<PAGE> PAGE 1
000 A000000 04/30/1999
000 C000000 0000034066
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 U
001 A000000 VANGUARD EXPLORER FUND
001 B000000 811-1530
001 C000000 6106691000
002 A000000 100 VANGUARD BOULEVARD
002 B000000 MALVERN
002 C000000 PA
002 D010000 19355
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
007 C010200 2
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A000001 WELLINGTON MANAGEMENT COMPANY
008 B000001 A
008 C000001 801-15908
008 D010001 BOSTON
008 D020001 MA
008 D030001 02109
008 A000002 GRANAHAN INVESTMENT MANAGEMENT, INC.
008 B000002 A
008 C000002 801-23705
008 D010002 WALTHAM
008 D020002 MA
008 D030002 02154
008 A000003 CHARTWELL INVESTMENT PARTNERS
008 B000003 A
008 C000003 801-54124
008 D010003 BERWYN
008 D020003 PA
008 D030003 19312
010 A000001 THE VANGUARD GROUP, INC.
<PAGE> PAGE 2
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 PRICEWATERHOUSECOOPERS LLP
013 B010001 PHILADELPHIA
013 B020001 PA
013 B030001 19103
014 A000001 VANGUARD MARKETING CORPORATION
014 B000001 8-21570
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 102
019 C000000 VANGUARDGR
020 A000001 INVESTMENT TECHNOLOGY GROUP, INC.
020 B000001 95-4339369
020 C000001 140
020 A000002 WILLIAM O'NEIL & CO. INCORPORATED
020 B000002 95-2269163
020 C000002 92
020 A000003 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
020 B000003 13-2741729
020 C000003 88
020 A000004 INSTINET CORPORATION
020 B000004 13-3443395
020 C000004 87
020 A000005 D. B. CLEARING SERVICES
020 C000005 61
020 A000006 PAINEWEBBER INCORPORATED
020 B000006 13-2638166
020 C000006 59
020 A000007 JONES & ASSOCIATES, INC.
020 B000007 95-3583143
020 C000007 55
020 A000008 JANEY MORTGOMERY SCOTT INC.
020 B000008 23-0731260
020 C000008 55
020 A000009 AVALON RESEARCH GROUP, INC.
020 B000009 65-0622787
020 C000009 54
<PAGE> PAGE 3
020 A000010 UST SECURITIES CORP.
020 B000010 22-2413670
020 C000010 44
021 000000 1653
022 A000001 THE VANGUARD GROUP, INC./POOLED CASH ACCT.
022 B000001 23-1945930
022 C000001 687983
022 D000001 702537
022 A000002 MORGAN STANLEY & CO., INC.
022 B000002 13-2655998
022 C000002 33433
022 D000002 63357
022 A000003 GOLDMAN, SACHS & CO.
022 B000003 13-5108880
022 C000003 19594
022 D000003 42007
022 A000004 MONTGOMERY SECURITIES
022 B000004 94-1701676
022 C000004 26667
022 D000004 18102
022 A000005 ROBERTSON STEPHENS INVESTMENT MANAGEMENT
022 B000005 13-2518466
022 C000005 11308
022 D000005 27331
022 A000006 LEHMAN BROTHERS INC.
022 B000006 13-2518466
022 C000006 11308
022 D000006 27331
022 A000007 WARBURG DILLION REID LLC
022 B000007 13-3340045
022 C000007 7857
022 D000007 29872
022 A000008 SMITH BARNEY INC.
022 B000008 13-1912900
022 C000008 23269
022 D000008 9636
022 A000009 WHEAT FIRST UNION
022 B000009 54-0796506
022 C000009 17624
022 D000009 14910
022 A000010 BT ALEX BROWN INCORPORATED
022 B000010 13-3311934
022 C000010 16412
022 D000010 13888
023 C000000 1093309
023 D000000 1199102
024 000000 Y
025 A000001 INVESTMENT TECHNOLOGY GROUP, INC.
025 B000001 95-4339369
025 C000001 E
025 D000001 36014
<PAGE> PAGE 4
025 A000002 DELETE
025 D000002 0
025 A000003 DELETE
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 Y
026 H000000 N
027 000000 Y
028 A010000 47995
028 A020000 4
028 A030000 0
028 A040000 74327
028 B010000 52592
028 B020000 21392
028 B030000 0
028 B040000 91803
028 C010000 42969
028 C020000 0
028 C030000 0
028 C040000 100728
028 D010000 38706
028 D020000 10
028 D030000 0
028 D040000 85674
028 E010000 48864
028 E020000 0
028 E030000 0
028 E040000 81602
028 F010000 47670
028 F020000 0
028 F030000 0
028 F040000 76610
028 G010000 278796
028 G020000 21406
028 G030000 0
028 G040000 510744
028 H000000 0
029 000000 N
030 A000000 0
030 B000000 0.00
<PAGE> PAGE 5
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
034 000000 N
035 000000 0
036 B000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 N
042 A000000 0
042 B000000 0
042 C000000 0
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 0
044 000000 0
045 000000 Y
046 000000 Y
047 000000 N
048 000000 0.000
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
049 000000 N
050 000000 N
051 000000 Y
<PAGE> PAGE 6
052 000000 N
053 A000000 N
054 A000000 N
054 B000000 N
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 N
054 I000000 N
054 J000000 N
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 N
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 3000
062 A000000 N
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 0
063 B000000 0.0
066 A000000 Y
066 B000000 N
066 C000000 Y
066 D000000 N
066 E000000 N
<PAGE> PAGE 7
066 F000000 N
066 G000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 Y
070 B010000 Y
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 Y
070 F020000 Y
070 G010000 Y
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 Y
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 718977
071 B000000 910206
071 C000000 2063850
071 D000000 35
072 A000000 6
072 B000000 5304
072 C000000 8599
072 D000000 0
072 E000000 272
<PAGE> PAGE 8
072 F000000 2747
072 G000000 1159
072 H000000 0
072 I000000 3832
072 J000000 55
072 K000000 0
072 L000000 88
072 M000000 2
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 4
072 S000000 0
072 T000000 234
072 U000000 0
072 V000000 0
072 W000000 0
072 X000000 8121
072 Y000000 107
072 Z000000 6161
072AA000000 330014
072BB000000 138419
072CC010000 128871
072CC020000 0
072DD010000 8697
072DD020000 0
072EE000000 13054
073 A010000 0.2000
073 A020000 0.0000
073 B000000 0.3000
073 C000000 0.0000
074 A000000 315
074 B000000 236935
074 C000000 4467
074 D000000 0
074 E000000 968
074 F000000 2087345
074 G000000 0
074 H000000 0
074 I000000 350
074 J000000 34573
074 K000000 0
074 L000000 6663
074 M000000 0
074 N000000 2371616
074 O000000 46924
074 P000000 1510
074 Q000000 0
074 R010000 0
074 R020000 0
<PAGE> PAGE 9
074 R030000 0
074 R040000 32931
074 S000000 0
074 T000000 2290251
074 U010000 40400
074 U020000 0
074 V010000 56.69
074 V020000 0.00
074 W000000 0.0000
074 X000000 171850
074 Y000000 4467
075 A000000 0
075 B000000 2284694
076 000000 0.00
077 A000000 N
078 000000 N
080 A000000 ICI MUTUAL INSURANCE COMPANY
080 C000000 350000
081 A000000 Y
081 B000000 148
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
SIGNATURE GARY P. SOURA
TITLE MANAGER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<RESTATED>
<CIK> 0000034066
<NAME> VANGUARD EXPLORER FUND
<MULTIPLIER> 1,000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1999
<PERIOD-START> NOV-01-1998
<PERIOD-END> APR-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 1977522
<INVESTMENTS-AT-VALUE> 2329715
<RECEIVABLES> 41236
<ASSETS-OTHER> 665
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2371616
<PAYABLE-FOR-SECURITIES> 46924
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 34441
<TOTAL-LIABILITIES> 81365
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1745316
<SHARES-COMMON-STOCK> 40400
<SHARES-COMMON-PRIOR> 44269
<ACCUMULATED-NII-CURRENT> 3912
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 183186
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 357837
<NET-ASSETS> 2290251
<DIVIDEND-INCOME> 8599
<INTEREST-INCOME> 5304
<OTHER-INCOME> 272
<EXPENSES-NET> 8014
<NET-INVESTMENT-INCOME> 6161
<REALIZED-GAINS-CURRENT> 191595
<APPREC-INCREASE-CURRENT> 128871
<NET-CHANGE-FROM-OPS> 326627
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 8697
<DISTRIBUTIONS-OF-GAINS> 13054
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5201
<NUMBER-OF-SHARES-REDEEMED> 9474
<SHARES-REINVESTED> 404
<NET-CHANGE-IN-ASSETS> 94334
<ACCUMULATED-NII-PRIOR> 6448
<ACCUMULATED-GAINS-PRIOR> 4645
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2747
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 8121
<AVERAGE-NET-ASSETS> 2284694
<PER-SHARE-NAV-BEGIN> 49.60
<PER-SHARE-NII> 0.15
<PER-SHARE-GAIN-APPREC> 7.44
<PER-SHARE-DIVIDEND> 0.20
<PER-SHARE-DISTRIBUTIONS> 0.30
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 56.69
<EXPENSE-RATIO> 0.71
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
