UNIMARK GROUP INC
8-K/A, 1998-07-22
CANNED, FRUITS, VEG, PRESERVES, JAMS & JELLIES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                   FORM 8-K/A

                        AMENDMENT NO. 1 TO CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of Report (Date of earliest event reported):  June 24, 1998



                             THE UNIMARK GROUP, INC.
               (Exact name of Registrant as specified in charter)




          Texas                        1-13242              75-2436543
(State or other jurisdiction   (Commission File Number)  (I.R.S. Employer
     of incorporation)                                   Identification No.)



                                  UNIMARK HOUSE
                                124 MCMAKIN ROAD
                               BARTONVILLE, TEXAS                76226
                     (Address of principal executive offices) (Zip Code)



Registrant's telephone number, including area code:           (817) 491-2992

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




<PAGE>   2



ITEM 5.           Other Events.

         On June 23, 1998, The UniMark Group, Inc., a Texas corporation (the
"Company"), issued a press release announcing that, in connection with exploring
strategic alternatives to maximize shareholder value, the Company had entered
into a Letter of Intent (the "Letter of Intent"), dated June 22, 1998, by and
between The UniMark Group, Inc. and Mexico Strategic Investment Fund, Ltd.
("MSIF") pursuant to which MSIF or an affiliate (the "Fund") would purchase
3,305,500 shares of Common Stock of the Company.

         The undersigned Registrant hereby amends its Current Report on Form 8-K
dated June 24, 1998 (the "Report"), to include the definitive agreements entered
into pursuant to the Letter of Intent, which were omitted from the Report as
initially filed in accordance with Item 7(c) of Form 8-K.

         On July 20, 1998, The UniMark Group, Inc., a Texas corporation (the
"Company"), issued a press release announcing that the Company had sold
3,305,500 newly issued shares of Common Stock at a purchase price of $4.5375 per
share, for an aggregate purchase price of $14,998,706 to M & M Nominee L.L.C.,
an affiliate of the Mexico Strategic Investment Fund, Ltd. In connection with
the transaction, the Company granted the Fund options to acquire an additional
2,000,000 shares of Common Stock, representation on the Company's Board of
Directors and certain veto rights regarding financial and corporate matters.

         The description of the agreement set forth herein does not purport to
be complete and is qualified in its entirety by the provisions of the
transaction agreements, copies of which have been filed as Exhibits 99.3
through 99.7 hereto, and which are incorporated by reference herein.

         The Fund is indirectly owned by a large number of institutional
investors and high net worth individuals who invest through Quantum Industrial
Partners L.D.C. and Quasar Strategic Partners L.D.C. (members of the Quantum
Group of Funds), and through other institutional accounts. The funds in the
Quantum Group of Funds are advised by Soros Fund Management L.L.C., an affiliate
of Mexico Strategic Advisors, L.L.C., the adviser to the Fund. The Fund's
investment program emphasizes long term investments in Latin American companies.

ITEM 7. Financial Statements, Pro Forma Financial Information and Exhibits.

         (c)  Exhibits.

                  Exhibit 99.1* - Letter of Intent, dated June 22, 1998, by and
                  between The UniMark Group, Inc. and Mexico Strategic
                  Investment Fund, Ltd.

                  Exhibit 99.2* - Press Release, dated June 23, 1998, announcing
                  that the Company has reached a binding agreement pursuant to
                  which Mexico Strategic Investment Fund, Ltd. or an affiliate
                  (the "Fund") will purchase 3,305,500 shares of Common Stock of
                  the Company, at a purchase price of $4.5375 per share for an
                  aggregate purchase price of $14,998,706.



<PAGE>   3



                  Exhibit 99.3 - Purchase Agreement, dated July 17, 1998, by and
                  between The UniMark Group, Inc., a Texas corporation, and M &
                  M Nominee, L.L.C., a Delaware limited liability corporation
                  (In accordance with Item 601(b)(2) of Regulation S-K, the
                  schedules to the Purchase Agreement have been excluded; such
                  schedules will be furnished supplementally upon request by the
                  Securities and Exchange Commission)

                  Exhibit 99.4 - First Stock Option Agreement, dated July 17,
                  1998, by and between M & M Nominee, L.L.C., a Delaware limited
                  liability corporation and The UniMark Group, Inc., a Texas
                  corporation

                  Exhibit 99.5 - Second Stock Option Agreement, dated July 17,
                  1998, by and between M & M Nominee, L.L.C., a Delaware limited
                  liability corporation and The UniMark Group, Inc., a Texas
                  corporation

                  Exhibit 99.6 - Registration Rights Agreement, dated July 17,
                  1998, by and between The UniMark Group, Inc., a Texas
                  corporation, and M & M Nominee, L.L.C., a Delaware limited
                  liability corporation

                  Exhibit 99.7 - Shareholders Agreement, dated July 17, 1998, by
                  and between M & M Nominee, L.L.C., a Delaware limited
                  liability corporation, Rafael Vaquero Bazan and Fernando
                  Camacho Casas

                  Exhibit 99.8 - Press Release, dated July 20, 1998, announcing
                  that the Company had sold 3,305,500 newly issued shares of
                  Common Stock at a purchase price of $4.5375 per share, for an
                  aggregate purchase price of $14,998,706 to M & M Nominee
                  L.L.C., an affiliate of the Mexico Strategic Investment Fund,
                  Ltd.

* Incorporated by reference to the Registrant's Current Report on Form 8-K,
dated June 24, 1998.

                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                            THE UNIMARK GROUP, INC.
                                  (Registrant)


Date: July 22, 1998         By:  /s/ Rafael Vaquero Bazan
                            -----------------------------------------------
                                     Rafael Vaquero Bazan
                                     President, Chief Executive Officer and
                                     Director


<PAGE>   4


                                  EXHIBIT INDEX

         Exhibit

         99.1*    - Letter of Intent, dated June 22, 1998, by and between The
                  UniMark Group, Inc. and Mexico Strategic Investment Fund, Ltd.

         99.2*    - Press Release, dated June 23, 1998, announcing that the
                  Company has reached a binding agreement pursuant to which
                  Mexico Strategic Investment Fund, Ltd. or an affiliate (the
                  "Fund") will purchase 3,305,500 shares of Common Stock of the
                  Company, at a purchase price of $4.5375 per share for an
                  aggregate purchase price of $14,998,706.

         99.3     - Purchase Agreement, dated July 17, 1998, by and between The
                  UniMark Group, Inc., a Texas corporation, and M & M Nominee,
                  L.L.C., a Delaware limited liability corporation (In
                  accordance with Item 601(b)(2) of Regulation S-K, the
                  schedules to the Purchase Agreement have been excluded; such
                  schedules will be furnished supplementally upon request by the
                  Securities and Exchange Commission)

         99.4     - First Stock Option Agreement, dated July 17, 1998, by and
                  between M & M Nominee, L.L.C., a Delaware limited liability
                  corporation and The UniMark Group, Inc., a Texas corporation

         99.5     - Second Stock Option Agreement, dated July 17, 1998, by and
                  between M & M Nominee, L.L.C., a Delaware limited liability
                  corporation and The UniMark Group, Inc., a Texas corporation

         99.6     - Registration Rights Agreement, dated July 17, 1998, by and
                  between The UniMark Group, Inc., a Texas corporation, and M &
                  M Nominee, L.L.C., a Delaware limited liability corporation

         99.7     - Shareholders Agreement, dated July 17, 1998, by and between
                  M & M Nominee, L.L.C., a Delaware limited liability
                  corporation, Rafael Vaquero Bazan and Fernando Camacho Casas

         99.8     - Press Release, dated July 20, 1998, announcing that the
                  Company had sold 3,305,500 newly issued shares of Common Stock
                  at a purchase price of $4.5375 per share, for an aggregate
                  purchase price of $14,998,706 to M & M Nominee L.L.C., an
                  affiliate of the Mexico Strategic Investment Fund, Ltd.

* Incorporated by reference to the Registrant's Current Report on Form 8-K,
dated June 24, 1998.

<PAGE>   1
                                                                    EXHIBIT 99.3










                               PURCHASE AGREEMENT
                                 BY AND BETWEEN
                             THE UNIMARK GROUP, INC.
                                       AND
                              M & M NOMINEE L.L.C.
                            Dated as of July 17, 1998





<PAGE>   2

<TABLE>
<S> <C>                                                                         <C>
1. ISSUANCE AND SALE OF PRIMARY SHARES...........................................2

    1.1. Definitions.............................................................2
    1.2. Issuance, Purchase and Sale of the Shares...............................2
    1.3. Closing.................................................................2
    1.4. Deliveries at Closing...................................................2

2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.................................4

    2.1. Organization and Qualification..........................................4
    2.2. Subsidiaries............................................................4
    2.3. Capitalization..........................................................4
    2.4. Due Authorization.......................................................5
    2.5. Non-contravention; Consents and Approvals...............................5
    2.6. SEC Reports.............................................................6
    2.7. Undisclosed Liabilities.................................................7
    2.8. Taxes...................................................................7
    2.9. Certain Changes.........................................................8
    2.10. Litigation; Compliance with Laws.......................................8
    2.11. Title to Properties; Insurance.........................................9
    2.12. ERISA..................................................................9
    2.13. Possession of Franchises, Licenses, Etc...............................10
    2.14. Environmental and Other Regulations...................................10
    2.15. Patents and Trademarks................................................11
    2.16. Material Contracts and Obligations....................................11
    2.17. Brokers...............................................................12
    2.18. Accuracy of Information...............................................12
    2.19. Offering of Primary Shares............................................12
    2.20. Costs of "Year 2000" Modifications....................................13

3. REPRESENTATIONS AND WARRANTIES OF EACH PURCHASER.............................13

    3.1. Organization and Qualification.........................................13
    3.2. Due Authorization......................................................13
    3.3. Acquisition for Investment.............................................13
    3.4. Brokers................................................................13
    3.5. Non-contravention; Consents and Approvals..............................13
    3.6. Accredited Investor....................................................14

4. COVENANTS OF THE COMPANY.....................................................14

    4.1. Negative Covenants.....................................................14
    4.2. Board Representation...................................................16
    4.3. Compliance with Laws...................................................17
    4.4. Insurance..............................................................17
    4.5. Preservation of Existence, Franchises..................................17
    4.6. Payment of Taxes and Other Charges.....................................18
    4.7. Reports; Access........................................................18
    4.8. Dividends..............................................................19
    4.9. Limitation on Agreements...............................................19
    4.10. Merger................................................................19
    4.11. Notice of Breach......................................................19
    4.12. Real Property Holding Company.........................................20

5. RESTRICTIONS ON TRANSFER.....................................................20
</TABLE>


                                      -i-

<PAGE>   3

<TABLE>
<S> <C>                                                                         <C>
6. INDEMNIFICATION..............................................................20

    6.1. Survival...............................................................20
    6.2. Indemnification........................................................21
    6.3  Procedures for Claims..................................................21
    6.4. Certain Provisions Regarding Indemnification...........................23

7. INTERPRETATION...............................................................24

    7.1. Definitions............................................................24
    7.2. Index to Defined Terms.................................................27
    7.3. Headings; Other Interpretation.........................................29

8. MISCELLANEOUS................................................................29

    8.1. Severability...........................................................29
    8.2. Specific Enforcement...................................................29
    8.3. Entire Agreement.......................................................29
    8.4. Counterparts...........................................................30
    8.5. Notices and Other Communications.......................................30
    8.6. Amendments; Termination; Waivers.......................................31
    8.7. Cooperation............................................................31
    8.8. Successors and Assigns; Parties in Interest............................31
    8.9. Expenses...............................................................32
    8.10. Transfer of Shares....................................................32
    8.11. Governing Law; Consent to Jurisdiction................................32
    8.12. Publicity.............................................................33
</TABLE>


                                      -ii-
<PAGE>   4


                  THIS PURCHASE AGREEMENT, dated as of July 17, 1998 (this
"Agreement"), by and between UNIMARK GROUP, INC., a Texas corporation (the
"Company") and M & M Nominee L.L.C., a Delaware limited liability company
("Purchaser").

                  WHEREAS, the Company's business consists primarily of (i)
vertically integrated citrus and tropical fruit growing, processing, marketing
and distribution operations and related activities (the "Fruit Processing
Operations"), and (ii) the production of citrus concentrate, oils and juices and
related activities (the "Juice and Oils Operations");

                  WHEREAS, the Company is authorized to issue 20,000,000 shares
of common stock, par value $0.01 per share, of the Company (the "Common Stock");

                  WHEREAS, Purchaser desires to purchase from the Company, and
the Company desires to issue to Purchaser, 3,305,500 newly issued shares of
Common Stock (the "Primary Shares") for a purchase price of U.S.$4.5375 per
share, or an aggregate purchase price of U.S.$14,998,706.25 in cash;

                  WHEREAS, in furtherance of such desires, the Company and
Mexico Strategic Investment Fund, Ltd. entered into a letter agreement, dated
June 22, 1998 (the "Letter Agreement") providing for the transactions
contemplated hereby;

                  WHEREAS, to induce Purchaser to purchase the Primary Shares,
the Company is contemporaneously herewith, and conditioned hereon, granting to
Purchaser (i) an option pursuant to which Purchaser shall have the right, for a
period of one year from the date hereof, to acquire up to 1,000,000 shares of
Common Stock (the "First Option") on terms specified in the First Stock Option
Agreement, dated as of the date hereof, between the Company and Purchaser (the
"First Option Agreement"), (ii) an option pursuant to which Purchaser shall have
the right, for a period of three years from the date hereof, to acquire up to
1,000,000 shares of Common Stock (the "Second Option" and, together with the
First Option, the "Options") on terms specified in the Second Stock Option
Agreement, dated as of the date hereof, between the Company and Purchaser (the
"Second Option Agreement" and, together with the First Option Agreement, the
"Option Agreements"), and (iii) registration rights as set forth in a
Registration Rights Agreement, dated as of the date hereof, between the Company
and Purchaser (the "Registration Rights Agreement");

                  WHEREAS, in connection herewith, and conditioned hereon, the
Board of Directors of the Company has amended the bylaws of the Company to
incorporate therein the provisions of Sections 4.1, 4.8 and 4.10; and

                  WHEREAS, contemporaneously herewith, certain shareholders of
the Company are entering into agreements with Purchaser to provide for certain
rights and 


<PAGE>   5

obligations in connection with the purchase and sale of the Primary Shares and
with respect to restrictions on sale by such shareholders of their shares of
Common Stock.


1.       Issuance and Sale of Primary Shares.

         1.1. Definitions. Certain capitalized terms used in this Agreement are
defined in Article 7. An index of defined terms is set forth in Section 7.2.

         1.2. Issuance, Purchase and Sale of the Shares. Upon the terms set
forth herein and subject to the contemporaneous deliveries set forth in Section
1.4, the Company is issuing to Purchaser, and Purchaser is buying from the
Company, the Primary Shares for a purchase price (the "Purchase Price") equal to
U.S.$14,998,706.25.

         1.3. Closing. The closing of the transactions contemplated hereby (the
"Closing") is taking place at the offices of Fried, Frank, Harris, Shriver &
Jacobson, New York, New York, contemporaneously herewith.

         1.4. Deliveries at Closing. (a) Contemporaneously herewith, the Company
is delivering the following:

                  (i)   a certificate or certificates representing the Primary
                        Shares;

                  (ii)  the First Option Agreement, executed by the Company;

                  (iii) the Second Option Agreement, executed by the Company;

                  (iv)  the Registration Rights Agreement, executed by the
                        Company;

                  (v)   a certificate, dated as of the date hereof, of the
                        chief executive officer or chief financial officer of
                        the Company certifying that (x) the representations
                        and warranties made by the Company herein are true
                        and correct, and (y) that the conditions set forth in
                        clauses (i) through (iv) of Paragraph 12 of the
                        Letter Agreement are true;

                  (vi)  a certificate, dated as of the date hereof, of the
                        secretary or other appropriate officer of the Company
                        certifying the names of the officer or officers of
                        the Company authorized to sign this Agreement and any
                        other documents provided for in this Agreement,
                        together with a sample of the true signature of each
                        such officer, and certifying as to the truth and
                        completeness of the following attachments to


                                      -2-
<PAGE>   6
                        such certificate: (x) a certified copy of the Company's 
                        current articles of incorporation and any amendments
                        thereto, (y) a copy of the Company's current bylaws
                        and any amendments thereto, and (z) resolutions of
                        the Board of Directors of the Company authorizing the
                        execution and delivery of this Agreement and any
                        other documents provided for herein and the performance
                        hereof and thereof; and

                  (vii) the opinion, dated as of the date hereof, of Jordaan
                        & Pennington, counsel to the Company, in the form set
                        forth in Exhibit A hereto.

         (b)      Contemporaneously herewith, Purchaser is delivering the
following:

                  (i)   the Purchase Price, payable in cash, in U.S. dollars,
                        by wire transfer of immediately available funds;

                  (ii)  a certificate, dated as of the date hereof, of the
                        chief executive officer or chief financial officer of
                        Purchaser certifying that the representations and
                        warranties made by Purchaser herein are true and
                        correct; and

                  (iii) a certificate, dated as of the date hereof, of the
                        secretary or other appropriate officer of Purchaser
                        certifying the names of the officer or officers of
                        Purchaser authorized to sign this Agreement and any
                        other documents provided for in this Agreement,
                        together with a sample of the true signature of each
                        such officer, and certifying as to the truth and
                        completeness of following attachments to such
                        certificate: (x) a certified copy of Purchaser's
                        current certificate of formation and any amendments
                        thereto, (y) a copy of Purchaser's current bylaws (or
                        equivalent document) and any amendments thereto, and
                        (z) resolutions of the governing or managing board of
                        Purchaser authorizing the execution and delivery of
                        this Agreement and any other documents provided for
                        herein and the performance hereof and thereof.



                                      -3-
<PAGE>   7


2.       Representations and Warranties of the Company.

         The Company represents and warrants as of the date hereof as follows:

         2.1. Organization and Qualification. Each of the Company and its
Subsidiaries is a corporation duly organized and existing in good standing under
the laws of the jurisdiction in which it is incorporated and has the power to
own its respective property and to carry on its respective business as now being
conducted. Each of the Company and its Subsidiaries is duly qualified as a
foreign corporation to do business and in good standing in every jurisdiction in
which the nature of the respective business conducted or property owned by it
makes such qualification necessary except where the failure so to qualify would
not, individually or in the aggreagate, have or reasonably be expected to have a
Material Adverse Effect.

         2.2. Subsidiaries. Schedule 2.2 sets forth a list of the Subsidiaries.
Except as set forth in Schedule 2.2, the Company is not subject to any
obligation or requirement to provide funds to or make any investment (in the
form of a loan, capital contribution or otherwise) in any entity or enterprise
that is not wholly owned by a Subsidiary. Except as set forth in Schedule 2.2,
the Company owns directly or indirectly each of the outstanding shares of
capital stock (or other ownership interests having by their terms ordinary
voting power to elect a majority of directors or others performing similar
functions with respect to such subsidiary) of each Subsidiary, free and clear of
all liens, pledges, security interests, claims or other encumbrances. Each of
the outstanding shares of capital stock of each Subsidiary is duly authorized,
validly issued, fully paid and nonassessable. All of the capital stock of each
Subsidiary is owned by the Company and/or one or more wholly-owned subsidiaries
of the Company.

         2.3. Capitalization. As of the date hereof, the authorized capital
stock of the Company consists of 20,000,000 shares of Common Stock, of which (i)
8,632,826 shares are validly issued and outstanding, (ii) no shares are issued
and held in treasury, and (iii) 915,190 shares are reserved for issuance upon
exercise of existing Company Options (as defined below). No shares of Common
Stock are held by any Subsidiary. Each outstanding share of Common Stock is duly
authorized, validly issued, fully paid and nonassessable, and has not been
issued in violation of any preemptive or similar rights. Other than as set forth
in Schedule 2.3 and as contemplated by the Option Agreements: (i) there are no
outstanding subscriptions, options, warrants, puts, calls, agreements,
understandings, claims or other commitments of any type relating to the
issuance, sale, repurchase or transfer by the Company of any Common Stock or
other securities of the Company (the "Company Options"), or by the Company or
any Subsidiary of any securities of a Subsidiary, (ii) there are no outstanding
securities which are convertible into or exchangeable for any shares of capital
stock or other securities of the Company or any Subsidiary, and (iii) neither
the Company nor any Subsidiary has any obligation of any kind to issue any
additional shares of capital stock or other securities to pay for or


                                      -4-
<PAGE>   8

repurchase any shares of capital stock or other securities of any Subsidiary or
any predecessor thereof. The Primary Shares being delivered herewith have been
duly authorized, validly issued, fully paid and nonassessable, are being
delivered free and clear of all claims, liens, encumbrances and security
interests, and are eligible for NASDAQ NMS trading without further consents or
actions other than registration with the Securities and Exchange Commission (the
"Commission") thereof pursuant to the Registration Rights Agreement. The shares
of Common Stock which will be issued upon exercise of the Options have been
authorized and reserved for issuance, and when issued and delivered in
accordance with the terms of the applicable Option Agreement, will be validly
issued, fully paid and nonassessable and will be eligible for NASDAQ NMS trading
without further consents or actions other than registration thereof pursuant to
the Registration Rights Agreement.

         2.4. Due Authorization. The execution and delivery of this Agreement,
the Option Agreements and the Registration Rights Agreement and the issuance and
sale of the Primary Shares by the Company, and compliance by the Company with
all the provisions of the foregoing agreements applicable to it: (i) are within
the corporate power and authority of the Company; (ii) do not or will not
require any approval or consent of the stockholders of the Company, other than
approvals and consents which have been duly obtained; and (iii) have been
authorized by all requisite corporate proceedings on the part of the Company.
This Agreement, the Option Agreements and the Registration Rights Agreement have
been duly executed and delivered by the Company and constitute valid and binding
agreements of the Company, enforceable in accordance with their respective
terms. The Company has furnished to Purchaser true and correct copies of the
Company's Articles of Incorporation and bylaws as in effect on the date hereof.

         2.5. Non-contravention; Consents and Approvals. None of (i) the
execution and delivery by the Company of this Agreement, the Registration Rights
Agreement and the Option Agreements, (ii) the issuance of the Primary Shares and
(iii) the fulfillment of and compliance with the terms and provisions hereof, of
the Registration Rights Agreement and of the Option Agreements applicable to the
Company, will:

              (a) conflict with, or result in a breach of any provision of, the
Articles of Incorporation or bylaws of the Company;

              (b) violate, or conflict with, or result in a breach of any
provision of, or constitute a default (or an event which, with the giving of
notice, the passage of time or otherwise, would constitute a default) under, or
entitle any party (with the giving of notice, the passage of time or otherwise)
to terminate, accelerate, modify or call a default under, or result in the
creation of any lien, security interest, charge or encumbrance upon any of the
properties or assets of the Company under, any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, deed of trust, license,
contract,


                                      -5-
<PAGE>   9

undertaking, agreement, lease or other instrument or obligation to which the
Company or any Subsidiary is a party;

              (c) violate any Law applicable to the Company or any Subsidiary or
any of their respective properties or assets; or

              (d) require any action or consent or approval of, or review by, or
registration or filing by the Company or any of its Affiliates with, any third
party (including, without limitation, securities authority or exchange) or any
local, domestic, foreign or multinational court, arbitral tribunal,
administrative agency or commission or other governmental or regulatory body,
agency, instrumentality or authority (a "Governmental Authority"), other than
registrations or other actions required under federal and state securities laws
as are contemplated by the Registration Rights Agreement;

except in the case of (b), (c) and (d), for any of the foregoing that would not,
individually or in the aggregate, have or reasonably be expected to have a
Material Adverse Effect.

         2.6. SEC Reports. The Company has timely filed with the Commission all
forms, reports, schedules, statements and other documents required to be filed
by it (other than the Company's proxy statement in respect of its annual
shareholders' meeting to be held in 1998) since January 1, 1996 under the
Exchange Act or the Securities Act (such documents, as supplemented and amended
since the time of filing, collectively, the "SEC Documents"). The SEC Documents,
including any financial statements or schedules included therein, at the time
filed (and, in the case of registration statements and proxy statements, on the
dates of effectiveness and the dates of mailing, respectively) (a) did not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading, and (b) complied in all material respects with the applicable
requirements of the Exchange Act and the Securities Act, as the case may be. The
financial statements of the Company included in the SEC Documents at the time
filed (and, in the case of registration statements and proxy statements, on the
dates of effectiveness and the dates of mailing, respectively) complied as to
form in all material respects with applicable accounting requirements and with
the published rules and regulations of the Commission with respect thereto, were
prepared in accordance with U.S. generally accepted accounting principles
applied on a consistent basis during the periods involved (except as may be
indicated in the notes thereto or, in the case of unaudited statements, as
permitted by Form 10-Q of the Commission), and fairly present (subject, in the
case of the unaudited interim financial statements, to normal, recurring
year-end audit adjustments consistent with past practice), in all material
respects, the consolidated financial position of the Company and the
Subsidiaries as at the dates thereof and the consolidated results of their
operations and cash flows for the periods then ended. No Subsidiary is subject
to the periodic reporting requirements of the 


                                      -6-
<PAGE>   10

Exchange Act or required to file any form, report or other document with the
Commission, any stock exchange or any other comparable Governmental Authority
(domestic or foreign).

         2.7. Undisclosed Liabilities. The Company and its Subsidiaries have no
liabilities, contingent or otherwise, not reflected in the Company's balance
sheet as of March 31, 1998 included in the SEC Documents or otherwise referred
to in the SEC Documents, or otherwise disclosed to the Purchaser in writing
prior to the date hereof, other than any such liabilities incurred in the
ordinary course of business since March 31, 1998 or incurred in connection
herewith.

         2.8. Taxes. Except as set forth in Schedule 2.8 and except for such
matters that would not, individually or in the aggregate, have or reasonably be
expected to have a Material Adverse Effect:

              (a) The Company and the Subsidiaries (i) have timely filed all Tax
Returns (as defined in Section 2.8(c)) (including, but not limited to, those
filed on a consolidated, combined or unitary basis) required to have been filed
by the Company or the Subsidiaries, all of which Tax Returns are true, correct
and complete; (ii) have within the time and manner prescribed by Law paid all
Taxes (as defined in Section 2.8(c)), required to be paid in respect of the
periods covered by such Tax Returns or otherwise due to any Governmental
Authority; (iii) have established and maintained on their respective books an
records, in accordance with their normal accounting practices and procedures,
accruals and reserves that are adequate for the payment of all Taxes not yet due
and payable and attributable to any period preceding the date hereof; (iv) are
not delinquent in the payment of any Tax; and (v) have not received written
notice of any deficiencies for any Tax from any Governmental Authority against
the Company or any Subsidiary, which deficiency has not been satisfied. Neither
the Company nor any Subsidiary is the subject of any currently ongoing audit or
judicial or administrative proceeding relating to Taxes. With respect to any
taxable period ended prior to December 31, 1993, all federal income Tax Returns
including the Company or any Subsidiary have been audited by the Internal
Revenue Service or are closed by the applicable statute of limitations. There
are no liens with respect to Taxes upon any of the properties or assets, real or
personal, tangible or intangible, of the Company or any Subsidiary (other than
liens for Taxes not yet due). No claim has ever been made in writing by a
Governmental Authority in a jurisdiction where the Company and the Subsidiaries
do not file Tax Returns that the Company or any Subsidiary is or may be subject
to taxation by that jurisdiction. Neither the Company nor any Subsidiary has
filed an election under Section 341(f) of the Code to be treated as a consenting
corporation.

              (b) The Company and its Subsidiaries have withheld or collected
all Taxes required to have been withheld or collected in connection with amounts
paid or owing to any employee, independent contractor, creditor, stockholder or
other third party


                                      -7-
<PAGE>   11

and any such amounts required to be remitted to a Governmental Authority have
been timely remitted, other than Taxes for amounts less than $100,000 in the
aggregate.

              (c) For purposes of this Agreement, (i) "Tax" (and, with
correlative meaning, "Taxes") means any federal, state, local or foreign income,
gross receipts, property, sales, use, value added, license, excise, franchise,
capital, net worth, estimated, withholding, employment, payroll, premium,
withholding, alternative or added minimum, ad valorem, inventory, asset, gains,
transfer or excise tax, or any other tax, levy, custom, duty, impost,
governmental fee or other like assessment or charge of any kind whatsoever,
together with any interest, penalty or additions to tax, imposed by any
Governmental Authority, and (ii) "Tax Return" means any return, report or
similar statement required to be filed with respect to any Tax (including any
attached schedules), including, without limitation, any information return,
claim for refund, amended return or declaration of estimated Tax.

         2.9. Certain Changes. Since March 30, 1998 the Company and its
Subsidiaries have operated their respective businesses only in the ordinary
course and no events have occurred which, individually or in the aggregate, have
or would reasonably be expected to have a Material Adverse Effect, other than
changes disclosed or referred to in the SEC Documents or otherwise disclosed to
the Purchaser in writing prior to the date of this Agreement.

         2.10. Litigation; Compliance with Laws. (a) There is no suit, claim,
action, proceeding, audit or investigation (each, an "Action") pending or, to
the knowledge of the Company, threatened, against the Company or any of its
Subsidiaries or any of their respective properties or assets, which,
individually or in the aggregate (i) questions the validity or enforceability
of, or seeks to enjoin or invalidate this Agreement, the Option Agreements, the
Registration Rights Agreement, the Primary Shares or the Options or any action
taken or to be taken pursuant hereto or thereto, or (ii) has or would reasonably
be expected to have a Material Adverse Effect (other than as set forth in the
SEC Documents or in Schedule 2.10(a)). Neither the Company nor any Subsidiary is
subject to any outstanding judgment, order, writ, injunction, decree or award
which, individually or in the aggregate, has or would reasonably be expected to
have a Material Adverse Effect.

              (b) Except as set forth in the SEC Documents or in Schedule 
2.10(b), and except for environmental matters covered by Section 2.14, the
Company has been and is in compliance with all applicable Laws.

              (c) Neither the Company nor any Subsidiary is: (i) a "public
utility company" or a "holding company," or an "affiliate" or a "subsidiary
company" of a "holding company," or an "affiliate" of such a "subsidiary
company," as such terms are defined in the Public Utility Holding Company Act of
1935, as amended, or (ii) a "public utility," as defined in the Federal Power
Act, as amended, or (iii) an "investment


                                      -8-
<PAGE>   12
company" or an "affiliated person" thereof or an "affiliated person" of any such
"affiliated person," as such terms are defined in the Investment Company Act of
1940, as amended, or (iv) a "United States real property holding corporation" as
defined in section 897(c)(2) of the Code. Stock ownership in the Company is not
a "United States real property interest" as defined in Code section
897(c)(1)(A)(ii).

         2.11. Title to Properties; Insurance. The Company and each of its
Subsidiaries have good and valid title to, or, in the case of property leased by
any of them as lessee, a valid and subsisting leasehold interest in, their
respective properties and assets, free of all liens and encumbrances other than
those referred to in the financial statements of the Company (or the notes
thereto) for the year ended December 31, 1997, included in the SEC Documents,
except in each case for such defects in title and such other liens and
encumbrances which are disclosed in the SEC Documents or which would not have or
reasonably be expected to have a Material Adverse Effect. The Company and its
Subsidiaries maintain insurance in such amounts, including self-insurance,
retainage and deductible arrangements, and of such a character as is reasonable
for companies engaged in the same or similar business. Without limiting the
generality of the foregoing, the Company maintains directors' and officers'
insurance in amounts at least comparable to public companies of its size. All
insurance policies of the Company and its Subsidiaries are disclosed in Schedule
2.11.

         2.12. ERISA. No accumulated funding deficiency (as defined in Section
302 of ERISA and Section 412 of the Code), whether or not waived, exists with
respect to any Pension Plan (other than a Multiemployer Plan (as defined
below)). No liability to the PBGC has been, or is reasonably likely to be,
incurred with respect to any Pension Plan (other than a Multiemployer Plan) by
the Company, any of its Subsidiaries or any ERISA Affiliate (as defined below)
which is or would be materially adverse to the Company, its Subsidiaries and any
ERISA Affiliate. Neither the Company nor any of its Subsidiaries and any ERISA
Affiliate has incurred, or is reasonably likely to incur, any withdrawal
liability under Title IV of ERISA with respect to any Multiemployer Plan which
is or would be materially adverse to the Company, its Subsidiaries and its ERISA
Affiliates and if the Company, its Subsidiaries and ERISA Affiliates, were to
completely withdraw as of the date hereof from each Multiemployer Plan in which
they participate, the Company, its Subsidiaries and its ERISA Affiliates would
not incur any material withdrawal liability under Title IV of ERISA. Neither the
Company nor any of its Subsidiaries has any obligation to provide
post-retirement health benefits to any employee or former employee. No fiduciary
of any employee benefit plan (as defined in Section 3(3) of ERISA) maintained or
contributed to by the Company or any Subsidiary, for the benefit of their
respective employees (each an "Employee Plan") has engaged or caused any
Employee Plan to engage in any transaction prohibited by Section 4975 of the
Code or Section 406 of ERISA which is reasonably likely to subject the Company
or any Subsidiary, or any entity the Company or any Subsidiary has an obligation
to indemnify,


                                      -9-
<PAGE>   13

to any tax or penalty imposed under Section 4975 of the Code or Section 502 of
ERISA. Each Employee Plan has been maintained and administered in compliance
with all applicable law including ERISA and the Code in all material respects.
An "ERISA Affiliate" for purposes of this Section is any trade or business,
whether or not incorporated, which, together with the Company, is under common
control, as described in Section 414(b) or (c) of the Code, and the term
"Multiemployer Plan" shall mean any Pension Plan which is a "multiemployer plan"
(as such term is defined in Section 4001(a)(3) of ERISA).

         2.13. Possession of Franchises, Licenses, Etc. The Company and its
Subsidiaries possess all franchises, certificates, licenses, permits and other
authorizations from governmental or political subdivisions or regulatory
authorities, free from burdensome restrictions, that are necessary in any
material respect to the Company or any of its Subsidiaries for the ownership,
maintenance and operation of their respective properties and assets, and neither
the Company nor any of its Subsidiaries is in violation of anythereof, except as
would not have or reasonably be expected to have a Material Adverse Effect.

         2.14. Environmental and Other Regulations. Except for matters disclosed
in Schedule 2.14 and except for matters that would not, individually or in the
aggregate, have or reasonably be expected to have a Material Adverse Effect, (a)
the properties, operations and activities of the Company and the Subsidiaries
have at all times been for all applicable periods of limitation, and are, in
compliance with all applicable Environmental Laws and Environmental Permits
(each as defined below); (b) the Company and the Subsidiaries and the properties
and operations of the Company and the Subsidiaries are not subject to any
pending or, to the Company's knowledge, threatened Action under any
Environmental Law, including without limitation with respect to any present or
former operations, facilities or subsidiaries; (c) there has been no release of
any Hazardous Materials (as defined below) into the environment by the Company
or any Subsidiary, and there are no Hazardous Materials present at, on, under,
within or which have migrated from, any properties of the Company or any
Subsidiary; (d) there has been no exposure of any person or property to any
Hazardous Materials in connection with the properties, operations and activities
of the Company or any Subsidiary; and (e) neither the Company nor any Subsidiary
(x) has received any written notice that the Company, any Subsidiary or any of
their respective present or former operations, facilities or subsidiaries is or
may be a potentially responsible party or otherwise liable in connection with
any site used for the disposal of or otherwise containing Hazardous Materials,
or (y) has disposed of, arranged for the disposal of, or transported any
Hazardous Materials to any site which is listed on the U.S. Environmental
Protection Agency's National Priorities List or which is otherwise subject to
remediation or investigation. The Company and the Subsidiaries have made
available to Purchaser all material internal and external environmental audits
and reports (in each case relevant to the Company or any


                                      -10-
<PAGE>   14

Subsidiary) prepared since January 1, 1993 and in the possession of the Company
or any Subsidiary. The term "Environmental Laws" means all federal, state, local
or foreign laws relating to pollution or protection of human health or the
environment (including, without limitation, ambient air, surface water,
groundwater, land surface or subsurface strata), including, without limitation,
laws relating to emissions, discharges, releases or threatened releases of
chemicals, pollutants, contaminants, or industrial, toxic or hazardous
substances or wastes (collectively, "Hazardous Materials") into the environment,
or otherwise relating to the manufacture, processing, distribution, use,
treatment, storage, disposal, transport or handling of Hazardous Materials, as
well as all authorizations, codes, decrees, demands or demand letters,
injunctions, judgments, licenses, notices or notice letters, orders, permits,
plans or regulations issued, entered, promulgated or approved thereunder, as in
effect on the date hereof. "Environmental Permit" means any permit, approval,
identification number, license or other authorization required under or issued
pursuant to any applicable Environmental Law.

         2.15. Patents and Trademarks. Set forth in Schedule 2.15 is a true and
complete list of all patents, patent applications, trademarks, service marks,
trademark and servicemark applications, trade names, copyrights and licenses of
any of the foregoing presently used by the Company or any Subsidiary or
necessary for the conduct of the business of the Company and its Subsidiaries as
conducted and as proposed to be conducted (the "Intellectual Property Rights").
The Company owns, or has the right to use under the agreements or upon the terms
described in Schedule 2.15, all of the Intellectual Property Rights. To the
Company's knowledge, the business conducted or proposed to be conducted by the
Company and its Subsidiaries does not infringe or violate any of the patents,
trademarks, service marks, trade names, copyrights, licenses of any of the
foregoing, trade secrets or other proprietary rights of any other person or
entity. Except as set forth in Schedule 2.15, to the Company's knowledge, no
other Person has any right to or interest in any inventions, improvements,
discoveries or other confidential information utilized by the Company or any
Subsidiary in its business.

         2.16. Material Contracts and Obligations. Schedule 2.16 lists all
contracts, agreements, guarantees, leases and executory commitments (each a
"Contract"), other than any Contracts heretofore filed as an exhibit to any SEC
Document, that exist as of the date hereof to which the Company or any
Subsidiary is a party or by which it is bound and which fall within any of the
following categories: (a) Contracts not entered into in the ordinary course of
business other than those that individually or in the aggregate are not material
to the Company's business, (b) joint venture and partnership agreements, (c)
Contracts containing covenants purporting to limit the freedom of the Company to
compete in any line of business in any geographic area, (d) Contracts relating
to any outstanding commitment for capital expenditures in excess of $500,000,
(e) indentures, mortgages, promissory notes, loan agreements or other
Indebtedness in excess of $100,000 in the aggregate, agreements or instruments
or commitments for the borrowing 


                                      -11-
<PAGE>   15

or the lending by the Company or any Subsidiary of amounts in excess of $100,000
in the aggregate or providing for the creation of any charge, security interest,
encumbrance or lien upon any of the assets of the Company and its Subsidiaries
with an aggregate value in excess of $100,000, (f) stock purchase agreements,
asset purchase agreements or other acquisition or divestiture agreements
relating to material transactions since January 1, 1995, (g) Contracts between
the Company or any Subsidiary and any Affiliate, employee, director, officer or
Significant Shareholder, or (h) any agreement which is material to the Company,
irrespective of amount. All Contracts to which the Company or any Subsidiary is
a party or by which it is bound are valid and binding obligations of the Company
or the Subsidiary (as the case may be) and, to the Company's knowledge, the
valid and binding obligation of each other party thereto except such Contracts
which if not so valid and binding would not, individually or in the aggregate,
have or reasonably be expected to have a Material Adverse Effect. Neither the
Company nor any Subsidiary nor, to the Company's knowledge, any other party
thereto is in violation of or in default in respect of, nor has there occurred
an event or condition which with the passage of time or giving of notice (or
both) would constitute a default under or permit the termination of, any such
Contract except such violations or defaults under or terminations which,
individually or in the aggregate, would not have or reasonably be expected to
have a Material Adverse Effect.

         2.17. Brokers. Except as set forth in Schedule 2.17, no agent, broker,
investment banker or other Person is or will be entitled to any broker's fee or
any other commission or similar fee from the Company or any Subsidiary in
connection with any of the transactions contemplated by this Agreement.

         2.18. Accuracy of Information. None of the representations and
warranties of the Company contained herein or the information, documents or
other materials (other than projections) which have been furnished in writing by
the Company or any of its representatives to the Purchaser in connection with
the transactions contemplated by this Agreement contains any material
misstatement of fact, or omits any material fact required to be stated herein or
therein or necessary to make the statements herein and therein not misleading.
All projections furnished in writing by the Company in connection with the
transactions contemplated by this Agreement (i) are bona fide projections of the
Company, (ii) have been prepared by management of the Company after a careful
analysis of all material data, (iii) are based on reasonable assumptions by
management of the Company and (iv) represent the best estimate by management of
the Company, based upon current reasonable assumptions, as to the financial
performance of the Company and the Subsidiaries for the periods indicated, but
do not represent any guarantee or assurance of the future financial results of
the Company and its Subsidiaries.

         2.19. Offering of Primary Shares. Neither the Company nor any Person
acting on its behalf has offered any of the Primary Shares to any Persons in a
manner that could 


                                      -12-
<PAGE>   16

reasonably be expected to subject the offering, issuance or sale of any of the
Primary Shares to the registration requirements of Section 5 of the Securities
Act.

         2.20. Costs of "Year 2000" Modifications. The estimated costs to the
Company and its Subsidiaries of "Year 2000" modifications to their computer
systems and software do not exceed $100,000.

3.       Representations and Warranties of each Purchaser.

         Purchaser represents and warrants as of the date hereof as follows:

         3.1. Organization and Qualification. Purchaser is a limited liability
company duly organized and existing in good standing under the laws of Delaware
and has the power to own its respective property and to carry on its respective
business as now being conducted. Purchaser is duly qualified as a foreign
corporation to do business and in good standing in every jurisdiction in which
the nature of the respective business conducted or property owned by it makes
such qualification necessary, except where the failure to so qualify would not
prevent consummation of the transactions contemplated hereby or have a material
adverse effect on Purchaser's ability to perform its obligations hereunder.

         3.2. Due Authorization. The execution and delivery of this Agreement,
the Option Agreements and the Registration Rights Agreement, and compliance by
Purchaser with all the provisions of the foregoing agreements applicable
to it: (i) are within the corporate power and authority of Purchaser; and (ii)
have been authorized by all requisite corporate proceedings on the part of
Purchaser. This Agreement, the Option Agreements and the Registration Rights
Agreement have been duly executed and delivered by Purchaser and constitutes
valid and binding agreements of Purchaser, enforceable in accordance with their
respective terms.

         3.3. Acquisition for Investment. Purchaser is acquiring the Primary
Shares and the Options for its own account for the purpose of investment and not
with a view to or for sale in connection with any distribution thereof, and
Purchaser has no present intention or plan to effect any distribution thereof.
Purchaser acknowledges that the Primary Shares and the Options (and the shares
underlying the Options) have not been registered under the Securities Act and
may be sold or disposed of in the absence of such registration only pursuant to
an exemption from such registration.

         3.4. Brokers. No agent, broker, investment banker or other Person is or
will be entitled to any broker's fee or any other commission or similar fee from
Purchaser in connection with any of the transactions contemplated by this
Agreement.

         3.5. Non-contravention; Consents and Approvals. None of (i) the
execution and delivery by Purchaser of this Agreement, the Registration Rights
Agreement and the 


                                      -13-
<PAGE>   17

Option Agreements, and (ii) the fulfillment of and compliance by Purchaser with
the terms and provisions hereof, of the Registration Rights Agreement and of the
Option Agreements applicable to Purchaser, will:

              (a) conflict with, or result in a breach of any provision of, the
Certificate of Formation or other organizational documents of Purchaser; or

              (b) violate, or conflict with, or result in a breach of any
provision of, or constitute a default (or an event which, with the giving of
notice, the passage of time or otherwise, would constitute a default) under, or
entitle any party (with the giving of notice, the passage of time or otherwise)
to terminate, accelerate, modify or call a default under, or result in the
creation of any lien, security interest, charge or encumbrance upon any of the
properties or assets of Purchaser under, any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, deed of trust, license,
contract, undertaking, agreement, lease or other instrument or obligation to
which Purchaser is a party, except in the case of this clause (b), for any of
the foregoing that would not, individually or in the aggregate, have or
reasonably be expected to have a material adverse effect on Purchaser's ability
to perform its obligations hereunder.

         3.6. Accredited Investor. Purchaser is an "accredited investor" within
the meaning of Rule 501 of the Securities Act.

4.       Covenants of the Company. 

         4.1. Negative Covenants. From the date hereof and as long as Purchaser
and its Affiliates either (i) Beneficially Own 10% or more of the outstanding
Common Stock of the Company, or (ii) have not transferred to Third Parties 50%
or more of the Primary Shares, the Company shall not, and shall cause its
Subsidiaries not to do any of the following things without the prior written
consent of Purchaser:

              (a) incur or, from and after the fifth day following the date
hereof, maintain any Indebtedness other than (i) bank lines of credit for
working capital not in excess of U.S.$27 million (in the aggregate for the
Company and its Subsidiaries), (ii) Capital Leases not in amounts in excess of
U.S.$2 million (in the aggregate for the Company and its Subsidiaries), and
(iii) other items of Indebtedness not in excess of $1,000,000 (provided,
however, that the Company shall be permitted to maintain other items of
Indebtedness existing on the date hereof in amounts not in excess of U.S.$16
million); and, at any time, allow the aggregate amount of the Indebtedness to be
greater than U.S.$42 million;

              (b) incur liens or encumbrances other than liens to secure the
indebtedness permitted by Section 4.1(a) and other than Permitted Liens;


                                      -14-
<PAGE>   18

         (c) incur contingent obligations or guaranties other than in the
ordinary course of business;

         (d) enter into a line of business that is different (in a material
respect) from the businesses currently conducted by the Company or its
Subsidiaries or conduct any material business activities that are not either
currently conducted or directly related to those currently conducted by the
Company or its Subsidiaries;

         (e) enter into any Contract or amend any existing Contract with a value
in excess of 5% of total assets (as set forth on the immediately preceding
year's audited financial statements) or enter any Contract or transaction or
amend any existing Contract or transaction with any Affiliate or Significant
Shareholder;

         (f) incur amounts for any capital expenditure in excess of 110% of the
amount budgeted for such capital expenditure on the budgets previously delivered
to Purchaser, provided, however, that the Company may reallocate up to 20% of
the aggregate amount of the capital expenditure budget per year among capital
expenditure items listed in such budget or to other capital expenditure items;

         (g) approve increases in any item in each year's annual budget in
excess of 5% over the amount budgeted for such item during the preceding year;

         (h) appoint or remove any executive officer of the Company;

         (i) amend the Articles of Incorporation or the bylaws of the Company or
any Subsidiary, or adopt any rights agreement, plan or other instrument (e.g. a
so-called "poison pill");

         (j) acquire assets (other than in the ordinary course of business) or
common stock, debt or other securities of any Third Party in excess of $100,000
in the aggregate;

         (k) in any year, sell or dispose of assets of the Company or any
Subsidiary having a value in excess of 10% of the value of the total fixed
assets of the Company and its Subsidiaries (as set forth in the Company's
consolidated audited balance sheet at the end of the prior fiscal year) other
than the proposed sale of the Company's Hidalgo warehouse facility;

         (l) in any year, sell or dispose of assets of any facility of the
Company having a value in excess of 5% of the value of such facility's total
fixed assets (as set forth in the Company's consolidated audited balance sheet
at the end of the prior fiscal year);


                                      -15-
<PAGE>   19

              (m) make or maintain any investment in or capital contribution or
advance to any other Person, other than investments in wholly-owned
subsidiaries; or enter into joint ventures or partnerships or establish
non-wholly owned subsidiaries, except, in each case, for investments,
contributions or arrangements described in Schedule 4.1;

              (n) in any transaction or series of transactions, acquire
(including pursuant to a merger or consolidation) all or any substantial portion
of the business or assets of any Person, except for transactions not in excess
(in the aggregate) of $100,000;

              (o) dissolve or liquidate the Company;

              (p) issue any securities of the Company or any Subsidiary
(including, without limitation, common stock, convertible securities, rights,
warrants or options to one or more Persons (including through a public
offering)), other than pursuant to an employee benefit plan or director stock
option plan consistent with past practice and other than the exercise of Company
Options;

              (q) register Common Stock or other securities of the Company or
any Subsidiary under the Securities Act (except as provided in registration
rights agreements existing on the date hereof and disclosed to Purchaser or
subsequently entered into with the consent of Purchaser or pursuant to a
registration statement on Form S-8 in connection with the employee stock option
plan or the director stock option plan) or grant any registration rights;

              (r) effect any debt or equity repurchase or redemption or other
restricted payment, other than payment of debt in the ordinary course of
business;

              (s) change the Company's independent certified public accountants;

              (t) adopt or amend, in any material respect, any employee benefit
plan; and

              (u) settle any material Action.

         4.2. Board Representation. (a) Within 10 days of the date hereof, the
Company shall take all necessary action to cause the Purchaser Designees (as
defined below) to be elected to the Board of Directors of the Company. In
connection with the 1998 Annual Meeting of Shareholders, the Company shall take
all necessary action to cause the Purchaser Designees to be nominated and shall
use its best efforts to cause such Purchaser Designees to be


                                      -16-
<PAGE>   20

elected to the Board of Directors of the Company. Thereafter, in connection with
any annual meeting of shareholders at which the term of a Purchaser Designee is
to expire, the Company will take all necessary action to cause a Purchaser
Designee to be nominated and use its best efforts to cause such Purchaser
Designee to be elected to the Board of Directors of the Company. In the event of
any vacancy arising by reason of the resignation, death, removal, or inability
to serve of any of the Purchaser Designees, Purchaser shall be entitled to
designate a successor to fill such vacancy for the unexpired term. If any
Purchaser Designee is not elected at an annual meeting of shareholders,
Purchaser shall be entitled to designate an alternative Person and the Company
shall, within 10 days of such designation, take all necessary action to cause
such alternative Person to be elected to the Board of Directors of the Company.
"Purchaser Designees" shall mean those individuals designated from time to time
by Purchaser to serve on the Company's Board of Directors. The number of
Purchaser Designees shall be the smallest number possible such that the ratio of
Purchaser Designees to total number of directors (after election of the
Purchaser Designees) is at any time greater than or equal to the ratio of the
number of Primary Shares held by Purchaser and its Affiliates to total number of
shares of Common Stock outstanding (e.g. if there are 7 directors without the
Purchaser Designees and Purchaser and its Affiliates own 27% of the Common Stock
outstanding, then the number of Purchaser Designees will be three, resulting in
a total of 10 directors).

              (b) The Company shall maintain directors' and officers' insurance
in at least the amount currently maintained by the Company. The Company shall
indemnify Purchaser and the current and former Purchaser Designees (in
connection with serving on the Company's Board of Directors) to the fullest
extent permitted by Law and, upon request, the Company shall enter into an
indemnification agreement with any such Purchaser Designee reasonably acceptable
to such Purchaser Designee. The Purchaser Designees shall be entitled to
reimbursement of expenses to the same extent that other non-employee directors
of the Company are entitled to such reimbursement.

         4.3. Compliance with Laws. From the date hereof and as long as
Purchaser and its Affiliates own any Primary Shares, the Company shall, and
shall cause the Subsidiaries to, comply with all applicable Laws, including
without limitation, financial and other reporting requirements pursuant to the
Exchange Act.

         4.4. Insurance. From the date hereof and as long as Purchaser and its
Affiliates own any Primary Shares, the Company shall, and shall cause the
Subsidiaries to, maintain insurance in such amounts, including self-insurance,
retainage and deductible arrangements, and of such a character as is reasonable
for companies engaged in the same or similar business.

         4.5. Preservation of Existence, Franchises. From the date hereof and as
long as Purchaser and its Affiliates own any Primary Shares, the Company shall,
and shall cause the Subsidiaries to, maintain their respective corporate
existence, rights and franchises in full force and effect, provided that nothing
in this Section 4.5 shall prevent the Company or any Subsidiary from
discontinuing its operations in any particular state or at any particular
location or locations within the state, or prevent the corporate existence,
rights 


                                      -17-
<PAGE>   21

and franchises of any Subsidiary from being terminated if, in the opinion
of the Board of Directors of the Company, the preservation thereof is no longer
desirable in the conduct of the business of the Company and its Subsidiaries
taken as a whole.

         4.6. Payment of Taxes and Other Charges. The Company shall pay or
discharge, and shall cause each of the Subsidiaries to pay or discharge, before
the same become delinquent, (i) all Taxes, assessments and other governmental
charges or levies imposed upon it or any of its properties or income (including,
without limitation, such as may arise under Section 4062, 4063, or 4064 of ERISA
or any similar provision of law), and (ii) all claims or demands of materialmen,
mechanics, carriers, warehousemen, landlords and other like Persons which, in
the case of either clause (i) or clause (ii), if unpaid, might result in the
creation of a material lien upon any of its properties, provided, however, that
the Company shall not be required to pay or discharge or cause to be paid or
discharged any such Tax, assessment, charge or claim whose amount, applicability
or validity is being contested in good faith pursuant to appropriate proceedings
and for which adequate accruals and reserves for the payment thereof have been
established and maintained on the books and records of the Company or such
Subsidiary.

         4.7. Reports; Access. From the date hereof and as long as Purchaser and
its Affiliates either (i) Beneficially Own 5% or more of the outstanding Common
Stock of the Company, or (ii) have not transferred to Third Parties 75% or more
of the Primary Shares, the Company shall:

              (a) as soon as practicable and in any event within 45 days after
the end of each quarterly period (other than the last quarterly period) in each
fiscal year, furnish to Purchaser statements of consolidated net income and cash
flows and a statement of changes in consolidated stockholders' equity of the
Company and its Subsidiaries for the period from the beginning of the then
current fiscal year to the end of such quarterly period, and a consolidated
balance sheet of the Company and its Subsidiaries as of the end of such
quarterly period, setting forth in each case in comparative form figures for the
corresponding period or date in the preceding fiscal year, all in reasonable
detail and certified by an authorized financial officer of the Company, subject
to changes resulting from year-end adjustments; provided, however, that delivery
pursuant to Section 4.7(c) of a copy of the Quarterly Report on Form 10-Q of the
Company for such quarterly period filed with the Commission shall be deemed to
satisfy the requirements of this clause;

              (b) as soon as practicable and in any event within 90 days after
the end of each fiscal year, furnish to Purchaser statements of consolidated net
income and cash flows and a statement of changes in consolidated stockholders'
equity of the Company and its Subsidiaries for such year, and a consolidated
balance sheet of the Company and its Subsidiaries as of the end of such year,
setting forth in each case in comparative form the corresponding figures from
the preceding fiscal year, all in reasonable detail and examined and reported on
by independent public accountants of recognized national 


                                      -18-
<PAGE>   22

standing selected by the Company; provided, however, that delivery pursuant to
Section 4.7(c) below of a copy of the Annual Report on Form 10-K of the Company
for such fiscal year filed with the Commission shall be deemed to satisfy the
requirements of this Section 4.7(b);

              (c) promptly upon transmission thereof, furnish to Purchaser
copies of all registration statements and all other filings or reports the
Company files with the Commission; and

              (d) upon the good faith request by Purchaser for such information
from, or access to, the Company and its properties, books, records and personnel
as is reasonable, the Company shall cooperate in promptly providing such
information or access to Purchaser.

         4.8. Dividends. From the date hereof and as long as Purchaser and its
Affiliates either (i) Beneficially Own 5% or more of the outstanding Common
Stock of the Company, or (ii) have not transferred to Third Parties 75% or more
of the Primary Shares, the Company shall not, without the prior written consent
of Purchaser, effect any stock repurchases, pay dividends or make other
distributions in respect of the Common Stock.

         4.9. Limitation on Agreements. From the date hereof and as long as
Purchaser and its Affiliates own any Primary Shares, the Company will not, and
will not permit any Subsidiary to, enter into any Contract, or any amendment,
modification, extension or supplement to any existing Contract, which
contractually conflicts with any provision contained herein.

         4.10. Merger. From the date hereof and as long as Purchaser and its
Affiliates either (i) Beneficially Own 10% or more of the outstanding Common
Stock of the Company, or (ii) have not transferred to Third Parties 50% or more
of the Primary Shares, the Company shall not, and shall cause its Subsidiaries
not to, without the prior written consent of Purchaser, merge with or into or
consolidate with any other Person (unless the Company is the continuing or
surviving entity, such transaction would not violate the provisions of Section
4.1, and immediately after the consummation of such transaction the surviving
corporation would not be in violation of the provisions of Section 4.1) or
otherwise effect a Change in Control.

         4.11. Notice of Breach. As promptly as practicable, and in any event
not later than ten days after senior management of the Company becomes aware of
any breach by the Company of any provision of this Agreement, including, without
limitation, this Article 4, the Company shall provide Purchaser with written
notice specifying the nature of such breach and any actions proposed to be taken
by the Company to cure such breach.


                                      -19-
<PAGE>   23

         4.12. Real Property Holding Company. (a) From the date hereof and as
long as Purchaser and its Affiliates own any Primary Shares or shares of Common
Stock acquired by exercise of one or both of the Options, the Company shall not
become a "United States real property holding corporation" as defined in Code
section 897(c)(2).

              (b) The Company shall, at Purchaser's request, (i) provide
promptly a letter in the form set forth in Exhibit B (with any modifications
thereto as requested by Purchaser to comply with then existing requirements of
the Code and Treasury Regulations thereunder), and comply promptly with the
notice requirements of Treasury Regulations section 1.897-2(h)(2) or (h)(4) (and
any successors thereto), and (ii) provide the voluntary notice to the U.S.
Internal Revenue Service described in Treasury Regulations section
1.897-2(h)(4)(i).

5.       Restrictions on Transfer. Neither Purchaser nor any of its Affiliates
will, directly or indirectly, sell, transfer, pledge, encumber or otherwise
dispose of (collectively, a "Transfer") any of the Primary Shares for one year
from the date hereof, except for Transfers to or between Affiliates who agree to
be bound by the provisions of this Agreement. Neither Purchaser nor any of its
Affiliates will at any time Transfer any of the Primary Shares in violation of
the Securities Act or any applicable state securities laws.

6. Indemnification.

         6.1. Survival. The representations and warranties made in this
Agreement or in documents delivered in connection herewith shall survive the
Closing for 18 months from the date hereof (such 18-month period being the
"Indemnification Period") and on the 18 month anniversary of the date hereof
shall expire, together with any right to indemnification for breach thereof
except to the extent a Valid Third Party Claim Notice (as defined in Section
6.3(a)) or Valid Other Claim Notice (as defined in Section 6.3(b)) (each, a
"Valid Claim Notice") shall have been given with respect to such representation
or warranty prior to the expiration of the applicable Indemnification Period in
accordance with Section 6.3 by the party seeking indemnification (the
"Indemnitee") to the party from which indemnification is being sought (the
"Indemnitor"), in which case the representation or warranty alleged in the Valid
Claim Notice to have been breached shall survive, to the extent of the claim set
forth in the Valid Claim Notice only, until such claim is resolved.
Notwithstanding the preceding sentence, the representations and warranties
contained in Section 2.3 shall not expire and the corresponding Indemnification
Period shall be perpetual, without expiration. The covenants and agreements
contained herein (other than the covenant and agreement to indemnify against
breaches of representations and warranties, which shall expire as set forth in
the first and second sentences of this Section 6.1) shall survive the Closing
until the covenants and agreements are complied with in accordance with their
terms.


                                      -20-
<PAGE>   24
         6.2. Indemnification. (a) Subject to the provisions of this Article 6,
the Company shall defend and indemnify Purchaser, its Affiliates, their
directors and officers and the Purchaser Designees and hold each of them
harmless from and against all damages, claims, losses, Taxes, charges, actions,
suits, proceedings, deficiencies, interest, penalties, fines, liabilities,
obligations, amounts paid in settlements, costs and expenses (including
reasonable attorneys' fees) (collectively, "Losses") which are sustained,
incurred or suffered by any of them (i) by reason of the breach of any of the
representations or warranties made by the Company herein or in any document
delivered in connection herewith, (ii) by reason of the breach of any of the
Company's covenants and agreements contained herein or in any document delivered
in connection herewith, or (iii) for Losses in connection with any Action
arising out of the transactions contemplated hereby (other than Actions arising
out of a breach by Purchaser or its Affiliates of the this Agreement or the
documents delivered in connection herewith); provided, however, that Purchaser,
its Affiliates, their directors and officer and the Purchaser Designees shall
not be entitled to any recovery unless a claim for indemnification is made in
accordance with Section 6.3, so as to constitute a Valid Claim Notice, and
within the time period of survival set forth in Section 6.1.

              (b) Subject to the provisions of this Article 6, Purchaser shall
defend and indemnify the Company and its Affiliates and hold each of them
harmless from and against all Losses which are incurred or suffered by any of
them (i) by reason of the breach by Purchaser of any of the representations or
warranties made by it herein or in any document delivered in connection
herewith, or (ii) by reason of the breach of any of its covenants and agreements
contained herein or in any document delivered in connection herewith; provided,
however, that the Company and its Affiliates shall not be entitled to any
recovery unless a claim for indemnification is made in accordance with Section
6.3, so as to constitute a Valid Claim Notice, and within the time period of
survival set forth in Section 6.1.

         6.3 Procedures for Claims. (a) (i) In order for an Indemnitee to be
entitled to any remedy provided for under this Article 6 in respect of, arising
out of or involving a claim made by any Third Party against the Indemnitee or an
Affiliate (a "Third Party Claim"), the Indemnitee must notify the Indemnitor in
writing of the Third Party Claim (a "Third Party Claim Notice") promptly
following receipt by such Indemnitee of written or oral notice of the Third
Party Claim, which notification, to be a valid Third Party Claim Notice (a
"Valid Third Party Claim Notice"), must be accompanied by a copy of the written
notice, if any, of the Third Party claimant to the Indemnitee asserting the
Third Party Claim, or, if such Third Party Claim shall not have been made in
writing, the written notice of Indemnitee certifying as to the receipt by
Indemnitee of the oral Third Party Claim, and, in each case, setting forth in
reasonable detail, the facts then known by Indemnitee with respect to such Third
Party Claim; provided, however, that the failure to provide such Notice promptly
(so long as a Valid Third Party Claim Notice is given 


                                      -21-
<PAGE>   25

before the expiration of the Indemnification Period and any extensions thereof,
as applicable) shall not affect the obligations of the Indemnitor hereunder
except to the extent the Indemnitor is actually prejudiced thereby. The
Indemnitee shall deliver to the Indemnitor copies of all other notices and
documents (including court papers) received by the Indemnitee relating to the
Third Party Claim.

         (ii) The Indemnitor shall have the right to defend against any such
Third Party Claim (including the conduct of any proceedings or settlement
negotiations, provided that the Indemnitor shall not settle any Third Party
Claim without the Indemnitee's consent, which consent shall not be unreasonably
withheld or delayed) with counsel of the Indemnitor's own choosing. The
Indemnitee shall have the right to participate in the defense of any Third Party
Claim and to employ its own counsel (it being understood that the Indemnitor
shall control such defense), at the Indemnitee's own expense. Prior to the time
the Indemnitee is notified by the Indemnitor as to whether the Indemnitor will
assume the defense of a Third Party Claim, the Indemnitee shall take all actions
reasonably necessary to timely preserve the collective rights of the parties
with respect to such Third Party Claim, including responding timely to legal
process. If the Indemnitor shall decline to assume the defense of a Third Party
Claim (or shall fail to notify the Indemnitee of its election to defend such
Third Party Claim) within 30 days after the giving by the Indemnitee to the
Indemnitor of a Valid Third Party Claim Notice with respect to the Third Party
Claim, the Indemnitee shall defend against the Third Party Claim and the
Indemnitor shall be liable to the Indemnitee for all reasonable fees and
expenses incurred by the Indemnitee in the defense of the Third Party Claim,
including the reasonable fees and expenses of counsel employed by the
Indemnitee, if and to the extent that the Indemnitor is responsible to indemnify
for such Third Party Claim. Regardless of which party assumes the defense of a
Third Party Claim, the parties agree to cooperate with one another in connection
therewith. Such cooperation shall include providing records and information
which are relevant to such Third Party Claim, and which are not required by law
to be kept confidential and making employees and officers available on a
mutually convenient basis to provide additional information and explanation of
any material provided hereunder and to act as a witness or respond to legal
process. Whether or not the Indemnitor assumes the defense of a Third Party
Claim, the Indemnitee shall not admit any liability with respect to, or settle,
compromise or discharge, such Third Party Claim without the Indemnitor's prior
written consent (which consent will not be unreasonably withheld or delayed).

         (b) In order for an Indemnitee to be entitled to any indemnification
provided for under this Article 6 in respect of a claim as to which a Third
Party Claim has not been asserted against such Indemnitee (an "Other Claim"),
the Indemnitee must promptly notify the Indemnitor in writing of such Other
Claim (the "Other Claim Notice"), which notification, to be a valid Other Claim
Notice (a "Valid Other Claim Notice"), must certify that the Indemnitee has in
good faith already sustained some 


                                      -22-
<PAGE>   26

(though not necessarily all) Losses, or has a good faith basis to believe Losses
may be sustained, with respect to such claim. The failure by any Indemnitee to
notify the Indemnitor promptly (so long as a Valid Other Claim Notice is given
before the expiration of the Indemnification Period) shall not relieve the
Indemnitor from any liability that it may have to such Indemnitee under Section
6.2, except to the extent that the Indemnitor has been actually prejudiced by
such failure.

         6.4. Certain Provisions Regarding Indemnification. (a) The
indemnification provided in this Article 6 shall be the sole and exclusive
remedy for any inaccuracy or breach of any representation or warranty made by
the Company or Purchaser in this Agreement.

              (b) Upon making any payment to an Indemnitee for any
indemnification claim pursuant to this Article 6, the Indemnitor shall be
subrogated, to the extent of such payment, to any rights which the Indemnitee
may have against any other parties with respect to the subject matter underlying
such indemnification claim.

              (c) The amount of any Losses shall be computed net of any
insurance proceeds received by the Indemnitee or its Affiliates in connection
therewith.

              (d) The amount of any indemnification payment made by the Company
to Purchaser pursuant hereto shall be increased by dividing (x) the amount that
would be payable (but for this Section 6.4(d)), by (y) one minus the Ownership
Fraction. The "Ownership Fraction" means the number of Primary Shares held by
Purchaser and its Affiliates at the time of such payment, divided by the total
number of shares of Common Stock outstanding at the time of such payment.

              (e) For purposes of this Article 6, Promecap, S.C. shall be deemed
to be an Affiliate of Purchaser (irrespective of whether or not Promecap, S.C.
is from time to time determined to be an Affiliate pursuant to the definition of
Affiliate contained in Section 7.1).

              (f) Notwithstanding any provision of this Article 6 to the
contrary, (A) the Company shall not be obliged to make any payments in respect
of indemnification for a breach described in clause (i) of Section 6.2(a) until
the aggregate amount of payments that the Company is obliged to pay in respect
of such breaches (without reference to this Section 6.4(f)) is at least
$250,000, at which point all payments that the Company is obliged to pay in
respect of such breaches shall be payable, and (B) the Company shall not be
obliged to make any payments in respect of indemnification for breaches of
representations and warranties described in clause (i) of Section 6.2(a) in
excess of $16,500,000.


                                      -23-
<PAGE>   27

7. Interpretation .

   7.1.  Definitions.

         "Affiliate" shall mean, with respect to any Person, any other Person
which, directly or indirectly, is in control of, is controlled by, or is under
common control with, such Person.

         "Beneficially Own", with respect to any securities, shall mean having
"beneficial ownership" of such securities (as determined pursuant to Rule 13d-3
under the Exchange Act), including pursuant to any agreement, arrangement or
understanding, whether or not in writing.

         "Capitalized Lease" shall mean, with respect to any Person, any lease
or any other agreement for the use of property which, in accordance with
generally accepted accounting principles, should be capitalized on the lessee's
or user's balance sheet.

         "Change in Control" shall mean:

               (a) the acquisition by any individual, entity or group (within
     the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) of
     Beneficial Ownership of more than 25% of the combined voting power of the
     then outstanding voting securities of the Company entitled to vote
     generally in the election of directors, but excluding, for this purpose,
     any such acquisition by (i) the Company or any of its Subsidiaries, (ii)
     any employee benefit plan (or related trust) of the Company or its
     Subsidiaries, or (iii) any corporation with respect to which, following
     such acquisition, a majority of the combined voting power of the then
     outstanding voting securities of such corporation entitled to vote
     generally in the election of directors is then Beneficially Owned, directly
     or indirectly, by individuals and entities who were the Beneficial Owners
     of voting securities of the Company immediately prior to such acquisition
     in substantially the same proportion as their ownership, immediately prior
     to such acquisition, of the combined voting power of the then outstanding
     voting securities of the Company entitled to vote generally in the election
     of directors; or

               (b) a reorganization, merger or consolidation, in each case, with
     respect to which all or substantially all the individuals and entities who
     were the respective Beneficial Owners of the voting securities of the
     Company immediately prior to such reorganization, merger or consolidation
     do not, following such reorganization, merger or consolidation Beneficially
     Own, directly or indirectly, more than 75% of the combined voting power of
     the then outstanding voting


                                      -24-
<PAGE>   28

     securities entitled to vote generally in the election of directors of the
     corporation resulting from such reorganization, merger or consolidation; or

               (c) the sale or other disposition of a majority or more of the
     consolidated assets or property of the Company and its Subsidiaries in one
     transaction or series of related transactions.

         "Code" shall mean the Internal Revenue Code of 1986, as amended.

         "ERISA" shall mean the Employee Retirement Income Security Act of 1974,
as amended.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, or any successor federal statute, and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time. Reference
to a particular section of the Exchange Act shall include reference to the
comparable section, if any, of any such successor federal statute.

         "Guarantee" by any Person shall mean all obligations (other than
endorsements in the ordinary course of business of negotiable instruments for
deposit or collection) of any Person guaranteeing, or in effect guaranteeing,
any Indebtedness, dividend or other obligation of any other Person (the "primary
obligor") in any manner, whether directly or indirectly, including, without
limitation, all obligations incurred through an agreement, contingent or
otherwise, by such Person: (i) to purchase such Indebtedness or obligation or
any property or assets constituting security therefor, (ii) to advance or supply
funds (x) for the purchase or payment of such Indebtedness or obligation, (y) to
maintain working capital or other balance sheet condition or otherwise to
advance or make available funds for the purchase or payment of such Indebtedness
or obligation, (iii) to lease property or to purchase securities or other
property or services primarily for the purpose of assuring the owner of such
Indebtedness or obligation of the ability of the primary obligor to make payment
of such Indebtedness or obligation, or (iv) otherwise to assure the owner of the
Indebtedness or obligation of the primary obligor against loss in respect
thereof. For the purposes of any computations made under this Agreement, a
Guarantee in respect of any Indebtedness for borrowed money shall be deemed to
be Indebtedness equal to the outstanding amount of the Indebtedness for borrowed
money which has been guaranteed, and a Guarantee in respect of any other
obligation or liability or any dividend shall be deemed to be Indebtedness equal
to the maximum aggregate amount of such obligation, liability or dividend.

         "Indebtedness" shall mean, with respect to any Person, (i) all
obligations of such Person for borrowed money, or with respect to deposits or
advances of any kind, (ii) all obligations of such Person evidenced by bonds,
debentures, notes or similar instruments, (iii) all obligations of such Person
under conditional sale or other title



                                      -25-
<PAGE>   29

retention agreements relating to property purchased by such Person, (iv) all
obligations of such Person issued or assumed as the deferred purchase price of
property or services (other than accounts payable to suppliers and similar
accrued liabilities incurred in the ordinary course of business and paid in a
manner consistent with industry practice), (v) all Indebtedness of others
secured by (or for which the holder of such Indebtedness has an existing right,
contingent or otherwise, to be secured by) any lien or security interest on
property owned or acquired by such Person whether or not the obligations secured
thereby have been assumed, (vi) all Capitalized Lease obligations of such
Person, (vii) all Guarantees of such Person, (viii) all obligations (including
but not limited to reimbursement obligations) relating to the issuance of
letters of credit for the account of such Person, (ix) all obligations arising
out of foreign exchange contracts, and (x) all obligations arising out of
interest rate and currency swap agreements, cap, floor and collar agreements,
interest rate insurance, currency spot and forward contracts and other
agreements or arrangements designed to provide protection against fluctuations
in interest or currency exchange rates.

         "Law" shall mean any law, statute, rule, regulation, judgment,
injunction, order, decree, license, permit, certificate, or other restriction of
any Governmental Authority or securities authority or exchange applicable to the
Company.

         "Material Adverse Effect" shall mean a material adverse effect on the
business, operations, results of operations, assets, prospects or condition
(financial or otherwise) of the Company or the Fruit Processing Operations or
the Juice and Oil Operations.

         "PBGC" shall mean the Pension Benefit Guaranty Corporation, or any
successor thereto.

         "Pension Plan" shall mean any multiemployer plan or single employer
plan, as defined in Section 4001 of ERISA, that is subject to Title IV of ERISA,
that the Company, any Subsidiary or any ERISA Affiliate maintains or is or ever
has been obligated to contribute to for the benefit of employees or former
employees of the Company, any Subsidiary or any ERISA Affiliate.

         "Permitted Liens" shall mean liens or other encumbrances for current
Taxes not yet due and payable, or for mechanics', carriers', workers' and other
similar liens or encumbrances arising in the ordinary course of business
consistent with past practice, except for such liens or encumbrances that,
individually or in the aggregate, have or would reasonably be expected to have a
Material Adverse Effect.

         "Person" shall mean any individual, firm, corporation, partnership or
other entity, and shall include any successor (by merger or otherwise) of such
entity.


                                      -26-
<PAGE>   30

         "Securities Act" shall mean the Securities Act of 1933, as amended, or
any successor federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time. Reference to a
particular section of the Securities Act shall include reference to the
comparable section, if any, of any such successor federal statute.

         "Significant Shareholder" shall mean any individual, entity or group
(within the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act) that
Beneficially Owns 5% or more of the Common Stock).

         "Subsidiary" shall mean any corporation or other entity of which 25% or
more of the voting power or equity interest is owned, directly or indirectly, by
the Company.

         "Third Party" shall mean, with respect to any Person, any other Person
which is not an Affiliate of such Person.

         "Treasury Regulations" shall mean the regulations promulgated under the
Code from time to time.

   7.2.  Index to Defined Terms. The terms listed below are defined elsewhere in
this Agreement and, for ease of reference, the Section containing the definition
of each such term is set forth opposite such term:

<TABLE>
<S>                                                                        <C>
Action.....................................................................2.10(a)
Affiliate..................................................................7.1
Agreement..................................................................Preamble
Beneficially Own...........................................................7.1
Capital Lease..............................................................7.1
Change in Control..........................................................7.1
Closing....................................................................1.3
Code.......................................................................7.1
Commission.................................................................2.3
Common Stock...............................................................Recitals
Company....................................................................Preamble
Company Options............................................................2.3
Contract...................................................................2.16
Employee Plan..............................................................2.12
Environmental Law..........................................................2.14
Environmental Permit.......................................................2.14
ERISA......................................................................7.1
ERISA Affiliate............................................................2.12
Exchange Act...............................................................7.1
</TABLE>


                                      -27-
<PAGE>   31

<TABLE>
<S>                                                                        <C>
Governmental Authority.....................................................2.5(d)
Guarantee..................................................................7.1
Hazardous Materials........................................................2.14
Indebtedness...............................................................7.1
Indemnification Period.....................................................6.1
Indemnitee.................................................................6.1
Indemnitor.................................................................6.1
Intellectual Property Rights...............................................2.15
Law........................................................................7.1
Letter Agreement...........................................................Recitals
Litigation.................................................................8.11
Losses.....................................................................6.2(a)
Material Adverse Effect....................................................7.1
Multiemployer Plan.........................................................2.12
Options....................................................................Recitals
Option Agreements..........................................................Recitals
Other Claim................................................................6.3(b)
Other Claim Notice.........................................................6.3(b)
Ownership Fraction.........................................................6.4(d)
PBGC.......................................................................7.1
Pension Plan...............................................................7.1
Person.....................................................................7.1
Primary Shares.............................................................Recitals
Purchase Price.............................................................1.2
Purchaser..................................................................Preamble
Purchaser Designee.........................................................4.2(a)
Registration Rights Agreement..............................................Recitals
SEC Documents..............................................................2.6
Securities Act.............................................................7.1
Significant Shareholder ...................................................7.1
Subsidiary.................................................................7.1
Tax........................................................................2.8(c)
Tax Returns................................................................2.8(c)
Third Party................................................................7.1
Third Party Claim..........................................................6.3(a)
Third Party Claim Notice...................................................6.3(a)
Transfer...................................................................5
Treasury Regulations ......................................................7.1
Valid Claim Notice.........................................................6.1
Valid Other Claim Notice...................................................6.3(b)
Valid Third Party Claim Notice.............................................6.3(a)
</TABLE>


                                      -28-
<PAGE>   32

         7.3. Headings; Other Interpretation. The heading references herein and
the table of contents hereto are for convenience purposes only, do not
constitute a part of this Agreement and shall not be deemed to limit or affect
any of the provisions hereof. "Hereby," "hereof," "hereunder" and similar terms
shall be references to this Agreement, including the Schedules hereto. In this
Agreement, unless the context otherwise requires, words in the singular number
or in the plural number shall each include the singular number and the plural
number. As used herein, to a party's "knowledge" means actual knowledge of the
senior management and board of directors of the Company and the knowledge that
any of the foregoing persons would have after due and reasonable inquiry. Unless
the context otherwise indicates, references to a Section, Article or Schedule
shall refer (respectively) to a Section of, Article of or Schedule to this
Agreement. The term "dollars" or "$" shall refer to the currency of the United
States.

8.       Miscellaneous.

         8.1. Severability. If any term, provision, covenant or restriction of
this Agreement or any exhibit hereto is held by a court of competent
jurisdiction to be invalid, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions of this Agreement and such exhibits shall
remain in full force and effect and shall in no way be affected, impaired or
invalidated. It is hereby stipulated and declared to be the intention of the
parties that they would have executed the remaining terms, provisions, covenants
and restrictions without including any of such which may be hereafter declared
invalid, void or unenforceable. Should a court of competent jurisdiction
determine that any provision hereof is unenforceable because it is excessive in
scope, the parties hereto agree that the provision shall be interpreted and
enforced to the maximum extent which such court deems enforceable.

         8.2. Specific Enforcement. Purchaser, on the one hand, and the Company,
on the other, acknowledge and agree that irreparable damage would occur in the
event that any of the provisions of this Agreement were not performed in
accordance with their specific terms or were otherwise breached. It is
accordingly agreed that the parties shall be entitled to an injunction to
prevent breaches of the provisions of this Agreement and to enforce specifically
the terms and provisions hereof in any court of the United States or any state
thereof having jurisdiction, this being in addition to any other remedy to which
they may be entitled at law or equity.

         8.3. Entire Agreement. This Agreement (including the schedules hereto),
the Option Agreements, the Registration Rights Agreement and the other documents
delivered in connection herewith or contemplated herein constitute the entire
agreement between the parties and supersede all prior agreements and
understandings, agreements or representations by or between the parties, written
and oral, with respect to the subject matter hereof and thereof. Purchaser and
the Company hereby terminate the Letter Agreement.


                                      -29-
<PAGE>   33

         8.4. Counterparts. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement, and
shall become effective when one or more of the counterparts have been signed by
each party and delivered to the other parties, it being understood that all
parties need not sign the same counterpart.

         8.5. Notices and Other Communications. All notices, consents, requests,
instructions, approvals, financial statements, proxy statements, reports and
other communications provided for herein shall be in writing and shall be
delivered personally, by telecopy (and confirmed by telephone) or sent by
prepaid overnight courier service, to the applicable address set forth below.

              If to the Company, to:

              The UniMark Group, Inc.
              The UniMark House
              P.O. Box 229
              Argyle, TX  76226
              Attention: President
              Telecopier:

              with a copy to:

              Jakes Jordaan, Esq.
              Jordaan & Pennington
              300 Crescent Court, Suite 1605
              Dallas, TX 75201
              Telecopier: (214) 871-6560

              If to Purchaser, to:

              M & M Nominee L.L.C.
              c/o Soros Fund Managment
              888 Seventh Avenue
              New York, NY  10106
              Attention: Chief Financial Officer
              Telecopier: (212) 974-8399


                                      -30-
<PAGE>   34

              with a copy to:

              Promecap, S.C.
              Bosque de Alisos No. 47A, 3er piso
              Colonia Bosques de las Lomas
              C.P. 05120 Mexico, D.F.
              Mexico
              Attention: Federico Chavez Peon
              Telecopier: 011-525-259-6269

              with a copy to:

              Joseph Stern, Esq.
              Fried, Frank, Harris, Shriver & Jacobson
              One New York Plaza
              New York, New York  10004
              Telecopier: (214) 859-4000

or to such other address as any party may, from time to time, designate in a
written notice given in a like manner.

         8.6. Amendments; Termination; Waivers. This Agreement may not be
amended or terminated except by written agreement of the Company and Purchaser.
This Agreement may not be waived, changed, modified, or discharged orally, but
only by an agreement in writing signed by the party or parties against whom
enforcement of any waiver, change, modification or discharge is sought.
Notwithstanding anything in this Agreement to the contrary, no provision of this
Section 8.6 may be waived, changed or modified.

         8.7. Cooperation. Purchaser and the Company agree to take, or cause to
be taken, all such further or other actions as shall reasonably be necessary to
make effective and consummate the transactions contemplated by this Agreement.

         8.8. Successors and Assigns; Parties in Interest. This Agreement may be
assigned by Purchaser to any Affiliate of Purchaser who agrees in writing to be
bound by the provisions hereof. This Agreement may not be assigned by the
Company. All covenants and agreements contained herein shall bind and inure to
the benefit of the parties hereto and their respective successors and assigns.
In addition, each Purchaser Designee shall be a third party beneficiary of this
Agreement and shall be entitled to enforce this Agreement. Except as provided in
the preceding two sentences and as explicitly provided in Article 6, nothing in
this Agreement, express or implied, is intended to confer upon any Person any
rights or remedies under or by reason of this Agreement.


                                      -31-
<PAGE>   35

         8.9. Expenses. The Company shall pay all costs and expenses of
Purchaser and its Affiliates (including fees and expenses of counsel and
accountants) in connection with their due diligence review of the Company, the
negotiation, execution and delivery of the Letter Agreement, this Agreement and
all other documents in connection herewith, and the closing of the transactions
contemplated hereby, up to a maximum of $100,000, and shall pay costs and
expenses of Purchaser and its Affiliates (including fees and expenses of counsel
and accountants) of their enforcement of the foregoing.

         8.10. Transfer of Shares. (a) Purchaser understands and agrees that the
Primary Shares have not been registered under the Securities Act or the
securities laws of any state and that they may be sold or otherwise disposed of
only in one or more transactions registered under the Securities Act and, where
applicable, such laws or transactions as to which an exemption from the
registration requirements of the Securities Act and, where applicable, such laws
are available. Purchaser acknowledges that, except as provided in the
Registration Rights Agreement, Purchaser has no right to require the Company to
register the Primary Shares. Purchaser understands and agrees that each
certificate representing the Primary Shares shall bear legends substantially in
the form as follows:

                    "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT 
               BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR THE
               SECURITIES LAWS OF ANY STATE AND MAY NOT BE SOLD OR OTHERWISE
               DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION
               STATEMENT UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS OR
               AN APPLICABLE EXEMPTION TO THE REGISTRATION REQUIREMENTS OF SUCH
               ACT OR SUCH LAWS."

         8.11. Governing Law; Consent to Jurisdiction. THIS AGREEMENT SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE
WITHOUT GIVING EFFECT TO THE PRINCIPLES OF CONFLICTS OF LAW. EACH OF THE PARTIES
HERETO HEREBY IRREVOCABLY AND UNCONDITIONALLY CONSENTS TO SUBMIT TO THE
EXCLUSIVE JURISDICTION OF THE COURTS OF THE STATE OF DELAWARE AND OF THE UNITED
STATES OF AMERICA, IN EACH CASE LOCATED IN WILMINGTON, DELAWARE, FOR ANY ACTION
IN ANY COURT OR BEFORE ANY GOVERNMENTAL AUTHORITY ("LITIGATION") ARISING OUT OF
OR RELATING TO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED HEREBY (AND
AGREES NOT TO COMMENCE ANY LITIGATION RELATING THERETO EXCEPT IN SUCH COURTS).
EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY
OBJECTION TO THE LAYING OF VENUE OF ANY LITIGATION ARISING OUT OF THIS AGREEMENT
OR THE TRANSACTIONS CONTEMPLATED HEREBY IN THE COURTS OF THE STATE OF DELAWARE
OR 


                                      -32-
<PAGE>   36

THE UNITED STATES OF AMERICA, IN EACH CASE LOCATED IN WILMINGTON, DELAWARE, AND
HEREBY FURTHER IRREVOCABLY AND UNCONDITIONALLY WAIVES AND AGREES NOT TO PLEAD OR
CLAIM IN ANY SUCH COURT THAT ANY SUCH LITIGATION BROUGHT IN ANY SUCH COURT HAS
BEEN BROUGHT IN AN INCONVENIENT FORUM. EACH OF THE PARTIES IRREVOCABLY AND
UNCONDITIONALLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY
AND ALL RIGHTS TO TRIAL BY JURY IN CONNECTION WITH ANY LITIGATION ARISING OUT OF
OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

         8.12. Publicity. Each of the parties hereto agrees that it will make no
statement regarding the transactions contemplated hereby which is inconsistent
with the press release agreed to by the parties hereto. Notwithstanding the
foregoing, each of the parties hereto may, in documents required to be filed by
it with the Commission or other regulatory bodies, make such statements with
respect to the transactions contemplated hereby as each may be advised is
legally necessary upon advice of its counsel.

                  [Remainder of page left intentionally blank.]


                                      -33-
<PAGE>   37

         IN WITNESS WHEREOF, the Company and Purchaser have caused this
Agreement to be executed and delivered by their respective officers as of the
date first above written.



                                  THE UNIMARK GROUP, INC.


                                  By: /s/ Rafael Vaquero Bazan
                                      ------------------------------------------
                                      Name:  Rafael Vaquero Bazan
                                      Title: President, Chief Executive
                                             Officer and Chief Operating Officer




                                  M & M NOMINEE L.L.C.


                                  By: /s/ Peter Streinger
                                      ------------------------------------------
                                      Name:  Peter Streinger
                                      Title: Manager



                                      -34-

<PAGE>   1
                                                                   EXHIBIT 99.4




                          FIRST STOCK OPTION AGREEMENT

            FIRST STOCK OPTION AGREEMENT (this "First Option Agreement") dated
as of July 17, 1998, by and between M & M NOMINEE L.L.C., a Delaware limited
liability company ("Purchaser"), and THE UNIMARK GROUP, INC., a Texas
corporation (the "Company").

                              W I T N E S S E T H

            WHEREAS, the Board of Directors of Purchaser and the Board of
Directors of the Company have approved a Purchase Agreement dated as of even
date herewith (the "Purchase Agreement") providing for the issuance by the
Company and the purchase by Purchaser of shares of common stock, par value
$0.01 per share, of the Company (the "Common Stock");

            WHEREAS, to induce Purchaser to enter into the Purchase Agreement,
the Company has agreed to (i) grant to Purchaser an option pursuant to the
Second Option Agreement, by and between Purchaser and the Company, dated as of
the date hereof (the "Second Option Agreement"), and (ii) grant to Purchaser
the option set forth herein to purchase authorized but unissued shares of
Common Stock.

            NOW, THEREFORE, to induce Purchaser to enter into the Purchase
Agreement and in consideration of the premises herein contained, the parties
agree as follows:

1.       Definitions.  Capitalized terms used but not defined herein shall have
the same meanings as in the Purchase Agreement.

2.       Grant of Option.  Subject to the terms and conditions set forth
herein, the Company hereby grants to Purchaser an option (the "Option") to
purchase up to 1,000,000 authorized and unissued shares of Common Stock (the
"Option Shares"), at a price per share equal to $4.5375 (the "Exercise Price")
payable in cash as provided in Section 4 hereof.

3.       Exercise of Option.  (a)  Purchaser may exercise the Option, in whole
or in part, at any time or from time to time during the Exercise Period.  The
"Exercise Period" shall be the period from the date hereof until and including
the first anniversary of the date hereof.  Except as provided by the last
sentence of this Section 3(a), at 11:59 p.m.  (Dallas, TX time) on the last day
of the Exercise Period the Option, to the extent it shall not have been
exercised, shall terminate and be of no further force and effect.  If the
Option cannot be exercised prior to the first anniversary of the date hereof as
a result of any injunction, order or other legal restraint (each, a
"Restraint"), the Exercise Period shall terminate on the later of (i) the first
anniversary of the date hereof and (ii) the 10th business day after
<PAGE>   2
such Restraint shall have been dissolved or shall have become permanent and no
longer subject to appeal, as the case may be, but in no event later than 18
months after the date hereof.  If, at the end of the Exercise Period, such
Restraint shall not have been dissolved or otherwise resolved (to the
reasonable satisfaction of Purchaser) to allow the exercise of the Option,
then, upon written request made by Purchaser within 14 days of the end of the
Exercise Period, the Company shall redeem the Option for a redemption price
equal to (x) the excess of the Current Market Price (as defined in Section 6)
of the Common Stock as of the first anniversary of the date hereof over the
Exercise Price, multiplied by (y) the number of shares that would be issued
upon exercise of the Option but for the Restraint.

         (b)     Whenever Purchaser wishes to exercise the Option, it shall
deliver to the Company a written notice (the 'Notice", the date of receipt of
which being herein referred to as the "Notice Date") specifying (i) the total
number of shares it intends to purchase pursuant to such exercise, and (ii) a
place and date not earlier than two business days nor later than 60 calendar
days from the Notice Date for the closing of such purchase (a "Closing Date");
provided that if any closing of the purchase and sale pursuant to the Option (a
"Closing") cannot be consummated by reason of any applicable Law, the period of
time that otherwise would run from the Notice Date pursuant to this sentence
shall run instead from the date on which such restriction on consummation has
expired or been terminated; and provided further that, without limiting the
foregoing, if prior notification to or approval of any Governmental Authority
is required in connection with such purchase, Purchaser and, if applicable, the
Company shall promptly file the required notice or application for approval and
shall expeditiously process the same (and the Company shall cooperate with
Purchaser in the filing of any such notice or application and the obtaining of
any such approval), and the period of time that otherwise would run from the
Notice Date pursuant to this sentence shall run instead from the date on which,
as the case may be, (i) any required notification period has expired or been
terminated or (ii) such approval has been obtained, and in either event, any
requisite waiting period has passed.  If such notification period has not
expired or been terminated or such approval has not been obtained, or such
waiting period has not passed, in any case the effect of which is to prevent or
delay the Closing for 90 days beyond the Notice Date, then, upon written
request made by Purchaser within 14 days of the end of such 90 day period, the
Company shall redeem the Option for a redemption price equal to (x) the excess
of the Current Market Price of the Common Stock as of the first anniversary of
the date hereof over the Exercise Price, multiplied by (y) the number of shares
specified in the Notice.

         (c)     In connection with any Closing, the Company may request that
Purchaser represent that, as of the Closing Date applicable to such Closing,
(i) Purchaser is an "accredited investor" within the meaning of Rule 501 of the
Securities Act, and (ii) Purchaser is acquiring the Option Shares being
purchased at such Closing for the purpose of investment and not with a view to
or for sale in connection with any distribution thereof.  If the Company makes
such a request and Purchaser fails to make


                                    - 2 -
<PAGE>   3



such representations, then (except as provided in the following sentence) the
Company shall have no obligation to effect such Closing.  Purchaser may, in
lieu of making the representation set forth in clause (i), furnish the Company
with an opinion of counsel reasonably acceptable to the Company, to the effect
that the acquisition of the Option Shares at such Closing is exempt from
registration under the Securities Act and applicable state securities laws.
Notwithstanding the foregoing purchaser shall not be required to make the
representation set forth in clause (i) or furnish such a legal opinion if
purchaser is exercising the Option and immediately thereafter selling the
Option Shares pursuant to the Registration Rights Agreement.

4.       Payment and Delivery of Certificates.  (a) At each Closing, Purchaser
shall pay to the Company the aggregate Exercise Price for the Option Shares
purchased at such Closing pursuant to the exercise of the Option in immediately
available funds by wire transfer to a bank account designated not later than
one business day prior to the Closing Date for such Closing by the Company.

         (b)     At such Closing, simultaneously with the delivery of the
aggregate Exercise Price as provided in Section 4(a) hereof, the Company shall
deliver to Purchaser a certificate or certificates representing the number of
Option Shares then being purchased by Purchaser, registered in the name of
Purchaser or as designated in writing by Purchaser, which Option Shares shall
be fully paid and nonassessable and free and clear of all liens, claims,
charges and encumbrances of any kind whatsoever.

         (c)     If at the time of issuance of any Option Shares pursuant to
any exercise of the Option, the Company shall have issued any share purchase
rights or similar securities ("Rights") to holders of any class of the Common
Stock, then each such Option Share shall also represent Rights with terms
substantially the same as and at least as favorable to Purchaser as those
issued to other holders of the Common Stock.

         (d)     Certificates for Option Shares delivered at any Closing
hereunder shall be endorsed with a restrictive legend, which shall read
substantially as follows:

            "The securities represented by this certificate have not been
            registered under the Securities Act of 1933 or the securities laws
            of any state and may not be sold or otherwise disposed of except
            pursuant to an effective registration statement under such act and
            applicable state securities laws or an applicable exemption to the
            registration requirements of such act or such laws."

It is understood and agreed that the above legend shall be removed by delivery
of substitute certificate(s) without such legend in connection with a transfer
or sale if (i) the Company has been furnished with an opinion of counsel,
reasonably satisfactory to counsel for the Company, that such transfer or sale
will not violate the Securities Act or





                                    - 3 -
<PAGE>   4



applicable securities laws of any state or (ii) such transfer or sale shall
have been registered and qualified pursuant to the Securities Act and any
applicable state securities laws.

5.       Representations and Warranties; Covenants.  (a) The Company hereby
represents and warrants to Purchaser that: (i) the Company has full corporate
right, power and authority to execute and deliver this First Option Agreement
and to perform all of its obligations hereunder; (ii) such execution, delivery
and performance have been duly authorized by the Board of Directors of the
Company, and no other corporate proceedings are necessary therefor; (iii) this
First Option Agreement has been duly and validly executed and delivered by the
Company and represents a valid and legally binding obligation of the Company,
enforceable against the Company in accordance with its terms; and (iv) the
Company has taken all necessary corporate action to authorize and reserve and
permit it to issue, and at all times from the date hereof through the date of
the exercise in full or the expiration or termination of the Option, shall have
reserved for issuance upon exercise of the Option, 1,000,000 shares of Common
Stock (subject to adjustment as provided herein), all of which, upon issuance
in accordance with the terms of this First Option Agreement, shall be duly
authorized, validly issued, fully paid and nonassessable, shall be delivered
free and clear of all claims, liens, encumbrances and security interests and
not subject to any preemptive rights of any stockholder of the Company, and
will be eligible for NASDAQ NMS trading without further consents or actions
(other than registration thereof pursuant to the Registration Rights
Agreement).

         (b)     Purchaser hereby represents and warrants to the Company that
(i) Purchaser has full corporate right, power and authority to execute and
deliver this First Option Agreement and to perform all of its obligations
hereunder; (ii) such execution, delivery and performance have been duly
authorized by all requisite corporate action by Purchaser, and no other
corporate proceedings are necessary therefor; (iii) this First Option Agreement
has been duly and validly executed and delivered by Purchaser and represents a
valid and legally binding obligation of Purchaser, enforceable against
Purchaser in accordance with its terms; and (iv) any Common Stock acquired by
Purchaser upon exercise of the Option will not be transferred or otherwise
disposed of for one year from the date hereof and then only in compliance with
the Securities Act.

6.       Adjustment upon Changes in Capitalization.  (a)  In the event of any
change in the Common Stock by reason of stock dividends, stock splits,
recapitalizations or the like, the type and number of shares subject to the
Option and the Exercise Price shall be adjusted appropriately.

         (b)     If at any time following the date hereof, the Company shall
issue shares of Common Stock (or rights, warrants or other securities
convertible into or exchangeable for shares of Common Stock (collectively
"Convertible Securities")) at a price per share





                                    - 4 -
<PAGE>   5



(or having a conversion price per share) less than the Current Market Price (as
defined below) per share of Common Stock as of the date of issuance of such
shares (or, in the case of Convertible Securities, less than the Current Market
Price as of the date of issuance of the Convertible Securities in respect of
which shares of Common Stock were issued), then the Exercise Price shall be
adjusted by multiplying (A) the Exercise Price in effect on the day immediately
prior to such date by (B) a fraction, the numerator of which shall be the sum
of (1) the number of shares of Common Stock outstanding on such date and (2)
the number of shares of Common Stock purchasable at the then Current Market
Price per share with the aggregate consideration receivable by the Company for
the total number of shares of Common Stock so issued (or into which the
Convertible Securities may convert), and the denominator of which shall be the
sum of (x) the number of shares of Common Stock outstanding on such date and
(y) the number of additional shares of Common Stock issued (or into which the
Convertible Securities may convert).

         An adjustment made pursuant to this Section 6(b) shall be made on the
next business day following the date on which any such issuance is made and
shall be effective retroactively to the close of business on the date of such
issuance.  For purposes of this Section 6(b), the aggregate consideration
receivable by the Company in connection with the issuance of shares of Common
Stock or of Convertible Securities shall be deemed to be equal to the sum of
the aggregate offering price (before deduction of underwriting discounts or
commissions and expenses payable to third parties) of all such Common Stock and
Convertible Securities plus the minimum aggregate amount, if any, payable upon
exercise or conversion of any such Convertible Securities.  The issuance or
reissuance of any shares of Common Stock (whether treasury shares or newly
issued shares) pursuant to (i) a dividend or distribution on, or subdivision,
combination or reclassification of, the outstanding shares of Common Stock
requiring an adjustment in the Exercise Price pursuant to Section 6(a), or (ii)
any stock option plan, stock purchase plan or other benefit program of the
Company or executive compensation package approved by the Company's Board of
Directors involving the grant of options to employees or directors of the
Company shall not be deemed to constitute an issuance of Common Stock or
Convertible Securities by the Company to which this Section 6(b) applies.  Upon
the expiration unexercised of any Convertible Securities for which an
adjustment has been made pursuant to this Section 6(b), the adjustments shall
forthwith be reversed to effect such rate of conversion as would have been in
effect at the time of such expiration or termination had such Convertible
Securities, to the extent outstanding immediately prior to such expiration or
termination, never been issued.

         "Current Market Price", when used with reference to shares of the
Common Stock or another security on any date, shall mean the average of the
daily closing prices per share of such Common Stock or other security for the
20 preceding trading days.  If the Common Stock or such other securities are
listed or admitted to trading on a national securities exchange, the closing
price shall be the last sale price, regular way, or, in case





                                    - 5 -
<PAGE>   6



no such sale takes place on such day, the average of the closing bid and asked
prices, regular way, in either case as reported in the principal consolidated
transaction reporting system with respect to securities listed or admitted to
trading on the New York Stock Exchange or, if the Common Stock or such other
securities are not listed or admitted to trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting
system with respect to securities listed on the principal national securities
exchange on which the Common Stock or such other securities are listed or
admitted to trading or, if the Common Stock or such other securities are not so
listed on any national securities exchange, as reported in the transaction
reporting system applicable to securities designated as a "national market
system security" or NASDAQ.  If the Common Stock or such other securities are
not publicly held or so listed or designated, "Current Market Price" shall mean
the Fair Market Value (as defined below) per share of Common Stock or of such
other securities as determined in good faith by the Board of Directors of the
Company based on an opinion of an independent investment banking firm with an
established national reputation with respect to the valuation of securities.

         "Fair Market Value" shall mean, as to shares of Common Stock or any
other securities of the Company or any other issuer which are publicly traded,
the Current Market Prices of such shares or securities.  The "Fair Market
Value" of any security which is not publicly traded or of any other property
shall mean the fair value thereof as determined by an independent investment
banking or appraisal firm experienced in the valuation of such securities or
property selected in good faith by the Board of Directors of the Company.

         (c)     In case the Company shall at any time or from time to time
after the date hereof declare, order, pay or make a dividend or other
distribution (including, without limitation, any distribution of stock or other
securities or property or Convertible Securities of the Company or any of its
Subsidiaries by way of dividend or spinoff), on its Common Stock, then, and in
each such case, the Exercise Price shall be adjusted by multiplying (1) the
applicable Exercise Price on the day immediately prior to the record date fixed
for the determination of stockholders entitled to receive such dividend or
distribution by (2) a fraction, the numerator of which shall be the Current
Market Price of the Common Stock less the Fair Market Value of such dividend or
distribution (per share of Common Stock), and the denominator of which shall be
such average Current Market Price of the Common Stock.  If any dividend or
distribution is declared or ordered and a Closing Date is before the record
date for such dividend or distribution, then no adjustment in respect thereof
shall be made to the Exercise Price with respect to the Option Shares acquired
on such Closing Date.

         (d)     For purposes of this Section 6, the number of shares of Common
Stock at any time outstanding shall not include any shares of Common Stock then
owned or held by or for the account of the Company.





                                    - 6 -
<PAGE>   7



         (e)     The term "dividend," as used in this Section 6, shall mean a
dividend or other distribution in respect of shares of Common Stock of the
Company.

         (f)     Anything in this Section 6 to the contrary notwithstanding,
the Company shall not be required to give effect to any adjustment in the
Exercise Price unless and until the net effect of one or more adjustments (each
of which shall be carried forward), determined as above provided, shall have
resulted in a change of the Exercise Price by at least one percent, and when
the cumulative net effect of more than one adjustment so determined shall be to
change the Exercise Price by at least one percent, such change in Exercise
Price shall thereupon be given effect.

         (g)     The certificate of any firm of independent public accountants
of recognized national standing selected by the Board of Directors of the
Company (which may be the firm of independent public accountants regularly
employed by the Company) shall be presumptively correct for any computation
made under this Section 6.

7.       Registration Rights.  Contemporaneously herewith, Purchaser and the
Company are entering into a Registration Rights Agreement providing for
registration of the Option Shares.

8.       Listing.  If the Common Stock or any other securities to be acquired
upon exercise of the Option are then listed on any national securities
exchange, the Company, upon the request of Purchaser, will promptly file an
application to list the Option Shares or other securities to be acquired upon
exercise of the Option on all such exchanges and will use its best efforts to
obtain approval of such listings as soon as practicable.

9.       Survival.  The representations, warranties, covenants and agreements of
the parties hereto shall survive any Closing.

10.      Severability.  Any term, provision, covenant or restriction contained 
in this First Option Agreement held by a court or other Governmental Authority
of competent jurisdiction to be invalid, void or unenforceable shall be
ineffective to the extent of such invalidity, voidness or unenforceability, but
neither the remaining terms, provisions, covenants or restrictions contained in
this First Option Agreement nor the validity or enforceability thereof in any
other jurisdiction shall be affected or impaired thereby.  Any term, provision,
covenant or restriction contained in this First Option Agreement that is so
found to be so broad as to be unenforceable shall be interpreted to be as broad
as is enforceable.

11.      Entire Agreement.  This First Option Agreement, the Second Option
Agreement, the Purchase Agreement (including the documents and the instruments
referred to therein or delivered in connection therewith) and the Registration
Rights Agreement constitute the entire agreement between the parties and
supersede all prior agreements and





                                    - 7 -
<PAGE>   8



understandings, agreements or representations by or between the parties,
written and oral, with respect to the subject matter hereof and thereof.

12.      Successors; No Third Party Beneficiaries.  The terms and conditions of
this First Option Agreement shall inure to the benefit of and be binding upon
the parties hereto and their respective successors and assigns.  Nothing in
this First Option Agreement, expressed or implied, is intended to confer upon
any party, other than the parties hereto, and their respective successors and
assigns, any rights, remedies, obligations, or liabilities under or by reason
of this First Option Agreement, except as expressly provided herein.

13.      Notices.  All notices or other communications which are required or
permitted hereunder shall be in writing and sufficient if delivered in
accordance with Section 8.5 of the Purchase Agreement (which is incorporated
herein by reference).

14.      Further Assurances.  In the event of any exercise of the Option by
Purchaser, the Company and Purchaser shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such
exercise.

15.      Specific Performance.  The parties hereto agree that if for any reason
Purchaser or the Company shall have failed to perform its obligations under
this First Option Agreement, then either party hereto seeking to enforce this
First Option Agreement against such non-performing party shall be entitled to
specific performance and injunctive and other equitable relief, and the parties
hereto further agree to waive any requirement for the securing or posting of
any bond in connection with the obtaining of any such injunctive or other
equitable relief.  This provision is without prejudice to any other rights that
either party hereto may have against the other party hereto for any failure to
perform its obligations under this First Option Agreement.

16.       Governing Law.  This First Option Agreement shall be governed by the
laws of the State of Delaware, without giving effect to the conflict of laws
principles thereof.  Each party hereby irrevocably and unconditionally consents
to submit to the exclusive jurisdiction of the courts of the State of Delaware
and of the United States of America located in Wilmington, Delaware, for any
Litigation (and agrees not to commence any Litigation except in any such
court).  Each party hereby irrevocably and unconditionally waives any objection
to the laying of venue of any Action in the courts of the State of Delaware or
of the United States of America located in Wilmington, Delaware, and hereby
further irrevocably and unconditionally waives and agrees not to plead or claim
in any such court that any Action brought in any such court has been brought in
an inconvenient forum.





                                    - 8 -
<PAGE>   9




17.      Regulatory Approvals; Section 16(b).  If, in connection with the
exercise of the Option under Section 3, prior notification to or approval of
any Governmental Authority is required, then the required notice or application
for approval shall be promptly filed and/or expeditiously processed by the
Company and periods of time that otherwise would run pursuant hereto (if any)
shall run instead from the date on which any such required notification period
has expired or been terminated or such approval has been obtained, and in
either event, any requisite waiting period shall have passed.  Periods of time
that otherwise would run pursuant to this First Option Agreement shall also be
extended to the extent necessary in order to avoid liability under Section
16(b) of the Exchange Act.

18.      Waiver and Amendment.  Any provision of this First Option Agreement
may be waived in writing at any time by the party that is entitled to the
benefits of such provision.  This First Option Agreement may not be modified,
amended, altered or supplemented except upon the execution and delivery of a
written agreement executed by the parties hereto.





                                    - 9 -
<PAGE>   10




            IN WITNESS WHEREOF, each of the parties hereto has executed this
First Option Agreement as of the date first written above.

                                       PURCHASER:

                                       M & M NOMINEE L.L.C.


                                       By:    /s/ Peter Streinger
                                             ------------------------------
                                             Name:   Peter Streinger
                                             Title:  Manager


                                       THE COMPANY:

                                       THE UNIMARK GROUP, INC.


                                       By:    /s/ Rafael Vaquero Bazan
                                             ------------------------------
                                             Name:   Rafael Vaquero Bazan
                                             Title:  President, Chief Executive
                                                     Officer and Chief
                                                     Operating Officer






                                   - 10 -


<PAGE>   1
                                                                    EXHIBIT 99.5




                         SECOND STOCK OPTION AGREEMENT

            SECOND STOCK OPTION AGREEMENT (this "Second Option Agreement")
dated as of July 17, 1998, by and between M & M NOMINEE L.L.C., a Delaware
limited liability company ("Purchaser"), and THE UNIMARK GROUP, INC., a Texas
corporation (the "Company").

                              W I T N E S S E T H

            WHEREAS, the Board of Directors of Purchaser and the Board of
Directors of the Company have approved a Purchase Agreement dated as of even
date herewith (the "Purchase Agreement") providing for the issuance by the
Company and the purchase by Purchaser of shares of common stock, par value
$0.01 per share, of the Company (the "Common Stock");

            WHEREAS, to induce Purchaser to enter into the Purchase Agreement,
the Company has agreed to (i) grant to Purchaser an option pursuant to the
First Option Agreement, by and between Purchaser and the Company, dated as of
the date hereof (the "First Option Agreement"), and (ii) grant to Purchaser the
option set forth herein to purchase authorized but unissued shares of Common
Stock;

            NOW, THEREFORE, to induce Purchaser to enter into the Purchase
Agreement and in consideration of the premises herein contained, the parties
agree as follows:

1.       Definitions.  Capitalized terms used but not defined herein shall have
the same meanings as in the Purchase Agreement.

2.       Grant of Option.  Subject to the terms and conditions set forth
herein, the Company hereby grants to Purchaser an option (the "Option") to
purchase up to 1,000,000 authorized and unissued shares of Common Stock (the
"Option Shares"), at a price per share equal to $4.5375 (the "Exercise Price")
payable in cash as provided in Section 4 hereof.

3.    Exercise of Option.  (a)  Purchaser may exercise the Option, in whole or
in part, at any time or from time to time during the Exercise Period.  The
"Exercise Period" shall be the period from the date hereof until and including
the third anniversary of the date hereof.  Except as provided by the last
sentence of this Section 3(a), at 11:59 p.m.  (Dallas, TX time) on the last day
of the Exercise Period the Option, to the extent it shall not have


                                    - 1 -
<PAGE>   2
been exercised, shall terminate and be of no further force and effect.  If the
Option cannot be exercised prior to the third anniversary of the date hereof as
a result of any injunction, order or other legal restraint (each, a
"Restraint"), the Exercise Period shall terminate on the later of (i) the third
anniversary of the date hereof and (ii) the 10th business day after such
Restraint shall have been dissolved or shall have become permanent and no
longer subject to appeal, as the case may be, but in no event later than three
years and six months after the date hereof.  If, at the end of the Exercise
Period, such Restraint shall not have been dissolved or otherwise resolved (to
the reasonable satisfaction of Purchaser) to allow the exercise of the Option,
then, upon written request made by Purchaser within 14 days of the end of the
Exercise Period, the Company shall redeem the Option for a redemption price
equal to (x) the excess of the Current Market Price (as defined in Section 6)
of the Common Stock as of the third anniversary of the date hereof over the
Exercise Price, multiplied by (y) the number of shares that would be issued
upon exercise of the Option but for the Restraint.

         (b)     Whenever Purchaser wishes to exercise the Option, it shall
deliver to the Company a written notice (the 'Notice", the date of receipt of
which being herein referred to as the "Notice Date") specifying (i) the total
number of shares it intends to purchase pursuant to such exercise, and (ii) a
place and date not earlier than two business days nor later than 60 calendar
days from the Notice Date for the closing of such purchase (a "Closing Date");
provided that if any closing of the purchase and sale pursuant to the Option (a
"Closing") cannot be consummated by reason of any applicable Law, the period of
time that otherwise would run from the Notice Date pursuant to this sentence
shall run instead from the date on which such restriction on consummation has
expired or been terminated; and provided further that, without limiting the
foregoing, if prior notification to or approval of any Governmental Authority
is required in connection with such purchase, Purchaser and, if applicable, the
Company shall promptly file the required notice or application for approval and
shall expeditiously process the same (and the Company shall cooperate with
Purchaser in the filing of any such notice or application and the obtaining of
any such approval), and the period of time that otherwise would run from the
Notice Date pursuant to this sentence shall run instead from the date on which,
as the case may be, (i) any required notification period has expired or been
terminated or (ii) such approval has been obtained, and in either event, any
requisite waiting period has passed.  If such notification period has not
expired or been terminated or such approval has not been obtained, or such
waiting period has not passed, in any case the effect of which is to prevent or
delay the Closing for 90 days beyond the Notice Date, then, upon written
request made by Purchaser within 14 days of the end of such 90 day period, the
Company shall redeem the Option for a redemption price equal to (x) the excess
of the Current Market Price of the Common Stock as of the third anniversary of
the date hereof over the Exercise Price, multiplied by (y) the number of shares
specified in the Notice.

                                    - 2 -
<PAGE>   3
         (c)     In connection with any Closing, the Company may request that
Purchaser represent that, as of the Closing Date applicable to such Closing,
(i) Purchaser is an "accredited investor" within the meaning of Rule 501 of the
Securities Act, and (ii) Purchaser is acquiring the Option Shares being
purchased at such Closing for the purpose of investment and not with a view to
or for sale in connection with any distribution thereof.  If the Company makes
such a request and Purchaser fails to make such representations, then (except
as provided in the following sentence) the Company shall have no obligation to
effect such Closing.  Purchaser may, in lieu of making the representation set
forth in clause (i), furnish the Company with an opinion of counsel reasonably
acceptable to the Company, to the effect that the acquisition of the Option
Shares at such Closing is exempt from registration under the Securities Act and
applicable state securities laws.  Notwithstanding the foregoing purchaser
shall not be required to make the representation set forth in clause (i) or
furnish such a legal opinion if purchaser is exercising the Option and
immediately thereafter selling the Option Shares pursuant to the Registration
Rights Agreement.

         (d)     Notwithstanding the foregoing, if, on any date subsequent to
180 days from the date hereof, the Current Market Price of the Common Stock
exceeds $6 (each such date, a "Threshold Date"), then the Company may require
Purchaser to either exercise or forfeit the Option as follows: (i) within 14
calendar days of any Threshold Date, the Company may deliver a written notice
(a "Notice") to Purchaser specifying that it is exercising its right under this
Section 3(d) and specifying the number of shares to be purchased (which number
may be all or a portion of the shares then subject to the Option), and (ii)
Purchaser shall have 60 calendar days to respond to such Notice either electing
to (x) exercise the Option to the extent set forth in such Notice or (y)
forfeit the Option (but only in respect of the number of shares set forth in
such Notice).  If Purchaser fails to respond within such 60 calendar day
period, Purchaser shall be deemed to have forfeited the Option (but only in
respect of the number of shares set forth in such Notice).

4.       Payment and Delivery of Certificates.  (a) At each Closing, Purchaser
shall pay to the Company the aggregate Exercise Price for the Option Shares
purchased at such Closing pursuant to the exercise of the Option in immediately
available funds by wire transfer to a bank account designated not later than
one business day prior to the Closing Date for such Closing by the Company.

         (b)     At such Closing, simultaneously with the delivery of the
aggregate Exercise Price as provided in Section 4(a) hereof, the Company shall
deliver to Purchaser a certificate or certificates representing the number of
Option Shares then being purchased by Purchaser, registered in the name of
Purchaser or as designated in writing by

                                    - 3 -
<PAGE>   4
Purchaser, which Option Shares shall be fully paid and nonassessable and free
and clear of all liens, claims, charges and encumbrances of any kind
whatsoever.

         (c)     If at the time of issuance of any Option Shares pursuant to
any exercise of the Option, the Company shall have issued any share purchase
rights or similar securities ("Rights") to holders of any class of the Common
Stock, then each such Option Share shall also represent Rights with terms
substantially the same as and at least as favorable to Purchaser as those
issued to other holders of the Common Stock.

         (d)     Certificates for Option Shares delivered at any Closing
hereunder shall be endorsed with a restrictive legend, which shall read
substantially as follows:

            "The securities represented by this certificate have not been
            registered under the Securities Act of 1933 or the securities laws
            of any state and may not be sold or otherwise disposed of except
            pursuant to an effective registration statement under such act and
            applicable state securities laws or an applicable exemption to the
            registration requirements of such act or such laws."

It is understood and agreed that the above legend shall be removed by delivery
of substitute certificate(s) without such legend in connection with a transfer
or sale if (i) the Company has been furnished with an opinion of counsel,
reasonably satisfactory to counsel for the Company, that such transfer or sale
will not violate the Securities Act or applicable securities laws of any state
or (ii) such transfer or sale shall have been registered and qualified pursuant
to the Securities Act and any applicable state securities laws.

5.       Representations and Warranties; Covenants.  (a) The Company hereby
represents and warrants to Purchaser that: (i) the Company has full corporate
right, power and authority to execute and deliver this Second Option Agreement
and to perform all of its obligations hereunder; (ii) such execution, delivery
and performance have been duly authorized by the Board of Directors of the
Company, and no other corporate proceedings are necessary therefor; (iii) this
Second Option Agreement has been duly and validly executed and delivered by the
Company and represents a valid and legally binding obligation of the Company,
enforceable against the Company in accordance with its terms; and (iv) the
Company has taken all necessary corporate action to authorize and reserve and
permit it to issue, and at all times from the date hereof through the date of
the exercise in full or the expiration or termination of the Option, shall have
reserved for issuance upon exercise of the Option, 1,000,000 shares of Common
Stock (subject to adjustment as provided herein), all of which, upon issuance
in accordance with the terms

                                    - 4 -
<PAGE>   5
of this Second Option Agreement, shall be duly authorized, validly issued,
fully paid and nonassessable, shall be delivered free and clear of all claims,
liens, encumbrances and security interests and not subject to any preemptive
rights of any stockholder of the Company, and will be eligible for NASDAQ NMS
trading without further consents or actions (other than registration thereof
pursuant to the Registration Rights Agreement).  Notwithstanding anything
contained in the Purchase Agreement to the contrary, the representations,
warranties and covenants contained in this Section 5 shall survive for three
years from the date hereof.

         (b)     Purchaser hereby represents and warrants to the Company that
(i) Purchaser has full corporate right, power and authority to execute and
deliver this Second Option Agreement and to perform all of its obligations
hereunder; (ii) such execution, delivery and performance have been duly
authorized by all requisite corporate action by Purchaser, and no other
corporate proceedings are necessary therefor; (iii) this Second Option
Agreement has been duly and validly executed and delivered by Purchaser and
represents a valid and legally binding obligation of Purchaser, enforceable
against Purchaser in accordance with its terms; and (iv) any Common Stock
acquired by Purchaser upon exercise of the Option will not be transferred or
otherwise disposed of for 180 days from the date hereof and then only in
compliance with the Securities Act.

6.       Adjustment upon Changes in Capitalization.  (a)  In the event of any
change in the Common Stock by reason of stock dividends, stock splits,
recapitalizations or the like, the type and number of shares subject to the
Option and the Exercise Price shall be adjusted appropriately.

         (b)     If at any time following the date hereof, the Company shall
issue shares of Common Stock (or rights, warrants or other securities
convertible into or exchangeable for shares of Common Stock (collectively
"Convertible Securities")) at a price per share (or having a conversion price
per share) less than the Current Market Price (as defined below) per share of
Common Stock as of the date of issuance of such shares (or, in the case of
Convertible Securities, less than the Current Market Price as of the date of
issuance of the Convertible Securities in respect of which shares of Common
Stock were issued), then the Exercise Price shall be adjusted by multiplying
(A) the Exercise Price in effect on the day immediately prior to such date by
(B) a fraction, the numerator of which shall be the sum of (1) the number of
shares of Common Stock outstanding on such date and (2) the number of shares of
Common Stock purchasable at the then Current Market Price per share with the
aggregate consideration receivable by the Company for the total number of
shares of Common Stock so issued (or into which the Convertible Securities may
convert), and the denominator of which shall be the sum of (x) the number of
shares of Common Stock outstanding on such date and (y) the number of
additional shares of Common Stock issued (or into which the Convertible
Securities may convert).

                                     - 5 -
<PAGE>   6



         An adjustment made pursuant to this Section 6(b) shall be made on the
next business day following the date on which any such issuance is made and
shall be effective retroactively to the close of business on the date of such
issuance.  For purposes of this Section 6(b), the aggregate consideration
receivable by the Company in connection with the issuance of shares of Common
Stock or of Convertible Securities shall be deemed to be equal to the sum of
the aggregate offering price (before deduction of underwriting discounts or
commissions and expenses payable to third parties) of all such Common Stock and
Convertible Securities plus the minimum aggregate amount, if any, payable upon
exercise or conversion of any such Convertible Securities.  The issuance or
reissuance of any shares of Common Stock (whether treasury shares or newly
issued shares) pursuant to (i) a dividend or distribution on, or subdivision,
combination or reclassification of, the outstanding shares of Common Stock
requiring an adjustment in the Exercise Price pursuant to Section 6(a), or (ii)
any stock option plan, stock purchase plan or other benefit program of the
Company or executive compensation package approved by the Company's Board of
Directors involving the grant of options to employees or directors of the
Company shall not be deemed to constitute an issuance of Common Stock or
Convertible Securities by the Company to which this Section 6(b) applies.  Upon
the expiration unexercised of any Convertible Securities for which an
adjustment has been made pursuant to this Section 6(b), the adjustments shall
forthwith be reversed to effect such rate of conversion as would have been in
effect at the time of such expiration or termination had such Convertible
Securities, to the extent outstanding immediately prior to such expiration or
termination, never been issued.

         "Current Market Price", when used with reference to shares of the
Common Stock or another security on any date, shall mean the average of the
daily closing prices per share of such Common Stock or other security for the
20 preceding trading days.  If the Common Stock or such other securities are
listed or admitted to trading on a national securities exchange, the closing
price shall be the last sale price, regular way, or, in case no such sale takes
place on such day, the average of the closing bid and asked prices, regular
way, in either case as reported in the principal consolidated transaction
reporting system with respect to securities listed or admitted to trading on
the New York Stock Exchange or, if the Common Stock or such other securities
are not listed or admitted to trading on the New York Stock Exchange, as
reported in the principal consolidated transaction reporting system with
respect to securities listed on the principal national securities exchange on
which the Common Stock or such other securities are listed or admitted to
trading or, if the Common Stock or such other securities are not so listed on
any national securities exchange, as reported in the transaction reporting
system applicable to securities designated as a "national market system
security" or NASDAQ.  If the Common Stock or such other securities are not
publicly held or so listed or designated, "Current Market Price" shall mean the
Fair Market Value (as defined below) per share of Common Stock or of such other
securities as determined in good faith by the

                                     - 6 -
<PAGE>   7
Board of Directors of the Company based on an opinion of an independent
investment banking firm with an established national reputation with respect to
the valuation of securities.

         "Fair Market Value" shall mean, as to shares of Common Stock or any
other securities of the Company or any other issuer which are publicly traded,
the Current Market Prices of such shares or securities.  The "Fair Market
Value" of any security which is not publicly traded or of any other property
shall mean the fair value thereof as determined by an independent investment
banking or appraisal firm experienced in the valuation of such securities or
property selected in good faith by the Board of Directors of the Company.

         (c)     In case the Company shall at any time or from time to time
after the date hereof declare, order, pay or make a dividend or other
distribution (including, without limitation, any distribution of stock or other
securities or property or Convertible Securities of the Company or any of its
Subsidiaries by way of dividend or spinoff), on its Common Stock, then, and in
each such case, the Exercise Price shall be adjusted by multiplying (1) the
applicable Exercise Price on the day immediately prior to the record date fixed
for the determination of stockholders entitled to receive such dividend or
distribution by (2) a fraction, the numerator of which shall be the Current
Market Price of the Common Stock less the Fair Market Value of such dividend or
distribution (per share of Common Stock), and the denominator of which shall be
such average Current Market Price of the Common Stock.  If any dividend or
distribution is declared or ordered and a Closing Date is before the record
date for such dividend or distribution, then no adjustment in respect thereof
shall be made to the Exercise Price with respect to the Option Shares acquired
on such Closing Date.

         (d)     For purposes of this Section 6, the number of shares of Common
Stock at any time outstanding shall not include any shares of Common Stock then
owned or held by or for the account of the Company.

         (e)     The term "dividend," as used in this Section 6, shall mean a
dividend or other distribution in respect of shares of Common Stock of the
Company.

         (f)     Anything in this Section 6 to the contrary notwithstanding,
the Company shall not be required to give effect to any adjustment in the
Exercise Price unless and until the net effect of one or more adjustments (each
of which shall be carried forward), determined as above provided, shall have
resulted in a change of the Exercise Price by at least one percent, and when
the cumulative net effect of more than one adjustment so determined shall be to
change the Exercise Price by at least one percent, such change in Exercise
Price shall thereupon be given effect.

                                     - 7 -
<PAGE>   8
         (g)     The certificate of any firm of independent public accountants
of recognized national standing selected by the Board of Directors of the
Company (which may be the firm of independent public accountants regularly
employed by the Company) shall be presumptively correct for any computation
made under this Section 6.

7.       Registration Rights.  Contemporaneously herewith, Purchaser and the
Company are entering into a Registration Rights Agreement providing for
registration of the Option Shares.

8.       Listing.  If the Common Stock or any other securities to be acquired
upon exercise of the Option are then listed on any national securities
exchange, the Company, upon the request of Purchaser, will promptly file an
application to list the Option Shares or other securities to be acquired upon
exercise of the Option on all such exchanges and will use its best efforts to
obtain approval of such listings as soon as practicable.

9.    Survival.  The representations, warranties, covenants and agreements of
the parties hereto shall survive any Closing.

10.   Severability.  Any term, provision, covenant or restriction contained in
this Second Option Agreement held by a court or other Governmental Authority of
competent jurisdiction to be invalid, void or unenforceable shall be
ineffective to the extent of such invalidity, voidness or unenforceability, but
neither the remaining terms, provisions, covenants or restrictions contained in
this Second Option Agreement nor the validity or enforceability thereof in any
other jurisdiction shall be affected or impaired thereby.  Any term, provision,
covenant or restriction contained in this Second Option Agreement that is so
found to be so broad as to be unenforceable shall be interpreted to be as broad
as is enforceable.

11.      Entire Agreement.  This Second Option Agreement, the First Option
Agreement, the Purchase Agreement (including the documents and the instruments
referred to therein or delivered in connection therewith) and the Registration
Rights Agreement constitute the entire agreement between the parties and
supersede all prior agreements and understandings, agreements or
representations by or between the parties, written and oral, with respect to
the subject matter hereof and thereof.

12.      Successors; No Third Party Beneficiaries.  The terms and conditions of
this Second Option Agreement shall inure to the benefit of and be binding upon
the parties hereto and their respective successors and assigns.  Nothing in
this Second Option Agreement, expressed or implied, is intended to confer upon
any party, other than the parties hereto, and their respective successors and
assigns, any rights, remedies,

                                    - 8 -
<PAGE>   9
obligations, or liabilities under or by reason of this Second Option Agreement,
except as expressly provided herein.

13.      Notices.  All notices or other communications which are required or
permitted hereunder shall be in writing and sufficient if delivered in
accordance with Section 8.5 of the Purchase Agreement (which is incorporated
herein by reference).

14.      Further Assurances.  In the event of any exercise of the Option by
Purchaser, the Company and Purchaser shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such
exercise.

15.      Specific Performance.  The parties hereto agree that if for any reason
Purchaser or the Company shall have failed to perform its obligations under
this Second Option Agreement, then either party hereto seeking to enforce this
Second Option Agreement against such non-performing party shall be entitled to
specific performance and injunctive and other equitable relief, and the parties
hereto further agree to waive any requirement for the securing or posting of
any bond in connection with the obtaining of any such injunctive or other
equitable relief.  This provision is without prejudice to any other rights that
either party hereto may have against the other party hereto for any failure to
perform its obligations under this Second Option Agreement.

16.       Governing Law.  This Second Option Agreement shall be governed by the
laws of the State of Delaware, without giving effect to the conflict of laws
principles thereof.  Each party hereby irrevocably and unconditionally consents
to submit to the exclusive jurisdiction of the courts of the State of Delaware
and of the United States of America located in Wilmington, Delaware, for any
Litigation (and agrees not to commence any Litigation except in any such
court).  Each party hereby irrevocably and unconditionally waives any objection
to the laying of venue of any Action in the courts of the State of Delaware or
of the United States of America located in Wilmington, Delaware, and hereby
further irrevocably and unconditionally waives and agrees not to plead or claim
in any such court that any Action brought in any such court has been brought in
an inconvenient forum.

17.      Regulatory Approvals; Section 16(b).  If, in connection with the
exercise of the Option under Section 3, prior notification to or approval of
any Governmental Authority is required, then the required notice or application
for approval shall be promptly filed and/or expeditiously processed by the
Company and periods of time that otherwise would run pursuant hereto (if any)
shall run instead from the date on which any such required notification period
has expired or been terminated or such approval has been obtained, and in
either event, any requisite waiting period shall have passed.  Periods of time
that

                                    - 9 -
<PAGE>   10
otherwise would run pursuant to this Second Option Agreement shall also be
extended to the extent necessary in order to avoid liability under Section
16(b) of the Exchange Act.

18.      Waiver and Amendment.  Any provision of this Second Option Agreement
may be waived in writing at any time by the party that is entitled to the
benefits of such provision.  This Second Option Agreement may not be modified,
amended, altered or

                                   - 10 -
<PAGE>   11
supplemented except upon the execution and delivery of a written agreement
executed by the parties hereto.

            IN WITNESS WHEREOF, each of the parties hereto has executed this
Second Option Agreement as of the date first written above.

                                         PURCHASER:

                                         M & M NOMINEE L.L.C.


                                         By: /s/ Peter Streinger
                                             --------------------
                                             Name:    Peter Streinger
                                             Title:   Manager


                                         THE COMPANY:

                                         THE UNIMARK GROUP, INC.


                                         By: /s/ Rafael Vaquero Bazan
                                             -------------------------
                                             Name:    Rafael Vaquero Bazan
                                             Title:   President, Chief Executive
                                                      Officer and Chief
                                                      Operating Officer


                                   - 11 -

<PAGE>   1
                                                                    EXHIBIT 99.6




                          REGISTRATION RIGHTS AGREEMENT


                  REGISTRATION RIGHTS AGREEMENT, dated as of July 17, 1998 (this
"Agreement"), by and between THE UNIMARK GROUP, INC., a Texas corporation (the
"Company"), and M & M Nominee L.L.C., a Delaware limited liability company (the
"Investor").

         1.       Background. The Company and the Investor have entered into a
Purchase Agreement, dated as of the date hereof (the "Purchase Agreement"). In
order to induce the Investor to enter into and consummate the transactions
contemplated by the Purchase Agreement, the Company has agreed to provide the
registration rights set forth in this Agreement. The execution and delivery of
this Registration Rights Agreement is a condition to the execution and delivery
of, and Closing under, the Purchase Agreement.

         2.       Definitions. Capitalized terms used but not defined herein 
shall have the respective meanings given to them in the Purchase Agreement. As
used herein, unless the context otherwise requires, the following terms have the
following respective meanings:

                  "Option Shares" means the shares of Common Stock or other
equity securities issued or issuable upon exercise of either the First Option or
the Second Option.

                  "Incidental Registration" is defined in Section 3.2.

                  "Participating Holders" means the holders of Registrable 
Securities participating in the particular registration.

                  "Registration Expenses" means all expenses incident to the
Company's performance of or compliance with Section 3, including, without
limitation, all registration, filing and applicable fees of the Commission,
stock exchange or NASD registration and filing fees and all listing fees and
fees with respect to the inclusion of securities in NASDAQ (as defined in
Section 3.3(j)), all fees and expenses of complying with state securities or
blue sky laws (including fees and disbursements of counsel to the underwriters
or the Participating Holders in connection with "blue sky" qualification of the
Registrable Securities and determination of their eligibility for investment
under the laws of the various jurisdictions), all word processing, duplicating
and printing expenses, all messenger and delivery expenses, the fees and
disbursements of counsel for the Company and of its independent public
accountants including the expenses of "cold comfort" letters required by or
incident to such registration, all fees and disbursements of underwriters
customarily paid by issuers or sellers of securities, all transfer taxes, and 
the
<PAGE>   2

fees and expenses of one counsel to the Participating Holders (selected by
the Requisite Percentage of Participating Holders); provided, however, that
Registration Expenses shall exclude and the Participating Holders shall pay
underwriters' fees and underwriting discounts and commissions in respect of the
Registrable Securities being registered.

                  "Registrable Securities" means (i) any Primary Shares, (ii)
any Option Shares and (iii) any shares purchased from certain executives of the
Company pursuant to the Shareholders Agreement, dated as of the date hereof, by
and among the Investor, Rafael Vaquero Bazan and Fernando Camacho Casas. As to
any particular Registrable Securities, such securities shall cease to be
Registrable Securities (a) when a registration statement with respect to the
sale of such securities shall have become effective under the Securities Act and
such securities shall have been disposed of in accordance with such registration
statement, (b) when such securities shall have been otherwise transferred, new
certificates for them not bearing a legend restricting further transfer under
the Securities Act shall have been delivered by the Company and subsequent
public distribution of them shall not require registration of them under the
Securities Act, (c) when such securities are sold pursuant to Rule 144 (or
similar rule adopted by the Commission) under the Securities Act, or (d) when
such securities cease to be outstanding.

                  "Requested Registration" is defined in Section 3.1(a).

                  "Requisite Percentage of Outstanding Holders" mean the holders
of Registrable Securities who hold 33% or more of the total Option Shares and
Primary Shares (counted as a single group) that are then outstanding (assuming
that the then exercisable portion of the First Option (if any) and the then
exercisable portion of the Second Option (if any) had been exercised for Option
Shares).

                  "Requisite Percentage of Participating Holders" means
Participating Holders of Registrable Securities who hold a majority of the total
Option Shares and Primary Shares (counted as a single group) that are then be
held by all Participating Holders (assuming that the then exercisable portion of
the First Option (if any) and the then exercisable portion of the Second Option
(if any) had been exercised for Option Shares).

         3.       Registration Under Securities Act, etc.

                  3.1      Requested Registrations.

                           (a)      Request for Registration. Subject to the 
limitations imposed by Sections 3.1(c), at any time and from time to time, one
or more holders of Registrable Securities representing the Requisite Percentage
of Outstanding Holders shall have the right to require the Company to file a
registration statement under the Securities Act 



                                      -2-
<PAGE>   3

covering all or any part of their respective Registrable Securities, by
delivering a written request therefor to the Company specifying the number and
amount of Registrable Securities and the intended method of distribution
thereof. Any such request pursuant to this Section 3.1(a) is referred to herein
as a "Requested Registration." The Company shall give prompt written notice of
each Requested Registration to all other holders of record of Registrable
Securities, and thereupon the Company shall use its best efforts to effect the
registration under the Securities Act so as to permit promptly the sale, in
accordance with the intended method of distribution, of the Registrable
Securities which the Company has been so requested to register in the Requested
Registration and all other Registrable Securities which the Company has been
requested to register by the holders thereof by written request given to the
Company within 30 days after the giving of such written notice by the Company.

                           (b)      Registration of Other Securities. Whenever 
the Company shall effect a registration pursuant to this Section 3.1 in
connection with an underwritten offering by one or more Participating Holders of
Registrable Securities, no securities other than Registrable Securities shall be
included among the securities covered by such registration unless (i)
Participating Holders representing the Requisite Percentage of Participating
Holders shall have consented in writing to the inclusion therein of such other
securities and (ii) such inclusion shall be permitted only to the extent that it
is pursuant to and subject to the terms of the underwriting agreement or
arrangements and the inclusion of such securities will not have a material
adverse effect on the offering (including, without limitation, on the pricing of
the offering).

                           (c)      Limitations on Requested Registrations; 
Expenses. The rights of holders of Registrable Securities to request Requested
Registrations pursuant to Section 3.1(a) are subject to the following
limitations: (i) the Company shall not be obligated to effect a Requested
Registration having an aggregate anticipated offering price of less than
U.S.$2,000,000 unless such offering shall cover all remaining Registrable
Securities; (ii) the offering of Registrable Securities requested to be
registered pursuant to Section 3.1(a) shall be pursuant to a firm commitment
underwritten offering; (iii) the Company shall not be obligated to effect a
Requested Registration within six months after the effective date of any other
registration of securities (other than pursuant to a registration on Form S-8 or
any successor or similar form which is then in effect); and (iv) the Company
will pay all Registration Expenses only in connection with the first three
Requested Registrations of Registrable Securities pursuant to this Section 3.1
that have become effective under the Securities Act.

                           (d)      Registration Statement Form. Registrations 
under this Section 3.1 shall be on Form S-3 or any successor form, if permitted,
or such appropriate registration form of the Commission as shall be selected by
the Company and as shall be


                                      -3-

<PAGE>   4

reasonably acceptable to the Requisite Percentage of Participating Holders. The
Company agrees to include in any such registration statement all information
which, in the opinion of counsel to the Participating Holders and counsel to the
Company, is required to be included.

                           (e)      Effective Registration Statement. A 
registration requested pursuant to this Section 3.1 shall not be deemed to have
been effected (including for purposes of paragraph (c) of this Section 3.1) (i)
unless a registration statement with respect thereto has become effective and
has been kept continuously effective for a period of at least 90 days (or such
shorter period which shall terminate when all the Registrable Securities covered
by such registration statement have been sold pursuant thereto), (ii) if, after
it has become effective, such registration is interfered with by any stop order,
injunction or other order or requirement of the Commission or other Governmental
Authority or court for any reason not attributable to the Participating Holders
and has not thereafter become effective, or (iii) if the conditions to closing
specified in the underwriting agreement, if any, entered into in connection with
such registration are not satisfied or waived, other than by reason of a failure
on the part of the Participating Holders.

                           (f)      Selection of Underwriters. The managing 
underwriter or underwriters of each underwritten offering of the Registrable
Securities so to be registered shall be selected by the Requisite Percentage of
Participating Holders (and shall be reasonably acceptable to the Company).

                           (g)      Cutbacks in Requested Registration. If the 
managing underwriter of any underwritten offering shall advise the Participating
Holders in such offering that the Registrable Securities covered by the
registration statement cannot be sold in such offering within a price range
acceptable to the Requisite Percentage of Participating Holders, then the
Participating Holders representing the Requisite Percentage of Participating
Holders shall have the right to notify the Company in writing that they have
determined that the registration statement be abandoned or withdrawn, in which
event the Company shall abandon or withdraw such registration statement (and, at
the option of the Requisite Percentage of Participating Holders, the
Participating Holders shall either (i) reimburse the Company for its expenses
incurred in connection with such abandoned or withdrawn registration statement
or (ii) allow the Company to count such abandoned or withdrawn registration
statement as one of the three Requested Registrations under Section 3.1(c)(iv)).
If the managing underwriter of any underwritten offering shall advise the
Company in writing (with a copy to each Participating Holder) that, in its
opinion, the number of securities requested to be included in such registration
exceeds the number which can be sold in such offering within a price range
acceptable to the Requisite Percentage of Participating Holders, the Company
will include in such 


                                      -4-
<PAGE>   5

registration, to the extent of the number which the Company is so advised can be
sold in such offering, Registrable Securities requested to be included in such
registration, pro rata among the Participating Holders requesting such
registration in accordance with the number of Primary Shares and Option Shares
held by (or issuable to) each such Participating Holder so requested to be
registered, and any securities of the Company included in such registration
pursuant to Section 3.1(b) shall be reduced proportionately.

                           (h)      Postponement. The Company shall be entitled 
once in any six-month period to postpone for a reasonable period of time (but
not exceeding 90 days) the filing of any registration statement required to be
prepared and filed by it pursuant to this Section 3.1 if the Company determines,
in its reasonable judgment, that such registration and offering would interfere
with any financing, corporate reorganization or other material transaction or
development involving the Company or any subsidiary or would require premature
disclosure thereof, and promptly gives the holders of Registrable Securities
requesting registration thereof pursuant to this Section 3.1 written notice of
such determination, containing a statement of the reasons for such postponement
and an approximation of the anticipated delay. If the Company shall so postpone
the filing of a registration statement, the Participating Holders representing
the Requisite Percentage of Participating Holders shall have the right to
withdraw the request for registration by giving written notice to the Company
within 20 days after receipt of the notice of postponement and, in the event of
such withdrawal, such request shall not be counted toward the number of
Requested Registrations (including for purposes of paragraph (c) of this Section
3.1).

                  3.2      Incidental Registration.

                           (a)      Incidental Registration. If, at any time, 
the Company proposes or is required to register any of its equity securities or
securities convertible into or exchangeable for equity securities under the
Securities Act (other than pursuant to registrations on such form or similar
form(s) solely for registration of securities in connection with an employee
benefit plan or dividend reinvestment plan) (an "Incidental Registration"), the
Company will give prompt written notice to all holders of record of Registrable
Securities of its intention to so register its securities and of such holders'
rights under this Section 3.2. Upon the written request of any holder of
Registrable Securities made within 20 days following the receipt of any such
written notice (which request shall specify the maximum number of Registrable
Securities intended to be disposed of by such holder and the intended method of
distribution thereof), the Company will use its best efforts to effect the
registration under the Securities Act of all Registrable Securities which the
Company has been so requested to register by the holders thereof together with
any other securities the Company is obligated to register pursuant to incidental
registration rights of other security holders of the Company. No registration


                                      -5-

<PAGE>   6

effected under this Section 3.2 shall relieve the Company of its obligation to
effect any Requested Registration under Section 3.1.

                           (b)      Abandonment or Delay. If, at any time after 
the Company has giving written notice of its intention to register any
securities and prior to the effective date of the registration statement filed
in connection with such registration, the Company shall determine not to
register or to delay registration of such securities, the Company may, at its
election, give written notice of such determination and its reasons therefor to
all holders of record of Registrable Securities and (i) in the case of a
determination not to register, shall be relieved of its obligation to register
any Registrable Securities in connection with such registration (but not from
any obligation of the Company to pay the Registration Expenses in connection
therewith) , without prejudice, however, to the rights of any holder or holders
of Registrable Securities entitled to do so to request that such registration be
effected as a registration under Section 3.1, and (ii) in the case of a
determination to delay registering, shall be permitted to delay registering any
Registrable Securities for the same period as the delay in registering such
other securities.

                           (c)      Holder's Right to Withdraw. Each holder of
Registrable Securities shall have the right to withdraw its request for
inclusion of its Registrable Securities in any registration statement pursuant
to this Section 3.2 at any time by giving written notice to the Company of its
request to withdraw.

                           (d)      Unlimited Number of Registrations; Expenses.
There is no limitation on the number of Incidental Registrations which the
Company is obligated to effect pursuant to this Section 3.2. The Company will
pay all Registration Expenses in connection with any registration of Registrable
Securities requested pursuant to this Section 3.2.

                           (e)      Underwriters' Cutback in Incidental 
Registrations. If the managing underwriter of any underwritten offering shall
inform the Company by letter of its belief that the number of Registrable
Securities requested to be included in such registration would materially
adversely affect such offering, then the Company will include in such
registration, first, the securities proposed by the Company to be sold for its
own account and, second, the Registrable Securities and all other securities of
the Company to be included in such registration to the extent of the number and
type which the Company is so advised can be sold in (or during the time of) such
offering, pro rata among the Participating Holders and such other holders
requesting such registration in accordance with the number of Primary Shares and
Option Shares held by (or issuable to) each Participating Holder and each such
other holder so requested to be registered.



                                      -6-

<PAGE>   7

                           (f)     Plan of Distribution. Any participation by 
holders of Registrable Securities in a registration by the Company shall be in
accordance with the Company's plan of distribution.

                  3.3      Registration Procedures. If and whenever the Company 
is required to use its best efforts to effect the registration of any
Registrable Securities under the Securities Act as provided in Sections 3.1 or
3.2 hereof, the Company will as expeditiously as possible:

                           (a)     prepare and file with the Commission as soon 
                  as practicable the requisite registration statement to effect
                  such registration (and shall include all financial statements
                  required by the Commission to be filed therewith) and
                  thereafter use its best efforts to cause such registration
                  statement to become effective; provided, however, that before
                  filing such registration statement (including all exhibits) or
                  any amendment or supplement thereto or comparable statements
                  under securities or blue sky laws of any jurisdiction, the
                  Company shall furnish such documents to the Participating
                  Holders, their counsel, and each underwriter, if any,
                  participating in the offering of the Registrable Securities
                  and its counsel; and provided, further, however, that the
                  Company may discontinue any registration of its securities
                  which are not Registrable Securities at any time prior to the
                  effective date of the registration statement relating thereto;

                           (b)     notify each Participating Holder of the
                  Commission's requests for amending or supplementing the
                  registration statement and the prospectus, and prepare and
                  file with the Commission such amendments and supplements to
                  such registration statement and the prospectus used in
                  connection therewith as may be necessary to keep such
                  registration statement effective and to comply with the
                  provisions of the Securities Act with respect to the
                  disposition of all Registrable Securities covered by such
                  registration statement for such period as shall be required
                  for the disposition of all of such Registrable Securities,
                  provided, that such period need not exceed 90 days;

                           (c)     furnish, without charge, to each
                  Participating Holder such number of conformed copies of such
                  registration statement and of each such amendment and
                  supplement thereto (in each case including all exhibits), such
                  number of copies of the prospectus contained in such
                  registration statement (including each preliminary prospectus
                  and any summary prospectus) and any other prospectus filed
                  under Rule 424 under the Securities Act, in conformity with
                  the requirements of the Securities Act, 



                                      -7-

<PAGE>   8

                  and such other documents, as such Participating Holder may
                  reasonably request;

                           (d)     use its best efforts (i) to register or
                  qualify all Registrable Securities and other securities
                  covered by such registration statement under such securities
                  or blue sky laws of such States of the United States of
                  America where an exemption is not available and as the
                  Participating Holders shall reasonably request, (ii) to keep
                  such registration or qualification in effect for so long as
                  such registration statement remains in effect, and (iii) to
                  take any other action which may be reasonably necessary or
                  advisable to enable such Participating Holders to consummate
                  the disposition in such jurisdictions of the securities to be
                  sold by such Participating Holders, except that the Company
                  shall not for any such purpose be required to qualify
                  generally to do business as a foreign corporation in any
                  jurisdiction wherein it would not but for the requirements of
                  this subsection (d) be obligated to be so qualified or to
                  consent to general service of process in any such
                  jurisdiction;

                           (e)     use its best efforts to cause all Registrable
                  Securities covered by such registration statement to be
                  registered with or approved by such other federal or state or
                  foreign governmental agencies or authorities as may be
                  necessary in the opinion of counsel to the Company and counsel
                  to the Participating Holders to consummate the disposition of
                  such Registrable Securities;

                           (f)     furnish to each Participating Holder and each
                  underwriter, if any, participating in the offering of the
                  securities covered by such registration statement, a signed
                  counterpart of

                                   (i)     an opinion of outside counsel (or 
                           inside counsel if satisfactory to each underwriter)
                           for the Company, and

                                   (ii)    a "comfort" letter signed by the
                           independent public accountants who have certified the
                           Company's financial statements included or
                           incorporated by reference in such registration
                           statement,

                  covering substantially the same matters with respect to such
                  registration statement (and the prospectus included therein)
                  and, in the case of the accountants' comfort letter, with
                  respect to events subsequent to the date of such financial
                  statements, as are customarily covered in opinions of issuer's
                  counsel and in accountants' comfort letters delivered to the
                  underwriters in underwritten public offerings of securities
                  (and dated the dates such 


                                      -8-

<PAGE>   9

                  opinions and comfort letters are customarily dated) and, in
                  the case of the legal opinion, such other legal matters, and,
                  in the case of the accountants' comfort letter, such other
                  financial matters, as the Requisite Percentage of
                  Participating Holders, or the underwriters, may reasonably
                  request;

                           (g)     promptly notify each Participating Holder and
                  each managing underwriter, if any, participating in the
                  offering of the securities covered by such registration
                  statement (i) when such registration statement, any
                  pre-effective amendment, the prospectus or any prospectus
                  supplement related thereto or post-effective amendment to such
                  registration statement has been filed, and, with respect to
                  such registration statement or any post-effective amendment,
                  when the same has become effective; (ii) of any request by the
                  Commission for amendments or supplements to such registration
                  statement or the prospectus related thereto or for additional
                  information; (iii) of the issuance by the Commission of any
                  stop order suspending the effectiveness of such registration
                  statement or the initiation of any proceedings for that
                  purpose; (iv) of the receipt by the Company of any
                  notification with respect to the suspension of the
                  qualification of any of the Registrable Securities for sale
                  under the securities or blue sky laws of any jurisdiction or
                  the initiation of any proceeding for such purpose; (v) at any
                  time when a prospectus relating thereto is required to be
                  delivered under the Securities Act, upon discovery that, or
                  upon the happening of any event as a result of which, the
                  prospectus included in such registration statement, as then in
                  effect, includes an untrue statement of a material fact or
                  omits to state any material fact required to be stated therein
                  or necessary to make the statements therein not misleading, in
                  the light of the circumstances under which they were made, and
                  in the case of this clause (v), at the request of any
                  Participating Holder, promptly prepare and furnish to it and
                  each managing underwriter, if any, participating in the
                  offering of the Registrable Securities a reasonable number of
                  copies of a supplement to or an amendment of such prospectus
                  as may be necessary so that, as thereafter delivered to the
                  purchasers of such securities, such prospectus shall not
                  include an untrue statement of a material fact or omit to
                  state a material fact required to be stated therein or
                  necessary to make the statements therein not misleading in the
                  light of the circumstances under which they were made; and
                  (vi) at any time when the representations and warranties of
                  the Company contemplated by Section 3.4(a) hereof cease to be
                  true and correct;

                           (h)     otherwise comply with all applicable rules 
                  and regulations of the Commission, and make available to its
                  security holders, as soon as reasonably practicable, an
                  earnings statement covering the period of at least 


                                      -9-

<PAGE>   10

                  twelve months beginning with the first full calendar month
                  after the effective date of such registration statement, which
                  earnings statement shall satisfy the provisions of Section
                  11(a) of the Securities Act and Rule 158 promulgated
                  thereunder, and promptly furnish to each such Participating
                  Holder a copy of any amendment or supplement to such
                  registration statement or prospectus;

                           (i)     provide and cause to be maintained a transfer
                  agent and registrar (which, in each case, may be the Company)
                  for all Registrable Securities covered by such registration
                  statement from and after a date not later than the effective
                  date of such registration;

                           (j)     use its best efforts to cause all Registrable
                  Securities covered by such registration statement to be listed
                  on a national securities exchange or to secure designation of
                  all such Registrable Securities as a National Association of
                  Securities Dealers, Inc. Automated Quotation System ("NASDAQ")
                  "national market system security" within the meaning of Rule
                  11Aa2-1 of the Commission, in each case to the extent the
                  shares of the Company's Common Stock are so listed or
                  designated;

                           (k)     deliver promptly to counsel to the
                  Participating Holders and each underwriter, if any,
                  participating in the offering of the Registrable Securities,
                  copies of all correspondence between the Commission and the
                  Company, its counsel or auditors and all memoranda relating to
                  discussions with the Commission or its staff with respect to
                  such registration statement;

                           (1)     make every reasonable effort to obtain the 
                  withdrawal of any order suspending the effectiveness of the
                  registration statement;

                           (m)      provide a CUSIP number for all Registrable 
                  Securities, no later than the effective date of the
                  registration statement; and

                           (n)     make available its employees and personnel
                  and otherwise provide reasonable assistance to the
                  underwriters (taking into account the needs of the Company's
                  businesses) in their marketing of Registrable Securities.

The Company may require each Participating Holder as to the Registrable
Securities of whom any registration is being effected to furnish the Company
such information regarding such holder and the distribution of such securities
as the Company may from time to time reasonably request in writing.


                                      -10-
<PAGE>   11

                  Each holder of Registrable Securities agrees that upon receipt
of any notice from the Company of the happening of any event of the kind
described in subsection (g) (iii) or (v) of this Section 3.3, the Participating
Holder will forthwith discontinue such holder's disposition of Registrable
Securities pursuant to the registration statement relating to such Registrable
Securities until, in the case of subsection (g)(iii) of this Section 3.3, such
stop order is removed or proceedings therefor terminated, and, in the case of
subsection (g)(v) of this Section 3.3, such holder's receipt of the copies of
the supplemented or amended prospectus contemplated by subsection (g)(v) of this
Section 3.3 and, if so directed by the Company, will deliver to the Company (at
the Company's expense) all copies, other than permanent file copies, then in
such holder's possession, of the prospectus relating to such Registrable
Securities current at the time of receipt of such notice.

                  3.4      Underwritten Offerings.

                           (a)      Requested Underwritten Offerings. If 
requested by the underwriters for any underwritten offering by Participating
Holders pursuant to a registration requested under Section 3.1, the Company will
use its best efforts to enter into an underwriting agreement with such
underwriters for such offering, such agreement to be reasonably satisfactory in
substance and form to the Company, each such holder and the underwriters and to
contain such representations and warranties by the Company and such other terms
as are generally prevailing in agreements of that type, including, without
limitation, indemnities to the effect and to the extent provided in Section 3.6
hereof. The Participating Holders will cooperate with the Company in the
negotiation of the underwriting agreement and will give consideration to the
reasonable suggestions of the Company regarding the form thereof. The
Participating Holders shall be parties to such underwriting agreement and may,
at their option, require that any or all of the representations and warranties
by, and the other agreements on the part of, the Company to and for the benefit
of such underwriters shall also be made to and for the benefit of the
Participating Holders and that any or all of the conditions precedent to the
obligations of such underwriters under such underwriting agreement be conditions
precedent to the obligations of the Participating Holders. No Participating
Holder shall be required to make any representations or warranties to or
agreements with the Company or the underwriters other than representations,
warranties or agreements regarding such holder, such holder's ownership of and
title to the Registrable Securities, such holder's intended method of
distribution and any other representations required by law, and any liability of
the Participating Holder to any underwriter or other person under such
underwriting agreement shall be limited to liability arising from misstatements
in or omissions from its representations and warranties and shall be limited to
an amount equal to the net proceeds that the Participating Holder derives from
such registration.


                                      -11-
<PAGE>   12


                           (b)      Incidental Underwritten Offerings. If the 
Company proposes to register any of its securities under the Securities Act as
contemplated by Section 3.2 hereof and such securities are to be distributed by
or through one or more underwriters, the Company will, if requested by any
Participating Holder, use its best efforts to arrange for such underwriters to
include all the Registrable Securities to be offered and sold by such
Participating Holder among the securities of the Company to be distributed by
such underwriters. The Participating Holders shall be parties to the
underwriting agreement between the Company and such underwriters and may, at
their option, require that any or all of the representations and warranties by,
and the other agreements on the part of, the Company to and for the benefit of
such underwriters shall also be made to and for the benefit of such
Participating Holders and that any or all of the conditions precedent to the
obligations of such underwriters under such underwriting agreement be conditions
precedent to the obligations of such Participating Holders. No Participating
Holder shall be required to make any representations or warranties to or
agreements with the Company or the underwriters other than representations,
warranties or agreements regarding such holder, such holder's ownership of and
title to the Registrable Securities, such holder's intended method of
distribution and any other representations required by law, and any liability of
the Participating Holder to any underwriter or other person under such
underwriting agreement shall be limited to liability arising from misstatements
in or omissions from its representations and warranties and shall be limited to
an amount equal to the net proceeds that the Participating Holder derives from
such registration.

                  3.5      Preparation; Reasonable Investigation. In connection
with the preparation and filing of each registration statement under the
Securities Act pursuant to this Agreement, the Company will give the
Participating Holders, their underwriters, if any, and their respective counsel
and accountants the opportunity to participate in the preparation of such
registration statement, each prospectus included therein or filed with the
Commission, and, to the extent practicable, each amendment thereof or supplement
thereto, and give each of them such access to its books and records and such
opportunities to discuss the business of the Company with its officers and
employees and the independent public accountants who have certified its
financial statements as shall be necessary, in the opinion of such holders' and
such underwriters' respective counsel, to conduct a reasonable investigation
within the meaning of the Securities Act.

                  3.6      Indemnification.

                           (a)      Indemnification by the Company. In the event
of any registration of any securities of the Company under the Securities Act,
the Company will, and hereby does, indemnify and hold harmless, to the fullest
extent permitting by law, each Participating Holder, its directors, officers,
partners, agents and affiliates or general and limited partners (and the
directors, officers, employees, stockholders and affiliates



                                      -12-

<PAGE>   13

thereof), and each other Person who participates as an underwriter in the
offering or sale of such securities and each other Person, if any, who
controls such Participating Holder or any such underwriter within the meaning
of the Securities Act, against any losses, claims, damages, or liabilities,
joint or several (or actions or proceedings, whether commenced or threatened)
to which such Participating Holder or any such director, officer, partner,
agent or affiliate or underwriter or controlling person may become subject
under the Securities Act or otherwise, insofar as such losses, claims,
damages or liabilities, joint or several (or actions or proceedings, whether
commenced or threatened, in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
any registration statement under which such securities were registered under the
Securities Act, any preliminary prospectus, final prospectus or summary
prospectus contained therein, or any amendment or supplement thereto, together
with the documents incorporated by reference therein, or any omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein in light of the circumstances in which
they were made not misleading, and the Company will reimburse such Participating
Holder and each such director, officer, partner, agent or affiliate, or general
or limited partner, underwriter and controlling Person for any legal or any
other expenses reasonably incurred by them in connection with investigating or
defending any such loss, claim, liability, action or proceeding; provided, that
the Company shall not be liable in any such case to the extent that any such
loss, claim, damage, liability (or action or proceeding in respect thereof) or
expense arises out of or is based upon an untrue statement or alleged untrue
statement or omission or alleged omission made in such registration statement,
any such preliminary prospectus, final prospectus, summary prospectus, amendment
or supplement in reliance upon and in conformity with written information
furnished to the Company through an instrument duly executed by or on behalf of
such Participating Holder or underwriter, as the case may be, specifically
stating that it is for use in the preparation thereof; and provided, further,
that the Company shall not be liable to any Person who participates as an
underwriter in the offering or sale of Registrable Securities or any other
Person, if any, who controls such underwriter within the meaning of the
Securities Act, in any such case to the extent that any such loss, claim,
damage, liability (or action or proceeding in respect thereof) or expense arises
out of such Person's failure to send or give a copy of the final prospectus, as
the same may be then supplemented or amended, to the Person asserting an untrue
statement or alleged untrue statement or omission or alleged omission at or
prior to the written confirmation of the sale of Registrable Securities to such
Person if such statement or omission was corrected in such final prospectus.
Such indemnity shall remain in full force regardless of any investigation made
by or on behalf of such Participating Holder or any such director, officer,
partner, agent or affiliate or controlling Person and shall survive the transfer
of such securities by such Participating Holder.


                                      -13-
<PAGE>   14

                           (b)      Indemnification by the Participating 
Holders. As a condition to including any Registrable Securities in any
registration statement, the Company shall have received an undertaking
satisfactory to it from the Participating Holders to indemnify and hold harmless
(in the same manner and to the same extent as set forth in subsection (a) of
this Section 3.6) the Company, each director and officer of the Company, and
each other Person, if any, who controls the Company within the meaning of the
Securities Act, with respect to any statement or alleged statement in or
omission or alleged omission from such registration statement, any preliminary
prospectus, final prospectus or summary prospectus contained therein, or any
amendment or supplement thereto, but only if such statement or alleged statement
or omission or alleged omission was made in reliance upon and in conformity with
written information furnished to the Company through an instrument duly executed
by such Participating Holder specifically stating that it is for use in the
preparation of such registration statement, preliminary prospectus, final
prospectus, summary prospectus, amendment or supplement; provided, however, that
the liability of such indemnifying party under this Section 3.6(b) shall be
limited to the amount of net proceeds received by such indemnifying party in the
offering giving rise to such liability. Such indemnity shall remain in full
force and effect, regardless of any investigation made by or on behalf of the
Company or any such director, officer or controlling person and shall survive
the transfer of such securities by the Participating Holder.

                           (c)      Notices of Claims, etc.  Promptly after 
receipt by an indemnified party of notice of the commencement of any action or
proceeding involving a claim referred to in the preceding subsections of this
Section 3.6, such indemnified party will, if a claim in respect thereof is to be
made against an indemnifying party, give written notice to the latter of the
commencement of such action or proceeding; provided, however, that the failure
of any indemnified party to give notice as provided herein shall not relieve the
indemnifying party of its obligations under the preceding subsections of this
Section 3.6, except to the extent that the indemnifying party is materially
prejudiced by such failure to give notice, and shall not relieve the
indemnifying party from any liability which it may have to the indemnified party
otherwise than under this Section 3.6. In case any such action or proceeding is
brought against an indemnified party, the indemnifying party shall be entitled
to participate therein and, unless in the opinion of outside counsel to the
indemnified party a conflict of interest between such indemnified and
indemnifying parties may exist in respect of such claim, to assume the defense
thereof, jointly with any other indemnifying party similarly notified to the
extent that it may wish, with counsel reasonably satisfactory to such
indemnified party; provided, however, that if the defendants in any such action
or proceeding include both the indemnified party and the indemnifying party and
if in the opinion of outside counsel to the indemnified party there may be legal
defenses available to such indemnified party 


                                      -14-
<PAGE>   15

and/or other indemnified parties which are different from or in addition to
those available to the indemnifying party, the indemnified party or parties
shall have the right to select separate counsel to defend such action or
proceeding on behalf of such indemnified party or parties, provided, further,
that the indemnifying party shall be obligated to pay for only one counsel for
all indemnified parties. After notice from the indemnifying party to such
indemnified party of its election so to assume the defense thereof and approval
by the indemnified party of such counsel, the indemnifying party shall not be
liable to such indemnified party for any legal expenses subsequently incurred by
the latter in connection with the defense thereof other than reasonable costs of
investigation (unless the first proviso in the preceding sentence shall be
applicable). No indemnifying party shall be liable for any settlement of any
action or proceeding effected without its written consent. No indemnifying party
shall, without the consent of the indemnified party, consent to entry of any
judgment or enter into any settlement which does not include as an unconditional
term thereof the giving by the claimant or plaintiff to such indemnified party
of a release from all liability in respect to such claim or litigation.

                           (d)      Contribution. If the indemnification 
provided for in this Section 3.6 shall for any reason be held by a court to be
unavailable to an indemnified party under subsection (a) or (b) hereof in
respect of any loss, claim, damage or liability, or any action in respect
thereof, then, in lieu of the amount paid or payable under subsection (a) or (b)
hereof, the indemnified party and the indemnifying party under subsection (a) or
(b) hereof shall contribute to the aggregate losses, claims, damages and
liabilities (including legal or other expenses reasonably incurred in connection
with investigating the same), (i) in such proportion as is appropriate to
reflect the relative fault of the Company and the Participating Holders which
resulted in such loss, claim, damage or liability, or action in respect thereof,
with respect to the statements or omissions which resulted in such loss, claim,
damage or liability, or action in respect thereof, as well as any other relevant
equitable considerations or (ii) if the allocation provided by clause (i) above
is not permitted by applicable law, in such proportion as shall be appropriate
to reflect not only the relative fault but also the relative benefits received
by the Company and the Participating Holders from the offering of the securities
covered by such registration statement as well as any other relevant equitable
considerations. The parties hereto agree that it would not be just and equitable
if contributions pursuant to this Section 3.6(d) were to be determined by pro
rata allocation or by any other method of allocation which does not take account
of the equitable considerations referred to above. No Person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any Person who was not
guilty of such fraudulent misrepresentation. The Participating Holders'
obligations to contribute as provided in this subsection (d) are several and not
joint in proportion to the relative value of their respective Registrable
Securities covered by such registration statement. In 


                                      -15-
<PAGE>   16

addition, no Person shall be obligated to contribute hereunder any amounts in
payment for any settlement of any action or claim effected without such Person's
consent, which consent shall not be unreasonably withheld. Notwithstanding
anything in this subsection (d) to the contrary, no indemnifying party (other
than the Company) shall be required to contribute any amount in excess of the
net proceeds received by such party from the sale of the Registrable Securities
in the offering to which the losses, claims, damages or liabilities of the
indemnified parties relate.

                           (e)      Other Indemnification. Indemnification and 
contribution similar to that specified in the preceding subsections of this
Section 3.6 (with appropriate modifications) shall be given by the Company and
each Participating Holder with respect to any required registration or other
qualification of securities under any federal or state law or regulation of any
governmental authority other than the Securities Act. The indemnification
agreements contained in this Section 3.6 shall be in addition to any other
rights to indemnification or contribution which any indemnified party may have
pursuant to law or contract and shall remain operative and in full force and
effect regardless of any investigation made by or on behalf of any indemnified
party and shall survive the transfer of any of the Registrable Securities by any
of the Participating Holders.

                           (f)      Indemnification Payments. The 
indemnification and contribution required by this Section 3.6 shall be made by
periodic payments of the amount thereof during the course of the investigation
or defense, as and when bills are received or expense, loss, damage or liability
is incurred.

                  3.7      Certain Rights of the Investor If Named in a 
Registration Statement. If any statement contained in a registration statement
under the Securities Act or in any filing under the state securities laws of any
jurisdiction refers to the Investor by name or otherwise as the holder of any
securities of the Company, then the Investor shall have the right to require (i)
the insertion therein of language, in form and substance satisfactory to the
Investor, to the effect that the holding by the Investor of such securities does
not necessarily make the Investor a "controlling person" of the Company within
the meaning of the Securities Act and is not to be construed as a recommendation
by the Investor of the investment quality of the Company's debt or equity
securities covered thereby and that such holding does not imply that the
Investor will assist in meeting any future financial requirements of the Company
or (ii) in the event that such reference to the Investor by name or otherwise is
not, in the reasonable judgment of the Investor as advised by its counsel,
required by the Securities Act or any of the rules and regulations promulgated
thereunder, or any state securities laws of any jurisdiction, the deletion of
the reference to such Investor.



                                      -16-


<PAGE>   17

                  3.8      Unlegended Certificates. In connection with the
offering of any Registrable Securities registered pursuant to this Article 3,
the Company shall (i) facilitate the timely preparation and delivery to
Participating Holders and the underwriters, if any, participating in such
offering, of unlegended certificates representing ownership of such Registrable
Securities being sold in such denominations and registered in such names as
requested by such Participating Holders or such underwriters and (ii) instruct
any transfer agent and registrar of such Registrable Securities to release any
stop transfer orders with respect to any such Registrable Securities.

                  3.9      Limitation on Sale or Distribution of Other
Securities. The Company hereby agrees that, if it shall previously have received
a request for registration pursuant to Section 3.1 or 3.2 hereof, and if such
previous registration shall not have been withdrawn or abandoned, (i) the
Company shall not effect any public or private offer, sale or other distribution
of its securities or effect any registration of any of its equity securities
under the Securities Act (subject to the provisions of Section 3.2 hereof)
(other than a registration on Form S-8 or any successor or similar form which is
then in effect), whether or not for sale for its own account, until a period of
90 days (or such shorter period as the Requisite Majority of Participating
Holders shall agree) shall have elapsed from the effective date of such previous
registration (and the Company shall so provide in any registration rights
agreements hereafter entered into with respect to any of its securities); and
(ii) the Company shall use its best efforts to cause each holder of its equity
securities purchased from the Company at any time after the date of this
Agreement other than in a public offering to agree not to effect any public sale
or distribution of any such securities during such period, including a sale
pursuant to Rule 144 under the Securities Act.

                  3.10     No Required Sale. Nothing in this Agreement shall be
deemed to create an independent obligation on the part of any Participating
Holder to sell any Registrable Securities pursuant to any effective registration
statement.

         4.       Rule 144. The Company shall take all actions reasonably
necessary to enable holders of Registrable Securities to sell such securities
without registration under the Securities Act within the limitation of the
exemptions provided by (a) Rule 144, or (b) any similar rule or regulation
hereafter adopted by the Commission including, without limiting the generality
of the foregoing, filing on a timely basis all reports required to be filed by
the Exchange Act. Upon the request of any holder of Registrable Securities, the
Company will deliver to such holder a written statement as to whether it has
complied with such requirements.

         5.       Amendments and Waivers. This Agreement may be amended with the
consent of (i) the Company and (ii) the holders of at least 51% of the
outstanding Primary 


                                      -17-
<PAGE>   18


Shares and Option Shares, as a group (assuming that the exercisable portion (if
any) of the First Option and the exercisable portion (if any) of the Second
Option are converted into Option Shares but excluding any Primary Shares or
Option Shares that are no longer Registerable Securities). The Company may take
any action herein prohibited, or omit to perform any act herein required to be
performed by it, in each case only if the Company shall have obtained the
written consent to such action or omission to act, of holders of at least 51% of
the outstanding Primary Shares and Option Shares, as a group (assuming that the
exercisable portion (if any) of the First Option and the exercisable portion (if
any) of the Second Option are converted into Option Shares but excluding any
Primary Shares or Option Shares that are no longer Registerable Securities).
Each holder of any Registrable Securities at the time or thereafter outstanding
shall be bound by any consent authorized by this Section 5, whether or not such
Registrable Securities shall have been marked to indicate such consent.

         6.       Nominees for Beneficial Owners. In the event that any
Registrable Securities are held by a nominee for the beneficial owner thereof,
the beneficial owner thereof may, at its election in writing delivered to the
Company (accompanied by a written acknowledgment of, and consent to, such
election by such nominee), be treated as the holder of such Registrable
Securities for purposes of any request or other action by any holder or holders
of Registrable Securities pursuant to this Agreement or any determination of any
number or percentage of shares of Registrable Securities held by any holder or
holders of Registrable Securities contemplated by this Agreement. If the
beneficial owner of any Registrable Securities so elects to be treated as the
holder of such Registrable Securities, the Company may require assurances
reasonably satisfactory to it of such owner's beneficial ownership of such
Registrable Securities.

         7.       Notices. All communications provided for hereunder shall be
personally delivered or sent by telecopier (and confirmed by telephone) or by a
reputable overnight courier, and shall be addressed as follows:

                  (a)    if to the Investor, addressed to it in the manner set
forth in the Purchase Agreement, or at such other address as it shall have
furnished to the Company in writing;

                  (b)    if to any other holder of Registrable Securities, at
the address that such holder shall have furnished to the Company in writing, or,
until any such other holder so furnishes to the Company an address, then to and
at the address of the last holder of such Registrable Securities who has
furnished an address to the Company; or



                                      -18-

<PAGE>   19

                  (c)    if to the Company, addressed to it in the manner set
forth in the Purchase Agreement, or at such other address as the Company shall
have furnished to each holder of Registrable Securities at the time outstanding.

         8.       Assignment. This Agreement shall be binding upon and inure to
the benefit of and be enforceable by the parties hereto and their respective
successors and permitted assigns. This Agreement may not be assigned by the
Company. This Agreement and/or the registration and other rights contained
herein (including these assignment rights) may be assigned by the Investor to
any one or more transferees or distributees of all or part of such Investor's
Registrable Securities. A holder of Registrable Securities shall be permitted,
in connection with a transfer or disposition of Registrable Securities, to
impose conditions or constraints on the ability of the transferee, as a holder
of Registrable Securities, to request a registration pursuant to Section 3.1 and
shall provide the Company with copies of such conditions or constraints and the
identity of such transferees. Notwithstanding the foregoing, this Agreement
and/or the registration and other rights contained herein may not be assigned to
a transferee or distributee who, immediately following such transfer or
distribution, owns less than one percent of the Company's outstanding Common
Stock.

         9.      Remedies. Each holder of Registrable Securities, in addition to
being entitled to exercise all rights provided herein or granted by law,
including recovery of damages, will be entitled to specific performance of its
rights under this Agreement. The Company agrees that monetary damages would not
be adequate compensation for any loss incurred by reason of a breach by it of
the provisions of this Agreement and hereby agrees to waive the defense in any
action for specific performance that a remedy at law would be adequate. In any
action or proceeding brought to enforce any provision of this Agreement
(including the indemnification provisions thereof), the successful party shall
be entitled to recover reasonable attorneys' fees in addition to its costs and
expenses and any other available remedy.

         10.     No Inconsistent Agreements. The Company will not, on or after
the date of this Agreement, enter into any agreement with respect to its
securities which is inconsistent with the rights granted to the holders of
Registrable Securities in this Agreement or otherwise conflicts with the
provisions hereof. The Company has not previously entered into any agreement
with respect to its securities granting any registration rights to any Person
other than the registration rights granted pursuant to this Agreement. The
rights granted to the holders of Registrable Securities hereunder do not in any
way conflict with and are not inconsistent with any other agreements to which
the Company is a party or by which it is bound. The Company further agrees that
if any other registration rights agreement entered into after the date of this
Agreement with respect to any of its securities contains terms which are more
favorable to, or less 


                                      -19-
<PAGE>   20

restrictive on, the other party thereto than the terms and conditions contained
in this Agreement are (insofar as they are applicable) to the Investor, then the
terms and conditions of this Agreement shall immediately be deemed to have been
amended without further action by the Company or any of the holders of
Registrable Securities so that such holders shall be entitled to the benefit of
any such more favorable or less restrictive terms or conditions.

         11.      Descriptive Headings. The descriptive headings of the several
sections and paragraphs of this Agreement are inserted for reference only and
shall not limit or otherwise affect the meaning hereof.

         12.      Governing Law; Submission to Jurisdiction; Waiver of Jury
Trial. This Agreement shall be construed and enforced in accordance with, and
the rights of the parties shall be governed by, the laws of the State of
Delaware, without regard to the conflicts of laws principles thereof. Each of
the parties hereto hereby irrevocably and unconditionally consents to submit to
the exclusive jurisdiction of the courts of the State of Delaware and the United
States of America located in Wilmington, Delaware for any action or proceeding
arising out of or relating to this Agreement and the transactions contemplated
hereby (and agrees not to commence any action or proceeding relating thereto
except in such courts). Each of the parties hereto hereby irrevocably and
unconditionally waives any objection to the laying of venue of any action or
proceeding arising out of this Agreement or the transactions contemplated hereby
in the courts of the State of Delaware or the United States of America located
in Wilmington, Delaware, and hereby further irrevocably and unconditionally
waives and agrees not to plead or claim in any such court that any such action
or proceeding brought in any such court has been brought in an inconvenient
forum. The Company hereby waives any right it may have to a trial by jury in
respect of any action, proceeding or litigation directly or indirectly arising
out of, under or in connection with, this Agreement.

         13.      Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all such
counterparts shall together constitute one and the same instrument.


                                      -20-
<PAGE>   21

        IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered by their respective officers thereunto duly authorized as
of the date first above written.

                             THE UNIMARK GROUP, INC.


                             By: /s/ Rafael Vaquero Bazan
                                 ------------------------
                                 Name:      Rafael Vaquero Bazan
                                 Title:     President, Chief Executive Officer 
                                            and Chief Operating Officer





                             M & M NOMINEE L.L.C.


                             By: /s/ Peter Streinger
                                 -------------------
                                 Name:      Peter Streinger
                                 Title:     Manager



<PAGE>   1
                                                                    EXHIBIT 99.7





                             SHAREHOLDERS AGREEMENT

             SHAREHOLDERS AGREEMENT (this "Shareholders Agreement") dated as of
July 17, 1998, by and among M & M NOMINEE L.L.C., a Delaware limited liability
company ("Purchaser"), Rafael Vaquero Bazan and Fernando Camacho Casas
(collectively, the "Executives"). Certain terms used herein are defined in
Section 10.

                               W I T N E S S E T H

             WHEREAS, contemporaneously herewith and conditioned hereon,
Purchaser and The UniMark Group, Inc. (the "Company") are entering into a
Purchase Agreement (the "Purchase Agreement") providing for the issuance by the
Company and the purchase by Purchaser of shares of common stock, par value $0.01
per share, of the Company (the "Common Stock"); and

             WHEREAS, the Executives and Purchaser desire to provide for certain
rights and restrictions with regard to their respective ownership of Common
Stock.

             NOW, THEREFORE, in consideration of the mutual covenants herein
contained, the parties agree as follows:

1.       Restriction of Sale. (a) From the date hereof until the 18 month 
anniversary hereof, the Executives shall not sell, transfer, assign, exchange,
pledge, encumber or otherwise dispose of (each, a "Transfer") any shares of
Common Stock that they now own or hereafter acquire or grant any option or right
to purchase such shares or any legal or beneficial interest therein, except in
accordance with the provisions of this Shareholders Agreement. Notwithstanding
the foregoing, nothing herein shall prevent either Executive from effecting a
transfer of Common Stock if he is required to do so pursuant to either the
Margin Agreement between Rafael Vaquero Bazan and Everen Securities, Inc. or the
Margin Agreement between Fernando Camacho Casas and First London Securities
Corporation.

         (b)      Notwithstanding the provisions of Section 1(a), the Executives
may Transfer shares of Common Stock as follows:

                  (i)    each Executive may sell up to 25% of his shares of 
         Common Stock in a broadly distributed bona fide public offering of
         Common Stock pursuant to the Securities Act of 1933, as amended or in
         regular broker transactions pursuant to Rule 144A promulgated
         thereunder;
<PAGE>   2

                  (ii)   each Executive may Transfer his shares of Common Stock
         with the prior written consent of Purchaser; and

                  (iii)  each Executive may Transfer his shares to a member of
         his immediate family;

provided, however, that in the case of clauses (ii) and (iii) the transferee in
such Transfer agrees in writing to be bound by all the terms of this
Shareholders Agreement (such transferee being herein referred to as the
"Permitted Transferee") applicable to the Executive as if the Permitted
Transferee originally had been a party hereto.

         (c)      From the date hereof until the first anniversary of the date
hereof, Purchaser may not Transfer any shares of Common Stock except to an
Affiliate of Purchaser who agrees to be bound by the provisions hereof as if
such Affiliate transferee were originally a party hereto. At any time before, on
or after the first anniversary hereof, Purchaser shall not transfer any shares
of Common Stock to an Affiliate without causing such Affiliate to agree in
writing to be bound by the provisions hereof as if such Affiliate were
originally a party hereto.

2.       Buy - Sell Arrangement. (a) At any time after the first anniversary of
the date hereof, but only for so long as both a Governance Termination Event and
a Principal Termination Event have not occurred, if either group believes, in
its good faith judgment that a bona fide dispute exists between the Groups, then
such Group (the "Initiating Group"), by written notice (the "Notice") to the
other Group (the "Other Group"), may initiate a buy-sell option (the "Option")
subject to the terms and conditions set forth below.

         (b)      The Initiating Group may initiate the Option only if the
holders of at least 75% of its Specified Shares approve such initiation. All
other actions taken with respect to the Option by a Group shall require the
approval of the holders of at least a majority of its Specified Shares.

         (c)      The Notice shall specify a price per share (or other security)
for all of the Specified Shares owned by the Other Group. The Other Group shall
have the irrevocable Option to elect either (i) to sell (the "Sale Option") to
the Initiating Group (or its designee) all of the Specified Shares owned by the
Other Group at the date of receipt of the Notice (the "Receipt Date") at the
price per share (or other security) set forth in the Notice or (ii) to purchase
(the "Purchase Option") all of the Specified Shares owned by the Initiating
Group on the Receipt Date at the price per share (or other security) set forth
in the Notice. Such election, which shall be irrevocable, shall be


                                      -2-
<PAGE>   3

made by written notice from the Other Group to the Initiating Group within 15
days of the Receipt Date, provided however if the Other Group fails to duly make
an election in this time period, it shall conclusively be deemed to have elected
the Sale Option.

         (d)      The closing (the "Closing") of the purchase and sale under the
Sale Option or the Purchase Option shall take place at the offices of the
Company on a date specified in writing on at least 5 business days' notice by
the Group purchasing the Specified Shares (the "Buying Group") to the Group
selling its Specified Shares (the "Selling Group"), but in any event within 45
days of the Receipt Date (subject to adjournment if and to the extent necessary
to obtain any necessary governmental approvals or to satisfy any legal waiting
periods). The purchase price shall be payable by the Buying Group (or its
designee) to the Selling Group in U.S. dollars in cash or immediately available
funds at the Closing. At the Closing, the Selling Group shall transfer its
Specified Shares to the Buying Group (or its designee) and shall deliver such
Specified Shares to the Buying Group (or its designee), with appropriate
instruments of transfer, free and clear of any lien, claim or encumbrance.
Pending the Closing, the Specified Shares of the Selling Group shall be voted by
the Buying Group, and appropriate proxies shall be promptly delivered to
effectuate this agreement.

         (e)      Each Group shall execute and deliver such instruments and
agreements, and shall take such actions, as may be reasonably requested by the
other Group to carry out the purposes of this Section 2.

3.       Agreement Not to Compete. (a) Each of the Executives agrees that for so
long as he is employed by, or a director of, the Company or a subsidiary of the
Company, and for 18 months thereafter, he will not (i) engage in any
"Competitive Activity," as defined below, within the world (including, without
limitation, anywhere in the United States of America) or (ii) directly or
indirectly solicit for employment, including, without limitation, recommending
to any subsequent employer the solicitation for employment of, any employee of
the Company.

         (b)      Each of the Executives represents and agrees that he has not
and, for so long as he is employed by or a director of the Company or a
subsidiary of the Company, and for three years thereafter, he will not,
appropriate for his own use, disclose to any third party, or authorize anyone
else to disclose, unless authorized by the Company, any secret, confidential,
proprietary or financial information concerning the operations, future plans,
methods of doing business, or financial condition of the Company or any
subsidiary or Affiliate thereof, or any customer lists, customer files or other
information relating to the customers of the Company, or any Subsidiary or
affiliate thereof that he obtained as a result of which his employment with the
Company and which is not 


                                      -3-
<PAGE>   4

otherwise publicly available (unless it became publicly available in violation
of this Section 3(c)).

         (c)      Should a court of competent jurisdiction determine that any
provision of this Section 3 is unenforceable, in period of time, geographical
area, or otherwise, the parties hereto agree that the provision shall be
interpreted and enforced to the maximum extent which such court deems
enforceable.


4.       Severability. Any term, provision, covenant or restriction contained in
this Shareholders Agreement held by a court or other governmental authority of
competent jurisdiction to be invalid, void or unenforceable shall be ineffective
to the extent of such invalidity, voidness or unenforceability, but neither the
remaining terms, provisions, covenants or restrictions contained in this
Shareholders Agreement nor the validity or enforceability thereof in any other
jurisdiction shall be affected or impaired thereby. Any term, provision,
covenant or restriction contained in this Shareholders Agreement that is so
found to be so broad as to be unenforceable shall be interpreted to be as broad
as is enforceable.

5.       Successors; No Third Party Beneficiaries. The terms and conditions of
this Shareholders Agreement shall inure to the benefit of and be binding upon
the parties hereto and their respective successors and assigns. Nothing in this
Shareholders Agreement, expressed or implied, is intended to confer upon any
party, other than the parties hereto, and their respective successors and
assigns, any rights, remedies, obligations, or liabilities under or by reason of
this Shareholders Agreement, except as expressly provided herein.

6.       Notices. All notices or other communications which are required or
permitted hereunder shall be in writing and delivered personally, or sent by
telecopier or reputable overnight courier and delivered to the applicable
address as follows:

                  If to Rafael Vaquero Bazan, to him at:

                  Industrias Citricolas de Montemorelos, S.A. de C.V.
                  Carretera General Teran Kilometro 1
                  Apartado 87
                  Montemorelos, N.L., Mexico C.P 67500
                  Telecopier: (826) 3-44-17



                                      -4-
<PAGE>   5

                  with a copy to:

                  Jakes Jordaan, Esq.
                  Jordaan & Pennington
                  300 Crescent Court, Suite 1605
                  Dallas, TX 75201
                  Telecopier: (214) 871-6560

                  If to Fernando Camacho Casas, to him at:

                  Operadora Agros, S.A. de C.V.
                  Rio Neva 17
                  Col. Cuauthemoc
                  06500 - Mexico, D.F.
                  Telecopier: 566-7026

                  with a copy to:

                  Jakes Jordaan, Esq.
                  Jordaan & Pennington
                  300 Crescent Court, Suite 1605
                  Dallas, TX 75201
                  Telecopier: (214) 871-6560

                  If to Purchaser, to:

                  M & M Nominee L.L.C.
                  c/o Soros Fund Managment
                  888 Seventh Avenue
                  New York, NY  10106
                  Attention: Chief Financial Officer
                  Telecopier: (212) 974-8399

                  with a copy to:

                  Promecap, S.C.
                  Bosque de Alisos No. 47A, 3er piso
                  Colonia Bosques de las Lomas
                  C.P. 05120 Mexico, D.F.
                  Mexico
                  Attention: Federico Chavez Peon
                  Telecopier: 011-525-259-6269


                                      -5-
<PAGE>   6


                  with a copy to:

                  Joseph Stern, Esq.
                  Fried, Frank, Harris, Shriver & Jacobson
                  One New York Plaza
                  New York, New York  10004
                  Telecopier: (214) 859-4000


7.       Specific Performance. The parties hereto agree that if for any reason
Purchaser or the Company shall have failed to perform its obligations under this
Shareholders Agreement, then either party hereto seeking to enforce this
Shareholders Agreement against such non-performing party shall be entitled to
specific performance and injunctive and other equitable relief, and the parties
hereto further agree to waive any requirement for the securing or posting of any
bond in connection with the obtaining of any such injunctive or other equitable
relief. This provision is without prejudice to any other rights that either
party hereto may have against the other party hereto for any failure to perform
its obligations under this Shareholders Agreement.

8.       Governing Law. This Shareholders Agreement shall be governed by the
laws of the State of Delaware, without giving effect to the conflict of laws
principles thereof. Each party hereby irrevocably and unconditionally consents
to submit to the exclusive jurisdiction of the courts of the State of Delaware
and of the United States of America located in Wilmington, Delaware, for any
Litigation (and agrees not to commence any Litigation except in any such court).
Each party hereby irrevocably and unconditionally waives any objection to the
laying of venue of any Action in the courts of the State of Delaware or of the
United States of America located in Wilmington, Delaware, and hereby further
irrevocably and unconditionally waives and agrees not to plead or claim in any
such court that any Action brought in any such court has been brought in an
inconvenient forum.

9.       Waiver and Amendment. Any provision of this Shareholders Agreement may
be waived in writing at any time by the party that is entitled to the benefits
of such provision. This Shareholders Agreement may not be modified, amended,
altered or supplemented except upon the execution and delivery of a written
agreement executed by the Purchaser and the Executives.

10.      Defined Terms. As used herein, the following terms shall be defined as
follows:


                                      -6-
<PAGE>   7

         "Affiliate" shall mean, with respect to any Person, any other Person
that directly or indirectly controls, is controlled by, or is under common
control with such Person.

         "Competitive Activity" shall mean engaging in any of the following
activities: (i) serving as a director of any Competitor; (ii) directly or
indirectly (x) controlling any Competitor or (y) owning any equity or debt
interests in any Competitor (other than equity or debt interests which are
publicly traded and do not exceed 2% of the particular class of interests then
outstanding) (it being understood that, if any such interests in any Competitor
are owned by an investment vehicle or other entity in which the Employee owns an
equity interest, a portion of the interests in such Competitor owned by such
entity shall be attributed to the Employee, such portion determined by applying
the percentage of the equity interest in such entity owned by the Employee to
the interests in such Competitor owned by such entity); (iii) directly or
indirectly soliciting, diverting, taking away, appropriating or otherwise
interfering with any of the customers or suppliers of the Company or any
Affiliate controlled by the Company; or (iv) employment by (including serving as
an officer of), or providing consulting services to, any Competitor.

         "Competitor" shall mean any Person that is engaged in a business
similar to any of the businesses currently or hereafter conducted by the Company
or its subsidiaries (but not including businesses the Company enters into after
the Executive is no longer an employee or director of the Company or any of its
subsidiaries).

         "control" (and the correlative term "controlling") shall mean the
possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of any Person, whether through the
ownership of equity interests, by contract or otherwise.

         "Governance Termination Event" shall be deemed to have occurred when
either (i) the Purchase Agreement has been amended or Purchaser has waived
compliance therewith, or (ii) Purchaser's ownership of Common Stock has fallen,
in either event such that the Company is not obliged to observe the covenants
set forth in Section 4.1 and 4.10 of the Purchase Agreement.

         "Group" shall mean the Purchaser Group or the Principal Group.

         "Person" shall mean an individual, a corporation, a limited liability
company, a partnership, an association, a trust or any other entity or
organization, including a governmental entity.

         "Principal Group" shall mean the Executives and any Permitted 
Transferees who own any Principal Shares.




                                      -7-

<PAGE>   8

         "Principal Shares" shall mean the 927,801 shares of Common Stock owned
by the Executives as of the date hereof, including any securities issued in
respect thereof as a dividend or stock-split or in a reorganization, merger,
reclassification or otherwise, but excluding any shares of Common Stock
Transferred other than to a Permitted Transferee.

         A "Principal Termination Event" shall be deemed to have occurred when
(i) the Principal Group Transfers (other than to Permitted Transferees) more
than 50% of the Principal Shares owned by the Principals as of the date hereof
(adjusted for any stock splits, stock dividends, recapitalizations and similar
transactions), or (ii) neither Executive is a senior executive or director of
the Company.

         "Purchaser Group" shall mean Purchaser and any Affiliates of Purchaser 
who own any Purchaser Shares.

         "Purchaser Shares" shall mean the shares of Common Stock acquired
pursuant to the Purchase Agreement or the Option Agreement, dated as of the date
hereof, between Purchaser and the Company, including any securities issued in
respect thereof as a dividend or stock-split or in a reorganization, merger,
reclassification or otherwise, but excluding any shares Transferred by Purchaser
other than to Affiliates of Purchaser who agree to be bound by the terms hereof.

         "Specified Shares" shall, at any time, mean with respect to (i) the
Purchaser Group, the Purchaser Shares then owned by the Purchaser Group, and
(ii) the Principal Group, the Principal Shares then owned by the Principal
Group.

         "subsidiary" shall mean, with respect to any Person, any other Person
more than 10% of whose outstanding capital stock or equity interests is owned
directly or indirectly by such Person.



                                      -8-
<PAGE>   9

             IN WITNESS WHEREOF, each of the parties hereto has executed this
Shareholders Agreement as of the date first written above.

                                               PURCHASER:

                                               M & M NOMINEE L.L.C.


                                               By: /s/ Peter Streinger
                                                   -------------------
                                                   Name:  Peter Streinger
                                                   Title: Manager


                                               THE EXECUTIVES:



                                               /s/ Rafael Vaquero Bazan
                                               -------------------------
                                               Rafael Vaquero Bazan


                                               /s/ Fernando Camacho Casas
                                               -------------------------
                                               Fernando Camacho Casas




                                      -9-
<PAGE>   10




             The undersigned partnership agrees to be bound, as if it were an
Executive, by the provisions of the foregoing agreement with respect to the
shares of the Company that it owns.

                                            GARZA JASSO Y ASOCIADOS


                                            By: /s/ Rafael Vaquero Bazan
                                                ------------------------
                                                Name:  Rafael Vaquero Bazan
                                                Title: General Partner

             The undersigned company agrees to be bound, as if it were an
Executive, by the provisions of the foregoing agreement with respect to the
shares of the Company that it owns.

                                            AGROS S.A. DE CV SOCIEDAD DE 
                                            INVESATOR DE CAPITALES


                                            By: /s/ Fernando Camacho Casas
                                                --------------------------
                                                Name:  Fernando Camacho Casas
                                                Title: General Director




                                      -10-

<PAGE>   1
                                                                    EXHIBIT 99.8



[UNIMARK GROUP LOGO]


                               THE UNIMARK GROUP
================================================================================

For Immediate Release              For Further Information, Contact:
July 20, 1998                      Rafael Vaquero, Chief Executive Officer
                                   Soren Bjorn, Vice President - Operations
                                   Jim Drewitz, Investor Relations
                                   817-491-2992

                                        
                       THE UNIMARK GROUP, INC. ANNOUNCES
                     SALE OF $14.99 MILLION OF COMMON STOCK
             TO AFFILIATE OF MEXICO STRATEGIC INVESTMENT FUND, LTD.


               - NET PROCEEDS ARE INTENDED TO REDUCE OUTSTANDING
                        DEBT AND FINANCE LEMON PROJECT -


Bartonville, TX July 20, 1998 - The UniMark Group, Inc. (NASDAQ NMS symbol:
"UNMG"), announces the Company has sold 3,305,500 newly issued shares of Common
Stock at a purchase price of $4.5375 per share, for an aggregate purchase price
of $14,998,706 to M&M Nominee L.L.C., an affiliate of the Mexico Strategic
Investment Fund, Ltd. In connection with the transaction, the Company granted
the Fund options to acquire additional 2,000,000 shares of Common Stock,
representation on the Company's Board of Directors and certain veto rights
regarding financial and corporate matters. The Company intends to use the net
proceeds to reduce its outstanding debt, finance its lemon project and for
working capital purposes. Mr. Rafael Vaquero, the Company's Chief Executive
Officer said, "We look forward to the Company experiencing long-term benefits
resulting from its improved capital structure, internal reorganization and
restructuring initiatives, as well as, its new affiliation with the Mexico
Strategic Investment Fund, Ltd."

The Fund is indirectly owned by a large number of institutional investors and
high net worth individual who invest through Quantum Industrial Partners L.D.C.
and Quasar Strategic Partners, L.D.C (members of the Quantum Group of Funds),
and through other institutional accounts. The funds in the Quantum Group of
Funds are advised by Soros Fund Management L.L.C., an affiliate of Mexico
Strategic Advisors, L.L.C., the adviser to the Fund. The Fund's investment
program emphasizes long-term investments in Latin American companies.

The UniMark Group, Inc. is a vertically integrated citrus and tropical fruit
growing, processing, marketing and distribution company with operations in
Mexico, the United States and Canada.


- ----------------
Certain of the above information is forward-looking and as such, only reflects
the Company's best assessment at this time. Investors are cautioned that
forward-looking statements involve risks and uncertainty, that actual results
may differ materially from such statements, and that investors should not place
undue reliance on such statements. For a discussion of factors that may affect
actual results, investors should refer to the Company's filing with the
Securities and Exchange Commission.



                                     -END-


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