VANGUARD CONVERTIBLE SECURITIES FUND INC
N-30D, 2000-08-02
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<PAGE>

VANGUARD[R] CONVERTIBLE SECURITIES FUND

[PHOTO]

SEMIANNUAL REPORT
May 31, 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  counterpro-ductive  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 adiversified 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            FUND PROFILE                8
THE MARKETS IN PERSPECTIVE     4            PERFORMANCE SUMMARY        11
REPORT FROM THE ADVISER        6            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

[PHOTO]
JOHN J. BRENNAN

Vanguard Convertible  Securities Fund earned a strong return of 12.0% during the
first half of its fiscal  year,  surpassing  the results of its average peer and
its benchmark index.  During a very volatile period for financial  markets,  the
fund's gains well surpassed the returns of the broad stock and bond markets.

     The table at right  presents the fund's total return  (capital  change plus
reinvested  dividends)  for the six months ended May 31, along with those of the
average  competing  fund and our  unmanaged  benchmark,  the Credit Suisse First
Boston Convertible Securities Index. We also present the returns of the Wilshire
5000 Total Market Index, which is a proxy for the overall U.S. stock market, and
the Lehman  Brothers  Aggregate Bond Index, a benchmark for the overall  taxable
bond market.

------------------------------------------------------------
                                       TOTAL RETURNS
                                     SIX MONTHS ENDED
                                       MAY 31, 2000
------------------------------------------------------------
Vanguard Convertible Securities Fund         12.0%
------------------------------------------------------------
Average Convertible Securities Fund*         10.7%
------------------------------------------------------------
CS First Boston Convertibles Index           10.4%
------------------------------------------------------------
Wilshire 5000 Total Market Index             2.4%
Lehman Aggregate Bond Index                  1.4
------------------------------------------------------------
*Derived from data provided by Lipper Inc.

     Our total return is based on an increase in net asset value from $13.18 per
share on November 30, 1999, to $13.77 per share on May 31, 2000, and is adjusted
for dividends  totaling  $0.25 per share paid from net  investment  income and a
distribution of $0.70 per share paid from net realized capital gains. The fund's
annualized  dividend  yield was 3.99% on May 31, up from  3.16%  when the period
began.

THE PERIOD IN REVIEW

The U.S. economy  continued a remarkably strong advance during the first half of
our fiscal year. The economy's total output during the first quarter of calendar
2000 was 5.0% higher--after  adjusting for  inflation--than in the first quarter
of 1999. And May marked the 110th month of uninterrupted  expansion for the U.S.
economy--the longest period ever without a recession.

     A growing economy  generally means good news for corporate  profits and for
stocks.  However, during the past six months, many investors were concerned that
the economy might be too robust and that its rapid growth,  combined with a very
low  unemployment  rate (around 4% of the  workforce),  could light a fire under
inflation.  To siphon some steam from the  economy,  the Federal  Reserve  Board
raised its target for  short-term  interest  rates  three times for a total of 1
percentage point from February 2 through May 16.

     The overall stock market, as measured by the Wilshire 5000 Index, rose 2.4%
during the six months.  However,  there were  frequent  and wide swings in stock
prices, especially among small-capitalization  stocks and for technology issues,
whose valuations had reached very high levels. The small-cap Russell 2000 Growth
Index,  which is heavily  weighted in technology  stocks,  saw a 43.6% gain from
November 30 through  February 29,  followed by a -26.6% decline from February 29
through May 31, resulting in a 5.4% return for the half-year.

                                       1
<PAGE>

     When the dust cleared, nearly all the major stock indexes registered gains.
However,  in contrast to recent years,  value stocks showed some strength.  They
slightly  outpaced  growth  stocks in both the S&P 500 and Russell  2000 Indexes
over the six months ended May 31.

     For fixed income  investors,  the Fed's efforts to boost interest rates had
mixed  results.  In  response  to the Fed's  1-percentage-point  increase in its
target federal funds rate,  the yield on 3-month U.S.  Treasury bills climbed as
much as 91 basis points (0.91 percentage point), to 6.21% as of May 16. However,
in the  final two weeks of the  period,  rates  fell.  Apparently,  many  market
participants thought that the Fed's half-point increase in rates on May 16 might
suffice to slow the economy enough to preempt inflation.  By May 31, the 3-month
T-bill yield was 5.62%,  representing  an increase of 32 basis points during the
half-year.

     Prices  of  longer-term  Treasury  securities  benefited  from a  shrinking
supply,  as the growing federal budget surplus  resulted in reduced  issuance of
new bonds and the repurchase of some outstanding bonds. The yield of the 30-year
Treasury bond fell 28 basis points,  on balance,  ending the half-year at 6.01%.
The yield of the 10-year Treasury note rose 8 basis points, to 6.27%.  Prices of
most  corporate  bonds declined  during the  half-year.  The 1.4% return for the
Lehman  Aggregate Bond Index  consisted of an average price decline of about 2%,
offset by a six-month income return of 3.4%.

PERFORMANCE OVERVIEW

Vanguard  Convertible  Securities Fund's 12.0% return for the half-year was very
satisfactory,  exceeding the returns of all of our benchmarks. This performance,
however,  did not mean that the fund,  or  convertible  securities  in  general,
escaped the price gyrations seen in many market sectors.

     Our fund gained 23.2% during the first three months of the half-year,  then
fell -9.1% from March through May. Our average peer saw similar  fluctuations to
a somewhat  lesser  degree  with  returns of 20.5% and -7.6% for the  respective
periods. CS First Boston Convertibles Index diverged more (+25.4% and -11.9%).

     Our holdings in the technology, telecommunications, and health care sectors
helped our performance  during the first half of the reporting  period.  Because
our fund typically sells  securities that have risen to extreme  valuations,  we
escaped  some  of  the  impact  of  sharp   declines   experienced   by  certain
technology-related  convertibles  during the  March-May  quarter.  Some of these
securities  had  significant  weightings  within  the index,  so their  declines
disproportionately hurt this benchmark during the second fiscal quarter.

     For more details on the convertible  securities market, see the Report From
The Adviser on page 6.

IN SUMMARY

The  volatility  of the  stock  and bond  markets  during  the  past six  months
certainly  illustrated  the beneficial role  convertible  securities can play in
some portfolios.  As stock-bond hybrids,  convertibles  typically provide higher
income than common  stocks and higher  potential for capital  appreciation  than
bonds.  They also can  provide a degree of  protection  against  steep  drops in
common stocks.

     Because there are no  guarantees  that any asset class will perform well in
any given  period,  we advocate a  diversified  portfolio of stock  funds,  bond
funds, and money market funds. The mix of such funds should fit your goals, time
horizon,  and risk  tolerance.

                                       2
<PAGE>

Sticking with such a plan for the long haul can help  investors  ride out market
turbulence on course to their long-term goals.


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


June 29, 2000


--------------------------------------------------------------------------------
NOTICE TO SHAREHOLDERS

In the past, the quarterly income dividend that Vanguard Convertible  Securities
Fund  distributed to shareholders was paid at a set rate of $0.12 per share. Any
income the fund earned in excess of the set rate was distributed in the December
income dividend. Beginning with the dividend of $0.11 per share that was paid in
March 2000, the fund is distributing  income on a "pay as you go" basis,  rather
than  according  to a set rate.  This  policy  change  provides  for a more even
distribution of income throughout the year.
--------------------------------------------------------------------------------



--------------------------------------------------------------------------------
IN MEMORY
It is with  great  sadness  that I  report  the  death  of John C.  Sawhill,  an
independent  trustee of the fund and a member of The Vanguard  Group's  board of
directors  since 1991.  John, an economist who was president and chief executive
officer  of The  Nature  Conservancy,  died on May 18 at age 63. He was a senior
lecturer at the Harvard  Business School and had formerly served as president of
New York  University  and as deputy  secretary of the U.S.  Department of Energy
under President Jimmy Carter.  John was a remarkable man who was full of energy,
vigor,  and life. His experience and wisdom added a great deal to Vanguard,  and
his death is a blow to everyone  who knew and loved him.  Though  John's work on
behalf of our funds was often  carried on behind the scenes,  he was a dedicated
advocate for the best interests of our shareholders. He will be missed.
--------------------------------------------------------------------------------

                                       3
<PAGE>

THE MARKETS IN PERSPECTIVE
SIX MONTHS ENDED MAY 31, 2000

Strong  crosscurrents  pushed and  tugged at  financial  markets  during the six
months ended May 31, 2000.  Positive  influences  included very strong  economic
growth and rising corporate profits.  Negative factors included tighter monetary
policy, higher inflation, and concerns about stock valuations.

     Interest  rates rose in most  segments of the bond market,  and bond prices
slipped. Stock prices rose slightly, on balance,  although wide day-to-day price
swings were frequent.

     Uncertainty  in both the bond and stock markets  centered on the surprising
performance of the U.S.  economy,  which grew at a torrid 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 around  4.0% of the  workforce,  the  Federal
Reserve Board  continued to be concerned that inflation  would worsen unless the
economic  expansion  slowed.  The Fed raised  short-term  interest rates by 0.25
percentage  point in February and again in March,  before boosting rates by 0.50
percentage    point    in    mid-May.    These    boosts,     following    three
quarter-percentage-point increases in 1999, took the Fed's target for short-term
rates to 6.5%.  By the end of May,  some  signs of  slowing  had  emerged in the
economy,  although it was not certain  that the Fed had  finished  applying  the
brakes.

----------------------------------------------------------------------
                                              TOTAL RETURNS
                                        PERIODS ENDED MAY 31, 2000
                                       -------------------------------
                                      6 MONTHS    1 YEAR     5 YEARS*
----------------------------------------------------------------------
STOCKS
  S&P 500 Index                        2.9%        10.5%       23.8%
  Russell 2000 Index                   5.5          9.9        13.5
  Wilshire 5000 Index                  2.4         10.7        22.3
  MSCI EAFE Index                      0.7         17.4        10.4
----------------------------------------------------------------------
BONDS
  Lehman Aggregate Bond Index          1.4%        2.1%         6.0%
  Lehman 10 Year Municipal Bond Index  0.7        -0.2          5.3
  Salomon Smith Barney 3-Month
   U.S. Treasury Bill Index            2.7         5.2          5.2
----------------------------------------------------------------------
OTHER
  Consumer Price Index                 1.8%        3.1%         2.4%
----------------------------------------------------------------------
*Annualized.


     Evidence on inflation was  ambiguous.  The Consumer  Price Index  increased
1.8% and 3.1%, respectively, for the six- and twelve-month periods ended May 31,
but  much of the  increase  was due to  higher  energy  and  food  prices.  Core
inflation,  which excludes those  sectors,  was up a less-scary  2.4% during the
twelve months ended May 31.

U.S. STOCK MARKETS

Optimism about long-term prospects for technology, media, and telecommunications
companies  dominated  the equity  markets  through the first three months of the
period.  But  sentiment  shifted  suddenly  in  mid-March,  sending the tech and
telecom  groups  sharply  lower.  The tech-heavy  Nasdaq  Composite  Index,  for
example, registered a 41.1% return from November 30 through February 29, only to
give back most of the gains  over the next  three  months.  End  result:  a 2.4%
return for the six months ended May 31.

     The overall  stock  market,  as measured by the Wilshire  5000 Index,  also
returned 2.4%.  Value stocks,  those  characterized  by  above-average  dividend
yields and below-average  price/earnings and price/book value ratios,  enjoyed a
resurgence beginning in mid-March.

                                       4
<PAGE>

For the full six months,  the value components of both the  large-capitalization
S&P 500 Index and the  small-cap  Russell 2000 Index  outperformed  the indexes'
growth components.

     Within the S&P 500, the  half-year's  best return was the 48% gain recorded
by "other energy" stocks,  including  oil-drilling  and services  companies that
benefited from a continuing  rise in oil prices.  The  producer-durables  sector
gained  18%,  largely  because  of big gains for a number  of  manufacturers  of
telecommunications  gear and  semiconductor  testing and fabrication  equipment.
Technology  stocks,  which now account for about  one-quarter of the total stock
market's value, gained about 12% for the six months.

     Poor performers included the utilities sector (-14% return), which was hurt
by downturns in several large telephone stocks,  and many consumer staples (-9%)
and consumer-discretionary  (-6%) companies. Prices fell steeply for a number of
high-profile  retailers,  beverage  and  food  makers,  tobacco  companies,  and
entertainment enterprises.

U.S. BOND MARKETS

The Federal  Reserve's  influence on interest  rates is strongest for short-term
securities. Over the six months, the Fed pushed up the rate charged on overnight
loans  between  banks by 1  percentage  point to 6.5%.  Yields of  3-month  U.S.
Treasury bills rose only one-third as far (0.32  percentage  point,  or 32 basis
points),  to 5.62%.  And long-term  Treasury yields moved even less. The 10-year
Treasury  note rose just 8 basis  points to 6.27% as of May 31, and yields  fell
for very long-term  Treasury bonds due to a cutback in issuance of new bonds. As
a result of the shrinking  supply of long-term  bonds,  the yield of the 30-year
Treasury  bond  declined  28  basis  points--from  6.29%  to  6.01%--during  the
half-year.

     Because short-term rates moved higher while long-term rates declined, there
was an unusual "inversion" in the yield curve.  Instead of sloping  upward--with
yields  increasing  along with the  maturity of Treasury  securities--the  curve
sloped down. The 6.01% yield of 30-year Treasuries on May 31 was 70 basis points
below the 6.71% yield on 3-year Treasury notes.

     Corporate  and  municipal  bonds  did  not  perform  as  well  as  Treasury
securities,  and the yield curve for these sectors remained  positive--yields of
long-term bonds remained higher than those of short-term securities.  The Lehman
Aggregate  Bond Index,  a proxy for the overall  taxable bond  market,  returned
1.4%, as a price decline of 2% offset most of the 3.4% income  provided by bonds
during the half-year.

INTERNATIONAL STOCK MARKETS

A stronger  U.S.  dollar and weak Asian  markets made the half-year a lackluster
one for U.S.  investors in foreign stocks.  Improving economic growth in most of
the world  helped a number of  markets  in Europe,  Asia,  and Latin  America to
produce good gains in their local currencies. However, the U.S. dollar increased
in value versus most currencies,  significantly reducing the returns received by
dollar-based  investors.  (Conversely,  when the dollar falls in value,  returns
from abroad are enhanced for U.S. investors.)

     The overall  return in dollars from developed  foreign  markets was a scant
0.7%,  as  measured  by  the  Morgan  Stanley  Capital   International   Europe,
Australasia, Far East (EAFE) Index. However, in local currencies, the EAFE Index
return for the six months was a very respectable 7.8%.

     In  Europe,   where  stocks  benefited  from  a  continuance  of  corporate
acquisitions,  an average 12.8% gain in local-currency terms was reduced to 4.7%
for U.S.  investors  because of the  dollar's  strength.  Stocks in the  Pacific
region,  which is  dominated  by Japan,  returned  -7.0% in dollars,  as a -2.0%
return in local-currency terms was further diminished by the dollar's gains. The
Select Emerging Markets Free Index returned -2.8% in U.S. dollars.

                                       5
<PAGE>

REPORT FROM THE ADVISER

Vanguard Convertible  Securities Fund's performance during the first half of its
2000  fiscal  year  was  reasonably  rewarding,  given  the  extremely  volatile
investing  environment.  During  the six  months  ended May 31,  the fund had an
attractive  absolute return of 12.0%,  which was moderately ahead of the returns
for both of our primary benchmarks:  the average  convertible-securities  mutual
fund (+10.7%) and the CS First Boston Convertibles Index (+10.4%).

     The  half-year  was  certainly  a  period  of  extremes--sharp   gains  for
growth-stock  indexes early in the period followed by steep losses in the latter
months.  Of course,  the markets were extremely  volatile during this time, with
significant  changes intraweek and even intraday.  In this extreme  environment,
the fund  performed  relatively  well. The downside  protection of  convertibles
held,  as expected,  protecting  our  shareholders  from the full decline in the
equity markets.

     Your  fund's  performance  during  the past six months  was  affected  by a
variety of positive factors.  The first was the fund's  significant  exposure to
the technology and  telecommunication  sectors,  where many individual  holdings
were  above-average  performers.  Second, the fund's exposure to the health care
sector  was  beneficial  because  the stocks of biotech  and  genomic  companies
generally  performed very well. Lastly, the fund benefited from a generally busy
calendar of new issues,  as a wide  variety of companies  used the  convertibles
market as a source of financing.  Many of these issues appeared cheap by various
statistical measures and experienced immediate appreciation.

     Despite the recent sharp decline in many telecommunications  securities, we
continue  to  feel  positive  about  this  sector  and  to  emphasize   wireless
communications  (including not only the service providers  themselves,  but also
companies providing infrastructure for wireless  communications).  Our positions
in this area include Nextel Communications,  EchoStar  Communications,  American
Tower,  and  Pinnacle  Holdings.  During the latter half of the six months,  our
winners came from the defensive  sectors,  including  energy,  health care,  and
financial  services  issues.  Not  surprisingly,  investment-grade  convertibles
outperformed  those of lower credit  quality when the market fell and  investors
flocked to high-rated issues.

--------------------------------------------------------------------------------
INVESTMENT PHILOSOPHY
The adviser  believes  that a reasonable  level of current  income and long-term
growth in capital can be achieved by investing in a broadly diversified group of
convertible  securities that provide  attractive  combinations of current income
and  potential  for price  appreciation  from their  convertibility  into common
stock.
--------------------------------------------------------------------------------

     We  recently  increased  our  exposure  to oil  and gas  companies,  adding
Kerr-McGee,  Anadarko Petroleum, and Pride International convertibles. The first
two are investment-grade issues.

     During the six-month  period,  the CS First Boston  Convertibles  Index was
buffeted by the same forces that affected your fund. However, the index declined
further during the market sell-off.  This is because many of the index's largest
components  are  convertibles  that behave as pure equity  substitutes  and that
accordingly felt the full force of the declines in the underlying stocks. In the
past,  when these  securities  were soaring,  we noted that they totally  lacked
downside protection; now we report that they performed poorly, as expected, when
downside protection was needed.

                                       6
<PAGE>

     As usual,  we are fully  invested  in  convertible  securities;  we hold no
common  stocks  or  other  nonconvertible  investments.  The fund  remains  well
diversified,  with approximately 23% of assets in convertible preferreds and the
balance in convertible  bonds.  Given the market's recent weakness,  our average
conversion premium has expanded. Over time, we will follow our usual practice of
rotating out of issues with extremely high  conversion  premiums and reinvesting
in convertibles with a favorable balance of upside potential to downside risk.

     One effect of the recent  sharp  stock  market  decline has been a dramatic
slowdown in new convertibles  coming to market.  Only a few deals were priced in
April and May, in contrast to the first-quarter deluge. We expect issuance to be
moderate over the summer months. Despite this lull, year-to-date new issuance is
quite strong, with $30.9 billion in convertibles priced through May 2000, versus
$9.2 billion for the first five months of 1999.

     We feel that  current  convertible  valuations  are  attractive.  Given the
moderating  pace of new  issuance,  the relative lack of supply will keep upward
pressure on the prices of issues with significant call protection.  In addition,
forced conversions and redemptions will continue to occur, which should increase
demand for the remaining  issues.  Overall,  liquidity has been quite reasonable
given the extreme market environment.

     Our  principal  strategy  has been to take  profits  on highly  appreciated
issues and reinvest the proceeds in securities that offer a good balance between
the potential for  appreciation  due to the  underlying  stocks and the downside
protection  of  strong  fixed  income  properties.  Given  the  market's  recent
volatility,  we continue to place a heavy  emphasis on securities  with downside
protection.  We believe  this is  particularly  important  today,  when there is
considerable potential for interest rates to move higher.

     In  summary,  we note that  this has been a very  volatile  market  for all
financial  assets,  but  that  balanced  convertibles  have  provided  favorable
absolute and relative  returns as well as good downside  protection when needed.
Finally,  we reiterate that balanced  convertibles are attractively priced today
and should continue to provide the reasonable return/risk trade-off we desire.


Oaktree Capital Management, LLC


June 9, 2000

                                       7
<PAGE>



FUND PROFILE
CONVERTIBLE SECURITIES FUND

This  Profile  provides a snapshot of the fund's  characteristics  as of May 31,
2000,  compared where  appropriate to an unmanaged  index.  Key elements of this
Profile are defined on pages 9 and 10.


FINANCIAL ATTRIBUTES
-------------------------------------------
Number of Securities                     80
Yield                                  4.0%
Conversion Premium                    29.8%
Average Weighted Maturity         6.1 years
Average Coupon                         4.3%
Average Quality                           B
Average Duration                  4.7 years
Foreign Holdings                       8.6%
Turnover Rate                         200%*
Expense Ratio                        0.60%*
Cash Reserves                          4.2%
*Annualized.


DISTRIBUTION BY CREDIT QUALITY
(% OF BONDS)
-------------------------------------------
Aaa/AAA                                1.1%
Aa/AA                                  0.0
A/A                                    3.0
Baa/BBB                               12.9
Ba/BB                                 10.4
B/B                                   30.7
Less than B/B                         10.7
Not Rated                             31.2
-------------------------------------------
Total                                100.0%


VOLATILITY MEASURES
-------------------------------------------
               CONVERTIBLE         S&P 500
               SECURITIES
-------------------------------------------
R-Squared           0.45             1.00
Beta                0.59             1.00



TEN LARGEST HOLDINGS
(% OF TOTAL NET ASSETS)
-------------------------------------------
American Tower Corp.                   3.5%
Titan Capital Trust                    3.4
Nextel Communications, Inc.            3.3
SCI Systems Inc.                       3.2
EchoStar Communications Corp.          2.8
Sepracor Inc.                          2.8
Rational Software Corp.                2.7
Semtech Corp.                          2.6
Solectron Corp.                        2.4
SEACOR Holdings, Inc.                  2.3
-------------------------------------------
Top Ten                               29.0%


DISTRIBUTION BY MATURITY
(% OF BONDS)
-------------------------------------------
Under 1 Year                           0.0%
1-5 Years                             34.7
5-10 Years                            65.3
10-20 Years                            0.0
20-30 Years                            0.0
Over 30 Years                          0.0
-------------------------------------------
Total                                100.0%

                                       8
<PAGE>

SECTOR DIVERSIFICATION (% OF PORTFOLIO)
--------------------------------------------------------------------------------
                                      MAY 31, 1999             MAY 31, 2000
                                      --------------------------------------
                                       CONVERTIBLE              CONVERTIBLE
                                        SECURITIES               SECURITIES
                                      --------------------------------------
Auto & Transportation .................     8.4%                     2.4%
Consumer Discretionary ................    20.7                      6.1
Consumer Staples ......................     1.5                      0.0
Financial Services ....................     5.1                      3.1
Health Care ...........................    16.6                     15.5
Integrated Oils .......................     2.1                      2.7
Other Energy ..........................     6.6                     13.0
Materials & Processing ................     1.8                      2.4
Producer Durables .....................     4.2                      7.0
Technology ............................    22.2                     32.3
Utilities .............................    10.8                     15.5
Other .................................     0.0                      0.0
--------------------------------------------------------------------------------




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

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

AVERAGE QUALITY.  An indicator of credit risk, this figure is the average of the
ratings assigned to a fund's securities holdings by credit-rating  agencies. The
agencies make their  judgment after  appraising an issuer's  ability to meet its
obligations.  Quality is graded on a scale,  with Aaa or AAA indicating the most
creditworthy bond issuers.

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

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.

CONVERSION PREMIUM.  The average percentage by which the weighted average market
price of the convertible  securities held by a fund exceeds the weighted average
market price of their  underlying  common  stocks.  For  example,  if a stock is
trading at $25 per share and a bond  convertible  into the stock is trading at a
price equivalent to $30 per share of stock, the conversion  premium is 20% ($5 /
$25 = 20%).

                                       9
<PAGE>

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

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

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

FOREIGN  HOLDINGS.  The  percentage  of  a  fund's  net  assets  represented  by
securities of companies based outside the United States.

NUMBER OF SECURITIES. An indicator of diversification.  The more separate issues
a fund holds,  the less  susceptible it is to a price decline  stemming from the
problems of a particular security.

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.

SECTOR  DIVERSIFICATION.  The percentages of a fund's  securities 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.  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.

                                       10
<PAGE>

PERFORMANCE SUMMARY
CONVERTIBLE SECURITIES 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: JUNE 17, 1986-MAY 31, 2000
--------------------------------------------------------
        CONVERTIBLE SECURITIES FUND      FIRST BOSTON*
FISCAL   CAPITAL  INCOME   TOTAL             TOTAL
YEAR     RETURN   RETURN   RETURN           RETURN
--------------------------------------------------------
1986     -2.0%    1.8%    -0.2%               1.6%
1987    -19.0     4.2     -14.8              -5.4
1988     11.4     7.4      18.8              16.5
1989     10.7     7.0      17.7              16.3
1990    -16.3     5.4     -10.9              -8.7
1991     21.7     7.5      29.2              24.6
1992     19.9     6.1      26.0              21.7
1993      9.5     4.4      13.9              19.2
--------------------------------------------------------


TOTAL INVESTMENT RETURNS: JUNE 17, 1986-MAY 31, 2000
--------------------------------------------------------
        CONVERTIBLE SECURITIES FUND      FIRST BOSTON*
FISCAL   CAPITAL  INCOME   TOTAL             TOTAL
YEAR     RETURN   RETURN   RETURN           RETURN
--------------------------------------------------------
1994     -8.5%    4.1%     -4.4%             -3.9%
1995     11.9     5.2      17.1              24.0
1996      9.9     5.0      14.9              15.3
1997     10.6     4.2      14.8              15.4
1998     -6.4     4.2      -2.2               1.4
1999     18.7     6.1      24.8              30.6
2000**   10.1     1.9      12.0              10.4
--------------------------------------------------------
 *CS First Boston Convertibles Index.
**Six months ended May 31, 2000.
See  Financial  Highlights  table  on page 17 for  dividend  and  capital  gains
information for the past five years.


AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED MARCH 31, 2000*
--------------------------------------------------------------------------------
                                                                 10 YEARS
                        INCEPTION                       ------------------------
                          DATE      1 YEAR    5 YEARS   CAPITAL  INCOME   TOTAL
--------------------------------------------------------------------------------
Convertible Securities
  Fund                  6/17/1986   51.11%   17.60%      8.78%    5.17%   13.95%
--------------------------------------------------------------------------------
*SEC rules require that we provide this average annual total return  information
through the latest calendar quarter.

                                       11
<PAGE>

FINANCIAL STATEMENTS
MAY 31, 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.

--------------------------------------------------------------------------------
                                                 FACE               MARKET
                                               AMOUNT               VALUE*
CONVERTIBLE SECURITIES FUND                     (000)                (000)
--------------------------------------------------------------------------------
CONVERTIBLE BONDS (72.7%)
--------------------------------------------------------------------------------
AUTO & TRANSPORTATION (1.5%)
Tower Automotive Inc.
   5.00%, 8/1/2004                          $   5,730           $    4,613
                                                                ----------
CONSUMER DISCRETIONARY (5.2%)
EchoStar Communications Corp.
(1)4.875%, 1/1/2007                             8,110                8,597
Getty Images, Inc.
(1)5.00%, 3/15/2007                             4,595                3,515
IMAX Corp.
   5.75%, 4/1/2003                                415                  460
Jacor Communications, Inc.
   0.00%, 2/9/2018                              1,125                  667
Lamar Advertising Co.
   5.25%, 9/15/2006                             2,605                2,761
                                                                ----------
                                                                    16,000
                                                                ----------
FINANCIAL SERVICES (1.1%)
American International Group Inc.
   0.50%, 5/15/2007                             3,295                3,208
                                                                ----------
HEALTH CARE (13.3%)
Affymetrix, Inc.
(1)4.75%, 2/15/2007                               705                  465
   5.00%, 10/1/2006                             2,065                2,323
Alpharma, Inc.
   3.00%, 6/1/2006                              1,145                1,810

--------------------------------------------------------------------------------
                                                 FACE               MARKET
                                               AMOUNT               VALUE*
                                                (000)                (000)
--------------------------------------------------------------------------------
ALZA Corp.
   0.00%, 7/14/2014                         $   2,540           $    1,635
Athena Neurosciences Inc.
   4.75%, 11/15/2004                            2,460                3,035
COR Therapeutics, Inc.
(1)5.00%, 3/1/2007                              3,320                3,554
Human Genome Sciences, Inc.
   3.75%, 3/15/2007                             1,960                1,235
Imclone Systems, Inc.
(1)5.50%, 3/1/2005                              4,920                4,114
Incyte Pharmaceuticals, Inc.
(1)5.50%, 2/1/2007                              3,495                2,250
Ivax Corp.
(1)5.50%, 5/15/2007                             3,650                4,398
Millennium Pharmaceuticals, Inc.
   5.50%, 1/15/2007                             4,405                5,110
Roche Holdings, Inc.
   0.00%, 4/20/2010                             4,055                2,278
Sepracor Inc.
(1)5.00%, 2/15/2007                             6,730                8,076
   7.00%, 12/15/2005                              285                  472
                                                                ----------
                                                                    40,755
                                                                ----------
INTEGRATED OILS (2.6%)
Devon Energy Corp.
   4.95%, 8/15/2008                             6,095                6,125
Kerr-McGee Corp.
   5.25%, 2/15/2010                             1,535                1,798
                                                                ----------
                                                                     7,923
                                                                ----------
                                       12
<PAGE>
--------------------------------------------------------------------------------
                                                 FACE               MARKET
                                               AMOUNT               VALUE*
                                                (000)                (000)
--------------------------------------------------------------------------------
OTHER ENERGY (6.7%)
Anadarko Petroleum Corp.
   0.00%, 3/7/2020                          $   8,915           $    6,051
Pride International, Inc.
   0.00%, 4/24/2018                            10,435                4,409
SEACOR Holdings, Inc.
   5.375%, 11/15/2006                           6,730                7,193
Transocean Sedco Forex Inc.
   0.00%, 5/24/2020                             4,845                2,846
                                                                ----------
                                                                    20,499
                                                                ----------
PRODUCER DURABLES (6.7%)
American Tower Corp.
   5.00%, 2/15/2010                            11,595               10,726
Efficient Networks, Inc.
(1)5.00%, 3/15/2005                             3,865                2,474
Kulicke & Soffa Industries, Inc.
   4.75%, 12/15/2006                            1,550                1,974
Mark IV Industries, Inc.
   4.75%, 11/1/2004                             1,555                1,434
Pinnacle Holdings, Inc.
(1)5.50%, 9/15/2007                             4,870                3,993
                                                                ----------
                                                                    20,601
                                                                ----------
TECHNOLOGY (27.5%)
COMMUNICATIONS TECHNOLOGY (5.0%)
Aether Systems, Inc.
   6.00%, 3/22/2005                             4,325                3,741
Gilat Satellite Networks Ltd.
(1)4.25%, 3/15/2005                            10,005                7,179
Juniper Networks, Inc.
   4.75%, 3/15/2007                             5,510                4,436

COMPUTER SERVICES SOFTWARE & SYSTEMS (2.9%)
Mail.com, Inc.
(1)7.00%, 2/1/2005                              1,590                  700
Rational Software Corp.
(1)5.00%, 2/1/2007                              6,745                8,254

ELECTRONICS--SEMICONDUCTORS/COMPONENTS (12.7%)
ASM Lithography Holding NV
(1)4.25%, 11/30/2004                            2,175                2,523
Amkor Technologies, Inc.
(1)5.00%, 3/15/2007                             6,095                6,110
Burr-Brown Corp.
(1)4.25%, 2/15/2007                             1,440                1,732
Cymer, Inc.
   3.50%, 8/6/2004                              4,645                4,506
Cypress Semiconductor Corp.
   4.00%, 2/1/2005                              4,610                5,336
LSI Logic Corp.
   4.00%, 2/15/2005                             4,780                4,918
S3 Inc.
   5.75%, 10/1/2003                               450                  458
Semtech Corp.
(1) 4.50%, 2/1/2007                             9,340                8,079
TriQuint Semiconductor, Inc.
(1)4.00%, 3/1/2007                              2,895                2,654
Vitesse Semiconductor Corp.
(1)4.00%, 3/15/2005                             3,355                2,629


--------------------------------------------------------------------------------
                                                 FACE               MARKET
                                               AMOUNT               VALUE*
                                                (000)                (000)
--------------------------------------------------------------------------------
ELECTRONICS--TECHNOLOGY (6.9%)
SCI Systems Inc.
   3.00%, 3/15/2007                         $   9,375           $    9,750
Sanmina Corp.
   4.25%, 5/1/2004                              2,600                4,046
Solectron Corp.
   0.00%, 5/8/2020                             12,915                7,362
                                                                ----------
                                                                    84,413
                                                                ----------
UTILITIES (8.1%)
Level 3 Communications, Inc.
   6.00%, 3/15/2010                             7,160                5,925
NTL Inc.
(1)5.75%, 12/15/2009                            5,895                4,569
Nextel Communications, Inc.
(1)5.25%, 1/15/2010                            11,545               10,145
Primus Telecommunications Group, Inc.
(1)5.75%, 2/15/2007                             5,855                4,216
                                                                ----------
                                                                    24,855
                                                                ----------
--------------------------------------------------------------------------------
TOTAL CONVERTIBLE BONDS
  (COST $232,167)                                                  222,867
--------------------------------------------------------------------------------


                                               Shares
--------------------------------------------------------------------------------
CONVERTIBLE PREFERRED STOCKS (23.1%)
--------------------------------------------------------------------------------
AUTO & TRANSPORTATION (0.8%)
  Tower Automotive Capital Trust
   6.75% Cvt. Pfd.                             71,800                2,369
                                                                ----------
CONSUMER DISCRETIONARY (0.6%)
  Emmis Communications Corp.
   6.25% Cvt. Pfd.                             36,800                1,877
                                                                ----------
ENERGY (5.7%)
o(1)AES Trust VII
   6.00% Cvt. Pfd.                             86,700                4,964
  Apache Corp.
   6.50% Cvt. Pfd.                             83,000                4,363
  EVI, Inc.
   5.00% Cvt. Pfd.                            125,700                6,049
  Pogo Trust I
   6.50% Cvt. Pfd.                             37,300                2,156
                                                                ----------
                                                                    17,532
                                                                ----------

FINANCIAL SERVICES (2.0%)
  Ace, Ltd. 8.25% Cvt. Pfd.                   100,800                5,998
                                                                ----------
HEALTH CARE (1.6%)
o Biovail Corp. 6.75% Cvt. Pfd.               102,800                4,754
                                                                ----------
MATERIALS & PROCESSING (2.3%)
  Georgia Pacific Group 7.50%
   Cvt. Pfd.                                   13,700                  498
  Sealed Air Corp. $2.00 Cvt. Pfd.            119,800                6,499
                                                                ----------
                                                                     6,997
                                                                ----------
TECHNOLOGY (3.4%)
(1)Titan Capital Trust 5.75% Cvt. Pfd.        226,000               10,509
                                                                ----------
UTILITIES (6.7%)
  Broadwing Inc. 6.75% Cvt. Pfd                51,100                2,223
  Decs Trust VI 6.25% Cvt. Pfd.                30,200                1,683
  Global Crossing Holding Ltd.
   7.00% Cvt. Pfd.                             14,550                2,521

                                       13
<PAGE>
--------------------------------------------------------------------------------
                                                                    MARKET
                                                                    VALUE*
CONVERTIBLE SECURITIES FUND                    SHARES                (000)
--------------------------------------------------------------------------------
  MediaOne Group, Inc. 7.00%
   Cvt. Pfd.                                   20,600                  932
  MGC Communications, Inc.
   7.25% Cvt. Pfd.                             41,000                1,640
(1)PSINet Inc. 7.00% Cvt. Pfd.                183,700                6,246
  UnitedGlobalCom Inc. 7.00%
   Cvt. Pfd.                                   89,600                4,077
  Winstar Communications, Inc.
   7.25% Cvt. Pfd.                              1,400                1,204
                                                                ----------
                                                                    20,526
                                                                ----------
--------------------------------------------------------------------------------
TOTAL CONVERTIBLE PREFERRED STOCKS
  (COST $73,364)                                                    70,562
--------------------------------------------------------------------------------
                                                 Face
                                               Amount
                                                (000)
--------------------------------------------------------------------------------
TEMPORARY CASH INVESTMENTS (6.4%)
--------------------------------------------------------------------------------
REPURCHASE AGREEMENTS
Collateralized by U.S. Government
  Obligations in a Pooled
  Cash Account
  6.38%, 6/1/2000                             $12,837               12,837
  6.43%, 6/1/2000--Note F                       6,730                6,730
--------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
  (COST $19,567)                                                    19,567
--------------------------------------------------------------------------------
TOTAL INVESTMENTS (102.2%)
  (COST $325,098)                                                  312,996
--------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-2.2%)
--------------------------------------------------------------------------------
Other Assets--Note C                                                 4,879
Liabilities--Note F                                                (11,549)
                                                                ----------
                                                                    (6,670)
--------------------------------------------------------------------------------
NET ASSETS (100%)
--------------------------------------------------------------------------------
Applicable to 22,251,650 outstanding
 $.001 par value shares of beneficial interest.
 (unlimited authorization)                                        $306,326
================================================================================
NET ASSET VALUE PER SHARE                                           $13.77
================================================================================
  *See Note A in Notes to Financial Statements.
  oNon-income  producing  security.  New issue that has not
   paid a dividend as of May 31, 2000.
(1)Security  exempt from  registration  under Rule 144A of the Securities Act of
1933.  These  securities may be sold in transactions  exempt from  registration,
normally to qualified institutional buyers. At May 31, 2000, the aggregate value
of these securities was $121,945,000, representing 39.8% of net assets.



--------------------------------------------------------------------------------
                                                          AMOUNT      PER
                                                           (000)    SHARE
--------------------------------------------------------------------------------
AT MAY 31, 2000, NET ASSETS CONSISTED OF:
--------------------------------------------------------------------------------
Paid in Capital                                         $283,242    $12.73
Undistributed Net
 Investment Income                                         2,422       .11
Accumulated Net Realized Gains                            32,764      1.47
Unrealized Depreciation--Note E                          (12,102)     (.54)
--------------------------------------------------------------------------------
NET ASSETS                                              $306,326    $13.77
================================================================================

                                       14
<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.


--------------------------------------------------------------------------------
                                                   CONVERTIBLE SECURITIES FUND
                                                 SIX MONTHS ENDED MAY 31, 2000
                                                                         (000)
--------------------------------------------------------------------------------
INVESTMENT INCOME
Income
   Dividends                                                           $  1,474
   Interest                                                               4,743
   Security Lending                                                          34
                                                                       ---------
      Total Income                                                        6,251
                                                                       ---------
Expenses
   Investment Advisory Fees--Note B
      Basic Fee                                                             544
      Performance Adjustment                                               (194)
   The Vanguard Group--Note C
      Management and Administrative                                         394
      Marketing and Distribution                                             13
   Custodian Fees                                                             9
   Auditing Fees                                                              4
   Shareholders' Reports                                                      7
                                                                       ---------
     Total Expenses                                                         777
--------------------------------------------------------------------------------
NET INVESTMENT INCOME                                                     5,474
--------------------------------------------------------------------------------
REALIZED NET GAIN ON INVESTMENT SECURITIES SOLD                          32,850
--------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION
 (DEPRECIATION) OF INVESTMENT SECURITIES                                (25,387)
--------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                    $12,937
================================================================================

                                       15
<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>
-----------------------------------------------------------------------------------------------------------
                                                                            CONVERTIBLE SECURITIES  FUND
                                                                          ---------------------------------
                                                                             SIX MONTHS                YEAR
                                                                                  ENDED               ENDED
                                                                          MAY  31, 2000       NOV. 30, 1999
                                                                                  (000)               (000)
-----------------------------------------------------------------------------------------------------------
<S>                                                                               <C>                 <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
   Net Investment Income                                                  $      5,474        $      7,219
   Realized Net Gain                                                            32,850              10,911
   Change in Unrealized Appreciation (Depreciation)                            (25,387)             19,254
                                                                           --------------------------------
      Net Increase in Net Assets Resulting from Operations                      12,937              37,384
                                                                           --------------------------------
DISTRIBUTIONS
   Net Investment Income                                                        (4,219)             (8,161)
   Realized Capital Gain                                                        (9,590)                 --
                                                                           --------------------------------
      Total Distributions                                                      (13,809)             (8,161)
                                                                           --------------------------------
CAPITAL SHARE TRANSACTIONS1
   Issued                                                                      151,496              28,408
   Issued in Lieu of Cash Distributions                                         12,342               6,782
   Redeemed                                                                    (36,272)            (56,911)
                                                                           --------------------------------
      Net Increase (Decrease) from Capital Share Transactions                  127,566             (21,721)
-----------------------------------------------------------------------------------------------------------
   Total Increase                                                              126,694               7,502
-----------------------------------------------------------------------------------------------------------
NET ASSETS
   Beginning of Period                                                         179,632             172,130
                                                                           --------------------------------

   End of Period                                                              $306,326            $179,632
===========================================================================================================

1Shares Issued (Redeemed)
   Issued                                                                       10,220               2,386
   Issued in Lieu of Cash Distributions                                            925                 603
   Redeemed                                                                     (2,523)             (4,869)
                                                                           --------------------------------
     Net Increase (Decrease) in Shares Outstanding                               8,622              (1,880)
===========================================================================================================
</TABLE>

                                       16
<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>
---------------------------------------------------------------------------------------------------------------
                                                                      CONVERTIBLE SECURITIES FUND
                                                                        YEAR ENDED NOVEMBER 30,
FOR A SHARE OUTSTANDING               SIX MONTHS ENDED    -----------------------------------------------------
THROUGHOUT EACH PERIOD                 MAY 31, 2000            1999        1998       1997      1996      1995
---------------------------------------------------------------------------------------------------------------
<S>                                              <C>          <C>         <C>        <C>       <C>       <C>
NET ASSET VALUE, BEGINNING OF PERIOD            $13.18       $11.10      $13.01     $13.07    $12.03    $10.94
---------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
   Net Investment Income                           .27          .52         .52        .53       .43       .52
   Net Realized and Unrealized Gain (Loss)
      on Investments                              1.27         2.13        (.77)      1.17      1.29      1.26
                                              -----------------------------------------------------------------
      Total from Investment Operations            1.54         2.65        (.25)      1.70      1.72      1.78
                                              -----------------------------------------------------------------
DISTRIBUTIONS
   Dividends from Net Investment Income           (.25)        (.57)       (.54)      (.47)     (.54)     (.51)
   Distributions from Realized Capital Gains      (.70)          --       (1.12)     (1.29)     (.14)     (.18)
                                              -----------------------------------------------------------------
      Total Distributions                         (.95)        (.57)      (1.66)     (1.76)     (.68)     (.69)
---------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                  $13.77       $13.18      $11.10     $13.01    $13.07    $12.03
===============================================================================================================
TOTAL RETURN                                     12.03%       24.85%      -2.16%     14.81%    14.88%    17.10%
===============================================================================================================

RATIOS/SUPPLEMENTAL DATA
   Net Assets, End of Period (Millions             $306         $180        $172       $189      $170      $172
   Ratio of Total Expenses to
       Average Net Asset                         0.60%*        0.55%       0.73%      0.67%     0.69%     0.75%
   Ratio of Net Investment Income to
       Average Net Assets                        4.20%*        4.30%       4.36%      4.29%     3.43%     4.63%
   Portfolio Turnover Rate                        200%*         162%        186%       182%       97%       46%
===============================================================================================================
*Annualized.
</TABLE>

                                       17
<PAGE>

NOTES TO FINANCIAL STATEMENTS

Vanguard Convertible  Securities 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.  Bonds 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.
Temporary cash investments are valued at 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.  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.

     5. OTHER:  Dividend  income is recorded on the ex-dividend  date.  Security
transactions  are accounted for on the date the  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.  Discounts  on  debt
securities  purchased  are  accreted  to  interest  income over the lives of the
respective securities.

B. Oaktree Capital Management, LLC, provides investment advisory services to the
fund for a fee  calculated at an annual  percentage  rate of average net assets.
The basic fee is subject to quarterly  adjustments based on performance relative
to the Credit  Suisse First Boston  Convertible  Securities  Index.  For the six
months ended May 31, 2000, the advisory fee represented an effective annual rate
of 0.42% of the fund's average net assets before a decrease of $194,000  (0.15%)
based on performance.

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 May 31,  2000,  the fund had  contributed  capital  of  $62,000 to
Vanguard (included in Other Assets), representing 0.02% of the fund's net assets
and 0.06% of  Vanguard's  capitalization.  The fund's  trustees and officers are
also directors and officers of Vanguard.

                                       18
<PAGE>

D. During the six months ended May 31, 2000, the fund purchased  $373,157,000 of
investment securities and sold $242,466,000 of investment securities, other than
temporary cash investments.

E. At May 31, 2000, net  unrealized  depreciation  of investment  securities for
financialreporting  and federal income tax purposes was $12,102,000,  consisting
of unrealized  gains of $16,768,000 on securities  that had risen in value since
their  purchase and  $28,870,000  in unrealized  losses on  securities  that had
fallen in value since their purchase.

F. The market value of securities on loan to broker/dealers at May 31, 2000, was
$6,581,000,  for  which  the fund  held  cash  collateral  of  $6,730,000.  Cash
collateral received is invested in repurchase agreements.

                                       19
<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.

                                       20
<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.

   Six of Vanguard's seven 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.

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 LOGO]
[THE VANGUARD GROUP(R) 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.




Q822 072000

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






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