WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
[TYPE] EX-27
[DESCRIPTION] FDS JANUS ASPEN GROWTH PORT. INST.
[TEXT]
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated June 30, 2000 included in the Portfolio's Semiannual Report
and is qualified in its entirety by reference to such financial statements.
</LEGEND>
<CIK> 0000906185
<NAME> JANUS ASPEN GROWTH PORT. INST.
<SERIES>
<NUMBER> 101
<NAME> JANUS ASPEN GROWTH PORT. INST.
<MULTIPLIER> 1,000
<CURRENCY> U.S. Dollars
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 3,318,184
<INVESTMENTS-AT-VALUE> 4,133,321
<RECEIVABLES> 39,402
<ASSETS-OTHER> 1,473
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 4,174,196
<PAYABLE-FOR-SECURITIES> 67,056
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,220
<TOTAL-LIABILITIES> 71,276
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3,150,734
<SHARES-COMMON-STOCK> 118,891
<SHARES-COMMON-PRIOR> 87,457
<ACCUMULATED-NII-CURRENT> 1,732
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 134,775
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 815,679
<NET-ASSETS> 3,910,688
<DIVIDEND-INCOME> 5,264
<INTEREST-INCOME> 10,216
<OTHER-INCOME> 0
<EXPENSES-NET> 12,329
<NET-INVESTMENT-INCOME> 3,151
<REALIZED-GAINS-CURRENT> 134,994
<APPREC-INCREASE-CURRENT> (88,520)
<NET-CHANGE-FROM-OPS> 49,625
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2,283)
<DISTRIBUTIONS-OF-GAINS> (155,582)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 29,976
<NUMBER-OF-SHARES-REDEEMED> (3,193)
<SHARES-REINVESTED> 4,651
<NET-CHANGE-IN-ASSETS> 1,100,937
<ACCUMULATED-NII-PRIOR> 864
<ACCUMULATED-GAINS-PRIOR> 155,363
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 11,673
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 12,353
<AVERAGE-NET-ASSETS> 3,492,998
<PER-SHARE-NAV-BEGIN> 33.650
<PER-SHARE-NII> 0.030
<PER-SHARE-GAIN-APPREC> 0.530
<PER-SHARE-DIVIDEND> (0.020)
<PER-SHARE-DISTRIBUTIONS> (1.300)
<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 32.890
<EXPENSE-RATIO> 0.670
</TABLE>
