OAK ASSOCIATES LTD /OH/
13F-HR, 1999-05-14
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<PAGE>   1
FORM 13F                                                                  
<TABLE>
<S>                                                 <C>
                                                      --------------------------
                                                               OMB APPROVAL
                                                           OMB Number: 3235-0006
                                                      Expires: February 28, 1991
                                                      --------------------------
                                                      --------------------------
                                                              SEC USE ONLY
                                               
                                                      --------------------------
                                                      

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            INFORMATION REQUIRED OF INSTITUTIONAL INVESTMENT MANAGERS    
                  PURSUANT TO SECTION 13(f) OF THE SECURITIES            
                    EXCHANGE ACT OF 1934 AND RULES THEREUNDER            
                                                                         
                       Securities and Exchange Commission                
                             Washington, D.C. 20549                      

                                                                         

             Report for the Calendar Year or Quarter Ended March 31, 1999
                                                          ---------    --
- -------------------------------------------------------------------------------
               (PLEASE READ INSTRUCTIONS BEFORE PREPARING FORM.)
- --------------------------------------------------------------------------------
If amended report check here:  [  ]
- --------------------------------------------------------------------------------

Name of Institutional Investment Manager:
  OAK ASSOCIATES, LTD.                      #28-2338
- --------------------------------------------------------------------------------
Business Address:
3875 EMBASSY PARKWAY, #250   AKRON, OHIO     44333
- --------------------------------------------------------------------------------
     Street                   City   State                  Zip

Name, Phone No., and Title of Person Duly Authorized to Submit This Report.
  JAMES D. OELSCHLAGER,            MANAGING MEMBER              (330) 668-1234
- --------------------------------------------------------------------------------

ATTENTION -- Intentional misstatements or omissions of facts constitute Federal
             Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
- --------------------------------------------------------------------------------

                  The institutional investment manager submitting this Form and
           its attachments and the person by whom it is signed represent hereby
           that all information contained therein is true, correct and complete.
           It is understood that all required items, statements and schedules
           are considered integral parts of this Form and that the submission of
           any amendment represents that all unamended items, statements and
           schedules remain true, correct and complete as previously submitted.

                  Pursuant to the requirements of Securities Exchange Act of
           1934, the undersigned institutional investment manager has caused
           this report to be signed on its behalf in the City
            of AKRON and State of OHIO on the  5 day of May, 1999.


                                                   JAMES D. OELSCHLAGER
                                     -----------------------------------------
                                     (Name of Institutional Investment Manager) 
     
                                        /s/ James D. Oelschlager
                                     ------------------------------------------
                                    (Manual Signature of Person Duly Authorized
                                            to Submit This Report)


Name and 13F file numbers of ALL Institutional Investment Managers with respect
to which this schedule is filed (other than the one filing this report): (List
in alphabetical order).

13F File Numbers will be assigned to Institutional Investment Managers after
they file their first report.


Name:                     13F File No.:   Name:                   13F File No.:
- ------------------------- -------------   -------------------     --------------
1.                                        7.
- ------------------------- -------------   -------------------     --------------
2.                                        8.
- ------------------------- -------------   -------------------     --------------
3.                                        9.
- ------------------------- -------------   -------------------     --------------
4.                                        10.
- ------------------------- -------------   -------------------     --------------
5.                                        11.
- ------------------------- -------------   -------------------     --------------
6.                                        12.
- ------------------------- -------------   -------------------     --------------

SEC 1685 (3-88)
<PAGE>   2
<TABLE>
<CAPTION>
                                                       Oak Associates, ltd.
                                                              FORM 13F
                                                              @MANAGED
                                                           March 31, 1999
                                                                                        
                                                                                                           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 
- ----------------         --------------  --------    --------    ------- ---     ----   -------   ---------   ----    ------  -----
                                                                                        
<C>                            <C>      <C>            <C>        <C>                    <C>                 <C>      <C>     <C> 
3com Corporation                COM     885535104       223864     9602728 SH            Sole                9602728           
AT&T Corp                       COM     030177109         2634       33005 SH            Sole                  33005             
Allstate Corp                   COM     020002101          271        7300 SH            Sole                   7300              
America Online                  COM     02364J104         1496       10180 SH            Sole                  10180             
American Express Co             COM     025816109          259        2200 SH            Sole                   2200              
American Home Products          COM     026609107         5461       83700 SH            Sole                  83700             
American Int'l. Grp             COM     026874107       597432     4952805 SH            Sole                4952805           
Ameritech Corp New              COM     030954101          769       13338 SH            Sole                  13338             
Amgen Inc                       COM     031162100          502        6700 SH            Sole                   6700              
Anheuser-Busch Co Inc           COM     035229103          518        6800 SH            Sole                   6800              
Applied Materials Inc           COM     038222105       542499     8794304 SH            Sole                8794304           
Ascend Communications           COM     043491109       554333     6623841 SH            Sole                6623841           
Aspect Telecommunication        COM     045237104        19452     2936157 SH            Sole                2936157           
Atmel Corporation               COM     049513104        63758     4198073 SH            Sole                4198073           
Bancone Corp                    COM     059438101         1007       18290 SH            Sole                  18290             
Bank Of New York Co Inc.        COM     064057102          755       21000 SH            Sole                  21000             
Bank of America Corporation     COM     060505104       425172     6020139 SH            Sole                6020139           
BankBoston Corp.                COM     060716107         6646      153443 SH            Sole                 153443            
Bankers Trust Ny Corp           COM     066365107        11349      128600 SH            Sole                 128600            
Bellsouth Corp                  COM     079860102          439       10968 SH            Sole                  10968             
Berkshire Hathaway (New) Class  COM     084670108          571           8 SH            Sole                      8         
Bristol Myers Squibb            COM     110122108         1603       25000 SH            Sole                  25000             
CVS Corp                        COM     126650100          290        6100 SH            Sole                   6100              
Cablevision Systems Corporatio  COM     12686C109          274        3700 SH            Sole                   3700              
Cambridge Technology Partners   COM     132524109          855       61600 SH            Sole                  61600             
Chase Manhattan Corp            COM     161610100         9336      114732 SH            Sole                 114732            
Ciena Corp Com                  COM     171779101       160999     7155525 SH            Sole                7155525           
Cisco Systems                   COM     17275r102          296        2700 SH            Sole                   2700              
Cisco Systems                   COM     17275R102      3262622    29778636 SH            Sole               29778636           
Citigroup Inc.                  COM     172967101       573026     8971048 SH            Sole                8971048           
Coca Cola Common                COM     191216100          485        7900 SH            Sole                   7900              
Compaq Computer Corporation     COM     204493100       433692    13686518 SH            Sole               13686518           
Connect Inc.                    COM     207528308          210       62266 SH            Sole                  62266             
Dayton Hudson Corp              COM     239753106          413        6200 SH            Sole                   6200              
Dell Computer                   COM     247025109         6511      159300 SH            Sole                 159300            
Diebold Inc.                    COM     253651103         7032      293000 SH            Sole                 293000            
E I Dupont De Nemours & Co      COM     263534109          942       16228 SH            Sole                  16228             
EMC Corp.                       COM     268648102       124534      974825 SH            Sole                 974825            
Eli Lilly & Co.                 COM     532457108       167376     1972033 SH            Sole                1972033           
Emerson Electric                COM     291011104          244        4600 SH            Sole                   4600              
Equity Residential Pptys Tr Sb  COM     29476L107          533       12915 SH            Sole                  12915             
Express Scripts Inc.            COM     302182100        10725      124800 SH            Sole                 124800            
Federal National Morgage Assn   COM     313586109          284        4100 SH            Sole                   4100              
First Data Corp                 COM     319963104        50688     1185673 SH            Sole                1185673           
FirstMerit Corp.                COM     318677101         3274      127132 SH            Sole                 127132            
Forest Laboratories Inc.        COM     345838106         3247       57600 SH            Sole                  57600             
Galileo Technology Ltd.         COM     M47298100          727       24871 SH            Sole                  24871             
Gateway                         COM     367833100         2952       43050 SH            Sole                  43050             
General Electric                COM     369604103        13752      124315 SH            Sole                 124315            
Glimcher Realty Trust           COM     379302102          620       43100 SH            Sole                  43100             
Gulfstream Aerospace            COM     402734107         1457       33600 SH            Sole                  33600             
HRPT Pptys Tr Com Sh Ben Int    COM     40426w101          741       54900 SH            Sole                  54900             
Hewlett Packard Co              COM     428236103          210        3100 SH            Sole                   3100              
Home Depot Incorporated         COM     437076102          268        4300 SH            Sole                   4300              
Intel Corp                      COM     458140100       615794     5180183 SH            Sole                5180183           
International Business Machine  COM     459200101          479        2700 SH            Sole                   2700              
International Network Services  COM     460053101         7371      105400 SH            Sole                 105400            


</TABLE>


                                      1
<PAGE>   3
<TABLE>
<CAPTION>
                                                       Oak Associates, ltd.
                                                              FORM 13F
                                                              @MANAGED
                                                          March 31, 1999
                                                                                        
                                                                                                           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 
- ----------------         --------------  --------    --------    ------- ---     ----   -------   ---------   ----    ------  -----
<C>                            <C>      <C>            <C>        <C>           <C>     <C>       <C>       <C>       <C>     <C> 
Interpublic Group Of Companies  COM     460690100          354        4550 SH            Sole                   4550              
Johnson & Johnson               COM     478160104        11475      122725 SH            Sole                 122725            
Keycorp New                     COM     833663305         2067       68174 SH            Sole                  68174             
Linear Technology Corp.         COM     535678106       394544     7698424 SH            Sole                7698424           
Lucent Technologies             COM     549463107         1383       12806 SH            Sole                  12806             
MASCO CORP COM                  COM     574599106          277        9800 SH            Sole                   9800              
MBNA Corporation                COM     55262L100       225602     9449292 SH            Sole                9449292           
MCI Worldcom Inc.               COM     55268b106         3175       35856 SH            Sole                  35856             
MGIC Investment Corporation     COM     552848103          221        6300 SH            Sole                   6300              
Marsh & Mclennan                COM     571748102          267        3600 SH            Sole                   3600              
Maxim Integrated Products       COM     57772K101       384450     7103002 SH            Sole                7103002           
McDonalds Corp                  COM     580135101          530       11700 SH            Sole                  11700             
Medtronic Inc                   COM     585055106       244372     3399962 SH            Sole                3399962           
Merck & Co Inc                  COM     589331107       517978     6464626 SH            Sole                6464626           
Microsoft                       COM     594918104       897683    10015993 SH            Sole               10015993           
Mobil Corp                      COM     607059102          238        2700 SH            Sole                   2700              
Morgan Stanley Dean Witter & C  COM     617446448       271471     2716407 SH            Sole                2716407           
Mutual Risk Mgmt. Ltd.          COM     628351108         1337       34732 SH            Sole                  34732             
NCS Healthcare Inc.             COM     628874109          126       10500 SH            Sole                  10500             
National City Corporation       COM     635405103          303        4565 SH            Sole                   4565              
Nationwide Financial Services   COM     638612101          378        9000 SH            Sole                   9000              
Network Appliance               COM     64120L104         2481       49000 SH            Sole                  49000             
Nextel Communications Inc Clas  COM     338898109        14856      405633 SH            Sole                 405633            
Nortel Networks Corp            COM     665109104        92252     1484935 SH            Sole                1484935           
Omnicom Group                   COM     681919106          248        3100 SH            Sole                   3100              
PNC Financial Corp              COM     693475105          223        4016 SH            Sole                   4016              
Parametric Technology Corp.     COM     699173100       418159    21172609 SH            Sole               21172609           
Pepsico Inc.                    COM     713448108         1528       38980 SH            Sole                  38980             
Pfizer Inc                      COM     717081103       481144     3467703 SH            Sole                3467703           
Philip Morris Cos.              COM     718154107         1408       40020 SH            Sole                  40020             
Pine Brook Cap Inc Cl A         COM     72246f109            0       10228 SH            Sole                  10228             
Pitney Bowes                    COM     724479100          261        4100 SH            Sole                   4100              
Post Properties, Inc.           COM     737464107          616       17000 SH            Sole                  17000             
Procter & Gamble Co             COM     742718109         3473       35464 SH            Sole                  35464             
Progressive Corporation Ohio    COM     743315103          459        3200 SH            Sole                   3200              
Respironics                     COM     761230101          357       27100 SH            Sole                  27100             
SBC Communications Inc          COM     845333103         1021       21643 SH            Sole                  21643             
Schwab Charles Corp             COM     808513105         2365       24600 SH            Sole                  24600             
Second Bancorp                  COM     813114105          534       22354 SH            Sole                  22354             
State Street Boston Corp        COM     857473102          411        5000 SH            Sole                   5000              
Sugn Inc                        COM     865041107          192       10000 SH            Sole                  10000             
Sun Microsystems                COM     866810104       127963     1023190 SH            Sole                1023190           
Synopsys Inc.                   COM     871607107        86512     1609520 SH            Sole                1609520           
Tellabs                         COM     879664100       299439     3063310 SH            Sole                3063310           
Uniphase Corp                   COM     909149106        20320      176500 SH            Sole                 176500            
Vitesse SemiConductor Corp.     COM     928497106         3301       65200 SH            Sole                  65200             
WASHINGTON MUT INC COM          COM     939322103          276        6750 SH            Sole                   6750              
Wayne Bancorp Inc               COM     944293109         1057       30521 SH            Sole                  30521             
Xilinx Inc.                     COM     983919101       128603     3170488 SH            Sole                3170488           
Xylan Corp.                     COM     984151100        59978     1629270 SH            Sole                1629270           
Buell Industries Inc.                   119061109            0       10000 SH            Sole                  10000             
Cisco Systems                           17275R102          740        6750 SH            Sole                   6750              
Omni-Vista, Inc., Preferred B                              100       50000 SH            Sole                  50000             
Pw Equity Partners Three                                    60       25000 SH            Sole                  25000             
REPORT SUMMARY                   111   DATA RECORDS   12631556              0       OTHER MANAGERS ON WHOSE BEHALF REPORT IS FILED  
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