<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 13F
Form 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: June 30, 2000
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: Oberweis Asset Management, Inc.
Address: 951 Ice Cream Dr., Suite 200
North Aurora, IL 60542
Form 13F File Number: 28-4688
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: Patrick B. Joyce
Title: Executive Vice President
Phone: (800) 323-6166
Signature, Place, and Date of Signing:
Patrick B. Joyce North Aurora, IL August 7, 2000
------------------------- [City, State] [Date]
[Signature]
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).)
[_] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this
reporting manger are reported in this report and a portion are reported by other
reporting manager(s).)
List of Other Managers reporting for this Manager:
[If there are no entries in this list, omit this section.]
<PAGE>
FORM 13F SUMMARY PAGE
Report Summary:
Number of other Included Managers: ___________________
Form 13F Information Table Entry Total: 211 Data Records
Form 13F Information Table Value Total: $218,235 (thousandths)
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 manger filing this report.
[If there are no entries in this list, state "NONE" and omit the column headings
and list entries.]
NONE
<PAGE>
Oberweis Asset Management, Inc.
FORM 13F
June 30, 2000
<TABLE>
<CAPTION>
Voting Authority
Value Shares/ Sh/ Put/ Invstmt Other --------------------------
Name of Issuer Title of class CUSIP (x$1000) Prn Amt Prn Call Dscretn Managers Sole Shared None
------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- --------
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
1-800 Contacts, Inc. com 681977104 1457 31000 SH Sole 30000 1000
ACT Manufacturing Inc. com 000973107 785 16900 SH Sole 15000 1900
ATMI,Inc. com 00207R101 3974 85455 SH Sole 70000 15455
AVT Corporation com 002420107 136 18400 SH Sole 18400
Abaxis com 002567105 421 63000 SH Sole 40000 23000
Act Teleconferencing, Inc. com 58 10000 SH Sole 10000
Actuate Corporation com 00508B102 1212 22700 SH Sole 20000 2700
Acxiom Corp. com 005125109 373 13700 SH Sole 13700
Administaff, Inc. com 635 10000 SH Sole 10000
Advance Paradigm Inc. com 007491103 5195 253400 SH Sole 230000 23400
Advanced Digital com 007525108 159 10000 SH Sole 10000
American Eagle Outfitters com 02553E106 840 60000 SH Sole 60000
American Management Systems com 027352103 230 7000 SH Sole 7000
American Technical Ceramics Co com 030137103 3365 120700 SH Sole 90000 30700
Andrx Corporation com 034551101 10913 170720 SH Sole 135000 35720
Applied Power, Inc.-CL A com 038225108 271 8100 SH Sole 8100
Appnet, Inc. com 03831Q101 1656 46000 SH Sole 46000
Aremissoft Corporation com 040026106 1239 39800 SH Sole 10000 29800
Arguss Holdings com 321 17000 SH Sole 17000
Aspeon, Inc. com 045354107 122 25000 SH Sole 25000
Atwood Oceanics, Inc. com 050095108 280 6300 SH Sole 6300
Audiovox Corporation Class A com 050757103 3254 147475 SH Sole 116000 31475
Avanti Corporation com 053487104 225 12000 SH Sole 12000
Avert, Inc. com 053596102 1121 49000 SH Sole 30000 19000
Barr Labs com 068306109 390 8700 SH Sole 8700
Barrett Resources Corporation com 068480201 511 16800 SH Sole 15000 1800
Bell Microproducts com 078137106 2093 113900 SH Sole 100000 13900
Beta Oil & Gas, Inc. com 08659A104 364 33500 SH Sole 20000 13500
Biovail Corp. Intl. com 09067K106 222 4000 SH Sole 4000
Brooks Automation Inc. com 11434a100 294 4600 SH Sole 4000 600
Business Resource Group com 12329k104 255 40000 SH Sole 40000
CCC Information Services Grp com 12487q109 125 11750 SH Sole 11750
Candela Corporation com 2475 271200 SH Sole 247500 23700
Carreker-Antinori Inc. com 144433109 670 74400 SH Sole 60000 14400
Carrier Access Corporation com 144460102 1911 36135 SH Sole 19500 16635
Carrizo Oil & Gas, Inc. com 144577103 94 15700 SH Sole 15700
Casey's General Stores com 147528103 207 20000 SH Sole 20000
Catalina Marketing Corp. com 148867104 510 5000 SH Sole 5000
Check Point Software com M22465104 646 3050 SH Sole 2000 1050
Chico's Fas Inc. com 168615102 3621 181060 SH Sole 132000 49060
Children's Place com 168905107 998 48700 SH Sole 46000 2700
Cima Labs com 171796105 801 39550 SH Sole 18000 21550
Consolidated Graphics, Inc. com 209341106 101 10750 SH Sole 10750
Crown Group, Inc. com 228359105 102 20000 SH Sole 20000
Cutter & Buck Inc. com 232217109 585 73650 SH Sole 56500 17150
Cybex Computer Products com 232522102 1907 45000 SH Sole 45000
Cytyc com 232946103 2171 40680 SH Sole 12000 28680
DRS Technologies com 252456405 323 27800 SH Sole 27800
Dataram Corp. com 238108203 575 20000 SH Sole 20000
Dense-Pac Microsystems, Inc. com 248719304 272 25000 SH Sole 25000
Diamond Tech Partners, Inc. com 252762109 1056 12000 SH Sole 12000
Digital Lightwave Inc. com 253855100 6714 66765 SH Sole 48000 18765
Diodes, Inc. com 254543101 643 15000 SH Sole 15000
Direct Focus, Inc com 254931108 490 10000 SH Sole 10000
Ditech Communications com 25500M103 820 8670 SH Sole 4000 4670
Dset Corporation com 262504103 820 27000 SH Sole 15000 12000
E.Mergent, Inc. com 26874a105 485 102200 SH Sole 46000 56200
EGL, Inc. com 270018104 392 12750 SH Sole 12750
Efficient Networks, Inc. com 282056100 257 3500 SH Sole 3500
Elron Electronic com 552 15000 SH Sole 15000
Emmis Broadcasting Corp. - CL com 291525103 349 8442 SH Sole 8442
Exactech, Inc. com 30064E109 159 10000 SH Sole 10000
Excel Technology Inc. com 30067T103 3226 64125 SH Sole 62500 1625
Expeditors Intl Wash, Inc. com 302130109 698 14700 SH Sole 14700
Express Scripts A com 302182100 351 5650 SH Sole 5650
Extreme Networks, Inc. com 30226D106 580 5500 SH Sole 2000 3500
F5 Networks, Inc. com 315616102 3028 55500 SH Sole 30000 25500
FTI Consulting, Inc. com 302941109 105 10000 SH Sole 10000
Frenchtex com 357814102 0 25000 SH Sole 25000
Gasonics International Corp. com 367278108 1700 43100 SH Sole 39000 4100
Genesis Microchip Inc. com 371933102 847 47400 SH Sole 40000 7400
Gentex Corp. com 371901109 352 14000 SH Sole 14000
Gentner Communications com 37245J105 2387 170500 SH Sole 100000 70500
HA-LO Industries, Inc. com 404429102 73 13000 SH Sole 13000
Hain Celestial Group Inc com 405217100 2320 63245 SH Sole 40000 23245
Hall Kinion & Assoc. com 406069104 2302 69100 SH Sole 49400 19700
Hi/fn, Inc. com 428358105 373 8415 SH Sole 8415
Hot Topic Inc. com 441339108 1386 43300 SH Sole 40000 3300
Icos Vision Systems com B49233107 1095 30000 SH Sole 30000
Idexx Laboratories, Inc. com 45168d104 210 9200 SH Sole 9200
Ikos Systems Inc. com 451716203 2332 215700 SH Sole 170000 45700
Informix, Corp. com 456779107 193 26000 SH Sole 26000
Insight Enterprises Inc. com 457650103 483 8150 SH Sole 7500 650
Integrated Measurement com 457923100 1107 70275 SH Sole 50000 20275
Intel Corporation com 458140100 473 3540 SH Sole 3540
Interiors, Inc. CL A com 458688108 7 10000 SH Sole 10000
Interpore Intl. com 46062W107 300 31000 SH Sole 20000 11000
Intest Corp. com 461147100 595 40000 SH Sole 20000 20000
Intranet Solutions, Inc. com 460939309 2256 58800 SH Sole 50000 8800
Jakks Pacific Inc. com 47012E106 295 20000 SH Sole 20000
Jones Pharma, Inc. com 480236108 475 11900 SH Sole 11900
K.V. Pharmaceutical Co. com 482740206 453 17100 SH Sole 17100
Kemet Corporation com 488360108 872 34800 SH Sole 12000 22800
Kent Electronics com 490553104 394 13200 SH Sole 13200
Key Production Company, Inc. com 493138101 782 44700 SH Sole 30700 14000
King Pharmaceuticals Inc. com 495582108 10144 231195 SH Sole 188400 42795
Knight Transportation com 499064103 240 16500 SH Sole 16500
Koala Corporation com 499866101 151 10660 SH Sole 6000 4660
Latitude Communications, Inc. com 518292107 671 60000 SH Sole 60000
Lifemark Corporation com 53219F102 472 78650 SH Sole 50000 28650
Loronix Information Systems com 544183106 216 6000 SH Sole 6000
M G I Pharmaceutical com 552880106 1340 46600 SH Sole 40000 6600
Magic Software Enterprises Ltd com 559166103 641 60000 SH Sole 60000
Magnum Hunter Resources, Inc. com 55972F203 132 20000 SH Sole 20000
Manatron Inc. com 562048108 165 20000 SH Sole 20000
Meade Instruments Corporation com 583062104 578 23000 SH Sole 20000 3000
Measurement Specialties Inc. com 583421102 683 17800 SH Sole 10000 7800
Mercury Interactive Corporatio com 589405109 1732 17900 SH Sole 4000 13900
Meridian Resource Corp. com 58977q109 455 80000 SH Sole 80000
Merix Corp. com 590049102 470 10000 SH Sole 10000
Michaels Stores, Inc. com 594087108 916 20000 SH Sole 10000 10000
Micro Component Technology com 86 10000 SH Sole 10000
Microchip Technology, Inc. com 595017104 377 6475 SH Sole 6475
Microsoft Corp. com 594918104 272 3400 SH Sole 3400
Monterey Pasta Co. com 612570101 1651 394200 SH Sole 297000 97200
Multi Link Telecommunications com 62541M107 104 10000 SH Sole 10000
NCI Building Systems, Inc. com 628852105 324 16000 SH Sole 16000
NU Horizons Electrs Corp. com 669908105 1552 58300 SH SOLE 40000 18300
Nanometrics, Inc. com 630077105 1664 40400 SH SOLE 40000 400
National Computer Systems, Inc com 635519101 364 7400 SH SOLE 7400
Netopia, Inc. com 64114k104 1291 32080 SH SOLE 30000 2080
Netsmart Technologies com 64114W306 284 54800 SH SOLE 51700 3100
New Horizons Worldwide com 645526104 290 12500 SH SOLE 12500
Newfield Exploration com 651290108 313 8000 SH SOLE 8000
Nhancement Technologies, Inc. com 65334P104 186 14000 SH SOLE 14000
Nice Systems Ltd. com 653656108 772 10000 SH SOLE 10000
Nokia Corp ADR com 654902204 251 5020 SH SOLE 5020
North American Scientific, Inc com 65715D100 2607 145320 SH SOLE 110000 35320
Nova Corp/Georgia com 669784100 344 12325 SH SOLE 12325
Novamed Eyecare, Inc. com 66986W108 176 20000 SH SOLE 20000
Nur Macroprinters LTD. com M75165106 283 19500 SH SOLE 17000 2500
Nvidia Corp. com 254 4000 SH SOLE 4000
Occidental Pete Corp. com 674599105 621 29500 SH SOLE 29500
Ontrack Data Int'l com 683372106 94 12000 SH SOLE 12000
P.F. Changs China Bistro com 69333y108 1981 62025 SH SOLE 40000 22025
PSI Technologies Holdings - A com 207 10000 SH SOLE 10000
PW Eagle, Inc. com 69366Y108 639 35275 SH SOLE 10000 25275
Patterson Dental Co. com 703412106 388 7600 SH SOLE 7600
Peregrine Systems com 71366Q101 231 6656 SH SOLE 6656
Photon Dynamics Inc. com 719364101 2282 30550 SH SOLE 16000 14550
Polycom Inc. com 73172K104 640 6800 SH SOLE 6000 800
Polymedica Corp. com 731738100 6149 142165 SH SOLE 112000 30165
Power-One, Inc. com 684 6000 SH SOLE 6000
PowerWave Technology com 739363109 1989 45215 SH SOLE 18000 27215
Prima Energy Corporation com 741901201 2792 52180 SH SOLE 40000 12180
Pro Dex, Inc. com 74265M106 80 32900 SH SOLE 32900
Qlogic Corp com 747277101 2340 35420 SH SOLE 30000 5420
Quanta Services, Inc. com 74762E102 291 5300 SH SOLE 5000 300
Quest Diagnostics, Inc. com 74834L100 523 7000 SH SOLE 5000 2000
Quest Education Corp. com 74835f102 181 10000 SH SOLE 10000
RMH Teleservices, Inc. com 749938106 760 51500 SH SOLE 30000 21500
Radiant Systems com 75025N102 763 31800 SH SOLE 30000 1800
Radisys Corp. com 750459109 718 12650 SH SOLE 10000 2650
Railamerica Inc. com 750753105 127 20000 SH SOLE 20000
Rare Hospitality Intl., Inc. com 753820109 395 14000 SH SOLE 14000
Rehabcare Group, Inc. com 759148109 749 27500 SH SOLE 24000 3500
Rehabilicare Incorporated com 758944102 141 50000 SH SOLE 50000
Remedy Corp. com 759548100 660 11835 SH SOLE 7000 4835
Reptron Electronics, Inc. com 76026W109 140 12000 SH SOLE 12000
Right Management Consultants com 766573109 256 24400 SH SOLE 24400
Robotic Vision Systems, Inc. com 771074101 1525 84750 SH SOLE 80000 4750
Rogue Wave Software com 775369101 83 17000 SH SOLE 17000
Rubios Restaurant, Inc. com 78116B102 239 29000 SH SOLE 25000 4000
SBS Broadcasting SA com l8137f102 311 5700 SH SOLE 5700
Sagent Technology, Inc. com 786693101 149 10423 SH SOLE 10423
Salton Inc. com 795757103 7168 194400 SH SOLE 160000 34400
Sani Tech Industry Inc. com 0 11000 SH SOLE 11000
Sawtek Inc. com 805468105 201 3500 SH SOLE 3000 500
ScanSource, Inc. com 806037107 2613 67225 SH SOLE 50000 17225
Sicor, Inc. com 825846108 1806 225700 SH SOLE 140000 85700
Silicon Storage Tech com 827057100 3204 36280 SH SOLE 24000 12280
Silicon Valley Bancshares com 827064106 202 7800 SH SOLE 6000 1800
Silicon Valley Group, Inc. com 827066101 1035 40000 SH SOLE 40000
Siliconix, Inc. com 827079203 780 11550 SH SOLE 7000 4550
Source Information Management com 836151209 1959 128450 SH SOLE 100000 28450
Spartech Corp. com 847220209 305 11300 SH SOLE 11300
Spectralink Corp. com 847580107 292 20000 SH SOLE 20000
Stericycle, Inc. com 858912108 1626 67750 SH SOLE 50000 17750
Steven Madden Ltd. com 556269108 288 43900 SH SOLE 35000 8900
Strategic Diagnostics, Inc. com 862700101 83 15000 SH SOLE 15000
Suprema Specialties, Inc. com 86859f107 2587 275900 SH SOLE 190000 85900
TTI Team Telecom com m88258104 1093 30350 SH SOLE 30000 350
Talx Corporation com 874915105 545 31800 SH SOLE 30000 1800
Tefron LTD. com M87482101 171 10000 SH SOLE 10000
Teleflex, Inc. com 879369106 325 9100 SH SOLE 9100
Tetra Tech, Inc. com 88162g103 459 20053 SH SOLE 20053
The Bisys Group, Inc. com 055472104 320 5196 SH SOLE 5196
Three-Five Systems com 88554L108 929 15750 SH SOLE 15000 750
Tidel Technologies, Inc. com 886368109 692 69600 SH SOLE 50000 19600
Tiffany & Co. com 886547108 358 5300 SH SOLE 5300
Titan Corporation com 888266103 478 10681 SH SOLE 10000 681
Tollgrade Communications com 889542106 2197 16580 SH SOLE 4000 12580
Transaction Systems Architects com 893416107 200 11700 SH SOLE 11700
Transwitch Corporation com 894065101 2586 33500 SH SOLE 33500
Triton Energy 'A' com G90751101 1179 30000 SH SOLE 10000 20000
USA Networks, Inc. com 368 17000 SH SOLE 17000
United Natural Foods, Inc. com 911163103 362 26350 SH SOLE 26350
V3 Semiconductor Inc. com 918392101 1368 77075 SH SOLE 69000 8075
Vans, Inc. com 921930103 219 15000 SH SOLE 15000
Verity Inc. com 92343C106 4381 115300 SH SOLE 85400 29900
Vintage Pete, Inc. com 927460105 1373 60850 SH SOLE 50000 10850
Visual Networks, Inc. com 928444108 935 32800 SH SOLE 26000 6800
Vitesse Semiconductor Co. com 928497106 603 8200 SH SOLE 8200
Wendy's International Inc. com 950590109 191 10700 SH SOLE 10700
Whole Foods Market, Inc. com 966837106 304 7350 SH SOLE 7350
Wind River Systems com 973149107 576 15200 SH SOLE 15200
Worldcom Inc. com 98157d106 351 7656 SH SOLE 7656
Xeta Corporation com 983909102 483 15500 SH SOLE 15000 500
Zebra Technologies Corp.-Cl A com 989207105 641 14470 SH SOLE 14470
Zevex International, Inc. com 98950E400 2238 421340 SH SOLE 320000 101340
Zoll Medical Corporation com 989922109 1323 27010 SH SOLE 20000 7010
REPORT SUMMARY 211 DATA RECORDS 218235 0 OTHER MANAGERS ON WHOSE BEHALF REPORT IS FILED
Do not save this screen as a text file. This report automatically creates the text file inflable.txt, which meets all SEC filing
requirements. For details on the location of this text file, see your 705 Report documentation.
</TABLE>
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