VANGUARD QUANTITATIVE PORTFOLIOS INC
N-30D, 1994-08-23
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<PAGE>   1
CHAIRMAN'S LETTER

FELLOW SHAREHOLDER:

Common stock prices experienced two significant downdrafts--one in late 
March, the other in late June--during the six months ended June 30, the first 
half of Vanguard Quantitative Portfolios' 1994 fiscal year. Nonetheless, 
reasonable strength during the remainder of the six-month period held the net 
decline in the total return of all U.S. stocks to -4.5%.
       Relative to the return of -3.4% on the unmanaged Standard & Poor's 500
Composite Stock Price Index, dominated by the performance of both growth and
value stocks with large market capitalizations, the Fund's total return
(capital change plus income) of -4.8% lagged by a modest margin. Our return
also trailed the -3.6% return achieved by the average growth and income fund,
which has investment objectives and policies similar to ours. This table
presents the comparisons:

<TABLE>
<CAPTION>
- - --------------------------------------------------------
                                          Total Return
                                        ----------------
                                        Six Months Ended
                                          June 30, 1994
- - --------------------------------------------------------
<S>                                           <C>
VANGUARD QUANTITATIVE PORTFOLIOS              -4.8%
- - --------------------------------------------------------
STANDARD & POOR'S 500 STOCK INDEX             -3.4%
AVERAGE GROWTH AND INCOME FUND                -3.6
- - --------------------------------------------------------
</TABLE>

The Fund's total return is based on net asset values of $16.45 per share on
December 31, 1993, and $15.14 on June 30, 1994, with the latter figure adjusted
to take into account a dividend of $.15 per share from net investment income
and a carry-over distribution of $.40 per share from net capital gains realized
during 1993 and paid in March.

*  THE PERIOD IN REVIEW
Following two years of relative tranquility, substantial volatility returned to
the stock market during the past six months, and stocks in the aggregate showed
a net decline. While the decline in stock prices from the February high to the
June low (-8%) was fairly significant, it was a far cry from the market's sharp
dips in 1990 (-20%), 1987 (-34%), 1981 (-18%), and 1973-74 (-48%).  (Price
change from high to low, excluding income.)
       Although the recent price decline could be described as "moderate" in an
historical sense, it seemed to reflect investor concerns beyond the actual
dimensions of the problems confronting the market, most notably possible future
inflation. Surely the concerns were increased by the sharp six-month decline
(-15%) in the prices of long-term U.S. Treasury bonds, as interest rates leaped
upward--from 6.4% at the start of our fiscal period to 7.6% at its close. By
way of perspective, this yield was 7.4% when 1993 began.
       While these inflationary concerns have yet to be reflected in the
Consumer Price Index, the Federal Reserve has acted to "tighten" the money
supply and slow economic growth and potential future inflation, raising the
Federal funds rate (at which banks borrow from one another) four times--in
February, March, April, and again in May--from 3.00% to 4.25%. Theory suggests
that increases in short-term rates should be regarded by market participants as
a restraint on potential inflation, and thus cause long-term rates to fall.
However, this theory seldom holds true in practice, and 1994 has proved to be
no exception.
       In the stock market, the six-month period was the reverse of 1993 in at
least two respects: (1) stocks with large market capitalizations outpaced those
with medium and small market capitalizations; and (2) traditional actively
managed funds generally fell short of the unmanaged market indexes.
       One equity market factor that persisted during the first half of 1994
was the continued ascendancy of value stocks--those with above-average dividend
yields and below-average price-book value ratios--over growth stocks--those
that provide lower yields but presumably richer prospects for earnings growth.
The disparity in returns thus far in 1994, however, has been far short of last
year's, when the Standard & Poor's/





                                       1
<PAGE>   2
BARRA Growth and Value Indexes provided returns of +1.7% and +18.6%,
respectively. During the past six months, the comparable figures were -4.4% for
the Growth Index and -2.4% for the Value Index. As we have often noted, the
relationship of the two groups is quite cyclical, and the outperformance of
value stocks is unlikely to persist. This cycle of "leadership" and
"followership" for growth and value stocks highlights the advantage of broad
diversification through ownership of the entire Standard & Poor's 500 Index.
       As noted in the table at the start of this letter, the Fund's return of
- - -4.8% was about one percentage point below the returns achieved by our two
customary benchmarks, the Standard & Poor's 500 Index and the average growth
and income mutual fund. Our shortfall to both standards was largely the result
of a modest overweighting in utility stocks, whose prices tumbled sharply as
interest rates turned upward. Also contributing to our lagging return were some
disappointing individual stock selections, particularly in the basic materials
and financial sectors.
       With this year but half over, it would, I think, be unwise to place any
particular credence in this small shortfall. Since our inception at the end of
1986, the computer-driven investment strategy of our adviser, Franklin
Portfolio Associates, has provided rewarding returns relative to our benchmark
standards. Indeed, our average annual rate of total return for the period from
December 31, 1986, to June 30, 1994, has been +12.2%, compared with an average
of +12.0% for the Standard & Poor's 500 Index and +10.2% for the average growth
and income fund.

*  IN SUMMARY
That negative markets should prevail during the first half of 1994 was hardly
unpredictable. Indeed, in my letter to shareholders in the Annual Report just
six months ago, I reminded you that "with stock yields at extremely low levels
on an historical basis, it would be logical to assume that the risks involved
in stocks today are higher than historical norms." That risk surely has been
manifested thus far in 1994, and there may well be more to come. That said,
Vanguard Quantitative Portfolios is designed for the long-term investor, and we
would urge you, once again, to "stay the course."

Sincerely,


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

July 18, 1994

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





                                       2
<PAGE>   3
AVERAGE ANNUAL TOTAL RETURNS

THE AVERAGE ANNUAL TOTAL RETURNS FOR THE FUND (PERIODS ENDED JUNE 30, 1994) ARE
AS FOLLOWS:

<TABLE>
  <S>                 <C>                  <C>                           
  1 YEAR: +0.32%      5 YEARS: +10.79%     SINCE INCEPTION (12/10/86): +11.60%
</TABLE>

THE AVERAGE ANNUAL TOTAL RETURN SINCE INCEPTION INCLUDES A CAPITAL RETURN OF
+8.53% AND AN INCOME RETURN OF +3.07%. ALL OF THE DATA REPRESENT PAST
PERFORMANCE. THE INVESTMENT RETURN AND PRINCIPAL VALUE OF AN INVESTMENT WILL
FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR
LESS THAN THEIR ORIGINAL COST.





                                       3
<PAGE>   4
REPORT FROM THE INVESTMENT ADVISER

Evidence of an economic recovery continues to present itself in most areas of
the economy and of the country. A continuing balance-of-trade deficit, which
has caused certain upheavals in the international monetary markets, combined
with the vigilance of the Federal Reserve, has led to an increase in interest
rates. The upward pressure on interest rates has, in our opinion, some ways to
run, and this portends for some drifting in equity prices in the months ahead.
Nonetheless, the engines of economic growth have been started and are running
with a reasonable level of efficiency.
       The Clinton health care initiative has always had the potential to have
a major economic impact. Our current reading of the political tea leaves leads
us to believe that any measures emerging from Washington will be less draconian
than the initial indications have led us to believe, and may even have a
stabilizing and salubrious impact on the economy.
       It is still quite easy to cite economic and financial benchmarks which
indicate that equity prices are somewhat high.  However, the weakness in the
first half of the year has made any indica-tions of overvaluation less extreme,
as has the general clarifying and strengthening of the economic picture. Our
investment program has always been directed toward the long term, and we view
the shorter-term prognosticating of equity prices to be a difficult, if not
impossible, task. We view the long-term prospect for equities as quite
attractive, especially when compared to fixed-income alternatives.
       In the domestic equity markets, there were significant differences in
performance among different sectors of the market.  Growth companies continued
to be less favored by investors than more value-oriented issues, and smaller
securities (in terms of market capitalization) were significantly weaker than
larger ones. The volatility of individual stocks continues to appear higher
than normal to us, and all investors should be sensitive to what this increased
volatility means in terms of short-term uncertainty and risk. We, in this
regard, emphasize our long-term perspective in terms of investment objectives.
       Vanguard Quantitative Portfolios has completed seven and one-half years
of operations. We judge our own performance versus the unmanaged S&P 500 Index,
our investment policy proxy, and versus our competitors. For a competitive
proxy, we use the CADENCE mutual fund universe for growth and income mutual
funds. While we have lagged the Index and our competitors in the first half of
1994, our longer-term performance compares quite favorably to our performance
objectives. We do not always expect to have pleasing short-term results, but we
would be disappointed if our longer-term results lagged objectives. We would
remind our shareholders that our focus is on the longer term, and that we will
inevitably have periods when shorter-term performance will not compare
favorably with competitive benchmarks.

<TABLE>
<CAPTION>
- - ------------------------------------------------------
         Vanguard Quantitative Portfolios versus
           CADENCE Growth and Income Funds
         ----------------------------------------
         Periods Ended              VQP versus
         June 30, 1994           Competitor Funds
- - ------------------------------------------------------
         <S>                     <C>
         SINCE INCEPTION          17 OUT OF 133
         LAST 5 YEARS             36 OUT OF 187
         LAST 3 YEARS            106 OUT OF 213
         LAST 12 MONTHS          137 OUT OF 220
- - ------------------------------------------------------
</TABLE>
Source:  CADENCE.

In our last letter, we wrote about keeping the portfolio in line with the
Standard and Poor's 500 Index and about ensuring a high degree of conformity
with the returns of the Index, while trying to make deviations from this
performance occur on the positive side. We concluded by saying that investors
should regard their investment in the Fund as an equity proxy rather than as a
substitute for their own asset allocation process.
       Our strategy in Quantitative Portfolios is to build a margin of
superiority to the alternative ways that you could invest in equities by trying
to achieve many small positive differences in performance rather than a few big
ones. This strategy leads to our





                                       4
<PAGE>   5
being fully invested to the extent practical at all times, which means that the
fund's share value is almost certain to decline in a sustained bear market for
equities. Clearly, our strategy is more compatible with long-term equity
investors than with speculators.
       The S&P 500 Index has been a more-than-worthy opponent for managed
growth and income funds over the fund's lifetime. We believe our success in
outperforming this benchmark is illustrative of the effectiveness of the
Franklin game plan . . . seeking to win while avoiding periods of major loss.
Our goal with your assets is to be consistently above average. We believe that
consistency builds strong long-term performance, and will continue to make
Vanguard Quantitative Portfolios an attractive option for equity investors.

Respectfully,

John Nagorniak
Franklin Portfolio Associates

July 5, 1994





                                       5
<PAGE>   6
TOTAL INVESTMENT RETURN

The table below illustrates the returns for VANGUARD QUANTITATIVE PORTFOLIOS
from December 10, 1986, to June 30, 1994, the lifetime of the Fund. During this
period, stock prices fluctuated and were higher at the end than at the
beginning. These results should not be considered a representation of the
dividend income or capital gain or loss that may be realized from an investment
made in the Fund today.

<TABLE>
<CAPTION>
- - ------------------------------------------------------------------------------------------------------------------------------------
PERIOD                              PER SHARE DATA                         YEAR-END VALUE              TOTAL INVESTMENT RETURN
- - ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                           Annual Percentage Change*
                                                                                                           -------------------------
                                                             Value with Income       Vanguard                   Vanguard
Year Ended         Net Asset      Income    Capital Gains  Dividends & Capital   Quantitative     S&P 500   Quantitative    S&P 500
December 31            Value   Dividends    Distributions     Gains Reinvested     Portfolios       Index     Portfolios      Index
- - ------------------------------------------------------------------------------------------------------------------------------------
<S>                   <C>         <C>              <C>                  <C>           <C>         <C>            <C>        <C>
INITIAL (12/86)       $10.00          --               --               $10.00        $10,000     $10,000             --         --
- - ------------------------------------------------------------------------------------------------------------------------------------
1986                    9.69          --               --                 9.69          9,690       9,668        -  3.1%    -  3.3%
- - ------------------------------------------------------------------------------------------------------------------------------------
1987                    9.80      $  .25           $  .06                10.08         10,080      10,169         +  4.0     +  5.2
- - ------------------------------------------------------------------------------------------------------------------------------------
1988                   11.08         .35               --                11.77         11,773      11,847          +16.8      +16.5
- - ------------------------------------------------------------------------------------------------------------------------------------
1989                   14.14         .47               --                15.54         15,540      15,589          +32.0      +31.6
- - ------------------------------------------------------------------------------------------------------------------------------------
1990                   13.29         .47              .04                15.16         15,161      15,103         -  2.4     -  3.1
- - ------------------------------------------------------------------------------------------------------------------------------------
1991                   16.32         .47              .44                19.75         19,753      19,694          +30.3      +30.4
- - ------------------------------------------------------------------------------------------------------------------------------------
1992                   16.30         .44              .71                21.13         21,136      21,193         +  7.0     +  7.6
- - ------------------------------------------------------------------------------------------------------------------------------------
1993                   16.45         .39             1.69                24.06         24,061      23,325          +13.8      +10.1
- - ------------------------------------------------------------------------------------------------------------------------------------
1994 (6/30)            15.14         .15              .40                22.91         22,912      22,540         -  4.8     -  3.4
- - ------------------------------------------------------------------------------------------------------------------------------------
LIFETIME                           $2.99            $3.34                              +129.1%     +125.4%         +11.6%     +11.4%
- - ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>        

*  Adjusted to include reinvestment of income dividends and any capital gains 
   distributions both for the Fund and the Index.  

   Note: No adjustment has been made for income taxes payable by shareholders on
   reinvested income dividends and capital gains distributions.





                                       6
<PAGE>   7
STATEMENT OF NET ASSETS
                                                FINANCIAL STATEMENTS (unaudited)
                                                                   June 30, 1994

<TABLE>
<CAPTION>
                                                                                        Market
                                                                                         Value
                                                                 Shares                 (000)+
- - ----------------------------------------------------------------------------------------------
COMMON STOCKS (96.3%)
- - ----------------------------------------------------------------------------------------------
<S>                                                             <C>                  <C>
  General Electric Co.                                          381,600              $  17,792
  Wal-Mart Stores, Inc.                                         522,300                 12,666
  Philip Morris Cos., Inc.                                      224,900                 11,582
  Merck & Co., Inc.                                             369,800                 11,002
  Exxon Corp.                                                   171,700                  9,723
  BellSouth Corp.                                               156,800                  9,682
  Mobil Corp.                                                   118,400                  9,664
  GTE Corp.                                                     300,600                  9,469
  Amoco Corp.                                                   164,200                  9,359
  Procter & Gamble Co.                                          170,084                  9,078
  Ford Motor Co.                                                152,700                  9,009
  International Business
    Machines Corp.                                              149,100                  8,760
  Abbott Laboratories, Inc.                                     301,000                  8,729
  Johnson & Johnson                                             188,500                  8,082
  The Coca Cola Co.                                             182,700                  7,422
  Southwestern Bell Corp.                                       165,400                  7,195
  Sprint Corp.                                                  200,900                  7,006
  Citicorp                                                      175,100                  6,982
  Unilever NV                                                    66,700                  6,720
  Texas Instruments, Inc.                                        80,200                  6,376
  Bristol-Myers Squibb Co.                                      114,280                  6,128
  Chevron Corp.                                                 145,200                  6,080
  Travelers Inc.                                                183,600                  5,921
  Public Service Enterprise
    Group Inc.                                                  225,400                  5,860
  Motorola, Inc.                                                130,600                  5,812
  The Chase Manhattan Corp.                                     151,500                  5,795
  NationsBank, Inc.                                             110,900                  5,697
  Schering-Plough Corp.                                          89,800                  5,500
  Echlin, Inc.                                                  175,500                  5,287
  Sara Lee Corp.                                                235,500                  5,004
  Pacificorp                                                    295,000                  4,978
  Lincoln National Corp.                                        115,900                  4,911
  J.C. Penney Co., Inc.                                          87,100                  4,725
  Merrill Lynch & Co., Inc.                                     130,500                  4,568
  Royal Dutch Petroleum Co.                                      42,000                  4,394
  Baltimore Gas & Electric Co.                                  195,500                  4,154
  MCI Communications Corp.                                      184,200                  4,075
  International Paper Co.                                        61,000                  4,041
  E.I. du Pont de Nemours & Co.                                  66,400                  3,876
  Ameritech Corp.                                                99,900                  3,821
  Pacific Gas & Electric Co.                                    157,800                  3,748
  CIGNA Corp.                                                    50,900                  3,722
  Norwest Corp.                                                 141,400                  3,694
  Union Pacific Corp.                                            65,000                  3,681
  Anheuser-Busch Co., Inc.                                       72,500                  3,679
  Union Carbide Corp.                                           135,200                  3,617
  Chrysler Corp.                                                 74,300                  3,501
  The Goodyear Tire & Rubber Co.                                 94,500                  3,402
  Dresser Industries, Inc.                                      163,300                  3,348
  Monsanto Co.                                                   44,000                  3,328
  Blockbuster Entertainment Corp.                               127,800                  3,307
  Rockwell International Corp.                                   88,100                  3,293
  Coastal Corp.                                                 121,700                  3,286
  American Greetings Corp. Class A                              109,100                  3,246
  Archer-Daniels-Midland Co.                                    139,532                  3,244
  Service Corp. International                                   125,600                  3,234
  Deere & Co.                                                    47,800                  3,232
  PECO Energy Corp.                                             120,500                  3,178
  May Department Stores Co.                                      80,600                  3,164
  Pacific Enterprises                                           154,400                  3,069
  Federal National Mortgage Assn.                                36,700                  3,064
  Clorox Co.                                                     61,100                  2,986
  Ohio Edison Co.                                               165,900                  2,965
  Lockheed Corp.                                                 45,000                  2,942
  Computer Associates
    International, Inc.                                          73,400                  2,936
  Capital Cities/ABC, Inc.                                       40,100                  2,852
  Whitman Corp.                                                 183,300                  2,841
  Conagra, Inc.                                                  93,000                  2,837
  Dow Jones & Co., Inc.                                          90,900                  2,818
  Transamerica Corp.                                             51,100                  2,664
  Niagara Mohawk Power Corp.                                    167,500                  2,533
 *National Semiconductor Corp.                                  142,600                  2,460
  Colgate-Palmolive Co.                                          46,500                  2,418
 *The Kroger Co.                                                103,400                  2,404
  Pennzoil Co.                                                   46,500                  2,383
 *Cray Research, Inc.                                           105,100                  2,378
  Federal Home Loan
    Mortgage Corp.                                               38,900                  2,353
 *Toys R Us, Inc.                                                71,300                  2,335
 *Rowan Cos., Inc.                                              266,000                  2,328
  Consolidated Edison Co.
    of New York, Inc.                                            82,300                  2,181
  Beneficial Corp.                                               59,200                  2,161
  UST, Inc.                                                      79,300                  2,151
  Centex Corp.                                                   83,200                  2,142
  American Express Co.                                           78,700                  2,027
  Bausch & Lomb, Inc.                                            54,700                  2,024
 *Cisco Systems, Inc.                                            86,600                  2,003
  Caterpillar, Inc.                                              19,800                  1,980
  Alcan Aluminium Ltd.                                           86,500                  1,968
  Nucor Corp.                                                    28,700                  1,966
  Commonwealth Edison Co.                                        86,000                  1,957
  CBS, Inc.                                                       6,100                  1,891
  McDonald's Corp.                                               64,800                  1,871
  Mattel, Inc.                                                   73,375                  1,862
  Reebok International Ltd.                                      61,300                  1,831
  Pittston Services Group                                        66,300                  1,774
 *Federal Express Corp.                                          23,500                  1,754
</TABLE>





                                       7
<PAGE>   8
STATEMENT OF NET ASSETS (continued)
<TABLE>
<CAPTION>
                                                                                        Market
                                                                                         Value
                                                                 Shares                 (000)+
- - ----------------------------------------------------------------------------------------------
<S>                                                             <C>                 <C>
  Homestake Mining Co.                                           93,100             $    1,746
 *Compaq Computer Corp.                                          54,000                  1,742
  Ashland Oil, Inc.                                              51,700                  1,738
  Premark International, Inc.                                    23,000                  1,731
  Pep Boys (Manny, Moe & Jack)                                   54,300                  1,717
  Worthington Industries, Inc.                                   91,800                  1,698
  Enron Corp.                                                    51,400                  1,683
  USLIFE Corp.                                                   47,150                  1,674
  Wendys International, Inc.                                    105,300                  1,645
 *Crown Cork & Seal Co., Inc.                                    43,900                  1,635
  Mallinckrodt Group, Inc.                                       50,000                  1,625
  Norfolk Southern Corp.                                         25,600                  1,613
  The Tribune Co.                                                30,200                  1,608
  AT & T Corp.                                                   29,300                  1,593
  Hasbro, Inc.                                                   52,900                  1,567
  Comcast Corp. Class A                                          87,400                  1,562
  Ecolab, Inc.                                                   70,300                  1,547
  American Barrick Resources                                     64,000                  1,528
  General Motors Corp.                                           30,100                  1,513
  American Stores Co.                                            61,300                  1,502
  Avery Dennison Corp.                                           50,900                  1,476
  Browning-Ferris Industries, Inc.                               48,200                  1,464
  Salomon, Inc.                                                  30,400                  1,452
  Barnett Banks of Florida, Inc.                                 32,900                  1,439
  Black & Decker Corp.                                           79,400                  1,370
  Fleet Financial Group, Inc.                                    35,100                  1,325
  First Chicago Corp.                                            27,000                  1,299
  Sun Co., Inc.                                                  48,200                  1,295
  Handleman Co.                                                 127,900                  1,295
  The Seagram Co. Ltd.                                           42,700                  1,292
  Pall Corp.                                                     85,000                  1,275
  Tandy Corp.                                                    36,300                  1,252
  Morton International, Inc.                                     15,200                  1,186
 *Varity Corp.                                                   32,300                  1,175
  Intel Corp.                                                    19,900                  1,164
  Echo Bay Mines Ltd.                                           104,700                  1,126
  Ryder System, Inc.                                             44,400                  1,116
  Martin Marietta Corp.                                          25,200                  1,112
  Sonat, Inc.                                                    36,000                  1,107
  PepsiCo, Inc.                                                  36,100                  1,106
  ITT Corp.                                                      12,700                  1,037
  Chemical Banking Corp.                                         26,600                  1,024
  Fleetwood Enterprises, Inc.                                    53,000                  1,014
 *Promus Co. Inc.                                                34,100                  1,010
  Adolph Coors Co. Class B                                       55,900                    964
  SuperValu, Inc.                                                30,700                    929
  Hershey Foods Corp.                                            21,100                    915
  Textron, Inc.                                                  16,500                    864
  Dana Corp.                                                     29,200                    832
 *Tandem Computers, Inc.                                         71,000                    799
  Pioneer Hi Bred International                                  24,200                    793
  Suntrust Banks, Inc.                                           15,200                    735
  Bank of Boston Corp.                                           29,800                    734
  General Dynamics Corp.                                         17,800                    728
  Praxair, Inc.                                                  37,000                    721
  Loral Corp.                                                    20,300                    711
  Snap-On Inc.                                                   18,700                    697
 *Advanced Micro Devices, Inc.                                   27,700                    689
  First Union Corp.                                              14,900                    687
  Dover Corp.                                                    10,900                    642
  First Interstate Bancorp.                                       8,300                    639
  John H. Harland Co.                                            29,300                    637
  Maytag Corp.                                                   34,100                    631
 *National Intergroup, Inc.                                      34,700                    607
  NICOR, Inc.                                                    22,300                    588
  Newell Co.                                                     12,700                    587
  First Mississippi Corp.                                        38,100                    581
  American General Corp.                                         21,000                    580
  Meredith Corp.                                                 13,600                    578
  Continental Corp.                                              32,800                    508
  Westvaco Corp.                                                 15,900                    489
  Briggs & Stratton Corp.                                         7,200                    481
  Marriott International                                         18,000                    479
  American Electric Power Co., Inc.                              16,700                    472
  Shawmut National Corp.                                         19,500                    429
 *Biomet, Inc.                                                   40,800                    428
  USX-Marathon Group                                             22,600                    378
  Genuine Parts Co.                                              10,000                    361
  Brunswick Corp.                                                16,400                    361
  BankAmerica Corp.                                               7,100                    325
 *DSC Communications Corp.                                       16,200                    316
 *Hartmarx Corp.                                                 51,400                    315
  Phillips Petroleum Co.                                          9,900                    309
  Eastern Enterprises                                            12,200                    279
 *Lehman Brothers Holdings, Inc.                                 18,120                    274
  Harris Corp.                                                    5,800                    256
  Amerada Hess Corp.                                              5,100                    251
  CoreStates Financial Corp.                                      8,800                    227
  Transco Energy Co.                                             13,700                    223
  Pulte Corp.                                                     9,100                    209
 *Sun Microsystems, Inc.                                          7,100                    145
  McDonnell Douglas Corp.                                         1,100                    129
  Eaton Corp.                                                     2,300                    120
  Giant Food, Inc. Class A                                        4,800                     94
 *Intergraph Corp.                                                7,900                     74
  General Signal Corp.                                            1,900                     63
  Noram Energy Corp.                                              5,800                     35
  Yellow Corp.                                                      100                      2
- - ----------------------------------------------------------------------------------------------
TOTAL COMMON STOCKS
  (Cost $512,837)                                                                      526,916
- - ----------------------------------------------------------------------------------------------
</TABLE>





                                       8
<PAGE>   9
<TABLE>
<CAPTION>
                                                                   Face                 Market
                                                                 Amount                  Value
                                                                  (000)                 (000)+
- - ----------------------------------------------------------------------------------------------
<S>                                                            <C>                   <C>
TEMPORARY CASH INVESTMENTS (3.0%)
- - ----------------------------------------------------------------------------------------------
U.S. TREASURY BILL--Note E
    4.09%, 9/15/94                                             $    850              $     843
REPURCHASE AGREEMENT
  Collateralized by U.S. Government
    Obligations in a Pooled Cash
    Account 4.26%, 7/1/94                                        15,358                 15,358
- - ----------------------------------------------------------------------------------------------
TOTAL TEMPORARY CASH INVESTMENTS
    (Cost $16,201)                                                                      16,201
- - ----------------------------------------------------------------------------------------------
TOTAL INVESTMENTS (99.3%)
    (Cost $529,038)                                                                    543,117
- - ----------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (.7%)
- - ----------------------------------------------------------------------------------------------
  Other Assets--Note C                                                                  12,554
  Liabilities                                                                           (8,563)
                                                                                       -------
                                                                                         3,991
- - ----------------------------------------------------------------------------------------------
NET ASSETS (100%)
- - ----------------------------------------------------------------------------------------------
  Applicable to 36,146,063 outstanding
    $.001 par value shares
    (authorized 1,000,000,000 shares)                                                 $547,108
- - ----------------------------------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                                               $15.14
==============================================================================================
+See Note A to Financial Statements.
*Non-Income Producing Security.
</TABLE>

<TABLE>
<CAPTION>
- - ----------------------------------------------------------------------------------------------
AT JUNE 30, 1994, NET ASSETS CONSISTED OF:
- - ----------------------------------------------------------------------------------------------
                                                                 Amount                    Per
                                                                  (000)                  Share
                                                               --------                 ------
<S>                                                            <C>                      <C>
  Paid in Capital                                              $528,770                 $14.63
  Undistributed Net
    Investment Income                                             3,881                    .11
  Accumulated Net Realized Gains                                  1,160                    .03
  Unrealized Appreciation
    of Investments--Note E                                       13,297                    .37
- - ----------------------------------------------------------------------------------------------
NET ASSETS                                                     $547,108                 $15.14
- - ----------------------------------------------------------------------------------------------
</TABLE>





                                       9
<PAGE>   10
STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                                                                                   Six Months Ended
                                                                                                      June 30, 1994
                                                                                                              (000)
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                  <C>
INVESTMENT INCOME
     INCOME
           Dividends. . . . . . . . . . . . . . . . . . . . . . . . . . . .                              $   7,912
           Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                    359
- - -------------------------------------------------------------------------------------------------------------------
                 Total Income   . . . . . . . . . . . . . . . . . . . . . .                                  8,271
- - -------------------------------------------------------------------------------------------------------------------
     EXPENSES
           Investment Advisory Fees--Note B
             Basic Fees . . . . . . . . . . . . . . . . . . . . . . . . . .         $552
             Performance Adjustments  . . . . . . . . . . . . . . . . . . .           --                       552
                                                                                    ----
           The Vanguard Group--Note C
             Management and Administrative  . . . . . . . . . . . . . . . .          707
             Marketing and Distribution   . . . . . . . . . . . . . . . . .           53                       760
                                                                                    ----
           Taxes (other than income taxes)--Note A  . . . . . . . . . . . .                                     22
           Custodian's Fees     . . . . . . . . . . . . . . . . . . . . . .                                      3
           Auditing Fees        . . . . . . . . . . . . . . . . . . . . . .                                      5
           Shareholders' Reports  . . . . . . . . . . . . . . . . . . . . .                                     41
           Annual Meeting and Proxy Costs   . . . . . . . . . . . . . . . .                                      4
           Directors' Fees and Expenses   . . . . . . . . . . . . . . . . .                                      2
- - -------------------------------------------------------------------------------------------------------------------
                 Total Expenses   . . . . . . . . . . . . . . . . . . . . .                                  1,389
- - -------------------------------------------------------------------------------------------------------------------
                       Net Investment Income  . . . . . . . . . . . . . . .                                  6,882
- - -------------------------------------------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)
           Investment Securities Sold   . . . . . . . . . . . . . . . . . .                                  1,365
           Futures Contracts    . . . . . . . . . . . . . . . . . . . . . .                                   (204)
                       Realized Net Gain  . . . . . . . . . . . . . . . . .                                  1,161
- - -------------------------------------------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)
           Investment Securities  . . . . . . . . . . . . . . . . . . . . .                                (34,521)
           Futures Contracts    . . . . . . . . . . . . . . . . . . . . . .                                   (838)
- - -------------------------------------------------------------------------------------------------------------------
                       Change in Unrealized Appreciation (Depreciation) . .                                (35,359)
- - -------------------------------------------------------------------------------------------------------------------
                       Net Decrease in Net Assets Resulting from Operations                               $(27,316)
===================================================================================================================
</TABLE>





                                       10
<PAGE>   11
STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                                    SIX MONTHS ENDED               Year Ended
                                                                                       JUNE 30, 1994        December 31, 1993
                                                                                               (000)                    (000)
- - -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                       <C>                      <C>
INCREASE IN NET ASSETS
OPERATIONS
   Net Investment Income  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           $  6,882                $ 10,298
   Realized Net Gain  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              1,161                  61,441
   Change in Unrealized Appreciation (Depreciation) . . . . . . . . . . . . . . .            (35,359)                (12,404)
- - -----------------------------------------------------------------------------------------------------------------------------
         Net Increase (Decrease) in Net Assets Resulting from Operations  . . . .            (27,316)                 59,335
- - -----------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS (1)
   Net Investment Income  . . . . . . . . . . . . . . . . . . . . . . . . . . . .             (5,384)                (10,830)
   Realized Net Gain  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            (13,667)                (48,656)
- - -----------------------------------------------------------------------------------------------------------------------------
         Total Distributions  . . . . . . . . . . . . . . . . . . . . . . . . . .            (19,051)                (59,486)
- - -----------------------------------------------------------------------------------------------------------------------------
NET EQUALIZATION CREDITS--Note A  . . . . . . . . . . . . . . . . . . . . . . . .                480                     877
- - -----------------------------------------------------------------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS (2)
   Issued     -- Regular  . . . . . . . . . . . . . . . . . . . . . . . . . . . .             81,590                 111,687
              -- In Lieu of Cash Distributions  . . . . . . . . . . . . . . . . .             18,117                  57,229
              -- Exchange   . . . . . . . . . . . . . . . . . . . . . . . . . . .             18,642                  29,204
   Redeemed   -- Regular  . . . . . . . . . . . . . . . . . . . . . . . . . . . .            (41,068)                (56,419)
              -- Exchange   . . . . . . . . . . . . . . . . . . . . . . . . . . .            (15,022)                (27,219)
- - -----------------------------------------------------------------------------------------------------------------------------
         Net Increase from Capital Share Transactions . . . . . . . . . . . . . .             62,259                 114,482
- - -----------------------------------------------------------------------------------------------------------------------------
         Total Increase . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             16,372                 115,208
- - -----------------------------------------------------------------------------------------------------------------------------
NET ASSETS
   Beginning of Period  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            530,736                 415,528
- - -----------------------------------------------------------------------------------------------------------------------------
   End of Period (3)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           $547,108                $530,736
=============================================================================================================================
   (1)   Distributions Per Share
         Net Investment Income  . . . . . . . . . . . . . . . . . . . . . . . . .           $    .15                $    .39
         Realized Net Gain  . . . . . . . . . . . . . . . . . . . . . . . . . . .           $    .40                $   1.69
- - -----------------------------------------------------------------------------------------------------------------------------
   (2)   Shares Issued and Redeemed
         Issued . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .              6,302                   8,164
         Issued in Lieu of Cash Distributions . . . . . . . . . . . . . . . . . .              1,146                   3,501
         Redeemed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             (3,562)                 (4,892)
- - -----------------------------------------------------------------------------------------------------------------------------
                                                                                               3,886                   6,773
- - -----------------------------------------------------------------------------------------------------------------------------
   (3)   Undistributed Net Investment Income  . . . . . . . . . . . . . . . . . .           $  3,881                $  1,903
- - -----------------------------------------------------------------------------------------------------------------------------
</TABLE>





                                       11
<PAGE>   12
FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                                                                Year Ended December 31,
For a Share Outstanding                                    SIX MONTHS ENDED    -----------------------------------------------------
Throughout Each Period                                        JUNE 30, 1994      1993      1992       1991        1990         1989
- - ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                 <C>       <C>        <C>        <C>         <C>         <C>
NET ASSET VALUE, BEGINNING OF PERIOD  . . . . . . . . . .           $16.45     $16.30    $16.32     $13.29      $14.14       $11.08
                                                                    -------    -------   -------    -------     -------      -------
INVESTMENT OPERATIONS
  Net Investment Income . . . . . . . . . . . . . . . . .              .20        .40       .44        .47         .49          .43
  Net Realized and Unrealized Gain
      (Loss) on Investments . . . . . . . . . . . . . . .             (.96)      1.83       .69       3.47        (.83)        3.10
                                                                    -------    -------   -------    -------     -------      -------
         TOTAL FROM INVESTMENT
            OPERATIONS  . . . . . . . . . . . . . . . . .             (.76)      2.23      1.13       3.94        (.34)        3.53
- - ------------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . . . . .             (.15)      (.39)     (.44)      (.47)       (.47)        (.47)
  Distributions from Realized Capital Gains . . . . . . .             (.40)     (1.69)     (.71)      (.44)       (.04)          --
                                                                    -------    -------   -------    -------     -------      -------
         TOTAL DISTRIBUTIONS  . . . . . . . . . . . . . .             (.55)     (2.08)    (1.15)      (.91)       (.51)        (.47)
- - ------------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD  . . . . . . . . . . . . .           $15.14     $16.45    $16.30     $16.32      $13.29       $14.14
====================================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . . . . . . .           -4.77%    +13.83%    +7.01%    +30.29%      -2.44%      +32.00%
- - ------------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- - ------------------------
Net Assets, End of Period (Millions)  . . . . . . . . . .             $547       $531      $416       $335        $211         $175
Ratio of Expenses to Average Net Assets . . . . . . . . .            .51%*       .50%      .40%       .43%        .48%         .53%
Ratio of Net Investment Income to
   Average Net Assets . . . . . . . . . . . . . . . . . .           2.50%*      2.22%     2.67%      2.95%       3.34%        3.35%
Portfolio Turnover Rate . . . . . . . . . . . . . . . . .             65%*        85%       51%        61%         81%          78%
- - ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.





                                       12
<PAGE>   13
NOTES TO FINANCIAL STATEMENTS

Vanguard Quantitative Portfolios is registered under the Investment Company Act
of 1940 as a diversified open-end investment company.

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

1. SECURITY VALUATION: Securities listed on an exchange are valued at the
latest quoted sales prices as of 4:00 PM on the valuation date; securities
not traded are valued at the mean of the latest quoted bid and asked prices.
Securities not listed are valued at the latest quoted bid prices. Temporary
cash investments are valued at amortized cost which approximates market 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. EQUALIZATION: The Fund follows the accounting practice known as
"equalization," under which a portion of the price of capital shares issued
and redeemed, equivalent to undistributed net investment income per share on
the date of the transaction, is credited or charged to undistributed income.
As a result, undistributed income per share is unaffected by Fund share sales 
or redemptions.

4. REPURCHASE AGREEMENTS: The Fund, along with other members of The Vanguard
Group of Investment Companies, transfers uninvested cash balances into a Pooled 
Cash Account, the daily aggregate of which is invested in repurchase
agreements secured by U.S.  Government obligations. Securities pledged as
collateral for repurchase agreements are held by the Fund's custodian bank 
until maturity of each repurchase agreement. Provisions of each agreement 
ensure that the market value of this collateral is sufficient in the event of 
default; however, in the event of default or bankruptcy by the other party  to 
the agreement, realization and/or retention of the collateral may be subject to 
legal proceedings.

5. FUTURES: The Fund utilizes futures contracts to a limited extent. The
primary risks associated with the use of futures contracts are imperfect
correlation between the change in market value of the securities held by the
Fund and the prices of futures contracts, and the possibility of an illiquid
market. Futures contracts are valued based upon their quoted daily settlement 
prices. Fluctuations in the value of futures contracts are recorded as 
unrealized appreciation (depreciation) until terminated, at which time 
realized gains  (losses) are recognized. Unrealized appreciation (depreciation) 
related to open futures contracts is required to be treated as realized gain 
(loss) for Federal income tax purposes.

6. OTHER: Security transactions are accounted for on the date the securities
are purchased or sold. Costs used in determining realized gains and losses
on the sale of investment securities are those of specific securities sold.
Dividend income and distributions to shareholders are recorded on the 
ex-dividend date.

* B.  Under the terms of a contract which expires September 30, 1994, the Fund
pays Franklin Portfolio Associates a basic advisory fee calculated at an annual
percentage rate of average net assets. The basic fee thus computed is subject
to quarterly adjustments based on performance relative to the Standard & Poor's
500 Stock Index. For the six months ended June 30, 1994, the advisory fee
represented an effective annual rate of .20% of 1% of average net assets. No
adjustments were required based on performance.





                                       13
<PAGE>   14
NOTES TO FINANCIAL STATEMENTS (continued)

* C.  The Vanguard Group, Inc. 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 Directors. At
June 30, 1994, the Fund had contributed capital of $89,000 to Vanguard
(included in Other Assets), representing .4% of Vanguard's capitalization. The
Fund's directors and officers are also directors and officers of Vanguard.

* D.  During the six months ended June 30, 1994, the Fund made purchases of
$208,111,000 and sales of $172,209,000 of investment securities other than U.S.
Government securities and temporary cash investments.

* E.  At June 30, 1994, unrealized appreciation of investment securities for
financial reporting and Federal income tax purposes aggregated $14,079,000, of
which $41,060,000 related to appreciated securities and $26,981,000 related to
depreciated securities.

At June 30, 1994, the aggregate settlement value of open Standard & Poor's 500
Index futures contracts expiring in September 1994, the related unrealized
depreciation, and the market value of securities deposited as initial margin
for those contracts were $17,802,000, $782,000, and $843,000, respectively.





                                       14
<PAGE>   15
DIRECTORS AND OFFICERS

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

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

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

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

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

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

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

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

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

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


OTHER FUND OFFICERS

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

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

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

OTHER VANGUARD GROUP OFFICERS

JEREMY G. DUFFIELD
Senior Vice President
Planning & Development

JAMES H. GATELY
Senior Vice President
Institutional

IAN A. MACKINNON
Senior Vice President
Fixed Income Group

VINCENT S. MCCORMACK
Senior Vice President
Operations

RALPH K. PACKARD
Senior Vice President
Chief Financial Officer





                                       15
<PAGE>   16
                          THE VANGUARD FAMILY OF FUNDS

                               MONEY MARKET FUNDS
                         Vanguard Money Market Reserves

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

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

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

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

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

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

                            AGGRESSIVE GROWTH FUNDS
                             Vanguard Explorer Fund
                        Vanguard Specialized Portfolios

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

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

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

                                   Q932-06/94

                                    VANGUARD
                            QUANTITATIVE PORTFOLIOS


                      [FLAG PHOTO - SEE EDGAR APPENDIX]
                              SEMI-ANNUAL REPORT
                                JUNE 30, 1994





<PAGE>   17
                                EDGAR APPENDIX

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



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