<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: September 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 October 27, 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 manager 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>
Oberweis Asset Management, Inc.
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FORM 13F
September 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 2976 62000 SH SOLE 60000 2000
ACT Manufacturing Inc. com 000973107 903 17125 SH SOLE 15000 2125
APW Ltd. com G04397108 395 8100 SH SOLE 8100
ATMI,Inc. com 00207R101 2059 88080 SH SOLE 70000 18080
AVT Corporation com 002420107 102 18400 SH SOLE 18400
Abaxis com 002567105 367 63800 SH SOLE 40000 23800
Abbott Laboratories com 002824100 209 4400 SH SOLE 4400
Acln, Ltd. com M01764105 736 27500 SH SOLE 25000 2500
Act Teleconferencing, Inc. com 75 10000 SH SOLE 10000
Actuate Corporation com 00508B102 1568 45400 SH SOLE 40000 5400
Acxiom Corp. com 005125109 403 12700 SH SOLE 12700
Administaff, Inc. com 757 10000 SH SOLE 10000
Advance Paradigm Inc. com 007491103 12486 295970 SH SOLE 245000 50970
Allaire Corp. com 016714107 406 47725 SH SOLE 40000 7725
American Technical Ceramics Co com 030137103 1954 125350 SH SOLE 90000 35350
Andrx Corporation com 034553107 12239 131070 SH SOLE 105000 26070
Aremissoft Corporation com 040026106 1567 41800 SH SOLE 10000 31800
Arguss Holdings com 347 17000 SH SOLE 17000
Astropower, Inc. com 04644A101 610 15400 SH SOLE 10000 5400
Atwood Oceanics, Inc. com 050095108 263 6300 SH SOLE 6300
Audiovox Corporation Class A com 050757103 2229 147975 SH SOLE 116000 31975
Avanti Corporation com 053487104 219 12000 SH SOLE 12000
Avert, Inc. com 053596102 985 49250 SH SOLE 30000 19250
Avocent Corporation com 2205 40000 SH SOLE 40000
BP Amoco PLC com 055622104 238 4490 SH SOLE 4490
BTU International, Inc. com 056032105 295 20000 SH SOLE 20000
Barr Labs com 068306109 511 7700 SH SOLE 7700
Barrett Resources Corporation com 068480201 635 16800 SH SOLE 15000 1800
Bell Microproducts com 078137106 5917 189350 SH SOLE 150000 39350
Biovail Corp. Intl. com 09067K106 326 4000 SH SOLE 4000
CCC Information Services Grp com 12487q109 95 11750 SH SOLE 11750
Candela Corporation com 136907102 719 65400 SH SOLE 60000 5400
Carreker-Antinori Inc. com 144433109 1985 101800 SH SOLE 70000 31800
Carrizo Oil & Gas, Inc. com 144577103 350 25000 SH SOLE 25000
Casey's General Stores com 147528103 260 20000 SH SOLE 20000
Catalina Marketing Corp. com 148867104 564 15000 SH SOLE 15000
Check Point Software com M22465104 709 4500 SH SOLE 4000 500
Chico's Fas Inc. com 168615102 6348 186710 SH SOLE 132000 54710
Children's Place com 168905107 1357 52700 SH SOLE 46000 6700
</TABLE>
1
<PAGE>
Oberweis Asset Management, Inc.
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FORM 13F
September 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>
Christopher & Banks Corp. com 171046105 1079 27750 SH SOLE 20000 7750
Cima Labs com 171796105 1468 28200 SH SOLE 15000 13200
Credence Systems Corp. com 225302108 652 21750 SH SOLE 5000 16750
Crown Group, Inc. com 228359105 96 20000 SH SOLE 20000
Cutter & Buck Inc. com 232217109 926 74450 SH SOLE 56500 17950
Cybear Group com 034553206 22 16768 SH SOLE 14890 1878
Cymer Inc. com 232572107 218 7100 SH SOLE 3000 4100
Cytyc com 232946103 1767 40980 SH SOLE 12000 28980
DRS Technologies com 252456405 452 27800 SH SOLE 27800
Dataram Corp. com 238108203 2094 102750 SH SOLE 80000 22750
Dense-Pac Microsystems, Inc. com 248719304 141 25000 SH SOLE 25000
Diamond Tech Partners, Inc. com 252762109 965 13000 SH SOLE 12000 1000
Digital Lightwave Inc. com 253855100 5488 75561 SH SOLE 57041 18520
Diodes, Inc. com 254543101 2354 153100 SH SOLE 120000 33100
Ditech Communications com 25500M103 310 7570 SH SOLE 4000 3570
Dset Corporation com 262504103 2570 124600 SH SOLE 95000 29600
E. W. Blanch Holdings, Inc. com 093210102 222 10700 SH SOLE 10700
EGL, Inc. com 270018104 340 11250 SH SOLE 11250
Ectel Ltd. com M29925100 1675 84000 SH SOLE 60000 24000
Elron Electronic com 544 15000 SH SOLE 15000
Engineered Support Systems, In com 292866100 287 15000 SH SOLE 15000
Epiq Systems, Inc. com 26882D109 276 17800 SH SOLE 14200 3600
Evolving Systems, Inc. com 325 50000 SH SOLE 50000
Exactech, Inc. com 30064E109 174 10000 SH SOLE 10000
Expeditors Intl Wash, Inc. com 302130109 586 13000 SH SOLE 13000
Express Scripts A com 302182100 408 5650 SH SOLE 5650
Extreme Networks, Inc. com 30226D106 1259 11000 SH SOLE 4000 7000
F5 Networks, Inc. com 315616102 2710 79700 SH SOLE 45000 34700
FTI Consulting, Inc. com 302941109 79 10000 SH SOLE 10000
Frenchtex com 357814102 4 25000 SH SOLE 25000
Gasonics International Corp. com 367278108 565 46100 SH SOLE 39000 7100
General Electric Co. com 369604103 524 9090 SH SOLE 9090
Genesis Microchip Inc. com 371933102 637 34900 SH SOLE 30000 4900
Gentex Corp. com 371901109 350 14000 SH SOLE 14000
Gentner Communications com 37245J105 2105 171000 SH SOLE 100000 71000
Hain Celestial Group Inc com 405217100 2084 59345 SH SOLE 40000 19345
Hall Kinion & Assoc. com 406069104 2072 72850 SH SOLE 49400 23450
Healthcare.com Corp. com 42221Y100 292 108800 SH SOLE 100000 8800
Hi/fn, Inc. com 428358105 573 8415 SH SOLE 8415
</TABLE>
2
<PAGE>
Oberweis Asset Management, Inc.
--------------------------------------------------------------------------------
FORM 13F
September 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>
Hot Topic Inc. com 441339108 1443 48100 SH SOLE 40000 8100
Icos Vision Systems com B49233107 1009 33300 SH SOLE 30000 3300
Idexx Laboratories, Inc. com 45168d104 246 9200 SH SOLE 9200
Ikos Systems Inc. com 451716203 2191 211200 SH SOLE 170000 41200
Infocus Corp. com 45665B106 827 15600 SH SOLE 8000 7600
Informix, Corp. com 456779107 66 16000 SH SOLE 16000
Insight Enterprises Inc. com 457650103 333 12225 SH SOLE 11250 975
Integrated Measurement com 457923100 953 70575 SH SOLE 50000 20575
Intel Corporation com 458140100 294 7080 SH SOLE 7080
Interiors, Inc. CL A com 458688108 4 10000 SH SOLE 10000
Interpore Intl. com 46062W107 225 30000 SH SOLE 20000 10000
Interwest Home Medical, Inc. com 142 40000 SH SOLE 40000
Intest Corp. com 461147100 347 35700 SH SOLE 20000 15700
Intranet Solutions, Inc. com 460939309 2440 48800 SH SOLE 40000 8800
Iridex Corp. com 164 15000 SH SOLE 15000
K.V. Pharmaceutical Co. com 482740206 702 20000 SH SOLE 20000
Kemet Corporation com 488360108 917 33200 SH SOLE 12000 21200
Kent Electronics com 490553104 291 12200 SH SOLE 12200
Key Production Company, Inc. com 493138101 1202 54500 SH SOLE 40000 14500
King Pharmaceuticals Inc. com 495582108 6414 191832 SH SOLE 130250 61582
Knight Transportation com 499064103 257 16500 SH SOLE 16500
Koala Corporation com 499866101 926 57680 SH SOLE 30000 27680
Lifemark Corporation com 53219F102 703 82650 SH SOLE 50000 32650
M-Systems Flash Disk com M7061C100 458 12000 SH SOLE 8000 4000
Mackie Designs, Inc. com 218 28200 SH SOLE 28200
Macrovision Corp. com 555904101 243 3000 SH SOLE 3000
Magnum Hunter Resources, Inc. com 55972F203 182 20000 SH SOLE 20000
Matec Corp. com 576668107 307 20000 SH SOLE 20000
Meade Instruments Corporation com 583062104 513 25400 SH SOLE 20000 5400
Mercury Interactive Corporatio com 589405109 1356 8650 SH SOLE 4000 4650
Meridian Medical Technologies, com 589658103 1986 115150 SH SOLE 52000 63150
Meridian Resource Corp. com 58977q109 550 80000 SH SOLE 80000
Merix Corp. com 590049102 3071 47385 SH SOLE 30000 17385
Michaels Stores, Inc. com 594087108 800 20000 SH SOLE 10000 10000
Micro Component Technology com 80 10000 SH SOLE 10000
Microchip Technology, Inc. com 595017104 321 9712 SH SOLE 9712
Microsoft Corp. com 594918104 205 3400 SH SOLE 3400
Monterey Pasta Co. com 612570101 2051 405200 SH SOLE 297000 108200
Multi Link Telecommunications com 62541M107 80 10000 SH SOLE 10000
</TABLE>
3
<PAGE>
Oberweis Asset Management, Inc.
--------------------------------------------------------------------------------
FORM 13F
September 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>
NCI Building Systems, Inc. com 628852105 234 16000 SH SOLE 16000
NU Horizons Electrs Corp. com 669908105 1769 63600 SH SOLE 40000 23600
Nanometrics, Inc. com 630077105 2653 49650 SH SOLE 40000 9650
Netopia, Inc. com 64114k104 467 42480 SH SOLE 34000 8480
Newfield Exploration com 651290108 373 8000 SH SOLE 8000
Nice Systems Ltd. com 653656108 720 10000 SH SOLE 10000
North American Scientific, Inc com 65715D100 4782 150620 SH SOLE 110000 40620
Nova Corp/Georgia com 669784100 194 11325 SH SOLE 11325
Novamed Eyecare, Inc. com 66986W108 44 16200 SH SOLE 6200 10000
Nur Macroprinters LTD. com M75165106 301 22500 SH SOLE 20000 2500
Nvidia Corp. com 327 4000 SH SOLE 4000
Occidental Pete Corp. com 674599105 644 29506 SH SOLE 29506
Ontrack Data Int'l com 683372106 160 12000 SH SOLE 12000
Optimal Robotics Corp. com 68388R208 2102 52230 SH SOLE 30000 22230
P.F. Changs China Bistro com 69333y108 2126 61525 SH SOLE 40000 21525
PSI Technologies Holdings - A com 127 10000 SH SOLE 10000
PW Eagle, Inc. com 69366Y108 649 44775 SH SOLE 20000 24775
Patterson Dental Co. com 703412106 315 14000 SH SOLE 14000
Pegasus Solutions, Inc. com 705906105 327 16700 SH SOLE 8700 8000
Photon Dynamics Inc. com 719364101 963 25500 SH SOLE 16000 9500
Polycom Inc. com 73172K104 911 13600 SH SOLE 12000 1600
Polymedica Corp. com 731738100 5744 133965 SH SOLE 100000 33965
Power-One, Inc. com 739308104 873 14420 SH SOLE 12000 2420
PowerWave Technology com 739363109 1690 44515 SH SOLE 18000 26515
Prima Energy Corporation com 741901201 2938 55180 SH SOLE 40000 15180
Pro Dex, Inc. com 74265M106 170 80000 SH SOLE 80000
Professional Detailing, Inc. com 74312N107 1499 26300 SH SOLE 22000 4300
Qlogic Corp com 747277101 3039 34530 SH SOLE 30000 4530
Qualstar Corp. com 74758R109 1147 96050 SH SOLE 40000 56050
Quest Diagnostics, Inc. com 74834L100 746 6500 SH SOLE 5000 1500
RMH Teleservices, Inc. com 749938106 827 51500 SH SOLE 30000 21500
Radisys Corp. com 750459109 632 12500 SH SOLE 10000 2500
Railamerica Inc. com 750753105 156 20000 SH SOLE 20000
Rare Hospitality Intl., Inc. com 753820109 367 18000 SH SOLE 18000
Raymond James Financial com 754730109 240 7300 SH SOLE 7300
Rehabcare Group, Inc. com 759148109 1996 46960 SH SOLE 30000 16960
Rehabilicare Incorporated com 758944102 144 50000 SH SOLE 50000
Remington Oil & Gas com 759594302 593 56800 SH SOLE 56800
Reptron Electronics, Inc. com 76026W109 743 45700 SH SOLE 40000 5700
</TABLE>
4
<PAGE>
Oberweis Asset Management, Inc.
--------------------------------------------------------------------------------
FORM 13F
September 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>
Right Management Consultants com 766573109 281 24400 SH SOLE 24400
Robotic Vision Systems, Inc. com 771074101 83 13925 SH SOLE 13925
Rubios Restaurant, Inc. com 78116B102 172 29000 SH SOLE 25000 4000
SBS Broadcasting SA com l8137f102 227 5700 SH SOLE 5700
SEI Corp. com 784117103 318 4500 SH SOLE 4500
Sagent Technology, Inc. com 786693101 79 10423 SH SOLE 10423
Salton Inc. com 795757103 5482 169650 SH SOLE 155000 14650
Sani Tech Industry Inc. com 0 11000 SH SOLE 11000
Sawtek Inc. com 805468105 327 8500 SH SOLE 3000 5500
ScanSource, Inc. com 806037107 3906 73175 SH SOLE 50000 23175
Sento Corp. com 816918106 200 50000 SH SOLE 50000
Sicor, Inc. com 825846108 2451 239100 SH SOLE 140000 99100
Silicon Storage Tech com 827057100 4619 169890 SH SOLE 114000 55890
Silicon Valley Bancshares com 827064106 419 7200 SH SOLE 6000 1200
Silicon Valley Group, Inc. com 827066101 1174 44600 SH SOLE 40000 4600
Siliconix, Inc. com 827079203 545 11550 SH SOLE 7000 4550
Source Information Management com 836151209 870 127700 SH SOLE 100000 27700
Spartech Corp. com 847220209 176 11300 SH SOLE 11300
Stericycle, Inc. com 858912108 1635 66750 SH SOLE 50000 16750
Suprema Specialties, Inc. com 86859f107 2808 349000 SH SOLE 220000 129000
TTI Team Telecom com m88258104 672 33000 SH SOLE 30000 3000
Talx Corporation com 874915105 850 33000 SH SOLE 33000
Tefron LTD. com M87482101 236 20000 SH SOLE 20000
Teleflex, Inc. com 879369106 313 9100 SH SOLE 9100
Tetra Tech, Inc. com 88162g103 530 18553 SH SOLE 18553
The Bisys Group, Inc. com 055472104 324 4196 SH SOLE 4196
Tidel Technologies, Inc. com 886368109 483 69600 SH SOLE 50000 19600
Tiffany & Co. com 886547108 409 10600 SH SOLE 10600
Titan Corporation com 888266103 176 10681 SH SOLE 10000 681
Tollgrade Communications com 889542106 2143 15440 SH SOLE 4000 11440
Transaction Systems Architects com 893416107 190 11700 SH SOLE 11700
Transwitch Corporation com 894065101 3634 57000 SH SOLE 57000
Triton Energy 'A' com G90751101 1267 32490 SH SOLE 10000 22490
USA Networks, Inc. com 902984103 351 16000 SH SOLE 16000
United Natural Foods, Inc. com 911163103 301 24350 SH SOLE 24350
V3 Semiconductor Inc. com 918392101 331 20000 SH SOLE 20000
Vans, Inc. com 921930103 231 15000 SH SOLE 15000
Verity Inc. com 92343C106 4359 122140 SH SOLE 85400 36740
Vintage Pete, Inc. com 927460105 1498 65851 SH SOLE 50000 15851
</TABLE>
5
<PAGE>
Oberweis Asset Management, Inc.
--------------------------------------------------------------------------------
FORM 13F
September 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>
Vitesse Semiconductor Co. com 928497106 249 2800 SH SOLE 2800
Walgreen Company com 931422109 303 8000 SH SOLE 8000
Wendy's International Inc. com 950590109 215 10700 SH SOLE 10700
Whole Foods Market, Inc. com 966837106 395 7350 SH SOLE 7350
Wind River Systems com 973149107 671 14000 SH SOLE 14000
Worldcom Inc. com 98157d106 251 8256 SH SOLE 8256
Zebra Technologies Corp.-Cl A com 989207105 667 13870 SH SOLE 13870
Zevex International, Inc. com 98950E400 2566 436840 SH SOLE 320000 116840
REPORT SUMMARY 203 DATA RECORDS 232706 O OTHER MANAGERS ON WHOSE BEHALF REPORT IS FILED
</TABLE>
Do not save this screen as a text file. This report automatically creates the
text file inftable txt, which meets all SEC filing requirements. For details on
the location of this text file, see your 705 Report documentation.
6
<PAGE>
FORM 13F SUMMARY PAGE
Report Summary:
Number of other Included Managers: _______________
Form 13F Information Table Entry Total: 203 Data Records
Form 13F Information Table Value Total: $232,706 (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 manager filing this report.
[If there are no entries in this list, state "NONE" and omit the column headings
and list entries.]
NONE
