DRIEHAUS CAPITAL MANAGEMENT INC
13F-HR, 2000-02-11
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<PAGE>   1
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form 13F

                              Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:     December 31, 1999
                                                ---------------------
Check here if Amendment [ ]; Amendment Number:
                                                --------
This Amendment (Check only one.):    [ ] is a restatement.
                                     [ ] adds new holdings entries.
Institutional Investment Manager Filing this Report:

Name:        Driehaus Capital Management, Inc.
           -------------------------------------------------
Address:     25 East Erie Street
           -------------------------------------------------
             Chicago, Illinois 60611
           -------------------------------------------------

           -------------------------------------------------

Form 13F File Number: 28- 3580
                         ------------

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:        Mary H. Weiss
           -------------------------------------------------
Title:       Vice President
           -------------------------------------------------
Phone:       (312) 587-3800
           -------------------------------------------------

Signature, Place, and Date of Signing:

 /s/ Mary H. Weiss               Chicago, Illinois             February 11, 2000
- -----------------------    --------------------------------    -----------------

Report Type (Check only one.):

[X]   13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
      are reported in this report.)

[ ]   13F NOTICE. (Check here if no holdings reported are in this report, and
      all holdings are reported by other reporting manager(s).)




<PAGE>   2

[  ]   13F COMBINATION REPORT. (Check here if a portion of the holdings for
       this reporting manager are reported in this report and a portion are
       reported by other reporting manager(s).)

List of Other Managers Reporting for this Manager:

NONE







<PAGE>   3
                              Form 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers:            NOT APPLICABLE
                                            ------------------
Form 13F Information Table Entry Total:           289
                                            ------------------
Form 13F Information Table Value Total:     $ 4039760
                                            ------------------
                                                (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all
institutional investment managers with respect to which this report is filed,
other than the manager filing this report.

NONE

<PAGE>   4
<TABLE>
<CAPTION>

                                Name of Reporting Manager: Driehaus Capital Management, Inc. ("DCM")
==================================================================================================================

                                                                                               Item 6:
                                                                           Item 5:      Investment Discretion
                                                                           Shares  ===============================
            Item 1:                Item 2:        Item 3:     Item 4:        or
        Name of Issuer          Title of Class     Cusip    Fair Market   Principal           (b) Shared     (c)
                                                   Number      Value       Amount   (a)Sole  -As Defined  Shared -
                                                                                             in Instr. V   Other
==================================================================================================================
<S>                                <C>            <C>         <C>          <C>        <C>     <C>          <C>
ACTV Inc.                          Common         00088E10      8699       190393 X
AES Corporation                    Common         00130H10     14165       189500 X
APAC TeleServices Inc.             Common         00185E10       577        41000 X
ARIBA                              Common         04033V10      3177        17912 X
ARIS Corp.                         Common         04040A10       441        37500 X
ASM Lithography Holding NV         ADR            N0705911     66102       581115 X
Active Software, Inc.              Common         00504E10     18506       201152 X
Actuate Software Corp.             Common         00508B10     10815       252254 X
Advanced Fibre Communication       Common         00754A10      3481        77900 X
Affymetrix Inc.                    Common         00826T10     23942       141093 X
Allaire                            Common         01671410      6606        45150 X
Amdocs Ltd.                        Common         G0260210     13645       395517 X
Amkor Technologies Inc.            Common         03165210      3692       130692 X
Amtech Systems Inc.                Common         03233250       155        31000 X
Analog Devices                     Common         03265410     22523       242184 X
AnswerThink Consulting Group       Common         03691610      4061       118566 X
Applied Micro Circuits Corp.       Common         03822W10     40551       318675 X
ArQule Inc.                        Common         04269E10       390        38000 X
Artisan Components Inc.            Common         04292310       826        40026 X
Artisoft Inc.                      Common         04314L10      3188       177138 X
Aspect Communications Corp.        Common         04523Q10     23584       602790 X
Aspect Development Inc.            Common         04523410     37569       548455 X
Aspen Technology Inc.              Common         04532710       547        20700 X
Asyst Technologies Inc.            Common         04648X10     21021       320629 X
Atmel Corp.                        Common         04951310      4817       162948 X
Audiocodes Ltd.                    ADR            M1534210     52803       573951 X
Audiovox Corp. - Cl. A             Common         05075710     11530       381164 X
Bea Systems Inc                    Common         07332510     28069       401346 X
Blue Wave Systems Inc              Common         09608110      2027       219082 X
Braun's Fashions Corp.             Common         10565810       336        15987 X
Broadcom Corp. -  Cl. A            Common         11132010     16296        59831 X
Broadvision Inc                    Common         11141210     60579       356214 X
Business Objects S. A. Sp ADR      ADR            12328X10     76625       573430 X
C-COR.net Corporation              Common         12501010     41541       542131 X
CDW Computer Centers Inc.          Common         12512910      7829        99573 X
CIMA Labs Inc.                     Common         17179610       131        10000 X
CMG Information Services Inc.      Common         12575010     87011       314262 X
Cabletron Systems                  Common         12692010      2832       108940 X
California Amplifier Inc.          Common         12990010      5461       207556 X
California Micro Devices Corp.     Common         13043910      1551       132000 X
CardioDynamics Intl. Corp.         Common         14159710      3757       683051 X


<CAPTION>
====================================================================================
                                                               (SEC USE ONLY)
====================================================================================

                                                                 Item 8:
                                                        Voting Authority (Shares)
                                                    ================================


                                         Item 7:
                                         Managers
                                       See Instr. V  (a) Sole  (b) Shared  (c) None
====================================================================================
<S>                                     <C>          <C>            <C>        <C>
ACTV Inc.                                              141285           0     49108
AES Corporation                                        140633           0     48867
APAC TeleServices Inc.                                      0           0     41000
ARIBA                                                   12674           0      5238
ARIS Corp.                                                  0           0     37500
ASM Lithography Holding NV                             516766           0     64349
Active Software, Inc.                                  146720           0     54432
Actuate Software Corp.                                 139676           0    112578
Advanced Fibre Communication                                0           0     77900
Affymetrix Inc.                                        104749           0     36344
Allaire                                                 32801           0     12349
Amdocs Ltd.                                            331580           0     63937
Amkor Technologies Inc.                                 96815           0     33877
Amtech Systems Inc.                                         0           0     31000
Analog Devices                                         179481           0     62703
AnswerThink Consulting Group                            65564           0     53002
Applied Micro Circuits Corp.                           236497           0     82178
ArQule Inc.                                                 0           0     38000
Artisan Components Inc.                                 23244           0     16782
Artisoft Inc.                                           10729           0    166409
Aspect Communications Corp.                            334447           0    268343
Aspect Development Inc.                                303390           0    245065
Aspen Technology Inc.                                       0           0     20700
Asyst Technologies Inc.                                173910           0    146719
Atmel Corp.                                            120247           0     42701
Audiocodes Ltd.                                        496370           0     77581
Audiovox Corp. - Cl. A                                 206251           0    174913
Bea Systems Inc                                        297620           0    103726
Blue Wave Systems Inc                                   13433           0    205649
Braun's Fashions Corp.                                      0           0     15987
Broadcom Corp. -  Cl. A                                 44317           0     15514
Broadvision Inc                                        263120           0     93094
Business Objects S. A. Sp ADR                          441761           0    131669
C-COR.net Corporation                                  292895           0    249236
CDW Computer Centers Inc.                               73919           0     25654
CIMA Labs Inc.                                              0           0     10000
CMG Information Services Inc.                          186945           0    127317
Cabletron Systems                                       72167           0     36773
California Amplifier Inc.                               10449           0    197107
California Micro Devices Corp.                              0           0    132000
CardioDynamics Intl. Corp.                             296270           0    386781

</TABLE>


<PAGE>   5
<TABLE>
<CAPTION>

                                Name of Reporting Manager: Driehaus Capital Management, Inc. ("DCM")
- -----------------------------------------------------------------------------------------------------------------------------------

                                                                                                              Item 6:
                                                                                                        Investment Discretion
                                                                                           Item 5:   ------------------------------
                                                                                           Shares
            Item 1:                          Item 2:        Item 3:         Item 4:          or
        Name of Issuer                   Title of Class     Cusip         Fair Market     Principal           (B) Shared     (C)
                                                            Number           Value          Amount   (A)sole  -As Defined  Shared -
                                                                                                              in Instr. V   Other
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>            <C>                 <C>         <C>        <C>      <C>         <C>
Catalysts Semiconductor Inc.                Common         14888110            145          42836X
Celeritek Inc.                              Common         15092610            663          34000X
Celgene Corp.                               Common         15102010          21346         304946X
Cell Genesys Inc.                           Common         15092110           1208          94280X
Cellpoint Inc.                              ADR            15115E10           1048          22300X
Chartered Semiconductor ADR                 ADR            16133R10          16057         219962X
Check Point Software Tech                   ADR            M2246510         113042         568764X
China.com                                   ADR            G2108N10         117181        1490381X
Clarus Corp                                 Common         18270710           1962          29732X
Clickaction Inc.                            Common         18681E10            736          25000X
Cognitronics Corp.                          Common         19243210            211          12500X
Colt Telecom Group - Spons. ADR             ADR            19687710          30432         149176X
CommScope Inc.                              Common         20337210          18157         450402X
Commerce One Inc                            Common         20069310          10635          54123X
Concord Camera Corp.                        Common         20615610           1138          50000X
Concurrent Computer Corp.                   Common         20671020           9019         482622X
Conexant Systems                            Common         20714210          38876         585697X
Corsair Communications Inc.                 Common         22040610            797          98117X
Cree Inc.                                   Common         22544710          43306         507249X
Cubist Pharmaceuticals Inc.                 Common         22967810            693          36000X
Cyber-care Inc                              Common         23243T10            832          91222X
Cytyc Corporation                           Common         23294610          42258         692037X
DII Group Inc.                              Common         23294910           1923          27100X
Datalink Corp.                              Common         23793410            269          13960X
Dataram Corp.                               Common         23810820            561          25000X
Dense-Pac Microsystems Inc.                 Common         24871930           2041         254148X
Diamond Tech. Partners Inc.                 Common         25276210          35233         409985X
Digital Lightwave Inc.                      Common         25385510          91213        1425202X
Digitran Systems Inc.                       Common         25389810             14         273200X
Direct Focus                                Common         25493110            720          25957X
Diversinet Corp                             Common         25536K20            965          43881X
DoubleClick Inc.                            Common         25860930          11860          46866X
Dynamicweb Enterprises                      Common         26806020            184          15000X
E C C S Inc                                 Common         26825H10           4360         345351X
E-tek dynamics Inc.                         Common         26924010          26225         194798X
EchoStar Communications - A                 Common         27876210          25710         263692X
Eidos Plc Adr                               ADR            28248510           3492          42075X
El Sitio                                    ADR            G3017710           2035          55361X
Elantec Semiconductor                       Common         28415510           1126          34122X
Emmis Broadcasting Cl A                     Common         29152510          33319         267317X
Emulex Corp.                                Common         29247520         110765         984575X
Entercom Communications Corp.               Common         29363910           5349          80744X
Enzon Inc.                                  Common         29390410           9120         210254X
Equant N V - NY Reg Shr                     ADR            29440910          14840         132500X
Ericsson (L.M.) Tel Co-Spons ADR            ADR            29482140          13371         203553X
Esoft Inc                                   Common         29690410           2735          93903X
Euroweb Intl Corp                           Common         29880110            405          35000X
Evolving Systems Inc.                       Common         30049R10            160          18843X
Exabyte Corporation                         Common         30061510            492          65571X
Exar Corp.                                  Common         30064510           1827          31026X

<CAPTION>

- ---------------------------------------------------------------------------------------------------
                                                                   (SEC USE ONLY)
- ---------------------------------------------------------------------------------------------------

                                                                  Item 8:
                                                                Voting Authority (Shares)
                                                    ----------------------------------------------

                                            Item 7:
                                           Managers
                                          See Instr. V      (A) Sole       (B) Shared    (C) None
- ---------------------------------------------------------------------------------------------------
<S>                                      <C>                <C>            <C>           <C>
Catalysts Semiconductor Inc.                                      0              0          42836
Celeritek Inc.                                                    0              0          34000
Celgene Corp.                                                160476              0         144470
Cell Genesys Inc.                                              8594              0          85686
Cellpoint Inc.                                                    0              0          22300
Chartered Semiconductor ADR                                  193876              0          26086
Check Point Software Tech                                    465284              0         103480
China.com                                                   1062876              0         427505
Clarus Corp                                                    2651              0          27081
Clickaction Inc.                                                  0              0          25000
Cognitronics Corp.                                                0              0          12500
Colt Telecom Group - Spons. ADR                              131784              0          17392
CommScope Inc.                                               334718              0         115684
Commerce One Inc                                              39927              0          14196
Concord Camera Corp.                                              0              0          50000
Concurrent Computer Corp.                                    208796              0         273826
Conexant Systems                                             433679              0         152018
Corsair Communications Inc.                                   30208              0          67909
Cree Inc.                                                    261615              0         245634
Cubist Pharmaceuticals Inc.                                    3291              0          32709
Cyber-care Inc                                                 8322              0          82900
Cytyc Corporation                                            375234              0         316803
DII Group Inc.                                                    0              0          27100
Datalink Corp.                                                    0              0          13960
Dataram Corp.                                                     0              0          25000
Dense-Pac Microsystems Inc.                                   17613              0         236535
Diamond Tech. Partners Inc.                                  227334              0         182651
Digital Lightwave Inc.                                       738420              0         686782
Digitran Systems Inc.                                         50000              0         223200
Direct Focus                                                  15074              0          10883
Diversinet Corp                                               25469              0          18412
DoubleClick Inc.                                              34666              0          12200
Dynamicweb Enterprises                                            0              0          15000
E C C S Inc                                                   75064              0         270287
E-tek dynamics Inc.                                          143870              0          50928
EchoStar Communications - A                                  195401              0          68291
Eidos Plc Adr                                                 38126              0           3949
El Sitio                                                      33529              0          21832
Elantec Semiconductor                                             0              0          34122
Emmis Broadcasting Cl A                                      198789              0          68528
Emulex Corp.                                                 477036              0         507539
Entercom Communications Corp.                                 44856              0          35888
Enzon Inc.                                                   116255              0          93999
Equant N V - NY Reg Shr                                      128629              0           3871
Ericsson (L.M.) Tel Co-Spons ADRADR                          177714              0          25839
Esoft Inc                                                      7977              0          85926
Euroweb Intl Corp                                              8000              0          27000
Evolving Systems Inc.                                             0              0          18843
Exabyte Corporation                                               0              0          65571
Exar Corp.                                                     7999              0          23027


</TABLE>














<PAGE>   6
<TABLE>
<CAPTION>
                                             Name of Reporting Manager: Driehaus Capital Management, Inc. ("DCM")
====================================================================================================================================
                                                                                Item 5                       Item 6:
                                                                                Shares                Investment Discretion
            Item 1:                    Item 2:       Item 3:      Item 4:         or       =========================================
        Name of Issuer              Title of Class    CUSIP     Fair Market    Principal               (b) Shared         (c)
                                                      Number      Value         Amount      (a)Sole     -As Defined       Shared -
                                                                                                         in Instr. V       Other
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>          <C>          <C>         <C>            <C>         <C>                <C>
Exodus Communications Inc.             Common       30208810        9727       109528 X
Extended Systems Inc.                  Common       30197310        1541        32189 X
Firstcom Corp                          Common       33763T10       41018      1116147 X
Flextronics Intl Ltd                   Common       Y2573F10       17006       369689 X
Forest Laboratories Inc.               Common       34583810       16151       262890 X
Gemstar Intl                           Common       G3788V10       28519       400260 X
Genelabs Technologies                  Common       36870610         165        30000 X
Genentech                              Common       36871040       10027        74548 X
Genome Therapeutics Corp               Common       37243010        1037        64300 X
Genset - Spons Adr                     ADR          37244T10         400        21000 X
Gentner Communications Corp            Common       37245J10         165        11800 X
Genzyme Corp. - Genl. Division         Common       37291710       11142       247604 X
Geoworks Corporation                   Common       37369210        2618       156320 X
Glenayre Tech Inc                      Common       37789910         690        60999 X
Global Datatel Inc                     Common       37934G10          11        10000 X
Global Telesystems Group               Common       37936U10       13591       392511 X
Globalnet Financial.com                Common       37937R20         766        26600 X
Globo Cabo SA Spons ADR                ADR          37957X10         617        34300 X
Golden Telecom Inc.                    ADR          38122G10         391        12225 X
Grupo Televisa SA - Spons GDR          ADR          40049J20       31204       457204 X
Harmonic Lightwaves Inc.               Common       41316010        5491        57842 X
Harris & Harris Group Inc.             Common       41383310         230        20000 X
Hot Topic Inc.                         Common       44133910       21756       935737 X
Human Genome Sciences Inc.             Common       44490310       13806        90454 X
Hyseq Inc.                             Common       44916330        1439        84655 X
I Two Technologies                     Common       46575410       32608       167219 X
IMAGEX.COM                             Common       45244D10         826        19723 X
IONA Technologies                      Common       46206P10         654        11997 X
Inamed Corp.                           Common       45323510        1341        30574 X
Incyte Pharmaceuticals Inc             Common       45337C10        6750       112500 X
Infinity Broadcasting Corp-A           Common       45662S10        2069        57175 X
Infospace.com                          Common       45678T10       25409       118735 X
Inso Corporation                       Common       45767410        3541       109794 X
Integrated Device Technology Inc       Common       45811810       12993       448027 X
Intelect Communications Inc.           Common       45814410         138       100000 X
Intelligroup Inc                       Common       45816A10         350        14161 X
Interleaf, Inc.                        Common       45872920        2403        71477 X
Internet Capital Group                 Common       46059C10       25878       152224 X
Internet Initiative Japan ADR          ADR          46059T10       31365       322729 X
Intranet Solutions Inc                 Common       46093930        3776       102059 X
Ion Networks Inc.                      Common       46205P10        3233       144505 X
Iridex Corp                            Common       46268410         129        15000 X
Isle of Capri Casinos                  Common       46459210         535        40552 X
JDS Uniphase Corp                      Common       46612J10       70920       439645 X
Kulicke & Soffa Industries             Common       50124210         881        20700 X
Lamar Advertising Co                   Common       51281510         933        15400 X
Level 8 Systems Inc.                   Common       52729M10         765        22125 X
Liberty Digital Inc                    Common       53043610       24408       328725 X
Lightbridge Inc                        Common       53222610        1702        61319 X
Lightpath Tech Inc                     Common       53225710        1442        77152 X
<CAPTION>
=========================================================================================
                                                                    (SEC USE ONLY)
=========================================================================================
                                                                      Item 8:
                                                             Voting Authority (Shares)
                                                         ================================
                                             Item 7:
                                            Managers
                                           See Instr. V  (a) Sole   (b) Shared   (c) None
=========================================================================================
<S>                                       <C>            <C>         <C>         <C>
Exodus Communications Inc.                                  81290            0      28238
Extended Systems Inc.                                        7829            0      24360
Firstcom Corp                                              991570            0     124577
Flextronics Intl Ltd                                       274191            0      95498
Forest Laboratories Inc.                                   194984            0      67906
Gemstar Intl                                               258064            0     142196
Genelabs Technologies                                           0            0      30000
Genentech                                                   55335            0      19213
Genome Therapeutics Corp                                        0            0      64300
Genset - Spons Adr                                              0            0      21000
Gentner Communications Corp                                     0            0      11800
Genzyme Corp. - Genl. Division                             183812            0      63792
Geoworks Corporation                                         8940            0     147380
Glenayre Tech Inc                                               0            0      60999
Global Datatel Inc                                              0            0      10000
Global Telesystems Group                                   347085            0      45426
Globalnet Financial.com                                     15460            0      11140
Globo Cabo SA Spons ADR                                     34300            0          0
Golden Telecom Inc.                                          6225            0       6000
Grupo Televisa SA - Spons GDR                              402683            0      54521
Harmonic Lightwaves Inc.                                        2            0      57840
Harris & Harris Group Inc.                                      0            0      20000
Hot Topic Inc.                                             521633            0     414104
Human Genome Sciences Inc.                                  67227            0      23227
Hyseq Inc.                                                   4490            0      80165
I Two Technologies                                         124064            0      43155
IMAGEX.COM                                                   1794            0      17929
IONA Technologies                                               0            0      11997
Inamed Corp.                                                16972            0      13602
Incyte Pharmaceuticals Inc                                  83489            0      29011
Infinity Broadcasting Corp-A                                    0            0      57175
Infospace.com                                               88190            0      30545
Inso Corporation                                             8147            0     101647
Integrated Device Technology IncCommon                     331348            0     116679
Intelect Communications Inc.                                    0            0     100000
Intelligroup Inc                                                0            0      14161
Interleaf, Inc.                                              5982            0      65495
Internet Capital Group                                     111675            0      40549
Internet Initiative Japan ADR                              293136            0      29593
Intranet Solutions Inc                                       9092            0      92967
Ion Networks Inc.                                            8705            0     135800
Iridex Corp                                                     0            0      15000
Isle of Capri Casinos                                           0            0      40552
JDS Uniphase Corp                                          326332            0     113313
Kulicke & Soffa Industries                                  11109            0       9591
Lamar Advertising Co                                            0            0      15400
Level 8 Systems Inc.                                         9937            0      12188
Liberty Digital Inc                                        244052            0      84673
Lightbridge Inc                                             33899            0      27420
Lightpath Tech Inc                                              0            0      77152
</TABLE>

<PAGE>   7
<TABLE>
<CAPTION>
                                             Name of Reporting Manager: Driehaus Capital Management, Inc. ("DCM")
====================================================================================================================================
                                                                                Item 5                       Item 6:
                                                                                Shares                Investment Discretion
            Item 1:                    Item 2:       Item 3:      Item 4:         or       =========================================
        Name of Issuer              Title of Class    CUSIP     Fair Market    Principal                 (b) Shared         (c)
                                                      Number      Value         Amount      (a)Sole     -As Defined        Shared -
                                                                                                        in Instr. V         Other
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>          <C>           <C>         <C>            <C>         <C>                <C>
Lucent Technologies                     Common       54946310         4295       57262 X
Lynx Therapeutics Inc                   Common       55181230          817       25229 X
M R V Communications                    Common       55347710       111420     1772095 X
M Systems Flsh Dsk Pionr                ADR          M7061C10         4398      133782 X
M T I Technology Corp                   Common       55390310         8919      241875 X
MYWEB INC                               Common       62845110         3335      123524 X
Macromedia Inc.                         Common       55610010        34031      465381 X
Macrovision Corp                        Common       55590410        34925      471964 X
Magic Software                          ADR          55916610        16170      260804 X
Manugistics Group Inc.                  Common       56501110          840       26000 X
MedImmune Inc.                          Common       58469910        15134       91239 X
Medarex Inc.                            Common       58391610         2370       63620 X
Mercury Computer System                 Common       58937810          927       26486 X
Mercury Interactive Corp                Common       58940510        42849      396977 X
Microchip Technology Inc                Common       59501710        24303      355113 X
Microtest                               Common       59494110         1846      205131 X
Mih Ltd Tort Shs A                      Common       G6116R10        11624      197011 X
Millenium Pharmaceutic                  Common       59990210        28871      236646 X
Monmouth REIT - Cl. A                   Common       60972010          230       47800 X
Mustang.com Inc.                        Common       62818810          986       63119 X
Myriad Genetics                         Common       62855J10         2949       64107 X
N I I Norsat Intl Inc                   Common       65651210         2052      134532 X
NDS Group PLC -Spons ADR                ADR          62889110          305       10000 X
NTL Incorporated                        Common       62940710        47352      379572 X
NVIDIA                                  Common       67066G10        19495      415333 X
Nabors Industries Inc.                  Common       62956810         9279      299933 X
Nanogen Inc.                            Common       63007510         1495       68335 X
Natural Microsystems Cp                 Common       63888210        33068      706403 X
Netopia Inc                             Common       64114K10         8394      154545 X
Netoptix Corp                           Common       64116F10         3735       55957 X
Netrix Corp.                            Common       64114810         3364      225203 X
Network Appliance Corp                  Common       64120L10        25961      312547 X
Network Peripherals Inc                 Common       64121R10         3104       65684 X
Network Solutions                       Common       64121Q10        19783       90932 X
Newport Corp.                           Common       65182410         7407      161892 X
Nice Systems Limited - Spons ADR        ADR          65365610        27686      562870 X
Nokia Corp Spons ADR                    ADR          65490220        15796       82673 X
Northeast Optic Network                 Common       66433410         1154       18441 X
Novadigm Inc.                           Common       66993710          704       33925 X
Novellus                                Common       67000810        45021      367423 X
Noven Pharmaceuticals                   Common       67000910         1008       55637 X
Numerex Corp                            Common       67053A10          611       49338 X
Obie Media Corp                         Common       67439110         1700      146251 X
On Technology Corp                      Common       68219P10         1615      116410 X
Optibase Ltd                            ADR          M7524R10         3599      102094 X
Optimal Robotics Corp                   Common       68388R20         5729      153787 X
Orbotech Ltd.                           ADR          M7525310        13498      174168 X
Ortel Corp                              Common       68749W10        19110      159249 X
Oxigene Inc                             Common       69182810          253       16174 X
P S W Technologies Inc                  Common       69364J10          610       30587 X
<CAPTION>
=========================================================================================
                                                                    (SEC USE ONLY)
=========================================================================================
                                                                      Item 8:
                                                             Voting Authority (Shares)
                                                         ================================
                                             Item 7:
                                            Managers
                                           See Instr. V  (a) Sole   (b) Shared   (c) None
=========================================================================================
<S>                                       <C>            <C>         <C>         <C>
Lucent Technologies                                             0            0      57262
Lynx Therapeutics Inc                                        2250            0      22979
M R V Communications                                      1111371            0     660724
M Systems Flsh Dsk Pionr                                     7850            0     125932
M T I Technology Corp                                       83740            0     158135
MYWEB INC                                                   52353            0      71171
Macromedia Inc.                                            344618            0     120763
Macrovision Corp                                           241038            0     230926
Magic Software                                             122467            0     138337
Manugistics Group Inc.                                          0            0      26000
MedImmune Inc.                                              67613            0      23626
Medarex Inc.                                                28595            0      35025
Mercury Computer System                                     15354            0      11132
Mercury Interactive Corp                                   293985            0     102992
Microchip Technology Inc                                   263471            0      91642
Microtest                                                   11390            0     193741
Mih Ltd Tort Shs A                                         168143            0      28868
Millenium Pharmaceutic                                     175520            0      61126
Monmouth REIT - Cl. A                                           0            0      47800
Mustang.com Inc.                                                0            0      63119
Myriad Genetics                                             23814            0      40293
N I I Norsat Intl Inc                                       12172            0     122360
NDS Group PLC -Spons ADR                                    10000            0          0
NTL Incorporated                                           309911            0      69661
NVIDIA                                                     230635            0     184698
Nabors Industries Inc.                                     222627            0      77306
Nanogen Inc.                                                 6231            0      62104
Natural Microsystems Cp                                    375068            0     331335
Netopia Inc                                                 85100            0      69445
Netoptix Corp                                               12375            0      43582
Netrix Corp.                                                11777            0     213426
Network Appliance Corp                                     143579            0     168968
Network Peripherals Inc                                      5565            0      60119
Network Solutions                                           67423            0      23509
Newport Corp.                                               38167            0     123725
Nice Systems Limited - Spons ADR                           494230            0      68640
Nokia Corp Spons ADR                                        73642            0       9031
Northeast Optic Network                                      1458            0      16983
Novadigm Inc.                                                2482            0      31443
Novellus                                                   272429            0      94994
Noven Pharmaceuticals                                       19062            0      36575
Numerex Corp                                                    0            0      49338
Obie Media Corp                                                 0            0     146251
On Technology Corp                                           7040            0     109370
Optibase Ltd                                                 8202            0      93892
Optimal Robotics Corp                                       41418            0     112369
Orbotech Ltd.                                              152111            0      22057
Ortel Corp                                                  88043            0      71206
Oxigene Inc                                                     0            0      16174
P S W Technologies Inc                                          0            0      30587
</TABLE>

<PAGE>   8
<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus Capital Management, Inc. ("DCM")
====================================================================================================================================
                                                                                                             Item 6:
                                                                                    Item 5:           Investment Discretion
                                                                                    Shares     =====================================
            Item 1:                       Item 2:        Item 3:      Item 4:         or
        Name of Issuer                Title of Class      Cusip     Fair Market    Principal               (b) Shared       (c)
                                                         Number        Value         Amount     (a)Sole   -As Defined     Shared -
                                                                                                           in Instr. V     Other
====================================================================================================================================
<S>                                   <C>                <C>        <C>            <C>         <C>        <C>             <C>
PC - Tel Inc.                             Common         69325Q10       34354       654358X
PC Connection Inc.                        Common         69318J10        2655        76968X
PE Corp - Celera Genomics Grp             Common         69332S20        3719        24962X
PE Corp-PE Biosystems                     Common         69332S10       33144       275486X
PMC - Sierra Inc.                         Common         69344F10       25949       161865X
Partner Communications - ADR              ADR            70211M10       15406       595404X
Patterson Energy Inc                      Common         70341410         484        37215X
Pegasus Communications                    Common         70590410       13260       135653X
Peregrine Systems Inc                     Common         71366Q10       19064       226446X
Pericom Semiconductor                     Common         71383110         791        30052X
Petroleo Brasileiro S.A. ADR Pfd          ADR            71654V10        7213       281251X
Photon Dynamics Inc                       Common         71936410        2491        64285X
Portal Software                           Common         73612610        6696        65084X
Power Integrations Inc                    Common         73927610        3258        67966X
Powerwave Tech Inc                        Common         73936310        1130        19353X
Precision Optics Corp./Mass               Common         74029410         353        20000X
Precision Response Corp                   Common         74031410         429        17692X
Primus Knowledge Solutions                Common         74163Q10        3761        82995X
Private Bancorp Inc                       Common         74296210        1467       109662X
Provident American Corp.                  Common         74383210        3765       106990X
Proxicom Inc.                             Common         74428210       35071       282118X
Puma Technology Inc                       Common         74588710        4569        34976X
QLT PhotoTherapeutics Inc.                ADR            74692710       39885       678886X
Qlogic Corp                               Common         74727710       53219       332880X
Qualcomm Inc.                             Common         74752510       84364       479000X
RF Micro Devices Inc                      Common         74994110        8253       120596X
Radcom Ltd.                               ADR            M8186510         469        65597X
Radio One Inc.                            Common         75040P10       24793       269494X
Ramtron Intl Inc                          Common         75190730          67        10000X
Rare Medium Group Inc                     Common         75382N10       37371      1095119X
Redback Networks                          Common         75720910        9974        56192X
Remec Inc                                 Common         75954310         306        12000X
ResourcePhoenix.com Inc                   Common         76122L10         198        10000X
Robotic Vision Systems                    Common         77107410        2462       266155X
Rural Cellular Corp                       Common         78190410        1914        21147X
SCIQUEST.COM INC                          Common         80908Q10        5637        70910X
SDL Inc.                                  Common         78407610       21897       100445X
SK Telecom Co Ltd-ADR                     ADR            78440P10       40151      1046277X
Santa Cruz Operation Inc                  Common         80183310        2302        75773X
Sapient Corporation                       Common         80306210       61244       434549X
Satyam Infoway Ltd ADR                    ADR            80409910       64382       415365X
Scient Corp                               Common         80864H10        8415        97355X
Scientific Learning Corp                  Common         80876010         940        25749X
Seibel Systems Inc                        Common         82617010       39384       468862X
Sigma Designs Inc.                        Common         82656510         903        82051X
Silicon Storage Tech                      Common         82705710       43323      1050265X
Socket Communications                     Common         83367210         508        60000X
Sonic Wall                                Common         83547010         813        20203X
Sound Advice Inc.                         Common         83606610         267        21775X
Spanish Broadcasting Sys Cl A             Common         84642588        8387       208385X
<CAPTION>
============================================================================================
                                                                 (SEC USE ONLY)
============================================================================================
                                                                    Item 8:
                                                           Voting Authority (Shares)
                                                    ========================================
                                         Item 7:
                                        Managers
                                      See Instr. V    (a) Sole     (b) Shared     (c) None
============================================================================================
<S>                                   <C>            <C>           <C>            <C>
PC - Tel Inc.                                          363204          0           291154
PC Connection Inc.                                      44671          0            32297
PE Corp - Celera Genomics Grp                           18506          0             6456
PE Corp-PE Biosystems                                  204580          0            70906
PMC - Sierra Inc.                                      119927          0            41938
Partner Communications - ADR                           523727          0            71677
Patterson Energy Inc                                        0          0            37215
Pegasus Communications                                  75266          0            60387
Peregrine Systems Inc                                  167879          0            58567
Pericom Semiconductor                                       0          0            30052
Petroleo Brasileiro S.A. ADR Pfd                       269251          0            12000
Photon Dynamics Inc                                     13474          0            50811
Portal Software                                         48246          0            16838
Power Integrations Inc                                      0          0            67966
Powerwave Tech Inc                                          0          0            19353
Precision Optics Corp./Mass                                 0          0            20000
Precision Response Corp                                     0          0            17692
Primus Knowledge Solutions                              45004          0            37991
Private Bancorp Inc                                         0          0           109662
Provident American Corp.                                59453          0            47537
Proxicom Inc.                                          208432          0            73686
Puma Technology Inc                                      2578          0            32398
QLT PhotoTherapeutics Inc.                             503331          0           175555
Qlogic Corp                                            190135          0           142745
Qualcomm Inc.                                          354668          0           124332
RF Micro Devices Inc                                        0          0           120596
Radcom Ltd.                                                 0          0            65597
Radio One Inc.                                         145229          0           124265
Ramtron Intl Inc                                            0          0            10000
Rare Medium Group Inc                                  606748          0           488371
Redback Networks                                        41355          0            14837
Remec Inc                                                   0          0            12000
ResourcePhoenix.com Inc                                     0          0            10000
Robotic Vision Systems                                  77411          0           188744
Rural Cellular Corp                                      1599          0            19548
SCIQUEST.COM INC                                        52636          0            18274
SDL Inc.                                                55087          0            45358
SK Telecom Co Ltd-ADR                                  925620          0           120657
Santa Cruz Operation Inc                                43803          0            31970
Sapient Corporation                                    322381          0           112168
Satyam Infoway Ltd ADR                                 334077          0            81288
Scient Corp                                             70998          0            26357
Scientific Learning Corp                                12052          0            13697
Seibel Systems Inc                                     347668          0           121194
Sigma Designs Inc.                                       7456          0            74595
Silicon Storage Tech                                   546105          0           504160
Socket Communications                                       0          0            60000
Sonic Wall                                              11244          0             8959
Sound Advice Inc.                                           0          0            21775
Spanish Broadcasting Sys Cl A                          153055          0            55330
</TABLE>
<PAGE>   9
<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus Capital Management, Inc. ("DCM")
====================================================================================================================================
                                                                                                             Item 6:
                                                                                    Item 5:           Investment Discretion
                                                                                    Shares     =====================================
            Item 1:                       Item 2:        Item 3:      Item 4:         or
        Name of Issuer                Title of Class      Cusip     Fair Market    Principal               (b) Shared       (c)
                                                         Number        Value         Amount     (a)sole   -As Defined     Shared -
                                                                                                           in Instr. V     Other
====================================================================================================================================
<S>                                   <C>                <C>        <C>            <C>         <C>        <C>             <C>
Spectra-physics Lasers              Common         84756810            560      20000X
Spectrian Corp                      Common         84760810            678      24000X
Spectrum Control Inc.               Common         84761510            319      30000X
Strategic Diagnostic Inc            Common         86270010            282      42928X
SurModics Inc.                      Common         86887310           1107      36890X
TERRA NETWORKS SA-SPONS ADR         ADR            88100W10          40745     744204X
TSI Intl Software Ltd               Common         87287910          12988     229377X
TTI Team Telecom Intl Ltd           ADR            M8825810           1114      61489X
TV Azteca SA - Spons ADR            ADR            90114510            354      39333X
Tegal Corp                          Common         87900810            221      25000X
Telefonos de Mexico - Sp. ADR L     ADR            87940378          38445     341737X
Teletech Holdings Inc               Common         87993910          31191     925467X
Telular Corp.                       Common         87970T20            190      20000X
Teva Pharmaceutical - Sp. ADR       ADR            88162420          15902     221828X
Three-Five Systems Inc.             Common         88554L10          24981     609294X
Thrunet Co. Ltd. Cl A               ADR            Y4997510          30276     446053X
Titan Corp.                         Common         88826610          36150     764063X
Tmp Worldwide Inc                   Common         87294110           2155      15178X
Topps Company (The)                 Common         89078610            197      19029X
Triquint Semiconductor              Common         89674K10          17328     155758X
U T I Energy Corp                   Common         90338710            376      16323X
U.S. Wireless Corporation           Common         90339C10            378      25000X
Unify Corp                          Common         90474310           3176     116002X
Usdata Corp                         Common         91729410            583      42000X
VISX Inc.                           Common         92844S10           2070      40000X
Valuevision Intl Cl A               Common         92047K10          38418     670329X
Vari L Co Inc                       Common         92215010           3518     102713X
Veeco Instruments Inc               Common         92241710            468      10000X
Verisign Inc.                       Common         92343E10          37653     197199X
Veritas Software Corp               Common         92343610          42676     298173X
Versant Object Technology           Common         92528410            315      36000X
Vignette Corp                       Common         92673410          27614     169414X
Vitafort International Corp.        Common         92846730             77     100000X
Voicestream Wireless Corp           Common         92861510           8897      62519X
Wal-Mart Stores Inc.                Common         93114210           6843      99000X
Webhire Inc                         Common         94768W10            169      10000X
Westwood One Inc.                   Common         96181510           8548     112480X
Winfield Capital Corp.              Common         97385910            863      23000X
Workflow Management Inc.            Common         98137N10           1047      36578X
Xicor Inc.                          Common         98490310           2032     148458X
Zamba Corp                          Common         98888110           3256     187418X
Zoll Medical Corp.                  Common         98992210           3159      82719X
Zoran Corp.                         Common         98975F10          15543     278793X
aremissoft corp                     Common         04002610            670      20601X
braun consulting                    Common         10565110           2384      33341X
ditech communications               Common         25500M10          32653     349234X
e-Sim Limited                       ADR            M4099010            137      10000X
                                                                   4039760   58833249
<CAPTION>
============================================================================================
                                                                 (SEC USE ONLY)
============================================================================================
                                                                    Item 8:
                                                           Voting Authority (Shares)
                                                    ========================================
                                         Item 7:
                                        Managers
                                      See Instr. V    (a) Sole     (b) Shared     (c) None
============================================================================================
<S>                                   <C>            <C>           <C>            <C>
Spectra-physics Lasers                              0           0     20000
Spectrian Corp                                      0           0     24000
Spectrum Control Inc.                               0           0     30000
Strategic Diagnostic Inc                            0           0     42928
SurModics Inc.                                  21427           0     15463
TERRA NETWORKS SA-SPONS ADR                    667868           0     76336
TSI Intl Software Ltd                          127371           0    102006
TTI Team Telecom Intl Ltd                        3949           0     57540
TV Azteca SA - Spons ADR                        39333           0         0
Tegal Corp                                          0           0     25000
Telefonos de Mexico - Sp. ADR L                301908           0     39829
Teletech Holdings Inc                          513799           0    411668
Telular Corp.                                       0           0     20000
Teva Pharmaceutical - Sp. ADR                  164651           0     57177
Three-Five Systems Inc.                        313920           0    295374
Thrunet Co. Ltd. Cl A                          369196           0     76857
Titan Corp.                                    424191           0    339872
Tmp Worldwide Inc                               11251           0      3927
Topps Company (The)                                 0           0     19029
Triquint Semiconductor                         115541           0     40217
U T I Energy Corp                                   0           0     16323
U.S. Wireless Corporation                           0           0     25000
Unify Corp                                       9817           0    106185
Usdata Corp                                         0           0     42000
VISX Inc.                                           0           0     40000
Valuevision Intl Cl A                          345505           0    324824
Vari L Co Inc                                    7969           0     94744
Veeco Instruments Inc                               0           0     10000
Verisign Inc.                                  146220           0     50979
Veritas Software Corp                          221346           0     76827
Versant Object Technology                           0           0     36000
Vignette Corp                                  124409           0     45005
Vitafort International Corp.                        0           0    100000
Voicestream Wireless Corp                       46075           0     16444
Wal-Mart Stores Inc.                                0           0     99000
Webhire Inc                                         0           0     10000
Westwood One Inc.                               83500           0     28980
Winfield Capital Corp.                              0           0     23000
Workflow Management Inc.                         3265           0     33313
Xicor Inc.                                      11471           0    136987
Zamba Corp                                      14356           0    173062
Zoll Medical Corp.                              30929           0     51790
Zoran Corp.                                    130427           0    148366
aremissoft corp                                     0           0     20601
braun consulting                                 2248           0     31093
ditech communications                          180143           0    169091
e-Sim Limited                                       0           0     10000
                                             34556180              24277069
</TABLE>


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