VANGUARD/PRIMECAP FUND INC
NSAR-B, 1999-02-16
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<PAGE>      PAGE  1
000 B000000 12/31/98
000 C000000 0000752177
000 D000000 N
000 E000000 NF
000 F000000 Y
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000 J000000 U
001 A000000 VANGUARD PRIMECAP FUND
001 B000000 811-4098
001 C000000 6106691000
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002 B000000 MALVERN
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008 A000001 PRIMECAP MANAGEMENT COMPANY
008 B000001 A
008 C000001 801-19765
008 D010001 PASEDENA
008 D020001 CA
008 D030001 91101
010 A000001 THE VANGUARD GROUP, INC.
010 B000001 801-11953
010 C010001 MALVERN
010 C020001 PA
010 C030001 19355
012 A000001 THE VANGUARD GROUP, INC.
012 B000001 84-772
012 C010001 MALVERN
012 C020001 PA
012 C030001 19355
013 A000001 PRICEWATERHOUSE COOPERS LLP
<PAGE>      PAGE  2
013 B010001 PHILADELPHIA
013 B020001 PA
013 B030001 19103
014 A000001 VANGUARD MARKETING CORPORATION
014 B000001 8-21570
015 A000001 STATE STREET BANK & TRUST CO.
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
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020 A000001 LEHMAN BROTHERS INC.
020 B000001 13-2518466
020 C000001    379
020 A000002 DONALD, LUFKIN, & JENRETTE SECURITIES CORP.
020 B000002 13-2741729
020 C000002    252
020 A000003 MORGAN STANLEY & CO.,INC.
020 B000003 13-2655998
020 C000003    248
020 A000004 MERILL LYNCH PIERCE FENNER & SMITH
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020 C000004    216
020 A000005 GOLDMAN,SACHS & CO.
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020 C000005    206
020 A000006 CREDIT SUISSE FIRST BOSTON CORP.
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020 C000006    197
020 A000007 SALOMON SMITH BARNEY, INC.
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020 A000008 SCHRODER & CO., INC.
020 B000008 13-2697272
020 C000008    155
020 A000009 PAINEWEBBER INC.
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020 C000009    127
020 A000010 CIBC OPPENHEIMER CORP.
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020 C000010    127
021  000000     3541
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022 A000002 MERRILL LYNCH PIERCE FENNER & SMITH
<PAGE>      PAGE  3
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022 A000003 GOLDMAN,SACHS & CO.
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022 B000007 13-1912900
022 C000007     19398
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022 A000008 MONTGOMERY SECURITIES INC.
022 B000008 94-1701676
022 C000008      6161
022 D000008      6983
022 A000009 CIBC OPPENHEIMER CORP.
022 B000009 13-2798343
022 C000009         0
022 D000009      8269
022 A000010 BEAR,STEARNS SECURITIES CORP.
022 B000010 13-3299429
022 C000010      2603
022 D000010      4576
023 C000000    1611667
023 D000000    1853365
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<PAGE>      PAGE  9
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SIGNATURE   GARY P. SOURA                                
TITLE       MANAGER             
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000752177
<NAME> VANGUARD PRIMECAP FUND
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          6768389
<INVESTMENTS-AT-VALUE>                        11242425
<RECEIVABLES>                                    64672
<ASSETS-OTHER>                                    1862
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                11308959
<PAYABLE-FOR-SECURITIES>                          6494
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        92579
<TOTAL-LIABILITIES>                              99073
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       6589740
<SHARES-COMMON-STOCK>                           235210
<SHARES-COMMON-PRIOR>                           206908
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (3059)
<ACCUMULATED-NET-GAINS>                         149169
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       4474036
<NET-ASSETS>                                  11209886
<DIVIDEND-INCOME>                                59285
<INTEREST-INCOME>                                66712
<OTHER-INCOME>                                     748
<EXPENSES-NET>                                   50160
<NET-INVESTMENT-INCOME>                          76585
<REALIZED-GAINS-CURRENT>                        433652
<APPREC-INCREASE-CURRENT>                      1697719
<NET-CHANGE-FROM-OPS>                          2207956
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        80088
<DISTRIBUTIONS-OF-GAINS>                        348822
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          71476
<NUMBER-OF-SHARES-REDEEMED>                      52348
<SHARES-REINVESTED>                               9174
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<ACCUMULATED-NII-PRIOR>                            444
<ACCUMULATED-GAINS-PRIOR>                        64339
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            20669
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  50162
<AVERAGE-NET-ASSETS>                           9824168
<PER-SHARE-NAV-BEGIN>                            39.56
<PER-SHARE-NII>                                   0.34
<PER-SHARE-GAIN-APPREC>                           9.63
<PER-SHARE-DIVIDEND>                              0.35
<PER-SHARE-DISTRIBUTIONS>                         1.52
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              47.66
<EXPENSE-RATIO>                                   0.51
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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