<PAGE> PAGE 1
000 B000000 12/31/1999
000 C000000 0001016073
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 Y
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 DRIEHAUS MUTUAL FUNDS
001 B000000 811-07655
001 C000000 3125873800
002 A000000 25 EAST ERIE STREET
002 B000000 CHICAGO
002 C000000 IL
002 D010000 60611
002 D020000 2703
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 5
007 C010100 1
007 C020100 DRIEHAUS INTERNATIONAL GROWTH FUND
007 C030100 N
007 C010200 2
007 C020200 DRIEHAUS EMERGING MARKETS GROWTH FUND
007 C030200 N
007 C010300 3
007 C020300 DRIEHAUS ASIA PACIFIC GROWTH FUND
007 C030300 N
007 C010400 4
007 C020400 DRIEHAUS EUROPEAN OPPORTUNITY FUND
007 C030400 N
007 C010500 5
007 C020500 DRIEHAUS INTERNATIONAL DISCOVERY FUND
007 C030500 N
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A00AA01 DRIEHAUS CAPITAL MANAGEMENT, INC.
008 B00AA01 A
008 C00AA01 801-18439
008 D01AA01 CHICAGO
008 D02AA01 IL
008 D03AA01 60611
008 D04AA01 2703
010 A00AA01 PFPC INC.
<PAGE> PAGE 2
010 B00AA01 85-1196
010 C01AA01 WILMINGTON
010 C02AA01 DE
010 C03AA01 19809
011 A00AA01 DRIEHAUS SECURITIES CORP.
011 B00AA01 8-24024
011 C01AA01 CHICAGO
011 C02AA01 IL
011 C03AA01 60611
011 C04AA01 2703
012 A00AA01 PFPC INC.
012 B00AA01 85-1196
012 C01AA01 WILMINGTON
012 C02AA01 DE
012 C03AA01 19809
013 A00AA01 ARTHUR ANDERSEN, LLP
013 B01AA01 CHICAGO
013 B02AA01 IL
013 B03AA01 60603
014 A00AA01 DRIEHAUS SECURITIES CORP.
014 B00AA01 8-24024
015 A00AA01 CHASE MANHATTAN BANK
015 B00AA01 C
015 C01AA01 BROOKLYN
015 C02AA01 NY
015 C03AA01 11245
015 E04AA01 X
018 00AA00 Y
019 A00AA00 N
019 B00AA00 0
020 A000001 DRIEHAUS SECURITIES CORP.
020 B000001 36-3026585
020 C000001 390
020 A000002 MERRILL, LYNCH, PIERCE, FENNER & SMITH, INC.
020 B000002 13-5674085
020 C000002 381
020 A000003 KLEINWORT BENSON NORTH AMERICA, INC.
020 B000003 13-2647786
020 C000003 304
020 A000004 ROBERT FLEMING, INC.
020 B000004 13-3298866
020 C000004 300
020 A000005 S. G. WARURG SECURITIES
020 B000005 13-3340045
020 C000005 290
020 A000006 S. G. COWEN CORP.
020 B000006 13-1976032
020 C000006 276
020 A000007 H. G. ASIA/ABN AMRO
020 B000007 13-3227945
020 C000007 249
<PAGE> PAGE 3
020 A000008 GODLMAN SACHS
020 B000008 13-5108880
020 C000008 218
020 A000009 MORGAN STANLEY & CO.
020 B000009 13-2655998
020 C000009 197
020 A000010 NOMURA SECURITIES
020 B000010 13-2642206
020 C000010 180
021 000000 4673
022 A000001 KLEINWORT BENSON NORTH AMERICA, INC.
022 B000001 13-2647786
022 C000001 11492
022 D000001 7980
022 A000002 NOMURA SECURITIES
022 B000002 13-2642206
022 C000002 1049
022 D000002 3845
022 A000003 GOLDMAN SACHS
022 B000003 13-5108880
022 C000003 4045
022 D000003 0
022 A000004 MERRILL, LYNCH, PIERCE, FENNER & SMITH, INC.
022 B000004 13-5674085
022 C000004 1990
022 D000004 463
022 A000005 MORGAN STANLEY & CO.
022 B000005 13-2655998
022 C000005 1563
022 D000005 0
022 A000006 CS FIRST BOSTON
022 B000006 13-9659485
022 C000006 781
022 D000006 712
022 A000007 HG ASIA/ABN AMRO
022 B000007 13-3227945
022 C000007 185
022 D000007 1101
022 A000008 JAMES CAPEL
022 B000008 13-2650272
022 C000008 380
022 D000008 523
022 A000009 ENSKILDA
022 B000009 13-3497509
022 C000009 785
022 D000009 0
022 A000010 SG WARBURG SECURITIES
022 B000010 13-3340045
022 C000010 263
022 D000010 476
023 C000000 25707
<PAGE> PAGE 4
023 D000000 15705
024 00AA00 N
025 D00AA01 0
025 D00AA02 0
025 D00AA03 0
025 D00AA04 0
025 D00AA05 0
025 D00AA06 0
025 D00AA07 0
025 D00AA08 0
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 Y
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
029 00AA00 N
030 A00AA00 0
030 B00AA00 0.00
030 C00AA00 0.00
031 A00AA00 0
031 B00AA00 0
032 00AA00 0
033 00AA00 0
034 00AA00 N
035 00AA00 0
036 B00AA00 0
037 00AA00 N
038 00AA00 0
039 00AA00 N
040 00AA00 N
042 A00AA00 0
042 B00AA00 0
042 C00AA00 0
042 D00AA00 0
042 E00AA00 0
042 F00AA00 0
042 G00AA00 0
042 H00AA00 0
043 00AA00 0
044 00AA00 0
045 00AA00 Y
046 00AA00 N
047 00AA00 Y
048 00AA00 1.500
048 A01AA00 0
048 A02AA00 0.000
<PAGE> PAGE 5
048 B01AA00 0
048 B02AA00 0.000
048 C01AA00 0
048 C02AA00 0.000
048 D01AA00 0
048 D02AA00 0.000
048 E01AA00 0
048 E02AA00 0.000
048 F01AA00 0
048 F02AA00 0.000
048 G01AA00 0
048 G02AA00 0.000
048 H01AA00 0
048 H02AA00 0.000
048 I01AA00 0
048 I02AA00 0.000
048 J01AA00 0
048 J02AA00 0.000
048 K01AA00 0
048 K02AA00 0.000
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 N
054 N00AA00 N
054 O00AA00 Y
062 A00AA00 N
062 B00AA00 0.0
062 C00AA00 0.0
062 D00AA00 0.0
062 E00AA00 0.0
062 F00AA00 0.0
062 G00AA00 0.0
062 H00AA00 0.0
062 I00AA00 0.0
062 J00AA00 0.0
062 K00AA00 0.0
062 L00AA00 0.0
062 M00AA00 0.0
062 N00AA00 0.0
062 O00AA00 0.0
062 P00AA00 0.0
<PAGE> PAGE 6
062 Q00AA00 0.0
062 R00AA00 0.0
063 A00AA00 0
063 B00AA00 0.0
066 A00AA00 Y
066 B00AA00 Y
066 C00AA00 N
066 D00AA00 N
066 E00AA00 N
066 F00AA00 N
066 G00AA00 N
067 00AA00 N
068 A00AA00 N
068 B00AA00 Y
069 00AA00 N
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 A00AA00 RELIANCE INSURANCE COMPANY
080 C00AA00 1000
081 A00AA00 N
081 B00AA00 0
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
<PAGE> PAGE 7
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
028 A010100 8675
028 A020100 0
028 A030100 0
028 A040100 13002
028 B010100 20006
028 B020100 0
028 B030100 0
028 B040100 19178
028 C010100 25128
028 C020100 0
028 C030100 0
028 C040100 18333
028 D010100 31483
028 D020100 0
028 D030100 0
028 D040100 28152
028 E010100 27671
028 E020100 0
028 E030100 0
028 E040100 28589
028 F010100 45009
028 F020100 32422
028 F030100 0
028 F040100 42116
028 G010100 157972
028 G020100 32422
028 G030100 0
028 G040100 149370
028 H000100 0
049 000100 N
050 000100 N
051 000100 N
052 000100 N
053 A000100 N
055 A000100 N
055 B000100 N
056 000100 Y
057 000100 N
058 A000100 N
059 000100 Y
060 A000100 N
060 B000100 N
061 000100 100000
<PAGE> PAGE 8
070 A010100 Y
070 A020100 N
070 B010100 Y
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 Y
070 E020100 N
070 F010100 Y
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 Y
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 Y
070 K020100 Y
070 L010100 Y
070 L020100 Y
070 M010100 Y
070 M020100 Y
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 N
070 P020100 N
070 Q010100 Y
070 Q020100 N
070 R010100 Y
070 R020100 N
071 A000100 730556
071 B000100 746596
071 C000100 266975
071 D000100 274
072 A000100 6
072 B000100 324
072 C000100 1831
072 D000100 0
072 E000100 0
072 F000100 4080
072 G000100 314
072 H000100 0
072 I000100 43
072 J000100 245
072 K000100 0
<PAGE> PAGE 9
072 L000100 35
072 M000100 19
072 N000100 24
072 O000100 0
072 P000100 0
072 Q000100 0
072 R000100 18
072 S000100 100
072 T000100 0
072 U000100 25
072 V000100 0
072 W000100 54
072 X000100 4957
072 Y000100 0
072 Z000100 -2802
072AA000100 135055
072BB000100 46867
072CC010100 150066
072CC020100 0
072DD010100 0
072DD020100 0
072EE000100 0
073 A010100 0.0000
073 A020100 0.0000
073 B000100 1.6049
073 C000100 0.0000
074 A000100 24631
074 B000100 0
074 C000100 0
074 D000100 0
074 E000100 0
074 F000100 440996
074 G000100 0
074 H000100 0
074 I000100 4
074 J000100 790
074 K000100 0
074 L000100 764
074 M000100 72
074 N000100 467257
074 O000100 0
074 P000100 540
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 146
074 S000100 0
074 T000100 466571
074 U010100 22082
074 U020100 0
<PAGE> PAGE 10
074 V010100 21.13
074 V020100 0.00
074 W000100 0.0000
074 X000100 337
074 Y000100 0
075 A000100 0
075 B000100 272029
076 000100 0.00
028 A010200 0
028 A020200 0
028 A030200 0
028 A040200 0
028 B010200 0
028 B020200 0
028 B030200 0
028 B040200 0
028 C010200 450
028 C020200 0
028 C030200 0
028 C040200 0
028 D010200 0
028 D020200 0
028 D030200 0
028 D040200 0
028 E010200 5
028 E020200 0
028 E030200 0
028 E040200 0
028 F010200 130
028 F020200 163
028 F030200 0
028 F040200 520
028 G010200 585
028 G020200 163
028 G030200 0
028 G040200 520
028 H000200 0
049 000200 N
050 000200 N
051 000200 N
052 000200 N
053 A000200 Y
053 B000200 Y
053 C000200 N
055 A000200 Y
055 B000200 N
056 000200 Y
057 000200 N
058 A000200 N
059 000200 Y
060 A000200 N
<PAGE> PAGE 11
060 B000200 N
061 000200 10000
070 A010200 Y
070 A020200 N
070 B010200 Y
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 Y
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 Y
070 I020200 N
070 J010200 Y
070 J020200 Y
070 K010200 Y
070 K020200 Y
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 Y
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 Y
070 Q020200 N
070 R010200 Y
070 R020200 N
071 A000200 22023
071 B000200 21574
071 C000200 5886
071 D000200 367
072 A000200 6
072 B000200 7
072 C000200 68
072 D000200 0
072 E000200 5
072 F000200 93
072 G000200 9
072 H000200 0
072 I000200 5
<PAGE> PAGE 12
072 J000200 69
072 K000200 0
072 L000200 5
072 M000200 4
072 N000200 11
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 16
072 S000200 20
072 T000200 0
072 U000200 6
072 V000200 0
072 W000200 23
072 X000200 261
072 Y000200 101
072 Z000200 -80
072AA000200 3454
072BB000200 1391
072CC010200 3717
072CC020200 0
072DD010200 0
072DD020200 0
072EE000200 0
073 A010200 0.0000
073 A020200 0.0000
073 B000200 0.2793
073 C000200 0.0000
074 A000200 100
074 B000200 0
074 C000200 0
074 D000200 0
074 E000200 485
074 F000200 9403
074 G000200 0
074 H000200 0
074 I000200 334
074 J000200 205
074 K000200 3
074 L000200 21
074 M000200 30
074 N000200 10581
074 O000200 0
074 P000200 0
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 44
074 S000200 0
074 T000200 10537
<PAGE> PAGE 13
074 U010200 574
074 U020200 0
074 V010200 18.36
074 V020200 0.00
074 W000200 0.0000
074 X000200 14
074 Y000200 0
075 A000200 0
075 B000200 6217
076 000200 0.00
028 A010300 30
028 A020300 0
028 A030300 0
028 A040300 0
028 B010300 0
028 B020300 0
028 B030300 0
028 B040300 0
028 C010300 1030
028 C020300 0
028 C030300 0
028 C040300 0
028 D010300 1090
028 D020300 0
028 D030300 0
028 D040300 333
028 E010300 2390
028 E020300 0
028 E030300 0
028 E040300 1732
028 F010300 5999
028 F020300 3257
028 F030300 0
028 F040300 2454
028 G010300 10539
028 G020300 3257
028 G030300 0
028 G040300 4519
028 H000300 0
049 000300 N
050 000300 N
051 000300 N
052 000300 N
053 A000300 Y
053 B000300 Y
053 C000300 N
055 A000300 Y
055 B000300 N
056 000300 Y
057 000300 N
058 A000300 N
<PAGE> PAGE 14
059 000300 Y
060 A000300 N
060 B000300 N
061 000300 10000
070 A010300 Y
070 A020300 N
070 B010300 Y
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 Y
070 D020300 N
070 E010300 Y
070 E020300 N
070 F010300 Y
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 Y
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 Y
070 L010300 Y
070 L020300 Y
070 M010300 Y
070 M020300 Y
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 N
070 P020300 N
070 Q010300 Y
070 Q020300 N
070 R010300 Y
070 R020300 N
071 A000300 45380
071 B000300 40222
071 C000300 11094
071 D000300 363
072 A000300 6
072 B000300 30
072 C000300 55
072 D000300 0
072 E000300 0
072 F000300 175
072 G000300 16
<PAGE> PAGE 15
072 H000300 0
072 I000300 5
072 J000300 46
072 K000300 0
072 L000300 6
072 M000300 4
072 N000300 14
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 16
072 S000300 21
072 T000300 0
072 U000300 6
072 V000300 0
072 W000300 25
072 X000300 334
072 Y000300 30
072 Z000300 -219
072AA000300 10328
072BB000300 1974
072CC010300 9639
072CC020300 0
072DD010300 0
072DD020300 0
072EE000300 0
073 A010300 0.0000
073 A020300 0.0000
073 B000300 4.3341
073 C000300 0.0000
074 A000300 2171
074 B000300 0
074 C000300 0
074 D000300 0
074 E000300 159
074 F000300 27273
074 G000300 0
074 H000300 0
074 I000300 155
074 J000300 0
074 K000300 0
074 L000300 444
074 M000300 29
074 N000300 30231
074 O000300 113
074 P000300 36
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 50
<PAGE> PAGE 16
074 S000300 0
074 T000300 30032
074 U010300 963
074 U020300 0
074 V010300 31.19
074 V020300 0.00
074 W000300 0.0000
074 X000300 32
074 Y000300 0
075 A000300 0
075 B000300 11685
076 000300 0.00
028 A010400 0
028 A020400 0
028 A030400 0
028 A040400 0
028 B010400 0
028 B020400 0
028 B030400 0
028 B040400 0
028 C010400 1011
028 C020400 0
028 C030400 0
028 C040400 0
028 D010400 0
028 D020400 0
028 D030400 0
028 D040400 5
028 E010400 247
028 E020400 0
028 E030400 0
028 E040400 0
028 F010400 5000
028 F020400 0
028 F030400 0
028 F040400 197
028 G010400 6258
028 G020400 0
028 G030400 0
028 G040400 202
028 H000400 0
049 000400 N
050 000400 N
051 000400 N
052 000400 N
053 A000400 Y
053 B000400 Y
053 C000400 N
055 A000400 Y
055 B000400 N
056 000400 Y
<PAGE> PAGE 17
057 000400 N
058 A000400 N
059 000400 Y
060 A000400 N
060 B000400 N
061 000400 10000
070 A010400 Y
070 A020400 N
070 B010400 Y
070 B020400 N
070 C010400 N
070 C020400 N
070 D010400 Y
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 Y
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 Y
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 Y
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 N
070 P020400 N
070 Q010400 Y
070 Q020400 N
070 R010400 Y
070 R020400 N
071 A000400 23753
071 B000400 14912
071 C000400 6939
071 D000400 215
072 A000400 6
072 B000400 12
072 C000400 47
072 D000400 0
072 E000400 0
<PAGE> PAGE 18
072 F000400 107
072 G000400 10
072 H000400 0
072 I000400 5
072 J000400 23
072 K000400 0
072 L000400 9
072 M000400 5
072 N000400 15
072 O000400 0
072 P000400 0
072 Q000400 0
072 R000400 13
072 S000400 23
072 T000400 0
072 U000400 0
072 V000400 0
072 W000400 14
072 X000400 224
072 Y000400 75
072 Z000400 -90
072AA000400 2001
072BB000400 1073
072CC010400 9853
072CC020400 0
072DD010400 0
072DD020400 0
072EE000400 0
073 A010400 0.0000
073 A020400 0.0000
073 B000400 0.0000
073 C000400 0.0000
074 A000400 2348
074 B000400 0
074 C000400 0
074 D000400 0
074 E000400 0
074 F000400 19622
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 74
074 K000400 0
074 L000400 64
074 M000400 10
074 N000400 22118
074 O000400 77
074 P000400 15
074 Q000400 0
074 R010400 0
074 R020400 0
<PAGE> PAGE 19
074 R030400 0
074 R040400 29
074 S000400 0
074 T000400 21997
074 U010400 815
074 U020400 0
074 V010400 26.99
074 V020400 0.00
074 W000400 0.0000
074 X000400 33
074 Y000400 0
075 A000400 0
075 B000400 7188
076 000400 0.00
028 A010500 0
028 A020500 0
028 A030500 0
028 A040500 0
028 B010500 5
028 B020500 0
028 B030500 0
028 B040500 0
028 C010500 66
028 C020500 0
028 C030500 0
028 C040500 0
028 D010500 13
028 D020500 0
028 D030500 0
028 D040500 0
028 E010500 167
028 E020500 0
028 E030500 0
028 E040500 35
028 F010500 5443
028 F020500 1767
028 F030500 0
028 F040500 6
028 G010500 5694
028 G020500 1767
028 G030500 0
028 G040500 41
028 H000500 0
049 000500 N
050 000500 N
051 000500 N
052 000500 N
053 A000500 Y
053 B000500 Y
053 C000500 N
055 A000500 Y
<PAGE> PAGE 20
055 B000500 N
056 000500 Y
057 000500 N
058 A000500 N
059 000500 Y
060 A000500 N
060 B000500 N
061 000500 10000
070 A010500 Y
070 A020500 N
070 B010500 Y
070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 Y
070 D020500 N
070 E010500 Y
070 E020500 N
070 F010500 Y
070 F020500 N
070 G010500 Y
070 G020500 N
070 H010500 Y
070 H020500 N
070 I010500 Y
070 I020500 N
070 J010500 Y
070 J020500 Y
070 K010500 Y
070 K020500 N
070 L010500 Y
070 L020500 Y
070 M010500 Y
070 M020500 Y
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 N
070 P020500 N
070 Q010500 Y
070 Q020500 N
070 R010500 Y
070 R020500 N
071 A000500 33761
071 B000500 24832
071 C000500 9270
071 D000500 268
072 A000500 6
072 B000500 22
072 C000500 59
<PAGE> PAGE 21
072 D000500 0
072 E000500 0
072 F000500 147
072 G000500 14
072 H000500 0
072 I000500 5
072 J000500 44
072 K000500 0
072 L000500 9
072 M000500 5
072 N000500 16
072 O000500 0
072 P000500 0
072 Q000500 0
072 R000500 13
072 S000500 26
072 T000500 0
072 U000500 0
072 V000500 0
072 W000500 17
072 X000500 296
072 Y000500 58
072 Z000500 -157
072AA000500 5454
072BB000500 1582
072CC010500 10580
072CC020500 0
072DD010500 0
072DD020500 0
072EE000500 0
073 A010500 0.0000
073 A020500 0.0000
073 B000500 2.7226
073 C000500 0.0000
074 A000500 3669
074 B000500 0
074 C000500 0
074 D000500 0
074 E000500 171
074 F000500 23196
074 G000500 0
074 H000500 0
074 I000500 13
074 J000500 0
074 K000500 0
074 L000500 64
074 M000500 10
074 N000500 27123
074 O000500 452
074 P000500 29
074 Q000500 0
<PAGE> PAGE 22
074 R010500 0
074 R020500 0
074 R030500 0
074 R040500 400
074 S000500 0
074 T000500 26242
074 U010500 929
074 U020500 0
074 V010500 28.25
074 V020500 0.00
074 W000500 0.0000
074 X000500 155
074 Y000500 0
075 A000500 0
075 B000500 9896
076 000500 0.00
SIGNATURE MARY JANE MALONEY
TITLE MANAGER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001016073
<NAME> DRIEHAUS MUTUAL FUNDS
<SERIES>
<NUMBER> 01
<NAME> DRIEHAUS INTERNATIONAL GROWTH FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 255139085
<INVESTMENTS-AT-VALUE> 440995680
<RECEIVABLES> 1554959
<ASSETS-OTHER> 72011
<OTHER-ITEMS-ASSETS> 24634726
<TOTAL-ASSETS> 467257376
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 685956
<TOTAL-LIABILITIES> 685956
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 240268784
<SHARES-COMMON-STOCK> 22082106
<SHARES-COMMON-PRIOR> 19385212
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 40451133
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 185851503
<NET-ASSETS> 466571420
<DIVIDEND-INCOME> 1831362
<INTEREST-INCOME> 323936
<OTHER-INCOME> 0
<EXPENSES-NET> (4957340)
<NET-INVESTMENT-INCOME> (2802042)
<REALIZED-GAINS-CURRENT> 84464264
<APPREC-INCREASE-CURRENT> 150082012
<NET-CHANGE-FROM-OPS> 231744234
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (32567117)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 17125507
<NUMBER-OF-SHARES-REDEEMED> (16194532)
<SHARES-REINVESTED> 1765919
<NET-CHANGE-IN-ASSETS> 242740206
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (11305657)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4080429
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4957340
<AVERAGE-NET-ASSETS> 272028571
<PER-SHARE-NAV-BEGIN> 11.55
<PER-SHARE-NII> (0.13)
<PER-SHARE-GAIN-APPREC> 11.31
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.60)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.13
<EXPENSE-RATIO> 1.82
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001016073
<NAME> DRIEHAUS MUTUAL FUNDS
<SERIES>
<NUMBER> 02
<NAME> DRIEHAUS EMERGING MARKETS GROWTH FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 5978960
<INVESTMENTS-AT-VALUE> 9921034
<RECEIVABLES> 229319
<ASSETS-OTHER> 29666
<OTHER-ITEMS-ASSETS> 401092
<TOTAL-ASSETS> 10581111
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 44097
<TOTAL-LIABILITIES> 44097
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5684924
<SHARES-COMMON-STOCK> 573826
<SHARES-COMMON-PRIOR> 461247
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 908995
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3943095
<NET-ASSETS> 10537014
<DIVIDEND-INCOME> 68241
<INTEREST-INCOME> 6675
<OTHER-INCOME> 5146
<EXPENSES-NET> (160383)
<NET-INVESTMENT-INCOME> (80321)
<REALIZED-GAINS-CURRENT> 1993735
<APPREC-INCREASE-CURRENT> 3723202
<NET-CHANGE-FROM-OPS> 5636616
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (163210)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 196288
<NUMBER-OF-SHARES-REDEEMED> (94418)
<SHARES-REINVESTED> 10709
<NET-CHANGE-IN-ASSETS> 6508538
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (895433)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 93249
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 397502
<AVERAGE-NET-ASSETS> 6216582
<PER-SHARE-NAV-BEGIN> 8.73
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 10.05
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.28)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.36
<EXPENSE-RATIO> 2.58
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001016073
<NAME> DRIEHAUS MUTUAL FUNDS
<SERIES>
<NUMBER> 03
<NAME> DRIEHAUS ASIA PACIFIC GROWTH FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 17078650
<INVESTMENTS-AT-VALUE> 27586826
<RECEIVABLES> 444450
<ASSETS-OTHER> 28665
<OTHER-ITEMS-ASSETS> 2170782
<TOTAL-ASSETS> 30230723
<PAYABLE-FOR-SECURITIES> 112654
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 86006
<TOTAL-LIABILITIES> 198660
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15327367
<SHARES-COMMON-STOCK> 962741
<SHARES-COMMON-PRIOR> 501412
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4196440
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 10508256
<NET-ASSETS> 30032063
<DIVIDEND-INCOME> 54200
<INTEREST-INCOME> 30201
<OTHER-INCOME> 0
<EXPENSES-NET> (303836)
<NET-INVESTMENT-INCOME> (219435)
<REALIZED-GAINS-CURRENT> 8183304
<APPREC-INCREASE-CURRENT> 9639655
<NET-CHANGE-FROM-OPS> 17603524
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (3257162)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 674329
<NUMBER-OF-SHARES-REDEEMED> (330928)
<SHARES-REINVESTED> 117928
<NET-CHANGE-IN-ASSETS> 25067160
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (706277)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 175273
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 462966
<AVERAGE-NET-ASSETS> 11684833
<PER-SHARE-NAV-BEGIN> 9.90
<PER-SHARE-NII> (0.23)
<PER-SHARE-GAIN-APPREC> 25.85
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (4.33)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 31.19
<EXPENSE-RATIO> 2.60
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001016073
<NAME> DRIEHAUS MUTUAL FUNDS
<SERIES>
<NUMBER> 04
<NAME> DRIEHAUS EUROPEAN OPPORTUNITY FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 9768607
<INVESTMENTS-AT-VALUE> 19622027
<RECEIVABLES> 138450
<ASSETS-OTHER> 9684
<OTHER-ITEMS-ASSETS> 2348388
<TOTAL-ASSETS> 22118549
<PAYABLE-FOR-SECURITIES> 77188
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 44071
<TOTAL-LIABILITIES> 121259
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11335149
<SHARES-COMMON-STOCK> 815124
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 809110
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9853031
<NET-ASSETS> 21997290
<DIVIDEND-INCOME> 47785
<INTEREST-INCOME> 11745
<OTHER-INCOME> 0
<EXPENSES-NET> (149287)
<NET-INVESTMENT-INCOME> (89757)
<REALIZED-GAINS-CURRENT> 898867
<APPREC-INCREASE-CURRENT> 9853031
<NET-CHANGE-FROM-OPS> 10662141
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 822951
<NUMBER-OF-SHARES-REDEEMED> (7828)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 21997280
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 106633
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 359477
<AVERAGE-NET-ASSETS> 7187661
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.11)
<PER-SHARE-GAIN-APPREC> 17.10
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 26.99
<EXPENSE-RATIO> 2.10
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001016073
<NAME> DRIEHAUS MUTUAL FUNDS
<SERIES>
<NUMBER> 05
<NAME> DRIEHAUS INTERNATIONAL DISCOVERY FUND
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 12801138
<INVESTMENTS-AT-VALUE> 23381073
<RECEIVABLES> 63611
<ASSETS-OTHER> 9687
<OTHER-ITEMS-ASSETS> 3669000
<TOTAL-ASSETS> 27123371
<PAYABLE-FOR-SECURITIES> 451963
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 429754
<TOTAL-LIABILITIES> 881717
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13798933
<SHARES-COMMON-STOCK> 928791
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1861174
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 10581547
<NET-ASSETS> 26241654
<DIVIDEND-INCOME> 58788
<INTEREST-INCOME> 22182
<OTHER-INCOME> 0
<EXPENSES-NET> (237664)
<NET-INVESTMENT-INCOME> (156694)
<REALIZED-GAINS-CURRENT> 3784884
<APPREC-INCREASE-CURRENT> 10581547
<NET-CHANGE-FROM-OPS> 14209737
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (1767016)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 858953
<NUMBER-OF-SHARES-REDEEMED> (1731)
<SHARES-REINVESTED> 71568
<NET-CHANGE-IN-ASSETS> 26241644
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 146812
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 427329
<AVERAGE-NET-ASSETS> 9895905
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.17)
<PER-SHARE-GAIN-APPREC> 21.14
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (2.72)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 28.25
<EXPENSE-RATIO> 2.43
</TABLE>
EXHIBIT INDEX
Exhibit A: Attachment to item 77B:
Accountants report on internal control
- -------------------------------------------------------
Exhibit A:
To the Board of Trustees of
Driehaus International Growth Fund,
Driehaus International Discovery Fund,
Driehaus European Opportunities Fund,
Driehaus Asia Pacific Growth Fund, and
Driehaus Emerging Markets Growth Fund:
In planning and performing our audits of DRIEHAUS INTERNATIONAL
GROWTH FUND, DRIEHAUS INTERNATIONAL DISCOVERY FUND, DRIEHAUS
EUROPEAN OPPORTUNITIES FUND, DRIEHAUS ASIA PACIFIC GROWTH FUND,
AND DRIEHAUS EMERGING MARKETS GROWTH FUND (the Funds), for the
year ended December 31, 1999, we considered their internal
control, including control activities for safeguarding
securities, in order to determine our auditing procedures for the
purpose of expressing our opinion on the financial statements and
to comply with the requirements of Form N-SAR, not to provide
assurance on the internal control structure.
The management of the Funds is responsible for establishing and
maintaining internal control. In fulfilling this responsibility,
estimates and judgments by management are required to assess the
expected benefits and related costs of controls. Generally,
controls that are relevant to an audit pertain to the entity's
objective of preparing financial statements for external purposes
that are fairly presented in conformity with generally accepted
accounting principles. Those controls include the safeguarding
of assets against unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, error or
fraud may occur and not be detected. Also, projection of any
evaluation of them to future periods is subject to the risk that
they may become inadequate because of changes in conditions or
that the effectiveness of the design and operation may
deteriorate.
Our consideration of internal control would not necessarily
disclose all matters in internal control that might be material
weaknesses under standards established by the American Institute
of Certified Public Accountants. A material weakness is a
condition in which the design or operation of the specific
internal control components does not reduce to a relatively low
level the risk that misstatements caused by error or fraud in
amounts that would be material in relation to the financial
statements being audited may occur and not be detected within a
timely period by employees in the normal course of performing
their assigned functions. However, we noted no matters involving
internal control and its operation, including controls for
safeguarding securities, that we consider to be material
weaknesses as defined above as of December 31, 1999.
This report is intended solely for the information and use of
management, the Board of Trustees and the Securities and Exchange
Commission.
Arthur Andersen LLP
Chicago, Illinois
February 23, 2000