LAM RESEARCH CORP
424B3, 1999-01-15
SPECIAL INDUSTRY MACHINERY, NEC
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<PAGE>   1

                                                FILED PURSUANT TO RULE 424(b)(3)

                                            REGISTRATION STATEMENT NO. 333-39167

PROSPECTUS SUPPLEMENT NO. 7
(TO PROSPECTUS DATED NOVEMBER 10, 1997)

                                  $310,000,000
                            LAM RESEARCH CORPORATION
                   5% CONVERTIBLE SUBORDINATED NOTES DUE 2002


         This Prospectus Supplement replaces information contained in that
certain Prospectus dated November 10, 1997 and supersedes Prospectus Supplement
No. 1 through Prospectus Supplement No. 6 to such Prospectus, which prior
supplements should be discarded. The Prospectus dated November 10, 1997 and this
Supplement No. 7 (collectively the "Prospectus") relate to the potential sale
from time to time of up to $310,000,000 aggregate amount of Notes and the Common
Stock issuable upon conversion thereof by the Selling Securityholders. This
Prospectus Supplement is not complete without the Prospectus. This Prospectus
Supplement may not be delivered or utilized without the Prospectus. Capitalized
terms used in this Prospectus Supplement but not defined have the meanings
contained in the Prospectus.

         The following information replaces the table set forth in the
Prospectus under the caption "Selling Securityholders" with respect to the
Selling Securityholders and the respective principal amounts of Registrable
Notes beneficially owned by such Selling Securityholders that may be offered
pursuant to the Prospectus, as amended or supplemented:

<TABLE>
<CAPTION>
                                                                               SHARES THAT          PERCENTAGE OF
                                     PRINCIPAL                                 MAY BE SOLD          COMMON STOCK
                                      AMOUNT OF          PERCENTAGE OF         PURSUANT TO              AFTER
                                   NOTES THAT MAY            NOTES                THIS              CONVERSION OF
             NAME                    BE SOLD ($)          OUTSTANDING          PROSPECTUS (1)       THE NOTES (2)
             ----                    -----------          -----------          --------------       -------------
<S>                                <C>                   <C>                   <C>                  <C>
Allstate Insurance Company            2,000,000                *                  22,786                 *
Associated Electric & Gas               250,000                *                   2,848                 *
  Insurance Services                                                                                 
BancAmerica Robertson Stephens        2,040,000                *                  23,242                 *
Bear, Stearns Securities Corp.        2,300,000                *                  26,204                 *
Berger Balanced Fund, A                 200,000                *                   2,278                 *
  Series of the Berger                                                                                 
  Investment Portfolio Trust                                                                           
Boston College Endowment Fund           106,000                *                   1,207                 *
The Common Fund                         870,000                *                   9,912                 *
</TABLE>



<PAGE>   2

<TABLE>
<CAPTION>
                                                                               SHARES THAT          PERCENTAGE OF
                                     PRINCIPAL                                 MAY BE SOLD          COMMON STOCK
                                      AMOUNT OF          PERCENTAGE OF         PURSUANT TO              AFTER
                                   NOTES THAT MAY            NOTES                THIS              CONVERSION OF
             NAME                    BE SOLD ($)          OUTSTANDING          PROSPECTUS (1)       THE NOTES (2)
             ----                    -----------          -----------          --------------       -------------
<S>                                <C>                   <C>                   <C>                  <C>

Consolidated Press                    2,570,000                *                  29,281                 *
  International, Ltd.                                                                                  
Deeprock & Co.                        2,500,000                *                  28,483                 *
Deutsche Bank New York               10,250,000              3.31%               116,782                 *
  Custody Services                                                                                     
Deutsche Bank Securities, Inc.        8,840,000              2.85%               100,717                 *
Emory University Endowment              470,425                *                   5,359                 *
  Fund                                                                                                 
Employers' Reinsurance                  200,000                *                   2,278                 *
  Corporation                                                                                          
Everen Securities, Inc.                 265,000                *                   3,019                 *
Farallon Capital                      9,220,000              2.97%               105,047                 *
  Institutional Partners, L.P.                                                                         
Farallon Capital                      2,615,000                *                  29,793                 *
  Institutional Partners II,                                                                           
  L.P.                                                                                                 
Farallon Capital                        245,000                *                   2,791                 *
  Institutional Partners III,                                                                          
  L.P.                                                                                                 
Farallon Capital Offshore            12,040,000              3.88%               137,176                 *
  Investors, Inc.                                                                                      
Farallon Capital Partners,            9,850,000              3.18%               112,225                 *
  L.P.                                                                                                 
The George Putnam Fund of             1,000,000                *                  11,393                 *
  Boston                                                                                               
Goldman Sachs & Co.                     900,000                *                  10,254                 *
Highbridge Capital Corp.              2,000,000                *                  22,786                 *
Janus Balanced Funds and              5,500,000              1.77%                62,663                 *
  Janus Aspen Balanced Portfolio                                                                       
MainStay Convertible Fund             3,500,000              1.13%                39,876                 *
McMahan Securities Company,             151,000                *                   1,720                 *
  L.P.                                                                                                 
Museum of Fine Arts, Boston             123,000                *                   1,401                 *
</TABLE>



                                      -2-
<PAGE>   3

<TABLE>
<CAPTION>
                                                                               SHARES THAT          PERCENTAGE OF
                                     PRINCIPAL                                 MAY BE SOLD          COMMON STOCK
                                      AMOUNT OF          PERCENTAGE OF         PURSUANT TO              AFTER
                                   NOTES THAT MAY            NOTES                THIS              CONVERSION OF
             NAME                    BE SOLD ($)          OUTSTANDING          PROSPECTUS (1)       THE NOTES (2)
             ----                    -----------          -----------          --------------       -------------
<S>                                <C>                   <C>                   <C>                  <C>
NationsBanc Montgomery                2,000,000                *                  22,786                 *
  Securities, Inc./ San                                                                                
  Francisco                                                                                            
Nesbitt Burns                         1,187,000                *                  13,523                 *
New Hampshire State                     546,000                *                   6,220                 *
  Retirement System                                                                                    
North Star Hedge Fund, L.P.           1,900,000                *                  21,647                 *
Promutual                               458,000                *                   5,218                 *
Putnam Convertible                      299,000                *                   3,406                 *
  Opportunities and Income Trust                                                                       
Putnam Convertible                      550,000                *                   6,266                 *
  Income-Growth Trust                                                                                  
Putnam Funds Trust - Putnam              15,000                *                     170                 *
  High Yield Total Return Fund                                                                         
Putnam High Income                      300,000                *                   3,418                 *
  Convertible and Bond Fund                                                                            
Putnam High Yield Fixed                 100,000                *                   1,139                 *
  Income Fund, LLC                                                                                     
Putnam High Yield Advantage           5,000,000              1.61%                56,967                 *
  Fund                                                                                                 
Putnam High Yield Trust               4,000,000              1.29%                45,573                 *
Putnam Income Fund                    1,500,000                *                  17,090                 *
Putnam Variable Trust -                 900,000                *                  10,254                 *
  Putnam VT High Yield Fund                                                                            
Shephard Investment                   7,245,000              2.34%                82,545                 *
  International, Ltd.                                                                                  
Societe Generale Securities           2,400,000                *                  27,344                 *
  Corp.                                                                                                
SoundShore Partners, L.P.             2,000,000                *                  22,786                 *
STI Classic Mid Cap Fund              5,237,075              1.69%                59,668                 *
STI Classic Mid Cap Variable            290,000                *                   3,304                 *
  Annuity Trust
</TABLE>



                                      -3-

<PAGE>   4

<TABLE>
<CAPTION>
                                                                               SHARES THAT          PERCENTAGE OF
                                     PRINCIPAL                                 MAY BE SOLD          COMMON STOCK
                                      AMOUNT OF          PERCENTAGE OF         PURSUANT TO              AFTER
                                   NOTES THAT MAY            NOTES                THIS              CONVERSION OF
             NAME                    BE SOLD ($)          OUTSTANDING          PROSPECTUS (1)       THE NOTES (2)
             ----                    -----------          -----------          --------------       -------------
<S>                                <C>                   <C>                   <C>                  <C>

Tinicum Partners, L.P.                  190,000                *                   2,164                 *
Tribeca Investments, LLC              2,000,000                *                  22,786                 *
University of Rochester                 108,000                *                   1,230                 *
Any other holder of Notes or                                                                         
  future transferee from any                                                                           
  such holder (3)                  $217,713,000                                2,480,494             
Total                              $310,000,000               100%             3,531,958             
</TABLE>

* Less than one percent.

- ----------
(1) Assumes conversion of the full amount of Notes held by such
Selling Securityholder at the initial conversion price of $87.77 per share. The
conversion price is subject to adjustment as described under "Description of
Notes -- Conversion Rights." Fractional shares will not be issued upon
conversion of the Notes. Cash will be paid in lieu of fractional shares, if any.
The difference in the total from the total set forth on the Prospectus Cover
page is due to the rounding of fractional shares.

(2) The percentage of Common Stock after conversion of the Notes:

         (1) assumes that the Selling Securityholders do not beneficially own
         any Common Stock other than the Common Stock issuable upon conversion
         of the Notes at the initial conversion rate; and

         (2) represents the percentage of the Common Stock each Selling
         Securityholder will have after treating as outstanding the number of
         shares of Common Stock shown as being issuable upon the assumed
         conversion by the named Selling Securityholder of the full amount of
         such holder's Notes but not assuming the conversion of the Notes of any
         other Selling Securityholder.

These percentages are based on 37,634,584 shares of Common Stock that were
issued and outstanding as of November 7, 1997 before taking into account any of
the assumed conversions.

(3) Certain Selling Securityholders, while reserving the right to have their
Notes registered at a later date, have either:

         (1) elected to not have Notes owned by them registered at this time; or

         (2) have not provided the Company with instructions to register their
         Notes at this time.



                                      -4-

<PAGE>   5

Information concerning other selling holders of the Notes will be set forth from
time to time in Prospectus Supplements, if required.

          * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

         Information concerning the Selling Securityholders may change from time
to time. The Company will prepare additional supplements to the Prospectus to
show changed information when necessary. The per share conversion price and the
number of shares issuable upon conversion of the Notes is subject to adjustment
under certain circumstances. The aggregate number of shares of Common Stock
issuable upon conversion of the Notes offered hereby may increase or decrease if
there is an adjustment in the conversion price.



                                      -5-


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