UNOCAL CORP
424B3, 1995-11-13
PETROLEUM REFINING
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                                                FILED PURSUANT TO RULE 424(b)(3)
                                                      REGISTRATION NOS. 33-63719
                                                                    AND 33-50555

                                  PROSPECTUS
 
                              [LOGO OF UNOCAL 76]
 
                              UNOCAL CORPORATION
 
             DIVIDEND REINVESTMENT AND COMMON STOCK PURCHASE PLAN
 
  Unocal Corporation's ("Unocal") Dividend Reinvestment and Common Stock
Purchase Plan (the "Plan") provides an owner of 25 or more shares of Unocal's
Common Stock, $1.00 par value per share ("Common Stock"), or $3.50 Convertible
Preferred Stock, par value $.10 per share ("Preferred Stock"), with a
convenient and economical method of using cash dividends paid on these shares
to purchase shares of Common Stock at 97% of the market price. See Question
13. An owner may also make optional cash deposits to purchase shares of Common
Stock at the market price without benefit of a discount. See Question 15. The
Plan Administrator will, at the direction of Unocal, make such purchases from
Unocal or on the open market. An owner will not pay brokerage commissions,
fees or other charges on purchases with dividends. An owner will pay only a
fee on purchases with optional cash deposits. See Question 3. Also, a broker,
bank or other nominee may reinvest dividends and make optional cash deposits
on behalf of a beneficial owner.
 
                  KEEP THIS PROSPECTUS FOR FUTURE REFERENCE.
 
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES  AND
  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE  SECURI-
   TIES AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  PASSED
    UPON THE ACCURACY  OR ADEQUACY OF  THIS PROSPECTUS. ANY  REPRESENTATION
     TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
  This Prospectus does not constitute an offer to sell or a solicitation of an
offer to buy any of the securities offered hereby in any jurisdiction to any
person to whom it is unlawful to make such an offer or solicitation in such
jurisdiction. No person has been authorized to give any information or to make
any representations, other than those contained in this Prospectus, in
connection with the offering made hereby, and if given or made, such
information or representations must not be relied upon as having been
authorized by Unocal.
 
  No underwriting discounts or commissions will be paid.
 
               The date of this Prospectus is November 10, 1995.
<PAGE>
 
                             AVAILABLE INFORMATION
 
  Unocal is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, Judiciary
Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, as well as at the
following regional offices of the Commission: 7 World Trade Center, 13th
Floor, New York, New York 10048; and 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661-2511. Copies of such material can also be obtained
from the Commission's Public Reference Section at Room 1024, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. Such
reports, proxy statements and other information can also be inspected at the
offices of the New York Stock Exchange, 20 Broad Street, 17th Floor, New York,
New York 10005; the Chicago Stock Exchange, 440 S. LaSalle Street, Suite 518,
Chicago, Illinois 60605; and the Pacific Stock Exchange, 115 Sansome Street,
3rd Floor, San Francisco, California 94104. The Common Stock is listed on
those Exchanges.
 
  Unocal has filed with the Commission registration statements on Form S-3
(together with all amendments and exhibits thereto, the "Registration
Statements") under the Securities Act of 1933, as amended, with respect to the
securities offered hereby. This Prospectus does not contain all of the
information set forth in the Registration Statements, certain parts of which
are omitted in accordance with the rules and regulations of the Commission.
For further information, reference is made to the Registration Statements,
which may be examined without charge at the public reference facilities and
regional offices of the Commission referred to above.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents filed with the Commission by Unocal are incorporated
by reference into this Prospectus as of their respective filing dates:
 
  (a) Annual Report on Form 10-K for the fiscal year ended December 31, 1994;
  (b) Quarterly Reports on Form 10-Q for the quarterly periods ended March
      31, June 30 and September 30, 1995;
  (c) Current Reports on Form 8-K dated January 30, January 31, April 26,
      July 24, August 29 and October 26, 1995; and
  (d) The descriptions of the Common Stock (including the associated
      Preferred Stock Purchase Rights) and the Preferred Stock (insofar as
      the rights thereof may materially limit or qualify the rights evidenced
      by, or amounts payable with respect to, the Common Stock) set forth
      under the captions "Description of the Common Stock" and "Description
      of the Preferred Stock" in the Prospectus dated February 3, 1995,
      included in the Registration Statement on Form S-3 of Union Oil Company
      of California and Unocal (File Nos.33-54861 and 33-54861-01), as
      amended by Amendment No. 1 thereto.
 
                                       2
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  All documents filed by Unocal pursuant to Sections 13(a), 13(c), 14 or 15(d)
of the Exchange Act subsequent to the date of this Prospectus and prior to the
termination of the offering made hereby shall be deemed to be incorporated by
reference into this Prospectus and to be a part hereof from the date of filing
such documents. Any statement contained in a document incorporated or deemed
to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Prospectus to the extent that a statement
contained herein, or in any other subsequently filed document which also is or
is deemed to be incorporated by reference herein, modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.
 
  Unocal will provide without charge to each person, including any beneficial
owner, to whom this Prospectus is delivered, upon the written or oral request
of any such person, a copy of any and all of the foregoing documents
incorporated herein by reference (other than exhibits to such documents,
unless such exhibits are specifically incorporated by reference into such
documents). Requests should be directed to Stockholder Services Department,
Unocal Corporation, P.O. Box 7600, Los Angeles, California 90051, or (800)
252-2233.
 
                              UNOCAL CORPORATION
 
  Unocal was incorporated in Delaware in 1983 to operate as the parent company
of Union Oil Company of California ("Union Oil"), which was incorporated in
California in 1890. Unocal is a fully integrated, energy resources company
with worldwide operations that encompass many aspects of energy production.
Unocal conducts substantially all of its operations through Union Oil and its
subsidiaries (collectively with Unocal, the "Company").
 
  The Company is principally engaged in the exploration for, and the
production, transportation and sale of, crude oil and natural gas in the
United States and foreign countries; and the manufacture, purchase,
transportation and marketing of petroleum and selected chemical products. The
Company is also engaged in exploration for, and the production and sale of,
geothermal resources. Other operations include the production and marketing of
specialty minerals and real estate development and sales.
 
  The principal executive offices of Unocal are located at 1201 West Fifth
Street, Los Angeles, California 90017, and the telephone number at that
address is (213) 977-7600. On and after November 27, 1995, the principal
executive offices will be located at 2141 Rosecrans Avenue, Suite 4000, El
Segundo, California 90245, and the telephone number at that address will be
(310) 726-7600.
 
                                       3
<PAGE>
 
                            DESCRIPTION OF THE PLAN
 
THE PLAN
 
  The Plan was adopted by Unocal's Board of Directors on September 27, 1993
and became effective on November 12, 1993.
 
  The following questions and answers set forth the provisions of and
constitute the Plan. Owners of Common Stock and Preferred Stock, to the extent
they do not participate in the Plan, will continue to receive declared cash
dividends. The text of the Plan is as follows:
 
PURPOSE
 
1. What is the purpose of the Plan?
 
    The Plan provides eligible owners of Common Stock and Preferred Stock
  with a convenient and economical method of investing cash dividends and
  optional cash deposits in shares of Common Stock. Funds from shares
  purchased from Unocal will be used for general corporate purposes. See "Use
  of Proceeds" below. The Plan is intended for the benefit of long-term
  investors and not for those who intend to participate in the Plan in
  pursuit of short-term transactional profits. Unocal reserves the right to
  terminate participation in the Plan by otherwise-eligible owners of Common
  Stock and Preferred Stock in order to eliminate practices which are
  inconsistent with the intent of the Plan. See Question 27.
 
PARTICIPANTS' OPTIONS
 
2. What options are available to Participants?
 
    Those eligible owners who participate in the Plan (each, a "Participant")
  may elect to have cash dividends paid on all or a portion of their shares
  of Common Stock as well as Preferred Stock automatically invested in shares
  of Common Stock. Cash dividends are paid on the Common Stock and Preferred
  Stock only if and when declared by Unocal's Board of Directors.
 
    Each month, a Participant may elect to invest optional cash deposits in
  shares of Common Stock, subject to a minimum monthly purchase limit of $50
  and a maximum monthly purchase limit of $10,000. No waivers of the minimum
  or maximum amounts will be granted. A Participant may make optional cash
  deposits even if dividends on the Participant's shares of Common Stock or
  Preferred Stock are not being invested.
 
ADVANTAGES
 
3. What are the advantages of the Plan?
 
    (a) The Plan provides Participants with the opportunity to invest cash
  dividends paid on all or a portion of their shares of Common Stock as well
  as Preferred Stock in shares of Common Stock at 97% of the market price.
  See Question 13.
 
                                       4
<PAGE>
 
    (b) The Plan provides Participants with the opportunity to make monthly
  investments of optional cash deposits, subject to minimum and maximum
  amounts, for the purchase of additional shares of Common Stock at the
  market price. See Question 16.
 
    (c) Unocal will pay brokerage commissions, fees, transfer taxes and
  similar charges for shares purchased with dividends.
 
    (d) A fee equal to only 5% of funds invested, with a maximum of $3.00 per
  transaction (the "Fee"), will be charged each Participant for shares
  purchased with optional cash deposits.
 
    (e) All optional cash deposits (less the Fee) and cash dividends will be
  fully invested in shares of Common Stock because the Plan permits
  fractional shares to be credited to Plan accounts. Dividends on such
  fractional shares, as well as on whole shares, will also be invested in
  additional shares, which will be credited to Plan accounts.
 
    (f) At no charge to a Participant, the Plan Administrator maintains the
  Participant's share position in the Plan by a book entry account.
 
    (g) Participants' record keeping is simplified by their receipt of
  statements of their book account(s) reflecting all current activity,
  including share purchases and withdrawals.
 
ADMINISTRATION
 
4. Who administers the Plan and what do they do?
 
    The plan administrator is Chemical Bank (the "Plan Administrator"). It
  will administer the Plan, which includes buying shares with dividends and
  optional cash deposits, selling shares, keeping records, sending statements
  of account to each Participant and performing other duties related to the
  Plan. Shares purchased for each Participant in the Plan will be held in
  safekeeping by or through the Plan Administrator until a written request is
  received from a Participant for issuance of a stock certificate for all or
  a portion of its shares or until a Participant's participation in the Plan
  is terminated. See Questions 23, 24 and 27.
 
    Unocal may adopt rules and regulations to facilitate administration of
  the Plan and has the right to replace the Plan Administrator at any time.
 
    The Plan Administrator also acts as dividend disbursing agent, a transfer
  agent and a registrar for the Common Stock and the Preferred Stock and is a
  lender to Union Oil and certain other subsidiaries of Unocal. Unocal, Union
  Oil and certain other subsidiaries of Unocal currently have, and may in the
  future enter into, various banking and other relationships with the Plan
  Administrator.
 
                                       5
<PAGE>
 
PARTICIPATION
 
5. Who is eligible to participate?
 
    Any Registered Owner or Beneficial Owner (as defined below) of 25 or more
  shares of Common Stock or Preferred Stock is eligible to participate in the
  Plan as further described herein; provided that such Registered Owner (or
  the Registered Owner in whose name a Beneficial Owner's shares are held of
  record) has an address of record in the United States. Notwithstanding the
  foregoing, no offer of Plan participation is being made in any jurisdiction
  in which such offer would be unlawful, and any Beneficial Owner residing in
  such a jurisdiction is ineligible to participate in the Plan.
 
    A "Registered Owner" is one whose shares are registered in its own name
  on the stockholder records maintained by Chemical Bank as transfer agent
  and registrar. A Registered Owner participates in the Plan by communicating
  directly with the Plan Administrator. See Questions 6 and 7.
 
    A "Beneficial Owner" is one whose shares are not registered in its own
  name but in the name of some other party (i.e., in the name of a bank,
  broker, or other nominee). Beneficial Owners cannot participate in the Plan
  by communicating directly with the Plan Administrator. Rather, a Beneficial
  Owner must make arrangements with its bank, broker, or other nominee to
  participate in its behalf. See Questions 6, 7 and 8. Unocal can give no
  assurance that a Beneficial Owner will be able to participate in the Plan.
 
    In order to enroll and remain in the Plan, a Participant must own no less
  than 25 shares of Common Stock or Preferred Stock. Ownership as a
  Registered Owner and Beneficial Owner will not be aggregated to determine
  the number of shares owned.
 
6. How does an eligible Registered Owner or Beneficial Owner become a
   Participant?
 
    An eligible Registered Owner may enroll in the Plan by completing and
  signing an Authorization Card and returning it to the Plan Administrator.
  Once enrolled in the Plan, Participants will remain enrolled without
  further action on their part. Each Registered Owner must sign the
  Authorization Card exactly as its name is printed on the Authorization
  Card. See Question 7.
 
    An eligible Beneficial Owner who wishes to participate in the Plan must
  instruct its bank, broker or other nominee to complete and sign the
  Authorization Card and return it to the Plan Administrator.
 
                                       6
<PAGE>
 
    WRITTEN REQUESTS FOR AUTHORIZATION CARDS SHOULD BE DIRECTED TO THE PLAN
  ADMINISTRATOR AT:
 
    CHEMICAL BANK
    DIVIDEND REINVESTMENT DEPARTMENT
    4 COMMERCE COURT
    STATION SQUARE
    3RD FLOOR
    PITTSBURGH, PENNSYLVANIA 15219-1173
 
    OR CALL (800) 279-1249.
 
7. What does the Authorization Card do?
 
    By signing an Authorization Card, the Registered Owner appoints the Plan
  Administrator as its agent and is deemed to direct Chemical Bank in its
  role as disbursing agent to retain the Participant's cash dividends on all
  or otherwise specified number of shares of Common Stock and Preferred Stock
  owned by the Participant on the applicable record date ("Participating
  Shares"), as well as on all whole and fractional shares of Common Stock
  credited to a Participant's Plan account ("Plan Shares").
 
    The Authorization Card directs the Plan Administrator to purchase shares
  of Common Stock through the following investment options:
 
      (1) "Full Dividend Reinvestment". The Plan Administrator will apply
    all cash dividends on all shares of Common Stock and Preferred Stock
    then or subsequently registered in the Registered Owner's name and all
    dividends on all its Plan Shares, together with any optional cash
    deposit (less the Fee), toward the purchase of additional shares of
    Common Stock.
 
      (2) "Partial Dividend Reinvestment". The Plan Administrator will
    apply all cash dividends on only the specified number of Participating
    Shares in the Registered Owner's name and all dividends on all its Plan
    Shares, together with any optional cash deposit (less the Fee), toward
    the purchase of additional shares of Common Stock. The Participating
    Shares and the Plan Shares may not, in the aggregate, be less than 25.
 
      (3) "Optional Cash Deposits Only". The Plan Administrator will apply
    any optional cash deposit, less the Fee, toward the purchase of
    additional shares of Common Stock. See Question 16 for limitations on
    the amount of an optional cash deposit.
 
    Any one of the options (1), (2) or (3) may be selected. An Authorization
  Card not correctly or completely filled out is void and will be returned to
  the Registered Owner.
 
                                       7
<PAGE>
 
    All shares purchased pursuant to the above options will be Plan Shares
  and all subsequent dividends paid thereon will be invested in additional
  shares of Common Stock. If a Participant would prefer to receive cash
  payments of dividends paid on Plan Shares rather than reinvest such
  dividends, those shares must be withdrawn from the Plan by written
  notification to the Plan Administrator. See Question 24.
 
    Optional cash deposits on behalf of Beneficial Owners may require
  additional written certification from their bank, broker or other nominee.
  See Question 8.
 
8. What special procedure must be followed for Beneficial Owners to make
   optional cash deposits?
 
    The Plan Administrator will not accept from a bank, broker or other
  nominee an optional cash deposit in excess of $10,000 unless it is
  accompanied by a written certification duly executed on behalf of the bank,
  broker or other nominee, in form and substance acceptable to the Plan
  Administrator, warranting and representing to the Plan Administrator and
  Unocal that no single Beneficial Owner is making an optional cash deposit
  in excess of $10,000.
 
9. When may an Owner enroll in the Plan?
 
    Registered Owners and Beneficial Owners of Common Stock or Preferred
  Stock may enroll or be enrolled in the Plan at any time. Once enrolled,
  Participants remain enrolled until their participation or the Plan is
  terminated. See Questions 27 and 32.
 
10. When is a Participant's enrollment in the Plan effective?
 
    For enrollment to be effective with respect to a particular dividend, an
  Authorization Card must be received by the Plan Administrator from a
  Registered Owner before the record date established for such dividend. If
  the Authorization Card is received on or after that record date, the
  investment of dividends will begin on the payment date of the next
  dividend.
 
    For enrollment to be effective with respect to a particular optional cash
  deposit, an Authorization Card must be received by the Plan Administrator
  from a Registered Owner no less than two full business days prior to the
  monthly investment date (the "Investment Date"). The Investment Date is the
  date of payment for dividends on Common Stock or Preferred Stock, or in a
  month without a dividend payment date, the tenth day of the month that the
  New York Stock Exchange is open for trading.
 
11. How may a Participant elect a different investment option under the Plan?
 
    A Registered Owner may change its investment option at any time by
  submitting a new Authorization Card to the Plan Administrator. See
  Questions 6 and 7.
 
    A Beneficial Owner may cause its investment option to be changed by
  having its bank, broker, or other nominee submit a new Authorization Card
  to the Plan Administrator. See Questions 6 and 7.
 
                                       8
<PAGE>
 
PURCHASES
 
  UNDER NO CIRCUMSTANCE WILL INTEREST BE PAID BY UNOCAL OR THE PLAN
  ADMINISTRATOR ON DIVIDENDS OR OPTIONAL CASH DEPOSITS HELD PENDING
  INVESTMENT.
 
12. What is the date of purchase for dividend reinvestments?
 
    Payment dates will be established for dividends declared from time-to-
  time by Unocal's Board of Directors on its Common Stock and Preferred
  Stock. Shares purchased from Unocal with such dividends will be purchased
  as of the related dividend payment dates. Open market purchases will
  commence on any such payment date and continue in a prompt manner until
  completed. However, Unocal may in its sole discretion, having regard to
  applicable securities laws, defer the sale of shares to the Plan
  Administrator or direct the Plan Administrator to defer open market
  purchases to a later date if necessary or advisable.
 
  THE PLAN DOES NOT CREATE A DIVIDEND POLICY OR GUARANTEE THE PAYMENT OF
  FUTURE DIVIDENDS. THE DECLARATION AND PAYMENT OF ANY DIVIDEND IS SUBJECT TO
  THE SOLE DETERMINATION OF UNOCAL'S BOARD OF DIRECTORS BASED UPON UNOCAL'S
  EARNINGS, FINANCIAL CONDITION AND OTHER FACTORS.
 
13. What will be the price to Participants of shares purchased with invested
    dividends?
 
    The price per share of Common Stock purchased from Unocal with dividends
  on Common Stock or Preferred Stock will be 97% of the average, computed to
  three decimal places, of the daily high and low prices of the Common Stock,
  as reported for New York Stock Exchange Composite Transactions by Reuters
  America Inc. (or, if Reuters America Inc. quotations are not available for
  any such day, as reported by The Wall Street Journal) for the three days
  that the Common Stock is traded on the New York Stock Exchange immediately
  prior to the payment date of the dividend.
 
    The price per share of Common Stock purchased other than from Unocal will
  be 97% of the weighted average, computed to three decimal places, of the
  purchase prices for all of the Common Stock purchased by the Plan
  Administrator with the total amount of each such dividend being reinvested.
 
14. What is the date of purchase for optional cash deposits?
 
    Shares purchased from Unocal with optional cash deposits will be
  purchased as of each Investment Date. See Question 10 for the definition of
  Investment Date. If you have a question regarding the date of an Investment
  Date, contact the Plan Administrator. See Question 6. Open market purchases
  will commence on the Investment Date and will continue in a prompt manner
  until completed. However, Unocal may in its sole discretion, having regard
  to applicable securities laws, defer the sale of shares to the Plan
  Administrator or direct the Plan Administrator to defer open market
  purchases to a later date if necessary or advisable.
 
                                       9
<PAGE>
 
15. What will be the price to Participants of shares purchased with optional
    cash deposits?
 
    The price per share of Common Stock purchased from Unocal with an
  optional cash deposit will be 100% of the average, computed to three
  decimal places, of the daily high and low prices of the Common Stock, as
  reported for New York Stock Exchange Composite Transactions by Reuters
  America Inc. (or, if Reuters America Inc. quotations are not available for
  any such day, as reported by The Wall Street Journal) for the three days
  that the Common Stock is traded on the New York Stock Exchange immediately
  prior to the Investment Date.
 
    The price per share of Common Stock purchased on the open market with an
  optional cash deposit will be 100% of the weighted average, computed to
  three decimal places, of the purchase prices of all of the Common Stock
  purchased by the Plan Administrator as of each Investment Date.
 
16. What limitations apply to optional cash deposits?
 
    Each of a Participant's optional cash deposits is subject to a minimum
  monthly purchase limit of $50 and a maximum monthly purchase limit of
  $10,000. See Question 8 for the special procedure for optional cash
  deposits made on behalf of Beneficial Owners. Optional cash deposits of
  less than $50 or in excess of $10,000 will be returned to the Registered
  Owner without interest.
 
    Participants in the Plan are not obligated at any time to make an
  optional cash deposit. Optional cash deposits need not be for the same
  amount each month.
 
17. When must optional cash deposits be received?
 
    An optional cash deposit must be received by the Plan Administrator no
  less than two full business days prior to the Investment Date. See Question
  10 for the definition of Investment Date. If you have a question regarding
  the date of an Investment Date, contact the Plan Administrator. See
  Question 6.
 
    WIRE TRANSFERS MAY BE MADE, BUT ONLY IF APPROVED IN WRITING IN ADVANCE BY
  THE PLAN ADMINISTRATOR. Optional cash deposits must be in U.S. dollars.
  Optional cash deposits received other than as aforesaid will be returned to
  the Registered Owner without interest.
 
 
18. May a Participant have its optional cash deposit returned?
 
    Upon written request from a Participant received by the Plan
  Administrator at least two full business days prior to an Investment Date,
  an optional cash deposit will be returned to a Participant. See Question 10
  for the definition of Investment Date. If you have a question regarding the
  date of an Investment Date, contact the Plan Administrator. See Question 6.
 
19. How will the number of shares purchased for a Participant be determined?
 
    A Participant's account in the Plan will be credited with that number of
  shares, including fractions computed to four decimal places, equal to the
  amount to be invested on behalf of
 
                                       10
<PAGE>
 
  such Participant divided by the purchase price per share as calculated
  pursuant to the methods described in Question 13 or 15, as applicable. The
  Fee will be deducted from each Participant's optional cash deposit prior to
  its investment. See Question 3.
 
20. What is the source of Common Stock purchased under the Plan?
 
    At the option of Unocal, Plan Shares will be purchased by the Plan
  Administrator either directly from Unocal, in which event such shares will
  be either authorized but unissued shares or shares held in the treasury, on
  the open market, or by a combination of the foregoing.
 
    Neither Unocal nor any Participant will have any authority or power to
  direct the selection of the broker or dealer through which open market
  purchases are to be made or from whom such purchases will be made.
 
COSTS
 
21. Are there any expenses to Participants in connection with their
    participation under the Plan?
 
    Participants will be charged a fee for purchases made with optional cash
  deposits of 5% of the funds invested, with a maximum of $3.00 per
  transaction. See Question 3.
 
    There will be a charge of $5.00 each time a Participant sends stock
  certificates to the Plan Administrator for safekeeping. See Question 23.
 
    Participants will pay any applicable transfer taxes and a charge of $5.00
  each time a stock certificate is issued for Plan Shares. See Questions 24
  and 27.
 
    Participants that request that the Plan Administrator sell their shares
  in the event of their withdrawal from the Plan or if the Plan is terminated
  must pay any related brokerage commissions, fees, any applicable transfer
  taxes and a $15.00 administration fee. See Question 27.
 
REPORTS TO PARTICIPANTS
 
22. What kinds of reports will be sent to Participants?
 
    A statement of account will be mailed to a Participant for each month
  that there is activity in the Participant's account. The statement will
  provide a record of the number of shares then held in the Participant's
  account by the Plan Administrator, account activity, and the cost of the
  Participant's purchases under the Plan. Statements should be retained for
  tax purposes.
 
    Each Participant that is a Registered Owner will receive annually from
  Unocal an Internal Revenue Service information statement (on Form 1099-DIV)
  for reporting dividend income received.
 
                                      11
<PAGE>
 
STOCK CERTIFICATES AND SAFEKEEPING
 
23. Will certificates be issued for stock purchased?
 
    All shares acquired pursuant to the Plan for which certificates have not
  been issued to a Participant will be held in the name of the Plan
  Administrator or its nominee. Stock certificates will be issued to any
  Participant upon specific or blanket written request unless the Plan
  Administrator can demonstrate that blanket requests would lead to a
  proliferation of certificates that would result in an undue administrative
  burden. See Question 24.
 
    Each Participant's Plan account will be maintained in the name in which
  the Participant's stock was shown as registered on the Authorization Card.
  Stock certificates for whole shares purchased under the Plan will be
  similarly registered when issued upon a Participant's request. If a
  Participant is a Beneficial Owner, such request must be placed through
  Participant's banker, broker or other nominee. A Participant who wishes to
  pledge shares credited to such Participant's Plan account must first
  withdraw such shares from the account.
 
    Participants may deliver unendorsed stock certificates to the Plan
  Administrator for safekeeping along with the Authorization Card when
  enrolling those shares in the Plan, or may do so at any time thereafter
  accompanied by a written request while participating in the Plan. There is
  a charge of $5.00 for each such deposit irrespective of the number of
  shares. A check for that amount drawn to the order of Chemical Bank must
  accompany each mailing of stock certificates. THE PARTICIPANT IS
  RESPONSIBLE FOR ANY LOSS IN TRANSIT OF ANY STOCK CERTIFICATE MAILED TO THE
  PLAN ADMINISTRATOR. THE USE OF REGISTERED INSURED MAIL IS SUGGESTED. The
  Plan Administrator may at its election maintain Plan shares and stock
  certificates held for safekeeping in its name or in the name of its
  nominee.
 
WITHDRAWAL OF SHARES FROM PLAN ACCOUNTS
 
24. How may shares be withdrawn from the Plan?
 
    A Participant who is a Registered Owner may withdraw Plan Shares by
  notifying the Plan Administrator in writing, specifying the number of
  shares to be withdrawn. A Participant who is a Beneficial Owner may
  withdraw Plan Shares only through its banker, broker or other nominee. A
  stock certificate for the number of whole shares of Common Stock so
  withdrawn will be issued to and registered in the name of the Registered
  Owner. The Participant must pay any applicable transfer taxes prior to
  delivery of the stock certificate. The Plan Administrator will advise the
  Participant of any such tax. Also a check for $5.00 drawn to the order of
  Chemical Bank for each certificate to be issued must accompany the request
  to withdraw shares. In no case will certificates for fractional shares of
  Common Stock be issued.
 
25. Will dividends on shares withdrawn from the Plan continue to be invested?
 
    If the Participant has authorized "Full Dividend Reinvestment," cash
  dividends with respect to shares withdrawn from a Participant's account
  will continue to be reinvested. If,
 
                                      12
<PAGE>
 
  however, the Participant has elected Partial Dividend Reinvestment, the
  Plan Administrator will continue to reinvest dividends on only the number
  of shares specified by the Participant on the Authorization Card and its
  remaining Plan Shares, if any. See Question 7.
 
26. Will dividends on a Participant's Plan Shares continue to be invested if
    the Participant sells or transfers its Plan Shares?
 
    No.
 
TERMINATION OF PARTICIPATION
 
27. How and when may participation in the Plan be terminated?
 
    A Participant may terminate its participation in the Plan at any time by
  providing written notice to the Plan Administrator before the next record
  date for the payment of dividends in respect to dividend investment or at
  least two full business days prior to the next Investment Date in respect
  to optional cash deposits. See Question 10 for the definition of Investment
  Date.
 
    Unocal may in its sole judgment direct the Plan Administrator to
  terminate a Participant from the Plan at any time if Unocal deems the
  practices of that Participant inconsistent with the intent of the Plan. See
  Question 1.
 
    Participation in the Plan may also be terminated if the Participant fails
  to continue to meet the eligibility requirements of the Plan. See Question
  5. A Participant's participation in the Plan may be terminated 90 days
  after the date of a letter to it advising that it has failed to maintain an
  aggregate ownership of at least 25 Participating Shares and Plan Shares of
  Common Stock or 25 shares of Preferred Stock unless during the said 90 day
  period it brings its share ownership up to the 25 share requirement.
 
    Upon termination of participation in the Plan, a Participant will receive
  a stock certificate for the number of whole shares in its account and a
  check in an amount equal to the value of any fraction of a share in the
  absence of a written request that all its Plan Shares be sold. Prior to
  delivery of the Plan Shares, the Participant must pay to the Plan
  Administrator any applicable transfer taxes and a charge of $5.00 for each
  stock certificate issued. The Plan Administrator will advise the
  Participant of the amount of such transfer taxes. If a Participant requests
  that all its Plan shares be sold, the sale will be made by the Plan
  Administrator at the prevailing market price as soon as practicable after
  such request is received. The Participant will receive the proceeds of the
  sale, less any related brokerage commissions, fees, any applicable transfer
  taxes and a $15.00 administration fee.
 
STOCK DIVIDENDS AND STOCK SPLITS
 
28. What happens if Unocal issues a dividend payable in stock or declares a
    stock split?
 
    Any stock dividends or split shares distributed by Unocal on Common Stock
  will be credited pro rata to each Participant's account.
 
                                      13
<PAGE>
 
VOTING RIGHTS
 
29. How will the Plan Administrator vote stock credited to a Participant's
    account in the Plan at stockholders' meetings?
 
    The Plan Administrator will vote stock in its custody only in accordance
  with instructions from the Participants.
 
INCOME TAX CONSEQUENCES TO PARTICIPANTS
 
30. What are the income tax consequences of participation in the Plan?
 
    The following summary is based upon an interpretation of current Federal
  tax law.
 
    The fair market value of stock purchased with invested dividends will be
  treated as income to the Participant for Federal Income Tax purposes as of
  the dividend payment date. Brokerage commissions, any transfer taxes and
  any similar charges paid by Unocal on behalf of a Participant will be
  treated as a constructive distribution subject to income tax in the same
  manner as dividends.
 
    If a Participant is subject to backup withholding, only the net amount of
  the dividend less the backup withholding will be invested. Reports to
  Participants will show the amount of dividends invested and tax withheld.
  See Question 22.
 
    Each Participant which for Federal Income Tax purposes is deemed to have
  received a distribution will be provided with a year-end statement
  (currently IRS Form 1099-DIV) that will be needed to complete the
  Participant's Federal tax return. The statement will show the amount of
  dividends invested, any brokerage commissions and transfer taxes and any
  similar charges paid by Unocal and, if appropriate, any tax withheld.
 
    Some Participants may be subject to state income taxes and accompanying
  withholding requirements.
 
    Participants are urged to consult their tax advisors if they have any
  questions or as necessary to remain current on Federal and state tax
  consequences of being a Participant in the Plan.
 
RESPONSIBILITY OF UNOCAL AND THE PLAN ADMINISTRATOR
 
31. What are the responsibilities of Unocal and the Plan Administrator under
    the Plan?
 
    Neither Unocal nor the Plan Administrator will be liable for any act done
  in good faith or for any good faith omission to act, including, without
  limitation, any claim of liability arising out of failure to terminate a
  Participant's account upon such Participant's death, the prices at which
  shares are purchased for the Participant's account, the times when
  purchases are made, or fluctuations in the market value of Common Stock.
 
                                      14
<PAGE>
 
    The Participant should recognize that neither Unocal nor the Plan
  Administrator can provide any assurance of a profit or protection against
  loss on stock purchased pursuant to the Plan.
 
SUSPENSION, MODIFICATION OR TERMINATION OF THE PLAN
 
32. May the Plan be suspended, modified or terminated?
 
    Unocal reserves the right without notice to suspend or terminate the Plan
  at any time whatsoever. Participants will be notified of any such
  suspension or termination. Unocal also reserves the right in its sole
  discretion to make modifications to the Plan and, in such event, will
  provide Participants with a copy of any material modification. Upon
  termination of the Plan, except in the circumstances described below, any
  uninvested optional cash deposits will be returned, a stock certificate for
  whole shares credited to each Participant's Plan account will be issued and
  a cash payment will be made for any fractional share.
 
    In the event that Unocal terminates the Plan and concurrently establishes
  a plan similar to the Plan, Participants will be automatically enrolled in
  such other plan and shares credited to their Plan accounts will be credited
  automatically to such other plan, unless the Plan Administrator is notified
  to the contrary.
 
OTHER INFORMATION
 
33. How may Participants obtain answers to questions regarding their Plan
    accounts or how may Stockholders obtain answers to other questions
    regarding the Plan?
 
    Questions concerning Plan accounts should be addressed to the Plan
  Administrator at the address and telephone number provided at Question 6.
 
34. Who bears the risk of market fluctuations in Common Stock?
 
    Each Participant bears all risk of loss that may result from market
  fluctuations in the price of the Common Stock.
 
    Neither Unocal nor the Plan Administrator can guarantee that shares
  purchased under the Plan will, at any particular time, be worth more or
  less than their purchase price.
 
35. Who interprets the Plan?
 
    Any question of interpretation arising under the Plan will be determined
  by Unocal, and any such determination will be final. Unocal may adopt rules
  and regulations to facilitate the administration of the Plan. The terms and
  conditions of the Plan and its operation will be governed by the laws of
  the State of New York.
 
                                      15
<PAGE>
 
36. What are some of the responsibilities of Participants under the Plan?
 
  PARTICIPANTS BEAR THE RISK OF LOSS FOR ALL STOCK CERTIFICATES TRANSMITTED
  BY THEM TO THE PLAN ADMINISTRATOR.
 
    Shares held in the name of the Plan are subject to escheat pursuant to
  the applicable state's laws in the event that such shares are deemed, under
  such state's laws, to have been abandoned by the Participant. In order to
  avoid in some instances the operation of the escheat laws, a Participant
  should notify the Plan Administrator promptly in writing of any change of
  address. Account statements and other communications to a Participant will
  be addressed to it at the last address of record provided by the
  Participant to the Plan Administrator.
 
                                USE OF PROCEEDS
 
  The net proceeds from the sale of the Common Stock purchased from Unocal
pursuant to the Plan will be used for the general corporate purposes of
Unocal, including investments in, contributions to, or extensions of credit to
Unocal's subsidiaries.
 
                          DESCRIPTION OF COMMON STOCK
 
GENERAL
 
  The following summary of the rights of the Common Stock does not purport to
be complete and is subject in all respects to the applicable provisions of the
Delaware General Corporation Law, Unocal's Certificate of Incorporation,
Unocal's Bylaws and the Rights Agreement dated January 29, 1990 between Unocal
and Chemical Trust Company of California, as Rights Agent.
 
  Dividend Rights: Subject to the prior rights, if any, of the holders of the
outstanding shares of Preferred Stock and any additional preferred stock which
may be issued in the future, holders of Common Stock are entitled to receive
such dividends as are declared by Unocal's Board of Directors out of funds
legally available therefor.
 
  Voting Rights: Subject to the rights, if any, of the holders of preferred
stock, all voting rights are vested in the holders of shares of Common Stock,
each share being entitled to one vote on all matters presented for a vote
(except for those matters for which a separate class vote is required under
Delaware law). The holders of one-third of the shares entitled to vote
constitute a quorum at any meeting of stockholders.
 
  Liquidation Rights: Subject to the prior rights of the holders of preferred
stock, in the event of the liquidation of Unocal, holders of Common Stock will
share pro rata in all assets distributable to stockholders in respect of
shares held by them.
 
                                      16
<PAGE>
 
  Preemptive Rights: Holders of Common Stock are not entitled to any
preemptive rights to subscribe for any additional securities that may be
issued.
 
  Non-Cumulative Voting and Classes of Directors: Holders of shares of Common
Stock have non-cumulative voting rights. Subject to rights of holders of
preferred stock, including the rights of holders of the Preferred Stock, to
elect two additional members to the board of directors if the equivalent of
six quarterly dividends payable on the Preferred Stock or on any series of
preferred stock of Unocal are in default, holders of more than 50% of the
shares of Common Stock voting for the election of directors can elect 100% of
the directors standing for election if they choose to do so. Unocal's Board of
Directors is divided into three classes, and directors are normally elected
for three year terms. One of the classes is presented for election at each
annual meeting, so that the entire Board of Directors is never presented for
election in any one year.
 
RIGHTS TO PURCHASE SERIES A PREFERRED STOCK
 
  In January, 1990, Unocal's Board of Directors adopted a stockholder rights
plan (the "Rights Plan") and declared a dividend of one right (a "Right";
collectively, the "Rights") for, and to be attached to, each outstanding share
of Common Stock. The resolutions creating the Rights Plan provide that as long
as the Rights are attached to shares of Common Stock one additional Right will
be issued and delivered with each share of Common Stock that becomes
outstanding after February 12, 1990, including the shares of Common Stock
offered hereby. Each Right entitles the holder thereof to purchase one one-
hundredth of a share of preferred stock designated as the Series A Junior
Participating Cumulative Preferred Stock ("Series A Preferred Stock").
 
  The Rights will expire on January 29, 2000, unless redeemed earlier, and
will not be exercisable or transferable separately from the shares of Common
Stock until the close of business on the distribution date, which will occur
on the earlier of (i) the tenth day following a public announcement that a
person or group of affiliated or associated persons (a "15% Stockholder") has
acquired, or obtained the right to acquire, beneficial ownership of 15% or
more of the outstanding Common Stock or (ii) the date of the commencement or
the announcement of an intention to make a tender or exchange offer that would
cause any person or group to become a 15% Stockholder.
 
  Pursuant to the Rights Plan, 3,000,000 shares of Series A Preferred Stock
have been designated and reserved for issuance upon exercise of the Rights. A
description of the Rights and the Series A Preferred Stock is set forth in the
Rights Agreement, dated January 29, 1990, between Unocal and Chemical Trust
Company of California, as Rights Agent, which is included as exhibit to the
Registration Statements of which this Prospectus is a part.
 
CERTAIN PROVISIONS OF THE CERTIFICATE OF INCORPORATION AND BYLAWS OF UNOCAL
 
  The Certificate of Incorporation and Bylaws of Unocal contain certain
provisions which may have the effect of rendering a change of control of
Unocal more difficult. The Certificate of Incorporation provides that the
Board of Directors is divided into three classes, with the directors serving
three-year staggered terms. Special meetings of Unocal's stockholders
generally may be
 
                                      17
<PAGE>
 
called only by the Board of Directors, and any action required or permitted to
be taken by the stockholders must be taken at an annual or special meeting and
may not be effected by written consent. The vote of 75% of the outstanding
stock of Unocal entitled to vote is required for the stockholders to adopt,
amend or repeal bylaws. Such a 75% vote is also required for approval of a
merger or consolidation of Unocal with, and certain other transactions with,
another corporation which, with its affiliates, owns beneficially more than
10% of the total voting power of all outstanding shares of Unocal voting stock
(a "Related Corporation"), unless such a transaction was approved by 75% of
the directors of Unocal prior to the Related Corporation becoming such. The
Certificate of Incorporation also requires such a 75% vote to repeal or amend
any of the foregoing provisions.
 
  The Bylaws of Unocal require 30 days' advance notice of, and specified
information with respect to, nominations by stockholders of persons for
election as directors and other business to be brought before an annual
meeting by a stockholder.
 
  Under Unocal's Certificate of Incorporation, the Board of Directors has the
authority, without further stockholder action, to provide for the issuance of
Unocal preferred stock and to fix the terms thereof. Provisions which could
render a change of control of Unocal more difficult, such as extraordinary
voting, dividend, redemption or conversion rights, could be included in such
Unocal preferred stock.
 
                INDEMNIFICATION FOR SECURITIES ACT LIABILITIES
 
  Unocal's Bylaws provide for the mandatory indemnification of directors and
officers. Directors and officers of Unocal have a contractual right to
indemnification when they are made parties or threatened to be made parties
to, or involved in, any action, suit, or proceeding, civil or criminal,
administrative or investigative, by reason of the fact that they were a
director or an officer of Unocal. They are also covered by insurance policies
indemnifying them against certain civil liabilities, including liabilities
under the federal securities laws. Insofar as indemnification for liabilities
arising under the Securities Act of 1933 may be permitted to directors,
officers or persons controlling the registrant pursuant to the foregoing
provisions, the registrant has been informed 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.
 
                                      18
<PAGE>
 
                                    EXPERTS
 
  The consolidated financial statements and financial statement schedule of
Unocal and its subsidiaries as of December 31, 1994 and 1993, and for each of
the three years in the period ended December 31, 1994, included in the 1994
Annual Report on Form 10-K of Unocal incorporated by reference in this
Prospectus, have been incorporated herein in reliance on the report of Coopers
& Lybrand L.L.P., independent accountants, which report is incorporated by
reference herein, and on the authority of that firm as experts in accounting
and auditing. Such report includes an explanatory paragraph with respect to
the changes in methods of accounting for the impairment of producing oil and
gas properties in 1994; for postretirement benefits other than pensions and
for postemployment benefits in 1993; and for income taxes in 1992.
 
  The information concerning estimates of proved oil and gas and geothermal
reserves attributable to the Company, included in the 1994 Annual Report on
Form 10-K of Unocal incorporated by reference in this Prospectus, has been
prepared by the Company's petroleum engineering staff and certified by John F.
Imle, Jr., a director and President of Unocal, and has been incorporated by
reference in this Prospectus in reliance upon the authority of Mr. Imle as an
expert in the field of petroleum engineering. As of September 30, 1995, Mr.
Imle owned 37,412 shares of Common Stock. Mr. Imle also held options to
purchase 124,436 shares of Common Stock at prices ranging from $11.1563 to
$30.0625, with expiration dates ranging from 1996 to 2005. In addition, he
held 33,017 performance share units, which could be paid out in up to 66,034
shares of Common Stock four years after their award dates, depending upon
Unocal's total return to stockholders.
 
                                 LEGAL MATTERS
 
  Legal matters in connection with the issuance and sale of the Securities
offered hereby will be passed upon for Unocal by Dennis P. R. Codon, Esq.,
Vice President, General Counsel, Chief Legal Officer and Corporate Secretary
of Unocal. As of September 30, 1995, Mr. Codon owned 11,086 shares of Common
Stock. He also held options to purchase 38,715 shares of Common Stock at
prices ranging from $20.5313 to $30.0625, with expiration dates ranging from
2000 to 2005. In addition, Mr. Codon held 14,454 performance share units,
which could be paid out in up to 28,908 shares of Common Stock on the basis
described in the preceding paragraph.
 
                                      19
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Available Information......................................................   2
Incorporation of Certain Documents
 by Reference..............................................................   2
Unocal Corporation.........................................................   3
Description of the Plan....................................................   4
  The Plan.................................................................   4
  Purpose..................................................................   4
  Participants' Options....................................................   4
  Advantages...............................................................   4
  Administration...........................................................   5
  Participation............................................................   6
  Purchases................................................................   9
  Costs....................................................................  11
  Reports to Participants..................................................  11
  Stock Certificates and Safekeeping.......................................  12
  Withdrawal of Shares from Plan Accounts..................................  12
  Termination of Participation.............................................  13
  Stock Dividends and Stock Splits.........................................  13
  Voting Rights............................................................  14
  Income Tax Consequences to Participants..................................  14
  Responsibility of Unocal and the Plan Administrator......................  14
  Suspension, Modification or Termination of the Plan......................  15
  Other Information........................................................  15
Use of Proceeds............................................................  16
Description of Common Stock................................................  16
  General..................................................................  16
  Rights to Purchase Series A Preferred Stock..............................  17
  Certain Provisions of the Certificate of Incorporation and Bylaws of
   Unocal..................................................................  17
Indemnification for Securities Act
 Liabilities...............................................................  18
Experts....................................................................  19
Legal Matters..............................................................  19
</TABLE>
 
 
                                  PROSPECTUS
 
                              [LOGO OF UNOCAL 76]
 
                              UNOCAL CORPORATION
 
                             DIVIDEND REINVESTMENT
                                      AND
                                 COMMON STOCK
                                 PURCHASE PLAN
 
                               6,303,966 SHARES
 
                         COMMON STOCK, $1.00 PAR VALUE


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