<PAGE> PAGE 1
000 A000000 09/30/99
000 C000000 0000917125
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 RAINIER INVESTMENT MANAGEMENT MUTUAL FUNDS
001 B000000 811-8270
001 C000000 8002486314
002 A000000 601 UNION STREET, SUITE 2801
002 B000000 SEATTLE
002 C000000 WA
002 D010000 98101
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 4
007 C010100 1
007 C020100 SMALL/MID CAP EQUITY PORTFOLIO
007 C030100 N
007 C010200 2
007 C020200 CORE EQUITY PORTFOLIO
007 C030200 N
007 C010300 3
007 C020300 BALANCED PORTFOLIO
007 C030300 N
007 C010400 4
007 C020400 INTERMEDIATE FIXED INCOME PORTFOLIO
007 C030400 N
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A00AA01 RAINIER INVESTMENT MANAGEMENT, INC.
008 B00AA01 A
008 C00AA01 801-35638
008 D01AA01 SEATTLE
008 D02AA01 WA
008 D03AA01 98101
010 A00AA01 INVESTMENT COMPANY ADMINISTRATION, LLC
010 C01AA01 GLENDORA
010 C02AA01 CA
010 C03AA01 91741
011 A00AA01 FIRST FUND DISTRIBUTORS, INC.
<PAGE> PAGE 2
011 B00AA01 8-42809
011 C01AA01 PHOENIX
011 C02AA01 AZ
011 C03AA01 85018
012 A00AA01 FIRSTAR TRUST COMPANY
012 B00AA01 85-0041000
012 C01AA01 MILWAUKEE
012 C02AA01 WI
012 C03AA01 53202
013 A00AA01 KPMG LLP
013 B01AA01 SEATTLE
013 B02AA01 WA
013 B03AA01 98101
015 A00AA01 FIRSTAR TRUST COMPANY
015 B00AA01 C
015 C01AA01 MILWAUKEE
015 C02AA01 WI
015 C03AA01 53202
015 E01AA01 X
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 4
019 C00AA00 RAINIERFDS
020 A000001 MERRILL LYNCH
020 B000001 13-5674085
020 C000001 527
020 A000002 GOLDMAN SACHS
020 B000002 13-5108880
020 C000002 113
020 A000003 LEHMAN BROTHERS, INC.
020 B000003 13-2518466
020 C000003 98
020 A000004 SMITH BARNEY, INC.
020 B000004 13-1912900
020 C000004 62
020 A000005 MORGAN STANLEY & COMPANY
020 B000005 13-2655998
020 C000005 56
020 A000006 BEAR STEARNS
020 B000006 13-3299429
020 C000006 45
020 A000007 SANDERS MORRIS MUNDY
020 B000007 76-0224835
020 C000007 45
020 A000008 DONALDSON LUFKIN JEN/PERSHING
020 B000008 13-2741729
020 C000008 43
020 A000009 CHARLES SCHWAB AND CO., INC.
020 B000009 94-1737782
020 C000009 42
020 A000010 BRIDGE TRADING COMPANY
<PAGE> PAGE 3
020 B000010 43-1450530
020 C000010 42
021 000000 1886
022 A000001 FIRSTAR BANK MONEY CENTER
022 B000001 39-0281225
022 C000001 49600
022 D000001 0
022 A000002 SALOMON BROTHERS
022 B000002 13-3082694
022 C000002 3733
022 D000002 3340
022 A000003 PIPER JAFFRAY
022 B000003 41-0953246
022 C000003 1202
022 D000003 4393
022 A000004 BLACK AND COMPANY
022 B000004 93-0479581
022 C000004 4460
022 D000004 0
022 A000005 JEFFRIES
022 B000005 95-2622900
022 C000005 2071
022 D000005 1729
022 A000006 US BANCORP
022 B000006 93-0908531
022 C000006 326
022 D000006 2292
022 A000007 PACIFIC CREST SECURITIES
022 B000007 93-0625230
022 C000007 0
022 D000007 2592
022 A000008 VECTOR SECURITIES
022 B000008 52-1643524
022 C000008 1240
022 D000008 0
022 A000009 SOUTHWEST SECURITIES, INC.
022 B000009 75-1382137
022 C000009 0
022 D000009 1181
022 A000010 JP MORGAN
022 B000010 13-3224016
022 C000010 0
022 D000010 1059
023 C000000 63684
023 D000000 16743
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
<PAGE> PAGE 4
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 Y
041 00AA00 Y
042 A00AA00 0
042 B00AA00 0
042 C00AA00 0
042 D00AA00 0
042 E00AA00 0
042 F00AA00 0
042 G00AA00 100
042 H00AA00 0
043 00AA00 1814
044 00AA00 0
049 00AA00 N
050 00AA00 N
051 00AA00 N
052 00AA00 N
053 A00AA00 Y
053 B00AA00 Y
053 C00AA00 N
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
<PAGE> PAGE 5
054 O00AA00 N
055 A00AA00 N
055 B00AA00 N
056 00AA00 Y
057 00AA00 N
058 A00AA00 N
059 00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061 00AA00 25000
070 A01AA00 Y
070 A02AA00 N
070 B01AA00 Y
070 B02AA00 N
070 C01AA00 Y
070 C02AA00 N
070 D01AA00 Y
070 D02AA00 N
070 E01AA00 Y
070 E02AA00 N
070 F01AA00 Y
070 F02AA00 N
070 G01AA00 Y
070 G02AA00 N
070 H01AA00 Y
070 H02AA00 N
070 I01AA00 N
070 I02AA00 N
070 J01AA00 Y
070 J02AA00 N
070 K01AA00 Y
070 K02AA00 N
070 L01AA00 Y
070 L02AA00 Y
070 M01AA00 Y
070 M02AA00 N
070 N01AA00 Y
070 N02AA00 N
070 O01AA00 Y
070 O02AA00 N
070 P01AA00 Y
070 P02AA00 N
070 Q01AA00 Y
070 Q02AA00 N
070 R01AA00 Y
070 R02AA00 N
077 A000000 Y
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078 000000 N
<PAGE> PAGE 6
080 C00AA00 0
081 B00AA00 0
082 B00AA00 0
083 B00AA00 0
084 B00AA00 0
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
024 000100 N
028 A010100 9184
028 A020100 0
028 A030100 0
028 A040100 31392
028 B010100 8610
028 B020100 0
028 B030100 0
028 B040100 15777
028 C010100 6257
028 C020100 0
028 C030100 0
028 C040100 16002
028 D010100 5513
028 D020100 0
028 D030100 0
028 D040100 23507
028 E010100 5658
028 E020100 0
028 E030100 0
028 E040100 14252
028 F010100 8920
028 F020100 0
028 F030100 0
028 F040100 9619
028 G010100 44142
028 G020100 0
028 G030100 0
028 G040100 110549
028 H000100 0
045 000100 Y
046 000100 N
047 000100 Y
048 000100 0.850
<PAGE> PAGE 7
048 A010100 0
048 A020100 0.000
048 B010100 0
048 B020100 0.000
048 C010100 0
048 C020100 0.000
048 D010100 0
048 D020100 0.000
048 E010100 0
048 E020100 0.000
048 F010100 0
048 F020100 0.000
048 G010100 0
048 G020100 0.000
048 H010100 0
048 H020100 0.000
048 I010100 0
048 I020100 0.000
048 J010100 0
048 J020100 0.000
048 K010100 0
048 K020100 0.000
062 A000100 N
062 B000100 0.0
062 C000100 0.0
062 D000100 0.0
062 E000100 0.0
062 F000100 0.0
062 G000100 0.0
062 H000100 0.0
062 I000100 0.0
062 J000100 0.0
062 K000100 0.0
062 L000100 0.0
062 M000100 0.0
062 N000100 0.0
062 O000100 0.0
062 P000100 0.0
062 Q000100 0.0
062 R000100 0.0
066 A000100 Y
066 B000100 N
066 C000100 Y
066 D000100 N
066 E000100 N
066 F000100 N
066 G000100 N
067 000100 N
068 A000100 N
068 B000100 N
069 000100 N
<PAGE> PAGE 8
071 A000100 370790
071 B000100 439295
071 C000100 416887
071 D000100 89
072 A000100 6
072 B000100 154
072 C000100 2120
072 D000100 0
072 E000100 0
072 F000100 1813
072 G000100 109
072 H000100 0
072 I000100 21
072 J000100 57
072 K000100 0
072 L000100 23
072 M000100 4
072 N000100 72
072 O000100 0
072 P000100 0
072 Q000100 27
072 R000100 11
072 S000100 3
072 T000100 533
072 U000100 0
072 V000100 0
072 W000100 8
072 X000100 2681
072 Y000100 0
072 Z000100 -407
072AA000100 22694
072BB000100 0
072CC010100 5433
072CC020100 0
072DD010100 0
072DD020100 0
072EE000100 0
073 A010100 0.0000
073 A020100 0.0000
073 B000100 0.0000
073 C000100 0.0000
074 A000100 0
074 B000100 0
074 C000100 2864
074 D000100 0
074 E000100 0
074 F000100 386396
074 G000100 0
074 H000100 0
074 I000100 0
074 J000100 5247
<PAGE> PAGE 9
074 K000100 0
074 L000100 467
074 M000100 53
074 N000100 395027
074 O000100 2289
074 P000100 364
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 522
074 S000100 0
074 T000100 391852
074 U010100 18618
074 U020100 0
074 V010100 21.05
074 V020100 0.00
074 W000100 0.0000
074 X000100 371
074 Y000100 0
075 A000100 0
075 B000100 425602
076 000100 0.00
024 000200 Y
025 A000201 MORGAN STANLEY
025 B000201 13-2655998
025 C000201 E
025 D000201 10774
025 D000202 0
025 D000203 0
025 D000204 0
025 D000205 0
025 D000206 0
025 D000207 0
025 D000208 0
028 A010200 12551
028 A020200 0
028 A030200 0
028 A040200 46946
028 B010200 13448
028 B020200 0
028 B030200 0
028 B040200 19088
028 C010200 24096
028 C020200 0
028 C030200 0
028 C040200 20074
028 D010200 33756
028 D020200 0
028 D030200 0
028 D040200 24097
<PAGE> PAGE 10
028 E010200 17703
028 E020200 0
028 E030200 0
028 E040200 21360
028 F010200 22836
028 F020200 0
028 F030200 0
028 F040200 72126
028 G010200 124390
028 G020200 0
028 G030200 0
028 G040200 203691
028 H000200 0
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.750
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
062 A000200 N
062 B000200 0.0
062 C000200 0.0
062 D000200 0.0
062 E000200 0.0
062 F000200 0.0
062 G000200 0.0
062 H000200 0.0
062 I000200 0.0
062 J000200 0.0
062 K000200 0.0
062 L000200 0.0
<PAGE> PAGE 11
062 M000200 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 0.0
066 A000200 Y
066 B000200 N
066 C000200 Y
066 D000200 N
066 E000200 N
066 F000200 N
066 G000200 N
067 000200 N
068 A000200 N
068 B000200 N
069 000200 N
071 A000200 448810
071 B000200 537731
071 C000200 886080
071 D000200 51
072 A000200 6
072 B000200 432
072 C000200 4631
072 D000200 0
072 E000200 0
072 F000200 3445
072 G000200 183
072 H000200 0
072 I000200 31
072 J000200 111
072 K000200 0
072 L000200 25
072 M000200 6
072 N000200 79
072 O000200 0
072 P000200 0
072 Q000200 40
072 R000200 19
072 S000200 6
072 T000200 1148
072 U000200 0
072 V000200 0
072 W000200 16
072 X000200 5109
072 Y000200 0
072 Z000200 -46
072AA000200 37022
072BB000200 0
072CC010200 0
072CC020200 19119
<PAGE> PAGE 12
072DD010200 0
072DD020200 0
072EE000200 0
073 A010200 0.0000
073 A020200 0.0000
073 B000200 0.0000
073 C000200 0.0000
074 A000200 7
074 B000200 0
074 C000200 20627
074 D000200 0
074 E000200 0
074 F000200 833154
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 1636
074 K000200 0
074 L000200 1179
074 M000200 54
074 N000200 856657
074 O000200 2726
074 P000200 721
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 4093
074 S000200 0
074 T000200 849117
074 U010200 32892
074 U020200 0
074 V010200 25.82
074 V020200 0.00
074 W000200 0.0000
074 X000200 682
074 Y000200 0
075 A000200 0
075 B000200 917163
076 000200 0.00
024 000300 Y
025 A000301 MERRILL LYNCH
025 B000301 13-5674085
025 C000301 D
025 D000301 1003
025 A000302 MORGAN STANLEY
025 B000302 13-2655998
025 C000302 D
025 D000302 707
025 A000303 SMITH BARNEY
025 B000303 13-1912900
<PAGE> PAGE 13
025 C000303 D
025 D000303 1103
025 D000304 0
025 D000305 0
025 D000306 0
025 D000307 0
025 D000308 0
028 A010300 3817
028 A020300 462
028 A030300 0
028 A040300 5277
028 B010300 1331
028 B020300 0
028 B030300 0
028 B040300 2153
028 C010300 655
028 C020300 0
028 C030300 0
028 C040300 2387
028 D010300 1687
028 D020300 370
028 D030300 0
028 D040300 1375
028 E010300 1053
028 E020300 0
028 E030300 0
028 E040300 851
028 F010300 576
028 F020300 0
028 F030300 0
028 F040300 984
028 G010300 9119
028 G020300 832
028 G030300 0
028 G040300 13027
028 H000300 0
045 000300 Y
046 000300 N
047 000300 Y
048 000300 0.700
048 A010300 0
048 A020300 0.000
048 B010300 0
048 B020300 0.000
048 C010300 0
048 C020300 0.000
048 D010300 0
048 D020300 0.000
048 E010300 0
048 E020300 0.000
048 F010300 0
<PAGE> PAGE 14
048 F020300 0.000
048 G010300 0
048 G020300 0.000
048 H010300 0
048 H020300 0.000
048 I010300 0
048 I020300 0.000
048 J010300 0
048 J020300 0.000
048 K010300 0
048 K020300 0.000
062 A000300 N
062 B000300 0.0
062 C000300 0.0
062 D000300 0.0
062 E000300 0.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 0.0
062 M000300 0.0
062 N000300 0.0
062 O000300 0.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
066 A000300 Y
066 B000300 N
066 C000300 N
066 D000300 N
066 E000300 Y
066 F000300 N
066 G000300 N
067 000300 Y
068 A000300 N
068 B000300 N
069 000300 N
071 A000300 32300
071 B000300 37442
071 C000300 93931
071 D000300 34
072 A000300 6
072 B000300 1056
072 C000300 320
072 D000300 0
072 E000300 0
072 F000300 342
072 G000300 49
<PAGE> PAGE 15
072 H000300 0
072 I000300 8
072 J000300 21
072 K000300 0
072 L000300 5
072 M000300 1
072 N000300 13
072 O000300 0
072 P000300 0
072 Q000300 17
072 R000300 4
072 S000300 1
072 T000300 122
072 U000300 0
072 V000300 0
072 W000300 2
072 X000300 586
072 Y000300 5
072 Z000300 795
072AA000300 3023
072BB000300 0
072CC010300 0
072CC020300 2508
072DD010300 784
072DD020300 0
072EE000300 0
073 A010300 0.1400
073 A020300 0.0000
073 B000300 0.0000
073 C000300 0.0000
074 A000300 1
074 B000300 0
074 C000300 3648
074 D000300 32515
074 E000300 0
074 F000300 58134
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 0
074 K000300 0
074 L000300 682
074 M000300 15
074 N000300 94995
074 O000300 178
074 P000300 74
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 433
<PAGE> PAGE 16
074 S000300 0
074 T000300 94310
074 U010300 5619
074 U020300 0
074 V010300 16.78
074 V020300 0.00
074 W000300 0.0000
074 X000300 148
074 Y000300 0
075 A000300 0
075 B000300 97425
076 000300 0.00
024 000400 Y
025 A000401 MERRILL LYNCH
025 B000401 13-5674085
025 C000401 D
025 D000401 362
025 A000402 MORGAN STANLEY
025 B000402 13-2655998
025 C000402 D
025 D000402 698
025 A000403 SMITH BARNEY
025 B000403 13-1912900
025 C000403 D
025 D000403 1003
025 D000404 0
025 D000405 0
025 D000406 0
025 D000407 0
025 D000408 0
028 A010400 810
028 A020400 99
028 A030400 0
028 A040400 286
028 B010400 638
028 B020400 87
028 B030400 0
028 B040400 484
028 C010400 735
028 C020400 84
028 C030400 0
028 C040400 152
028 D010400 577
028 D020400 97
028 D030400 0
028 D040400 359
028 E010400 82
028 E020400 91
028 E030400 0
028 E040400 667
028 F010400 224
<PAGE> PAGE 17
028 F020400 99
028 F030400 0
028 F040400 359
028 G010400 3066
028 G020400 557
028 G030400 0
028 G040400 2307
028 H000400 0
045 000400 Y
046 000400 N
047 000400 Y
048 000400 0.500
048 A010400 0
048 A020400 0.000
048 B010400 0
048 B020400 0.000
048 C010400 0
048 C020400 0.000
048 D010400 0
048 D020400 0.000
048 E010400 0
048 E020400 0.000
048 F010400 0
048 F020400 0.000
048 G010400 0
048 G020400 0.000
048 H010400 0
048 H020400 0.000
048 I010400 0
048 I020400 0.000
048 J010400 0
048 J020400 0.000
048 K010400 0
048 K020400 0.000
062 A000400 Y
062 B000400 0.0
062 C000400 0.0
062 D000400 0.0
062 E000400 0.0
062 F000400 0.0
062 G000400 0.0
062 H000400 0.0
062 I000400 0.0
062 J000400 0.0
062 K000400 0.0
062 L000400 16.7
062 M000400 46.9
062 N000400 0.0
062 O000400 0.0
062 P000400 33.7
062 Q000400 1.8
<PAGE> PAGE 18
062 R000400 0.9
063 A000400 0
063 B000400 3.8
064 A000400 N
064 B000400 N
066 A000400 N
067 000400 N
068 A000400 N
068 B000400 N
069 000400 N
071 A000400 73
071 B000400 875
071 C000400 18254
071 D000400 0
072 A000400 6
072 B000400 617
072 C000400 0
072 D000400 0
072 E000400 0
072 F000400 48
072 G000400 11
072 H000400 0
072 I000400 6
072 J000400 3
072 K000400 0
072 L000400 2
072 M000400 1
072 N000400 10
072 O000400 0
072 P000400 0
072 Q000400 12
072 R000400 4
072 S000400 0
072 T000400 11
072 U000400 0
072 V000400 0
072 W000400 2
072 X000400 110
072 Y000400 51
072 Z000400 558
072AA000400 0
072BB000400 1
072CC010400 0
072CC020400 458
072DD010400 551
072DD020400 0
072EE000400 0
073 A010400 0.3100
073 A020400 0.0000
073 B000400 0.0000
073 C000400 0.0000
<PAGE> PAGE 19
074 A000400 0
074 B000400 0
074 C000400 3546
074 D000400 17520
074 E000400 0
074 F000400 0
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 0
074 K000400 0
074 L000400 333
074 M000400 9
074 N000400 21408
074 O000400 0
074 P000400 1
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 126
074 S000400 0
074 T000400 21281
074 U010400 1775
074 U020400 0
074 V010400 11.99
074 V020400 0.00
074 W000400 0.0000
074 X000400 49
074 Y000400 0
075 A000400 0
075 B000400 21303
076 000400 0.00
SIGNATURE RITA DAM
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917125
<NAME> RAINIER INVESTMENT MANAGEMENT MUTUAL FUNDS
<SERIES>
<NUMBER> 3
<NAME> BALANCED PORTFOLIO
<MULTIPLIER> 1
<CURRENCY> US DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 86245856
<INVESTMENTS-AT-VALUE> 94296765
<RECEIVABLES> 682486
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 15751
<TOTAL-ASSETS> 94995002
<PAYABLE-FOR-SECURITIES> 178343
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 506742
<TOTAL-LIABILITIES> 685085
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 81926206
<SHARES-COMMON-STOCK> 5619485
<SHARES-COMMON-PRIOR> 5799268
<ACCUMULATED-NII-CURRENT> 2851
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4329952
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8050908
<NET-ASSETS> 94309917
<DIVIDEND-INCOME> 319369
<INTEREST-INCOME> 1056386
<OTHER-INCOME> 0
<EXPENSES-NET> 580827
<NET-INVESTMENT-INCOME> 794928
<REALIZED-GAINS-CURRENT> 3022639
<APPREC-INCREASE-CURRENT> (2508486)
<NET-CHANGE-FROM-OPS> 1309082
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 783805
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 529388
<NUMBER-OF-SHARES-REDEEMED> 757934
<SHARES-REINVESTED> 48763
<NET-CHANGE-IN-ASSETS> (2533962)
<ACCUMULATED-NII-PRIOR> (8273)
<ACCUMULATED-GAINS-PRIOR> 1307313
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 341662
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 585528
<AVERAGE-NET-ASSETS> 97424821
<PER-SHARE-NAV-BEGIN> 16.70
<PER-SHARE-NII> 0.14
<PER-SHARE-GAIN-APPREC> 0.08
<PER-SHARE-DIVIDEND> 0.14
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.78
<EXPENSE-RATIO> 1.19
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917125
<NAME> RAINIER INVESTMENT MANAGEMENT MUTUAL FUNDS
<SERIES>
<NUMBER> 2
<NAME> CORE EQUITY PORTFOLIO
<MULTIPLIER> 1
<CURRENCY> US DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 727659634
<INVESTMENTS-AT-VALUE> 853780765
<RECEIVABLES> 2815097
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 60951
<TOTAL-ASSETS> 856656813
<PAYABLE-FOR-SECURITIES> 2725697
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4814555
<TOTAL-LIABILITIES> 7540252
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 671017434
<SHARES-COMMON-STOCK> 32891814
<SHARES-COMMON-PRIOR> 35930533
<ACCUMULATED-NII-CURRENT> 49323
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 51928673
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 126121131
<NET-ASSETS> 849116561
<DIVIDEND-INCOME> 4631137
<INTEREST-INCOME> 432065
<OTHER-INCOME> 0
<EXPENSES-NET> 5108978
<NET-INVESTMENT-INCOME> (45776)
<REALIZED-GAINS-CURRENT> 37022345
<APPREC-INCREASE-CURRENT> (19118906)
<NET-CHANGE-FROM-OPS> 17857663
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4672429
<NUMBER-OF-SHARES-REDEEMED> 7711148
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (61470885)
<ACCUMULATED-NII-PRIOR> 95100
<ACCUMULATED-GAINS-PRIOR> 14906328
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3445232
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 5108978
<AVERAGE-NET-ASSETS> 917163311
<PER-SHARE-NAV-BEGIN> 25.34
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 0.48
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 25.82
<EXPENSE-RATIO> 1.11
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917125
<NAME> RAINIER INVESTMENT MANAGEMENT MUTUAL FUNDS
<SERIES>
<NUMBER> 4
<NAME> INTERMEDIATE FIXED INCOME PORTFOLIO
<MULTIPLIER> 1
<CURRENCY> US DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 21418325
<INVESTMENTS-AT-VALUE> 21065122
<RECEIVABLES> 332505
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 10151
<TOTAL-ASSETS> 21407778
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 126772
<TOTAL-LIABILITIES> 126772
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 21631193
<SHARES-COMMON-STOCK> 1775429
<SHARES-COMMON-PRIOR> 1666530
<ACCUMULATED-NII-CURRENT> 3145
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (129)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (353203)
<NET-ASSETS> 21281006
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 616745
<OTHER-INCOME> 0
<EXPENSES-NET> 58722
<NET-INVESTMENT-INCOME> 558023
<REALIZED-GAINS-CURRENT> (848)
<APPREC-INCREASE-CURRENT> (457644)
<NET-CHANGE-FROM-OPS> 99531
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 551042
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 253965
<NUMBER-OF-SHARES-REDEEMED> 191113
<SHARES-REINVESTED> 46046
<NET-CHANGE-IN-ASSETS> 875854
<ACCUMULATED-NII-PRIOR> (3836)
<ACCUMULATED-GAINS-PRIOR> 719
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 48045
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 109961
<AVERAGE-NET-ASSETS> 21303294
<PER-SHARE-NAV-BEGIN> 12.24
<PER-SHARE-NII> 0.31
<PER-SHARE-GAIN-APPREC> (0.25)
<PER-SHARE-DIVIDEND> 0.31
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.99
<EXPENSE-RATIO> 0.55
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917125
<NAME> RAINIER INVESTMENT MANAGEMENT MUTUAL FUNDS
<SERIES>
<NUMBER> 1
<NAME> SMALL/MID CAP EQUITY PORTFOLIO
<MULTIPLIER> 1
<CURRENCY> US DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 393144241
<INVESTMENTS-AT-VALUE> 389259709
<RECEIVABLES> 5714601
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 52690
<TOTAL-ASSETS> 395027000
<PAYABLE-FOR-SECURITIES> 2289061
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 885654
<TOTAL-LIABILITIES> 3174715
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 402075083
<SHARES-COMMON-STOCK> 18618364
<SHARES-COMMON-PRIOR> 21706014
<ACCUMULATED-NII-CURRENT> (402037)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5936229)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3884532)
<NET-ASSETS> 391852285
<DIVIDEND-INCOME> 2120498
<INTEREST-INCOME> 153976
<OTHER-INCOME> 0
<EXPENSES-NET> 2681669
<NET-INVESTMENT-INCOME> (407195)
<REALIZED-GAINS-CURRENT> 22694383
<APPREC-INCREASE-CURRENT> 5432887
<NET-CHANGE-FROM-OPS> 27720075
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2086164
<NUMBER-OF-SHARES-REDEEMED> 5173814
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (38175265)
<ACCUMULATED-NII-PRIOR> 5158
<ACCUMULATED-GAINS-PRIOR> (28630612)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1812878
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2681669
<AVERAGE-NET-ASSETS> 425601707
<PER-SHARE-NAV-BEGIN> 19.81
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 1.26
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.05
<EXPENSE-RATIO> 1.26
</TABLE>
