DRIEHAUS CAPITAL MANAGEMENT INC
13F-HR, 1999-11-12
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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:     September 30, 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. Weis                Chicago, Illinois             November 11, 1999
- -----------------------    --------------------------------    -----------------

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:           223
                                            ------------------
Form 13F Information Table Value Total:     $ 1993430
                                            ------------------
                                                (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>
ACT Manufacturing Inc.                       Common        97310            936         37342X
AO Tatneft - Sponsored ADR                   ADR           03737P30         106         34000X
ARIBA                                        Common        04033V10        9675         66953X
ASM Lithography Holding NV                   ADR           N0705911       41934        625303X
Abgenix Inc.                                 Common        00339B10        1775         45298X
Accrue Software                              Common        00437W10         872         38735X
Active Voice Corp.                           Common        493810           158         10000X
Activision Inc.                              Common        493020          8838        501425X
AdaptiveBroadband Corp                       Common        00650M10       19568        584119X
Adobe Systems Inc.                           Common        00724F10       16915        149027X
Advanced Digital Info. Corp.                 Common        752510          1192         42864X
Advanced Fibre Communication                 Common        00754A10        1929         86700X
Affymetrix Inc.                              Common        00826T10       50783        515886X
Amdocs Ltd.                                  Common        G0260210       11599        552331X
Anadigics Inc.                               Common        3251510          402         14277X
Applied Micro Circuits Corp.                 Common        03822W10       24962        437924X
Applix Inc.                                  Common        3831610          117         10000X
Argosy Gaming Company                        Common        4022810          789         59531X
Art Technology Group                         Common        04289L10       12095        317763X
ArthroCare Corp.                             Common        4313610         3298         60372X
Artisoft Inc.                                Common        04314L10         528         81200X
Asyst Technologies Inc.                      Common        04648X10        3533        107061X
Audiocodes Ltd.                              ADR           M1534210        9868        262260X
Aurora Biosciences Corp.                     Common        5192010         1379        101190X
Basin Exploration Inc.                       Common        7010710         2650        110413X
Bidhit.com Inc                               Common        08883R20        1805        601547X
Biogen Inc.                                  Common        9059710        17280        219256X
Blonder Tongue Labs                          Common        9369810          136         17000X
Braun's Fashions Corp.                       Common        10565810         182         10000X
Broadcom Corp. -  Cl. A                      Common        11132010       13979        128251X
Broadvision Inc                              Common        11141210       18820        141441X
Business Objects S. A. Sp ADR                ADR           12328X10       48365        819745X
C Cube Microsystems Inc.                     Common        12501510       12052        277051X
C-COR Electronics                            Common        12501010        6869        226133X
CMG Information Services Inc.                Common        12575010       24055        234683X
CNET Inc.                                    Common        12594510       21579        385348X
CYRO-CELL International Inc.                 Common        22889510         114         24000X
Cable Design Technologies                    Common        12692410        1762         77229X
California Amplifier Inc.                    Common        12990010        3535        243816X
Calpine Corporation                          Common        13134710       22133        260201X
CardioDynamics Intl. Corp.                   Common        14159710        1073        357718X


<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>
ACT Manufacturing Inc.                                          2700             0        34642
AO Tatneft - Sponsored ADR                                     34000             0            0
ARIBA                                                          48840             0        18113
ASM Lithography Holding NV                                    548650             0        76653
Abgenix Inc.                                                    3173             0        42125
Accrue Software                                                19496             0        19239
Active Voice Corp.                                                 0             0        10000
Activision Inc.                                               259669             0       241756
AdaptiveBroadband Corp                                        277982             0       306137
Adobe Systems Inc.                                            109204             0        39823
Advanced Digital Info. Corp.                                    3055             0        39809
Advanced Fibre Communication                                       0             0        86700
Affymetrix Inc.                                               322981             0       192905
Amdocs Ltd.                                                   475720             0        76611
Anadigics Inc.                                                     0             0        14277
Applied Micro Circuits Corp.                                  320918             0       117006
Applix Inc.                                                        0             0        10000
Argosy Gaming Company                                           4222             0        55309
Art Technology Group                                          163457             0       154306
ArthroCare Corp.                                               19723             0        40649
Artisoft Inc.                                                      0             0        81200
Asyst Technologies Inc.                                        55359             0        51702
Audiocodes Ltd.                                               230001             0        32259
Aurora Biosciences Corp.                                        7157             0        94033
Basin Exploration Inc.                                         56932             0        53481
Bidhit.com Inc                                                575872             0        25675
Biogen Inc.                                                   160716             0        58540
Blonder Tongue Labs                                                0             0        17000
Braun's Fashions Corp.                                             0             0        10000
Broadcom Corp. -  Cl. A                                        93992             0        34259
Broadvision Inc                                               103271             0        38170
Business Objects S. A. Sp ADR                                 626894             0       192851
C Cube Microsystems Inc.                                      197573             0        79478
C-COR Electronics                                              98060             0       128073
CMG Information Services Inc.                                 125067             0       109616
CNET Inc.                                                     281606             0       103742
CYRO-CELL International Inc.                                       0             0        24000
Cable Design Technologies                                      40048             0        37181
California Amplifier Inc.                                      10692             0       233124
Calpine Corporation                                           190640             0        69561
CardioDynamics Intl. Corp.                                    202828             0       154890
</TABLE>
<PAGE>   5
<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>
Casino Data Systems                          Common        14758310        638         130933X
Catalysts Semiconductor Inc.                 Common        14888110         85          40000X
Catherine's Stores Corp.                     Common        14916F10        144          11000X
Celgene Corp.                                Common        15102010      21508         794758X
Central European Media Ent. - A              ADR           G2004510         23          15000X
Cephalon Inc.                                Common        15670810      14093         784297X
Cheap Tickets Inc                            Common        16267210       7909         244308X
Check Point Software Tech.                   ADR           M2246510      62692         742463X
China.com                                    ADR           G2108N10     110357        1697798X
Cia Vale do Rio Doce - Sp. ADR               ADR           20441210       4744         224579X
Cidco Inc.                                   Common        17176810        457          35000X
Cinar Corp Inc. - Cl. B Sub Vtg.             Common        17190530        484          16000X
Cohu Inc.                                    Common        19257610        670          31738X
CommScope Inc.                               Common        20337210      15398         473789X
Commtouch Software ltd.                      ADR           M2559610        153          10300X
Comstock Resources Inc.                      Common        20576820        124          30000X
Concurrent Computer Corp.                    Common        20671020       1125         165166X
Conexant Systems                             Common        20714210      20311         279545X
Corel Corp.                                  Common        21868Q10        185          25000X
Corsair Communications Inc.                  Common        22040610        505          71500X
Credence Systems Corp.                       Common        22530210      10735         239229X
Cree Research Inc.                           Common        22544710      20111         592592X
Cubist Pharmaceuticals Inc.                  Common        22967810        681          79535X
Cumulus Media Inc. - Cl. A                   Common        23108210      13586         415626X
Cyberonics                                   Common        23251P10       1749          97846X
Cypress Semiconductor Corp.                  Common        23280610      18172         845190X
Cytyc Corporation                            Common        23294610       6299         162817X
DII Group Inc.                               Common        23294910        943          26800X
DSP Group Inc.                               Common        23332B10      10303         258373X
Datalink Corp                                Common        23793410        176          14900X
Devon Energy Corporation                     Common        25179M10      15850         382497X
Diamond Offshore Drilling                    Common        25271C10       5345         160136X
Diatide Inc.                                 Common        25284210        522          56000X
Digital Lightwave Inc.                       Common        25385510        379          53250X
Digitran Systems Inc.                        Common        25389810         17         223200X
DoubleClick Inc.                             Common        25860930      10610          89064X
Driehaus International Growth Fund           Common        26202810      14510        1050680X
ESS Technology                               Common        26915110        454          34280X
EchoStar Communications - A                  Common        27876210      15626         172069X
Eclipse Surgical Tech                        Common        27884910       1883         114124X
Eidos Plc Adr                                ADR           28248510       2746          43500X
Elantec Semiconductor                        Common        28415510       1449          81939X
Electronic Arts Inc.                         Common        28551210      30774         425202X
Electronics Boutique Hldgs                   Common        28604510      12236         475195X
Emulex Corp.                                 Common        29247520      54196         631098X
Enzon Inc.                                   Common        29390410       7103         232888X
Exar Corp.                                   Common        30064510       1789          47797X
Express Scripts Inc. - Cl. A                 Common        30218210      18927         241877X
Extreme Networks Inc                         Common        30226D10      16700         263775X
Factory 2 U Stores                           Common        30307210       3711         124220X


<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>
Casino Data Systems                                            59951           0          70982
Catalysts Semiconductor Inc.                                       0           0          40000
Catherine's Stores Corp.                                           0           0          11000
Celgene Corp.                                                 393652           0         401106
Central European Media Ent. - A                                    0           0          15000
Cephalon Inc.                                                 407844           0         376453
Cheap Tickets Inc                                             124060           0         120248
Check Point Software Tech.                                    606380           0         136083
China.com                                                    1193943           0         503855
Cia Vale do Rio Doce - Sp. ADR                                224579           0              0
Cidco Inc.                                                         0           0          35000
Cinar Corp Inc. - Cl. B Sub Vtg.                                   0           0          16000
Cohu Inc.                                                       2294           0          29444
CommScope Inc.                                                347423           0         126366
Commtouch Software ltd.                                         8500           0           1800
Comstock Resources Inc.                                            0           0          30000
Concurrent Computer Corp.                                      65139           0         100027
Conexant Systems                                              204320           0          75225
Corel Corp.                                                        0           0          25000
Corsair Communications Inc.                                        0           0          71500
Credence Systems Corp.                                        170376           0          68853
Cree Research Inc.                                            289292           0         303300
Cubist Pharmaceuticals Inc.                                     5748           0          73787
Cumulus Media Inc. - Cl. A                                    215509           0         200117
Cyberonics                                                     36068           0          61778
Cypress Semiconductor Corp.                                   618401           0         226789
Cytyc Corporation                                              86113           0          76704
DII Group Inc.                                                     0           0          26800
DSP Group Inc.                                                125965           0         132408
Datalink Corp                                                      0           0          14900
Devon Energy Corporation                                      280249           0         102248
Diamond Offshore Drilling                                     117337           0          42799
Diatide Inc.                                                       0           0          56000
Digital Lightwave Inc.                                             0           0          53250
Digitran Systems Inc.                                              0           0         223200
DoubleClick Inc.                                               65295           0          23769
Driehaus International Growth Fund                                 0           0        1050680
ESS Technology                                                     0           0          34280
EchoStar Communications - A                                   126486           0          45583
Eclipse Surgical Tech                                           8165           0         105959
Eidos Plc Adr                                                  37872           0           5628
Elantec Semiconductor                                           3605           0          78334
Electronic Arts Inc.                                          311505           0         113697
Electronics Boutique Hldgs                                    245487           0         229708
Emulex Corp.                                                  311789           0         319309
Enzon Inc.                                                    120417           0         112471
Exar Corp.                                                     16648           0          31149
Express Scripts Inc. - Cl. A                                  177231           0          64646
Extreme Networks Inc                                          193359           0          70416
Factory 2 U Stores                                             34259           0          89961
</TABLE>
<PAGE>   6
<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>
Firstcom Corp                                 Common       33763T10         327        32700      X
Four Kids Entertainment Inc.                  Common       35086510       26308       841844      X
Gemstar Intl                                  Common       G3788V10       16132       206492      X
Genzyme Transgenics Corp                      Common       37246E10         240        35500      X
Gildan Activewear Cl A                        ADR          37591610         930        53888      X
Global Datatel Inc                            Common       37934G10          64        10000      X
Global Marine Inc.                            Common       37935240        4083       248404      X
Grey Wolf                                     Common       39788810         293        97500      X
Harmonic Lightwaves Inc.                      Common       41316010       40249       307684      X
Headhunter Net                                Common       42207710         125        10000      X
Hi/FN Inc.                                    Common       42835810       45637       413942      X
Hispanic Broadcasting Corp. - A               Common       43357B10       10525       138261      X
Homeseekers.com                               Common       43760510         363        29000      X
Human Genome Sciences Inc.                    Common       44490310        6942        94124      X
Ilex Oncology Inc                             Common       45192310         274        22400      X
Imclone Systems                               Common       45245W10       10199       306724      X
Inktomi Corporation                           Common       45727710        6589        54893      X
Interleaf, Inc.                               Common       45872920         492        28961      X
Internet Capital Group                        Common       46059C10       24863       282934      X
Internet Initiative Japan ADR                 ADR          46059T10       25918       404964      X
Interphase Corp.                              Common       46059310         782        33472      X
Ion Networks Inc.                             Common       46205P10         174        27000      X
Isle of Capri Casinos                         Common       46459210         484        48394      X
JAKKS Pacific Inc.                            Common       47012E10        1173        31283      X
JDS Uniphase Corp                             Common       46612J10       39541       347419      X
Juniper Networks Inc.                         Common       48203R10        7485        41115      X
Key Energy Group                              Common       49291410         379        76700      X
Lamar Advertising Co                          Common       51281510         743        15000      X
Legato Systems Inc                            Common       52465110       32015       734400      X
Leukosite Inc                                 Common       52728R10         954        47381      X
Lightbridge Inc                               Common       53222610        2245       114049      X
Lightpath Tech Inc                            Common       53225710         219        54000      X
M R V Communications                          Common       55347710       14037       592588      X
M Systems Flsh Dsk Pionr                      ADR          M7061C10         819        76600      X
M T I Technology Corp                         Common       55390310       41197      1786334      X
Macrovision Corp                              Common       55590410       19180       432219      X
Marine Drilling Co.                           Common       56824020        4206       265980      X
Mattson Technology Inc                        Common       57722310         980        82110      X
Maverick Tube                                 Common       57791410         985        59225      X
MedImmune Inc.                                Common       58469910       19194       192601      X
Medarex Inc.                                  Common       58391610         680        95489      X
Mentor Corp./Minn.                            Common       58718810         399        14000      X
Mercury Interactive Corp                      Common       58940510       26699       413541      X
Merix Corp                                    Common       59004910         143        11000      X
Micro Component Tech                          Common       59479Q10          97        25000      X
Microwave Power Devices                       Common       59517M10         383        28000      X
Mih Ltd Tort Shs A                            Common       G6116R10        5489       190104      X
Millenium Pharmaceutic                        Common       59990210        7868       121040      X
Minimed Inc                                   Common       60365K10       20165       205239      X
Monmouth REIT - Cl. A                         Common       60972010         613       114000      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>
Firstcom Corp                                                  12700           0           20000
Four Kids Entertainment Inc.                                  376728           0          465116
Gemstar Intl                                                  132089           0           74403
Genzyme Transgenics Corp                                           0           0           35500
Gildan Activewear Cl A                                         44225           0            9663
Global Datatel Inc                                                 0           0           10000
Global Marine Inc.                                            182035           0           66369
Grey Wolf                                                          0           0           97500
Harmonic Lightwaves Inc.                                      162685           0          144999
Headhunter Net                                                     0           0           10000
Hi/FN Inc.                                                    234294           0          179648
Hispanic Broadcasting Corp. - A                               101379           0           36882
Homeseekers.com                                                    0           0           29000
Human Genome Sciences Inc.                                     68976           0           25148
Ilex Oncology Inc                                                  0           0           22400
Imclone Systems                                               159289           0          147435
Inktomi Corporation                                            40104           0           14789
Interleaf, Inc.                                                 2096           0           26865
Internet Capital Group                                        207400           0           75534
Internet Initiative Japan ADR                                 355428           0           49536
Interphase Corp.                                               14776           0           18696
Ion Networks Inc.                                                  0           0           27000
Isle of Capri Casinos                                              0           0           48394
JAKKS Pacific Inc.                                             14750           0           16533
JDS Uniphase Corp                                             254096           0           93323
Juniper Networks Inc.                                          29757           0           11358
Key Energy Group                                                   0           0           76700
Lamar Advertising Co                                               0           0           15000
Legato Systems Inc                                            537812           0          196588
Leukosite Inc                                                   3417           0           43964
Lightbridge Inc                                                 5882           0          108167
Lightpath Tech Inc                                                 0           0           54000
M R V Communications                                          292566           0          300022
M Systems Flsh Dsk Pionr                                           0           0           76600
M T I Technology Corp                                         795876           0          990458
Macrovision Corp                                              194176           0          238043
Marine Drilling Co.                                           137923           0          128057
Mattson Technology Inc                                          5936           0           76174
Maverick Tube                                                   4275           0           54950
MedImmune Inc.                                                141027           0           51574
Medarex Inc.                                                   31464           0           64025
Mentor Corp./Minn.                                                 0           0           14000
Mercury Interactive Corp                                      302998           0          110543
Merix Corp                                                         0           0           11000
Micro Component Tech                                               0           0           25000
Microwave Power Devices                                            0           0           28000
Mih Ltd Tort Shs A                                            160636           0           29468
Millenium Pharmaceutic                                         88637           0           32403
Minimed Inc                                                   150201           0           55038
Monmouth REIT - Cl. A                                              0           0          114000
</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>
NS Group Inc.                                 Common       62891610       156         14500      X
Netopia Inc                                   Common       64114K10      9462        237300      X
Netoptix Corp                                 Common       64116F10       952         44023      X
Netsolve                                      Common       64115J10       888         50000      X
Newfield Exploration Company                  Common       65129010      9499        288392      X
Northeast Optic Network                       Common       66433410      2597         68783      X
Novadigm Inc.                                 Common       66993710       683         46710      X
Noven Pharmaceuticals                         Common       67000910       187         22000      X
Nyfix Inc                                     Common       67071210       678         26197      X
Optimal Robotics Corp                         Common       68388R20      2772        153980      X
Orckit Communications Limited                 ADR          M7531S10     33908        958539      X
Ortel Corp                                    Common       68749W10       202         13000      X
Outdoor Systems Inc                           Common       69005710      1626         45480      X
PE Corp-PE Biosystems                         Common       69332S10     11836        163822      X
PMC - Sierra Inc.                             Common       69344F10     20455        221136      X
Pacific Internet Ltd                          ADR          Y6618310      8665        270774      X
Packeteer Inc                                 Common       69521010      6191        181759      X
Patterson Energy Inc                          Common       70341410       636         41868      X
Performance Tech Inc                          Common       71376K10      2897        128379      X
Pericom Semiconductor                         Common       71383110       556         37400      X
Phone.Com                                     Common       71920Q10      8261         54528      X
Photon Dynamics Inc                           Common       71936410      1959         93300      X
Point Of Sale Limited                         ADR          M7945W10       998         87723      X
Power Integrations Inc                        Common       73927610     10052        145153      X
Powerwave Tech Inc                            Common       73936310       885         18353      X
Precision Drilling Corp.                      ADR          74022D10      3635        156769      X
Price Communications Corp.                    Common       74143730     26625       1062355      X
Private Bancorp Inc                           Common       74296210      1947        109662      X
Puma Technology Inc                           Common       74588710      1165         76400      X
QLT PhotoTherapeutics Inc.                    ADR          74692710     12301        160923      X
Qlogic Corp                                   Common       74727710     42804        613124      X
Qualcomm Inc.                                 Common       74752510     25350        133995      X
RF Micro Devices Inc                          Common       74994110     35753        781482      X
Radio One Inc.                                Common       75040P10      4165        100351      X
Redback Networks                              Common       75720910     13874        128467      X
Remington Oil & Gas Corp.                     Common       75959430       171         30000      X
Research in Motion Inc                        ADR          76097510      6460        208800      X
Rural Cellular Corp                           Common       78190410      2093         45632      X
SDL Inc.                                      Common       78407610      6299         82544      X
SK Telecom Co Ltd-ADR                         ADR          78440P10       857         83064      X
Santa Cruz Operation Inc                      Common       80183310      3848        322359      X
Sapient Corporation                           Common       80306210      5647         59912      X
Scient Corp                                   Common       80864H10     11287        176364      X
Seibel Systems Inc                            Common       82617010     10043        150741      X
Silicon Storage Tech                          Common       82705710      1104         78187      X
Sound Advice Inc.                             Common       83606610       181         25000      X
Spectrian Corp                                Common       84760810      1243         57155      X
Startek Inc                                   Common       85569C10      1404         25586      X
Stone Energy Corp                             Common       86164210     11067        217006      X
Strategic Diagnostic Inc                      Common       86270010      3024        333718      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>
NS Group Inc.                                                      0          0            14500
Netopia Inc                                                   116593          0           120707
Netoptix Corp                                                   3176          0            40847
Netsolve                                                       28225          0            21775
Newfield Exploration Company                                  149083          0           139309
Northeast Optic Network                                         4529          0            64254
Novadigm Inc.                                                   3380          0            43330
Noven Pharmaceuticals                                              0          0            22000
Nyfix Inc                                                       1922          0            24275
Optimal Robotics Corp                                          55236          0            98744
Orckit Communications Limited                                 717514          0           241025
Ortel Corp                                                         0          0            13000
Outdoor Systems Inc                                                0          0            45480
PE Corp-PE Biosystems                                         119971          0            43851
PMC - Sierra Inc.                                             161873          0            59263
Pacific Internet Ltd                                          237535          0            33239
Packeteer Inc                                                 131018          0            50741
Patterson Energy Inc                                               0          0            41868
Performance Tech Inc                                            7236          0           121143
Pericom Semiconductor                                              0          0            37400
Phone.Com                                                      39576          0            14952
Photon Dynamics Inc                                             4284          0            89016
Point Of Sale Limited                                          44430          0            43293
Power Integrations Inc                                         58228          0            86925
Powerwave Tech Inc                                                 0          0            18353
Precision Drilling Corp.                                       79453          0            77316
Price Communications Corp.                                    538973          0           523382
Private Bancorp Inc                                                0          0           109662
Puma Technology Inc                                             3620          0            72780
QLT PhotoTherapeutics Inc.                                    117817          0            43106
Qlogic Corp                                                   368296          0           244828
Qualcomm Inc.                                                  97996          0            35999
RF Micro Devices Inc                                          451509          0           329973
Radio One Inc.                                                 47186          0            53165
Redback Networks                                               93916          0            34551
Remington Oil & Gas Corp.                                          0          0            30000
Research in Motion Inc                                        133035          0            75765
Rural Cellular Corp                                            11872          0            33760
SDL Inc.                                                       42457          0            40087
SK Telecom Co Ltd-ADR                                          82464          0              600
Santa Cruz Operation Inc                                      175586          0           146773
Sapient Corporation                                            43902          0            16010
Scient Corp                                                   129210          0            47154
Seibel Systems Inc                                            110333          0            40408
Silicon Storage Tech                                            3867          0            74320
Sound Advice Inc.                                                  0          0            25000
Spectrian Corp                                                  3001          0            54154
Startek Inc                                                     1888          0            23698
Stone Energy Corp                                             112352          0           104654
Strategic Diagnostic Inc                                       16097          0           317621
</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>
Superior Energy Services Inc.                 Common       86815710        253         40000      X
SurModics Inc.                                Common       86887310        385         25857      X
TTI Team Telecom Intl Ltd                     ADR          M8825810        101         10000      X
Taiwan Semiconductor ADR                      ADR          87403910       5139        174203      X
Take-two Interactv Sftwr                      Common       87405410        409         37000      X
Tekelec                                       Common       87910110        254         18400      X
The 3DO Co.                                   Common       88553W10        201         20000      X
Titan Pharmaceuticals Inc                     Common       88831410        876         93480      X
Topps Company (The)                           Common       89078610        211         28173      X
Trend Micro Inc Spon ADR                      ADR          89486M10        177         13500      X
Triquint Semiconductor                        Common       89674K10       1343         23486      X
Tubos De Acero De Mexico - Sp. ADR            ADR          89859250        284         23200      X
U T I Energy Corp                             Common       90338710        563         28950      X
Univision Comm Cl A                           Common       91490610       8162        100296      X
V3 Semiconductor Inc                          ADR          91839210        116         10000      X
VISX Inc.                                     Common       92844S10      42390        535948      X
Valuevision Intl Cl A                         Common       92047K10      20616        792907      X
Veramark Technologies Inc.                    Common       92335110        538         46275      X
Verisign Inc.                                 Common       92343E10      21571        202543      X
Vitafort International Corp.                  Common       92846730         40        100000      X
Voicestream Wireless Corp                     Common       92861510      16654        269842      X
Wal-Mart Stores Inc.                          Common       93114210       4709         99000      X
Westwood One Inc.                             Common       96181510       7872        174452      X
Xicor Inc.                                    Common       98490310        157         28000      X
Zoll Medical Corp.                            Common       98992210       4348        143720      X
Zomax Optical Media Inc.                      Common       98992910       1857         71772      X
Zoran Corp.                                   Common       98975F10      10117        372973      X
aremissoft corp                               Common        4002610        170         15100      X
braun consulting                              Common       10565110        803         48320      X
ditech communications                         Common       25500M10      22107        421082      X
polymedia corp                                Common       73173810       2958        127227      X
Grand Total                                                            1993430      44958165

<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>
Superior Energy Services Inc.                                      0           0          40000
SurModics Inc.                                                 10503           0          15354
TTI Team Telecom Intl Ltd                                       7500           0           2500
Taiwan Semiconductor ADR                                      149585           0          24618
Take-two Interactv Sftwr                                           0           0          37000
Tekelec                                                            0           0          18400
The 3DO Co.                                                        0           0          20000
Titan Pharmaceuticals Inc                                       6735           0          86745
Topps Company (The)                                                0           0          28173
Trend Micro Inc Spon ADR                                       13500           0              0
Triquint Semiconductor                                          1687           0          21799
Tubos De Acero De Mexico - Sp. ADR                             23200           0              0
U T I Energy Corp                                                  0           0          28950
Univision Comm Cl A                                            73339           0          26957
V3 Semiconductor Inc                                               0           0          10000
VISX Inc.                                                     277198           0         258750
Valuevision Intl Cl A                                         371139           0         421768
Veramark Technologies Inc.                                         0           0          46275
Verisign Inc.                                                 148350           0          54193
Vitafort International Corp.                                       0           0         100000
Voicestream Wireless Corp                                     196903           0          72939
Wal-Mart Stores Inc.                                               0           0          99000
Westwood One Inc.                                             127824           0          46628
Xicor Inc.                                                         0           0          28000
Zoll Medical Corp.                                             29478           0         114242
Zomax Optical Media Inc.                                        4185           0          67587
Zoran Corp.                                                   155768           0         217205
aremissoft corp                                                    0           0          15100
braun consulting                                                3147           0          45173
ditech communications                                         213209           0         207873
polymedia corp                                                 28659           0          98568
Grand Total                                                 24541940                   20416226
</TABLE>


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