KOMAG INC /DE/
PRES14A, 1998-06-22
MAGNETIC & OPTICAL RECORDING MEDIA
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<PAGE>
 
                            SCHEDULE 14A INFORMATION
                PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                             (AMENDMENT NO.       )

Filed by the Registrant [X]
Filed by a Party other than the Registrant [_]

Check the appropriate box:

[X]  Preliminary Proxy Statement
[_]  Confidential, for use of Commission Only (as permitted by Rule 14a-
     6(e)(2))
[_]  Definitive Proxy Statement
[_]  Definitive Additional Materials
[_]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section
     240.14a-12

                              KOMAG, INCORPORATED
                (Name of Registrant as Specified in its Charter)

                              KOMAG, INCORPORATED
                   (Name of Person(s) Filing Proxy Statement

Payment of Filing Fee (Check the appropriate box):

[X]  No fee required.

[_]  Fee computed on table below per Exchange Act rules 14a-6(i)(4) and 0-11.

     1)   Title of each class of securities to which transaction applies:

     2)   Aggregate number of securities to which transaction applies:

     3)   Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 0-11:

     4)   Proposed maximum aggregate value of transaction:

     5)   Total fee paid:

[_]     Fee paid previously with preliminary materials.

[_]     Check box if any part of the fee is offset as provided by Exchange Act
        Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
        paid previously. Identify the previous filing by registration statement
        number, or the Form or Schedule and date of its filing.

     1)   Amount Previous Paid:

     2)   Form, Schedule or Registration Statement No.:

     3)   Filing Party:

     4)   Date Filed:
<PAGE>
 
                              KOMAG, INCORPORATED
                            1704 AUTOMATION PARKWAY
                          SAN JOSE, CALIFORNIA 95131

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                           TO BE HELD JULY 22, 1998

     A special meeting of stockholders (the "Special Meeting") of Komag,
Incorporated (the "Company") will be held at the offices of the Company, located
at Building 9, 1705 Automation Parkway, San Jose, California, 95131 on
Wednesday, July 22, 1998, at 10:00 a.m. for the following purposes:

1.   To consider and vote upon a proposal to amend the Company's Restated
     Certificate of Incorporation to increase the amount of common stock, par
     value $0.01 (the "Common Stock"), the Company is authorized to issue from
     85 million shares to 150 million shares.

2.   To consider and vote upon a proposal to approve the sale and issuance by
     the Company from time to time of up to $350 million of Common Stock or
     securities convertible into Common Stock in private transactions during the
     next twelve months at a price below book value but at or above the then
     current market price of the Common Stock.

3.   To transact such other business as  may  properly  come  before  the
     Special Meeting  or  any adjournment or postponement thereof.

     The foregoing items of business are more fully described in the Proxy
Statement accompanying this Notice.  Stockholders of record at the close of
business on June 24, 1998 will be entitled to vote at the Special Meeting.  A
list of stockholders entitled to vote at the Special Meeting will be available
for inspection at the offices of the Company.  WHETHER OR NOT YOU PLAN TO ATTEND
THE SPECIAL MEETING IN PERSON, PLEASE SIGN, DATE AND RETURN THE ENCLOSED PROXY
IN THE REPLY ENVELOPE PROVIDED.  If you attend the Special Meeting and vote by
ballot, your proxy will be revoked automatically and only your vote at the
Special Meeting will be counted.  The prompt return of your proxy will assist us
in preparing for the Special Meeting.

     All stockholders are cordially invited to attend the Special Meeting.  A
map to Komag's location is included at the end of the Proxy Statement for
reference.

                              BY ORDER OF THE BOARD OF DIRECTORS

                              Stephen C. Johnson,
                              President and Chief Executive Officer

                              Tu Chen,
                              Chairman of the Board

San Jose, California
June __, 1998
<PAGE>
 
                              KOMAG, INCORPORATED
                            1704 AUTOMATION PARKWAY
                           SAN JOSE, CALIFORNIA 95131

                                PROXY STATEMENT
                    FOR THE SPECIAL MEETING OF STOCKHOLDERS
                            TO BE HELD JULY 22, 1998


                                    GENERAL

     The enclosed proxy is solicited on behalf of the Board of Directors of
Komag, Incorporated, a Delaware corporation (the "Company"), for use at the
special meeting of stockholders to be held on July 22, 1998 and all adjournments
and postponements thereof (the "Special Meeting").  The Special Meeting will
begin at 10:00 a.m. at the offices of the Company, located at Building 9, 1705
Automation Parkway, San Jose, CA 95131.  Stockholders of record on June 24, 1998
(the "Record Date") will be entitled to notice of and to vote at the Special
Meeting.

     This Proxy Statement and accompanying proxy were first mailed to
stockholders on or about June __, 1998.

PURPOSE

     The purpose of the Special Meeting is (i) to consider and vote upon a
proposal to amend the Company's Restated Certificate of Incorporation to
increase the amount of common stock, par value $0.01 (the "Common Stock"), the
Company is authorized to issue from 85 million shares to 150 million shares (the
"Charter Amendment"); (ii) to consider and vote upon a proposal to approve the
sale and issuance by the Company from time to time of up to $350 million of
Common Stock or securities convertible into Common Stock in private transactions
during the next twelve months at a price below book value but at or above the
then current market price of the Common Stock (the "Financing Proposal"); and
(iii) to transact such other business as may properly come before the Special
Meeting.

VOTING, QUORUM, ABSTENTIONS AND BROKER NON-VOTES

     As of the Record Date, there were outstanding ________ shares of Common
Stock.  Each stockholder is entitled to one (1) vote for each share of  Common
Stock  held by such  stockholder. A majority of the issued and outstanding
Common Stock as of the Record Date constitutes a quorum for the Special Meeting.
Abstentions and broker non-votes will be included in determining the presence of
a quorum.

     The affirmative vote of a majority of the Common Stock outstanding as of
the Record Date is required to approve the Charter Amendment.  The affirmative
vote of a majority of all votes cast at the Special Meeting, whether in person
or by proxy, is required to approve the Financing Proposal.  Abstentions 

                                      -1-
<PAGE>
 
and broker non-votes will have the effect of a vote "against" the Charter
Amendment and will have no effect on the outcome of the Financing Proposal.

     Stockholders may vote using the enclosed proxy card or vote by telephone.
The toll-free telephone number and instructions to use the telephone voting
option are included on the proxy card.

REVOCABILITY OF PROXIES

     Any person giving a proxy in written form or by telephone has the power to
revoke it at any time before its exercise.  A proxy may be revoked by filing
with the Secretary of the Company at the Company's principal executive office,
1704 Automation Parkway, San Jose, California, 95131, a notice of revocation or
another signed proxy with a later date.  You may also revoke your proxy by
attending the Special Meeting and voting in person.

SOLICITATION

     The Company will bear the entire cost of solicitation, including the
preparation, assembly, printing and mailing of this Proxy Statement and any
additional soliciting materials furnished to stockholders. Copies of
solicitation materials will be furnished to brokerage houses, fiduciaries and
custodians holding shares in their names that are beneficially owned by others
so that they may forward these solicitation materials to such beneficial owners.
In addition, the Company will reimburse such persons for their costs of
forwarding the solicitation materials to such beneficial owners.  The original
solicitation of proxies by mail may be supplemented by solicitation by
telephone, telegram or other means by directors, officers or employees of the
Company.  No additional compensation will be paid to these individuals for any
such services.  In addition, the Company has retained the firm of Georgeson &
Company Inc. to assist in the solicitation of proxies for a fee of approximately
$15,000, plus expenses.

                                      -2-
<PAGE>
 
                           FORWARD LOOKING STATEMENTS

     This proxy statement contains forward looking statements, which generally
can be identified by the use of words such as "believes," "expects," "may,"
"will," "should," or "anticipates" or comparable terminology or the negative
thereof.  Actual results could differ materially from the results predicted in
such forward looking statements. Factors that could cause actual results to
differ include the following: availability of sufficient cash resources; changes
in the industry supply-demand relationship and related pricing for enterprise
and desktop disk products; timely and successful product qualification of next-
generation products; timely and successful deployment of new process
technologies into manufacturing; utilization of manufacturing facilities;
changes in manufacturing efficiencies, in particular product yields;
extensibility of process equipment to meet more stringent future product
requirements; vertical integration and consolidation within the Company's
limited customer base; increased competition; structural changes within the disk
media industry such as combinations, failures or joint venture arrangements;
availability of certain sole-sourced raw material supplies; and the risk factors
set forth in this Proxy Statement and in the Company's various SEC filings,
including its Form 10-K for the year ended December 28, 1997.  The Company
undertakes 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.

                               COMPANY BACKGROUND

     The Company is a leading component supplier to the data storage industry
and has long been recognized as a technology leader in the media industry.
Throughout much of its corporate history, the Company operated near or at full
capacity. Because the Company historically experienced strong demand and
desired to expand its market share, the Company committed to a capacity
expansion program in late 1995 that significantly increased the Company's
production capabilities by early 1997.

     After reaching peak operational and financial performance in the first half
of 1996, the Company's profitability weakened during the second half of 1996 as
the Company began a transition to magnetoresistive ("MR") products. During this
transition the Company encountered a series of challenges related to the
production of smoother substrates with fewer and smaller defects.  These
production issues depressed product yields during the second half of 1996 and
throughout 1997 despite continuous advancements in the Company's manufacturing
processes.  The Company's profitability improved in the first half of 1997 as
average selling prices rose with the product mix shift toward higher-priced MR
products and unit production costs fell due to incremental improvements in
product yields.  The Company's recovery, however, was halted by a slowdown in
demand for enterprise and desktop media in the second half of 1997.

     During the latter half of 1997 and into 1998, the merchant market for thin-
film disks weakened due to several factors, including: (i) increased supply
within the media industry, which was a result of substantial capacity additions
by captive and independent media suppliers, including the Company; (ii) lower
than expected demand for media products, which was a result of a decline in the
overall growth rate of the data storage industry; (iii) further reductions in
the demand for disk media due to the widespread adoption of MR technology, which
enabled greater disk storage densities and lowered the number of disks 

                                      -3-
<PAGE>
 
per drive; (iv) market share gains by captive media suppliers, which reduced the
size of the merchant market available to independent media suppliers such as the
Company; and, as a result of (i) through (iv) above, (v) significant capacity
underutilization at independent media suppliers, which increased competition and
accelerated price erosion within the merchant market segment.

     As a result of these unfavorable market conditions, the Company has
experienced sharply lower selling prices and several significant reductions in
customer orders that have idled a sizable portion of its production capacity
during the first half of 1998.  Low utilization of the Company's factories
during this period has increased unit production costs substantially as fixed
costs have been spread over fewer production units.  The combination of lower
selling prices and higher unit production costs have contributed to the
Company's actual and expected large losses during the first two quarters of
1998.

     Increased capacity utilization and more stable pricing will depend, in
large measure, on improved market conditions.  To mitigate the negative impact
of current market conditions, the Company has taken steps to reduce its fixed
cost structure and strengthen its competitive position.  To improve internal
production yields and enhance product performance, the Company is currently
deploying new substrate and sputtering technologies.  Internal production yields
are beginning to show measurable improvement as the new polished substrate
process is introduced into production.  The new sputtering process has supported
the development of advanced high density products that have been favorably
received by customers.

     Despite current difficult market conditions, management believes that the
underlying strong growth of the data storage industry will restore equilibrium
between the supply of and the demand for disk media. Management also believes
that the Company's investment in research and development has resulted in
process technologies that will support several new generations of higher density
disk products. Through cost-effective, differentiated products the Company
expects to stimulate demand for its product offerings. The Company is taking
actions to meet its needs through financially restructuring and expects to raise
additional funding to support its position as a leading media supplier.

 
RECENT EVENTS

     JUNE 2, 1998 PRESS RELEASE.  As previously announced in its June 2, 1998
press release, at the beginning of the second quarter, the Company had
anticipated that its net sales would rebound sharply from the $76.1 million
recorded in the first quarter of 1998 into the $100-125 million range.  As
announced, several customers lowered their orders for the Company's disk
products in response to downward adjustments in their hard disk drive production
build schedules. As a result, the Company announced that it expects second
quarter net sales to be in the $75-85 million range. Excluding the one-time
charge described below, the Company announced that it expects to post a net loss
in the second quarter similar in magnitude to the $58 million net loss recorded
in the first quarter of 1998.

     As announced in the June 2, 1998 press release, changes in customer demand
and the Company's belief that the media industry's supply/demand imbalance will
extend into 1999 caused the Company to adjust its expectations for the
utilization of its installed production capacity. In light of these changed

                                      -4-
<PAGE>
 
expectations, the Company announced that it would reduce the carrying value of
its assets as described below. Additionally, the Company announced that it will
limit its capital expenditures in the second half of 1998 to approximately $15
million, thus resulting in capital expenditures of approximately $100 million
for fiscal 1998 instead of the $120 million originally budgeted.

     The Company also announced on June 2, 1998 that it will record a one-time
charge to earnings of $135-185 million in the second quarter ending June 28,
1998. The cash component of the charge is estimated to be approximately 5-10% of
the total charge. The second quarter charge is composed of an impairment charge
that effectively reduces asset valuations to reflect the economic effect of
recent industry price erosion for disk media and the projected underutilization
of the Company's production equipment and facilities. The one-time charge also
includes provisions for facility closure expenses and severance-related costs.
As announced, the Company plans to reduce its U.S. and Malaysian workforce of
4,800 employees by approximately 10% through attrition and a reduction in force.

     Previously, in the third quarter of 1997, the Company recorded a
restructuring charge of $52 million for the consolidation of its U.S.
manufacturing operations, including closure of two plants and a reduction in
force of approximately 330 people, or 16% of its U.S. workforce.

     LIQUIDITY.  As of May 24, 1998, the Company had $165 million in cash and
investments. The Company stated in its June 2, 1998 press release that the size
of the Company's expected second quarter net loss would result, unless cured, in
a technical default under certain profitability and tangible net worth covenants
in the Company's senior unsecured bank credit facilities at the end of the
second quarter on June 28, 1998. The Company currently has $260 million of
borrowings outstanding under the facilities. While the loan commitments under
these facilities total $345 million, the Company does not expect that it will be
able to access the remaining $85 million under the facilities due to the pending
default.

     The Company is currently negotiating with various bank groups either for
amendments to its existing credit facilities or for a new facility or facilities
to replace its existing credit lines.  The Company anticipates that any bank
credit arrangements would likely require the Company to pay additional fees for
the arrangement of the facility and higher interest rates on borrowed funds. The
amended or new credit facilities may also require the Company to provide
collateral as security for borrowings and/or may require the Company to issue
warrants to purchase Common Stock to the lenders. In addition, any new or
amended credit facility may be subject to the completion of a financing
transaction that would provide additional funding to the Company. Any amended
facility may also require the Company to repay a portion of the outstanding
balance under its existing credit facilities from the proceeds of any
financing transaction. If the Company is unable to reach agreement with its
existing lenders or replace its existing credit facilities, the Company's
current lenders will, after June 28, 1998, have the right to accelerate and
require the repayment of all amounts due under the facilities. There can be no
assurance that the Company and lenders will successfully reach a definitive
agreement to amend or replace the Company's existing loan agreements.

     OPTION REPRICING.  The Company's Board of Directors has authorized the
repricing of outstanding stock options held by all employees, including
executive officers, to the current market price of the 

                                      -5-
<PAGE>
 
Common Stock. Options held by nonemployee directors will not be repriced. The
Company's employees, including executive officers, hold options to purchase
approximately 8.3 million shares of Common Stock at exercise prices ranging from
$7.06 to $34.13 per share. The weighted average exercise price of these options
is approximately $15.19 per share. On June 18, 1998, the last sale price of the
Company's Common Stock on The Nasdaq Stock Market was $6.16. The Board of
Directors believes that the current price of the Common Stock is attributable,
in large part, to adverse industry conditions. In addition, the Board believes
that the Company's future performance is dependent in large part on the skills,
capabilities and efforts of the Company's employees, especially the key
management and technical employees who hold the greatest number of options.
Given the disparity between the exercise prices of outstanding options and the
recent trading prices, the Board believes that current options have little value
for retention and motivation of employees and, therefore, believes it is in the
best interests of the Company and its stockholders that the options be repriced.

     In October 1997, the Company exchanged options to purchase 1,806,000 shares
of Common Stock at prices ranging from $19.75 to $36.00 per share for options
with an exercise price of $19.44 per share, which was the fair market value of
the Common Stock at that time. This earlier option exchange program was not
available to the Company's executive officers or nonemployee directors of the
Company.

                     _____________________________________

          Given the Company's current financial situation, the Board of
Directors believes that it is advisable and in the best interests of the Company
and its stockholders to amend the Company's Restated Certificate of
Incorporation to increase the amount of Common Stock the Company is authorized
to issue from 85 million shares to 150 million shares and to seek stockholder
authorization for the Company to sell and issue from time to time up to $350
million of Common Stock or securities convertible into Common Stock in private
transactions during the next twelve months at a price below book value but at or
above the then current market price of the Common Stock. Each of these proposals
is discussed more fully below.

                                      -6-
<PAGE>
 
                      PROPOSAL NO. 1:  CHARTER AMENDMENT

     On June 12, 1998, the Board of Directors adopted, subject to stockholder
approval at the Special Meeting, a proposal to amend the Company's Restated
Certificate of Incorporation, which will increase the amount of capital stock
the Company is authorized to issue from 86,000,000 to 151,000,000 shares by
increasing the amount of Common Stock the Company is authorized to issue from 85
million shares to 150 million shares (the "Charter Amendment"). The Charter
Amendment will have no effect on the amount of Preferred Stock the Company is
authorized to issue.  The text of the proposed amendments to the Restated
Certificate of Incorporation are set forth as Exhibit A to this Proxy Statement.

     As of the Record Date,  _______ shares of Common Stock were outstanding and
an additional _________ shares were reserved for issuance upon the exercise of
options granted under the Company's stock option plans and exercise of awards
under the Company's employee stock purchase plan.  After taking into effect the
shares reserved for issuance, as of the Record Date, the Company had
approximately ______shares of Common Stock available for issuance.

     The Board believes that it is advisable to increase the number of
authorized shares. As discussed more fully in "Company Background" above, the
Company is currently considering several possible financing transactions,
including the sale and issuance of Common Stock in equity and/or equity-linked
private financing transactions as described under "Proposal No. 2:  Financing"
below.  Without approval of the Charter Amendment, the Company will be
constrained in the amount of capital that it can raise in these types of
transactions due to limitations on the number of shares of Common Stock
available for such transactions.

     In addition, the Charter Amendment, if approved by stockholders at the
Special Meeting, will provide the Company with flexibility by assuring the
availability of sufficient authorized but unissued Common Stock for valid
corporate purposes such as stock-based employee benefit plans, financings, stock
dividends and acquisitions. If the Charter Amendment is approved at the Special
Meeting, the newly authorized Common Stock will be available for issuance
without further action by stockholders except as required by law or applicable
requirements of The Nasdaq Stock Market or such successor markets on which the
Common Stock may be traded.

     The Board of Directors may use such additional authorized shares to
discourage persons from attempting to gain control of the Company without prior
negotiation with the Board of Directors. For example, additional shares could be
used to dilute the voting power of shares then outstanding or issued to persons
who would support the Board of Directors in opposing a hostile takeover bid or
solicitation in opposition to management. Management is not currently aware of
any effort to obtain control of the Company by means of a merger, tender offer,
proxy solicitation in opposition or otherwise.

THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE "FOR" THE CHARTER
AMENDMENT. ABSTENTIONS AND BROKER NON-VOTES WILL HAVE THE EFFECT OF A VOTE
"AGAINST" THE CHARTER AMENDMENT. EXECUTED BUT UNMARKED PROXIES WILL BE VOTED
"FOR" THE CHARTER AMENDMENT.

                                      -7-
<PAGE>
 
                          PROPOSAL NO. 2:  FINANCING

     The Company is seeking authorization from stockholders to sell and issue 
up to $350 million of Common Stock in equity or equity-linked private
transactions from time to time during the next twelve months at a price below
book value but at or above the then current market value as defined by the
National Association of Securities Dealers, Inc. (the "NASD") of the Common
Stock (the "Financing Proposal").

     Under the Delaware General Corporation Law and the Company's Restated
Certificate of Incorporation and Bylaws, no action or authorization by the
Company's stockholders is necessary for the Financing Proposal. However, because
the Common Stock is quoted on The Nasdaq Stock Market, the Company is subject to
the rules of the NASD.  NASD Rule 4460(i) generally requires stockholder
approval for the issuance by a company of shares of its common stock (or
securities convertible into or exercisable for common stock) equal to 20% or
more of the voting power of all shares of the company if such shares are sold in
a transaction other than a public offering at a price (or with a conversion
price of) less than the greater of book value or market value of such company's
common stock.  Approval of the Financing Proposal would not limit the Company
from taking any action for which stockholder approval is not otherwise required.

     If the Financing Proposal is approved at the Special Meeting and if the 
Company issues securities in a transaction subject to approval under Rule 
4460(i), then the Company will mail to stockholders certain information about 
the transaction prior to issuing the securities.

     The market price of the Common Stock has been highly volatile in recent
periods as set forth under "Price Range of Common Stock" below.  If the
Financing Proposal is approved at the Special Meeting, the Company will be
authorized to issue up to $350 million of Common Stock in equity or equity-
linked private transactions from time to time during the next twelve months at a
price below book value but at or above the then current market value of the
Common Stock. At June 18, 1998 and March 28, 1998, the closing prices of the
Common Stock on The Nasdaq Stock Market were $6.16 and $14.56, respectively. On
a pro forma basis, giving effect to the range of the restructuring/impairment
charges but without giving effect to the Company's expected second quarter loss,
the book value per share of Common Stock would range from $8.35 to $9.30.

     If stockholders approve the Financing Proposal at the Special Meeting, no
further authorization by stockholders for the issuance of securities pursuant to
this authorization will be obtained.  The terms of the securities to be
authorized, including dividend or interest rates, conversion prices, voting
rights, redemption prices, maturity dates and similar matters will be determined
by the Board of Directors.

RISK FACTORS

IN ADDITION TO THE OTHER INFORMATION SET FORTH IN THIS PROXY STATEMENT,
STOCKHOLDERS SHOULD CAREFULLY CONSIDER THE FOLLOWING FACTORS BEFORE ACTING ON
THE FINANCING PROPOSAL.

DILUTION TO EXISTING STOCKHOLDERS; IMPACT ON MARKET VALUE OF COMMON STOCK

     The sale of a significant amount of Common Stock or securities convertible
into Common Stock could cause substantial dilution to the voting power, earnings
per share and interests of current 

                                      -8-
<PAGE>
 
stockholders. In addition, the sale of a significant number of securities
convertible into shares of Common Stock could cause a decline in the market
value of the Common Stock.

CONSEQUENCES IF THE FINANCING PROPOSAL IS NOT APPROVED

     If the Financing Proposal is not approved by the Company's stockholders at
the Special Meeting, the consequences could have a material adverse effect on
the Company's business, results of operations and financial condition. The
Company is considering sources of funding, including equity or equity-linked
financings that are dependent, in part, on approval of the Financing Proposal.
The Company is also currently negotiating with various bank groups to amend or
replace its existing credit facilities. Any new or amended credit facility may
be subject to the completion of a financing transaction that would provide
additional funding to the Company. The Company has not yet selected a course of
action from among the available financing options nor has the Company received
firm commitments for any such options. Accordingly, there can be no assurance
that any such funding can be arranged. Should the stockholders fail to approve
the Financing Proposal, or should the Company otherwise be unable to obtain
adequate funding, the Company may not have sufficient funds in the future to
maintain the current scope of its business operations. If such was the case
the Company could be required to further reduce or suspend operations, seek a
merger partner, or sell securities on less favorable terms than those
currently available to the Company.

THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE "FOR" THE FINANCING
PROPOSAL. ABSTENTIONS AND BROKER NON-VOTES WILL HAVE NO EFFECT ON THE OUTCOME OF
THE FINANCING PROPOSAL. EXECUTED BUT UNMARKED PROXIES WILL BE VOTED "FOR" THE
FINANCING PROPOSAL.


                          PRICE RANGE OF COMMON STOCK

     The Common Stock is traded on The Nasdaq Stock Market under the symbol
"KMAG." The following table sets forth the range of high and low closing sales
prices, as reported on The Nasdaq Stock Market.

<TABLE>
<CAPTION>
                                           PRICE RANGE OF COMMON STOCK
                                           ----------------------------
                                               HIGH           LOW
                                           -------------  -------------
<S>                                        <C>           <C>
1996
 First Quarter...........................        33 1/4        23
 Second Quarter..........................        26 9/16       24
 Third Quarter...........................        27            19 3/8
 Fourth Quarter..........................        36            21
1997
 First Quarter...........................        32 7/8        25 13/32
 Second Quarter..........................        35 1/8        16 7/16
 Third Quarter...........................        22 7/16       16 1/8
 Fourth Quarter..........................        21 3/8        14 1/2
1998
 First Quarter...........................        15 5/8        12 1/16
 Second Quarter (through June __, 1998)..        15 1/2
</TABLE>

                                      -9-
<PAGE>
 
                              BENEFICIAL OWNERSHIP

  The following table sets forth certain information known to the Company
regarding the ownership of the Common Stock per Schedule 13G filings prior to
the Record Date for all persons who are known to be beneficial owners of five
percent or more of the Common Stock.

SIGNIFICANT STOCKHOLDERS

<TABLE>
<CAPTION>
 Name and Address of Beneficial          Amount and Nature of Beneficial Ownership         Percent of
         Owner                                                                                Class
- --------------------------------  ------------------------------------------------------   ----------
<S>                               <C>                                                      <C>
Franklin Resources, Inc.          5,420,485                                                      10.2%
777 Mariners Island Boulevard
San Mateo, CA 94404               (sole voting power and dispositive power as to
                                  5,023,700 shares by Franklin Advisers, Inc.; sole
                                  voting power as to 113,000 shares and sole
                                  dispositive power as to 380,900 shares by Franklin
                                  Advisory Services, Inc.; sole dispositive power as to
                                  15,885 shares by Franklin Management, Inc. per
                                  February 14, 1998 Schedule 13G filing)
                                  
Neuberger & Berman, LLC           4,620,024                                                       8.7%
605 Third Avenue
New York, NY 10158-3698           (shared dispositive power as to all shares; sole
                                  voting power as to 2,745,024 of such shares 
                                  and shared voting power as to 1,850,000 shares 
                                  per February 9, 1998 Schedule 13G filing)

Merrill Lynch Asset               4,562,400                                                       8.6%
Management
800 Scudders Mill Road            (shared dispositive power and shared voting power
Plainsboro, NJ 08536              as  to  all such shares per February 14, 1998
                                  Schedule 13G filing)  Note:  The Company believes
                                  that this stockholder disposed of shares subsequent
                                  to this Schedule 13G filing, thereby reducing
                                  ownership to less  than 5% of class.
</TABLE> 

                                      -10-
<PAGE>
 
<TABLE> 
<CAPTION> 

y


 Name and Address of Beneficial          Amount and Nature of Beneficial Ownership         Percent of
         Owner                                                                                Class
- --------------------------------  ------------------------------------------------------   ----------
<S>                               <C>                                                      <C>
Barclays Global Fund Advisors     3,079,463                                                       5.8%
45 Fremont Street
San Francisco, CA 94105           (sole dispositive power as to all shares; sole voting
                                  power as to 3,055,463 of such shares per
                                  February 13, 1998 Schedule 13G filing)  Note:  The
                                  Company believes that this stockholder disposed of
                                  shares subsequent to this Schedule 13G filing,
                                  thereby reducing ownership to less than 5% of class.

Spears, Benzak, Salomon &         2,877,094                                                       5.5%
Farrell, Inc.
127 Public Square                 (sole voting power as to all shares, sole dispositive
Cleveland, OH 44114-1306          power as to 2,873,924 of such shares per
                                  February 13, 1998 Schedule 13G filing)  Note:  The
                                  Company believes that this stockholder disposed of
                                  shares subsequent to this Schedule 13G filing,
                                  thereby reducing ownership to less than 5% of class.
</TABLE>

DIRECTORS AND EXECUTIVE OFFICERS

  The table below indicates the number of shares of the Common Stock
beneficially owned as of the Record Date by directors, the Chief Executive
Officer and each of the four other most highly compensated executive officers
during the fiscal year ended December 29, 1997, and by all directors and
executive officers as a group.  Except as otherwise noted, each person has sole
investment and voting powers with respect to the shares shown as beneficially
owned.  Ownership information is based upon information furnished by the
respective individuals.

<TABLE>
<CAPTION>
                                               SHARES BENEFICIALLY OWNED (12)
                                               ------------------------------
                    NAME                           NUMBER        PERCENTAGE
- -------------------------------------------    --------------   -------------
<S>                                            <C>             <C>
Tu Chen (1)................................           676,791             1.3%

Stephen C. Johnson (2).....................           468,714             *

Craig R. Barrett (3).......................            68,000             *

Chris A. Eyre (3)..........................            47,000             *

Irwin Federman (4).........................            87,871             *

George A. Neil (5).........................            33,000             *

Max Palevsky (3)...........................           112,127             *
</TABLE> 

                                      -11-
<PAGE>
 
<TABLE> 
<CAPTION> 

<S>                                            <C>             <C>
Anthony Sun (3)............................            99,810             *

Masayoshi Takebayashi (6)(7)...............            20,250             *

Willard Kauffman (8).......................           145,871             *

Christopher H. Bajorek (9).................            71,158             *

Fred J. Wiele (10).........................            44,884             *

Executive officers and directors as a group         
(20 persons) (11).........................          2,227,658             4.4%
</TABLE>

- ----------------------------
* Less than 1%

(1)  Includes 185,185 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(2)  Includes 259,650 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(3)  Includes 46,000 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(4)  Includes 16,750 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(5)  Includes 32,000 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(6)  Includes 20,250 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(7)  Excludes shares held by Kobe Steel, Ltd. and Kobe Steel USA Holdings
     Incorporated. Mr. Takebayashi is an Executive Officer of Kobe Precision,
     Incorporated, a wholly-owned subsidiary of Kobe Steel, Ltd., and on such
     basis may be deemed, under the 1934 Act, the beneficial owner of the
     2,000,002 shares beneficially owned by such corporations with shared voting
     and investment power with respect thereto. Mr. Takebayashi disclaims
     beneficial ownership of these shares.

(8)  Includes 103,298 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(9)  Includes 69,584 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.

(10) Includes 43,333 shares subject to options which are currently exercisable
     or which will become exercisable within sixty (60) days after the Record
     Date.  Mr. Wiele resigned as an executive officer of the Company effective
     June 12, 1998.

                                      -12-
<PAGE>
 
(11) Includes 1,146,186 shares subject to options which are currently
     exercisable or which will become exercisable within sixty (60) days after
     the Record Date.

(12) Some of the individuals may share voting power with regard to the shares
     listed herein with their spouses.

                                      -13-
<PAGE>
 
                                 OTHER BUSINESS

     The Board of Directors knows of no other business that will be presented
for consideration at the Special Meeting.  If other matters are properly brought
before the Special Meeting, however, it is the intention of the persons named in
the accompanying proxy to vote the shares represented thereby on such matters in
accordance with their best judgment.


                             STOCKHOLDER PROPOSALS

     Proposals of stockholders that are intended to be presented at the
Company's annual meeting of stockholders to be held in 1999 must be received by
the Company no later than December 31, 1998 in order to be included in the proxy
statement and proxy relating to that meeting.


                                    By Order of the Board of Directors



                                    TU CHEN
                                    Chairman of the Board

                                      -14-
<PAGE>
 
                                                                       EXHIBIT A


                           PROPOSED AMENDMENTS TO THE
                     RESTATED CERTIFICATE OF INCORPORATION
                             OF KOMAG, INCORPORATED
                          ___________________________

              Proposed Additions Are Indicated by Double Underline
                                                  ================
              Proposed Deletions Are Indicated by Single Underline
                                                  ----------------
                          ___________________________

                                    ARTICLE IV

      The Corporation shall be authorized to issue Eighty-Six Million
                                                   ------------------
 (86,000,000) One Hundred Fifty-One Million (151,000,000) shares of capital
 ------------============================================                  
 stock having an aggregate par value of Eight Hundred Sixty Thousand Dollars
                                        ------------------------------------
 ($860,000) One Million Five Hundred Ten Thousand Dollars ($1,510,000).  This
 ---------- ==========================================================       
 Capital Stock shall be divided into two classes, Common Stock and Preferred
 Stock, both classes having a par value.  The authorized Common Stock shall be
 Eighty-Five Million shares (85,000,000) One Hundred Fifty Million (150,000,000)
 --------------------------------------- =======================================
 shares having a par value of one cent ($.01) per share for an aggregate class
 par value of Eight Hundred fifty Thousand Dollars ($850,000) One Million Five
              ----------------------------------------------- ================
 Hundred Thousand Dollars ($1,500,000).  The authorized Preferred Stock shall be
 =====================================                                          
 One Million (1,000,000) shares having a par value of one cent ($.01) per share
 for an aggregate class par value of Ten Thousand Dollars ($10,000).  The Board
 of Directors of the Corporation is hereby empowered (i) to determine the
 preferences, privileges, or restrictions of such Preferred Stock, including
 (but not limited to) the dividend rights and rate, conversion and voting
 rights, redemption rights and the terms and prices thereof (including any
 provision for a sinking fund), or liquidation preferences thereof, if any, (ii)
 to divide the Preferred Stock into different series consisting of any number of
 shares, each series having different rights, provisions, or conditions from any
 other series and (iii) to increase or decrease the number of shares of any
 series so designated, but not below the number of shares of any such series
 then outstanding.  The Corporation is also authorized to issue debentures
 (convertible into the Common Stock or Preferred Stock or non-convertible,
 either with or without voting rights) and/or warrants or options to purchase
 Common Stock or Preferred Stock.
<PAGE>
 
PROXY                                                                   PROXY



                      THIS PROXY IS SOLICITED ON BEHALF OF
                 THE BOARD OF DIRECTORS OF KOMAG, INCORPORATED

    The undersigned hereby appoints STEPHEN C. JOHNSON and TU CHEN, or either of
them, as lawful agents and proxies of the undersigned (with all powers the
undersigned would possess if personally present, including full power of
substitution) to represent and to vote all shares of the Company's capital stock
which the undersigned is entitled to vote at the Company's Special Meeting of
Stockholders on July 22, 1998, and any adjournment or postponements thereof as
follows:

                (Continued, and to be signed on the other side)

                            - FOLD AND DETACH HERE -

1.   Proposal to amend the Company's Restated Certificate of Incorporation to
     increase the amount of Common Stock the Company is authorized to issue from
     85 million shares to 150 million shares (the "Charter Amendment").

     [_]   FOR          [_]  AGAINST            [_]  ABSTAIN

2.   Proposal to approve the sale and issuance by the Company from time to time
     of up to $350 million of Common Stock or securities convertible into Common
     Stock in private transactions during the next twelve months at a price
     below book value but at or above the then current market price of the
     Common Stock (the "Financing Proposal").

     [_]   FOR          [_]  AGAINST            [_]  ABSTAIN

3.   In their discretion, the proxies are authorized to vote upon such other
     business as may properly come before the Special Meeting.

Receipt of the Notice of Special Meeting of Stockholders and Proxy Statement
dated June __, 1998 is hereby acknowledged.  This proxy will be voted as
directed, or if no direction is indicated, will be voted FOR each of the
foregoing proposals.  This proxy may be revoked at any time before it is voted.
The Board of Directors recommends a vote FOR Items 1 and 2.


Dated:  ______________________

Signature(s)_____________________________________

Please sign exactly as shown on your stock certificate and on the envelope in
which this proxy was mailed. When signing as partner, corporate officer,
attorney, executor, administrator, trustee, guardian or in any other
representative capacity, give full title as such and sign you own name as well.
If stock is held jointly, each joint owner should sign.
<PAGE>
 
                            - FOLD AND DETACH HERE -
                                        
CONTROL NUMBER                                             [Komag logo]
[       ]

                               VOTE BY TELEPHONE
                CALL * * TOLL FREE * * ON A TOUCH TONE TELEPHONE

                           CALL ___________--ANYTIME

                    THERE IS NO CHARGE TO YOU FOR THIS CALL

Your telephone vote authorizes the named proxies to vote your shares in the same
         manner as if you marked, signed and returned your proxy card.

 You will be asked to enter a Control Number which is located in the box on the
                            left side of this form.

   OPTION #1: TO VOTE AS THE BOARD OF DIRECTORS RECOMMENDS ON ALL PROPOSALS:
                                    PRESS 1

    WHEN ASKED, PLEASE CONFIRM YOUR VOTE BY PRESSING 1--THANK YOU FOR VOTING

OPTION #2: IF YOU CHOOSE TO VOTE ON EACH PROPOSAL SEPARATELY, PRESS 0. YOU WILL
                            HEAR THESE INSTRUCTIONS:


     Proposal 1: To vote FOR, press 1; AGAINST, press 9; ABSTAIN, press 0

                  The instructions are the same for Proposal 2

   WHEN ASKED, PLEASE CONFIRM YOUR VOTE BY PRESSING 1--THANK YOU FOR VOTING.

             IF YOU VOTE BY TELEPHONE, DO NOT MAIL BACK YOUR PROXY.


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