp.                                                 40,000            1,700
  Cognizant Technology
   Solutions Corp.                                                       36,400            1,670
  Zomax Inc.                                                             33,800            1,599
o Cypress Semiconductor Corp.                                            29,100            1,511
o Symantec Corp.                                                         23,000            1,436
o Actuate Software Corp.                                                 47,200            1,413
  CAIS Internet, Inc.                                                   102,000            1,352
o ISS Group, Inc.                                                        14,000            1,266
  LCC International, Inc. Class A                                        50,300            1,229
o Cree, Inc.                                                              8,100            1,179
  Planar Systems, Inc.                                                   98,600            1,103
  Harmonic, Inc.                                                         14,400            1,063
  Cyberoptics Corp.                                                      27,700            1,060
  Indus International, Inc.                                             173,500            1,041
o CompuCom Systems, Inc.                                                292,300            1,005
  TranSwitch Corp.                                                       11,200              986
  RSA Security Inc.                                                      15,700              921
o Technology Solutions Co.                                              136,750              897
  Netopia, Inc.                                                          21,300              889
o(3)P-Com, Inc.                                                          87,565              852
o Tech-Sym Corp.                                                         39,000              829
o Emulex Corp.                                                           18,200              826
  NVIDIA Corp.                                                            9,000              802
o Open Market, Inc.                                                      74,700              770
  Akamai Technologies, Inc.                                               7,446              736
  Intraware, Inc.                                                        44,300              709
o C-Cube Microsystems, Inc.                                              10,800              694
  The Titan Corp.                                                        16,100              691
o Zebra Technologies Corp.
   Class A                                                               11,600              661
  CACI International, Inc.                                               27,400              642
o Sawtek Inc.                                                            12,600              602
o MRV Communications Inc.                                                 8,700              600
  CTS Corp.                                                               9,300              586
o Amkor Technology, Inc.                                                  9,500              581
  Entrust Technologies, Inc.                                             11,500              565
  PerkinElmer, Inc.                                                      10,100              553
  Mercury Computer Systems, Inc.                                         14,100              542
o Black Box Corp.                                                         7,000              539
  National Computer Systems, Inc.                                        10,100              520
  Alpha Industries, Inc.                                                  9,600              499
o Integrated Device
   Technology Inc.                                                        9,900              476
o Pinnacle Systems, Inc.                                                 19,200              461
  Go2Net, Inc.                                                            7,200              428
  IPC Communications, Inc.                                                2,500              418
  Gerber Scientific, Inc.                                                29,000              402
o Harbinger Corp.                                                        19,700              372
o Amphenol Corp.                                                          5,800              370
o Lattice Semiconductor Corp.                                             5,200              350
o Adtran, Inc.                                                            5,000              338
  ZixIt Corp.                                                             8,800              325
o Micrel, Inc.                                                            3,600              311
  Ancor Communications, Inc.                                             10,200              308
o HNC Software, Inc.                                                      6,200              307

</TABLE>
                                                                              19

<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
                                                                                          MARKET
                                                                                          VALUE*
EXPLORER FUND                                                            SHARES            (000)
---------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>
o Network Peripherals, Inc.                                              10,900        $     305
  Carrier Access Corp.                                                    6,900              301
o Power Integrations, Inc.                                               13,100              298
o MTI Technology Corp.                                                   19,000              295
o Littelfuse, Inc.                                                        7,900              280
o Metro Information Services, Inc.                                       20,300              277
  Phoenix Technologies Ltd.                                              13,800              271
o Brio Technology, Inc.                                                  10,800              267
  Aspect Communications Corp.                                             7,300              259
o Cybex Computer Products Corp.                                           9,400              257
o Project Software &
   Development, Inc.                                                      8,300              253
o Siliconix, Inc.                                                         3,000              249
  RadiSys Corp.                                                           5,900              244
o Great Plains Software, Inc.                                             5,700              241
o Radiant Systems, Inc.                                                  12,600              235
o Ingram Micro, Inc. Class A                                             11,000              217
o Proxim, Inc.                                                            2,800              215
o Concord Communications, Inc.                                            7,600              213
o Plexus Corp.                                                            2,600              199
o Peregrine Systems, Inc.                                                 8,100              195
o 3Dfx Interactive, Inc.                                                 17,700              184
o ESS Technology, Inc.                                                   14,000              182
o Auspex Systems, Inc.                                                   23,700              181
o Flextronics International Ltd.                                          2,415              170
o Sanchez Computer
   Associates, Inc.                                                       8,700              169
  Pomeroy Computer
   Resources, Inc.                                                        9,600              158
o Visual Networks, Inc.                                                   3,600              140
o AXENT Technologies, Inc.                                                5,800              117
o About.com, Inc.                                                         2,900              100
o Objective Systems Integrators, Inc.                                     6,000               86
  Dallas Semiconductor Corp.                                              2,000               86
  Brooktrout Technology, Inc.                                             3,000               81
  Santa Cruz Operation, Inc.                                             12,600               76
o Inprise Corp.                                                          11,500               60
o Renaissance Worldwide, Inc.                                            15,500               58
  Miami Computer Supply Corp.                                             2,700               56
o QAD Inc.                                                                1,800               11
                                                                                        -----------
                                                                                          867,863
                                                                                        -----------
UTILITIES (1.4%)
  Viatel, Inc.                                                          235,000            8,989
o MGC Communications, Inc.                                              115,200            5,645
o Intermedia Communications Inc.                                        138,000            5,624
  Illuminet Holdings, Inc.                                              110,560            4,982
  Mediacom Communications
    Corp.                                                               392,300            4,855
  Focal Communications Corp.                                            131,455            4,379
  Netro Corp.                                                            84,400            3,640
o Commonwealth Telephone
   Enterprises, Inc.                                                     52,740            2,561
  Price Communications Corp.                                            120,500            2,440
o ITC DeltaCom, Inc.                                                     64,400            2,117
o El Paso Electric Co.                                                  180,700            1,999
o Boston Communications
   Group, Inc.                                                          184,900            1,687
  Adelphia Business Solutions, Inc.                                      34,700            1,215
  UniSource Energy Corp.                                                 61,000              991
o Western Wireless Corp. Class A                                         18,400              914
  RGS Energy Group Inc.                                                  38,400              902
  TALK.com, Inc.                                                         87,200              850
o Powertel Inc.                                                           8,600              578
  NUI Corp.                                                              21,300              570
o Aerial Communications Inc.                                             12,000              530
  CapRock Communications Corp.                                           13,600              456
o CTC Communications Group, Inc.                                          5,800              196
  Motient Corp.                                                          15,300              191
  WebLink Wireless, Inc.                                                 16,700              190
  Metricom                                                                6,000              168
o Paging Network, Inc.                                                   66,400              112
o Pacific Gateway Exchange, Inc.                                          9,500               60
                                                                                        -----------
                                                                                           56,841
                                                                                        -----------






OTHER (0.4%)
o Thermo Electron Corp.                                                 600,000           11,625
  U.S. Industries, Inc.                                                 279,600            3,408
  Teleflex Inc.                                                          47,400            1,638
  Gentek, Inc.                                                            4,500               60
                                                                                        -----------
                                                                                           16,731
                                                                                        -----------
---------------------------------------------------------------------------------------------------
TOTAL COMMON STOCKS
  (Cost $3,115,268)                                                                     3,638,396
---------------------------------------------------------------------------------------------------
                                                                            FACE
                                                                          AMOUNT
                                                                           (000)
---------------------------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENTS (10.8%)+
---------------------------------------------------------------------------------------------------
FEDERAL HOME LOAN BANK
(2)6.14%, 8/9/2000                                                   $    1,000              983
FEDERAL HOME LOAN MORTGAGE CORP.
(2)5.86%, 5/11/2000                                                       3,000            2,995
(2)5.93%, 5/4/2000                                                        3,000            2,999
FEDERAL NATIONAL MORTGAGE ASSN.
(2)6.15%, 7/13/2000                                                       7,500            7,409
U.S. TREASURY BILL
(2)5.57%, 6/29/2000                                                         100               99
REPURCHASE AGREEMENTS
Collateralized by U.S. Government
  Obligations in a Pooled
  Cash Account
  5.75%, 5/1/2000                                                       409,400          409,400
  5.79%, 5/1/2000--Note G                                                16,969           16,969
---------------------------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
  (COST $440,853)                                                                        440,854
---------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (100.1%)
  (COST $3,556,121)                                                                    4,079,250
---------------------------------------------------------------------------------------------------
</TABLE>

20

<PAGE>

-----------------------------------------------------------------
                                                          MARKET
                                                          VALUE*
                                                           (000)
-----------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-0.1%)
-----------------------------------------------------------------
Other Assets--Note C                                      49,976
Liabilities--Note G                                      (55,022)
                                                        ---------
                                                          (5,046)
-----------------------------------------------------------------
NET ASSETS (100%)
-----------------------------------------------------------------
Applicable to 54,604,734 outstanding
  $.001 par value shares of
  beneficial interest
  (unlimited authorization)                           $4,074,204
=================================================================

NET ASSET VALUE PER SHARE                                 $74.61
=================================================================

 *See Note A in Notes to Financial Statements.
 oNon-Income-Producing Security.
 +The fund invests a portion of its cash reserves in equity markets through the
  use of index futures  contracts.  After giving effect to futures  investments,
  the fund's  effective  common stock and temporary  cash  investment  positions
  represent 94.9% and 5.2%, respectively,  of net assets. See Note F in Notes to
  Financial Statements.
 (1)Considered  an  affiliated  company  as the fund  owns  more  than 5% of the
  outstanding  voting  securities  of such  company.  The total  market value of
  investments in affiliated companies was $128,483,000.
 (2)Securities with an aggregate value of $14,485,000  have been  segregated  as
  initial margin for open futures contracts.
 (3)Restricted security.
 ADR--American Depositary Receipt.
 REIT--Real Estate Investment Trust.


--------------------------------------------------------------------------
                                                 AMOUNT               PER
                                                  (000)             SHARE
--------------------------------------------------------------------------
 AT APRIL 30, 2000, NET ASSETS CONSISTED OF:
--------------------------------------------------------------------------
 Paid in Capital                             $2,764,894            $50.63
 Undistributed Net
  Investment Income                               2,466               .05
 Accumulated Net Realized Gains                 789,833             14.46
 Unrealized Appreciation
  (Depreciation)--Note F
  Investment Securities                         523,129              9.58
  Futures Contracts                             (6,118)             (.11)
--------------------------------------------------------------------------
Net Assets                                   $4,074,204            $74.61
==========================================================================
                                                                              21

<PAGE>


STATEMENT OF OPERATIONS
This Statement  shows dividend and interest income earned by the 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  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 the
fund  invested  in futures  contracts  during the  period,  the results of these
investments are shown separately.

--------------------------------------------------------------------------------
                                                                  EXPLORER FUND
                                                SIX MONTHS ENDED APRIL 30, 2000
                                                                          (000)
--------------------------------------------------------------------------------
INVESTMENT INCOME
INCOME
   Dividends*                                                        $    6,773
   Interest                                                              10,481
   Security Lending                                                         266
                                                                     -----------
      Total Income                                                       17,520
                                                                     -----------
EXPENSES
   Investment Advisory Fees--Note B
      Basic Fee                                                           3,371
      Performance Adjustment                                                900
   The Vanguard Group--Note C
      Management and Administrative                                       7,506
      Marketing and Distribution                                            194
   Custodian Fees                                                            91
   Auditing Fees                                                              5
   Shareholders' Reports                                                     43
   Trustees' Fees and Expenses                                                2
                                                                     -----------
      Total Expenses                                                     12,112
      Expenses Paid Indirectly--Note D                                      (77)
                                                                     -----------
      Net Expenses                                                       12,035
--------------------------------------------------------------------------------
NET INVESTMENT INCOME                                                     5,485
--------------------------------------------------------------------------------
REALIZED NET GAIN
   Investment Securities Sold*                                          758,977
   Futures Contracts                                                     29,557
--------------------------------------------------------------------------------
REALIZED NET GAIN                                                       788,534
--------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)
   Investment Securities                                                114,583
   Futures Contracts                                                     (4,307)
--------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)                        110,276
--------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                   $904,295
================================================================================
*Dividend  income and realized net loss from  affiliated  companies were
$16,000 and $(4,296,000), respectively.

22

<PAGE>

STATEMENT OF CHANGES IN NET ASSETS

This Statement shows how the fund's total net assets changed during the two most
recent reporting periods. The Operations section summarizes information detailed
in  the  Statement  of  Operations.   The  amounts  shown  as  Distributions  to
shareholders  from the fund's net  income  and  capital  gains may not match the
amounts 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
income was earned or 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,  as well as
the amounts redeemed.  The  corresponding  numbers of Shares Issued and Redeemed
are shown at the end of the Statement.

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------
                                                                          EXPLORER FUND
                                                            -----------------------------------
                                                                SIX MONTHS                 YEAR
                                                                     ENDED                ENDED
                                                             APR. 30, 2000        OCT. 31, 1999
                                                                     (000)                (000)
-----------------------------------------------------------------------------------------------
<S>                                                                  <C>                   <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
   Net Investment Income                                         $   5,485            $  8,535
   Realized Net Gain                                               788,534             334,544
   Change in Unrealized Appreciation (Depreciation)                110,276             177,769
                                                               --------------------------------
      Net Increase in Net Assets Resulting from Operations         904,295             520,848
                                                               --------------------------------
DISTRIBUTIONS
   Net Investment Income                                            (9,305)             (8,697)
   Realized Capital Gain                                          (324,836)            (13,054)
                                                               --------------------------------
      Total Distributions                                         (334,141)            (21,751)
                                                               --------------------------------
CAPITAL SHARE TRANSACTIONS1
   Issued                                                        1,458,561             581,427
   Issued in Lieu of Cash Distributions                            329,592              21,406
   Redeemed                                                       (768,264)           (813,686)
                                                               --------------------------------
      Net Increase (Decrease) from Capital Share Transactions    1,019,889            (210,853)
-----------------------------------------------------------------------------------------------
   Total Increase                                                1,590,043             288,244
-----------------------------------------------------------------------------------------------
NET ASSETS
   Beginning of Period                                           2,484,161           2,195,917
                                                               --------------------------------
   End of Period                                                $4,074,204          $2,484,161
===============================================================================================

1Shares Issued (Redeemed)
   Issued                                                           19,344              10,222
   Issued in Lieu of Cash Distributions                              5,360                 403
   Redeemed                                                        (10,499)            (14,495)
                                                               --------------------------------
      Net Increase (Decrease) in Shares Outstanding                 14,205              (3,870)
===============================================================================================
</TABLE>
                                                                              23
<PAGE>


FINANCIAL HIGHLIGHTS
This table  summarizes  the  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.

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
                                                                                       EXPLORER FUND
                                                                                  YEAR ENDED OCTOBER 31,
FOR A SHARE OUTSTANDING                        SIX MONTHS ENDED        -----------------------------------------------
THROUGHOUT EACH PERIOD                           APRIL 30, 2000        1999      1998       1997      1996       1995
----------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>      <C>          <C>        <C>        <C>       <C>

NET ASSET VALUE, BEGINNING OF PERIOD                     $61.49      $49.60    $62.31     $55.44     $51.05    $45.99
----------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
   Net Investment Income                                    .12         .21       .21        .26       .26        .24
   Net Realized and Unrealized Gain
     (Loss) on Investments                                21.26       12.18     (6.82)      9.71      8.37       7.25
                                                       ---------------------------------------------------------------
   Total from Investment Operations                       21.38       12.39     (6.61)      9.97      8.63       7.49
                                                       ---------------------------------------------------------------
DISTRIBUTIONS
   Dividends from Net Investment Income                    (.23)       (.20)     (.25)      (.27)     (.24)      (.17)
   Distributions from Realized Capital Gains              (8.03)       (.30)    (5.85)     (2.83)    (4.00)     (2.26)
                                                       ---------------------------------------------------------------
   Total Distributions                                    (8.26)       (.50)    (6.10)     (3.10)    (4.24)     (2.43)
----------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                           $74.61      $61.49    $49.60     $62.31    $55.44     $51.05
======================================================================================================================
TOTAL RETURN                                             37.64%      25.14%   -11.22%     18.93%    17.97%     17.46%
======================================================================================================================

RATIOS/SUPPLEMENTAL DATA
   Net Assets, End of Period (Millions)                  $4,074      $2,484    $2,196     $2,550    $2,186     $1,476
   Ratio of Total Expenses to
      Average Net Assets                                 0.71%*       0.74%     0.62%      0.62%     0.63%      0.68%
   Ratio of Net Investment Income to
      Average Net Assets                                 0.32%*       0.36%     0.37%      0.45%     0.51%      0.52%
   Portfolio Turnover Rate                                144%*         79%       72%        84%       51%        66%
======================================================================================================================
*Annualized.
</TABLE>
24
<PAGE>


NOTES TO FINANCIAL STATEMENTS
Vanguard Explorer Fund 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 fund  consistently  follows such
policies in preparing its financial statements.

     1. SECURITY  VALUATION:  Equity  securities are valued at the latest quoted
sales  prices  as of the  close  of  trading  on the  New  York  Stock  Exchange
(generally  4:00 p.m.  Eastern time) on the valuation  date; such securities not
traded on the valuation date are valued at the mean of the latest quoted bid and
asked  prices.  Prices are taken from the primary  market in which each security
trades.  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:  THe fund  intends to  continue to qualify as a
regulated   investment  company  and  distribute  all  of  its  taxable  income.
Accordingly,  no provision for federal income taxes is required in the financial
statements.

     3.  REPURCHASE  AGREEMENTS:  The fund,  along  with  other  members  of The
Vanguard  Group,  transfers  uninvested  cash balances to 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:  The fund uses S&P MidCap 400 and Russell 2000 Index
futures  contracts to a limited extent,  with the objectives of maintaining full
exposure to the stock market while maintaining liquidity.  The fund may purchase
or sell futures  contracts to achieve a desired level of investment,  whether to
accommodate  portfolio turnover or cash flows from capital shares  transactions.
The primary  risks  associated  with the use of futures  contracts are imperfect
correlation  between changes in market values of stocks held by the fund and the
prices of futures contracts, and the possibility of an illiquid market.

     Futures contracts are valued at 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  to  shareholders  are  recorded  on  the
ex-dividend  date.  Distributions  are  determined on a tax basis and may differ
from net investment  income and realized  capital gains for financial  reporting
purposes.

     6. OTHER:  Dividend  income is recorded on the ex-dividend  date.  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.

B. Granahan Investment  Management,  Inc.,  Wellington  Management Company, LLP,
Chartwell  Investment  Partners,  and as of April 3, 2000,  Grantham,  Mayo, Van
Otterloo & Co. llc  provide  investment  advisory  services to the fund for fees
calculated at an annual percentage rate of average net assets. The basic fees of
Granahan  and  Wellington  are  subject  to  quarterly   adjustments   based  on
performance for the preceding three years relative to the Russell 2000 Index and
the Small  Company  Growth  Fund Stock Index (an index of the stocks held by the
largest  small-capitalization stock

                                                                              25
<PAGE>

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

mutual  funds).  The basic fee of Chartwell is subject to quarterly  adjustments
based on performance  relative to the Small Company Growth Fund Stock Index. For
the six months  ended April 30,  2000,  the  aggregate  investment  advisory fee
represented  an effective  annual basic rate of 0.20% of the fund's  average net
assets before an increase of $900,000 (0.05%) based on performance.

     The Vanguard Group provides  investment  advisory  services to a portion of
the fund on an at-cost  basis;  the fund paid Vanguard  advisory fees of $79,000
for the six months ended April 30, 2000.

C. The Vanguard Group  furnishes at cost corporate  management,  administrative,
marketing,and distribution services. The costs of such services are allocated to
the fund under methods approved by the board of Trustees. The fund has committed
to provide up to 0.40% of its net assets in capital  contributions  to Vanguard.
At April 30,  2000,  the fund had  contributed  capital of  $808,000 to Vanguard
(included in Other Assets), representing 0.02% of the fund's net assets and 0.8%
of  Vanguard's  capitalization.  The  fund's  Trustees  and  officers  are  also
directors and officers of Vanguard.

D. The fund has asked its investment advisers to direct certain security trades,
subject to obtaining the best price and execution, to brokers who have agreed to
rebate to the fund part of the  commissions  generated.  Such  rebates  are used
solely to reduce the fund's management and administrative  expenses.  The fund's
custodian  bank has also agreed to reduce its fees when the fund  maintains cash
on deposit in the non-interest-bearing custody account. For the six months ended
April 30, 2000, directed brokerage and custodian fee offset arrangements reduced
expenses by $57,000 and $20,000, respectively.

E. During the six months ended April 30, 2000, the fund purchased $2,716,059,000
of investment securities and sold $2,198,957,000 of investment securities, other
than temporary cash investments.

F. At April 30, 2000, net unrealized  appreciation of investment  securities for
financial reporting and federal income tax purposes was $523,129,000, consisting
of unrealized  gains of $831,249,000 on securities that had risen in value since
their  purchase and  $308,120,000  in unrealized  losses on securities  that had
fallen in value since their purchase.

     At April 30, 2000, the aggregate settlement value of open futures contracts
expiring in June 2000, and the related  unrealized  appreciation  (depreciation)
were:

--------------------------------------------------------------------------------
                                                           (000)
                                                --------------------------------
                                                 AGGREGATE        UNREALIZED
                                NUMBER OF       SETTLEMENT       APPRECIATION
    FUTURES CONTRACTS        LONG CONTRACTS        VALUE        (DEPRECIATION)
--------------------------------------------------------------------------------
    S&P MidCap 400 Index          307          $  74,102          $    16
    Russell 2000 Index            612            155,754           (6,134)
--------------------------------------------------------------------------------

G. The market value of securities on loan to  broker/dealers  at April 30, 2000,
was  $16,294,000,  for which the fund held cash collateral of $16,969,000.  Cash
collateral received is invested in repurchase agreements.

26
<PAGE>

THE VANGUARD(R)FAMILY OF FUNDS

STOCK FUNDS
---------------------------------------
500 Index Fund
Aggressive Growth Fund
Capital Opportunity Fund
Convertible Securities Fund
Emerging Markets Stock
  Index Fund
Energy Fund
Equity Income Fund
European Stock Index Fund
Explorer(TM) Fund
Extended Market Index Fund*
Global Equity Fund
Gold and Precious Metals Fund
Growth and Income Fund
Growth Index Fund*
Health Care Fund
Institutional Index Fund*
International Growth Fund
International  Value Fund
Mid-Cap Index Fund*
Morgan(TM) Growth Fund
Pacific  Stock  Index Fund
PRIMECAP Fund
REIT Index Fund
Selected Value Fund
Small-Cap Growth Index Fund*
Small-Cap Index Fund*
Small-Cap Value Index Fund*
Tax-Managed Capital Appreciation Fund*
Tax-Managed Growth and Income Fund*
Tax-Managed International Fund*
Tax-Managed Small-Cap Fund*
Total International Stock
  Index Fund
Total Stock Market Index Fund*
U.S. Growth Fund
Utilities Income Fund
Value Index Fund*
Windsor(TM) Fund
Windsor(TM) II Fund


BALANCED FUNDS
---------------------------------------
Asset Allocation Fund
Balanced Index Fund
Global Asset Allocation Fund
LifeStrategy(R) Conservative
  Growth Fund
LifeStrategy(R) Growth Fund
LifeStrategy(R) Income Fund
LifeStrategy(R) Moderate
  Growth Fund
STAR(TM) Fund
Tax-Managed Balanced Fund
Wellesley(R) Income Fund
Wellington(TM) Fund


BOND FUNDS
---------------------------------------
Admiral(TM) Intermediate-Term
  Treasury Fund
Admiral(TM)Long-Term Treasury Fund
Admiral(TM)Short-Term Treasury Fund
GNMA Fund
High-Yield Corporate Fund
High-Yield Tax-Exempt Fund
Insured Long-Term Tax-Exempt Fund
Intermediate-Term Bond Index Fund
Intermediate-Term Corporate Fund
Intermediate-Term Tax-Exempt Fund
Intermediate-Term Treasury Fund
Limited-Term Tax-Exempt Fund
Long-Term Bond Index Fund
Long-Term Corporate Fund
Long-Term Tax-Exempt Fund
Long-Term Treasury Fund
Preferred Stock Fund
Short-Term Bond Index Fund
Short-Term Corporate Fund*
Short-Term Federal Fund
Short-Term Tax-Exempt Fund
Short-Term Treasury Fund
State Tax-Exempt Bond Funds
  (California, Florida,
  Massachusetts, New Jersey,
  New York, Ohio, Pennsylvania)
Total Bond Market Index Fund*


MONEY MARKET FUNDS
---------------------------------------
Admiral(TM) Treasury Money
  Market Fund
Federal Money Market Fund
Prime Money Market Fund*
State Tax-Exempt Money Market Funds
  (California, New Jersey, New York
  Ohio, Pennsylvania)
Tax-Exempt Money Market Fund
Treasury Money Market Fund


VARIABLE  ANNUITY PLAN
---------------------------------------
Balanced  Portfolio
Diversified  Value Portfolio
Equity Income Portfolio
Equity  Index  Portfolio
 Growth  Portfolio
High-Grade Bond Portfolio
High Yield Bond Portfolio
International Portfolio
Mid-Cap Index Portfolio
Money Market Portfolio
REIT Index Portfolio
Short-Term Corporate Portfolio
Small Company Growth Portfolio

*Offers Institutional Shares.

For information  about Vanguard funds and our variable  annuity plan,  including
charges and  expenses,  obtain a prospectus  from The Vanguard  Group,  P.O. Box
2600,  Valley Forge, PA 19482-2600.
Read it carefully before you invest or send money.

27

<PAGE>

--------------------------------------------------------------------------------
THE PEOPLE WHO GOVERN YOUR FUND

The  Trustees of your mutual fund are there to see that the fund is operated and
managed in your best interests  since,  as a shareholder,  you are part owner of
the fund.  Your  fund  Trustees  also  serve on the  Board of  Directors  of The
Vanguard  Group,  which is owned by the  funds  and  exists  solely  to  provide
services to them on an at-cost basis.

   Seven of Vanguard's  eight board members are  independent,  meaning that they
have no  affiliation  with  Vanguard or the funds they  oversee,  apart from the
sizable personal investments they have made as private  individuals.  They bring
distinguished  backgrounds  in business,  academia,  and public service to their
task of working with Vanguard officers to establish the policies and oversee the
activities of the funds.

   Among board members'  responsibilities  are selecting investment advisers for
the  funds;  monitoring  fund  operations,  performance,  and  costs;  reviewing
contracts;  nominating  and  selecting  new  Trustees/Directors;   and  electing
Vanguard officers.

         The  list  below  provides  a  brief   description  of  each  Trustee's
professional affiliations. Noted in parentheses is the year in which the Trustee
joined the Vanguard Board.


TRUSTEES

JOHN J. BRENNAN  (1987)  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 (1998) 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  (1990)  President  Emeritus  of The  Brookings  Institution;
Director of  American  Express  Bank Ltd.,  The St. Paul  Companies,  Inc.,  and
National Steel Corp.

BURTON G. MALKIEL  (1977)  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. (1993) Chairman,  President,  Chief Executive Officer, and
Director of NACCO Industries, Inc.; Director of The BFGoodrich Co.

JOHN C.  SAWHILL  (1991)  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. (1971) 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  (1985)  Retired  Chairman of Rohm & Haas Co.;  Director of
AmeriSource Health Corporation,  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.


VANGUARD MANAGING DIRECTORS

R. GREGORY BARTON  Legal Department.
ROBERT A. DISTEFANO  Information Technology.
JAMES H. GATELY  Individual Investor Group.
KATHLEEN C. GUBANICH  Human Resources.
IAN A. MACKINNON  Fixed Income Group.
F. WILLIAM MCNABB, III  Institutional Investor Group.
MICHAEL S. MILLER  Planning and Development.
RALPH K. PACKARD  Chief Financial Officer.
GEORGE U. SAUTER  Quantitative Equity Group.

<PAGE>


[SHIP GRAPHIC]
[THE VANGUARD GROUP LOGO]

Post Office Box 2600
Valley Forge, Pennsylvania 19482-2600

ABOUT OUR COVER
Our cover art,  depicting HMS Vanguard at sea, is a reproduction  of Leading the
Way, a 1984 work created and  copyrighted by noted naval artist Tom Freeman,  of
Forest Hill, Maryland.

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 fund's  shareholders.  It may not be distributed
to  prospective  investors  unless it is preceded or  accompanied by the current
fund prospectus.

Q242-062000

(C)2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing
Corporation, Distributor.



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