<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
registrant's unaudited consolidated financial statements as of June 30, 2000 and
the three months then ended, and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<CIK> 0001093434
<NAME> AETHER SYSTEMS, INC.
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 1,240,148
<SECURITIES> 2,383
<RECEIVABLES> 7,808
<ALLOWANCES> 293
<INVENTORY> 2,188
<CURRENT-ASSETS> 1,262,415
<PP&E> 16,583
<DEPRECIATION> 2,885
<TOTAL-ASSETS> 2,703,242
<CURRENT-LIABILITIES> 49,745
<BONDS> 0
0
0
<COMMON> 551
<OTHER-SE> 0
<TOTAL-LIABILITY-AND-EQUITY> 2,703,242
<SALES> 16,156
<TOTAL-REVENUES> 16,156
<CGS> 0
<TOTAL-COSTS> 8,651
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 5,084
<INCOME-PRETAX> (89,914)
<INCOME-TAX> 0
<INCOME-CONTINUING> (89,914)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (89,914)
<EPS-BASIC> (2.36)
<EPS-DILUTED> (2.36)
</TABLE>