<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000932471
<NAME> VANGUARD HORIZON FUNDS
<SERIES>
<NUMBER> 01
<NAME> VANGUARD AGGRESSIVE GROWTH FUND
<MULTIPLIER> 1000
<CURRENCY> US
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-START> NOV-01-1999
<PERIOD-END> APR-30-2000
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 645884
<INVESTMENTS-AT-VALUE> 699951
<RECEIVABLES> 984
<ASSETS-OTHER> 126
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 701061
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 15813
<TOTAL-LIABILITIES> 15813
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 543242
<SHARES-COMMON-STOCK> 39350
<SHARES-COMMON-PRIOR> 35648
<ACCUMULATED-NII-CURRENT> 1635
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 86466
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 53905
<NET-ASSETS> 685248
<DIVIDEND-INCOME> 4282
<INTEREST-INCOME> 952
<OTHER-INCOME> 122
<EXPENSES-NET> 1385
<NET-INVESTMENT-INCOME> 3971
<REALIZED-GAINS-CURRENT> 87800
<APPREC-INCREASE-CURRENT> (8356)
<NET-CHANGE-FROM-OPS> 83415
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 5748
<DISTRIBUTIONS-OF-GAINS> 13293
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6725
<NUMBER-OF-SHARES-REDEEMED> 4192
<SHARES-REINVESTED> 1169
<NET-CHANGE-IN-ASSETS> 124515
<ACCUMULATED-NII-PRIOR> 3412
<ACCUMULATED-GAINS-PRIOR> 11959
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 238
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1391
<AVERAGE-NET-ASSETS> 616434
<PER-SHARE-NAV-BEGIN> 15.73
<PER-SHARE-NII> 0.10
<PER-SHARE-GAIN-APPREC> 2.11
<PER-SHARE-DIVIDEND> 0.16
<PER-SHARE-DISTRIBUTIONS> 0.37
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 17.41
<EXPENSE-RATIO> 0.45
</TABLE>
