MEMC ELECTRONIC MATERIALS INC
S-3/A, 1999-03-22
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 22, 1999
    
 
                                            REGISTRATION STATEMENT NO. 333-65973
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                      ------------------------------------
   
                                AMENDMENT NO. 4
    
                                       TO
                                    FORM S-3
 
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
                      ------------------------------------
                        MEMC ELECTRONIC MATERIALS, INC.
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                                                           <C>
                     DELAWARE                                              56-1505767
 (State or other jurisdiction of incorporation or            (I.R.S. employer identification number)
                   organization)
</TABLE>
 
                       501 PEARL DRIVE (CITY OF O'FALLON)
                           ST. PETERS, MISSOURI 63376
                                 (314) 279-5500
              (Address, including zip code, and telephone number,
       including area code, of registrant's principal executive offices)
 
                            HELENE F. HENNELLY, ESQ.
                           CORPORATE VICE PRESIDENT,
                         GENERAL COUNSEL AND SECRETARY
                        MEMC ELECTRONIC MATERIALS, INC.
                       501 PEARL DRIVE (CITY OF O'FALLON)
                           ST. PETERS, MISSOURI 63376
                                 (314) 279-5500
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
 
                        COPIES OF ALL CORRESPONDENCE TO:
 
<TABLE>
<S>                                                    <C>
               R. Randall Wang, Esq.                                 Patrick A. Pohlen, Esq.
             Peter D. Van Cleve, Esq.                                 Brett D. White, Esq.
                  Bryan Cave LLP                                       Cooley Godward LLP
              One Metropolitan Square                                 Five Palo Alto Square
            211 N. Broadway, Suite 3600                                3000 El Camino Real
          St. Louis, Missouri 63102-2750                               Palo Alto, CA 94306
                  (314) 259-2000                                         (650) 843-5000
</TABLE>
 
     Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration Statement becomes effective.
 
     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 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, 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. [ ]
                      ------------------------------------
 
     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 of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
   
PROSPECTUS
    
   
    
 
   
                               13,628,446 SHARES
    
                     [MEMC ELECTRONIC MATERIALS, INC. LOGO]
                        MEMC ELECTRONIC MATERIALS, INC.
 
                                  COMMON STOCK
 
                            ------------------------
 
   
     MEMC is distributing to each of its stockholders, other than members of its
majority stockholder group, rights to purchase MEMC common stock. Each right
entitles the holder to purchase one share of MEMC common stock, plus a portion
of any shares remaining if not all of the rights are exercised.
    
 
                            ------------------------
 
     MEMC common stock trades on the New York Stock Exchange under the symbol
"WFR." We have applied to list the rights on the NYSE under the symbol "WFRRT."
We cannot assure you that an active trading market will develop or be maintained
for the rights.
                            ------------------------
 
   
     INVESTING IN MEMC COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. SEE "RISK
FACTORS" BEGINNING ON PAGE 8.
    
 
                            ------------------------
   
                       SUBSCRIPTION PRICE $6.89 PER SHARE
    
                            ------------------------
 
   
<TABLE>
<CAPTION>
                                                    DEALER MANAGER        OFFERING
                               PUBLIC OFFERING    FEES AND ESTIMATED     PROCEEDS TO
                                    PRICE         REIMBURSED EXPENSES       MEMC
                               ---------------    -------------------    -----------
<S>                            <C>                <C>                    <C>
Per Share..................         $6.89                $.14               $6.75
Total......................      $93,900,000          $1,970,000         $91,930,000
</TABLE>
    
 
   
     See "Plan of Distribution" beginning on page 54 for information relating to
fees and reimbursed expenses we will pay to the dealer managers.
    
 
     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.
                            ------------------------
 
                                Dealer Managers
 
NATIONSBANC MONTGOMERY SECURITIES LLC                          J.P. MORGAN & CO.
 
   
                                 March 22, 1999
    
<PAGE>   3
 
                 QUESTIONS & ANSWERS ABOUT THE RIGHTS OFFERING
 
WHAT IS THE RIGHTS OFFERING?
 
   
     The rights offering is a distribution of rights on a pro rata basis to all
of our stockholders other than VEBA Corporation and its affiliates. We are
distributing .715 rights for every share of MEMC common stock held on March 22,
1999.
    
 
WHAT IS A RIGHT?
 
   
     Each right entitles stockholders to purchase one share of MEMC common stock
at a subscription price of $6.89 per share. Each right carries with it a basic
subscription privilege and an over-subscription privilege.
    
 
WHAT IS THE BASIC SUBSCRIPTION PRIVILEGE?
 
   
     The basic subscription privilege of each right entitles you to purchase one
share of MEMC common stock for $6.89, the subscription price.
    
 
WHAT IS THE OVER-SUBSCRIPTION PRIVILEGE?
 
   
     The over-subscription privilege of each right entitles you, if you fully
exercise your basic subscription privilege, to subscribe for additional shares
of MEMC common stock at the same subscription price of $6.89 per share.
    
 
WHAT ARE THE LIMITATIONS ON THE OVER-SUBSCRIPTION PRIVILEGE?
 
   
     We will be able to satisfy your exercise of the over-subscription privilege
only if rights holders subscribe for less than a total of 13,628,446 shares. If
sufficient shares are available, we will honor the over-subscription requests in
full. If over-subscription requests exceed the shares available, we will
allocate the available shares pro rata among those who over-subscribed.
    
 
WHAT SHOULD I DO IF I WANT TO PARTICIPATE IN THE RIGHTS OFFERING BUT MY SHARES
ARE HELD IN THE NAME OF MY BROKER OR A CUSTODIAN BANK?
 
     If you hold shares of MEMC common stock through a broker, dealer or other
nominee, we will ask your broker, dealer or nominee to notify you of the rights
offering. If you wish to sell or exercise your rights, you will need to have
your broker, dealer or nominee act for you. To indicate your decision with
respect to your rights, you should complete and return to your broker, custodian
bank or other nominee the form entitled "Beneficial Owner Election Form." You
should receive this form from your broker or custodian bank with the other
rights offering materials.
 
WILL I BE CHARGED A SALES COMMISSION OR A FEE IF I EXERCISE MY RIGHTS?
 
   
     No. We will not charge a brokerage commission or a fee to rights holders
for exercising their rights. However, if you exercise your rights through a
broker or nominee, you will be responsible for any fees charged by your broker
or nominee. If you sell your rights through Harris Trust and Savings Bank as
described beginning on page 30, it will not charge you any fees. If you sell
your rights through other means, you will be responsible for any fees arising
from such sale.
    
 
MAY I TRANSFER MY RIGHTS IF I DO NOT WANT TO PURCHASE ANY SHARES?
 
     Yes. The rights are transferable and will be listed for trading on the New
York Stock Exchange until the close of business on the last trading day before
the rights offering expires.
 
HOW MAY I SELL MY RIGHTS?
 
   
     You may contact Harris Trust and Savings Bank if you would like it to sell
your rights for you, as described beginning on page 30. Otherwise, you may try
to sell your rights through normal investment channels. We cannot assure you
that Harris Trust and Savings Bank or others will be able to sell any of your
rights.
    
 
AM I REQUIRED TO SUBSCRIBE IN THE RIGHTS OFFERING?
 
     No.
 
IF I EXERCISE RIGHTS IN THE RIGHTS OFFERING, MAY I CANCEL OR CHANGE MY DECISION?
 
     No. All exercises of rights are irrevocable unless the conditions to VEBA
Corporation's affiliate's obligation to purchase shares after this rights
offering are not satisfied or waived before the time the rights expire. In that
case, you will be able to change your decision and we may extend the date the
rights expire.
 
                                        2
<PAGE>   4
 
IF THE RIGHTS OFFERING IS NOT COMPLETED, WILL MY SUBSCRIPTION PAYMENT BE
REFUNDED TO ME?
 
     Yes. Harris Trust and Savings Bank will hold all funds it receives in
escrow until completion of the rights offering. If the rights offering is not
completed, Harris Trust and Savings Bank will return promptly, without interest,
all subscription payments.
 
WHAT SHOULD I DO IF I HAVE OTHER QUESTIONS?
 
     If you have questions or need assistance, please contact Morrow & Co.,
Inc., the information agent for the rights offering, at:
 
    Morrow & Co., Inc.
    445 Park Avenue, 5th Floor
    New York, NY 10022
    (212) 754-8000
    Toll Free (800) 566-9061
 
    Banks and Brokerage Firms
    Please call (800) 662-5200
 
     For further assistance on how to subscribe for shares, you may also contact
Harris Trust and Savings Bank, the subscription agent for the rights offering,
by mail or telephone at:
 
    Harris Trust and Savings Bank
    c/o Harris Trust Company of New York
    Wall Street Station
    P.O. Box 1010
    New York, New York 10268-1010
    (800) 245-7630
 
   
     FOR A MORE COMPLETE DESCRIPTION OF THE RIGHTS OFFERING, SEE "THE RIGHTS
OFFERING" BEGINNING ON PAGE 25.
    
 
                                        3
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
SUMMARY                       This summary highlights information contained
                              elsewhere in this prospectus. This summary does
                              not contain all of the important information that
                              you should consider before investing in the rights
                              or MEMC common stock. You should carefully read
                              the entire prospectus.
 
INFORMATION ABOUT MEMC        MEMC is a leading worldwide producer of silicon
                              wafers. The silicon wafer is the fundamental
                              building block from which almost all
                              semiconductors are manufactured. Semiconductors
                              are used in virtually all electronic applications,
                              including computers, telecommunications equipment,
                              automobiles, consumer electronics products,
                              industrial automation and control systems, and
                              analytical and defense systems.
 
                              Our principal executive offices are located at 501
                              Pearl Drive (City of O'Fallon), St. Peters,
                              Missouri 63376, and our telephone number is (314)
                              279-5500.
 
   
RISK FACTORS                  A purchase of MEMC common stock involves a high
                              degree of risk. You should read and carefully
                              consider the information set forth under "Risk
                              Factors" beginning on page 8 and the information
                              contained elsewhere in this prospectus.
    
 
NO RECOMMENDATIONS TO
RIGHTS
HOLDERS                       Neither we nor the dealer managers are making any
                              recommendations as to whether or not you should
                              subscribe for MEMC common stock. You should decide
                              whether to subscribe for MEMC common stock based
                              upon your own assessment of your best interests.
 
                              THE RIGHTS OFFERING
 
   
RIGHTS                        We will distribute to each stockholder of record
                              (other than VEBA Corporation and its affiliates)
                              on March 22, 1999, at no charge, .715 transferable
                              subscription rights for every share of MEMC common
                              stock then owned. Because we will not issue
                              fractional rights, we will round up to the nearest
                              whole number the number of rights we distribute to
                              each stockholder. For example, if you own 140
                              shares of MEMC common stock, you will receive 101
                              rights instead of 100.1 rights. The rights will be
                              evidenced by a transferable rights certificate and
                              will entitle the holder to subscribe for shares of
                              MEMC common stock at $6.89 per share pursuant to
                              the basic subscription privilege and
                              over-subscription privilege described on page 25.
    
 
   
RECORD DATE                   March 22, 1999, at 5:00 p.m., New York City time.
    
 
   
EXPIRATION DATE               The rights will expire at 5:00 p.m., New York City
                              time, on April 13, 1999. We may extend the
                              expiration date until May 15, 1999 for any reason.
                              We may extend the expiration date until some later
                              date if our Board of Directors believes that a
                              material event has occurred and we need more time
                              to adequately disclose information about such
                              event to you.
    
 
TERMINATION OF THE RIGHTS
OFFERING                      We may terminate the rights offering prior to the
                              time the rights expire. If we terminate the rights
                              offering, we will promptly return all
 
                                        4
<PAGE>   6
 
                              subscription payments. We will not pay interest
                              on, or deduct any amounts from, subscription
                              payments returned if we terminate the rights
                              offering. Rights that remain unexercised at the
                              expiration time will expire and will no longer be
                              exercisable.
 
   
PROCEDURE FOR EXERCISING
RIGHTS                        You may exercise rights by properly completing and
                              signing your rights certificate. You must deliver
                              to Harris Trust and Savings Bank your rights
                              certificate with payment of the subscription price
                              for each share of MEMC common stock subscribed for
                              (both pursuant to the basic subscription privilege
                              and the over-subscription privilege) on or prior
                              to the date and time when the rights offering
                              expires. If you use the United States mail to send
                              your rights certificate, we recommend that you use
                              insured, registered mail. If you cannot deliver
                              your rights certificate to Harris Trust and
                              Savings Bank on time, you may use the procedures
                              for guaranteed delivery described under "The
                              Rights Offering -- Guaranteed Delivery Procedures"
                              on page 29. We will not pay interest on
                              subscription payments. We have provided more
                              detailed instructions on how to exercise your
                              rights under "The Rights Offering" beginning with
                              the section "-- Exercise of Rights" on page 26 and
                              with the rights certificate and "Instructions For
                              Use of MEMC Electronic Materials, Inc. Rights
                              Certificates" that may accompany this prospectus.
    
 
   
HOW FOREIGN STOCKHOLDERS
AND
STOCKHOLDERS WITH APO OR
FPO
ADDRESSES CAN EXERCISE
RIGHTS                        We will not mail rights certificates to you if you
                              are a stockholder with an address outside the
                              United States or if you have an APO or FPO
                              address. Instead, Harris Trust and Savings Bank
                              will hold rights certificates for your account. To
                              exercise such rights, you must notify Harris Trust
                              and Savings Bank on or prior to 11:00 a.m., New
                              York City time, on April 8, 1999, and establish to
                              the satisfaction of Harris Trust and Savings Bank
                              that your exercise is permitted under applicable
                              law. If you do not notify Harris Trust and Savings
                              Bank and provide acceptable instructions to Harris
                              Trust and Savings Bank by such time (if no
                              contrary instructions are received), Harris Trust
                              and Savings Bank will try to sell your rights, if
                              feasible, and will pay the estimated net proceeds,
                              if any, to you.
    
 
ISSUANCE OF COMMON STOCK      We will issue certificates representing shares of
                              MEMC common stock purchased pursuant to the
                              exercise of rights as soon as practicable after
                              the expiration of the rights offering.
 
CERTAIN FEDERAL INCOME TAX
CONSEQUENCES                  Holders of MEMC common stock who receive rights,
                              more likely than not, will not recognize taxable
                              income in connection with the distribution or
                              exercise of rights. You may recognize a gain or
                              loss upon the sale of rights or shares of MEMC
                              common stock acquired through exercise of the
                              rights.
 
   
VEBA GROUP                    VEBA Corporation, a corporation owned by VEBA AG
                              and its subsidiaries, and VEBA Zweite
                              Verwaltungsgesellschaft mbH ("VEBA Zweite"),
                              another subsidiary of VEBA AG, own 36,890,072
                              shares of MEMC common stock (66.0% of outstanding
                              shares). VEBA Corporation and VEBA Zweite are
                              referred to in this prospectus as the VEBA group.
    
 
   
PRIVATE PLACEMENT TO VEBA
ZWEITE                        On March 22, 1999, we sold 15,399,130 shares of
                              MEMC common stock to VEBA Zweite, at $6.89 per
                              share, for aggregate net proceeds of approximately
                              $105.9 million. The sale increased the VEBA
    
                                        5
<PAGE>   7
 
   
                              group's percentage ownership from approximately
                              53.1% to 66.0% of the outstanding shares.
    
 
REASONS FOR THE RIGHTS
OFFERING                      We are proceeding with the rights offering to
                              raise capital and to allow our stockholders (other
                              than the VEBA group) an opportunity to restore
                              their proportionate interest in MEMC at the same
                              price per share of common stock as was paid by
                              VEBA Zweite. If rights holders (other than the
                              VEBA group) purchase all shares of MEMC common
                              stock offered in the rights offering, the VEBA
                              group will again own approximately 53.1% of the
                              outstanding shares.
 
   
STANDBY AGREEMENT WITH VEBA
ZWEITE                        Although we are not distributing any rights to the
                              VEBA group, VEBA Zweite has agreed to purchase all
                              shares issuable upon exercise of the rights that
                              are not subscribed for pursuant to the basic
                              subscription privilege or the over-subscription
                              privilege by other stockholders, subject to
                              certain conditions that are customary in a firm
                              commitment underwriting. If no other rights
                              holders exercise their rights, VEBA Zweite will
                              purchase all of the shares of MEMC common stock
                              offered in this rights offering, and the VEBA
                              group will own approximately 72.7% of the shares
                              of outstanding MEMC common stock following this
                              rights offering.
    
 
   
USE OF PROCEEDS               We will receive approximately $91.1 million from
                              the rights offering, after paying estimated
                              expenses, including the fees to the dealer
                              managers. We have received approximately $105.9
                              million from the private placement to VEBA Zweite,
                              after paying estimated expenses. We will use the
                              proceeds of the private placement to VEBA Zweite
                              to repay debt from VEBA AG and its affiliates
                              under revolving credit agreements and for general
                              corporate purposes. We will use the proceeds from
                              the rights offering to repay remaining debt from
                              VEBA AG and its affiliates under revolving credit
                              agreements and for general corporate purposes.
    
 
   
COMMON STOCK OUTSTANDING      As of January 31, 1999, we had outstanding
                              40,507,216 shares of MEMC common stock. As of such
                              date, on a pro forma basis giving effect to the
                              private placement to VEBA Zweite, we had
                              outstanding 55,906,346 shares of MEMC common
                              stock. After the private placement, the rights
                              offering and completion of the transactions
                              contemplated by the standby agreement, we will
                              have outstanding approximately 69,534,792 shares
                              of MEMC common stock. These numbers do not include
                              2,418,999 shares issuable upon exercise of
                              employee stock options (as of January 31, 1999)
                              and 730,859 shares available for future grant
                              under our Equity Incentive Plan.
    
 
                           FORWARD-LOOKING STATEMENTS
 
   
     Parts of the information contained or referred to in this prospectus,
including information with respect to possible future cost savings, are
forward-looking statements. For a discussion of important factors that could
cause actual results to differ materially from the forward-looking statements,
see "Risk Factors" beginning on page 8 and "Cautionary Statement Regarding
Forward-Looking Statements" beginning on page 17.
    
 
                                        6
<PAGE>   8
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                   (Dollars in thousands, except share data)
 
     In the table below, we provide you with selected historical consolidated
financial data of MEMC. We prepared this information using the consolidated
financial statements of MEMC as of the dates indicated and for each of the
fiscal years in the five-year period ended December 31, 1998. We adjusted the
December 31, 1998 balance sheet data in two respects. The second column reflects
the estimated net proceeds of $105.9 million from the private placement to VEBA
Zweite after deducting estimated expenses attributed to the private placement
and after application of the net proceeds. The third column reflects estimated
net proceeds of $197.0 million collectively from the private placement to VEBA
Zweite, the consummation of this rights offering, and the transactions
contemplated by the standby agreement, after deducting estimated expenses and
after application of the net proceeds.
 
     We also note the following with respect to the information provided in the
table:
 
     - In 1998, we recorded restructuring costs totaling $146.3 million
       primarily related to closing our Spartanburg, South Carolina facility,
       foregoing construction of an 8-inch (200 millimeter) wafer facility in
       Malaysia, withdrawing from our joint venture participation in the small
       diameter wafer operation in China and implementing a voluntary separation
       program.
 
   
     - Our net earnings in 1994 were affected by the adoption of an accounting
       standard related to postemployment benefits, SFAS No. 112. The effect of
       this change was a charge of $1.3 million.
    
 
   
<TABLE>
<CAPTION>
                                                                              YEAR ENDED DECEMBER 31,
                                                           --------------------------------------------------------------
                                                              1994         1995         1996         1997         1998
                                                           ----------   ----------   ----------   ----------   ----------
<S>                                                        <C>          <C>          <C>          <C>          <C>
STATEMENT OF OPERATIONS DATA:
Net sales................................................  $  660,807   $  886,860   $1,119,500   $  986,673   $  758,916
Gross margin.............................................     143,210      223,279      250,185      124,759      (31,829)
Marketing and administration.............................      41,298       63,893       79,680       70,715       73,515
Research and development.................................      27,403       31,226       44,313       64,457       81,591
Restructuring costs......................................          --           --           --           --      146,324
Operating profit (loss)..................................      74,509      128,160      126,192      (10,413)    (333,259)
Equity in income (loss) of joint ventures................      (6,384)      13,199       26,716        5,480      (43,496)
Net earnings (loss)......................................      34,475       86,564      103,388       (4,513)    (316,332)
Earnings (loss) per share:
  Basic..................................................  $     1.60   $     2.83   $     2.50   $    (0.11)  $    (7.80)
  Diluted................................................        1.60         2.81         2.49        (0.11)       (7.80)
Shares used in earnings (loss) per share computation:
  Basic..................................................  21,490,942   30,612,636   41,308,806   41,345,193   40,580,869
  Diluted................................................  21,490,942   30,838,704   41,534,412   41,345,193   40,580,869
OTHER DATA:
Capital expenditures.....................................  $   78,676   $  215,359   $  590,049   $  372,416   $  194,610
Equity infusions in joint ventures.......................      20,922       29,904       14,698       10,638       25,533
    
 
   
<CAPTION>
                                                                          AT DECEMBER 31, 1998
                                                              ---------------------------------------------
                                                                                          AS ADJUSTED FOR
                                                                                         PRIVATE PLACEMENT,
                                                                           AS ADJUSTED    RIGHTS OFFERING
                                                                           FOR PRIVATE      AND STANDBY
                                                                ACTUAL      PLACEMENT        AGREEMENT
                                                              ----------   -----------   ------------------
<S>                                                           <C>          <C>           <C>
BALANCE SHEET DATA:
Working capital.............................................  $   40,494   $   40,494        $  106,057
Total assets................................................   1,773,714    1,773,714         1,839,277
Long-term debt (including current portion)..................     873,680      767,830           742,280
Stockholders' equity........................................     399,040      504,890           596,003
</TABLE>
    
 
                                        7
<PAGE>   9
 
                                  RISK FACTORS
 
     You should carefully consider the following factors, together with the
other information contained in this prospectus, before purchasing rights or the
MEMC common stock we are offering. An investment in MEMC common stock involves a
high degree of risk and may not be appropriate for investors who cannot afford
to lose their entire investment.
 
WE HAVE HAD SIGNIFICANT OPERATING AND NET LOSSES AND WE ANTICIPATE FUTURE LOSSES
 
   
     We have not reported an operating profit since the third quarter of 1997.
We reported an operating loss in 1997 of $10.4 million. In 1998, we had an
operating loss of $333.3 million, which included restructuring costs of $146.3
million. Due to overcapacity and decreasing prices in the semiconductor and
silicon wafer industries, weak economic conditions in the Asia Pacific region
and Japan, and other factors, we do not expect to be profitable at least through
1999. We cannot predict how long we will continue to experience significant or
increasing operating and net losses or whether we will become profitable.
    
 
WE NEED SUBSTANTIAL CAPITAL INVESTMENTS TO FUND OUR FUTURE OPERATIONS OTHERWISE
WE MAY NOT KEEP PACE WITH OUR COMPETITORS
 
     We will need substantial amounts of cash to continue to fund capital
expenditures, research and development, and marketing and customer service and
support to keep pace with our competitors. Our business is very capital
intensive. Our capital needs depend on numerous factors, including our
profitability and investment in research and development and capital
expenditures. We cannot assure you that, even with the proceeds from this rights
offering, the private placement to, and standby agreement with, VEBA Zweite and
cash flows from operations, if any, we will have enough capital to be able to
fund our future operations. We have incurred negative cash flows from operations
in recent periods.
 
WE MAY NOT BE ABLE TO OBTAIN CAPITAL FROM OTHER PARTIES IN THE FUTURE TO MEET
OUR NEEDS AND MAY BE FORCED TO REDUCE OUR INVESTMENT IN OUR BUSINESS
 
     We cannot assure you that we will be able to obtain capital in the future
to meet our needs. If we cannot obtain additional funding, whether from current
or new lenders or investors, we may be required to reduce our investments in
research and development, marketing and customer service and support and capital
expenditures. Such reductions could materially adversely affect our ability to
compete and our business.
 
     If we do find a source of additional capital, the terms and pricing of any
such financing may be significantly more favorable to the lender or investor
than those in this rights offering. Future capital raising could dilute or
otherwise materially adversely affect the holdings or rights of our existing
stockholders.
 
     Historically, we have funded our operations primarily through loans from
VEBA AG and its affiliates, internally generated funds, and our initial public
offering. To a lesser extent, we have raised funds by borrowing money from
commercial banks. We will continue to explore and, as appropriate, enter into
discussions with other parties regarding possible future sources of capital.
However, under the loan agreements between us and our principal lender, VEBA AG
and its affiliates, we cannot pledge any of our assets to secure additional
financing. We do not believe that we currently can obtain unsecured financing
from third parties on better terms than those with VEBA AG and its affiliates.
 
WE HAVE RELIED ON VEBA AG AND ITS AFFILIATES FOR CAPITAL FUNDING IN THE PAST,
BUT MAY NOT BE ABLE TO RELY ON THEM FOR SUCH FUNDING IN THE FUTURE WHICH MAY
FORCE US TO REDUCE EXPENDITURES
 
     VEBA AG and its affiliates are not obligated to provide capital to us
except in connection with the private placement and standby agreement and under
current loan agreements. We cannot assure you that
                                        8
<PAGE>   10
 
   
VEBA AG and its affiliates will provide additional capital to us in the future.
We may be forced to reduce expenditures if VEBA AG and its affiliates do not
provide us with capital in the future. In such an event, we may not be able to
fund certain capital expenditures, research and development, and marketing and
customer service and support. See "Recent Developments -- Financial
Restructuring Plan" beginning on page 20.
    
 
WE HAVE A SIGNIFICANT AMOUNT OF DEBT THAT WILL ADVERSELY AFFECT OUR ABILITY TO
OBTAIN ADDITIONAL FINANCING
 
     We currently have a significant amount of debt that will adversely affect
our ability to obtain additional financing for working capital, capital
expenditures or other purposes. As of January 31, 1999, we owed $777.0 million
to VEBA AG and its affiliates, and $163.0 million to other lenders. Our debt
service could make us more vulnerable to industry downturns and competitive
pressures. In addition, the cash flow required to service our debt may reduce
our ability to fund internal growth and capital requirements.
 
IF THE SEMICONDUCTOR INDUSTRY DOWNTURN CONTINUES WE WILL FACE INTENSE PRESSURE
TO FURTHER REDUCE PRICES WHICH MAY LEAD TO FURTHER LOSSES
 
     If the current downturn in the semiconductor industry continues, or the
industry experiences other downturns in the future, we will face pressure to
further reduce prices. However, our ability to reduce expenses during a downturn
is limited because of the fixed costs associated with our substantial excess
capacity and continued investment in research and development and marketing
necessary to maintain our extensive worldwide customer service and support
capabilities. If we are unable to reduce our expenses sufficiently to offset the
decline in our prices, our operating results and financial condition could be
materially adversely affected.
 
     Our business depends in large part upon the market demand for our
customers' semiconductors and products utilizing semiconductors. The
semiconductor industry experiences:
 
     -  rapid technological change;
 
     -  product obsolescence;
 
     -  price erosion; and
 
     -  wide fluctuations in product supply and demand.
 
     Recently, the semiconductor industry rapidly expanded its production
capacity, resulting in overcapacity, especially for DRAM (commonly used computer
memory chips). This overcapacity has caused semiconductor prices to decline,
which has depressed semiconductor revenues and profitability.
 
     From time to time the semiconductor industry has experienced significant
downturns and is currently in the midst of such a downturn. These downturns
often occur in connection with, or in anticipation of, maturing product cycles
(of both the semiconductor companies and their "end customers") and declines in
general economic conditions. Some of these downturns have lasted for more than a
year. Also, during such periods, customers of semiconductor manufacturers
benefiting from shorter lead times may delay some purchases of semiconductors
into future periods. The current semiconductor industry downturn began in the
fourth quarter of 1995. The resulting downturn in the silicon wafer industry
began in the summer of 1996.
 
   
     The economic recessions in Japan and in nations in the Asia Pacific region
have made the current downturn in the semiconductor industry worse. The
economies in these regions have contracted, and demand for semiconductors and
silicon wafers in these regions has decreased significantly.
    
 
                                        9
<PAGE>   11
 
SUBSTANTIAL EXCESS CAPACITY AND DECLINING WAFER PRICES LIMIT OUR ABILITY TO
BECOME PROFITABLE
 
     Excess capacity in the silicon wafer industry limits our ability to
maintain or raise prices and could dramatically increase the worldwide supply of
silicon wafers in the future, increase the downward pressure on prices and
materially adversely impact our operating results. The growth in the worldwide
supply of silicon wafers has outpaced the growth in worldwide demand in recent
periods, especially for 8-inch silicon wafers. As a result, the selling prices
for our products have decreased. Because of price decreases and declining
product volume, our revenues are currently insufficient to offset our costs, and
this is adversely affecting our operating results. We have no firm information
with which to determine the capacity and expansion plans of our competitors.
Although some of our competitors have announced plans to slow their capacity
expansion programs, many have already added significant capacity for the
production of 8-inch wafers. We and our competitors have the ability to increase
our production of silicon wafers through unused capacity and our ability to
expand our capacity quickly.
 
OUR DEPENDENCE ON THE SEMICONDUCTOR INDUSTRY CAUSES SUBSTANTIAL FLUCTUATIONS IN
OUR OPERATING RESULTS AND AT TIMES THIS HAS ADVERSELY AFFECTED THE MARKET PRICE
OF MEMC COMMON STOCK
 
     Our quarterly and annual operating results can fluctuate dramatically, and
this can adversely affect the market price of MEMC common stock. The main factor
affecting these fluctuations is our dependence on the performance of the
semiconductor industry, which historically has been cyclical. Another factor is
currency exchange rate volatility, which affects the price we receive for our
wafers and may result in gains or losses on unhedged currency exposure at our
unconsolidated joint ventures.
 
     Our operating results are also affected by:
 
     -  the timing of orders from major customers;
 
     -  product mix;
 
     -  competitive pricing pressures; and
 
     -  the delay between the incurrence of expenses to develop marketing and
       service capabilities and expand capacity and the realization of benefits
       from these expenditures.
 
     Moreover, customers may cancel or reschedule shipments, and production
difficulties could delay shipments. We cannot predict the future impact of any
of these factors. These and other factors could have a material adverse effect
on our quarterly or annual operating results.
 
VEBA AG'S CONTROL OF MEMC COULD PREVENT A FAVORABLE ACQUISITION OF MEMC
 
     VEBA AG's control of MEMC could prevent or discourage any unsolicited
acquisition of MEMC and consequently could prevent an acquisition favorable to
MEMC's other stockholders. After the rights offering, VEBA AG will continue to
have sufficient voting power to control our direction and policies. VEBA AG will
continue to be able to control any merger, consolidation or sale of all or
substantially all of our assets, to elect the members of the Board of Directors
and to prevent or cause a change in control of MEMC. Four of the eight members
of our Board of Directors are employees of VEBA AG or its affiliates, not
including MEMC.
 
     In addition, the VEBA group has advised us that VEBA AG or one of its
affiliates may purchase rights on the New York Stock Exchange during the rights
offering. However, the VEBA group has agreed not to exercise its
over-subscription privilege with respect to any rights. The VEBA group has also
advised us that it may decide to purchase additional shares of MEMC common stock
following the rights offering.
 
                                       10
<PAGE>   12
 
RESTRICTIVE COVENANTS WILL, AND HIGHER INTEREST RATES MAY, APPLY TO MEMC IF VEBA
AG OR ITS AFFILIATES CEASE TO OWN A MAJORITY OF OUR STOCK
 
     Certain of our loan agreements with VEBA AG and its affiliates provide that
if VEBA AG and its affiliates own less than a majority of the outstanding MEMC
common stock on or after January 1, 2001, then the interest rates we pay on our
loans from VEBA AG and its affiliates will be the higher of:
 
     -  the interest rate currently set forth in each such loan agreement; or
 
   
     -  an interest rate determined, as of the later of January 1, 2001 or the
        change of control date, for an average industrial borrower at an assumed
        credit rating based on the remaining term of each such loan agreement.
        See "Recent Developments -- Financial Restructuring Plan -- Debt
        Restructuring" beginning on page 20.
    
 
     In addition, in such an event we will become subject to certain affirmative
covenants set forth in all of our loan agreements with VEBA AG and its
affiliates. These affirmative covenants include requirements that we maintain a
minimum net worth and a minimum amount of working capital. We would also need to
meet certain financial ratios, including a minimum fixed charge coverage ratio
and minimum working capital ratio.
 
     If we had been subject to these covenants as of January 31, 1999, we would
not have been in compliance with all of these covenants. If VEBA AG and its
affiliates own less than a majority of our outstanding common stock at any time
on or after January 1, 2001 and we are then not in compliance with all of these
affirmative covenants, then we would be in default under these loan agreements.
 
   
     If VEBA AG and its affiliates own less than a majority of the outstanding
MEMC common stock, then Taisil Electronic Materials Corporation, our Taiwanese
joint venture, may become obligated to repay certain debt. See "-- We May Have
To Make Substantial Payments In Connection With Our Taisil Joint Venture, And
This Could Divert Funds From Other Needed Areas" on page 13.
    
 
WE EXPERIENCE INTENSE COMPETITION IN THE SILICON WAFER INDUSTRY AND OUR
CUSTOMERS EXPECT CONTINUING TECHNOLOGICAL INNOVATION AT A LOW COST
 
     We face intense competition in the silicon wafer industry from established
manufacturers throughout the world. If we cannot compete effectively with other
silicon wafer manufacturers, our operating results could be materially adversely
affected. Some of our competitors have substantial financial, technical,
engineering and manufacturing resources. We believe that our Japanese
competitors benefit from their dominance of the Japanese market, which
represented approximately 38% of the worldwide silicon wafer market in 1998. In
particular, Shin-Etsu Handotai, the largest supplier of silicon wafers in Japan
and the world, is able to leverage globally its sales and technology base.
 
     We compete principally on the basis of product quality, consistency and
price, as well as technical innovation, customer service and product
availability. We expect that our competitors will continue to improve the design
and performance of their products and to introduce new products with competitive
price and performance characteristics. Competitive pressures may cause
additional price reductions, which could have a material adverse effect on our
operating results.
 
IF WE FAIL TO MAKE SIGNIFICANT INVESTMENTS NECESSARY TO COMPLY WITH CHANGING
SEMICONDUCTOR INDUSTRY CUSTOMER SPECIFICATIONS, WE MAY LOSE CUSTOMERS
 
     If we fail to meet future customer requirements, we could experience a
material adverse effect on our competitive position and operating results. The
silicon wafer industry changes rapidly. Changes include requirements for new and
more demanding technology, product specifications and manufacturing processes.
Our ability to remain competitive will depend upon our ability to develop
technologically advanced products and processes. We must continue to meet the
increasingly demanding requirements of our
 
                                       11
<PAGE>   13
 
customers on a cost-effective basis. As a result, we expect to continue to make
significant investments in research and development. We cannot assure you that
we will be able to successfully introduce, market and cost-effectively
manufacture any new products, or that we will be able to develop new or enhanced
products and processes that satisfy customer needs or achieve market acceptance.
 
WE HAVE A LIMITED NUMBER OF PRINCIPAL CUSTOMERS, AND ACCORDINGLY A LOSS OF ONE
OR SEVERAL OF THOSE CUSTOMERS WOULD HURT OUR BUSINESS
 
   
     Our operating results could materially suffer if we, or our joint ventures,
experience a significant reduction in, or loss of, purchases by one or more of
our top customers. Historically, we have sold a significant portion of our
products to a limited number of principal customers. In 1998, we made over one-
half of our sales to ten customers, with one customer accounting for
approximately 20% of our sales. Likewise, POSCO HULS Co., Ltd. (commonly known
as PHC), our unconsolidated joint venture in Korea, sold over half of its
products to Samsung, one of our partners in that joint venture. We cannot assure
you that we or PHC will realize equivalent sales from our top customers in the
future.
    
 
CURRENCY EXCHANGE RATES AND INCREASED COMPETITION HAVE REDUCED WAFER PRICES AND
HAVE LED TO LOWER MARGINS AND PROFITS
 
     Decreases in wafer prices have lowered our margins and profits. In 1998, we
had a gross margin of negative 4.2%. This negative gross margin was due in part
to the decline of the Japanese yen and the Deutsche mark relative to the U.S.
dollar over the past few years. Recently, the Japanese yen has recovered
moderately relative to the U.S. dollar. The currency declines have given, and
similar currency declines in the future may give, our Japanese and German
competitors significant cost advantages in the marketplace. These currency
pressures, together with the effects of the semiconductor industry downturn and
excess capacity in the silicon wafer industry, as described above, have
increased competition and resulted in significant decreases in wafer prices.
 
WE EXPECT THAT INTERNATIONAL SALES WILL CONTINUE TO REPRESENT A SIGNIFICANT
PERCENT OF OUR TOTAL SALES, AND ACCORDINGLY WE ARE SUBJECT TO PERIODIC FOREIGN
ECONOMIC DOWNTURNS AND FLUCTUATIONS IN FOREIGN CURRENCY EXCHANGE AND INTEREST
RATES
 
     A number of factors in the past have affected adversely, and may affect
adversely in the future, our results of operations and international sales and
operations, including periodic economic downturns and fluctuations in interest
and foreign currency exchange rates.
 
     We expect that international sales will continue to represent a significant
percentage of our total sales. In addition, a significant portion of our
manufacturing operations are located outside of the United States. Sales outside
of the United States expose us to currency exchange rate fluctuations. Our risk
exposure from these sales is primarily limited to the Japanese yen, Deutsche
mark and European euro. Our risk exposure from expenses at international
manufacturing facilities is concentrated in Italian lira, Japanese yen and
Malaysian ringgit. We generally hedge receivables denominated in foreign
currencies at the time of sale. We hedge some foreign currency denominated
intercompany loans by entering into long-dated forward exchange contracts.
However, we cannot predict whether exchange rate fluctuations will have a
material adverse effect on our operations and financial results in the future.
 
     Our unconsolidated joint ventures have sales denominated in the U.S. dollar
and manufacturing expenses primarily denominated in the U.S. dollar, Korean won
and New Taiwanese dollar. PHC also has significant debt denominated in the U.S.
dollar and Korean won. Likewise, Taisil Electronic Materials Corporation, our
unconsolidated Taiwanese joint venture, has significant debt denominated in the
U.S. dollar and New Taiwanese dollar. For U.S. generally accepted accounting
principles, these two unconsolidated joint ventures use the U.S. dollar as their
functional currency and do not hedge net Korean won or New Taiwanese dollar
exposures. We do not hedge our net Korean won exposure, because the
 
                                       12
<PAGE>   14
 
forward contract market is limited for the Korean won and we do not believe the
prices of such contracts are attractive. To date, we have not hedged net New
Taiwanese dollar exposure. However, given the increasingly broader market and
depth for forward contracts in both Korea and Taiwan, we may consider forward
contracts in the future.
 
     The economic downturns in the Asia Pacific region and Japan and the
devaluation of the Japanese yen against the U.S. dollar have affected and in the
future could affect our operating results. Additionally, other factors may have
a material adverse effect on our operations in the future including:
 
     -  the imposition of governmental controls;
 
     -  export license requirements;
 
     -  restrictions on the export of technology;
 
     -  political instability;
 
     -  trade restrictions and changes in tariffs; and
 
     -  difficulties in staffing and managing international operations.
 
     As a result, we may need to modify our current business practices.
 
WE MAY HAVE TO MAKE SUBSTANTIAL PAYMENTS IN CONNECTION WITH OUR TAISIL JOINT
VENTURE, AND THIS COULD DIVERT FUNDS FROM OTHER NEEDED AREAS
 
     As of January 31, 1999, Taisil had approximately $202.9 million of debt
outstanding. We have guaranteed approximately $75 million of such debt (which
may increase to approximately $81 million). Generally under the guarantees, if
VEBA AG's and its affiliates' ownership of MEMC common stock falls below 50% of
our total issued and outstanding shares, we become obligated to either pay, or
provide other collateral satisfactory to the banks, which may include a letter
of credit in an amount equal to, the maximum amount we may owe under the
guarantees.
 
     The terms of Taisil's loan agreements vary. If Taisil defaults on its
obligations to its lenders, in some circumstances Taisil may immediately be
required to repay all of its obligations to its lenders. If Taisil is required
to make an immediate repayment of its obligations to its lenders, we may be
required to make payments on our guarantees of Taisil's debt. The circumstances
in which immediate repayment may occur include, without limitation:
 
     -  a material adverse change in Taisil;
 
     -  a reduction below 70% in the combined ownership of Taisil by the two
        major joint venture partners (us and China Steel Corporation);
 
     -  a material adverse change in us or China Steel Corporation;
 
     -  a reduction below 50% in VEBA AG's and its affiliates' ownership of MEMC
        common stock; or
 
     -  other customary circumstances.
 
     We cannot assure you that Taisil's lenders will not declare a default on
Taisil's debt if they determine there has occurred a material adverse change, or
they determine a material adverse change occurs in the future, in Taisil or
MEMC. If MEMC is required to make payments on any guarantees, this would divert
capital needed to fund future operations.
 
   
     For more information about Taisil please see, "Recent Developments --
Taisil Electronic Materials Corporation" on page 21 and "Business -- Joint
Ventures -- Taisil Electronic Materials Corporation" on page 40.
    
 
                                       13
<PAGE>   15
 
BECAUSE WE CANNOT EASILY TRANSFER PRODUCTION OF SPECIFIC PRODUCTS FROM ONE OF
OUR MANUFACTURING FACILITIES TO ANOTHER, MANUFACTURING DELAYS AT A SINGLE
FACILITY COULD RESULT IN A LOSS OF CUSTOMERS
 
     It typically takes six months for one of our customers to qualify one of
our manufacturing facilities to produce a specific product, but it could take
longer in today's environment of excess capacity. Interruption of operations at
any of our primary manufacturing facilities could result in delays or
cancellations of shipments of silicon wafers and a loss of customers which could
materially and adversely affect our operating results. A number of factors could
cause interruptions, including labor disputes, equipment failures, or shortages
of raw materials or supplies. A union represents employees at PHC's facility in
Korea. A strike at this facility could cause interruptions in manufacturing. We
cannot assure you that alternate qualified capacity would be available on a
timely basis or at all.
 
MUCH OF OUR PROPRIETARY INFORMATION IS NOT PATENTED AND MAY NOT BE PATENTABLE
 
     Much of our proprietary information and technology relating to the wafer
manufacturing process is not patented and may not be patentable. We believe that
the success of our business depends in part on our proprietary technology,
information and processes and know-how. We generally try to protect our
intellectual property rights based on trade secrets and patents as part of our
ongoing research, development and manufacturing activities. Recently, we have
increased our efforts to obtain patent protection for our technology in response
to an increase in patent applications by our competitors. However, we cannot
assure you that we have adequately protected or will be able to adequately
protect our technology, that our competitors will not be able to utilize our
existing technology or develop similar technology independently, that the claims
allowed on any patents held by us will be broad enough to protect our technology
or that foreign intellectual property laws will adequately protect our
intellectual property rights.
 
SOME OF OUR TECHNOLOGY MAY INFRINGE ON THE INTELLECTUAL PROPERTY RIGHTS OF THIRD
PARTIES WHICH MAY SUBJECT US TO COSTLY PATENT LITIGATION
 
     From time to time, we receive notices from substantial companies with
significant patent portfolios that we may be infringing certain of their patents
or other rights. We may receive more of these notices in the future. If such
companies were to assert any claims against us based on patents or other rights
described in existing notices, we believe, based on strategic and other
considerations, that we should be able to resolve them outside of litigation
without a material adverse effect to us; however, this conclusion is subject to
significant uncertainty. We expect to try to resolve these matters through
negotiation or, if necessary, by obtaining a license. However, if we are not
able to resolve these matters satisfactorily, or to obtain a license on
acceptable terms, we may face litigation. In that event, the ultimate outcome of
these matters could have a material adverse effect on our business, results of
operations or financial condition. Although third parties have not sued us based
on claims of infringement of intellectual property rights during the last
several years, we cannot assure you that third parties will not bring such suits
in the future. Competitors, suppliers and others frequently sue each other
regarding intellectual property rights in other technology industries, including
the semiconductor industry.
 
DESPITE OUR EFFORTS WE HAVE FAILED TO RETAIN A NUMBER OF EXPERIENCED UPPER AND
MIDDLE MANAGEMENT, AND AS A RESULT WE FACE CHALLENGES IN ATTRACTING AND
RETAINING QUALIFIED PERSONNEL
 
     The loss of key personnel or the inability to hire and retain qualified
personnel could have a material adverse effect on our operating results. We are
dependent upon a limited number of key management and technical personnel. We
compete for personnel with other companies, academic institutions, government
entities and other organizations. Our future success will depend in part upon
our ability to attract and retain highly qualified personnel. We cannot assure
you that we will be successful in hiring or retaining qualified personnel, or
that any of our personnel will remain employed by MEMC.
 
     In March 1998, we adopted a special incentive bonus program designed to
retain the services of 24 of our officers and key employees, including eleven
then executive officers. Under this program, the participants received a special
bonus. Half of this bonus was paid when the participant entered into a special
incentive bonus agreement; the other half becomes payable on June 30, 1999,
subject to continued employment. If the participant's employment is terminated
under certain circumstances, that participant
 
                                       14
<PAGE>   16
 
must repay us all or a portion of the bonus the participant has already
received. Despite this program, a number of experienced members of upper and
middle management have left MEMC.
 
WE DEPEND ON CERTAIN SUPPLIERS AND FINDING ALTERNATIVE SOURCES OF SUPPLY COULD
AFFECT ADVERSELY OUR CUSTOMER QUALIFICATIONS AND MANUFACTURING YIELDS
 
     We obtain substantially all our requirements for several raw materials,
equipment, parts and supplies from sole suppliers. We believe that we could find
adequate alternative sources of supply for these raw materials, equipment, parts
and supplies. However, we may be required to obtain new qualifications from our
customers in order to change or substitute suppliers. We cannot predict whether
we would be successful or how long that process would take. In addition, our
manufacturing yields could be adversely affected while we transition to a new
supplier. A decrease in our manufacturing yields could have a material adverse
effect on our operating results.
 
     From time-to-time we have experienced limited supplies of certain raw
materials, equipment, parts and supplies, particularly polysilicon. We believe
that adequate quantities of all our key raw materials, equipment, parts and
supplies are currently available. However, because of the cyclical nature of our
industry, we may experience shortages in the future. Increases in prices
resulting from these shortages could have a material adverse effect on our
operating results.
 
   
BECAUSE THE PUBLIC IS FOCUSING MORE ATTENTION ON THE ENVIRONMENTAL IMPACT OF OUR
INDUSTRY AND ITS MANUFACTURING OPERATIONS, ENVIRONMENTAL LAWS AND REGULATIONS
MAY BECOME MORE STRINGENT IN THE FUTURE AND COULD FORCE MEMC TO EXPEND CAPITAL
TO COMPLY WITH SUCH LAWS
    
 
     Because the public is focusing more attention on the environmental impact
of the semiconductor and related industries' manufacturing operations,
environmental laws and regulations related to our industry may become more
stringent in the future. Any failure to comply with environmental laws could
subject us to substantial liability or could force us to significantly change
our manufacturing operations. We are subject to a variety of foreign, federal,
state and local laws and regulations governing the protection of the
environment. These environmental regulations include those related to the use,
storage, handling, discharge and disposal of toxic, volatile or otherwise
hazardous materials used in our manufacturing processes. Under some of these
laws and regulations, we could be held financially responsible for remedial
measures if our properties are contaminated, even if we did not cause such
contamination.
 
   
     In early 1998, a valve at our Italian facility malfunctioned, resulting in
a release of a hazardous gas. Governmental authorities are continuing to
investigate the incident and, in addition to private individuals, could seek to
assert claims against us. However, based on information currently available, we
do not believe any such claims should have a material adverse effect on us.
Also, we have been named as a defendant in two lawsuits with many other
defendants in which the plaintiffs allege damages related to environmental
problems. See "Business -- Legal Proceedings -- Texas Nuisance Actions" on page
42.
    
 
THE PUBLIC TRADING PRICE FOR MEMC COMMON STOCK MAY DECLINE BEFORE THE RIGHTS
EXPIRE
 
     After you exercise your rights and before the expiration of the rights
offering, the public trading price of MEMC common stock may decline. Further, we
cannot assure you that following the exercise of rights, you will be able to
sell the shares of MEMC common stock you purchase at a price equal to or greater
than the subscription price.
 
YOU MAY NOT REVOKE YOUR EXERCISE OF RIGHTS, AND WE MAY TERMINATE THE RIGHTS
OFFERING
 
     Once you exercise your rights, you may not revoke the exercise unless the
conditions to VEBA Zweite's obligation under its standby commitment are not
satisfied or waived prior to the time the rights expire. In that case, we will
extend the date the rights expire and you will be able to change your decision.
If we elect to withdraw or terminate the rights offering, neither we nor Harris
Trust and Savings Bank will have any obligation with respect to the rights
except to return, without interest, any subscription payments.
 
                                       15
<PAGE>   17
 
THE SUBSCRIPTION PRICE MAY NOT REFLECT THE VALUE OF MEMC
 
   
     The subscription price does not necessarily bear any relationship to the
book value of our assets, past operations, cash flows, losses, financial
condition or any other established criteria for valuation. A special committee
of the Board of Directors set the subscription price at the average trading
price per share of MEMC common stock during a period shortly before the date of
the final prospectus. You should not consider the subscription price as an
indication of the value of MEMC. See "The Rights Offering -- Determination of
Subscription Price" beginning on page 31.
    
 
YOUR INTEREST IN MEMC MAY BE DILUTED AS A RESULT OF THE PRIVATE PLACEMENT TO
VEBA ZWEITE
 
     Each stockholder's ownership interest in MEMC was substantially diluted as
a result of the private placement of shares to VEBA Zweite. If you are a
stockholder and exercise your basic subscription privilege in full, you will
restore your proportionate ownership interest in MEMC to the same interest you
had prior to the private placement to VEBA Zweite. If you exercise your
over-subscription privilege and receive shares pursuant to the over-subscription
privilege, you will increase your proportionate ownership interest in MEMC. If
you do not exercise your rights, your proportionate interest in MEMC will
substantially decrease.
 
OUR FLUCTUATING FINANCIAL RESULTS, OUR POSITION IN THE SILICON WAFER INDUSTRY
AND OUR RELATIONSHIP WITH VEBA MAY CREATE FLUCTUATIONS IN THE MEMC STOCK PRICE
 
     Based on the trading history of MEMC common stock, we believe that certain
factors cause the market price of MEMC common stock to fluctuate significantly.
These factors include, without limitation:
 
     - quarterly fluctuations in our financial results;
 
     - announcements of technological innovations or new products by us or our
       competitors;
 
     - market conditions in the semiconductor industry;
 
     - market conditions in the silicon wafer industry;
 
     - developments in patent or other proprietary rights;
 
     - changes in our relationships with our customers;
 
     - any actual or perceived change in our relationship with VEBA AG and its
       affiliates; and
 
     - the size of the public float of MEMC common stock (which will depend, in
       part, on the number of shares of MEMC common stock purchased or acquired
       by rights holders other than by the VEBA group in this rights offering).
 
     Technology company stocks in general have experienced extreme price and
trading volume fluctuations that often have been unrelated to the operating
performance of these companies. This market volatility may adversely affect the
market price of MEMC common stock. In addition, if we suffer an actual or
anticipated shortfall in net sales, gross margin or net earnings from security
analysts' expectations, the trading price of MEMC common stock in any given
period could decline.
 
                                       16
<PAGE>   18
 
           CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS
 
     The following statements are or may constitute forward-looking statements:
 
     - statements set forth in this prospectus or statements incorporated by
       reference from documents we have filed with the SEC, including possible
       or assumed future results of our operations, including but not limited to
       any statements contained herein or therein concerning:
 
        - the manner, timing and estimated savings of restructuring activities
          and the voluntary separation program;
 
        - the transfer of Spartanburg-based small diameter production activities
          to other existing locations;
 
        - the utilization of the restructuring reserve;
 
        - product volumes, pricing and operating results for the first quarter
          of 1999;
 
        - pricing for the near term;
 
        - capital expenditures for 1999;
 
        - our liquidity into 2000;
 
        - excess capacity for future periods;
 
        - the resolution of any intellectual property infringement claims;
 
        - the shipment of 12-inch prime polished and epitaxial wafers in 1999
          and timing of future demand for 12-inch wafers;
 
        - the continued support of VEBA AG;
 
        - the status, effectiveness and projected completion of our Year 2000
          initiatives;
 
        - the outcome of potential litigation;
 
   
        - an increase in interest expense on existing debt with VEBA AG and its
          affiliates;
    
 
        - the impact of the introduction of the euro;
 
        - estimated cost reductions for the global purchasing, plant focus and
          other initiatives;
 
        - our expectations for an increase in market demand for silicon wafers
          and semiconductors and an easing of pressure on pricing and margins in
          the year 2000;
 
        - our expectations concerning our lack of profitability in 1999 and our
          ability to generate positive cash flows in the year 2000;
 
   
        - implementations in our plants of QS 9000 and ISO 14001 certifications;
    
 
        - the expectations concerning Taisil and the Taiwanese silicon wafer
          market;
 
     - any statements preceded by, followed by or that include the words
       "believes," "expects," "predicts," "anticipates," "intends," "estimates,"
       "should," "may" or similar expressions; and
 
     - other statements contained or incorporated by reference in this
       prospectus regarding matters that are not historical facts.
 
     Because such statements are subject to risks and uncertainties, actual
results may differ materially from those expressed or implied by such
forward-looking statements. Factors that could cause actual results to differ
materially include, but are not limited to:
 
     - the demand for our silicon wafers worldwide;
 
     - utilization of manufacturing capacity;
 
                                       17
<PAGE>   19
 
     - demand for semiconductors generally;
 
     - changes in the pricing environment for our products;
 
     - general economic conditions in the Asia Pacific region and Japan;
 
     - changes in financial market conditions;
 
     - our competitors' actions;
 
     - willingness of our customers to re-qualify Spartanburg-based production
       at our other locations;
 
     - the accuracy of our assumptions regarding savings from restructuring
       activities;
 
     - the status and effectiveness of our Year 2000 efforts;
 
     - changes in interest and exchange rates; and
 
   
     - the factors discussed above under "Risk Factors" beginning on page 8.
    
 
     You should not place undue reliance on such statements, which speak only as
of the date that they were made. Our independent public accountants have not
examined or compiled the forward-looking statements and, accordingly, do not
provide any assurance with respect to such statements. These cautionary
statements should be considered in connection with any written or oral
forward-looking statements that we may issue in the future. We do not undertake
any obligation to release publicly any revisions to such forward-looking
statements after completion of the rights offering to reflect later events or
circumstances or to reflect the occurrence of unanticipated events.
 
                                       18
<PAGE>   20
 
                              RECENT DEVELOPMENTS
 
COST REDUCTION PLAN
 
     During the first half of 1998 we accelerated our cost reduction plan in
response to the difficult industry environment.
 
     We decided to close our small-diameter wafer facility in Spartanburg, South
Carolina and to withdraw from our joint venture participation in a
small-diameter wafer facility in China. We are negotiating the terms of our
withdrawal with our joint venture partner. We took these actions because:
 
     -  our customers have been operating their 8-inch fabrication lines in
        preference to their smaller diameter fabrication lines, reducing the
        demand for smaller diameter wafers;
 
     -  a number of our customers recently have undertaken restructuring
        initiatives focused on permanently eliminating small diameter lines; and
 
     -  we believe that even when the semiconductor market begins to recover, we
        will have excess small diameter wafer capacity.
 
     We also decided not to construct a new 8-inch wafer facility in Malaysia
due to the substantial excess capacity for these wafers.
 
     In addition, we implemented a voluntary separation program for our hourly
and salaried U.S. employees. As a result of the actions described above and
other initiatives, we are reducing our workforce by approximately 2,000
employees, or 25% compared to December 31, 1997.
 
     We estimated pre-tax savings from our restructuring activities and our
voluntary separation program to be $60 million on an annualized basis. We began
to realize approximately $30 million of these estimated savings in the third
quarter of 1998 through reduced personnel costs as a result of the voluntary
separation program.
 
     We expect the other $30 million in annualized savings to come from the
closure of our Spartanburg facility. We expect approximately half of the savings
from the Spartanburg facility's closure to relate to personnel costs, and the
other half of these savings to relate to manufacturing costs such as
depreciation and supplies and utilities. As we re-qualify and transfer the
production of silicon wafers made at the Spartanburg facility to other
locations, we expect to reduce our Spartanburg workforce. With each workforce
reduction, we expect a portion of our annualized cost savings associated with
personnel costs to be realized. As a result, we began to realize a portion of
the remaining $30 million in annualized cost savings in the third quarter of
1998. As the manufacturing cost savings are fixed in nature, we expect they will
largely be realized upon the closure of the Spartanburg facility.
 
   
     The time frame for achieving the $30 million in annualized cost savings
from the closing of the Spartanburg facility is largely dependent upon how long
it takes us to re-qualify the silicon wafers produced at the Spartanburg
facility at our other locations. This, in turn, determines how quickly
Spartanburg's workforce will be reduced. While we believe that this will occur
during the second quarter of 1999, the ability to re-qualify silicon wafers is
highly dependent upon the cooperation of our customers.
    
 
     We are also implementing a number of other cost cutting and savings
initiatives:
 
     -  We have initiated short-term plant shutdowns to better align production
        with the current lower level of demand;
 
     -  We are accelerating the implementation of our "best practices" worldwide
        and the development of new manufacturing technologies in order to reduce
        our processing costs;
 
     -  We are implementing a plant focus program that limits the number of
        wafer diameters manufactured at each site;
 
     -  We have implemented aggressive spending cuts for all of our departments;
 
     -  We are obtaining price concessions from our vendors; and
 
     -  We are performing a critical review of our capital spending and research
        and development requirements and reducing these planned investments
        where possible.
 
     We anticipate that we will reduce our capital expenditures in 1999 to less
than $85 million.
                                       19
<PAGE>   21
 
   
     The statements above regarding expected future savings and cost reduction
efforts are forward-looking statements. Actual results could differ materially
from our expectations due to, among other things, the factors set forth above
and the accuracy of assumptions regarding savings from restructuring activities.
See "Cautionary Statement Regarding Forward-Looking Statements" beginning on
page 17 and "Risk Factors" beginning on page 8.
    
 
FINANCIAL RESTRUCTURING PLAN
 
     In order to address our capital requirements, we have initiated a financial
restructuring that includes:
 
     -  the approximately $91.1 million net proceeds from this rights offering;
 
     -  the approximately $105.9 million of equity financing from VEBA Zweite
        pursuant to the private placement;
 
     -  an additional $150 million of debt financing from VEBA AG and its
        affiliates ($50 million of which became available on June 30, 1998 and
        $100 million of which became available on September 23, 1998); and
 
     -  an extension until 2001 of the maturities on all our outstanding debt
        maturing prior to January 1, 2001 with VEBA AG and its affiliates (but
        only in the event we have used our best efforts to obtain replacement
        financing on equivalent terms and have been unsuccessful).
 
   
     Private Placement to VEBA Zweite and the Rights Offering. On March 22,
1999, we sold 15,399,130 shares of MEMC common stock to VEBA Zweite at $6.89 per
share for aggregate net proceeds of approximately $105.9 million. Prior to the
private placement to VEBA Zweite, VEBA Corporation owned approximately 53.1% of
the outstanding shares. Our primary purpose for the sale to VEBA Zweite and the
rights offering is to raise approximately $200 million of additional capital. We
are proceeding with the rights offering to allow our stockholders (other than
the VEBA group) an opportunity to restore their proportionate interest in MEMC
at the same price per share of common stock as was paid by VEBA Zweite.
    
 
     We sold MEMC common stock to VEBA Zweite before the rights offering in
order to evidence the VEBA group's commitment to us and to increase our working
capital and reduce our interest expense. If rights holders (other than the VEBA
group) purchase all shares of MEMC common stock offered in this rights offering,
the VEBA group will again own approximately 53.1% of the outstanding shares.
 
     Debt Restructuring. As part of the agreement with VEBA AG and its
affiliates to provide the additional debt financing and to extend the maturity
dates of outstanding loans that mature prior to January 1, 2001 until their
respective maturity date anniversaries in 2001, we agreed to increase the
interest rates payable by MEMC on all of our debt to VEBA AG and its affiliates.
On January 31, 1999, we had approximately $777.0 million of U.S. dollar and
Japanese yen based loans outstanding with VEBA AG and its affiliates, including
$135 million of the additional $150 million of debt financing. Prior to this
restructuring, interest rates ranged from 2.1% to 7.6%. As part of the debt
restructuring completed during the third quarter of 1998, our loans with VEBA AG
and its affiliates have been repriced at interest rates reflecting the longer
maturities and at interest rate spreads applicable to an average industrial
borrower at an assumed credit rating. As a result, as of January 31, 1999, our
loans with VEBA AG and its affiliates have interest rates ranging from 3.4% to
9.7%.
 
     These higher rates will cause our interest payments on these loans to
increase by approximately $15 million per year, based on debt outstanding with
VEBA AG and its affiliates and the new interest rates that were in effect as of
September 30, 1998. In addition, for all existing loans that mature prior to
January 1, 2001 and which maturities are extended by VEBA AG and its affiliates
until 2001, the interest rates we must pay during the extension period will be
adjusted to reflect the then-current interest rate spreads applicable to an
average industrial borrower at an assumed credit rating.
 
     We have also agreed to increase the annual commitment fee payable by us on
the undrawn portion of these loans from 1/8 of one percent to 1/4 of one
percent. Additionally, we have agreed that we will not allow any encumbrances,
such as
 
                                       20
<PAGE>   22
 
mortgages and security interests, to be placed on
our properties.
 
     The additional $150 million of debt financing provided to us by VEBA AG and
its affiliates is also priced at interest rate spreads applicable to an average
industrial borrower at an assumed credit rating. As of January 31, 1999, $135
million of this additional debt financing was outstanding.
 
     The assumed credit rating for these loan agreements was assumed solely for
purposes of the loan agreements and does not reflect a view by MEMC or VEBA AG
or its affiliates as to the rating that would be assigned by an independent
rating agency. No independent rating agency currently rates MEMC or its debt.
 
TAISIL ELECTRONIC MATERIALS CORPORATION
 
     Taisil's financial performance has been adversely affected in recent
periods due to the downturn in the semiconductor industry in Taiwan. As a result
of this downturn, Taisil has incurred losses, which have negatively impacted its
debt-to-equity ratio. The increase in the debt-to-equity ratio and the downturn
in the semiconductor industry in Taiwan have raised concerns with Taisil's
lenders. In recent months, several financial institutions have indicated that
they would no longer purchase Taisil's commercial paper. Thus, Taisil was forced
to use alternative financing. In addition, we believe that several lenders have
placed Taisil on their credit watch lists. Certain of these lenders have also
made inquiries to MEMC and VEBA AG regarding our continued financial support to
Taisil. We have also been informed by one member of a three bank syndicate of
lenders to Taisil, that another bank in the syndicate expressed a preliminary
concern that a material adverse change in the financial condition of Taisil
might have occurred and, without additional equity contributions, an event of
default should be declared. Action by such bank syndicate, however, required the
agreement of two of the three banks, and we have been informed by the two other
banks that they did not believe a material adverse change in the financial
condition of Taisil had occurred.
 
   
     In order to improve Taisil's debt-to-equity ratio, certain of Taisil's
shareholders made capital contributions to Taisil of approximately $20.7 million
in November 1998 and $10.0 million in December 1998. Our share of these capital
contributions was approximately $10.3 million and $5.1 million, respectively. We
and certain of Taisil's other shareholders made an additional capital
contribution to Taisil of approximately $24 million in March 1999. Our share of
this capital contribution was approximately $12 million. Taisil is also in the
process of raising up to approximately $6 million of additional capital through
sale of stock to Taisil's employees and possibly to other investors. We believe
that these capital contributions will satisfy the concerns of Taisil's current
lenders, including the bank syndicate member that had previously expressed
concern about potential material adverse changes in the condition of Taisil.
However, if Taisil's financial performance continues to be adversely affected by
the downturn in the semiconductor industry in Taiwan, we and Taisil's other
shareholders may have to consider additional financing alternatives for Taisil.
    
 
     Statements above as to future capital contributions to Taisil and the
response to such capital contributions by Taisil's lenders are forward looking
statements. Such future capital contributions and response from Taisil's lenders
may not occur due to a variety of factors, including inability of Taisil's
shareholders to agree on the magnitude, apportionment or other terms of such
capital contributions, changes or perceived changes in Taisil's prospects,
regulatory requirements and the willingness of Taisil employees to make an
equity investment in Taisil.
 
OPTION ON PASADENA FACILITY
 
     In September 1998, we granted Tokuyama Corporation, Marubeni Corporation
and Marubeni America Corporation an option to acquire a majority interest in
MEMC Pasadena, Inc. Tokuyama is a Japanese polysilicon manufacturer and Marubeni
is a Japanese trading company. MEMC Pasadena is our granular polysilicon
subsidiary. In exchange for the option, Tokuyama and Marubeni made an option
payment to us. The term of the option is two years, subject to a one year
extension at the option of Tokuyama and Marubeni. If Tokuyama and Marubeni
exercise their option, we will then negotiate the terms and conditions
(including price) of the exercise with them based on the market value at that
time. The entire option payment will be applied toward the ultimate purchase
price. If Tokuyama and Marubeni do not exercise their option, then we will
                                       21
<PAGE>   23
 
return one-half of the option payment to them. During the term of the option,
Tokuyama and Marubeni have a right of first refusal over any transfer of MEMC
Pasadena's granular polysilicon business. In addition, for two years, we cannot
solicit offers from third parties for this business. In connection with the
option, Tokuyama will provide technical assistance to MEMC Pasadena for two
years (unless the option is earlier terminated by Tokuyama and Marubeni) to help
improve the quality of MEMC Pasadena's granular polysilicon products.
 
SHORT TERM LINE OF CREDIT WITH AN AFFILIATE OF VEBA AG
 
     On February 26, 1999, we received a short term $75 million revolving line
of credit from an affiliate of VEBA AG. We did not draw on this short term line
of credit and it terminated on the closing of the private placement to VEBA
Zweite. We paid a 1/4 percent commitment fee for all unused amounts of this line
of credit. Interest on our borrowings under this short term line of credit would
have reflected interest rates applicable to an average industrial borrower at an
assumed credit rating.
 
CHANGE OF OUR CHIEF EXECUTIVE OFFICER
 
     On February 17, 1999, Ludger Viefhues elected to retire as our Chief
Executive Officer. Klaus von Horde, formerly President and Chief Operating
Officer, became President and Chief Executive Officer. Mr. Viefhues agreed to
remain a director and employee of MEMC for a short period to assist in an
orderly transition.
 
CHANGES IN OUR BOARD OF DIRECTORS
 
     On August 12, 1998, Mr. Helmut Mamsch became Chairman of the Board and Dr.
Hans Michael Gaul joined the Board of Directors. Mr. Mamsch has been a member of
our Board of Directors since March 1998 and he replaced Dr. Erhard Meyer-Galow
as Chairman of the Board. Dr. Meyer-Galow resigned from the Board of Directors
effective as of November 30, 1998. Mr. Mamsch is a member of the Board of
Management of VEBA AG and recently assumed responsibility for VEBA AG's
corporate strategy and development. Dr. Gaul is a member of the Board of
Management of VEBA AG and serves as VEBA AG's Chief Financial Officer.
 
CHANGE OF OUR PRINCIPAL STOCKHOLDER
 
   
     On September 30, 1998, Huls Corporation, our former principal stockholder,
merged into its corporate parent, VEBA Corporation. As a result, VEBA
Corporation now owns the MEMC common stock previously owned by Huls Corporation.
Immediately after the merger, VEBA Corporation owned 53.1% of MEMC common stock.
As a result of the private placement to VEBA Zweite, the VEBA group now directly
owns 66.0% of MEMC common stock.
    
 
                                USE OF PROCEEDS
 
   
     We have received approximately $105.9 million from the private placement to
VEBA Zweite, after paying estimated expenses. We will use the proceeds of the
private placement to repay debt under our revolving credit agreements with VEBA
AG and its affiliates and for general corporate purposes. We will receive
approximately $91.1 million upon completion of this rights offering, after
deducting dealer managers' fees and our other estimated offering expenses. We
will use the proceeds from the rights offering and the standby agreement and any
remaining proceeds from the private placement to repay the remaining debt under
our revolving credit agreements with VEBA AG and its affiliates. At December 31,
1998, $131.4 million had been borrowed under these agreements and at January 31,
1999, $166.9 million had been borrowed under these agreements. The interest rate
under these agreements becomes fixed for each borrowing based upon the term of
that borrowing and an assumed credit rating for an average industrial borrower
as of the date of such borrowing. The credit rating was assumed solely for
purposes of the agreements and does not reflect a view by MEMC or VEBA AG or its
affiliates as to the rating that would be assigned by an independent rating
agency. No independent rating agency currently rates MEMC or its debt. As of
January 31, 1999, the interest rate ranged from approximately 9.3% to
approximately 9.6% with respect to such borrowings. The debt under these
agreements has been and will be used to fund capital expenditures and operating
losses. The remaining net proceeds
    
 
                                       22
<PAGE>   24
 
will be used for general corporate purposes. We expect to reborrow additional
amounts under the revolving credit agreements that are repaid from the proceeds
of the private placement and the rights offering and the standby agreement for
general corporate purposes. Our ability to reborrow will be subject to customary
conditions.
 
     Pending their ultimate application, we may deposit the remainder of the net
proceeds with VEBA AG or one of its affiliates and receive a market rate of
interest on the funds deposited. Alternatively, pending their ultimate
application, we may invest the net proceeds in interest or non-interest bearing
accounts or short-term government obligations, interest-bearing securities,
money market instruments or certificates of deposit.
 
                                DIVIDEND POLICY
 
     We are presently not paying dividends on MEMC common stock. We plan to
retain all net earnings, if any, to fund the development of our business. We do
not presently plan to pay dividends on MEMC common stock for the foreseeable
future. Our Board of Directors has sole discretion over the declaration and
payment of future dividends. Any future dividends will depend upon our
profitability, financial condition, cash requirements, future prospects, general
business conditions, the terms of any of our debt agreements and other factors
our Board of Directors believes are relevant.
 
                          PRICE RANGE OF COMMON STOCK
 
     You can find MEMC common stock traded on the NYSE under the symbol "WFR."
The following table shows the high and low sales prices of MEMC common stock
over recent periods.
 
   
<TABLE>
<CAPTION>
                                                                HIGH    LOW
                                                                ----    ---
<S>                                                             <C>     <C>
Year Ended December 31, 1996
  First Quarter.............................................    $37 1/4 $26 1/2
  Second Quarter............................................     55      36 1/4
  Third Quarter.............................................     40 5/8  20 1/4
  Fourth Quarter............................................     28 1/2  16 3/4
Year Ended December 31, 1997
  First Quarter.............................................     29 3/4  22 1/4
  Second Quarter............................................     38 1/4  22 7/8
  Third Quarter.............................................     38 7/8  25 5/8
  Fourth Quarter............................................     30      14 7/16
Year Ending December 31, 1998
  First Quarter.............................................     19      14 1/2
  Second Quarter............................................     16 7/16   9 1/4
  Third Quarter.............................................     10 13/16   2 15/16
  Fourth Quarter............................................     12 5/8   2 15/16
Year Ending December 31, 1999
  First Quarter (through March 18, 1999)....................     11 1/8   5 3/8
</TABLE>
    
 
   
     On January 31, 1999, we had 821 record stockholders. MEMC common stock's
price closed at $7 7/8 on October 21, 1998, the last full trading day before we
publicly announced the rights offering, and at $6 13/16 on March 18, 1999.
    
 
                                       23
<PAGE>   25
 
                                 CAPITALIZATION
 
   
     The following table shows our short-term debt and capitalization as of
December 31, 1998. The table also shows our short-term debt and capitalization
as adjusted for the consummation of the private placement to VEBA Zweite and
rights offering and the transactions contemplated by the standby agreement
(including application of the net proceeds from such transactions) at the
subscription price of $6.89 per share.
    
 
   
<TABLE>
<CAPTION>
                                                                     DECEMBER 31, 1998
                                                      -----------------------------------------------
                                                                                    AS ADJUSTED FOR
                                                                                   PRIVATE PLACEMENT,
                                                                    AS ADJUSTED     RIGHTS OFFERING
                                                                    FOR PRIVATE       AND STANDBY
                                                        ACTUAL       PLACEMENT         AGREEMENT
                                                      ----------    -----------    ------------------
                                                                      (IN THOUSANDS)
<S>                                                   <C>           <C>            <C>
Debt:
  Short-term debt to related parties................  $       --    $       --         $       --
  Short-term debt to third parties..................      38,644        38,644             38,644
                                                      ----------    ----------         ----------
     Total short-term debt (including current
       maturities of long-term debt)................  $   38,644    $   38,644             38,644
                                                      ==========    ==========         ==========
  Long-term debt to related parties.................  $  740,840    $  634,990         $  609,440
  Long-term debt to third parties...................     130,323       130,323            130,323
                                                      ----------    ----------         ----------
     Total long-term debt (excluding current
       maturities)..................................  $  871,163    $  765,313         $  739,763
                                                      ----------    ----------         ----------
Minority interests..................................      48,242        48,242             48,242
                                                      ----------    ----------         ----------
Stockholders' equity:
  Preferred stock, $0.01 par value: 50,000,000
     shares authorized, none issued and outstanding
  Common stock, $0.01 par value: 200,000,000 shares
     authorized, 41,436,421 shares issued (actual),
     56,835,551 shares issued (as adjusted for the
     private placement) and 70,463,997 shares issued
     (as adjusted for the private placement, rights
     offering and standby agreement)(1).............         414           568                705
  Additional paid-in capital........................     574,188       679,884            770,860
  Accumulated deficit...............................    (147,836)     (147,836)          (147,836)
  Accumulated other comprehensive loss..............     (10,581)      (10,581)           (10,581)
  Unearned restricted stock awards..................        (125)         (125)              (125)
  Treasury stock, at cost: 929,205 shares...........     (17,020)      (17,020)           (17,020)
                                                      ----------    ----------         ----------
     Total stockholders' equity.....................     399,040       504,890            596,003
                                                      ----------    ----------         ----------
     Total capitalization...........................  $1,318,445    $1,318,445         $1,384,008
                                                      ==========    ==========         ==========
</TABLE>
    
 
- ---------------
 
(1) Excludes 1,773,174 shares of MEMC common stock issuable upon exercise of
     employee stock options as of December 31, 1998 and 1,376,684 shares
     available for future grant under our Equity Incentive Plan.
 
                                       24
<PAGE>   26
                              THE RIGHTS OFFERING
 
THE RIGHTS
 
   
     On March 23, 1999, we will distribute to each holder of MEMC common stock
(except the VEBA group), at no charge, .715 transferable subscription rights for
each share of MEMC common stock they own. We will distribute the rights to you
only if you are a record holder of MEMC common stock on the record date, which
is 5:00 p.m., New York City time, on March 22, 1999. We will round up, to the
nearest whole number, the number of rights we distribute to each stockholder.
    
 
     BEFORE EXERCISING OR SELLING ANY RIGHTS, YOU SHOULD READ CAREFULLY THE
INFORMATION SET FORTH UNDER "RISK FACTORS" BEGINNING ON PAGE 8.
 
   
     The following describes the rights offering in general and assumes (unless
specifically provided otherwise) that you are a record holder of MEMC common
stock. If you hold your shares in a brokerage account or by a custodian bank,
please see "-- Beneficial Owners" on page 28 below.
    
 
NO FRACTIONAL RIGHTS
 
   
     We will not issue fractional rights, but rather will round up any
fractional rights to the nearest whole right. For example, if you own 140 shares
of MEMC common stock, you will receive 101 rights, instead of 100.1 rights you
would have received without rounding.
    
 
     You may request that Harris Trust and Savings Bank divide your rights
certificate into transferable parts, for instance if you are the record holder
for a number of beneficial holders of MEMC common stock. However, Harris Trust
and Savings Bank will not divide your rights certificate so that (through
rounding or otherwise) you would receive a greater number of rights than those
to which you otherwise would be entitled.
 
EXPIRATION DATE OF THE RIGHTS OFFERING
 
   
     You may exercise the basic subscription privilege and the over-subscription
privilege at any time before 5:00 p.m., New York City time, on April 13, 1999.
We may extend the time for exercising the rights. If you do not exercise your
rights before the time they expire, then your rights will be null and void. We
will not be obligated to honor your exercise of rights if Harris Trust and
Savings Bank receives the documents relating to your exercise after the time
they expire, regardless of when you transmitted the documents, except when you
have timely transmitted the documents pursuant to the guaranteed delivery
procedures described below.
    
 
   
     We will not extend the date the rights expire beyond May 15, 1999, unless
our Board of Directors believes that a material event has occurred and we need
more time to disclose adequately to you the information about the event.
    
 
   
     If we elect to extend the date the rights expire, we will issue a press
release announcing the extension before the first New York Stock Exchange
trading day after the most recently announced expiration date. If we extend the
date the rights will expire by more than 14 calendar days, we will send prompt
written notice of the extension to you and all rights holders of record. See
"-- Extensions and Termination" on page 32.
    
 
SUBSCRIPTION PRIVILEGES
 
     Your rights entitle you to the basic subscription privilege and the
over-subscription privilege.
 
   
     Basic Subscription Privilege.  With the basic subscription privilege, you
may purchase one share of MEMC common stock per right, upon delivery of the
required documents and payment of the subscription price of $6.89 per share,
before the time the rights expire. You are not required to exercise all of your
rights unless you wish to purchase shares under your over-subscription privilege
described below.
    
 
   
     Over-Subscription Privilege.  In addition to your basic subscription
privilege, you may subscribe for additional shares of MEMC common stock, upon
delivery of the required documents and payment of the subscription price of
$6.89 per share before the time the rights expire. You may only exercise your
over-subscription privilege if you exercised your basic subscription privilege
in full and other holders of rights do not exercise their basic subscription
privileges in full.
    
 
     Pro Rata Allocation.  If there are not enough shares to satisfy all
subscriptions pursuant to the exercise of the over-subscription privilege, we
will allocate the remaining shares pro rata (subject to the elimination of
fractional shares)
 
                                       25
<PAGE>   27
 
among those over-subscribing. Pro rata means in proportion to the number of
shares you and the other holders have purchased pursuant to the exercise of the
basic subscription privilege. If there is a pro rata distribution of the
remaining shares and the pro ration results in the allocation to you of a
greater number of shares than you subscribed for pursuant to the
over-subscription privilege, then we will allocate to you only the number of
shares for which you subscribed. We will allocate the remaining shares among all
other holders exercising their over-subscription privilege.
 
     Full Exercise of Basic Subscription Privilege. You may exercise the
over-subscription privilege only if you exercise your basic subscription
privilege in full. To determine if you have fully exercised your basic
subscription privilege, we will consider only the basic subscription privileges
held by you in the same capacity. For example, suppose you were granted rights
for shares of MEMC common stock you own individually and shares of MEMC common
stock you own collectively with your spouse. If you wish to exercise your
over-subscription privilege with respect to the rights you own individually, but
not with respect to rights you own collectively with your spouse, you only need
to exercise your basic subscription right with respect to your individually
owned rights. You do not have to subscribe for any shares under the basic
subscription privilege owned collectively with your spouse to exercise your
individual over-subscription privilege.
 
     When you complete the portion of the rights certificate to exercise the
over-subscription privilege, you will be representing and certifying that you
have fully exercised your basic subscription privilege received in respect of
shares of MEMC common stock you hold in that capacity. You must exercise your
over-subscription privilege at the same time you exercise your basic
subscription privilege in full.
 
     If you own your shares of MEMC common stock through your bank, broker or
other nominee holder who will exercise your over-subscription privilege on your
behalf, the nominee holder will be required to certify to us and the
subscription agent:
 
   
     - the number of shares held on March 22, 1999, the record date, on your
       behalf;
    
 
     - the number of rights you exercised under your basic subscription
       privilege;
 
     - that your entire basic subscription privilege held in the same capacity
       has been exercised in full; and
 
     - the number of shares of MEMC common stock you subscribed for pursuant to
       the over-subscription privilege.
 
     Your nominee holder must also disclose to us certain other information
received from you.
 
     Return of Excess Payment.  If you exercised your over-subscription
privilege and are allocated less than all of the shares of MEMC common stock for
which you wished to subscribe, the excess funds you paid for shares of MEMC
common stock that are not allocated to you will be returned by mail without
interest or deduction as soon as practicable after the expiration date of the
rights.
 
EXERCISE OF RIGHTS
 
     You may exercise your rights by delivering the following to Harris Trust
and Savings Bank at or before the time the rights expire:
 
     -  Your properly completed and executed rights certificate evidencing those
        rights with any required signature guarantees or other supplemental
        documentation; and
 
     -  Your payment in full of the subscription price for each share of MEMC
        common stock subscribed for pursuant to the basic subscription privilege
        and the over-
        subscription privilege.
 
METHOD OF PAYMENT
 
     Your payment of the subscription price must be made by either:
 
     -  Check or bank draft drawn upon a U.S. bank or postal, telegraphic, or
        express money order payable to Harris Trust and Savings Bank, as
        subscription agent; or
 
     -  Wire transfer of immediately available funds to the account maintained
        by the subscription agent for such purpose at The Chase Manhattan Bank,
        New York, N.Y., ABA No. 021 000 021, Account No.: 617-999988 (marked:
        "MEMC Electronic Materials, Inc. Subscription").
 
                                       26
<PAGE>   28
 
RECEIPT OF PAYMENT
 
     Your payment of the subscription price will be deemed to have been received
by Harris Trust and Savings Bank, the subscription agent, only upon:
 
     -  Clearance of any uncertified check;
 
     -  Receipt by Harris Trust and Savings Bank of any certified check or bank
        draft drawn upon a U.S. bank or any postal, telegraphic or express money
        order; or
 
     -  Receipt of collected funds in Harris Trust and Savings Bank's account at
        The Chase Manhattan Bank, New York, N.Y. designated above.
 
CLEARANCE OF UNCERTIFIED CHECKS
 
     You should note that funds paid by uncertified personal checks may take
five business days or more to clear. If you wish to pay the subscription price
by an uncertified personal check, we urge you to make payment sufficiently in
advance of the time the rights expire to ensure that your payment is received
and clears by that time. We urge you to consider using a certified or cashier's
check, money order or wire transfer of funds to avoid missing the opportunity to
exercise your rights.
 
DELIVERY OF SUBSCRIPTION MATERIALS AND PAYMENT
 
     You should deliver the rights certificate and payment of the subscription
price, as well as any nominee holder certifications, notices of guaranteed
delivery and DTC participant over-subscription forms,
 
     IF BY MAIL TO:
     Harris Trust and Savings Bank
     c/o Harris Trust Company of New York
     P.O. Box 1010
     New York, New York 10268-1010
 
     IF BY HAND DELIVERY OR OVERNIGHT COURIER TO:
     Harris Trust and Savings Bank
     c/o Harris Trust Company of New York
     Wall Street Plaza
     88 Pine Street, 19th Floor
     New York, New York 10005
 
     You may call Harris Trust and Savings Bank at (800) 245-7630.
 
CALCULATION OF RIGHTS EXERCISED
 
     If you do not indicate the number of rights being exercised, or do not
forward full payment of the aggregate subscription price for the number of
rights that you indicate are being exercised, then you will be deemed to have
exercised the basic subscription privilege with respect to the maximum number of
rights that may be exercised for the aggregate subscription price payment you
delivered to Harris Trust and Savings Bank. If your aggregate subscription price
payment is greater than the amount you owe for your subscription, you will be
deemed to have exercised the over-subscription privilege to purchase the maximum
number of shares with your overpayment. If we do not apply your full
subscription price payment to your purchase of shares of MEMC common stock, we
will return the excess amount to you by mail without interest or deduction as
soon as practicable after the date the rights expire.
 
EXERCISING A PORTION OF YOUR RIGHTS
 
   
     If you subscribe for fewer than all of the shares of MEMC common stock
represented by your rights certificate, you may, under certain circumstances,
either direct Harris Trust and Savings Bank to attempt to sell your remaining
rights or receive from Harris Trust and Savings Bank a new rights certificate
representing the unused rights. See "-- Method of Transferring and Selling
Rights" beginning on page 30.
    
 
FUNDS WILL BE HELD BY HARRIS TRUST AND SAVINGS BANK UNTIL SHARES OF COMMON STOCK
ARE ISSUED
 
     Harris Trust and Savings Bank will hold your payment of the subscription
price in a segregated account with other payments received from holders of
rights until we issue to you your shares of MEMC common stock.
 
SIGNATURE GUARANTEE MAY BE REQUIRED
 
   
     Your signature on each rights certificate must be guaranteed by an eligible
institution such as a member firm of a registered national securities exchange
or a member of the National Association of Securities Dealers, Inc. or a
commercial bank or trust company having an office or correspondent in the United
States, subject to standards and procedures adopted by Harris Trust and Savings
Bank, unless:
    
 
                                       27
<PAGE>   29
 
     -  Your rights certificate provides that the shares of the MEMC common
        stock you subscribed for are to be delivered to you; or
 
     -  You are an eligible institution.
 
NOTICE TO BENEFICIAL HOLDERS
 
   
     If you are a broker, a trustee or a depositary for securities who holds
shares of MEMC common stock for the account of others (a "nominee record date
holder"), you should notify the respective beneficial owners of such shares of
the rights as soon as possible to find out such beneficial owners' intentions.
You should obtain instructions from the beneficial owner with respect to the
rights, as set forth in the instructions we have provided to you for your
distribution to beneficial owners. If the beneficial owner so instructs, you
should complete the appropriate rights certificates and, in the case of the
over-subscription privilege, the related nominee holder certification, and
submit them to Harris Trust and Savings Bank with the proper payment. Nominee
record date holders that hold shares for the account(s) of more than one
beneficial owner may exercise the number of rights to which all such beneficial
owners in the aggregate otherwise would have been entitled if they had been
direct record holders of MEMC common stock on March 22, 1999, the record date,
provided the nominee record date holder makes a proper showing to Harris Trust
and Savings Bank.
    
 
BENEFICIAL OWNERS
 
     If you are a beneficial owner of shares of MEMC common stock or rights that
you hold through a nominee record date holder, we will ask your broker,
custodian bank or other nominee to notify you of this rights offering. If you
wish to sell or exercise your rights, you will need to have your broker,
custodian bank or other nominee act for you. To indicate your decision with
respect to your rights, you should complete and return to your broker, custodian
bank or other nominee the form entitled "Beneficial Owners Election Form." You
should receive this form from your broker, custodian bank or other nominee with
the other rights offering materials.
 
INSTRUCTIONS FOR COMPLETING THE RIGHTS CERTIFICATE
 
     You should read and follow the instructions accompanying the rights
certificates carefully. If you want to exercise your rights, you must send your
rights certificates to Harris Trust and Savings Bank. YOU SHOULD NOT SEND THE
RIGHTS CERTIFICATES TO US.
 
     YOU ARE RESPONSIBLE FOR THE METHOD OF DELIVERY OF RIGHTS CERTIFICATES, ANY
NECESSARY ACCOMPANYING DOCUMENTS AND PAYMENT OF THE SUBSCRIPTION PRICE TO HARRIS
TRUST AND SAVINGS BANK. IF YOU SEND THE RIGHTS CERTIFICATES AND PAYMENT OF THE
AGGREGATE SUBSCRIPTION PRICE BY MAIL, WE RECOMMEND THAT YOU SEND THEM BY
REGISTERED MAIL, PROPERLY INSURED, WITH RETURN RECEIPT REQUESTED. YOU SHOULD
ALLOW A SUFFICIENT NUMBER OF DAYS TO ENSURE DELIVERY TO HARRIS TRUST AND SAVINGS
BANK AND CLEARANCE OF PAYMENT PRIOR TO THE TIME THE RIGHTS EXPIRE.
 
DETERMINATIONS REGARDING THE EXERCISE OF RIGHTS
 
     We will decide all questions concerning the timeliness, validity, form and
eligibility of your exercise of rights. Our decisions will be final and binding.
We, in our sole discretion, may waive any defect or irregularity, or permit a
defect or irregularity to be corrected within such time as we may determine. We
may reject the exercise of any of your rights because of any defect or
irregularity. Your subscription will not be deemed to have been received or
accepted until all irregularities have been waived by us or cured by you within
such time as we decide, in our sole discretion.
 
   
     Neither we nor Harris Trust and Savings Bank, will be under any duty to
notify you of a defect or irregularity. We will not be liable for failing to
give you such notice. We reserve the right to reject your exercise of rights if
your exercise is not in accordance with the terms of the rights offering or in
proper form. We will also not accept your exercise of rights if our issuance of
shares of MEMC common stock pursuant to your exercise could be deemed unlawful
or materially burdensome. See "-- Regulatory Limitation" on page 32 and "--
Compliance with State Regulations Pertaining to the Rights Offering" on page 34.
    
 
                                       28
<PAGE>   30
 
GUARANTEED DELIVERY PROCEDURES
 
     If you wish to exercise your rights, but you do not have sufficient time to
deliver the rights certificates evidencing your rights to the subscription agent
on or before the time the rights expire, you may exercise your rights by the
following guaranteed delivery procedures:
 
   
     -  Make your payment in full of the subscription price for each share of
        MEMC common stock being subscribed for pursuant to the basic
        subscription privilege and the over-subscription privilege to be
        received (in the manner set forth in "-- Method of Payment" on page 26)
        to Harris Trust and Savings Bank on or before the time the rights
        expire;
    
 
     -  Deliver a notice of guaranteed delivery to Harris Trust and Savings Bank
        at or before the time the rights expire; and
 
     -  Deliver the properly completed rights certificate evidencing the rights
        being exercised (and, if applicable for a nominee holder, the related
        nominee holder certification), with any required signatures guaranteed,
        to Harris Trust and Savings Bank, within one New York Stock Exchange
        trading day following the date of the notice of guaranteed delivery was
        delivered to Harris Trust and Savings Bank.
 
     Your notice of guaranteed delivery must be substantially in the form
provided with the "Instructions As To Use Of Rights Certificates" distributed to
you with your rights certificate. Your notice of guaranteed delivery must come
from an eligible institution, or other eligible guarantee institutions which are
a member of, or a participant in, a signature guarantee program acceptable to
Harris Trust and Savings Bank. In your notice of guaranteed delivery you must
state:
 
     -  Your name;
 
     -  The number of rights represented by your rights certificates, the number
        of shares of MEMC common stock you are subscribing for pursuant to the
        basic subscription privilege and the number of the shares of MEMC common
        stock, if any, you are subscribing for pursuant to the over-
        subscription privilege; and
 
     -  Your guarantee that you will deliver to Harris Trust and Savings Bank
        any rights certificates evidencing the rights you are exercising within
        one New York Stock Exchange trading day following the date Harris Trust
        and Savings Bank receives your notice of guaranteed delivery.
 
   
     You may deliver the notice of guaranteed delivery to Harris Trust and
Savings Bank in the same manner as the rights certificate at the addresses set
forth above, under "-- Delivery of Subscription Materials and Payment" on page
27. You may also transmit the notice of guaranteed delivery to Harris Trust and
Savings Bank by telegram or facsimile transmission (telecopier no. (212)
701-7636). To confirm facsimile deliveries, you may call (212) 701-7624.
    
 
     Morrow & Co., Inc. will send you additional copies of the form of notice of
guaranteed delivery if you need them. Please call Morrow & Co., Inc. at (800)
566-9061. Banks and brokerage firms please call (800) 622-5200 to request any
copies of the form of notice of guaranteed delivery.
 
SUBSCRIPTION AGENT
 
     We have appointed Harris Trust and Savings Bank as subscription agent for
the rights offering. We will pay its fees and expenses related to the rights
offering. We also have agreed to indemnify Harris Trust and Savings Bank from
certain liabilities which it may incur in connection with the rights offering.
 
QUESTIONS ABOUT EXERCISING RIGHTS -- INFORMATION AGENT
 
     You may direct any questions or requests for assistance concerning the
method of exercising your rights, additional copies of this prospectus, the
instructions, the nominee holder certification, the notice of guaranteed
delivery or other subscription documents referred to herein, to Morrow & Co.,
Inc., the information agent, at the following telephone number and address:
 
    Morrow & Co., Inc.
    445 Park Avenue, 5th Floor
    New York, NY 10022
    (212) 754-8000
    Toll Free (800) 566-9061
    Banks and Brokerage Firms
    Please call (800) 662-5200
 
                                       29
<PAGE>   31
 
NO REVOCATION OF EXERCISE OF RIGHTS UNLESS VEBA ZWEITE'S CONDITIONS ARE NOT MET
 
     Once you have exercised your basic subscription privilege and/or
over-subscription privilege, you may not revoke your exercise, unless the
conditions to VEBA Zweite's obligation to purchase all of the shares not
purchased by other rights holders in this rights offering are not satisfied or
waived before the time the rights expire. In that case, we plan to notify you
through a prospectus supplement, you will be able to change your decision, and
we may extend the date the rights expire.
 
NO FRACTIONAL SHARES WILL BE ISSUED
 
     We will not issue any fractional shares of MEMC common stock. You may not
exercise a right in part.
 
METHOD OF TRANSFERRING AND SELLING RIGHTS
 
   
     We have applied to list the rights on the New York Stock Exchange under the
symbol "WFRRT." Additionally, we expect that rights may be purchased or sold
through usual investment channels until the close of business on the last
trading day preceding the date the rights expire. However, there has been no
prior public market for the rights. We cannot assure you that a trading market
for the rights will develop or, if a market develops, that the market will
remain available throughout the subscription period. Additionally, we cannot
assure you of the price at which the rights will trade, if at all. If you do not
exercise or sell your rights you will lose any value inherent in the rights. See
"-- General Considerations Regarding the Partial Exercise, Transfer or Sale of
Rights" on page 31.
    
 
     Transfer of Rights.  You may transfer rights in whole by endorsing the
rights certificate for transfer. Please follow the instructions for transfer
included in the information sent to you with your rights certificate. If you
wish to transfer only a portion of the rights (but not fractional rights), you
should deliver your properly endorsed rights certificate to Harris Trust and
Savings Bank. With your rights certificate, you should include instructions to
register such portion of the rights evidenced thereby in the name of the
transferee (and to issue a new rights certificate to the transferee evidencing
such transferred rights). If there is sufficient time before the expiration of
the rights offering, the subscription agent will send you a new rights
certificate evidencing the balance of the rights issued to you but not
transferred to the transferee. You may also instruct Harris Trust and Savings
Bank to send the rights certificate to one or more additional transferees. If
you do not wish to receive your remaining rights, you may instruct Harris Trust
and Savings Bank to sell your rights for you as described below.
 
     If you wish to transfer all or a portion of your rights (but not fractional
rights), you should allow a sufficient amount of time prior to the time the
rights expire for Harris Trust and Savings Bank to:
 
     -  Receive and process your transfer instructions; and
 
     -  Issue and transmit a new rights certificate to your transferee or
        transferees with respect to transferred rights, and to you with respect
        to rights you retained, if any.
 
     If you wish to transfer your rights to any person other than a bank or
broker, the signatures on your rights certificate must be guaranteed by an
eligible institution.
 
     Sales of Rights Through Harris Trust and Savings Bank.  You may also sell
the rights, in whole or in part (but not fractional rights), through Harris
Trust and Savings Bank as the subscription agent. If you wish to have Harris
Trust and Savings Bank try to sell your rights, you must deliver your properly
executed rights certificate, with appropriate instructions, to Harris Trust and
Savings Bank. If you want the subscription agent to try to sell only a portion
of your rights, you must send Harris Trust and Savings Bank instructions setting
forth what you would like done with the rights, along with your rights
certificate.
 
     If Harris Trust and Savings Bank sells rights for you, it will send you a
check for the proceeds from the sale of any of your rights as soon as possible
after the date the rights expire. If your rights can be sold, the sale will be
deemed to have been made at the weighted average sale price of all rights sold
by Harris Trust and Savings Bank. We will pay the fees charged by Harris Trust
and Savings Bank for making your sale. We cannot assure you, however, that a
market will develop for the rights or that Harris Trust and Savings Bank will be
able to sell your rights.
                                       30
<PAGE>   32
 
   
     You must have your order to sell your rights to Harris Trust and Savings
Bank before 11:00 a.m., New York City time, on April 6, 1999, the fifth business
day before the date the rights are expected to expire. If less than all sales
orders received by Harris Trust and Savings Bank are filled, it will prorate the
sales proceeds among you and the other holders based upon the number of rights
each holder has instructed Harris Trust and Savings Bank to sell during such
period, irrespective of when during such period the instructions are received by
it. Harris Trust and Savings Bank is required to sell your rights only if it is
able to find buyers. If Harris Trust and Savings Bank cannot sell your rights by
5:00 p.m. New York City time, on April 8, 1999, the third business day prior to
the dates the rights are expected to expire, Harris Trust and Savings Bank will
return your rights certificate promptly by mail to you.
    
 
     General Considerations Regarding the Partial Exercise, Transfer or Sale of
Rights.  You should also allow two to ten business days for your transferee to
exercise or sell the rights evidenced by such new rights certificates. The
amount of time needed by your transferee to exercise or sell its rights depends
upon the method by which the transferee delivers the rights certificates, the
method of payment made by the transferee, and the number of transactions which
the holder instructs Harris Trust and Savings Bank to effect. Neither we nor
Harris Trust and Savings Bank will be liable to a transferee or transferor of
rights if rights certificates or any other required documents are not received
in time for exercise or sale prior to the time the rights expire.
 
     You will receive a new rights certificate upon a partial exercise, transfer
or sale of rights only if Harris Trust and Savings Bank receives your properly
endorsed rights certificate no later than 5:00 p.m., New York City time, five
business days before the date the rights expire. Harris Trust and Savings Bank
will not issue a new rights certificate if your rights certificate is received
after that time and date. If your instructions and rights certificate are not
received by Harris Trust and Savings Bank by that time and date, you will lose
your power to sell or exercise your remaining rights.
 
     Unless you make other arrangements with Harris Trust and Savings Bank, a
new rights certificate issued to you after 5:00 p.m., New York City time, five
business days before the date the rights expire will be held for pick-up by you
at Harris Trust and Savings Bank's hand delivery address provided herein. You
bear the responsibility for all newly issued rights certificates.
 
     Except for fees charged by Harris Trust and Savings Bank (which will be
paid by us), you are responsible for all commissions, fees and other expenses
(including brokerage commissions and transfer taxes) incurred in connection with
the purchase, sale or exercise of your rights. Any amounts you owe will be
deducted from your account.
 
     IF YOU DO NOT EXERCISE YOUR RIGHTS BEFORE THE SPECIFIED EXPIRATION TIME,
YOUR RIGHTS WILL EXPIRE AND WILL NO LONGER BE EXERCISABLE.
 
PROCEDURES FOR DTC PARTICIPANTS
 
     We expect that the rights will be eligible for transfer through, and that
your exercise of your basic subscription privilege (but not your over-
subscription privilege) may be made through, the facilities of The Depository
Trust Company (commonly known as DTC). If your rights are exercised as part of
the basic subscription privilege through DTC we refer to them as "DTC Exercised
Rights." If you hold DTC Exercised Rights, you may exercise your
over-subscription privilege by properly executing and delivering to Harris Trust
and Savings Bank, at or prior to the time the rights expire, a DTC participant
over-subscription exercise form and a nominee holder certification and making
payment of the appropriate subscription price for the number of shares of MEMC
common stock for which your over-subscription privilege is to be exercised.
Please call Harris Trust and Savings Bank at (800) 245-7630 to obtain copies of
the DTC participant over-subscription exercise form and the nominee holder
certification.
 
DETERMINATION OF SUBSCRIPTION PRICE
 
   
     A special committee of our Board of Directors set the subscription price at
an average trading price of MEMC common stock from March 11, 1999 to March 17,
1999. We completed the private placement of shares to VEBA Zweite on March 22,
1999 at $6.89 per share. In approving the subscription price, the special
committee considered a number of factors, including advice provided by the
dealer managers with respect to the size, pricing and structure of the private
    
 
                                       31
<PAGE>   33
 
   
placement to VEBA Zweite and the rights offering and the results of analyses
performed by NationsBanc Montgomery Securities LLC to assist us in determining
the appropriate and desirable pricing terms for the private placement to VEBA
Zweite and the rights offering. The special committee also considered additional
factors, such as the alternatives available to us for raising capital, the
market price of MEMC common stock, the pro rata nature of the private placement
to VEBA Zweite and the rights offering, the pricing of similar transactions, our
business prospects and the general condition of the securities markets. See
"Plan of Distribution" beginning on page 54.
    
 
EXTENSIONS AND TERMINATION
 
   
     We may extend the rights offering and the period for exercising your
rights. However, we will not extend the rights offering or exercise period
beyond May 15, 1999. We may terminate the rights offering at any time prior to
the time the rights expire.
    
 
NO RECOMMENDATIONS TO RIGHTS HOLDERS
 
     We are not making any recommendation as to whether or not you should
exercise your rights. You should make your decision based on your own assessment
of your best interests. None of our Board of Directors, the special committee,
our officers, the dealer managers or any other person are making any
recommendations as to whether or not you should exercise your rights.
 
FOREIGN STOCKHOLDERS AND STOCKHOLDERS WITH APO OR FPO ADDRESSES
 
   
     We will not mail rights certificates to record date holders or to
subsequent transferees whose addresses are outside the United States or who have
an APO or FPO address. Instead, we will have Harris Trust and Savings Bank hold
such rights certificates for such holders' accounts. To exercise their rights,
such holders must notify the subscription agent prior to 11:00 a.m., New York
City time, on April 8, 1999, three business days prior to the date the rights
expire, and must establish to the satisfaction of the subscription agent that
such exercise is permitted under applicable law. If such holder does not notify
and provide acceptable instructions to Harris Trust and Savings Bank by such
time (if no contrary instructions have been received), the rights will be sold,
subject to Harris Trust and Savings Bank's ability to find a purchaser. Any such
sales will be deemed to be effected at the weighted average sale price of all
rights sold by Harris Trust and Savings Bank. See "-- Method of Transferring and
Selling Rights" beginning on page 30. If the rights can be sold, Harris Trust
and Savings Bank will remit a check for the proceeds from the sale of any rights
to such holders by mail. The proceeds, if any, resulting from sales of rights
pursuant to the basic subscription privilege of holders whose addresses are not
known by Harris Trust and Savings Bank or to whom delivery cannot be made will
be held in an interest bearing account. Any amount remaining unclaimed on the
second anniversary of the date the rights expire will be turned over to us.
    
 
REGULATORY LIMITATION
 
     We will not be required to issue to you shares of MEMC common stock
pursuant to the rights offering if, in our opinion, you would be required to
obtain prior clearance or approval from any state or federal regulatory
authorities to own or control such shares if, at the time the rights expire, you
have not obtained such clearance or approval.
 
ISSUANCE OF COMMON STOCK
 
     Harris Trust and Savings Bank will issue to you certificates representing
shares of MEMC common stock you purchase pursuant to the rights offering as soon
as practicable after the time the rights expire.
 
     Your payment of the aggregate subscription price will be retained by Harris
Trust and Savings Bank, and will not be delivered to us, until your subscription
is accepted and you are issued your stock certificates. We will not pay you any
interest on funds paid to Harris Trust and Savings Bank, regardless of whether
such funds are applied to the subscription price or returned to the you. You
will have no rights as a stockholder of MEMC with respect to shares of MEMC
common stock subscribed for until certificates representing such shares are
issued to you. Upon our issuance of such certificates, you will be deemed the
owner of the shares you purchased by exercise of your rights. Unless otherwise
instructed in the rights certificates, your certificates for shares issued
 
                                       32
<PAGE>   34
 
pursuant to your exercise of rights will be registered in your name.
 
     If the rights offering is not completed for any reason, Harris Trust and
Savings Bank will promptly return, without interest, all funds received by it.
 
     We will retain any interest earned on the funds held by Harris Trust and
Savings Bank prior to the closing or termination of the rights offering.
 
VEBA GROUP
 
   
     As of March 22, 1999, the record date, the VEBA group will beneficially own
approximately 36,890,072 shares of the outstanding MEMC common stock (66.0% of
the outstanding shares). The VEBA group is comprised of VEBA Zweite and VEBA
Corporation, each a subsidiary of VEBA AG and its subsidiaries.
    
 
PRIVATE PLACEMENT TO VEBA ZWEITE
 
   
     On March 22, 1999, we sold 15,399,130 shares of MEMC common stock to VEBA
Zweite at $6.89 per share, the subscription price, for aggregate proceeds to us
of approximately $105.9 million, after paying estimated expenses. See "Recent
Developments -- Financial Restructuring Plan -- Private Placement to VEBA Zweite
and the Rights Offering" on page 20.
    
 
STANDBY AGREEMENT WITH VEBA ZWEITE
 
   
     Although we will not distribute any rights to VEBA Zweite, it has agreed to
purchase at $6.89 per share, the subscription price, all shares of MEMC common
stock not purchased by rights holders in the rights offering. This standby
agreement is subject to certain conditions, including the following material
conditions which have not yet been satisfied:
    
 
     -  VEBA Zweite must receive a specified opinion of our counsel;
 
     -  VEBA Zweite must receive a specified letter from our certified public
        accountants;
 
     -  we must not have received a stop order suspending our registration
        statement of which this prospectus forms a part;
 
     -  we must not have experienced any material adverse change in our capital
        stock or any material increase in our short-term or long-term debt other
        than in the ordinary course of business or pursuant to existing
        agreements with VEBA Corporation and its affiliates;
 
     -  we must not have experienced any material adverse change since October
        22, 1998;
 
     -  we must not have incurred any material liabilities or obligations,
        except liabilities with VEBA Corporation and its affiliates, that were
        not in existence on October 22, 1998; and
 
     -  all representations and warranties we made in the standby agreement with
        VEBA Zweite must be true and correct as of the day the rights expire.
 
     The number of shares VEBA Zweite purchases will be determined after all
rights holders exercise their basic subscription and over-subscription
privileges. VEBA Zweite will pay for the shares of MEMC common stock it
purchases under the standby agreement on or after the date the rights expire. If
VEBA Zweite or its affiliates purchases any rights, they will not exercise their
over-subscription privilege with respect to those rights.
 
   
     Assuming no other holders exercise their rights and VEBA Zweite purchases
all unsubscribed shares of MEMC common stock offered hereby, the VEBA group will
own approximately 72.7% of the MEMC common stock issued and outstanding after
the rights offering, based on the number of shares purchased by VEBA Zweite in
the private placement and the number of shares of MEMC common stock outstanding
as of January 31, 1999.
    
 
SHARES OF COMMON STOCK OUTSTANDING AFTER THE RIGHTS OFFERING
 
   
     Assuming we issue all of the shares of MEMC common stock offered in the
rights offering, approximately 69,534,792 shares of MEMC common stock will be
issued and outstanding. Based on the 15,399,130 shares purchased by VEBA Zweite
in the private placement and the 40,507,216 shares of MEMC common stock
outstanding as of January 31, 1999, our issuance of shares in the rights
offering would result (on a pro forma basis as of January 31,
    
 
                                       33
<PAGE>   35
 
   
1999) in a 24.4% increase in the number of outstanding shares of MEMC common
stock.
    
 
COMPLIANCE WITH STATE REGULATIONS PERTAINING TO THE RIGHTS OFFERING
 
     We are not making the rights offering in any state or other jurisdiction in
which it is unlawful to do so. We will not sell or accept an offer to purchase
MEMC common stock from you if you are a resident of any such state or other
jurisdiction. We may delay the commencement of the rights offering in certain
states or other jurisdictions in order to comply with the laws of such states or
other jurisdictions. We do not expect that there will be any changes in the
terms of the rights offering. However, we may decide, in our sole discretion,
not to modify the terms of the rights offering as may be requested by certain
states or other jurisdictions. If that happens and you are a resident of that
state, you will not be eligible to participate in the rights offering.
 
                                       34
<PAGE>   36
 
                                    BUSINESS
 
GENERAL
 
     MEMC is a leading worldwide producer of silicon wafers. The silicon wafer
is the fundamental building block from which almost all semiconductors are
manufactured. Semiconductors are used in virtually all electronic applications,
including computers, telecommunications equipment, automobiles, consumer
electronics products, industrial automation and control systems, and analytical
and defense systems. We operate manufacturing facilities, directly or through
joint ventures, in Italy, Japan, Malaysia, South Korea, Taiwan, and the United
States. We sell silicon wafers to most of the world's largest manufacturers of
semiconductors. We are the leading worldwide supplier of silicon wafers outside
of Japan and the only significant non-Japanese silicon wafer manufacturer with
manufacturing and research facilities in Japan.
 
INDUSTRY OVERVIEW
 
     Almost all semiconductors are manufactured from silicon wafers, and thus
the strength of the silicon wafer industry is highly correlated to the
performance of the semiconductor industry. Although there are over two hundred
semiconductor manufacturers worldwide, we believe that the top twenty
semiconductor manufacturers accounted for over 70% of all semiconductor revenues
in 1998. We also believe that of the approximately 18 silicon wafer
manufacturers in the world today, six principal manufacturers, including
ourselves, supply a substantial majority of the wafers used by the major
semiconductor manufacturers.
 
Semiconductor Industry
 
     The semiconductor industry historically has been a high growth cyclical
industry. Worldwide, the industry grew at a compound annual growth rate of 14.1%
from $24.3 billion in revenues in 1985 to $134.8 billion in revenues in 1998,
according to Dataquest estimates. Continuous improvements in semiconductor
process and design technologies, semiconductor fabrication equipment and the
composition of silicon wafers have allowed semiconductor manufacturers to
produce more complex, higher performance and more reliable devices at a lower
cost per device. The result has been a large proliferation of uses for
semiconductors and historically rapid growth in semiconductor revenue.
 
     Despite the semiconductor industry's history of significant growth,
semiconductor revenues grew by only 3.6% in 1997 and declined by 8.4% in 1998,
according to Dataquest estimates. This slowdown has been attributed to excess
capacity and resultant price erosion, especially for DRAM (commonly used
computer memory chips). This downturn has extended through 1998 due to continued
overcapacity and the weak economic conditions in the Asia Pacific and Japanese
markets.
 
     Throughout this downturn, semiconductor manufacturers have been exerting
significant price pressure on their raw material suppliers, including silicon
wafer manufacturers. Semiconductor manufacturers have also accelerated the speed
at which they have reduced their device line widths, or the distance between
circuit elements, in an effort to reduce costs. The reduction in line widths
results in a requirement of less silicon per device. Additionally, the
semiconductor industry has recently experienced significant restructuring and
consolidation activities.
 
     Semiconductor manufacturers greatly reduced their capital spending
beginning in late 1997 and throughout 1998. This reduced capital spending has
limited additions to capacity.
 
Silicon Wafer Industry
 
   
     The silicon wafer industry historically has been a high growth cyclical
industry correlated to the growth of the semiconductor industry. Worldwide, the
industry grew at a compound annual growth rate of 9.2% from 1.2 billion square
inches in 1985 to 3.7 billion square inches in 1998, according to Dataquest
estimates. From 1993 through the first half of 1996 the industry was
characterized by excess demand and wafer shortages. Due to these shortages and
anticipated future demand, wafer manufacturers quickly added capacity,
especially for 8-inch wafers, the predominant wafer used in the industry today
and the wafer diameter anticipated to have the most significant growth in demand
over the next several years. This growth rate declined significantly in 1996.
    
 
                                       35
<PAGE>   37
 
     The silicon wafer industry slowdown, which began in the summer of 1996, has
left the industry in a state of overcapacity. Price declines have resulted from
this overcapacity. Moreover, the weakness of the Japanese yen and Deutsche mark
have allowed Japanese and German competitors to offer lower dollar based
pricing. The price declines have been greatest for 8-inch wafers where the
highest overcapacity exists. According to Dataquest, silicon wafer consumption
declined by an estimated 7.6% in 1998.
 
     Major silicon wafer manufacturers, including MEMC, invested in 12-inch
wafer manufacturing capacity in anticipation that the semiconductor industry
would migrate to this larger diameter wafer. However, in 1998, the industry
experienced a softening semiconductor market and successful implementation of
thinner device linewidths on the current diameters. This resulted in industry
recognition that the transition to 12-inch wafers would be delayed. The new
transition timing requires 12-inch wafer characteristics to be even more
advanced at the time they are introduced for production of integrated circuits.
 
   
     The leading semiconductor manufacturers organized and funded two industry
consortia, International Sematech in Austin, Texas, and SELETE in Japan, for the
purpose of evaluating 12-inch equipment and materials. While the primary use of
12-inch wafers in 1999 will continue to be for semiconductor device process and
tool development, MEMC expects to also ship samples of 12-inch prime polished
and epitaxial wafers.
    
 
PRODUCTS
 
     Our silicon wafers vary in diameter, surface features (polished or
epitaxial), composition, electrical properties and method of manufacture. Our
silicon wafers are manufactured according to the exacting specifications
required by our customers; we currently produce wafers with a variety of product
features satisfying more than 1,000 unique product specifications. Semiconductor
manufacturers require wafers of larger diameter and more stringent technical
specifications in order to produce increasingly complex semiconductor devices
such as the larger megabit memory chips and microprocessors.
 
     Our customers have increased their focus on efficient semiconductor
production processes because their manufacturing processes for semiconductor
devices have become more expensive. Our customers make many semiconductor
devices, or chips, from the same wafer, and all chips from a particular wafer
are manufactured and processed simultaneously at each stage in the device
manufacturing process. Because of this, larger-sized wafers allow for a greater
throughput from the same semiconductor manufacturing process and allow
semiconductor manufacturers to spread their fixed costs of production over a
larger volume of finished products. For example, a 6-inch (150 millimeter) wafer
has a surface area of approximately 27.4 square inches, whereas an 8-inch (200
millimeter) wafer has a surface area of approximately 48.7 square inches. Thus,
the 8-inch wafer has approximately 78% more surface area than the 6-inch wafer.
A 12-inch (300 millimeter) wafer has a surface area of approximately 109.6
square inches or approximately 125% more surface area than an 8-inch wafer.
Despite the industry's focus on 6-inch and larger diameter wafers, we continue
to manufacture and sell a significant amount of 4-inch (100 millimeter) and
5-inch (125 millimeter) wafers.
 
   
     We manufacture wafers in sizes ranging from 4 inches to 8 inches in
diameter as well as a limited number of 12-inch diameter wafers from our pilot
development lines. Customers use the larger diameter wafers in more
sophisticated applications where semiconductor manufacturers benefit from the
increased efficiencies and greater number of available die per wafer.
    
 
     Our silicon wafers fall into one of three general types:
 
Prime Polished Wafers
 
     Our principal product is the prime polished wafer, which is a highly
refined, pure silicon wafer with an ultraflat and ultraclean surface. We put
prime polished wafers through a sophisticated chemical-mechanical polishing
process that removes defects and leaves an extremely smooth surface. This makes
the wafers suitable for the advanced technologies used by our customers. Our
customers use prime polished wafers in a broad range of applications for
integrated circuit devices.
 
Epitaxial Wafers
 
     Customers have forced semiconductor manufacturers to use smaller and
smaller device features in order to incorporate more complex
                                       36
<PAGE>   38
 
functionality in the integrated circuit. Smaller devices also improve
performance and control power consumption and heat production. We manufacture
epitaxial wafers to serve the technological demands of our customers that
manufacture advanced semiconductors.
 
     Epitaxial wafers consist of a thin, single-crystal silicon layer grown on
the polished surface of the silicon wafer. The wafer is designed to have
different composition and electrical properties from the epitaxial layer on the
wafer surface. The wafer, among other things, helps to improve isolation between
circuit elements our customers fabricate on the silicon film surface of the
wafer. One result of such smaller devices is the requirement that the distance
between circuit elements becomes increasingly narrow. The industry refers to the
distance between circuit elements as line widths. A critical aspect in the
construction of any integrated circuit device is the isolation of these
different elements that comprise the integrated circuit device. Without
sufficient isolation of the various elements, the elements could communicate
electrically with each other, which could ruin the device. Epitaxial wafers
provide improved isolation and allow for increased reliability of the finished
semiconductor device, greater efficiencies during the semiconductor
manufacturing process, and ultimately more complex integrated circuit devices.
 
Test/Monitor Wafers
 
     We supply test/monitor wafers, or monitor wafers, to our customers for
their use in testing semiconductor fabrication lines and processes. Although
monitor wafers are substantially the same as prime polished wafers with respect
to cleanliness, and in some cases flatness, other specifications are generally
less rigorous. This allows us to produce monitor wafers from the portion of a
silicon ingot that does not meet customer specifications for wafers to be used
in the manufacture of semiconductors. Therefore, sales of monitor wafers allow
us to experience a higher yield from each silicon ingot produced.
 
RAW MATERIALS
 
     The main raw material in our production process is polysilicon. We produce
over one-half of our total polysilicon requirements and purchase the remainder
of our requirements from others. The availability of polysilicon currently
significantly exceeds demand. We believe that an adequate supply of polysilicon
will be available internally or from others for the foreseeable future.
 
     We obtain substantially all of our requirements for several raw materials,
equipment, parts and supplies from sole suppliers. Although we believe that we
could find adequate alternative sources of supply for these raw materials,
equipment, parts and supplies, we may be required to obtain new qualifications
from our customers in order to change or substitute suppliers. Because we cannot
predict whether we would be successful or how long that process would take, our
manufacturing yields could be adversely affected while we transition to a new
supplier.
 
   
     We believe that adequate quantities of all our key raw materials,
equipment, parts and supplies are currently available. However, because of the
cyclical nature of our industry, we may experience shortages in the future. See
"Risk Factors -- We Depend on Certain Suppliers and Finding Alternative Sources
Of Supply Could Affect Adversely Our Customer Qualifications And Manufacturing
Yields" on page 15.
    
 
MANUFACTURING PROCESS
 
     Silicon wafers for the semiconductor industry are extremely complex
materials with characteristics such as high purity levels, highly uniform
crystal structure, and precise mechanical tolerances. Electronic grade silicon
is one of the most refined materials in the world, having an impurity level of
no more than one part per billion. Requirements for highly uniform crystal
structure, mechanical tolerances and cleanliness in the manufacture of silicon
wafers are at levels that stretch manufacturing processes to the limits of
measurement, and necessitate that we conduct certain processes in "clean rooms."
 
     The silicon wafer manufacturing process consists of three principal phases:
the crystal growth process, the wafer slicing process and the wafer finishing
process.
 
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<PAGE>   39
 
Crystal Growth Process
 
     The first step in the wafer manufacturing process is the formation of a
large, silicon single crystal or ingot. This process begins with the melting of
polysilicon, together with minute amounts of electrically active elements such
as arsenic, boron, phosphorous or antimony in a quartz crucible.
 
     Once the melt has reached the desired temperature, we lower a silicon seed
crystal, or "seed" into the melt. The melt is slowly cooled to the required
temperature, and crystal growth begins around the seed. As the growth continues,
the seed is slowly extracted or "pulled" from the melt. The temperature of the
melt and the speed of extraction govern the diameter of the ingot, and the
concentration of an electrically active element in the melt governs the
electrical properties of the silicon wafers to be made from the ingot. This is a
complex, proprietary process requiring many control features on the
crystal-growing equipment.
 
Wafer Slicing Process
 
     After we grow the ingots, we extract them from the crystal pulling furnaces
and allow them to cool. We grind the ingots to the specified diameter, and then
we slice the ingots into thin wafers. Next, we prepare the wafers for the
surface polishing steps with a multi-step process using precision lapping
machines, edge contour machines and chemical etchers.
 
Wafer Finishing Process
 
     Final polishing and cleaning processes give the wafers the clean and
superflat mirror polished surfaces required for the fabrication of semiconductor
devices. For wafer polishing, we currently use our proprietary, ninth-generation
polishers together with our innovative chemical-mechanical polishing process.
This form of polishing was one of our early inventions that first allowed solid
state devices to move from individual circuits to the complexities of today's
integrated circuits. We further process some of our products into epitaxial
wafers.
 
RESEARCH AND DEVELOPMENT
 
     A number of factors drive our current research and development efforts.
These include our business strategy and focus mainly on:
 
     - the development and improvement of large diameter and advanced silicon
       wafer products,
 
     - manufacturing process improvements, and
 
     - enhancement and cost reduction of existing products.
 
Customer focus also influences research and development. We work closely with
customers in developing new products and refining existing products to faster
meet the needs of the marketplace. To strengthen this relationship and
interaction, we assign research and development application engineers to key
customer accounts worldwide.
 
     A recent product innovation of our research and development program
includes a new class of polished wafer with a virtually defect-free wafer
surface. We are currently delivering 6-inch and 8-inch diameters of this class
of polished wafer to customers for evaluation in increasing their yields. We
also engage in ongoing research and development to continuously improve the
surface of epitaxial wafers. Further, as a result of our commitment to develop
the next diameter of silicon wafers, we are now supplying high quality 12-inch
wafers to the industry from pilot development lines. We first produced our
12-inch diameter wafers in 1991 and believe we are one of the industry leaders
in the development of this next generation of wafers. Our new class of polished
wafer and 12-inch wafers are in the pilot stage of development, and we cannot
assure you that either will ever mature to a commercial product.
 
     We continue to see rapid technological change and product innovation in the
market for silicon wafer products. In response to this business environment, we
recently commissioned a "Wafering Center of Excellence" to direct our wafering
process research and development. The Wafering Center of Excellence is located
at our plant in Utsunomiya, Japan and has the capacity to produce 12-inch
wafers.
 
                                       38
<PAGE>   40
 
     We do not expect the demand for 12-inch wafers to develop until the year
2001 or beyond. In the interim, we expect semiconductor customers to continue
their support of two industry consortia to develop the tool set and processes
necessary to fabricate integrated circuits on 12-inch wafers.
 
MARKETING AND SALES
 
     We market most of our products through a direct sales force. We believe a
key element of our marketing strategy is establishing and maintaining close
relationships with our customers. We try to accomplish this through
multi-functional teams of technical, marketing and sales, and manufacturing
personnel. These teams work closely with customers in developing their new
production facilities, qualifying our products for use at such new facilities
and maintaining qualification at all existing manufacturing facilities. We
complete sales principally through indicative-only contracts of one year or less
that indicate expected volumes and specify price.
 
     Our close relationships with our customers are partly the result of the
lengthy and expensive "qualification" process by which customers qualify silicon
wafer manufacturers, and their individual facilities, to supply a particular
product. We are aware of changing customer needs and target our manufacturing to
try to produce wafers adapted to each customer's process and requirements. For
1998, the following ten customers generated over half of our sales:
 
     -  Advanced Micro Devices, Inc.;
 
     -  Chartered Semiconductor Manufacturing, Ltd.;
 
     -  Cypress Semiconductor Corporation;
 
     -  International Business Machines Corporation;
 
     -  Motorola, Inc.;
 
     -  National Semiconductor Corporation;
 
     -  Philips Electronics N.V.;
 
     -  Samsung Electronics Co., Ltd.;
 
     -  ST Microelectronics N.V.; and
 
     -  Texas Instruments Incorporated.
 
Texas Instruments alone represented more than 10% of our sales in 1998.
 
COMPETITION
 
   
     We face intense competition in the silicon wafer industry from established
manufacturers throughout the world. We believe that we possess certain
technological and other strengths relative to our competitors. However,
realizing and maintaining such strengths requires us to continue making a high
level of investment in research and development, marketing and customer service
and support. Our inability to maintain such investments could have a material
adverse effect on our operating results. For other risks related to competition,
see "Risk Factors -- We Experience Intense Competition in the Silicon Wafer
Industry And Our Customers Expect Continuing Technological Innovation At A Low
Cost" on page 11 and "Risk Factors -- Currency Exchange Rates and Increased
Competition Have Reduced Wafer Prices And Have Led To Lower Margins And Profits"
on page 12.
    
 
JOINT VENTURES
 
     We have entered into a number of joint ventures as part of our strategy to
leverage our capital, to enter expanding markets, to forge closer working
relationships with our principal customers and to broaden the geographic
diversification of our operations. We have joint ventures with prominent
partners in South Korea, Taiwan and the United States.
 
POSCO HULS Co., Ltd.
 
     In 1990, we entered into a joint venture in South Korea with Samsung
Electronic Co., Ltd. and Pohang Iron and Steel. Samsung is a South Korean
manufacturer of integrated circuits and one of our largest customers. Pohang is
a South Korean steel manufacturer. The South Korea joint venture is named POSCO
HULS Co., Ltd. (commonly known as PHC) and manufactures and sells silicon wafers
in South Korea. PHC generated sales of $121.0 million in 1998, $215.9 million in
1997, $275.1 million in 1996 and $180.5 million in 1995. Over half of PHC's
sales in each of these years were to Samsung. PHC has the capacity to produce
per month an aggregate of approximately 320,000 6-inch and 8-inch wafers.
 
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<PAGE>   41
 
We currently own 40% of PHC. Pohang currently owns 40% and Samsung currently
owns 20%.
 
     We have agreed to provide technical assistance and information to PHC. We
have also granted licenses to PHC to use certain technology to manufacture,
promote and sell silicon wafers. In exchange for such technical assistance and
licenses, we receive royalties. Through September 30, 1998 we received quarterly
royalties based on PHC's net sales. Effective October 1, 1998, the agreement by
which we provide technical assistance and information and have granted licenses
to PHC was amended. The amendment, among other things, extends the term of the
technical agreement. Under the amendment, we receive quarterly royalties based
on net sales and an annual royalty based on net income after taxes. The
quarterly royalties and the annual royalty we receive from PHC are separate and
independent calculations. Accordingly, if PHC has a net loss for the fiscal
year, then we will not receive an annual royalty based on net income after
taxes, but we will receive and retain the full amount of the quarterly royalties
based on net sales.
 
Taisil Electronic Materials Corporation
 
     In 1994, we formed Taisil Electronic Materials Corporation with China Steel
Corporation. China Steel Corporation is a Taiwanese steel manufacturer. Taisil
manufactures and sells silicon wafers in Taiwan. Taisil generated sales of $58.7
million in 1998, $61.6 million in 1997 and $7.2 million in 1996. Taisil did not
generate sales in 1995 because it did not finish construction of its
manufacturing facilities until May of 1996. Taisil has the capacity to produce
approximately 140,000 8-inch wafers per month. Taisil has in place
infrastructure that could support the production of approximately 240,000 8-inch
wafers per month. We currently own 45% of Taisil. The remainder of Taisil is
owned by China Steel Corporation (35%), Chao Tung Bank (10%) and the China
Development Corporation (10%).
 
     We have agreed to provide technical assistance and information to Taisil.
We have also granted licenses to Taisil to use certain technology to manufacture
and sell silicon wafers. In exchange for such technical assistance and licenses,
we receive semiannual royalties based on Taisil's net sales and operating
income.
 
   
     For other information regarding Taisil, see "Risk Factors -- We May Have to
Make Substantial Payments In Connection With Our Taisil Joint Venture, And This
Could Divert Funds From Other Needed Areas" on page 13 and "Recent Developments
- -- Taisil Electronic Materials Corporation" on page 21.
    
 
PROPRIETARY INFORMATION AND INTELLECTUAL PROPERTY
 
     As of November 30, 1998, we owned of record or beneficially approximately
112 U.S. patents, of which approximately 14 will expire by 2003, approximately
22 will expire between 2004 and 2008 and approximately 76 will expire after
2008. As of November 30, 1998, we owned of record or beneficially approximately
174 foreign patents, of which approximately 34 will expire by 2003,
approximately 79 will expire between 2004 and 2008 and approximately 61 will
expire after 2008. These foreign patents are generally counterparts of our U.S.
patents. We cannot assure you, however, that any of these patents will not be
challenged, invalidated or circumvented in the future, or that they do or will
provide a competitive advantage. As of that date, we had also submitted
approximately 96 U.S. and 440 foreign patent applications. However, we cannot
assure you that any of these applications will be granted.
 
     Despite our efforts to protect our proprietary rights, unauthorized parties
may attempt to copy or otherwise obtain and use our products or technology that
we consider proprietary, and third parties may attempt to develop similar
technology independently. In addition, effective protection of intellectual
property rights may be unavailable or limited in certain countries. Accordingly,
there can be no assurance that our means of protecting our proprietary rights
will be adequate or that our competitors will not independently develop similar
technology.
 
     Under certain contracts, we are required to indemnify some third parties
against claims of infringement of the intellectual property rights of others.
 
     Any litigation in the future to enforce patents issued to us, to protect
trade secrets or know-how possessed by us or to defend us or indemnify others
against claimed infringement of the rights of others could have a material
adverse effect on our financial condition and operating results. Also,
regardless of the validity or successful outcome of
 
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<PAGE>   42
 
such claims, we may need to expend significant time and expense to protect our
intellectual property rights or to defend against claims of infringement by
third parties, which could have a material adverse effect on us. If we lose any
such litigation, we may be required to:
 
     -  pay substantial damages;
 
     -  seek licenses from others; or
 
     -  change, or stop manufacturing or selling, some of our products.
 
     Any of these outcomes could have a material adverse effect on our business,
results of operations or financial condition.
 
LEGAL PROCEEDINGS
 
Equipment Purchase Dispute
 
     We have a dispute with a manufacturer of equipment for the production of
silicon wafers. The dispute involves our cancellation of an order for a number
of pieces of equipment. The manufacturer claims that we are obligated for
approximately $5 million for costs related to the cancelled order, including the
cost of inventory it has on hand and on order with its vendors. We are in the
process of evaluating the merits of the manufacturer's claim. The manufacturer
has advised us that if we are unable to resolve this dispute, it will file suit
against us. While we will assert all of our defenses in this dispute, we cannot
assure you that we will be able to resolve this dispute on terms favorable to
us.
 
Litigation Related To MEMC Pasadena
 
     In a case entitled Damewood vs. Ethyl Corporation, et al., (Case No.
96-38521), filed on August 1, 1996, three employees of the former operator of
MEMC Pasadena's plant, Albemarle Corporation, filed suit against us and others
in the 189th Judicial District Court, Harris County, Texas. The employees
alleged that they sustained injuries during an explosion at that plant on
January 27, 1996. We have settled this matter with plaintiffs and have been
dismissed as a party. One of the other defendants, Ethyl Corporation, was the
only defendant in this case at the time of trial in October 1998. A jury awarded
a verdict against Ethyl Corporation in the amount of $6.1 million.
 
     In July of 1996, two employees of the former operator of the MEMC Pasadena
plant were injured when flaming liquid escaped from a valve under repair. These
individuals filed suit on June 13, 1997, against us and others in a case
entitled Parden vs. Ethyl Corporation, et al. (Case No. 97-34857) in the 61st
Judicial District Court, Harris County, Texas. Plaintiffs are seeking actual and
exemplary damages in an unstated amount. We believe that we have meritorious
defenses to this cause of action. This case is currently set for trial on August
16, 1999.
 
     A demand against us for defense and indemnity in both these cases was made
on behalf of Ethyl Corporation by Albemarle Corporation on September 29, 1998.
Albemarle Corporation has assumed the obligation to defend and indemnify Ethyl
Corporation under an agreement in which Ethyl Corporation transferred ownership
of the plant where the injury took place to Albemarle Corporation. Albemarle
Corporation's demand for defense and indemnification against us on behalf of
Ethyl Corporation is under evaluation by our counsel. In early November, we made
a demand for indemnity in these cases against Albemarle. Demands for indemnity
made by Albemarle Corporation on behalf of Ethyl Corporation and by us are both
based on contractual indemnity language contained in the contract for the sale
of the MEMC Pasadena plant from Albemarle Corporation to us.
 
     In October 1997, a flash ignition occurred at the MEMC Pasadena plant.
Eleven employees of U.S. Contractors, Inc., a construction contractor, received
injuries from the impact. Three of these individuals have filed suit against us,
Albemarle Corporation and another party for injuries allegedly sustained in this
accident in a case entitled Larry Lambert, Andres Garcia and Rogers Patino vs.
MEMC Pasadena, Inc., (Cause No. 97-61639). The case was filed in the 152nd
Judicial District, Harris County, Texas. Two of these individuals allege head
injuries and all three allege hearing loss. The plaintiffs are seeking actual,
punitive and exemplary damages against the defendants in an unstated amount. We
believe all of the defendants have significant defenses to the plaintiffs'
claims.
 
     Pursuant to a construction contract between us and U.S. Contractors, Inc.,
U.S. Contractors, Inc. originally agreed to defend and indemnify us in this suit
up to $25 million. Under a contract between us and Albemarle Corporation, we are
                                       41
<PAGE>   43
 
   
contractually obligated to defend Albemarle
Corporation in this suit. We have also made a demand upon U.S. Contractors, Inc.
to defend and indemnify Albemarle Corporation pursuant to the construction
contract between us and U.S. Contractors, Inc. U.S. Contractors, Inc.'s
insurance carrier has recently indicated to us that it disputes the obligation
of U.S. Contractors, Inc. to defend and indemnify us and Albemarle Corporation
despite U.S. Contractors, Inc.'s prior agreement to defend and indemnify us.
    
 
   
     On March 18, 1999, the parties agreed in principal to a settlement of the
foregoing matter which will be covered by insurance. We anticipate that the
parties will execute agreements reflecting this settlement in the next several
weeks.
    
 
   
     Due to uncertainty regarding the litigation process, the scope and
interpretation of contractual indemnity provisions and the status of any
insurance coverage or pending settlements, we cannot assure you that the
ultimate outcome of the foregoing matters will not have a material adverse
effect on us.
    
 
Texas Nuisance Actions
 
     In a case entitled Crye, et al. vs. Reichhold Chemicals, Inc., et al. (Case
No. 97-24399), over 7,000 plaintiffs filed suit against MEMC Pasadena and
approximately 31 other companies operating industrial facilities along I-10 and
along the Houston Ship Channel in Harris County, Texas. The suit was filed in
the 334th Judicial District, Harris County, Texas. MEMC Pasadena was served in
this matter on December 30, 1998. In a similar case entitled Gerlich, et al. vs.
Merichem Company, et al. (Case No. 98-59745), almost 400 plaintiffs filed suit
against MEMC Pasadena and approximately 26 other companies operating industrial
facilities along I-10 and along the Houston Ship Channel in Harris County,
Texas. The suit was filed in the 80(th) Judicial District, Harris County, Texas.
MEMC Pasadena was served in this matter on February 2, 1999.
 
     In both cases, plaintiffs allege that defendants have discharged various
pollutants into the air, soil, ground and surface water. Plaintiffs also allege
that these facilities generate deafening noise, sickening foul odors and glaring
and intrusive lights. Plaintiffs have sued all defendants alleging nuisance,
trespass, negligence and gross negligence. Plaintiffs are seeking an injunction
and actual and exemplary damages in an unstated amount. We are in the process of
evaluating these lawsuits. Because these suits were only recently served on us,
we have not fully evaluated our potential exposure, if any. Due to the early
stage of our investigation of these lawsuits and the uncertainty regarding the
status of any insurance coverage, we cannot assure you that the ultimate outcome
of these matters will not have a material adverse effect on us.
 
   
     For certain other potential disputes see "Risk Factors -- Because The
Public Is Focusing More Attention On The Environmental Impact Of Our Industry
And Its Manufacturing Operations, Environmental Laws And Regulations May Become
More Stringent In The Future And Could Force MEMC To Expand Capital To Comply
With Such Laws" on page 15.
    
 
EMPLOYEES
 
   
     At January 31, 1999, we had approximately 6,000 full-time employees and 100
temporary workers worldwide. We intend to close our Spartanburg, South Carolina
facility in the first half of 1999 and withdraw from our joint venture in
Luoyang, China during the second quarter of 1999. As of January 31, 1999,
approximately 530 full-time employees worked at our Spartanburg, South Carolina
facility and joint venture in Luoyang, China.
    
 
     We have not experienced any material work stoppages at any of our
facilities during the last several years. We believe our relationships with
employees are satisfactory.
 
YEAR 2000
 
     Many existing software programs, computers and other types of equipment
were not designed to accommodate the Year 2000 and beyond. If not corrected,
these computer applications and equipment could fail or create erroneous
results. For us, this could disrupt purchasing, manufacturing, sales, finance
and other support areas and affect our ability to timely deliver silicon wafers
with the exacting specifications required by our customers, thereby causing
potential lost sales and additional expenses.
 
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<PAGE>   44
 
Our State of Readiness
 
     We have created a Year 2000 Project Team that is comprised of a Program
Office, including a Global Project Manager, Customer and Vendor Management
groups and Year 2000 representatives from all sites around the world, including
our unconsolidated joint ventures. This team is responsible for planning and
monitoring all Year 2000 activities and reporting to our executive management.
Our Chief Financial Officer is the sponsor for the Year 2000 project and reports
to our Board of Directors on a periodic basis.
 
     Our Year 2000 project encompasses both information and non-information
systems within MEMC as well as the investigation of the readiness of our
strategic suppliers/business partners. Our goal is to have all Year 2000 issues
resolved by June 1999, with Year 2000 issues relating to the most critical
business systems (i.e., financial, order processing) resolved by the first
quarter of 1999. To that end, we have inventoried and assessed the Year 2000
readiness of the following:
 
     -  In-house Applications -- Those applications that are developed and
        supported in-house or purchased applications that are heavily customized
        and supported in-house. This classification also includes
        end-user-developed applications deemed critical to the business.
 
     -  Business Software (Purchased) -- Applications purchased from an outside
        vendor and used for automating business processes (i.e., financial
        systems, order processing systems, purchasing systems).
 
     -  Manufacturing Software (Purchased) -- Applications purchased from an
        outside vendor and used for automating manufacturing processes.
 
     -  Personal Computer Software (Purchased) -- All software packages resident
        on personal computers. This includes things such as operating systems,
        word processing software, communications software, project management
        software, and spreadsheet software.
 
     -  Infrastructure Software (Purchased) -- Purchased software used in the
        client/server and network environments.
 
     -  IT Hardware -- Information Technology hardware components including
        midrange machines, personal computers, printers, network hardware.
 
     -  Facilities & Utilities -- Components in the office and manufacturing
        supporting systems environments. Types of components include: copy
        machines, fax machines, telephone/communications systems, security
        systems, fire alarm/control, electrical, waste treatment, alarms, and
        air handlers.
 
     -  Manufacturing Equipment -- Shop floor equipment such as clean rooms,
        crystal pullers, epitaxial reactors, inspection, lab, lappers, laser
        markers, measurement tools, grinders, polishers, slicers, and wet
        benches.
 
   
     In-House Applications.  We are evaluating the extent to which modifications
of our in-house applications will be necessary to accommodate the Year 2000 and
are modifying our in-house applications to enable continued processing of data
into and beyond the Year 2000. This phase of our Year 2000 project is
approximately 95% complete and we anticipate completing remediation and testing
of our in-house applications by the end of April 1999.
    
 
   
     Purchased Software.  We are obtaining, where feasible, contractual
warranties from systems vendors that their products are or will be Year 2000
compliant. We have completed approximately 100% of our Year 2000 project related
to business software, approximately 75% of our Year 2000 project related to
manufacturing software, and approximately 85% of our Year 2000 project for
personal computer software. We have substantially completed our Year 2000
project related to infrastructure software. We expect this phase of our Year
2000 project to be completed by the end of the second quarter of 1999. We
require Year 2000 contractual warranties from all vendors of new software and
hardware. In addition, we are testing newly purchased computer hardware and
software systems in an effort to ensure their Year 2000 compliance.
    
 
     Embedded Systems.  For in-house embedded systems, we are modifying our
systems to enable the continuing functioning of equipment into and beyond the
Year 2000. For third party embedded
 
                                       43
<PAGE>   45
 
   
systems, we are obtaining, where feasible, contractual warranties from systems
vendors that their products are or will be Year 2000 compliant. We have
completed this phase of our Year 2000 project for our hardware. We have
completed approximately 80% of our Year 2000 project with respect to facilities
and utilities, and approximately 70% of our Year 2000 project with respect to
manufacturing equipment. We anticipate having fully tested such embedded systems
by the end of the second quarter of 1999.
    
 
     Suppliers/Business Partners.  We have also communicated with our strategic
suppliers and equipment vendors seeking assurances that they will be Year 2000
ready. Our goal is to obtain as much detailed information as possible about our
strategic suppliers'/business partners' Year 2000 plans so as to identify those
companies which appear to pose a significant risk of failure to perform their
obligations to us as a result of the Year 2000. We have compiled detailed
information regarding all of our strategic suppliers and equipment vendors. This
analysis will be an ongoing process during our Year 2000 project. For those
strategic suppliers and equipment vendors that do not respond as to their status
or whose responses are not satisfactory, we intend to develop contingency plans
to ensure that sufficient resources are available to continue with business
operations.
 
Costs to Address the Year 2000
 
   
     Spending for modifications and updates is being expensed as incurred and is
not expected to have a material impact on our results of operations or cash
flows. The cost of our Year 2000 project is being funded through borrowings. We
estimate that our total incremental Year 2000 expenditures will be in the range
of $5-7 million. Through February 28, 1999, we have expended approximately $2.5
million of incremental costs which consists mainly of contracting programmers
and consulting costs associated with the evaluation, assessment and remediation
of computer systems and manufacturing equipment. We anticipate that contract
programming costs will be our most significant cost as the Year 2000 project
proceeds to completion.
    
 
Risk Analysis
 
     Like most large business enterprises, we are dependent upon our own
internal computer technology and rely upon the timely performance of our
suppliers/business partners. A large-scale Year 2000 failure could impair our
ability to timely deliver silicon wafers with the exacting specifications
required by our customers, thereby causing potential lost sales and additional
expenses. Our Year 2000 project seeks to identify and minimize this risk and
includes testing of our in-house applications, purchased software and embedded
systems to ensure that all such systems will function before and after the Year
2000. We are continually refining our understanding of the risk the Year 2000
poses to our strategic suppliers/business partners based upon information
obtained through our surveys. This refinement will continue into mid-1999.
 
Contingency Plans
 
     Our Year 2000 project includes the development of contingency plans for
business critical systems and manufacturing equipment as well as for strategic
suppliers/business partners to attempt to minimize disruption to our operations
in the event of a Year 2000 failure. We will be formulating plans to address a
variety of failure scenarios, including failures of our in-house applications,
as well as failures of strategic suppliers/business partners. We anticipate that
we will complete Year 2000 contingency planning by March 1999.
 
Cautionary Statement
 
     Year 2000 issues are widespread and complex. While we believe we will
address them on a timely basis, we cannot assure you that we will be successful
or that these problems will not materially adversely affect our business or
results of operations. To a large extent, we depend on the efforts of our
customers, suppliers and other organizations with which we conduct transactions
to address their Year 2000 issues, over which we have no control.
 
   
     The statements regarding the expected outcome and timing of Year 2000
efforts are forward-looking statements. Actual results could differ materially
from our expectations. See "Cautionary Statement Regarding Forward-Looking
Statements" beginning on page 17.
    
 
                                       44
<PAGE>   46
 
              CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS
 
   
     The VEBA group owns 66.0% of the outstanding shares of MEMC common stock,
including the shares of MEMC common stock purchased by VEBA Zweite in the
private placement. VEBA Corporation and VEBA Zweite are owned by VEBA AG and its
subsidiaries. On March 22, 1999, we sold 15,399,130 shares of MEMC common stock
to VEBA Zweite at $6.89 per share for aggregate net proceeds of approximately
$105.9 million. See "Recent Developments -- Financial Restructuring
Plan -- Private Placement to VEBA Zweite and the Rights Offering" on page 20.
VEBA Zweite has also agreed to purchase all shares not subscribed for by other
stockholders in the rights offering, subject to certain conditions that are
customary in a firm commitment underwriting. See "The Rights Offering -- Standby
Agreement with VEBA Zweite" on page 33.
    
 
     In an effort to minimize conflicts of interest by members of our Board of
Directors affiliated with VEBA AG or other related parties, the Audit Committee
generally approves or ratifies any material transaction with a related party.
Our Audit Committee currently consists of two independent directors.
 
     In 1998, we made payments to VEBA Corporation and certain of its affiliates
for raw materials, equipment, office space, services, credit commitments and
interest. We also reimbursed VEBA Corporation and certain of its affiliates for
certain insurance premiums paid on our behalf. The following discussion
summarizes our significant agreements and arrangements with VEBA Corporation and
its affiliates.
 
   
SERVICE AGREEMENTS
    
 
     We have entered into a service agreement with VEBA Corporation (as
successor to Huls Corporation), which requires VEBA Corporation to provide us
with accounting services and office space. According to the terms of the service
agreement, either party may terminate the service agreement at any time on 30
days' notice. The service agreement also may be modified from time to time by
mutual consent of the parties. We believe that the terms of the service
agreement are comparable to terms that we could obtain from unrelated third
parties. We terminated our accounting services with VEBA Corporation during
1998. In 1998, we paid VEBA Corporation approximately $478,000 under this
agreement.
 
     We had arrangements with an affiliate of VEBA AG that permitted this
affiliate to use our computer hardware to implement its software systems. The
affiliate paid us $67,000 in 1998 pursuant to these arrangements. These
arrangements terminated in 1998.
 
AGREEMENT FOR COMMUNICATION SERVICES
 
     We have an arrangement with VEBA Corporation covering our communication
service needs. Our arrangement allows us to participate with VEBA Corporation
and several of its affiliates in a communication services agreement between VEBA
Corporation and AT&T. The term of the communication services agreement expires
in 2001. In return for volume pricing discounts, VEBA Corporation provided AT&T
with minimum revenue commitments for each contract year during the term of the
communication services agreement. We entered into a reimbursement agreement with
VEBA Corporation which requires us to reimburse VEBA Corporation if our payments
to AT&T under the communication services agreement do not meet certain specified
minimum levels for each contract year. Because of the combined volume of VEBA
Corporation and its affiliates (including our volume), we believe that the
pricing terms available to us under the communication services agreement are no
less favorable than we could obtain if we independently entered into a contract
for similar communication services. To date, we have not made any reimbursement
payments to VEBA Corporation under this agreement.
 
LOAN AGREEMENTS AND GUARANTEES
 
   
     We have entered into credit and loan arrangements with VEBA AG and its
affiliates. See "Recent Developments -- Financial Restructuring Plan -- Debt
Restructuring" beginning on page 20 and "Recent Developments -- Short Term Line
of Credit With An Affiliate of VEBA AG" on page 22. We and an affiliate of VEBA
AG have guaranteed certain indebtedness of PHC with an aggregate principal
amount outstanding of approximately $581,000 as of January 31, 1999, which
matures in March 1999. Neither we nor the affiliate of VEBA AG has been required
to make
    
                                       45
<PAGE>   47
 
any payments under these guarantees. We have agreed to indemnify the affiliate
of VEBA AG with respect to its guarantee. We have agreed to pay the affiliate of
VEBA AG an annual fee of 1/8 of one percent calculated on the outstanding
principal balance under the PHC credit agreements for this guarantee. In 1998,
we incurred approximately $47.9 million in interest, commitment fees and other
financing fees to VEBA Corporation and certain of its affiliates.
 
TAX AGREEMENTS
 
     From 1990 to 1995, we were a party to various tax sharing agreements with
VEBA Corporation and its affiliates. The tax sharing agreements provided a
method to determine each party's respective federal income tax liabilities. In
1995, we entered into a tax disaffiliation agreement with VEBA Corporation
terminating the tax sharing agreements. As a result, we are now responsible for
our own federal, state, and local tax returns and tax liabilities. Pursuant to
the terms of the tax disaffiliation agreement, we agreed with VEBA Corporation
to indemnify each other from and against any additional federal income tax
liability attributable to each other's operations that is determined to be due
with respect to taxable periods covered by the tax sharing agreements.
 
REGISTRATION RIGHTS AGREEMENT
 
     Pursuant to a registration rights agreement, as amended in connection with
the private placement, we granted VEBA AG and its affiliates the right to demand
registration under the Securities Act of 1933 of its shares of MEMC common
stock, including shares purchased in the private placement and shares that may
be purchased under the standby commitment or otherwise. The demand rights are
exercisable and must be exercised for at least 25% of MEMC common stock covered
by the registration rights agreement. We may be required to effect up to three
such demand registrations. VEBA AG and its affiliates will bear the expenses of
any such demand registration. We are not obligated to take any action to
register shares of MEMC common stock owned by VEBA AG and its affiliates:
 
     -  during the period starting 30 days prior to the estimated date of filing
        of, and ending 90 days after the effective date of, any other
        registration statement filed by us under the Securities Act;
 
     -  more than once during any six-month period; and
 
     -  for up to 90 days after a request from VEBA AG or its affiliates if our
        president certifies that our Board of Directors has determined that such
        registration would interfere with a material transaction then being
        pursued by us.
 
In addition, except in certain circumstances and subject to certain limitations,
if we propose to register any shares of MEMC common stock under the Securities
Act, VEBA AG or any affiliate of VEBA AG will be entitled to require us to
include all or a portion of the shares of MEMC common stock which VEBA AG or
such affiliate owns in such registration. We will bear the expenses of any such
"piggyback" registration, other than underwriting discounts, commissions and
filing fees relating to MEMC common stock to be sold by VEBA AG or its
affiliates. In addition, we have agreed to indemnify any underwriter in
connection with any registration made pursuant to the registration rights
agreement against certain liabilities, including liabilities under the
Securities Act.
 
TREASURY MANAGEMENT
 
     Pursuant to an informal arrangement, we participate in VEBA AG's global
treasury management system. As a condition to our participation, we offer VEBA
AG or an affiliate a right of first refusal to act as our financial intermediary
in transacting our currency hedging activities. As a result of this arrangement,
we have entered into a number of foreign exchange hedging contracts using VEBA
AG or an affiliate as our financial intermediary. We believe that our hedging
arrangements with VEBA AG or an affiliate allow for transactions on terms that
are comparable to terms available from unrelated third party financial
intermediaries. Consistent with our past practice, we may deposit with VEBA AG
or certain of its affiliates on a short term basis our excess cash on hand at
market rates of interest. We believe that the interest rates received under
these short term arrangements are comparable to market rates received for
similar transactions from non-affiliated persons. The treasury management
arrangements may be modified from time to time or
 
                                       46
<PAGE>   48
 
terminated at any time on short notice, either by us or VEBA AG or certain
affiliates.
 
AGENCY AND SERVICES AGREEMENTS WITH AFFILIATED COMPANIES
 
     Through our wholly owned Italian subsidiary, MEMC Electronic Materials,
S.p.A. and certain other foreign subsidiaries, we distributed our silicon
products and silicon products manufactured by affiliated companies in various
European countries and South Korea under certain agency and services agreements
that covered the distribution arrangements. In the agency agreements, affiliates
of VEBA AG provided sales agency, administrative and other related services to
MEMC Electronic Materials, S.p.A. in conjunction with the distribution of
silicon products in the various countries. In return for these services, MEMC
Electronic Materials, S.p.A. paid these affiliates of VEBA AG on a commission or
cost plus commission basis. During 1998, we terminated these agency agreements.
We believe that the terms of the agency agreements were comparable to those that
we could have obtained from unrelated third parties. In 1998, we paid
approximately $1.5 million to affiliates of VEBA AG under these agency
agreements.
 
PURCHASES AND SALES OF RAW MATERIALS, FINISHED PRODUCTS AND EQUIPMENT
 
     We purchase raw materials from an affiliate of VEBA AG pursuant to a supply
contract dated December 31, 1995. The supply contract has a term of five years.
We believe that the prices we pay for raw materials under this supply contract
are not materially different from those which we could obtain from third parties
for similar products. In 1998, we paid approximately $7.8 million for raw
materials purchased under this supply contract.
 
     We also have purchased equipment from Steag Microtech, Inc., an entity in
which VEBA AG holds a significant minority ownership interest. We believe that
the price we paid for this equipment was not materially different from the price
that we could have obtained from unrelated third parties for comparable
equipment. In 1998, we purchased approximately $6.1 million of equipment from
Steag Microtech, Inc.
 
SAP SOFTWARE SUBLICENSE
 
     We expect to obtain the use of SAP R/3 software to integrate our business
processes through a sublicense from VEBA AG. However, if we were to cease being
an indirect subsidiary of VEBA AG, we may incur higher maintenance charges from
SAP AG or its affiliates because of our inability to continue to benefit from
VEBA AG's volume pricing.
 
INSURANCE
 
     We participate in a marine cargo insurance policy maintained by VEBA AG or
an affiliate. In 1998, we paid premiums of $60,980 under this policy. We also
participate in a blended liability insurance policy sponsored by an unrelated
third party. Our participation in the blended liability policy was arranged by
VEBA AG. The premiums on the blended liability policy are paid by VEBA AG on our
behalf. We reimburse VEBA AG for these premiums. In 1998, we reimbursed VEBA AG
in the amount of $1.4 million for a three-year premium paid under this policy.
We believe that the total premiums paid for the marine cargo policy and the
blended liability policy are comparable to premiums that are available from
unrelated third parties.
 
                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
     Bryan Cave LLP, our special counsel, has advised us that the following
discussion as to legal matters is its opinion as to the material United States
federal income tax consequences of the rights offering. Their opinion is based
on current provisions of the U.S. Internal Revenue Code of 1986, as amended,
applicable final, temporary and proposed Treasury Regulations, judicial
authority, and current administrative rulings and pronouncements of the Internal
Revenue Service, and upon the facts concerning MEMC as of today. We cannot
assure you that the Internal Revenue Service will not disagree with their
opinion, and we are not requesting a ruling from the Internal Revenue Service.
Legislative, judicial or administrative changes or interpretations may be issued
in the future that could alter or modify their opinion. Such changes or
interpretations could be
 
                                       47
<PAGE>   49
 
retroactive and therefore affect the tax consequences to you.
 
     Moreover, the opinion of Bryan Cave LLP does not purport to fully address
all aspects of federal income taxation that may be relevant to you, especially
if you are subject to special treatment under the federal income tax laws. For
example, if you are a bank, dealer in securities, life insurance company,
tax-exempt organization or foreign taxpayer, this discussion may not cover all
relevant tax issues. Also this opinion does not address applicable tax
consequences if you hold MEMC common stock as part of a hedging, straddle,
constructive sale, conversion or other risk reduction transaction. This opinion
also does not address any aspect of state, local or foreign tax laws.
 
     This opinion is only applicable to you if you hold MEMC common stock,
and/or will hold the rights and any shares of MEMC common stock you acquire upon
the exercise of rights, as capital assets (generally, property held for
investment) within the meaning of Section 1221 of the Internal Revenue Code. YOU
SHOULD CONSULT YOUR OWN TAX ADVISORS TO DETERMINE THE SPECIFIC TAX CONSEQUENCES
OF THE RIGHTS OFFERING TO YOU.
 
ISSUANCE OF THE RIGHTS
 
     If you hold MEMC common stock on the record date, more likely than not you
will not be required to recognize taxable income upon the receipt of the rights.
 
     Subject to certain exceptions, a distribution by a corporation to its
stockholders of rights to acquire stock in the distributing corporation is not
taxable. An exception to this general rule applies in the case of a distribution
which constitutes a "disproportionate distribution" with respect to any class or
classes of stock of the corporation. A distribution of stock rights constitutes
a "disproportionate distribution" if it is a part of a distribution or a series
of distributions (including deemed distributions) that has the effect of the
receipt of property (including cash) by some stockholders and an increase in the
proportionate interests of other stockholders in the assets or earnings and
profits of the distributing corporation.
 
     The distribution of the rights to all stockholders except the VEBA group,
more likely than not, will not constitute a taxable distribution based on
representations by MEMC that:
 
     -  the private placement to VEBA Zweite was made with the expectation of
        promptly thereafter making the distribution of rights to the remaining
        stockholders, which may be exercised on the same economic terms as the
        private placement,
 
     -  there is a single class of stock outstanding, and
 
     -  there has not been nor is there expected to be any property
        distributions to any stockholder in connection with the distribution of
        rights.
 
     If despite these representations, the Internal Revenue Service were to
conclude that the distribution of rights is independent from the private
placement to VEBA Zweite and there were other property distributions to
shareholders in connection with the distribution of rights, based on the absence
of any direct authority, the Internal Revenue Service could treat the
distribution of rights as a taxable distribution, with the result that a person
receiving a right would recognize a dividend, taxable as ordinary income, in an
amount equal to the fair market value of the right received, but only to the
extent of the current and accumulated earnings and profits of MEMC. To the
extent the deemed distribution exceeds the current and accumulated earnings and
profits of MEMC, such excess would be treated first as a nontaxable recovery of
adjusted tax basis in the MEMC common stock with respect to which the right was
distributed and then as gain from the sale or exchange of the MEMC common stock.
A person's tax basis in a right received in a taxable distribution would equal
the fair market value of the right as of the date of distribution of the right.
A person's holding period in the rights would begin on the day following the
date of distribution of the rights. We intend to treat the distribution of
rights as a nontaxable distribution.
 
     Except as provided above, the following discussion assumes that the
distribution of the rights will be treated as a nontaxable distribution.
 
                                       48
<PAGE>   50
 
BASIS AND HOLDING PERIOD OF THE RIGHTS
 
     If you hold MEMC common stock on the record date, your basis in the rights
received by you will be zero. If, however, either
 
     -  the fair market value of the rights on the date we issue the rights is
        15% or more of the fair market value (on that same date) of MEMC common
        stock (which could occur if unanticipated market demand for rights
        develops); or
 
     -  you properly elect under Section 307 of the Internal Revenue Code in
        your federal income tax return to allocate part of the basis of your
        MEMC common stock to the rights;
 
then your basis in your shares of MEMC common stock will be allocated between
the MEMC common stock and the rights in proportion to the fair market values of
each on the date we issue the rights.
 
     The holding period of your rights will include your holding period (as of
the date of issuance) for the MEMC common stock with respect to which we
distributed the rights to you.
 
     If you purchase rights, your basis in the rights will be equal to your
purchase price for the rights. Your holding period for those rights will begin
on the date following the date you purchase the rights.
 
TRANSFER OF THE RIGHTS
 
     If you sell or exchange your rights, you generally will recognize gain or
loss equal to the difference between the amount you realized and your basis, if
any, in the rights. Such gain or loss generally will be capital gain or loss so
long as you held the rights as a capital asset at the time of the sale or
exchange. Gain or loss from an asset held for more than one year will generally
be taxable as long term capital gain or loss. If you recognize any such long
term capital gain, the Internal Revenue Service will generally tax such gain at
a maximum rate of 20%.
 
EXPIRATION OF THE RIGHTS
 
     If your basis in your rights is zero, and you allow your rights to expire
unexercised, you will not recognize any gain or loss.
 
     If you have a basis in your rights and you allow your rights to expire
unexercised, you will recognize a loss equal to the basis of those rights. Any
loss you recognize on the expiration of your rights will be a capital loss if
the MEMC common stock obtainable by you after the exercise of the rights would
be a capital asset.
 
EXERCISE OF THE RIGHTS; BASIS AND HOLDING PERIOD OF ACQUIRED SHARES
 
     You will not recognize any gain or loss upon the exercise of your rights.
Your basis in each share of MEMC common stock you acquire through exercise of
your rights will equal the sum of the subscription price you paid to exercise
your rights and your basis, if any, in the rights. Your holding period for the
MEMC common stock you acquire through exercise of your rights will begin on the
date you exercise your rights.
 
SALE OR EXCHANGE OF COMMON STOCK
 
     If you sell or exchange shares of MEMC common stock, you will generally
recognize gain or loss on the transaction. The gain or loss you recognize is
equal to the difference between the amount you realize on the transaction and
your basis in your shares you sold. Such gain or loss generally will be capital
gain or loss so long as you held the shares as a capital asset at the time of
the sale or exchange. Gain or loss from an asset held for more than one year
will generally be taxable as long term capital gain or loss. If you recognize
any such long term capital gain, the Internal Revenue Service will generally tax
such gain at a maximum rate of 20%.
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
     Under the backup withholding rules of the Internal Revenue Code, you may be
subject to 31% backup withholding with respect to any reportable payments made
to you pursuant to the rights offering. You will not be subject to backup
withholding if you:
 
     -  Are a corporation or fall within certain other exempt categories and,
        when required, demonstrate that fact; or
 
     -  Provide a correct taxpayer identification number and certify under
        penalties of perjury that your taxpayer identification number is correct
        and that you are not subject to backup withholding because
 
                                       49
<PAGE>   51
 
        you previously failed to report all dividends and interest income.
 
     Any amount withheld under these rules will be credited against your federal
income tax liability. We may require you to establish your exemption from backup
withholding or make other arrangements with respect to the payment of backup
withholding.
 
     YOU SHOULD CONSULT YOUR OWN TAX ADVISORS REGARDING THE CONSEQUENCES OF THE
RIGHTS OFFERING TO YOUR PARTICULAR TAX SITUATION, INCLUDING STATE AND LOCAL
INCOME AND OTHER TAX LAWS.
 
                                       50
<PAGE>   52
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The following is a summary of our capital stock and highlights some of the
provisions of our Certificate of Incorporation and By-Laws. We have also
summarized a provision of the General Corporation Law of Delaware (commonly
known as the DGCL). Since the terms of our Certificate of Incorporation and
By-Laws, and the DGCL may differ from the general information we are providing,
you should only rely on the actual provisions of the Certificate of
Incorporation, the By-Laws or the DGCL. If you would like to read the
Certificate of Incorporation or By-Laws, they are on file with the Securities
and Exchange Commission.
 
GENERAL
 
     Our authorized capital stock consists of 200,000,000 shares of common
stock, par value $0.01 per share, and 50,000,000 shares of preferred stock, par
value $0.01 per share.
 
COMMON STOCK
 
     As a holder of MEMC common stock, you are entitled to one vote for each
share held of record on all matters submitted to a vote of the stockholders. You
are entitled to receive dividends declared by our Board of Directors. The right
of our Board of Directors to declare dividends, however, is subject to the
rights of any holders of our preferred stock and the availability of sufficient
funds to pay the dividends. See "Dividend Policy" on page 23. If we liquidate
MEMC, you will be entitled to share ratably with the other stockholders in the
distribution of all assets that we have left after we pay all of our
liabilities, and all of our obligations to the holders of preferred stock. You
have no preemptive rights to subscribe for additional shares of MEMC and no
right to convert your MEMC common stock into any other securities. In addition,
you do not have the benefit of a sinking fund for your shares of MEMC common
stock. Your MEMC common stock is not redeemable by us.
 
PREFERRED STOCK
 
     Your rights as a holder of MEMC common stock may be affected by any
preferred stock that we may issue. As of the date of this prospectus, we have
not issued any preferred stock and we do not have any plans to issue any
preferred stock in the future. However, our Board of Directors is authorized to
issue up to 50,000,000 shares of preferred stock. The issuance of preferred
stock could adversely affect your voting power as a holder of MEMC common stock
and could have the effect of delaying, deferring or impeding a change in control
of MEMC.
 
     If we authorize the issuance of preferred stock, our Board of Directors has
the authority to determine whether any or all shares of authorized preferred
stock should be issued as a class without series or in one or more series and to
fix the rights, preferences, privileges and restrictions of the preferred stock.
The rights and restrictions on the preferred stock may include dividend rights,
conversion rights, voting rights, terms of redemption, liquidation preferences
and the number of shares constituting any series.
 
SHARES OWNED BY THE VEBA GROUP
 
   
     The 36,890,072 shares owned by the VEBA group (50,518,518 shares, if no
rights holder (other than the VEBA group) exercises its rights) are not freely
transferable. The VEBA group may not sell its shares without registration under
the Securities Act of 1933 unless an exemption from registration is available,
such as under Rule 144. Under Rule 144, the VEBA group may sell, within any
three-month period, a number of shares that does not exceed the greater of one
percent of the then outstanding shares of MEMC common stock and the average
weekly trading volume during the four calendar weeks preceding such sale. We
have granted to VEBA AG and its affiliates certain registration rights, as
described under "Certain Relationships and Related Party Transactions --
Registration Rights Agreement" on page 46.
    
 
PROVISIONS OF THE CERTIFICATE OF INCORPORATION AND BY-LAWS THAT MAY HAVE
ANTI-TAKEOVER EFFECTS
 
     Certain provisions of our Certificate of Incorporation and By-Laws may have
an anti-takeover effect. These provisions may delay, defer or make more
difficult a takeover attempt of MEMC that you may consider not to be in your
best interest. However, because the VEBA group can currently (and after the
rights offering will continue to be able to) elect all members of our Board of
Directors and control the outcome of most matters
                                       51
<PAGE>   53
 
submitted to a vote of stockholders, such provisions currently have limited
significance to you. See "Risk Factors -- VEBA AG's Control of MEMC Could
Prevent a Favorable Acquisition of MEMC" on page 10.
 
Board of Directors
 
     Our Certificate of Incorporation provides the following concerning our
Board of Directors:
 
     -  The Board of Directors is divided into three classes; each class
        contains a relatively equal number of members;
 
     -  Members of the Board of Directors serve in staggered three-year terms,
        so approximately one-third of the members are elected annually;
 
     -  The number of members on the Board of Directors is between five and
        fifteen;
 
     -  Directors may be removed with or without cause by the holders of a
        majority of the shares of capital stock then entitled to vote at an
        election of directors; and
 
     -  Vacancies on the Board of Directors may be filled by a majority of the
        remaining members of the Board of Directors, unless any director
        determines that the stockholders should fill the vacancy.
 
Stockholder Consents and Special Meetings
 
     Our Certificate of Incorporation provides that you and the other
stockholders may take action only by unanimous written consent if the action is
not taken at a meeting of stockholders. Our By-Laws provide that special
meetings of stockholders may be called only upon the request of the holders of a
majority of the outstanding MEMC common stock, by the Chairman of the Board or
by a majority of the Board of Directors.
 
Stockholder Proposals or Nominations
 
     To bring a stockholder proposal you must follow the procedures set forth in
our By-Laws and to nominate a candidate to our Board of Directors, you must
follow the procedures set forth in our Certificate of Incorporation. The advance
notice procedures bringing either a stockholder proposal at an annual meeting or
a stockholder nomination for a candidate for the Board of Directors at an annual
meeting or special meeting called for the purpose of electing directors, are
summarized as follows:
 
     -  Your proposal or nomination must be received by our Secretary not less
        than 60 days and not more than 90 days before (after the 1999 annual
        meeting this period for a stockholder proposal will be not less than 90
        days and not more than 120 days before) the anniversary date of the
        previous annual meeting of stockholders, or
 
     -  If the meeting is not held within 30 days of the anniversary date of the
        previous annual meeting or if the meeting is a special meeting called
        for the purpose of electing directors, then your proposal or nomination
        must be received by the Secretary within 10 days after the notice of the
        meeting is mailed to stockholders.
 
     You must include the following information in your notice of a stockholder
proposal:
 
     -  A brief reasoned description of the business to be brought at the
        meeting;
 
     -  Your name and record address;
 
     -  The class and number of shares of capital stock you own either of record
        or beneficially;
 
     -  A description of any agreements you may have with other persons in
        connection with the proposal; and
 
     -  A representation that you will appear in person or by proxy at the
        meeting.
 
     Your notice of a nomination of a candidate to our Board of Directors must
include the following:
 
     -  The name, age, business address and residence of the nominee;
 
     -  The principal occupation of the nominee;
 
     -  The class and number of shares of our capital stock the nominee owns;
 
     -  Your name and record address;
 
     -  The class and number of shares of capital stock you own;
 
     -  A description of any agreements you may have with the nominee;
 
     -  A representation that you will appear in person or by proxy at the
        meeting; and
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<PAGE>   54
 
     -  Other information regarding the nominee and yourself as required by the
        Securities Exchange Act of 1934, as amended.
 
Limitation of Liability of Directors
 
     The Certificate of Incorporation limits the Directors' liability to
stockholders and MEMC. Specifically, a director is not liable to MEMC or you, as
one of its stockholders, for monetary damages for breach of fiduciary duty as a
director, except for liability for a director's
 
     -  Breach of his or her duty of loyalty to MEMC or our stockholders;
 
     -  Acts or omissions that are either not in good faith or which involve his
        or her intentional misconduct or a knowing violation of law;
 
     -  Unlawful dividend payments or stock redemptions or repurchases pursuant
        to Section 174 of the DGCL; and
 
     -  Participation in a transaction from which he or she received an improper
        personal benefit.
 
     The effect of these provisions on you is to eliminate your rights and our
rights (through stockholders' derivative suits on behalf of MEMC) to recover
monetary damages against a director for breach of fiduciary duty as a director
(including breaches resulting from grossly negligent behavior), except in the
situations described above. These provisions, however, will not limit the
liability of directors to you under federal securities laws.
 
SECTION 203 OF DELAWARE GENERAL CORPORATION LAW
 
     Because we are a Delaware corporation, Delaware law may have an effect on
your rights as a stockholder. In particular, Section 203 of the DGCL prohibits
certain transactions between a Delaware corporation and an "interested
stockholder." An interested stockholder is defined as a person who, together
with any affiliates or associates of such person, beneficially owns, directly or
indirectly, 15% or more of the outstanding voting shares of a Delaware
corporation. This provision prohibits certain business combinations between an
interested stockholder and a corporation for a period of three years after the
date the interested stockholder becomes an interested stockholder. The term
"business combination" is broadly defined to include mergers, consolidations,
sales or other dispositions of assets having a total value in excess of 10% of
the consolidated assets of the corporation, and certain transactions that would
increase the interested stockholder's proportionate share ownership in the
corporation.
 
     This prohibition is effective unless:
 
     -  The business combination is approved by the corporation's board of
        directors prior to the time the interested stockholder becomes an
        interested stockholder;
 
     -  The interested stockholder acquired at least 85% of the voting stock of
        the corporation (other than stock held by directors who are also
        officers or by certain employee stock plans) in the transaction in which
        it becomes an interested stockholder; or
 
     -  The business combination is approved by a majority of the board of
        directors and by the affirmative vote of 66 2/3% of the outstanding
        voting stock that is not owned by the interested stockholder.
 
     In general, the prohibitions do not apply to business combinations with
persons who became interested stockholders prior to the corporation becoming
subject to Section 203, which generally takes place when a corporation's voting
stock becomes publicly traded or is held of record by more that 2,000
stockholders. VEBA Corporation is not subject to the restrictions on "business
combinations" under Section 203. Moreover, for purposes of Section 203, our
Board of Directors has approved of the transfer of shares of MEMC common stock
by VEBA Corporation to VEBA Zweite, VEBA AG or one of its specified
subsidiaries. Because of this approval, we may engage in the future in any
"business combination" with any of these parties as well as VEBA Corporation.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for MEMC common stock and the rights is
Harris Trust and Savings Bank, 111 West Monroe, P.O. Box 755, Chicago, Illinois
60690.
 
                                       53
<PAGE>   55
 
                              PLAN OF DISTRIBUTION
 
     We are making this rights offering directly to you, the holders of MEMC
common stock other than the VEBA group. We have retained NationsBanc Montgomery
Securities LLC and J.P. Morgan Securities Inc. to act as the dealer managers in
connection with the rights offering. The dealer managers have accompanied us on
meetings that we have had with certain investors after the filing of the
registration statement to solicit their participation in the rights offering,
and may continue to solicit participation by investors throughout the rights
offering. The dealer managers are not obligated, and do not intend, to purchase
any of the shares offered in the rights offering.
 
     We will pay the dealer managers a fee of $1,200,000. We have agreed to pay
NationsBanc Montgomery Securities LLC $500,000 in connection with certain
additional advisory services it is performing. In addition, we will reimburse an
estimated $270,000 of the dealer managers' expenses incurred in connection with
the rights offering.
 
     The total compensation MEMC will pay to the dealer managers, including
reimbursement of estimated expenses, is as follows:
 
<TABLE>
<S>                                 <C>
NationsBanc Montgomery Securities
  LLC.............................  $1,237,500
J.P. Morgan Securities Inc........  $  732,500
                                    ----------
                                    $1,970,000
                                    ==========
</TABLE>
 
     We will pay Morrow & Co., Inc., the information agent, a fee of
approximately $16,000 and Harris Trust and Savings Bank, the subscription agent,
a fee of approximately $20,000.
 
     We estimate that our total expenses in connection with the rights offering,
including fees to the dealer managers, Morrow & Co., Inc., and Harris Trust and
Savings Bank, will be $2,787,005.
 
     We have agreed to indemnify the dealer managers for certain liabilities,
including civil liabilities under the Securities Act of 1933. We have also
agreed to contribute to payments that the dealer managers may need to make
arising out of such liabilities.
 
     Other than the dealer managers, we have not employed any brokers, dealers
or underwriters in connection with the solicitation of exercise of rights.
Except as described in this section, we are not paying any other commissions,
fees or discounts in connection with the rights offering. Some of our employees
may solicit responses from you as a holder of rights, but we will not pay our
employees any commissions or compensation for such services other than their
normal employment compensation.
 
     Until the distribution of the MEMC common stock in the rights offering is
completed, the rules of the Securities and Exchange Commission may limit the
ability of the dealer managers to bid for and purchase MEMC common stock. As an
exception to these rules, the dealer managers are permitted to engage in certain
transactions that stabilize the price of the MEMC common stock so long as
stabilizing bids do not exceed a specified maximum. The dealer managers do not
currently intend to engage in stabilizing transactions. However, if they do
engage in stabilizing transactions, such transactions will occur on the New York
Stock Exchange and in compliance with the rules of the SEC, and will consist of
bids or purchases for the purpose of pegging, fixing or maintaining the price of
the MEMC common stock. In general, purchases of a security for the purpose of
stabilization could cause the price of the security to be higher than it might
be in the absence of such purchases. Neither we nor either of the dealer
managers makes any representation or prediction as to the direction or magnitude
of any effect that the transactions described above may have on the price of the
MEMC common stock. In addition, neither we nor either of the dealer managers
makes any representation that the dealer managers will engage in such
transactions or that such transactions, once commenced, will not be discontinued
without notice.
 
     The dealer managers are also acting as our financial advisors in connection
with the rights offering. In their capacity as financial advisors, they have
advised us regarding the size, pricing and structure of the private placement to
VEBA Zweite and the rights offering. Their advice has included assistance in
determining the purchase price for the private placement, the subscription
price, and the impact of the private placement and
 
                                       54
<PAGE>   56
 
the rights offering on us and our stockholders from a financial point of view.
They have also discussed with management and the special committee of the Board
of Directors the possible effects of the private placement and the rights
offering. NationsBanc Montgomery Securities LLC also performed analyses to
assist us in determining the appropriate and desirable pricing terms for the
private placement and the rights offering. The dealer managers are not making a
recommendation as to whether or not you should exercise your rights. You should
make your decision based on your own assessment as to whether to exercise your
rights.
 
     The dealer managers or some of their affiliates have performed in the past
and may perform in the future other financial advisory and investment banking
services for us. We have paid, and may in the future pay, such parties
compensation for their services. In addition, affiliates of J.P. Morgan
Securities Inc. have performed financial advisory and investment banking
services for VEBA AG and its affiliates, and a retired vice chairman and
director of an affiliate of J.P. Morgan Securities Inc. is a member of the
supervisory board of VEBA AG.
 
                                    LAWYERS
 
     Bryan Cave LLP, St. Louis, Missouri, represented the Company in connection
with the rights offering. Cooley Godward LLP, Palo Alto, California, represented
the dealer managers in connection with the rights offering.
 
                                    EXPERTS
 
     KPMG LLP, independent auditors, audited our consolidated financial
statements and schedules as of December 31, 1998, 1997 and 1996 and for each of
the four years in the period ended December 31, 1998. We incorporate by
reference those financial statements in this prospectus with the permission of
KPMG and rely on KPMG's reports given upon their authority as experts in
accounting and auditing.
 
     KPMG San Tong Corp., independent auditors, audited PHC's financial
statements as of December 31, 1998, 1997 and 1996 and for the years then ended.
We incorporate by reference those financial statements in this prospectus with
the permission of KPMG San Tong Corp. and rely on their report given upon their
authority as experts in accounting and auditing.
 
     KPMG Certified Public Accountants, independent auditors, audited Taisil
Electronic Materials Corporation's financial statements as of and for the year
ended December 31, 1998 and 1997 and for the years then ended. We incorporate by
reference those financial statements in this prospectus with the permission of
KPMG Certified Public Accountants and rely on their report given upon their
authority as experts in accounting and auditing.
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     We have filed with the SEC a Registration Statement on Form S-3 under the
Securities Act of 1933 covering the shares of MEMC common stock to be issued in
the rights offering. As allowed by SEC rules, this prospectus does not contain
all of the information set forth in the registration statement. Our descriptions
in this prospectus concerning the contents of any contract, agreement or
documents are not necessarily complete. For those contracts, agreements or
documents that we filed as exhibits to the registration statement, you should
read the exhibit for a more complete understanding of the document or subject
matter involved.
 
     Because we are subject to the informational requirements of the Securities
Exchange Act of 1934, we file reports, proxy statements and other information
with the SEC. You may read and copy the registration statement, including the
attached exhibits and schedules, and any reports, proxy statements or other
information that we file
 
                                       55
<PAGE>   57
 
at the SEC's public reference room in
Washington, D.C. at 450 Fifth Street, N.W., 20549. You can request copies of
these documents by writing to the SEC and paying a duplicating charge. Please
call the SEC at 1-800-SEC-0330 for further information on the operation of its
public reference rooms in other cities. The SEC makes our filings available to
the public on its Internet site (http://www.sec.gov). In addition, you may
inspect such reports and other information at the offices of the New York Stock
Exchange, 20 Broad Street, New York, New York 10005.
 
   
     The SEC allows us to "incorporate by reference" information into this
prospectus, which means that we can disclose important information to you by
referring you to other documents that we filed separately with the SEC. You
should consider the incorporated information as if we reproduced it in this
prospectus, except for any information directly superseded by information
subsequently filed with the SEC and incorporated in this prospectus, or directly
contained in this prospectus.
    
 
     We incorporate by reference into this prospectus the following documents
(SEC File No. 1-13828), which contain important information about us and our
business and financial results:
 
     -  our Annual Report on Form 10-K for the fiscal year ended December 31,
        1997, as amended on
 
   
        -  Form 10-K/A filed on October 22, 1998,
    
 
   
        -  Form 10-K/A filed on December 10, 1998 and
    
 
   
        -  Form 10-K/A filed on March 2, 1999;
    
 
     -  our Quarterly Reports on Form 10-Q for the quarters ended
 
   
        -  March 31, 1998 as amended on Form 10-Q/A filed on March 2, 1999,
    
 
   
        -  June 30, 1998 as amended on Form 10-Q/A filed on March 2, 1999 and
    
 
   
        -  September 30, 1998 as amended on Form 10-Q/A filed on March 2, 1999;
    
 
     -  our Current Reports on Form 8-K dated
 
   
        -  April 14, 1998 (filed April 14, 1998),
    
 
   
        -  October 21, 1998 (filed October 22, 1998),
    
 
   
        -  October 22, 1998 (filed October 27, 1998),
    
 
   
        -  January 26, 1999 (filed January 28, 1999),
    
 
   
        -  February 17, 1999 (filed March 1, 1999),
    
 
   
        -  March 2, 1999 (filed March 2, 1999) (as amended on Form 8-K/A filed
           on March 16, 1999), which contains 1998 financial statements and
           related Management's Discussion and Analysis and
    
 
   
        -  March 2, 1999 (filed March 5, 1999); and
    
 
     -  the description of the MEMC common stock contained in our Registration
        Statement on Form 8-A filed with the SEC on June 21, 1995.
 
     We may file additional documents with the SEC pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act of 1934 on or after the date
of this prospectus and before the expiration of the rights offering. The SEC
allows us to incorporate by reference into this prospectus such documents. You
should consider any statement contained in this prospectus (or in a document
incorporated into this prospectus) to be modified or superseded to the extent
that a statement in a subsequently filed document modifies or supersedes such
statement.
 
     YOU MAY GET COPIES OF ANY OF THE INCORPORATED DOCUMENTS (EXCLUDING
EXHIBITS, UNLESS THE EXHIBITS ARE SPECIFICALLY INCORPORATED) AT NO CHARGE TO YOU
BY WRITING OR CALLING JANINE ORF, DIRECTOR, INVESTOR RELATIONS, MEMC ELECTRONIC
MATERIALS, INC., 501 PEARL DRIVE (CITY OF O'FALLON), ST. PETERS, MISSOURI 63376
(TELEPHONE: (314) 279-5500).
 
                                       56
<PAGE>   58
 
- ------------------------------------------------------
- ------------------------------------------------------
 
MEMC ELECTRONIC MATERIALS, INC. HAS NOT AUTHORIZED ANY PERSON TO GIVE YOU
INFORMATION THAT DIFFERS FROM THE INFORMATION IN THIS PROSPECTUS. YOU SHOULD
RELY SOLELY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. THIS PROSPECTUS IS
NOT AN OFFER TO SELL THESE SECURITIES, AND WE ARE NOT SOLICITING OFFERS TO BUY
THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE OF THESE SECURITIES IS NOT
PERMITTED. THE INFORMATION IN THIS PROSPECTUS IS ACCURATE ONLY AS OF THE DATE OF
THIS PROSPECTUS, EVEN IF THE PROSPECTUS IS DELIVERED TO YOU AFTER THE PROSPECTUS
DATE, OR YOU BUY MEMC COMMON STOCK AFTER THE PROSPECTUS DATE.
 
                      ------------------------------------
 
                               TABLE OF CONTENTS
                      ------------------------------------
 
<TABLE>
<CAPTION>
                                         Page
                                        -------
<S>                                     <C>
Questions & Answers About the Rights
  Offering.............................       2
Prospectus Summary.....................       4
Risk Factors...........................       8
Cautionary Statement Regarding Forward-
  Looking Statements...................      17
Recent Developments....................      19
Use of Proceeds........................      22
Dividend Policy........................      23
Price Range of Common Stock............      23
Capitalization.........................      24
The Rights Offering....................      25
Business...............................      35
Certain Relationships and Related Party
  Transactions.........................      45
Certain Federal Income Tax
  Considerations.......................      47
Description of Capital Stock...........      51
Plan of Distribution...................      54
Lawyers................................      55
Experts................................      55
Where You Can Find More Information....      55
</TABLE>
 
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
   
                               13,628,446 Shares
    
 
                      MEMC ELECTRONIC MATERIALS, INC. LOGO
 
                                MEMC Electronic
                                Materials, Inc.
                                  Common Stock
                      ------------------------------------
 
                                   PROSPECTUS
                      ------------------------------------
                             NationsBanc Montgomery
 
                                 Securities LLC
 
                               J.P. Morgan & Co.
 
   
                                 March 22, 1999
    
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   59
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the estimated expenses in connection with
the issuance and distribution of the securities offered hereby.
 
<TABLE>
<S>                                                           <C>
SEC Registration Fee........................................  $   26,105
NASD Filing Fee.............................................       9,900
NYSE Listing Fee............................................      75,000
Dealer Manager Fees and Expenses............................   1,970,000
Subscription Agent Fee......................................      20,000
Information Agent Fee.......................................      16,000
Printing and Engraving Expenses.............................     125,000
Legal Fees and Expenses.....................................     250,000
Accounting Fees and Expenses................................     250,000
Miscellaneous...............................................      45,000
                                                              ----------
  Total.....................................................  $2,787,005
                                                              ==========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 102(b)(7) of the Delaware General Corporation Law permits a
corporation to provide in its certificate of incorporation that a director of
the corporation shall not be personally liable to the corporation or its
stockholders for monetary damages for breach of fiduciary duty as a director,
except for liability (i) for any breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii) for
payments of unlawful dividends or unlawful stock repurchases or redemptions, or
(iv) for any transaction from which the director derived an improper personal
benefit. The Company's Restated Certificate of Incorporation contains such a
provision.
 
     Section 145 of the Delaware General Corporation Law provides that a
corporation may indemnify directors and officers as well as other employees and
individuals against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement in connection with specified actions, suits or
proceedings, whether civil, criminal, administrative or investigative (other
than an action by or in the right of the corporation -- a "derivative action"),
if they acted in good faith and in a manner they reasonably believed to be in 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 their conduct
was unlawful. A similar standard is applicable in the case of derivative
actions, except that indemnification only extends to expenses (including
attorneys' fees) incurred in connection with defense or settlement of such
action, and the statute requires court approval before there can be any
indemnification where the person seeking indemnification has been found liable
to the corporation. The Company's Restated Certificate of Incorporation contains
such a provision.
 
ITEM 16. EXHIBITS
 
     See Index to Exhibits.
 
                                      II-1
<PAGE>   60
 
ITEM 17. UNDERTAKINGS
 
(a)        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 percent 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 (a)(1)(i) and (a)(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.
 
          (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.
 
(b) 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 therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
(c) 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.
 
                                      II-2
<PAGE>   61
 
(d) 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.
 
                                      II-3
<PAGE>   62
 
                                   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 Amendment No. 4 to
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in St. Louis, Missouri, on March 19, 1999.
    
 
                                          MEMC ELECTRONIC MATERIALS, INC.
 
                                          By:      /s/ JAMES M. STOLZE
 
                                            ------------------------------------
                                              James M. Stolze
                                              Executive Vice President
                                              and Chief Financial Officer
 
   
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 4 to the Registration Statement has been signed by the following persons in
the capacities on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                     TITLE                           DATE
                  ---------                                     -----                           ----
<S>                                              <C>                                       <C>
*                                                President, Chief Executive Officer        March 19, 1999
- ---------------------------------------------    and Director (Principal Executive
Klaus R. von Horde                               Officer)
 
/s/ JAMES M. STOLZE                              Executive Vice President and Chief        March 19, 1999
- ---------------------------------------------    Financial Officer (Principal
James M. Stolze                                  Financial and Accounting Officer)
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Dr. Hans Michael Gaul
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Helmut Mamsch
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Willem D. Maris
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Paul T. O'Brien
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Dr. Alfred Oberholz
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Michael B. Smith
 
*                                                Director                                  March 19, 1999
- ---------------------------------------------
Ludger H. Viefhues
</TABLE>
    
 
*By: /s/ JAMES M. STOLZE
     ---------------------------------------------------------
     James M. Stolze, Attorney-In-Fact
 
                                      II-4
<PAGE>   63
 
                               INDEX TO EXHIBITS
 
   
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                             DESCRIPTION
- -------                            -----------
<S>        <C>
  *1.1     Form of Dealer Manager Agreement among MEMC and NationsBanc
           Montgomery Securities LLC and J.P. Morgan Securities Inc.
  *3.1     Restated Certificate of Incorporation of the Company
           (incorporated by reference to Exhibit 3-a of the Company's
           Form 10-Q for the quarter ended June 30, 1995 (File No.
           1-13828))
   3.2     Restated By-laws of the Company
  *4.1     Form of Rights Certificate to Subscribe for Shares of Common
           Stock of the Company
  *5.1     Opinion of Bryan Cave LLP
  *5.1(a)  Opinion of Richards, Layton & Finger, P.A.
  *8.1     Tax Opinion of Bryan Cave LLP
 *10.1     Purchase Agreement dated October 22, 1998 between the
           Company and VEBA Corporation (incorporated by reference to
           Exhibit 2 of the Schedule 13D dated October 30, 1998 filed
           by VEBA Aktiengesellschaft and VEBA Corporation with respect
           to the Company)
 *10.1(a)  First Amendment to Purchase Agreement
 *10.1(b)  Second Amendment to Purchase Agreement
 *10.2     Standby Agreement dated October 22, 1998 between the Company
           and VEBA Corporation (incorporated by reference to Exhibit 3
           of the Schedule 13D dated October 30, 1998 filed by VEBA
           Aktiengesellschaft and VEBA Corporation with respect to the
           Company)
 *10.3     Form of Amendment to Registration Rights Agreement by and
           between VEBA Corporation and MEMC
 *10.4     Revolving Credit Agreement by and between VEBA Corporation
           and MEMC dated February 26, 1999
  10.5     Employment Agreement between Klaus R. von Horde and MEMC
  10.6     Supplemental Retirement Agreement Clarification between
           Ludger H. Viefhues and MEMC
 *23.1     Consents of Bryan Cave LLP (included in Exhibits 5.1 and
           8.1)
  23.2     Consent of KPMG LLP
  23.3     Consent of KPMG San Tong Corp.
  23.4     Consent of KPMG Certified Public Accountants
 *23.5     Consent of Richards, Layton & Finger, P.A. (included in
           Exhibit 5.1(a))
 *24.1     Power of Attorney
 *99.1     Form of Instructions for Use of MEMC Rights Certificates
 *99.2     Form of Notice of Guaranteed Delivery for Subscription
           Rights
 *99.3     Form of DTC Participant Over-Subscription Exercise Form
 *99.4     Announcement of Rights Offering Distributed to Record and
           Beneficial Holders on December 7, 1998
 *99.5     Form of Letter to Stockholders Who Are Record Holders
 *99.6     Form of Letter to Stockholders Who Are Beneficial Holders
 *99.7     Form of Letter to Clients of Stockholders Who Are Beneficial
           Holders
 *99.8     Form of Nominee Holder Certification Form
 *99.9     Substitute Form W-9 for Use with the Rights Offering
 *99.10    Form of Beneficial Owner Election Form
 *99.11    Form of Subscription Agent Agreement by and between MEMC and
           Harris Trust and Savings Bank
 *99.12    Information Agent Agreement, dated December 7, 1998, by and
           between MEMC and Morrow & Co., Inc.
  99.13    Consent of NationsBanc Montgomery Securities LLC
</TABLE>
    
 
- ---------------
 * Previously filed.
 
                                      II-5

<PAGE>   1
                                                                     EXHIBIT 3.2


                                    BY-LAWS

                                       OF

                         MEMC ELECTRONIC MATERIALS, INC.

                        (Restated as of December 8, 1998)


                                    ARTICLE I

                                     Offices

     Section 1. Offices. The registered office of MEMC Electronic Materials,
Inc. (hereinafter called the Corporation) shall be in the State of Delaware. The
Corporation may have offices and places of business at such places within and
without the State of Delaware as shall be determined by the Board of Directors.
The books of the Corporation may be kept outside of the State of Delaware at
such place or places as the Board of Directors may from time to time determine.


                                   ARTICLE II

                                  Stockholders

     Section 1. Place of  Meetings.  All meetings of the  stockholders  shall be
held at such place within or without the State of Delaware as is  designated  by
the Board of Directors.

     Section 2. Annual Meeting. The Board of Directors shall fix the time and
place of the annual meeting of the stockholders for the purpose of electing the
directors and for the transaction of such other business as may properly be
brought before the meeting.

     Section 3. Special  Meeting.  Special  meetings of the  stockholders may be
called by a majority of the holders of the common stock of the Corporation or by
a majority of the Board of Directors or by the Chairman of the Board.

     Section 4. Notice of Meetings. Except as is otherwise provided by law,
notice of each meeting of stockholders, whether annual or special, shall be
given to each stockholder not less than 10 nor more than 60 days prior to the
meeting. The notice shall state the date, time and place and, in the case of
special meetings, the purpose or purposes of such meeting, and at whose
direction the notice is given.

     Section 5. Quorum. At all meetings of stockholders, except as otherwise
required by statute, the holders of a majority of the shares entitled to vote
thereat, present in person or by proxy, shall constitute a quorum for the
transaction of business. If, however, such quorum shall not be present or
represented at any meeting of the stockholders, the stockholders entitled to
vote thereat may adjourn such meeting from time to time in accordance with
Section 7 of this Article II of these By-Laws until the number of votes
requisite to constitute a quorum shall be present.

     Section 6. Voting. When a quorum is present or represented by proxy at any
meeting of stockholders, the vote of the holders of a majority of the
outstanding shares of stock entitled to vote thereat present in person or by
proxy shall decide any question brought before such meeting, unless the question
is one upon which an express provision of the General Corporation Law of the
State of Delaware or of the Restated Certificate of Incorporation requires a
greater vote, in which case such provision shall control.

     Each stockholder entitled to vote at any meeting may vote in person or by
proxy and shall, unless the Restated Certificate of Incorporation provides
otherwise, have one vote for each share of stock registered in his name, but no
proxy shall be valid after three years from its date, unless the proxy provides
for a longer period.

     Section 7. Adjourned Meetings. Any meeting of stockholders may be adjourned
to a designated time and place by a vote of a majority in interest of the
stockholders present in person or by proxy, even though less than a quorum is so
present. No notice of such an adjourned meeting needs to be given, other than by
announcement at the meeting, and any business may be transacted which might have
been transacted at the meeting as originally called; provided, however, that if
the adjournment is for more than 30 days, or if after the adjournment a new
record date is fixed for the adjourned meeting, a notice of the adjourned
meeting shall be given to each stockholder of record entitled to vote at the
adjourned meeting.

     Section 8. Action Without Meeting. Any action required or permitted to be
taken at any annual or special meeting of stockholders may be taken without a
meeting, without prior notice and without a vote, if a consent or consents in
writing, setting forth the action so taken, shall be signed by the holders of
all the outstanding stock entitled to vote thereon. The effective date of the
authorization of such action shall be deemed to be the date of the filing of the
last such written consent in the minute books of the Corporation, which date
shall be noted therein by the Secretary.

     Section 9. Advance Notice of Business to Be Transacted at Annual Meetings.



<PAGE>   2

To be properly brought before the annual meeting of stockholders, business must
be either (a) specified in the notice of meeting (or any supplement thereto)
given by or at the direction of the Board of Directors (or any duly authorized
committee thereof), (b) otherwise properly brought before the meeting by or at
the direction of the Board of Directors (or any duly authorized committee
thereof) or (c) otherwise properly brought before the meeting by any stockholder
of the Corporation (i) who is a stockholder of record on the date of the giving
of the notice provided for in this Section 9 and on the record date for the
determination of stockholders entitled to vote at such meeting and (ii) who
complies with the notice procedures set forth in this Section 9. In addition to
any other applicable requirements, including but not limited to the requirements
of Rule 14a-8 promulgated by the Securities and Exchange Commission under the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), for business
to be properly brought before an annual meeting by a stockholder, such
stockholder must have given timely notice thereof in proper written form to the
Secretary of the Corporation.

     To be timely, a stockholder's notice to the Secretary must be delivered to
or mailed and received at the principal executive offices of the Corporation,
not less than 60 days nor more than 90 days prior to the anniversary date of the
immediately preceding annual meeting of stockholders; provided, however, that in
the event that the annual meeting is called for a date that is not within 30
days before or after such anniversary date, in order to be timely, notice by the
stockholder must be so received not later than the close of business on the
tenth day following the day on which notice of the date of the annual meeting is
mailed to stockholders or public disclosure of the date of the annual meeting is
made, whichever first occurs.

     To be in proper written form, a stockholder's notice to the Secretary must
set forth as to each matter such stockholder proposes to bring before the annual
meeting (a) a brief description of the business desired to be brought before the
meeting and the reasons for conducting such business at the meeting, (b) the
name and record address of such stockholder, (c) the class or series and number
of shares of capital stock of the Corporation which are owned beneficially or of
record by such stockholder, together with evidence reasonably satisfactory to
the Secretary of such beneficial ownership, (d) a description of all
arrangements or understandings between such stockholder and any other person or
persons (including their names) in connection with the proposal of such business
by such stockholder and any material interest of such stockholder in such
business and (e) a representation that such stockholder intends to appear in
person or by proxy at the annual meeting to bring such business before the
meeting.

     Notwithstanding anything in these By-Laws to the contrary, no business
shall be conducted at the annual meeting of stockholders except business brought
before such meeting in accordance with the procedures set forth in this Section
9; provided, however, that, once business has been properly brought before such
meeting in accordance with such procedures, nothing in this Section 9 shall be
deemed to preclude discussion by any stockholder of any such business. If the
chairman of such meeting determines that business was not properly brought
before the meeting in accordance with the foregoing procedures, the chairman
shall declare to the meeting that the business was not properly brought before
the meeting and such business shall not be transacted.


                                   ARTICLE III

                                    Directors

     Section 1. Management of the Corporation. The business and affairs of the
Corporation shall be managed by or under the direction of the Board of
Directors. The officers of the Corporation shall keep the Board of Directors
fully informed about the affairs of the Corporation, and the officers and
employees of the Corporation shall provide the Board of Directors with such
written or oral reports and information as the Board of Directors may deem
advisable.

     Section 2. Number and Term of Office. Subject to the rights, if any, of
holders of preferred stock of the Corporation, the number of directors shall be
determined from time to time by resolution passed by a majority of the Board of
Directors of the Corporation, but in no event shall the Board of Directors
consist of less than five or more than 15 directors. The number of directors so
determined is referred to in these By-Laws as the "total number of directors".
The Board of Directors shall, by resolution passed by a majority of the Board of
Directors, designate the directors to serve as initial Class I, Class II and
Class III directors upon filing of the Restated Certificate of Incorporation of
the Corporation with the Secretary of State of the State of Delaware. Except as
provided in Section 5 of this Article III, directors shall be elected by a
plurality of the votes cast at annual meetings of stockholders, and each
director so elected shall hold office as provided by Article Fifth of the
Restated Certificate of Incorporation of the Corporation. Directors need not be
stockholders of the Corporation.

     Section 3. Nomination of Directors and Advance Notice Thereof. Only persons
who are nominated in accordance with the Restated Certificate of Incorporation
of the Corporation shall be eligible for election as directors of the
Corporation.

     Section 4. Resignation. Any director may resign at any time. Such

<PAGE>   3



resignation shall be made in writing and shall take effect at the time specified
therein or, if no time be specified, at the time of its receipt by the Chief
Executive Officer (the "CEO"), the President or the Secretary of the
Corporation. The acceptance of a resignation shall not be necessary to make it
effective.

     Section 5. Vacancies. Subject to the rights, if any, of the holders of any
series of preferred stock then outstanding, any vacancy on the Board of
Directors arising from death, resignation, removal, an increase in the number of
directors or any other cause, may be filled either by a majority vote of the
remaining directors, although less than a quorum, or by the sole remaining
director; provided, however, that if any director then in office determines that
any such vacancy on the Board of Directors shall be filled by the stockholders,
such vacancy shall be filled by the stockholders in accordance with the Restated
Certificate of Incorporation. Any director elected to fill a vacancy shall hold
office for a term that shall coincide with the term of the class to which such
director shall have been elected.

     Section 6. Regular Meetings. The Board of Directors shall hold at least two
regular meetings during each calendar year on such dates as may be determined by
the Board of Directors. Such regular meetings may be held at such places, either
within or without the State of Delaware, as shall from time to time be
determined by the Board of Directors.

     Section 7. Special Meetings. Special meetings of the Board of Directors may
be called by the Chairman of the Board, the CEO or the President, and shall be
called by the CEO, the President or the Secretary, upon the written request of
at least two members of the Board of Directors. Each director shall be given 10
days' notice of each such meeting.

     Section 8. Fees. Each member of the Board of Directors who is not an
officer of the Corporation shall receive from the Corporation an annual fee for
serving on the Board of Directors and an annual fee for serving on each
committee of the Board of Directors on which such director serves, plus a fee
for each meeting of the Board of Directors he attends, plus a fee for each
meeting of a committee of the Board of Directors he attends. The amount of such
fees shall be determined from time to time by a majority of the total number of
directors. Each director, including those who are also officers, shall receive
from the Corporation reimbursement of travel expenses for each meeting of the
Board of Directors or any committee thereof he attends.

     Section 9. Quorum.  A quorum of directors for the  transaction  of business
shall consist of at least a majority of the total number of directors.

     Section 10. Waiver of Notice. Notice of a meeting need not be given to any
director who submits a written waiver of such notice, signed by him, whether
before or after such meeting. Neither the business to be transacted at, nor the
purpose of, any meeting of the directors need be specified in any written waiver
of notice with respect to such meeting. Attendance of a director at a meeting
shall constitute a waiver of notice of such meeting, except when the director
attends such meeting for the express purpose of objecting, at the beginning of
such meeting, to the transaction of any business because the meeting is not
lawfully called or convened.

     Section 11. Voting.  The act of a majority of the total number of directors
shall be the act of the Board of Directors.

     Section 12. Meetings via Conference Call. Any one or more members of the
Board of Directors or any committee thereof may participate in a meeting of the
Board of Directors or such committee by means of a conference telephone call or
similar communications equipment hook-up allowing all persons participating in
the meeting to hear each other at the same time. Participation by such means
shall constitute presence in person at a meeting.

     Section 13. Action Without Meeting. Notwithstanding any other provisions of
these By-Laws, any action required or permitted to be taken at any meeting of
the Board of Directors or any committee thereof may be taken without a meeting,
if a written consent or consents to the adoption of a resolution authorizing the
action is signed by the whole Board of the Corporation or all the members of
such committee, as the case may be. The resolution and the written consents
thereto shall be filed with the minutes of the proceedings of the Board of
Directors.

     Section 14. Committees. (a) Audit Committee; Compensation Committee; Other
Committees. The Board of Directors shall designate an Audit Committee and a
Compensation Committee, each consisting of at least two directors and to have
such duties and functions as shall be specified in the resolution or resolutions
appointing such committees. The Board of Directors, by resolution passed by a
majority of the total number of directors, may designate other committees of the
Board of Directors, each such committee to consist of two or more directors and
to have such duties and functions as shall be provided in such resolution.

     (b) Rules of Committees. A majority of all of the members of any committee
of the Board of Directors may determine its rules of procedure, determine its
action and fix the time and place, whether within or without the State of
Delaware, of its meetings and specify what notice thereof, if any, shall be
given, unless the Board of Directors shall otherwise by resolution provide. Each
committee shall record minutes of its proceedings and shall submit the same to
the Board of Directors. The Board of Directors shall have power to change the



<PAGE>   4

members of any such committee and fill vacancies therein and to discharge any
such committee, either with or without cause, at any time.

     (c) Powers of Committees. The Board of Directors, by resolution passed by a
majority of a duly constituted quorum of the Board of Directors, may designate
committees of the Board of Directors pursuant to, and which will have the powers
as are consistent with, the provisions of Section 141(c)(2) of the Delaware
General Corporation Law.

     Section 15. The Chairman of the Board and Vice Chairman of the Board. The
Chairman of the Board and, if the Board of Directors determines that the Board
should have a Vice Chairman, the Vice Chairman of the Board shall be elected
annually by the Board of Directors. The Chairman of the Board shall preside at
all meetings of the Board of Directors, act as chairman at all meetings of
stockholders and shall sign the minutes of the proceedings recorded at such
meetings by the Secretary. He shall make reports to the Board of Directors as
well as to the stockholders and shall perform all duties incident to his office
or properly required of him by the Board of Directors. The Chairman of the Board
and the Vice Chairman of the Board shall each perform such further duties and
exercise such further powers as may be assigned to him from time to time by the
Board of Directors. In the absence of the Chairman of the Board, the Vice
Chairman of the Board shall carry out his duties and authorities.


                                   ARTICLE IV

                                    Officers

     Section 1. Officers. The officers of the Corporation shall include the
Chief Executive Officer, the President, a Treasurer and a Secretary. Each
officer of the Corporation shall hold office until his successor shall have been
duly chosen and qualified, or until his death, disqualification, resignation or
removal. Except for the offices of President and Secretary, any two or more
offices may be held by one person. Any vacancy occurring in any office shall be
filled by the Board of Directors.

     Section 2. Other Officers. The Board of Directors may appoint one or more
Vice Presidents, Assistant Treasurers, Assistant Secretaries and such other
officers and agents with such powers and duties as it shall deem necessary.

     Section 3. The Chief Executive Officer (the "CEO"). The Chief Executive
Officer, subject to the direction of the Board of Directors, shall have general
management and control of the business and affairs of the Corporation.

     Section 4. The President. The President shall be the Chief Operating
Officer of the Corporation and, subject to the direction of the CEO and the
Board of Directors, shall be responsible for the day-to-day management of the
Corporation.

     Section 5. The Treasurer. The Treasurer shall have custody of all funds,
securities and evidences of indebtedness of the Corporation, shall receive and
give receipts and acquittances for monies paid in on account of the Corporation,
shall pay out of the funds on hand all bills, payrolls, and other just debts of
the Corporation, of whatever nature upon maturity, shall enter regularly in
books to be kept by him for that purpose, full and accurate accounts of all
monies received and paid out by him on account of the Corporation, and shall
perform all other duties incident to the Office of Treasurer and as may be
prescribed by the Board of Directors.

     Section 6. The Secretary. The Secretary, if he shall be present, shall keep
the minutes of all proceedings of directors and stockholders, and shall attend
to the giving and serving of all notices to stockholders and directors or other
notices required by law or by these By-Laws, shall affix the seal of the
Corporation to deeds, contracts and other instruments in writing requiring a
seal when duly signed or when so ordered by the Board of Directors, shall have
charge of the minute books, certificate books and stock books and such other
books and papers as the Board of Directors may direct, and shall perform all
other duties incident to the office of Secretary.

     Section 7. Removal of Officers. Any officer of the Corporation may be
removed from office at any time, with or without cause, by a vote of the
majority of the total number of directors.


                                    ARTICLE V

                                  Capital Stock

     Section 1. Form and Execution of Certificates. The shares of the
Corporation shall be represented by certificates in such form as is required by
the General Corporation Law of the State of Delaware and as shall be adopted by
the Board of Directors. Certificates shall be numbered and registered in the
order issued, shall be signed by the President or a Vice President and by the
Secretary or the Treasurer and sealed with the corporate seal or a facsimile
thereof.

     Section 2. Transfer. Transfer of shares shall be made only upon the books
of the Corporation by the registered holder thereof or by attorney, duly
authorized, and upon surrender of the certificate or certificates for such



<PAGE>   5

shares properly assigned for transfer.

     Section 3. Lost or Destroyed Certificates. The holder of any certificate
representing shares of stock of the Corporation may notify the Corporation of
any loss, theft, or destruction thereof, and the Board of Directors may
thereupon, in its discretion (subject to applicable law), cause a new
certificate for the same number of shares to be issued to such holder upon
satisfactory proof of such loss, theft or destruction, and, if required by the
Board of Directors, the deposit of indemnity by way of bond or otherwise, in
such form and amount and with such surety or sureties as the Board of Directors
may require, to indemnify the Corporation against loss or liability by reason of
the issuance of such new certificates.

     Section 4. Record Date. The Board of Directors may fix, in advance, a date,
not exceeding 60 days nor less than 10 days, as the record date for the
determination of stockholders entitled to receive notice of, or to vote at, any
meeting of stockholders, or to consent to any proposal without a meeting, or for
the purpose of determining stockholders entitled to receive payment of any
dividends, or allotment of any rights, or for the purpose of any other action.


                                   ARTICLE VI

                                  Miscellaneous

     Section 1. Dividends and Reserves. The Board of Directors may declare
dividends and may set apart out of any of the funds of the Corporation available
for dividends a reserve or reserves for any proper purpose and may reduce or
eliminate any such reserve. Dividends may be paid in cash, in property, or in
shares of stock.

     Section  2.  Regulations.  The Board of  Directors  may make such rules and
regulations as it may deem expedient concerning the transfer and registration of
certificates for shares of the Corporation.

     Section 3. Corporate Seal. The corporate seal shall have inscribed  thereon
the name of the Corporation and the words "CORPORATE SEAL", and the state of its
incorporation.

     Section 4. Notice and Waiver of Notice. Whenever under the provisions of
these By-Laws any notice is required to be given, such notice, unless otherwise
required by law or by these By-Laws, shall be communicated to the person
entitled thereto be courier mail or first-class mail, postage prepaid, or by
telegraph, telex, cable, facsimile or other recorded form of transmission, and
such notice shall be deemed to have been given on the third day after the time
of dispatch by courier mail or mailing thereof or at the time of dispatch in the
case of notice by any other form of transmission. Any notice required to be
given under these By-Laws may be waived in writing by the person entitled
thereto, whether before or after the time stated therein.

     Section  5.  Fiscal  Year.  The  fiscal  year of the  Corporation  shall be
determined by resolution of the Board of Directors.


                                   ARTICLE VII

                                   Amendments

     Section 1. Amendments. The Board of Directors shall have the power, without
assent or vote of the stockholders, to make, alter, amend, change, add to or
repeal these By-Laws, or any of them, upon a vote of a majority of the total
number of directors.

<PAGE>   1
                                                                    EXHIBIT 10.5


                              EMPLOYMENT AGREEMENT


     The following  sets out the  agreement  between Klaus R. von Horde and MEMC
Electronic  Materials,  Inc. ("MEMC")  regarding the employment of Mr. von Horde
with MEMC:

     1. EMPLOYMENT TERM. Mr. von Horde will be employed by MEMC as President and
Chief Executive Officer for the period  commencing  February 17, 1999 and ending
March 31, 2003.

     2.  REPORTING  RESPONSIBILITY.  Mr. von Horde will  report  directly to the
Chairman of the Board of Directors.  During the employment period, Mr. von Horde
will  devote  his full  business  time to his  duties  as  President  and  Chief
Executive Officer of MEMC.

     3. BASE SALARY. Mr. von Horde's base salary will be $520,000 per annum,
which may be increased, but not decreased, at the discretion of the Compensation
Committee of the Board of Directors of MEMC (the "Compensation Committee") based
upon performance and upon the Compensation Committee's review of the appropriate
base salary for the positions and responsibilities assigned to Mr. von Horde
from time to time. The Compensation Committee will review Mr. von Horde's base
salary annually. Compensation of the Chief Executive Officer is primarily a
function of company performance and individual performance and could, in any
given year, be higher or lower than that of other chief executive officers in
comparable positions. But it is the intent that MEMC's compensation opportunity
be structured to afford comparable pay given comparable performance.

     4. ANNUAL BONUS. Mr. von Horde will be eligible to receive an annual bonus
with a target at no less than 50% of his annual base salary as of December 31st
of the year for which the bonus is paid. The bonus will be payable to Mr. von
Horde only upon achievement of 


<PAGE>   2

performance objectives set by the Compensation Committee, and the payment of any
bonus will be at the Compensation Committee's sole discretion. The bonus will be
paid under the Annual Incentive Plan under the same performance objectives and
terms applicable to other executive employees.

     5. STOCK OPTIONS. In accordance with the MEMC Equity Incentive Plan, Mr.
von Horde will be awarded stock options annually. In January, 2000, 2001, and
2002, each year's grant will be comprised of options to purchase a number of
shares with a face value of no less than 200% of Mr. von Horde's salary (as of
December 31st of the year prior to the grant), which options will have an
exercise price per share equal to 100% of market value on the date of the grant.
The maximum number of shares in any one year will be 100,000. The options will
vest at the rate of 25% per year starting one year after the grant such that
100% vesting will occur on the fourth anniversary of the grant; provided,
however, that all options will vest upon Mr. von Horde's retirement on or
following March 31, 2003, or earlier, with the consent of the Compensation
Committee. The options shall in other respects be subject to the same terms
applicable to options granted to other senior executives.

     6.  BENEFITS.  Mr. von Horde will  participate  in all  welfare  and fringe
benefit plans  maintained by MEMC for its senior  executives in accordance  with
their terms.

     7. PENSION. Mr. von Horde will participate in the MEMC Pension Plan as well
as the MEMC Supplemental Executive Pension Plan (SEPP) in accordance with their
terms, based on an employment date with MEMC of December 1, 1997.

     8. TERMINATION OF EMPLOYMENT. Either party may terminate Mr. von Horde's
employment under this Agreement upon twelve (12) months' prior notice, delivered
in writing. In the event Mr. von Horde is involuntary terminated (other than
"Termination for Cause," death, 

                                      -2-
<PAGE>   3

total and permanent disability, or retirement at the end of the agreement term)
or if Mr. von Horde resigns for "Good Reason" during the term of this agreement:

          (a) Mr. von Horde will continue to receive full salary, benefits and
     pension credit through the notice period, the end of which will be the date
     of termination of employment;

          (b) MEMC will pay Mr. von Horde a pro rata bonus for the year of
     termination based on the number of days in such year before the date of
     termination of employment (to be paid at the same time and to the same
     extent, i.e., based on MEMC's performance for the full year, that bonuses
     are paid generally to executives with respect to each year);

          (c) Mr. von Horde will be reimbursed for all reasonable relocation
     expenses incurred by him in returning to Germany with his family within a
     year of his termination date; and

          (d) All stock options granted to Mr. von Horde will vest and remain
     outstanding and exercisable for three (3) years following his termination
     date, unless the options are exercised or expire sooner by their terms.

          No payment will be made to Mr. von Horde at his termination for unused
     vacation.

     9. SUPPLEMENTAL TERMINATION BENEFITS. If Mr. von Horde receives termination
benefits  (a) through (d) in  paragraph 8 above,  then he also will  receive the
following  supplemental  termination  benefits  effective as of his  termination
date:

          (a) A lump sum cash payment equal to six (6) months' salary;

          (b) Continued coverage in the medical and dental benefit plan for six
     (6) months (but not beyond March 31, 2003 or his return to Germany);

          (c) Pension service credit through the end of the agreement term for
     benefit accrual purposes; and

                                      -3-
<PAGE>   4


          (d) Accelerated pension vesting and waiver of early retirement
     reduction factors such that a full unreduced normal retirement pension
     amount (including SEPP) is available six (6) months after his termination
     date (or March 31, 2003, if sooner), based on five (5) years of service.

     In exchange for these supplemental termination benefits, Mr. von Horde
agrees to release MEMC from liability and resign from the Board of Directors as
of the termination date, or sooner if requested by the Chairman.

     10. SUPPLEMENTAL PENSION AND MEDICAL BENEFITS. In the event Mr. von Horde
voluntarily retires on or after March 31, 2003, his pension shall be fully
vested and the early retirement reduction factors shall be waived, such that a
full unreduced normal retirement pension amount (including SEPP) is available on
his retirement date; and he shall be entitled to continued coverage in the
medical and dental benefit plan for twelve (12) months (but not beyond his
return to Germany).

     11. METHOD OF PROVIDING BENEFITS. The portion of any pension benefit
provided pursuant to this agreement that cannot be provided by the MEMC Pension
Plan (a qualified plan subject to the requirements of Section 401 of the
Internal Revenue Code) in accordance with its terms shall be provided through
the SEPP regardless of any provision in the SEPP document. In the event
providing the continued medical and dental coverage prescribed above would, in
the opinion of tax counsel to MEMC, jeopardize the favorable federal income tax
treatment of the medical or dental benefits provided to other employees of MEMC,
MEMC shall pay Mr. von Horde an amount in cash equal to the cost to Mr. von
Horde of paying for COBRA continuation coverage during the period to which he is
entitled to coverage pursuant to this agreement (the "COBRA premium
reimbursement"), plus an amount in cash (the "tax gross-up amount") so that


                                      -4-
<PAGE>   5

the net amount after payment of the federal and state income tax imposed on the
COBRA premium reimbursement and the tax gross-up amount shall equal the COBRA
premium reimbursement.

     12. DEFINITIONS. For purposes of this Agreement, the following terms will
have the following meanings:

          (a) Termination for Cause.  The involuntary  termination of employment
     of Mr. von Horde by MEMC because of:

               (i)   dishonesty  of Mr.  von Horde  that  results  in a material
          detriment to MEMC;

               (ii)  the intentional subversion of MEMC's best interests; or

               (iii) insubordination of Mr. von Horde with respect to a
          resolution or resolutions of the Board of Directors of MEMC.

          (b) Resignation for "Good Reason". Written notice by Mr. von Horde
     that he is resigning based upon:

               (i)   Reduction in position, title, reporting relationship or
          major responsibilities without his consent;

               (ii)  Violation by MEMC of the terms of this Agreement; or

               (iii) Failure of any successor to MEMC to honor this Agreement.

          Upon receipt of such written notice, MEMC will have thirty (30) days
     to respond in writing and correct the deficiency. If resignation for Good
     Reason is effective, the notice required by paragraph 8 herein starts with
     Mr. von Horde's first written notice.

     13. ARBITRATION. Any disputes between the parties to this Agreement shall
be settled by arbitration in St. Louis, Missouri under the auspices of the
American Arbitration Association in 

                                      -5-
<PAGE>   6

accordance with the National Rules for the Resolution of Employment Disputes
promulgated by the Association. The decision in such arbitration shall be final
and conclusive on the parties and judgment upon such decision may be entered in
any court having jurisdiction thereof.

     14. CONFIDENTIALITY   AGREEMENT.   MEMC's  Confidentiality   Agreement  is
incorporated   by  reference  in  this  Agreement  and  has  been  executed  and
acknowledged by Mr. von Horde.

     15. MISCELLANEOUS. This Agreement shall be construed in accordance with and
be governed by the laws of the State of Missouri applicable to contracts
executed and to be performed within such state. It also represents the entire
agreement of the parties regarding its subject matter and supersedes any prior
or contemporaneous agreements or understandings, whether written or oral.

                                         MEMC ELECTRONIC MATERIALS, INC.


                                         By:/s/ Helmut Mamsch
                                            ------------------------------------
                                            Helmut Mamsch, Chairman of the Board

                                            Date:  March 11, 1999
                                                   -----------------------------



                                            /s/ Klaus R. von Horde
                                            ------------------------------------
                                             Klaus R. von Horde

                                            Date:  3/11/99
                                                   -----------------------------

                                      -6-

<PAGE>   1
                                                                    EXHIBIT 10.6



                        SUPPLEMENTAL RETIREMENT AGREEMENT
                                  CLARIFICATION


     MEMC  Electronic  Materials,  Inc.  ("MEMC")  and Ludger H.  Viefhues  (the
"Executive") entered into a Supplemental Retirement Agreement dated February 17,
1999 (the "Retirement Agreement").

     It has subsequently been determined that the Retirement Agreement may not
accurately reflect the intent of the parties in all respects; and that the
method of delivery of the benefits provided in the Retirement Agreement may be
inconsistent in some respects with the requirements applicable to the MEMC
Pension Plan and the MEMC welfare plans.

     The parties now wish to amend the Retirement Agreement to correct a
mathematical error regarding the pro rata annual incentive payment and to
conform the technical method of delivery of the benefits to conform to the
requirements governing the MEMC Pension Plan and the MEMC welfare plans.

     NOW, THEREFORE, the Retirement Agreement is hereby modified as follows:

     1. The pro rata annual incentive payment provided for in Section 3.1 of the
Retirement Agreement shall be calculated by multiplying the full 1999 bonus by
0.624658 (instead of 0.71237) to accurately reflect the actual number of days in
1999 through the end of the Transition Term.

     2. Section 4.2 of the Retirement Agreement is hereby amended to read in its
entirety as follows:

        4.2. Pension Credit. As of the Transition Date, the Executive shall
     receive an additional year of credit for service under the MEMC SEPP. The
     Executive's accrued benefit under the SEPP shall be payable as soon as
     practical after August 18, 2000, and shall be based on service credit
     including such 



<PAGE>   2

     additional year and on Average Total Earnings determined as
     of August 17, 1999. MEMC acknowledges that, as of the Transition Date, the
     combination of the Executive's age and years of service is at least 80, and
     therefore, the Executive will be eligible for the "Combo 80" early
     retirement income benefits under the MEMC Pension Plan in accordance with
     its terms.

     3. Section 4.5 of the Retirement Agreement is hereby amended to read in its
entirety as follows:

          4.5. Other Employee Benefit and Perquisites. Effective as of the
     Transition Date, the Executive shall continue to participate in the Retiree
     Medical Plan of MEMC in accordance with its terms. MEMC acknowledges that
     as of the Transition Date, the Executive will be eligible for coverage
     under the Retiree Medical Plan. In addition, MEMC shall pay the Executive
     an amount in cash equal to the cost to the Executive of paying for COBRA
     continuation coverage for dental benefits (the "COBRA Premium
     Reimbursement"). MEMC acknowledges that the Executive will be eligible for
     retiree life insurance benefits under its Retiree Life Insurance Plan,
     which presently provides benefits equal to 25% of the coverage applicable
     to active employees. In addition, MEMC shall provide the Executive with a
     term life insurance policy for one million dollars ($1,000,000.00) of
     coverage effective for the one year period beginning on the Transition
     Date. MEMC shall also pay the Executive an amount in cash (the "Tax
     Gross-Up Amount") so that the net amount after payment of the federal and
     state income tax imposed on the COBRA Premium Reimbursement, the cost of
     the additional term life insurance policy, and the Tax Gross-Up Amount
     shall equal the COBRA Premium Reimbursement and the cost of the additional
     term life insurance policy. In addition, MEMC agrees that it will provide
     the Executive with reasonable and customary tax preparation services and
     financial planning assistance for the 1999 tax year.

     The parties to this Agreement hereby acknowledge that the Retirement
Agreement, as modified and clarified by this Agreement, reflects and implements
the agreement regarding supplemental retirement benefits between Executive and
the Board of Directors of MEMC.

                                      -2-
<PAGE>   3


     IN WITNESS WHEREOF, the parties hereto have executed this Agreement this
17th day of March, 1999.

                                                MEMC ELECTRONIC MATERIALS, INC.



                                                By:/s/ James W. Wick
                                                   -----------------------------
                                                   James W. Wick
                                                   Corporate Vice President,
                                                   Human Resources



                                                /s/ Ludger H. Viefhues
                                                --------------------------------
                                                Ludger H. Viefhues
                                      -3-

<PAGE>   1
                                                                    Exhibit 23.2



                         Independent Auditors' Consent

The Board of Directors
MEMC Electronic Materials, Inc.:

We consent to incorporation by reference in Amendment No. 4 to the registration
statement on Form S-3 of MEMC Electronic Materials, Inc. of: our report dated
January 25, 1999, relating to the consolidated balance sheets of MEMC Electronic
Materials, Inc. and subsidiaries as of December 31, 1998 and 1997, and the
related consolidated statements of operations, stockholders' equity, and cash
flows for each of the years in the three-year period ended December 31, 1998,
and the related schedule, which report appears in the Form 8-K/A dated March 16,
1999 of MEMC Electronic Materials, Inc.; our report dated January 26, 1998,
relating to the consolidated balance sheets of MEMC Electronic Materials, Inc.
and subsidiaries as of December 31, 1997 and 1996, and the related consolidated
statements of operations, stockholders' equity, and cash flows for each of the
years in the three-year period ended December 31, 1997, and the related
schedule, which report appears in the Form 10-K/A Amendment No. 3 of MEMC
Electronic Materials, Inc.; and to the reference to our firm under the heading
"Experts" in the registration statement.

                                             /s/ KPMG LLP

St. Louis, Missouri
March 19, 1999


<PAGE>   1
                                                                    Exhibit 23.3


                         Independent Auditors' Consent

The Stockholders and Board of Directors
POSCO HULS Co., Ltd.:

We consent to incorporation by reference in Amendment No. 4 to the registration
statement on Form S-3 of MEMC Electronic Materials, Inc. of: our report dated
January 11, 1999, relating to the balance sheets of POSCO HULS Co., Ltd. as of
December 31, 1998 and 1997, and related statements of operations, appropriation
(disposition) of retained earnings (deficit), and cash flows for each of the
years in the three-year period ended December 31, 1998, which report is included
in the Form 8-K/A dated March 16, 1999 of MEMC Electronic Materials, Inc.; our
report dated January 10, 1998, except as to note 18 which is as of February 9,
1999, relating to the balance sheets of POSCO HULS Co., Ltd. as of December 31,
1997 and 1996, and the related statements of earnings, appropriation
(disposition) of retained earnings (deficit) and cash flows for the year ended
December 31, 1997 and 1996, which report is included in the Form 10-K/A
Amendment No. 3 of MEMC Electronic Materials, Inc.; and to the reference to our
firm under the heading "Experts" in the registration statement.

                                             /s/ KPMG San Tong Corp.

Seoul, Korea
March 19, 1999



<PAGE>   1
                                                                    Exhibit 23.4




                         INDEPENDENT AUDITORS' CONSENT


The Board of Directors
Taisil Electronic Materials Corporation:

We consent to incorporation by reference in Amendment No. 4 to the registration
statement on Form S-3 of MEMC Electronic Materials, Inc. of our report dated
February 9, 1999, relating to the balance sheets of Taisil Electronic Materials
Corporation as of December 31, 1998 and 1997, and the related statements of
operations, changes in stockholders' equity, and cash flows for each of the
years ended December 31, 1998 and 1997, which report is included in the Form 8-K
dated March 2, 1999 of MEMC Electronic Materials, Inc. and to the reference to
our firm under the heading "Experts" in the registration statement.


                                        /s/ KPMG Certified Public Accountants

Taipei, Taiwan
March 19, 1999



<PAGE>   1
                                                                   Exhibit 99.13



                CONSENT OF NATIONSBANC MONTGOMERY SECURITIES LLC

         We hereby consent to the inclusion of our name in Amendment No. 4 to
the Registration Statement on Form S-3 relating to the proposed rights offering
of MEMC Electronic Materials, Inc., a Delaware corporation, and to the
references to our analyses performed for the Special Committee of the Board of
Directors of MEMC Electronic Materials, Inc. in the Registration Statement under
the captions "The Rights Offering -- Determination of Subscription Price" and
"Plan of Distribution." In giving such consent, we do not admit that we come
within the category of persons whose consent is required under Section 7 of the
Securities Act of 1933, as amended, or the rules and regulations issued by the
Securities and Exchange Commission thereunder (collectively, the "Securities
Act") nor do we admit that we are experts with respect to any part of such
Registration Statement within the meaning of the term "expert" as used in the
Securities Act.



                                  NATIONSBANC MONTGOMERY SECURITIES LLC



                                  By: /s/ Rex Sherry                    
                                     ----------------------------------
                                  Rex Sherry
                                  Senior Managing Director



March 19, 1999





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