KOMAG INC /DE/
S-3, 1999-06-22
MAGNETIC & OPTICAL RECORDING MEDIA
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         As filed with the Securities  and Exchange  Commission on June 18, 1999
                                                      Registration No. 333-
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                             ----------------------

                                    FORM S-3

                             REGISTRATION STATEMENT
                        Under The Securities Act of 1933

                             ----------------------

                              KOMAG, INCORPORATED
               (Exact name of registrant as specified in charter)


          Delaware                                      94-2914864
  (State of incorporation)               (I.R.S. employer identification number)

                             ----------------------

                            1704 Automation Parkway
                               San Jose, CA 95141
                                 (408) 576-2000
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                             ----------------------

                               Stephen C. Johnson
                     President and Chief Executive Officer
                              Komag, Incorporated
                            1704 Automation Parkway
                               San Jose, CA 95131
                                 (408) 576-2000
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                             ----------------------

                                   Copies to:
                                 Alan K. Austin
                                  Brian C. Erb
                                James C. Creigh
                        Wilson Sonsini Goodrich & Rosati
                               650 Page Mill Road
                              Palo Alto, CA 94304

                             ----------------------

         Approximate Date of Commencement of proposed sale to public:  From time
to time after the effective date of this Registration Statement as determined by
market conditions.
                             ----------------------

         If the only securities  being registered on this Form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. [ ]

         If any of the  securities  being  registered  on  this  Form  are to be
offered  on a  delayed  or  continuous  basis  pursuant  to Rule 415  under  the
Securities Act of 1933,  other than  securities  offered only in connection with
dividend or interest reinvestment plans, check the following box. [X]

         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. [ ]

         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. [ ]

         If delivery of the  prospectus  is expected to be made pursuant to Rule
434, please check the following box. [ ]
<TABLE>

                             ----------------------
<CAPTION>
                                                   CALCULATION OF REGISTRATION FEE
====================================================================================================================================
                                                                          Proposed Maximum     Proposed Maximum       Amount of
                                                       Amount to be       Aggregate Price     Aggregate Offering     Registration
Title of Each Class of Securities to be Registered      Registered          Per Unit(1)            Price(1)              Fee
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                    <C>                      <C>                <C>                <C>
Debt securities and warrants .........................                          --
- ------------------------------------------------------------------------------------------------------------------------------------
Preferred stock, par value $0.01 per share ...........                          --
- ------------------------------------------------------------------------------------------------------------------------------------
Depositary shares representing preferred stock(2) ....                          --
- ------------------------------------------------------------------------------------------------------------------------------------
Common stock, par value $0.01 per share (3) ..........                          --
- ------------------------------------------------------------------------------------------------------------------------------------
Totals ............................................... $150,000,000             --                 $150,000,000       $ 41,700
====================================================================================================================================
<FN>
(1)  Estimated  solely  for the  purpose of  calculating  the  registration  fee
     pursuant to Rule 457. The proposed  maximum offering price per unit will be
     determined  from  time to time by the  Registrant  in  connection  with the
     issuance of securities registered hereunder. No separate consideration will
     be received for common stock,  preferred stock, debt securities or warrants
     that are issued upon conversion or exchange of debt  securities,  preferred
     stock, depositary shares or warrants.

(2)  To be represented by depositary receipts representing an interest in all or
     a specified portion of a share of preferred stock.

(3)  There is also registered  hereunder such indeterminate  number of shares of
     common stock as may from time to time be issued upon conversion or exchange
     of debt securities, preferred stock or warrants registered hereunder.
</FN>
</TABLE>
                             ----------------------

         THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE
OR DATES AS MAY BE NECESSARY TO DELAY ITS  EFFECTIVE  DATE UNTIL THE  REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OR UNTIL THIS  REGISTRATION  STATEMENT SHALL BECOME EFFECTIVE
ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION,  ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
<PAGE>

THE  INFORMATION IN THIS  PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.  WE MAY
NOT SELL  THESE  SECURITIES  UNTIL THE  REGISTRATION  STATEMENT  FILED  WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO  SELL  THESE  SECURITIES  AND IT IS NOT  SOLICITING  AN  OFFER  TO BUY  THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.



                             SUBJECT TO COMPLETION
               PRELIMINARY PROSPECTUS DATED _______________, 1999

PROSPECTUS

                                     [LOGO]

                              KOMAG, INCORPORATED

         Debt  Securities,  Warrants,  Preferred  Stock,  Depositary  Shares and
Common Stock

         We may  offer  from  time  to  time  up to  $150,000,000  of  our  debt
securities, warrants, preferred stock, depositary shares, or common stock.

         When  we  offer  securities,  we will  provide  you  with a  prospectus
supplement  or term sheet  relating  to such  securities.  You should  read this
prospectus  and the  prospectus  supplement or term sheet  carefully  before you
invest. The prospectus  supplement or term sheet for each offering of securities
will describe in more detail the plan of  distribution  for that  offering.  For
general information about the distribution of the securities offered, please see
"Plan of Distribution" in this prospectus.

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.

                 The date of this prospectus is ________, 1999.

<PAGE>


                      WHERE YOU CAN FIND MORE INFORMATION

         We file annual,  quarterly and current  reports,  proxy  statements and
other  information  with the SEC.  You may read and copy any document we file at
the SEC's public reference room at 450 Fifth Street, N.W., Washington, DC 20549.
Please  call the SEC at  1-800-SEC-0330  for further  information  on the public
reference  room.  Our SEC filings are also  available  from the SEC's Website at
"http://www.sec.gov."

         The SEC allows us to "incorporate by reference" the information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to those documents.  The information  incorporated by reference is
considered to be part of this  prospectus,  and  information  that we file later
with the SEC will  automatically  update  and  supersede  this  information.  We
incorporate by reference the following documents:

         *        Our quarterly report on Form 10-Q for our fiscal quarter ended
                  April 4, 1999;

         *        Our current report on Form 8-K dated April 16, 1999;

         *        Our  annual  report on Form  10-K for our  fiscal  year  ended
                  January 3, 1999;

         *        The   description  of  our  common  stock   contained  in  our
                  registration statement on Form 8-A filed with the SEC on April
                  29, 1988; and

         *        Any future  filings  we will make with the SEC under  Sections
                  13(a), 13(c), 14 or 15(d) of the Securities Exchange Act.

         We will provide you with a copy of these  filings,  at no cost,  if you
write or telephone our Corporate Secretary at the following address:

                              Komag, Incorporated
                            1704 Automation Parkway
                               San Jose, CA 95131
                                 (408) 576-2000

         You should rely only on the information or representations  provided in
this  prospectus.  We have  authorized  no one to  provide  you  with  different
information.  We are not making an offer of these securities in any jurisdiction
where the offer is not permitted.  You should not assume that the information in
this  prospectus  is accurate as of any date other than the date on the front of
the document.

<PAGE>

                           FORWARD-LOOKING STATEMENTS

         This prospectus  contains or incorporates by reference  forward-looking
statements that involve risks and uncertainties.  Forward-looking statements can
typically  be  identified  by the use of words such as "may,"  "will,"  "could,"
"project,"   "believe,"    "anticipate,"   "expect,"   "estimate,"   "continue,"
"potential,"  "plan,"  "forecasts," and the like.  These statements  appear in a
number  of  places in this  prospectus  and  include  statements  regarding  our
intentions, plans, strategies,  beliefs or current expectations with respect to,
among other things:

         *        our financial prospects;

         *        our financing plans;

         *        trends affecting our financial condition or operating results;

         *        our strategies for growth, operations, and product development
                  and commercialization; and

         *        conditions  or trends in or factors  affecting the computer or
                  hard disk drive industry.

         Forward-looking  statements are not  guarantees of future  performance.
Forward-looking  statements  involve  risks and  uncertainties  that could cause
actual results to differ  materially  from those  anticipated.  The  information
contained or incorporated by reference in this prospectus  identifies  important
factors  that could cause such  differences.  Among the factors that could cause
actual  results to differ are the  following:  We sell a single  product  into a
market  characterized  by rapid  technological  change and sudden  shifts in the
balance between supply and demand. Further, we are dependent on a limited number
of  customers,  some of whom  also  manufacture  some or most of their own disks
internally.  Competition in the market, defined by both technology offerings and
pricing,  can be intense,  especially during times of excess available  capacity
such as has been prevalent since 1998. We have a high fixed-cost  structure that
can cause operating  results to vary dramatically with changes in product yields
and  utilization  of our  equipment  and  factories.  In addition,  our business
requires substantial investments for research and development activities and for
physical  assets such as  equipment  and  facilities  that are  dependent on our
access to financial resources. These and other risks are discussed more fully in
this prospectus and the documents  incorporated by reference in this prospectus.
We undertake no  obligation  to publicly  release the result of any revisions to
these  forward-looking  statements  that  may  be  made  to  reflect  events  or
circumstances   after  the  date  hereof  or  to  reflect  the   occurrence   of
unanticipated events.



                                      -2-
<PAGE>

                                  THE COMPANY

         Komag,  Incorporated designs,  manufactures and markets thin-film media
(disks),  the primary storage medium for digital data used in computer hard disk
drives.  We believe  we are the  world's  largest  independent  manufacturer  of
thin-film media and are well positioned as a broad-based  strategic  supplier of
choice  for the  industry's  leading  disk  drive  manufacturers.  Our  business
strategy  relies on the  combination  of  advanced  technology  and  high-volume
manufacturing.  Our products  serve the desktop and  enterprise  segments of the
disk drive  market and are used in  products  such as personal  computers,  disk
arrays,  network  file  servers and  engineering  workstations.  We  manufacture
leading-edge  disk  products  primarily  for 3 1/2-inch  form  factor  hard disk
drives.

         Komag  was  organized  in 1983  and is  incorporated  in the  State  of
Delaware.  Our  principal  executive  offices  are  located  at 1704  Automation
Parkway, San Jose, California 95131 and our telephone number is (408) 576-2000.


                                      -3-
<PAGE>

                                USE OF PROCEEDS

         We intend to use the net proceeds  from the sale of the  securities  to
repay  indebtedness  and  for  general  corporate  purposes,   unless  otherwise
specified in the prospectus supplement relating to such securities. Pending such
applications,  we will invest the net  proceeds in  interest-bearing  investment
grade securities.

                       RATIO OF EARNINGS TO FIXED CHARGES

         The following  table sets forth our ratios of earnings to fixed charges
for the periods indicated:


                                                                       Fiscal
                                                                       Quarter
                                                 Fiscal Year            Ended
                                      -------------------------------  April 4,
                                      1994   1995   1996  1997  1998    1999
                                      ----   ----   ----  ----  ----    ----
Ratio of earnings to fixed charges    15.0   31.8   35.3  N/A    N/A     N/A

         For the purpose of calculating  the ratio of earnings to fixed charges,
"earnings"  consist of income before income taxes,  minority interest and equity
in joint venture income (loss) plus fixed charges.  "Fixed  charges"  consist of
interest  expense  incurred and the portion of rental  expense  under  operating
leases deemed by us to represent interest. Our earnings were inadequate to cover
fixed  charges  for fiscal 1997 and 1998 and our fiscal  quarter  ended April 4,
1999  by  approximately  $37.8  million,   $338.8  million  and  $19.5  million,
respectively.

                                 THE SECURITIES

         We intend to sell from time to time:

         *        senior or subordinated debt securities, either of which may be
                  convertible into common stock;

         *        preferred stock;

         *        depositary shares representing preferred stock;

         *        common stock; or

         *        warrants to purchase common stock.

         All of the  foregoing are  collectively  called the  "Securities."  The
Securities may be offered  independently  or together with other  Securities and
may be attached to, or separate from, such other Securities. The Securities will
be offered to the public on terms determined by market conditions at the time of
sale and set forth in a prospectus  supplement.  The Securities offered pursuant
to this  prospectus  may be offered in one or more series of up to  $150,000,000
aggregate public offering price, as we will designate at the time of offering.

                                      -4-
<PAGE>

                         DESCRIPTION OF DEBT SECURITIES

         Debt  securities  will be issued pursuant to an Indenture to be entered
into between  Komag and a qualified  trustee to be  specified  in an  applicable
prospectus supplement (the "Trustee").

         The Indenture will fix the terms of such debt securities, including:

         (1)      the aggregate  principal  amount of such debt  securities  and
                  whether there is any limit upon the aggregate principal amount
                  of such debt securities that may be subsequently issued;

         (2)      the date on which such debt securities will mature;

         (3)      the  principal  amount  payable  with  respect  to  such  debt
                  securities  whether at maturity or upon earlier  acceleration,
                  and whether  such  principal  amount will be  determined  with
                  reference to an index, formula or other method;

         (4)      the rate or rates per annum  (which may be fixed or  variable)
                  at which such debt securities will bear interest, if any;

         (5)      the dates on which such interest, if any, will be payable;

         (6)      the provisions for redemption of such debt securities, if any,
                  the redemption price and any remarketing arrangements relating
                  thereto;

         (7)      the sinking fund  requirements,  if any,  with respect to such
                  debt securities;

         (8)      whether such debt  securities  are  denominated or provide for
                  payment  in United  States  dollars or a foreign  currency  or
                  units of two or more of such foreign currencies;

         (9)      the form  (registered  or bearer  or both) in which  such debt
                  securities  may be issued and any  restrictions  applicable to
                  the  exchange of one form for  another and to the offer,  sale
                  and delivery of such debt securities in either form;

         (10)     whether and under what  circumstances  we must pay  additional
                  amounts in respect  of such debt  securities  held by a person
                  who  is not a  U.S.  person  (as  defined  in  the  prospectus
                  supplement,  as  applicable)  in respect of  specified  taxes,
                  assessments or other governmental  charges and whether we have
                  the option to redeem the affected debt securities  rather than
                  pay such additional amounts;

         (11)     whether such debt securities are to be issued in global form;

         (12)     the title of the debt  securities and the series of which such
                  debt securities shall be a part;

         (13)     the denominations of such debt securities;

         (14)     whether, and the terms and conditions relating to when, we may
                  satisfy certain of our  obligations  with respect to such debt
                  securities  with  regard  to  payment  upon  maturity,  or any
                  redemption or required  repurchase  or in connection  with any
                  exchange  provisions  by  delivering  to the  holders  thereof
                  securities or a combination of cash, other  securities  and/or
                  property;

                                      -5-
<PAGE>

         (15)     the terms of the debt securities with respect to the Events of
                  Default set forth in the Indenture;

         (16)     the  terms,  if any,  upon  which the debt  securities  may be
                  convertible into our common stock and the terms and conditions
                  upon which such  conversion  will be effected,  including  the
                  initial conversion price or rate, and the conversion period;

         (17)     whether,  and the terms and  conditions  relating to when, the
                  debt  securities may be transferred  separately  from warrants
                  when such debt  securities  and warrants are issued  together;
                  and

         (18)     any other terms of the debt securities.

         Reference  is made to the  prospectus  supplement  for the terms of the
debt securities  being offered thereby,  including  whether such debt securities
are senior debt securities or subordinated  debt  securities.  We may deliver to
purchasers of Securities a term sheet instead of a prospectus  supplement.  This
prospectus may be delivered prior to or concurrently with a term sheet.

         Prospective  purchasers of debt securities should be aware that special
U.S. Federal income tax,  accounting and other  considerations may be applicable
to instruments such as debt securities.  The prospectus supplement or term sheet
relating to any issue of debt securities will describe any such considerations.

         The debt  securities  will be  issued,  to the extent  provided  in the
prospectus  supplement or term sheet, in fully  registered form without coupons,
and/or in bearer form with or without coupons, and in denominations set forth in
the prospectus  supplement.  No service charge will be made for any registration
of transfer of registered debt securities or exchange of debt securities, but we
may require  payment of a sum sufficient to cover any tax or other  governmental
charges that may be imposed in connection therewith.  The Indenture will provide
that debt  securities  issued  thereunder  may be issued in global form.  If any
series of debt securities is issuable in global form, the applicable  prospectus
supplement  will  describe the  circumstances,  if any,  under which  beneficial
owners of any such global debt  securities  may exchange such interests for debt
securities  of such  series  and of  like  tenor  and  principal  amount  in any
authorized form and denomination. Principal and any premium, additional amounts,
and interest on, a global Debt  Security will be payable or  deliverable  in the
manner described in the applicable prospectus supplement.

                         DESCRIPTION OF PREFERRED STOCK

         The following  description  sets forth general terms of preferred stock
that we may  issue.  The terms of any  series  of the  preferred  stock  will be
described in the  prospectus  supplement  relating to the preferred  stock being
offered  thereby.  The  description  set  forth  below  and  in  any  prospectus
supplement  does not purport to be complete and is subject to, and  qualified in
its entirety by reference to, our Restated  Certificate  of  Incorporation  (the
"Certificate  of   Incorporation"),   which  is  filed  as  an  exhibit  to  the
Registration  Statement and the Certificate of Designations (the "Certificate of
Designations")  relating to each particular series of the preferred stock, which
will be filed  with  the SEC at or  prior to the time of sale of such  preferred
stock.

         Pursuant to the  Certificate  of  Incorporation,  we are  authorized to
issue up to 1,000,000  shares of undesignated  preferred  stock, par value $0.01
per share.  Our Board of Directors has the  authority,  without  approval of the
stockholders,  to issue all of the shares of preferred stock which are currently
authorized in one or more series and to fix the number of shares and the rights,
preferences,  privileges,  qualifications,  restrictions and limitations of each
series. As of June 17, 1999, we had no shares of preferred stock outstanding.

         In addition,  as described under "Description of Depositary Shares," we
may offer depositary shares evidenced by depositary receipts,  each representing
a  fraction  (to be  specified  in the  prospectus  supplement  relating


                                      -6-
<PAGE>

to the depositary shares offered thereby) of a share of the particular series of
preferred stock issued and deposited with a depositary, in lieu of offering full
shares of such series of preferred stock.

         The preferred  stock will have the dividend,  liquidation,  redemption,
voting and conversion or exchange rights specified in the prospectus  supplement
relating  to the  particular  series of  preferred  stock  offered  thereby.  In
addition,  the applicable prospectus supplement will describe the other terms of
the preferred stock, including, where applicable, the following:

         (1)      the  designation,  stated value and liquidation  preference of
                  such preferred stock and the number of shares offered;

         (2)      the offering price;

         (3)      the  dividend  rate (or method of  calculation),  the dividend
                  periods,  the date on which  dividends  shall be  payable  and
                  whether such  dividends  shall be cumulative or  noncumulative
                  and,  if  cumulative,  the dates  from which  dividends  shall
                  commence to cumulate;

         (4)      any redemption or sinking fund provisions;

         (5)      any conversion or exchange provisions;

         (6)      voting rights, if any;

         (7)      to the  extent  permitted  by  applicable  law,  whether  such
                  preferred  stock will be issued in  certificated or book-entry
                  form;

         (8)      whether  such  preferred  stock  will be listed on a  national
                  securities exchange or the Nasdaq Stock Market;

         (9)      information with respect to book-entry procedures, if any; and

         (10)     any additional rights,  preferences,  privileges,  limitations
                  and  restrictions  of such  preferred  stock (which may not be
                  inconsistent   with  the  provisions  of  the  Certificate  of
                  Incorporation or the Certificate of Designations  establishing
                  such series of preferred stock).

         The  preferred  stock will be, when issued  against  payment  therefor,
fully paid and nonassessable.  Holders thereof will have no preemptive rights to
subscribe for any  additional  securities  that we may issue.  Unless  otherwise
specified in the applicable prospectus supplement,  the shares of each series of
preferred  stock  will  rank on a parity  with all other  outstanding  series of
preferred stock issued by us as to payment of dividends  (except with respect to
cumulation  thereof) and as to the  distribution of assets upon our liquidation,
dissolution,  or winding up. Each series of  preferred  stock will rank prior to
the common stock,  and any other  capital  stock of ours that is expressly  made
junior to such series of preferred stock.

         Unless  otherwise  specified in the applicable  prospectus  supplement,
ChaseMellon  Shareholder  Services  LLC,  will be the transfer  agent,  dividend
disbursing agent and registrar for the shares of the preferred stock.

                        DESCRIPTION OF DEPOSITARY SHARES

         We may  issue  receipts  for  depositary  shares,  each of  which  will
represent a fraction of a share of preferred stock. Shares of preferred stock of
each class or series  represented by depositary  shares will be deposited  under

                                      -7-
<PAGE>

deposit  agreements to be entered into among Komag, a bank or trust company,  as
depository, and the holders from time to time of the depositary receipts. A copy
of  the  form  of  deposit   agreement,   including  the  form  of  certificates
representing  the  depositary  receipts,  will be  filed  as an  exhibit  to the
Registration Statement prior to the issuance of any depositary shares.

         The depositary shares are to be evidenced by depositary receipts issued
pursuant to the applicable deposit agreement. Immediately following our issuance
and  delivery  of the  preferred  stock to the  depositary,  we will  cause  the
depositary to issue the depositary receipts on our behalf.  Subject to the terms
of the applicable deposit agreement, each holder of a depositary receipt will be
entitled,  in  proportion  to  the  fraction  of  a  share  of  preferred  stock
represented by such  depositary  share, to all the rights and preferences of the
preferred stock represented  thereby (including  dividend,  voting,  conversion,
redemption and liquidation  rights),  all as will be set forth in the prospectus
supplement relating to the depositary receipts offered thereby.

         The depositary shares will have the dividend, liquidation,  redemption,
voting and conversion or exchange rights specified in the applicable  prospectus
supplement.  The applicable  prospectus  supplement will also describe the other
terms of depositary shares offered thereby,  the deposit  agreement  relating to
such depositary shares and the depositary receipt certificates representing such
depositary shares, including the following:

         (1)      the  designation,  stated value and liquidation  preference of
                  such depositary shares and the number of shares offered;

         (2)      the offering price or prices;

         (3)      the  dividend  rate or rates (or method of  calculation),  the
                  dividend  periods,  the  dates  on  which  dividends  shall be
                  payable and whether  such  dividends  shall be  cumulative  or
                  noncumulative  and,  if  cumulative,   the  dates  from  which
                  dividends shall commence to cumulate;

         (4)      any redemption or sinking fund provisions;

         (5)      any conversion or exchange provisions;

         (6)      any material risk factors relating to such depositary shares;

         (7)      the identity of the depositary; and

         (8)      any other terms of such depositary shares.

                             DESCRIPTION OF WARRANTS

         We may issue warrants for the purchase of common stock.  Each series of
warrants will be issued under a warrant  agreement to be entered into between us
and a bank  or  trust  company,  as  warrant  agent,  all as  set  forth  in the
prospectus  supplement  relating to the warrants offered thereby.  A copy of the
form  of  warrant  agreement,   including  the  form  of  warrant   certificates
representing  the  warrants  reflecting  the  provisions  to be  included in the
warrant  agreements  that  will be  entered  into  with  respect  to  particular
offerings of warrants, will be filed as an exhibit to the Registration Statement
prior to the issuance of any warrants.

                                      -8-
<PAGE>

         The  applicable  prospectus  supplement  will describe the terms of the
warrants offered thereby,  the warrant  agreement  relating to such warrants and
the warrant certificates, including the following:

         (1)      the offering price or prices;

         (2)      the  aggregate  number of shares of common  stock  that may be
                  purchased upon exercise of such warrants and minimum number of
                  warrants that are exercisable;

         (3)      the number of Securities, if any, with which such warrants are
                  being  offered and the number of such  warrants  being offered
                  with each such Security;

         (4)      the date on and after  which  such  warrants  and the  related
                  Securities, if any, will be transferable separately;

         (5)      the number of shares of common stock purchasable upon exercise
                  of each such  warrant  and the price at which  such  number of
                  shares of common  stock may be purchased  upon such  exercise,
                  and events or conditions under which such number of shares may
                  be subject to adjustment;

         (6)      the date on which the right to exercise  such  warrants  shall
                  commence and the date on which such right shall expire;

         (7)      the circumstances, if any, which will cause the warrants to be
                  deemed to be automatically exercised;

         (8)      any material risk factors relating to such warrants;

         (9)      the identity of the warrant agent; and

         (10)     any  other  terms  of  such  warrants   (which  shall  not  be
                  inconsistent with the provisions of the warrant agreement).

         Warrant  certificates may be exchanged for new warrant  certificates of
different   denominations,   may  (if  in  registered  form)  be  presented  for
registration of transfer,  and may be exercised at the corporate trust office of
the warrant  agent or any other office  indicated in the  applicable  prospectus
supplement. Prior to the exercise of any warrants, holders of such warrants will
not have any rights of holders of shares of the common  stock  purchasable  upon
such exercise,  including the right to receive payments of dividends, if any, on
the  common  stock  purchasable  upon  such  exercise  or the right to vote such
underlying common stock.

         Prospective  purchasers  of warrants  should be aware that special U.S.
federal  income tax,  accounting and other  considerations  may be applicable to
instruments such as warrants. The prospectus supplement relating to any issue of
warrants will describe such considerations.

                              PLAN OF DISTRIBUTION

         We may sell the  Securities to or through  underwriters,  through or to
dealers,  directly to one or more purchasers,  or through agents. The prospectus
supplement  with respect to the  Securities  offered  thereby will set forth the
terms of the  offering  of the  Securities,  including  the name or names of any
underwriters,  dealers or agents,  the purchase  price of the Securities and the
proceeds  to  us  from  such  sale,  any  delayed  delivery  arrangements,   any
underwriting discounts and other items constituting underwriters'  compensation,
the initial  public  offering  price,


                                      -9-
<PAGE>

any discounts or concessions  allowed or re-allowed or paid to dealers,  and any
securities exchanges on which the Securities may be listed.

         If  underwriters  are used in the sale, the Securities will be acquired
by the underwriters for their own account and may be resold from time to time in
one or more transactions,  including negotiated transactions,  at a fixed public
offering  price,  at market  prices  prevailing  at the time of sale,  at prices
related to such  prevailing  market prices,  at negotiated  prices or at varying
prices  determined  at the time of sale.  The  Securities  may be offered to the
public  either  through  underwriting  syndicates  represented  by one  or  more
managing underwriters or directly by one or more firms acting as underwriters or
agents.   The  underwriter  or   underwriters   with  respect  to  a  particular
underwritten  offering of Securities will be named in the prospectus  supplement
relating  to such  offering,  and if an  underwriting  syndicate  is  used,  the
managing  underwriter  or  underwriters  will be set  forth on the cover of such
prospectus  supplement.  Unless otherwise set forth in the prospectus supplement
relating thereto,  the obligations of the underwriters or agents to purchase the
Securities will be subject to conditions  precedent and the underwriters will be
obligated  to purchase  all the  Securities  if any are  purchased.  The initial
public offering price and any discounts or concessions  allowed or re-allowed or
paid to dealers may be changed from time to time.

         If dealers  are used in the sale of  Securities  with  respect to which
this  prospectus  is delivered,  we will sell such  Securities to the dealers as
principals. The dealers may then resell such Securities to the public at varying
prices to be determined by such dealers at the time of resale.  The names of the
dealers  and the terms of the  transaction  will be set forth in the  prospectus
supplement relating thereto.

         We may sell Securities  directly or through agents from time to time at
fixed prices, at market prices prevailing at the time of sale, at prices related
to such  prevailing  market  prices,  at negotiated  prices or at varying prices
determined at the time of sale.  Any agent  involved in the offer or sale of the
Securities with respect to which this prospectus is delivered will be named, and
any commissions payable by us to such agent will be set forth, in the prospectus
supplement  relating  thereto.  Unless  otherwise  indicated  in the  prospectus
supplement, any such agent will be acting on a best efforts basis for the period
of its appointment.

         In connection with the sale of the  Securities,  underwriters or agents
may receive  compensation from us or from purchasers of Securities for whom they
may  act as  agents  in the  form of  discounts,  concessions,  or  commissions.
Underwriters,  agents, and dealers participating in the distribution of the debt
securities  may be deemed to be  underwriters,  and any discounts or commissions
received by them from us and any profit on the resale of the  Securities by them
may be deemed to be underwriting  discounts or commissions  under the Securities
Act.

         If so indicated in the prospectus supplement, we will authorize agents,
underwriters, or dealers to solicit offers from certain types of institutions to
purchase  Securities  from us at the  public  offering  price  set  forth in the
prospectus  supplement  pursuant to delayed  delivery  contracts  providing  for
payment and delivery on a specified  date in the future.  Such contracts will be
subject only to those conditions set forth in the prospectus supplement, and the
prospectus  supplement will set forth the commission payable for solicitation of
such contracts.

         Agents,  dealers,  and  underwriters  may be entitled under  agreements
entered into with us to indemnification by us against certain civil liabilities,
including  liabilities under the Securities Act, or to contribution with respect
to payments that such agents,  dealers,  or underwriters may be required to make
with respect  thereto.  Agents,  dealers,  and underwriters may be customers of,
engage in transactions  with, or perform  services for us in the ordinary course
of business.

         Some of our  stockholders  may sell shares of our common stock pursuant
to this prospectus.  If these stockholders elect to sell shares of common stock,
we will provide the selling stockholder  information required by Item 507 of SEC
Regulation S-K in the prospectus supplement.

                                      -10-
<PAGE>

         The  Securities  may or may  not be  listed  on a  national  securities
exchange or the Nasdaq Stock Market.

                                 LEGAL MATTERS

         The validity of the  Securities  will be passed upon by Wilson  Sonsini
Goodrich & Rosati, P.C., Palo Alto, California.

                                    EXPERTS

         Ernst & Young LLP, independent auditors,  have audited our consolidated
financial statements and schedule included in our Annual Report on Form 10-K for
the year ended January 3, 1999,  as set forth in their  report,  which as to the
three  years  ended  January  3,  1999 is based in part on the  reports  of Chuo
Corporation,  independent  auditors,  and which is  incorporated by reference in
this prospectus and elsewhere in the registration statement. The report of Ernst
& Young LLP contains an explanatory  paragraph describing  conditions that raise
substantial  doubt about our ability to continue as a going concern as described
in Note 1 to the consolidated financial statements. Our financial statements are
incorporated  by reference in reliance on Ernst & Young LLP's  report,  given on
their authority as experts in accounting and auditing.

                                      -11-
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

         The following  table sets forth the expenses  (other than  underwriting
discounts and  commissions),  which,  other than the SEC  registration  fee, are
estimates,  payable by the Company in connection with the sale and  distribution
of the securities registered hereby:

                   SEC registration fee ................      $41,700
                   Printing expenses ...................      $
                   Blue Sky fees and expenses ..........      $
                   Trustee's fees and expenses .........      $
                   Accountants' fees and expenses ......      $
                   Legal fees and expenses .............      $
                   Miscellaneous .......................      $
                           Total .......................      $

Item 15.  Indemnification of Directors and Officers

         The Registrant's Restated Certificate of Incorporation provides that no
director of the Registrant will be personally liable to the Registrant or any of
its  stockholders  for monetary  damages  arising from the director's  breach of
fiduciary  duty.  However,  this  provision  does not apply with  respect to any
action in which the director would be liable under Section 174 of Title 8 of the
General  Corporation  Law of  Delaware,  nor does it apply  with  respect to any
liability  resulting from any transaction in which the director (i) breached his
duty of loyalty to the Registrant or its stockholders;  (ii) did not act in good
faith or, in failing to act, did not act in good faith;  (iii) acted in a manner
involving intentional misconduct or a knowing violation of law or, in failing to
act, acted in a manner involving  intentional  misconduct or a knowing violation
of law; or (iv) derived an improper personal benefit.

         Pursuant  to the  provisions  of Section  145 of the  Delaware  General
Corporation  Law, every Delaware  corporation  has power to indemnify any person
who was or is a party or is  threatened  to be made a party  to any  threatened,
pending or completed  action,  suit or proceeding (other than an action by or in
the  right  of the  corporation)  by  reason  of the  fact  that  he is or was a
director,  officer,  employee or agent of the Registrant or of any  corporation,
partnership,  joint  venture,  trust or other  enterprise for which he is or was
serving in such capacity at the request of the  Registrant,  against any and all
expenses,  judgments,  fines  and  amounts  paid in  settlement  and  reasonably
incurred by him in connection with such action, suit or proceeding. The power to
indemnify  applies  only if such  person  acted in good faith and in a manner he
reasonably  believed  to be in the best  interests,  or not  opposed to the best
interests,  of the  corporation,  and with  respect  to any  criminal  action or
proceeding, had no reasonable cause to believe his conduct was unlawful.

         The power to indemnify applies to actions brought by or in the right of
the  corporation  as well,  but only to the  extent of  defense  and  settlement
expenses and not to any  satisfaction  of a judgment or  settlement of the claim
itself,  and with the further limitation that in such actions no indemnification
shall be made in the  event of any  adjudication  of  negligence  or  misconduct
unless  the  court,  in its  discretion,  feels  that  in the  light  of all the
circumstances indemnification should apply.


                                      II-1
<PAGE>

         To the extent any of the  persons  referred  to in the two  immediately
preceding  paragraphs is  successful  in the defense of the actions  referred to
therein,  such  person is,  pursuant  to  Section  145 of the  Delaware  General
Corporation Law,  entitled to  indemnification  as described above.  Section 145
also grants power to advance litigation  expenses upon receipt of an undertaking
to repay such advances in the event no right to  indemnification is subsequently
shown. A corporation may also obtain  insurance at its expense to protect anyone
who might be indemnified, or has a right to insist on indemnification, under the
statue.

         The Registrant  has entered into  indemnification  agreements  with its
directors and officers which provide for  indemnification  to the fullest extent
permitted by Delaware General Corporation Law, including Section 145 thereof.

         Agents,  dealers,  and  underwriters  may be entitled under  agreements
entered into with us to indemnification by us against certain civil liabilities,
including  liabilities under the Securities Act, or to contribution with respect
to payments that such agents,  dealers,  or underwriters may be required to make
with respect  thereto.  Agents,  dealers,  and underwriters may be customers of,
engage in transactions  with, or perform  services for us in the ordinary course
of business.

Item 16.  Exhibits

See Exhibit Index.

Item 17.  Undertakings

The undersigned registrant hereby undertakes:

         (1)      To file,  during any period in which offers or sales are being
made, a post-effective amendment to this registration statement:

                  (i)      To  include  any   prospectus   required  by  Section
                           10(a)(3) of the Securities Act of 1933;

                  (ii)     To  reflect  in the  prospectus  any  facts or events
arising after the  effective  date of this  registration  statement (or the most
recent post-effective amendment hereof) which, individually or in the aggregate,
represent a fundamental change in the information set forth in this registration
statement.  Notwithstanding the foregoing, any increase or decrease in volume of
securities  offered (if the total dollar value of  securities  offered would not
exceed that which was  registered) and any deviation from the low or high end of
the estimated  maximum offering range may be reflected in the form of prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume and price  represent  no more than a 20% change in the maximum
aggregate  offering price set forth in the  "Calculation  of  Registration  Fee"
table in the effective registration statement.

                  (iii)    To include any material  information  with respect to
the plan of distribution not previously disclosed in this registration statement
or any material change to such information in this registration statement;

provided,  however,  that  paragraphs  (1)(i)  and  (1)(ii)  do not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in periodic  reports  filed with or  furnished to the
Commission  by the  registrant  pursuant  to Section 13 or Section  15(d) of the
Securities  Exchange  Act of 1934  that are  incorporated  by  reference  in the
registration statement.


                                      II-2
<PAGE>

         (2)      That, for the purpose of determining  any liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3)      To  remove  from  registration  by means  of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

         (4)      The  undersigned   registrant   hereby  undertakes  that,  for
purposes of determining  any liability  under the  Securities Act of 1933,  each
filing of the  registrant's  annual report  pursuant to Section 13(a) or Section
15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee  benefit  plan's annual  report  pursuant to Section 15(d) of the
Securities  Exchange  Act of 1934) that is  incorporated  by  reference  in this
registration  statement  shall  be  deemed  to be a new  registration  statement
relating to the securities  offered herein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (5)      Insofar as indemnification  for liabilities  arising under the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the registrant  pursuant to the foregoing  provisions,  or otherwise,
the  registrant  has been  advised  that in the  opinion of the  Securities  and
Exchange  Commission such  indemnification is against public policy as expressed
in the Act and is,  therefore,  unenforceable.  In the  event  that a claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

         (6)      The undersigned registrant hereby undertakes that:

                  (1)      For purposes of determining  any liability  under the
Securities  Act of 1933,  the  information  omitted from the form of  prospectus
filed as part of this  registration  statement  in  reliance  upon Rule 430A and
contained  in a form of  prospectus  filed by the  registrant  pursuant  to Rule
424(b)(1) or (4) or 497(h) under the  Securities  Act shall be deemed to be part
of this registration statement as of the time it was declared effective.

                  (2)      For the purpose of  determining  any liability  under
the Securities Act of 1933, each  post-effective  amendment that contains a form
of prospectus shall be deemed to be a new registration statement relating to the
securities  offered  therein,  and the offering of such  securities at that time
shall be deemed to be the initial bona fide offering thereof.

         (7)      The  undersigned  registrant  hereby  undertakes  to  file  an
application for the purpose of determining the eligibility of the trustee to act
under  subsection  (a) of Section 310 of the Trust  Indenture  Act in accordance
with the  rules and  regulations  prescribed  by the  Commission  under  Section
305(b)(2) of the Act.

                                      II-3
<PAGE>

                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of San Jose, State of California, on June 18, 1999.

                                      KOMAG, INCORPORATED

                                      By:  /s/  Stephen C. Johnson
                                           -------------------------------------
                                           Stephen C. Johnson
                                           President and Chief Executive Officer

                               POWER OF ATTORNEY

         KNOW  ALL MEN BY  THESE  PRESENTS  that the  undersigned  officers  and
directors of Komag, Incorporated,  a Delaware corporation,  do hereby constitute
and appoint Stephen C. Johnson and William L. Potts,  Jr., and each of them, the
lawful  attorneys  and agents,  with full power and  authority to do any and all
acts and things and to execute any and all instruments  which said attorneys and
agents, and any one of them, determine may be necessary or advisable or required
to  enable  said  corporation  to comply  with the  Securities  Act of 1933,  as
amended,  and any rules or regulations or  requirements of the SEC in connection
with  this  Registration  Statement.  Without  limiting  the  generality  of the
foregoing  power  and  authority,  the  powers  granted  include  the  power and
authority to sign the names of the  undersigned  officers  and  directors in the
capacities  indicated  below  to  this  Registration  Statement,  to any and all
amendments,  both  pre-effective  and  post-effective,  and  supplements to this
Registration  Statement,  and to any and all  instruments or documents  filed as
part of or in  conjunction  with this  Registration  Statement or  amendments or
supplements  thereof,  and each of the undersigned  hereby ratifies and confirms
all that said attorneys and agents, or any of them, shall do or cause to be done
by virtue hereof. This Power of Attorney may be signed in several counterparts.

                                      II-4
<PAGE>

         IN WITNESS WHEREOF,  each of the undersigned has executed this Power of
Attorney as of the date indicated.
<TABLE>

         Pursuant to the requirements of the Securities Act of 1933, as amended,
this  Registration  Statement has been signed below by the following  persons in
the capacities and on the dates indicated.
<CAPTION>

       Signature                               Title                                 Date
- ----------------------           --------------------------------------          -------------
<S>                              <C>                                             <C>
/s/ Stephen C. Johnson           President, Chief Executive Officer and          June 18, 1999
- -------------------------        Director (Principal Executive Officer)
    Stephen C. Johnson


      /s/ Tu Chen                Chairman of the Board                           June 18, 1999
- -------------------------
          Tu Chen


/s/ William L. Potts, Jr.        Senior Vice President of Finance, Chief         June 18, 1999
- -------------------------        Financial Officer and Secretary
    William L. Potts Jr.         Principal Financial and Accounting
                                 Officer)

    /s/ Chris A. Eyre            Director                                        June 18, 1999
- -------------------------
        Chris A. Eyre


  /s/ Irwin Federman             Director                                        June 18, 1999
- -------------------------
      Irwin Federman


   /s/ George A. Neil            Director                                        June 18, 1999
- -------------------------
       George A. Neil


                                 Director
- -------------------------
      Max Palevsky


/s/ Michael R. Splinter          Director                                        June 18, 1999
- -------------------------
    Michael R. Splinter


    /s/ Anthony Sun              Director                                        June 18, 1999
- -------------------------
        Anthony Sun


/s/ Masayoshi Takebayashi        Director                                        June 18, 1999
- -------------------------
    Masayoshi Takebayashi

</TABLE>

                                      II-5
<PAGE>


                                 EXHIBIT INDEX

Exhibit No.                       Description
- -----------       --------------------------------------------------------------

     1.1*         Form of Underwriting Agreement

     4.1*         Indenture

     4.2*         Form of Note

     4.3*         Certificate of Designations for Preferred Stock

     4.4*         Specimen Certificate Representing shares of Preferred Stock

     4.5*         Depositary Agreement

     4.6*         Specimen Depository Receipt Representing Depositary Shares

     4.7*         Warrant Agreement

     4.8*         Form of Warrant

     5.1*         Opinion of Wilson Sonsini Goodrich & Rosati

     12.1         Statement Regarding  Computation of Ratio of Earnings to Fixed
                  Charges

     23.1         Consent of Ernst & Young LLP, Independent Auditors

     23.2         Consent of Chuo Audit Corporation

     23.3*        Consent of Wilson Sonsini Goodrich & Rosati (see Exhibit 5.1)

     24.1         Powers of Attorney (see signature page)

     25.1*        Statement of Eligibility of Trustee

- ----------------------------
*       To be filed by amendment.




                                                                    Exhibit 12.1
<TABLE>

                                     Computation of Earnings to Fixed Charges
<CAPTION>
                                                             Fiscal Year Ended                      Quarter Ended
                                        ----------------------------------------------------------  -------------
                                           1994        1995        1996        1997         1998    April 4, 1999
                                        ----------  ----------  ---------   ----------   ---------- -------------
<S>                                     <C>         <C>         <C>         <C>          <C>          <C>
Income (loss) before income             $  77,366   $ 135,219   $ 121,148   $ (37,820)   $(338,789)   $ (19,473)
  taxes, minority interest
  and equity in joint venture
  income (loss)

Fixed Charges (1)                           5,524       4,383       3,528      13,944       23,156        6,017

Total earnings and fixed charges        $  82,890   $ 139,602   $ 124,676   $ (23,876)   $(314,318)   $ (13,456)

Fixed Charges (1)                           5,524       4,383       3,528      13,944       23,156        6,017

Ratio of earnings to fixed charges(2)        15.0        31.8        35.3         N/A          N/A          N/A
<FN>
- -------------------

(1)  Fixed charges consist of interest  expense  incurred and the portion of rental expense under operating leases
     deemed by the Company to be representative of the interest factor.

(2)  Earnings were  inadequate to cover fixed charges for fiscal 1997 and 1998 and the quarter ended April 4, 1999
     by approximately $37.8 million, $338.8 million and $19.5 million, respectively.
</FN>
</TABLE>


                                                       II-2



                                                                    Exhibit 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We  consent to the  reference  to our firm under the  caption  "Experts"  in the
Registration Statement (Form S-3) and related Prospectus of Komag,  Incorporated
for the  registration  of its securities and to the  incorporation  by reference
therein of our report dated January 22, 1999,  with respect to the  consolidated
financial statements and schedule of Komag,  Incorporated included in its Annual
Report (Form 10-K) for the year ended January 3, 1999.



                                                   Ernst & Young LLP



San Jose, California
June 18, 1999






                       CONSENT OF INDENPENDENT ACCOUNTANTS

We consent to the  incorporation by reference in the  registration  statement of
Komag,  Incorporated  on Form S-3 of our report  dated  January  22, 1999 on our
audits of the consolidated financial statements of Asahi Komag Co., Ltd. and its
subsidiary  as of December 31, 1998 and 1997,  and for the years ended  December
31, 1998,  1997 and 1996,  which report is included in the Annual Report on Form
10-K of Komag, Incorporated for the year ended December 31, 1998.


                                                    CHUO AUDIT CORPORATION


Tokyo, Japan

June 18, 1999



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