PIMCO ADVISORS L P /
8-K, 1997-02-18
INVESTMENT ADVICE
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                              ____________________

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934

                              ____________________

Date of Report (Date of Earliest Event Reported):  FEBRUARY 13, 1997



PIMCO ADVISORS L.P.
(Exact Name of Registrant as Specified in Charter)


DELAWARE                              1-09772                   06-1349805
(State or Other Jurisdiction        (Commission                (IRS Employer
of Incorporation)                   File Number)             Identification No.)


800 NEWPORT CENTER DRIVE, NEWPORT BEACH, CA           92660
(Address of Principal Executive Offices)           (Zip Code)


Registrant's Telephone Number, including Area Code:  (714) 717-7022


NOT APPLICABLE
(Former Name or Former Address, if Changed Since Last Report)
<PAGE>
 
ITEM 5.   OTHER EVENTS

     On February 13, 1997, the Registrant entered into an Agreement and Plan of 
Merger by and among Oppenheimer Group, Inc., Oppenheimer Financial Corp., the 
Registrant and Thomson Advisory Group Inc. The agreement is attached as Exhibit 
2.1 hereto. On February 14, 1997, the Registrant issued the press release 
regarding such agreement attached as Exhibit 99.2 hereto.

ITEM 7.   FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

          (c)  EXHIBITS
               --------

<TABLE> 
<CAPTION> 
Exhibit No.    Description of Exhibit
- -----------    ----------------------
<C>            <S> 
2.1            Agreement and Plan of Merger dated as of February 13, 1997 by and
               among Oppenheimer Group, Inc., Oppenheimer Financial Corp., PIMCO
               Advisors L.P. and Thomson Advisory Group Inc.

99.1           Agreement to Furnish Exhibits and Schedules

99.2           Press Release dated February 14, 1997 issued by Registrant
</TABLE> 

                                       2
<PAGE>
 
                                   SIGNATURES

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


Dated:  February 18, 1997              PIMCO ADVISORS L.P.         

    
                                       By:  /s/ ROBERT FITZGERALD 
                                            --------------------------
                                                Robert Fitzgerald 
                                                Chief Financial Officer

                                       3
<PAGE>
 
                                 EXHIBIT INDEX


<TABLE> 
<CAPTION> 
Exhibit No.    Description of Exhibit
- -----------    ----------------------
<C>            <S> 
2.1            Agreement and Plan of Merger dated as of February 13, 1997 by and
               among Oppenheimer Group, Inc., Oppenheimer Financial Corp., PIMCO
               Advisers L.P. and Thomson Advisory Group Inc.

99.1           Agreement to Furnish Exhibits and Schedules

99.2           Press Release dated February 14, 1997 issued by Registrant
</TABLE> 

<PAGE>
 
                                                                     EXHIBIT 2.1


                          AGREEMENT AND PLAN OF MERGER



                         Dated as of February 13, 1997


                                  By and Among


                            OPPENHEIMER GROUP, INC.
                          OPPENHEIMER FINANCIAL CORP.

                                      and

                              PIMCO ADVISORS L.P.
                          THOMSON ADVISORY GROUP INC.
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                                Page
                                                                                ----
<S>                                                                             <C>
RECITALS........................................................................   1

ARTICLE I.  DEFINITIONS.........................................................   1
            -----------
     Section 1.1. Definitions...................................................   1
                  -----------

ARTICLE II.  THE MERGER.........................................................  10
             ----------
     Section 2.1.  The Merger...................................................  10
                   ----------
     Section 2.2. Merger Consideration..........................................  10
                  --------------------
     Section 2.3. Exchange of Certificates......................................  11
                  ------------------------
     Section 2.4. Final Distribution............................................  11
                  ------------------

ARTICLE III.  CLOSING...........................................................  13
              -------
     Section 3.1. Closing.......................................................  13
                  -------
     Section 3.2. Closing Deliveries............................................  13
                  ------------------

ARTICLE IV.  REPRESENTATIONS AND WARRANTIES OF OPFIN............................  14
             ---------------------------------------
     Section 4.1. Organization and Related Matters..............................  14
                  --------------------------------
     Section 4.2. Authority; No Violation.......................................  14
                  -----------------------
     Section 4.3. Consents and Approvals........................................  15
                  ----------------------
     Section 4.4.  Regulatory Documents.........................................  15
                   --------------------
     Section 4.5. Capitalization................................................  16
                  --------------
     Section 4.6. Financial Statements; Assets and Liabilities of Opgroup and
                  -----------------------------------------------------------
          Advantage Advisers....................................................  16
          ------------------
     Section 4.7. Ineligible Persons............................................  17
                  ------------------
     Section 4.8. Material Contracts............................................  18
                  ------------------
     Section 4.9. Legal Proceedings.............................................  18
                  ------------------
     Section 4.10. Permits and Applicable Law...................................  18
                   ---------------------------
     Section 4.11. Insurance....................................................  19
                   ----------
     Section 4.12. Labor and Employment Matters.................................  19
                   -----------------------------
     Section 4.13. Employee Benefit Plans; ERISA................................  19
                   -----------------------------
     Section 4.14. Intellectual Property........................................  20
                   ----------------------
     Section 4.15. Taxes........................................................  20
                   ------
     Section 4.16. Investment Companies, Managed Account Clients, Distributors,
                   ------------------------------------------------------------
          Etc...................................................................  22
          ----
     Section 4.17. Bringdown....................................................  23
                   ----------
     Section 4.18. Investment Company Status....................................  23
                   --------------------------
     Section 4.19. Brokers......................................................  24
                   --------
     Section 4.20. Additional Fund Representations..............................  24
                   --------------------------------
</TABLE>
<PAGE>
 
<TABLE>

<S>                                                                               <C>
ARTICLE V.  REPRESENTATIONS AND WARRANTIES OF TAG................................  24
            -------------------------------------
     Section 5.1. Organization and Related Matters...............................  24
                  --------------------------------
     Section 5.2. Authority; No Violation........................................  24
                  -----------------------
     Section 5.3. Consents and Approvals.........................................  25
                  ----------------------
     Section 5.4. Regulatory Documents...........................................  25
                  --------------------
     Section 5.5. Capitalization.................................................  26
                  --------------
     Section 5.6. Financial Statements...........................................  26
                  --------------------
     Section 5.7. Material Contracts.............................................  27
                  ------------------
     Section 5.8. Brokers........................................................  27
                  -------
     Section 5.9. Legal Proceedings..............................................  27
                  -----------------
     Section 5.10. Permits and Applicable Law....................................  28
                   --------------------------
     Section 5.11. Insurance.....................................................  28
                   ---------
     Section 5.12. Intellectual Property.........................................  28
                   ---------------------
     Section 5.13. Taxes.........................................................  28
                   -----
     Section 5.14. Section 15 of the Investment Company Act......................  30
                   ----------------------------------------
     Section 5.15. No Material Adverse Effect....................................  30
                   --------------------------
     Section 5.16. Bringdown.....................................................  30
                   ---------

ARTICLE VI.   REPRESENTATIONS AND WARRANTIES OF PIMCO ADVISORS...................  30
              ------------------------------------------------
     Section 6.1. Organization...................................................  30
                  ------------
     Section 6.2. Authority; No Violation........................................  30
                  -----------------------
     Section 6.3. Consents and Approvals.........................................  31
                  ----------------------
     Section 6.4. Regulatory Documents...........................................  31
                  --------------------
     Section 6.5. Capitalization.................................................  32
                  --------------
     Section 6.6. Financial Statements...........................................  32
                  --------------------
     Section 6.7. Ineligible Persons.............................................  33
                  ------------------
     Section 6.8. Material Contracts.............................................  33
                  ------------------
     Section 6.9. No Broker......................................................  33
                  ---------
     Section 6.10. Legal Proceedings.............................................  33
                   -----------------
     Section 6.11. Permits and Applicable Law....................................  34
                   --------------------------
     Section 6.12. Insurance.....................................................  34
                   ---------
     Section 6.13. Labor and Employment Matters..................................  34
                   ----------------------------
     Section 6.14. Employment Benefit Plans; ERISA...............................  35
                   -------------------------------
     Section 6.15. Intellectual Property.........................................  35
                   ---------------------
     Section 6.16. Taxes.........................................................  36
                   -----
     Section 6.17. Investment Companies, Managed Account Clients, Distributors,
                   -----------------------------------------------------------
          Etc....................................................................  36
          ----
     Section 6.18. Section 15 of the Investment Company Act......................  37
                   ----------------------------------------
     Section 6.19. No Material Adverse Effect....................................  37
                   --------------------------

ARTICLE VII.  COVENANTS..........................................................  38
              ---------
     Section 7.1. Conduct of Business............................................  38
                  -------------------
     Section 7.2. Section 15 of the Investment Company Act; Opfin Covenants......  39
                  ---------------------------------------------------------
     Section 7.3. Non-Investment Company Advisory Agreement Consents.............  40
                  --------------------------------------------------
     Section 7.4. Insurance......................................................  41
                  ---------
</TABLE> 
<PAGE>
 
<TABLE> 
<S>                                                                                <C>
     Section 7.5. Section 15 of the Investment Company Act; TAG and PIMCO
                  -------------------------------------------------------
          Advisors Covenants......................................................  41
          ------------------
     Section 7.6. Further Assurances..............................................  42
                  ------------------
     Section 7.7. Efforts of Parties to Close.....................................  42
                  ---------------------------
     Section 7.8. Announcements...................................................  42
                  -------------
     Section 7.9. Access, Certain Communications..................................  43
                  ------------------------------
     Section 7.10. Regulatory Matters; Third Party Consents.......................  43
                   ----------------------------------------
     Section 7.11. Notification of Certain Matters................................  44
                   -------------------------------
     Section 7.12. Expenses.......................................................  45
                   --------
     Section 7.13. Transition Agreement...........................................  45
                   --------------------
     Section 7.14. Spin-Off.......................................................  45
                   --------
     Section 7.15. Opfin Actions..................................................  45
                   -------------
     Section 7.16. Closing Date Balance Sheets....................................  46
                   ---------------------------
     Section 7.17. Brokers........................................................  46
                   -------
     Section 7.18. Advantage Advisers and Opgroup at Closing......................  46
                   -----------------------------------------
     Section 7.19. Spin-Off.......................................................  47
                   --------
     Section 7.20 Certain Pre-Closing Matters.....................................  47
                  ---------------------------

ARTICLE VIII.  CONDITIONS TO CLOSING..............................................  47
               ---------------------
     Section 8.1. Conditions to TAG's Obligations.................................  47
                  -------------------------------
     Section 8.2. Conditions to Opfin's and Opgroup's Obligations.................  50
                  -----------------------------------------------
     Section 8.3. Mutual Conditions...............................................  51
                  -----------------

ARTICLE IX.  ACTIONS SUBSEQUENT TO THE MERGER.....................................  52
     Section 9.1. Formation of New PIMCO Advisors Investment Management
                  -----------------------------------------------------
          Subsidiary..............................................................  52
          -----------
     Section 9.2. PIMCO Advisors Restructuring....................................  52
                  ----------------------------
     Section 9.3. Additional Fund Related Covenants...............................  53
                  ---------------------------------
     Section 9.4. Continuing Covenants............................................  53
                  --------------------
     Section 9.5. Supplemental IRS Rulings........................................  54
                  ------------------------

ARTICLE X.  INDEMNIFICATION.......................................................  55
            ---------------
     Section 10.1. Indemnification by PIMCO Advisors and TAG......................  55
                   -----------------------------------------
     Section 10.2. Indemnification by Opfin.......................................  55
                   ------------------------
     Section 10.3. Monetary Limitation............................................  56
                   -------------------
     Section 10.4. Nature and Survival; Time Limits...............................  56
                   --------------------------------
     Section 10.5. Limitation on Remedies.........................................  57
                   ----------------------
     Section 10.6. General Provisions.............................................  57
                   ------------------

ARTICLE XI.  TERMINATION/SURVIVAL.................................................  59
             --------------------
     Section 11.1. Termination....................................................  59
                   -----------
     Section 11.2. Survival After Termination.....................................  60
                   --------------------------

ARTICLE XII.  MISCELLANEOUS.......................................................  60
              -------------
     Section 12.1. Limitation on Liability........................................  60
                   -----------------------
     Section 12.2. No Right of Set Off............................................  61
                   -------------------
     Section 12.3. Amendments; Waiver.............................................  61
                   ------------------
</TABLE> 
<PAGE>
 
<TABLE> 
<S>                                                                                <C>
     Section 12.4. Entire Agreement...............................................  61
                   ----------------
     Section 12.5. Interpretation.................................................  61
                   --------------
     Section 12.6. Severability...................................................  62
                   ------------
     Section 12.7. Notices........................................................  62
                   -------
     Section 12.8. Binding Effect; No Third Party Beneficiaries; No Assignment....  63
                   -----------------------------------------------------------
     Section 12.9. Counterparts...................................................  63
                   ------------
     Section 12.10. Governing Law.................................................  63
                    -------------
     Section 12.11. WAIVER OF JURY TRIAL AND PUNITIVE DAMAGES.....................  64
</TABLE> 

ANNEX A:    Description of Spin-Off
ANNEX B:    Form of Opgroup Shareholder Certificate
ANNEX C:    Form of License Agreement
ANNEX D:    Form of Amended and Restated Certificate of Incorporation
ANNEX E:    Form of Contribution Agreement
ANNEX F:    Form of Registration Rights Agreement
ANNEX G:    Form of Keepwell Agreement
ANNEX H:    Description of Restructuring
ANNEX I:    Form of Transition Agreement
ANNEX J:    Tax Indemnity Agreement
ANNEX K:    Form of Assumption and Assignment Agreement
ANNEX L:    Form of Proxy
ANNEX M:    Form of PIMCO Purchase Agreement
ANNEX N:    Matters to be included in IRS Ruling
ANNEX O:    Covenant Regarding New TAG Trust
ANNEX P:    Covenant Regarding Opfin Trust
<PAGE>
 
                         AGREEMENT AND PLAN OF MERGER

          AGREEMENT AND PLAN OF MERGER, dated as of  February 13, 1997, by and
among Oppenheimer Group, Inc., a Delaware corporation ("Opgroup"), Oppenheimer
Financial Corp., a Delaware corporation ("Opfin"), PIMCO Advisors L.P., a
Delaware limited partnership ("PIMCO Advisors"), and Thomson Advisory Group
Inc., a Delaware corporation ("TAG").

                                    RECITALS

          WHEREAS, Opfin and Opgroup propose to engage in a series of
transactions which will result in (i) Opgroup owning all of the stock of
Advantage Advisers, Inc., a Delaware corporation ("Advantage Advisers"), and
none of the stock of Opfin and being indebted to Oppenheimer Capital, L.P., a
Delaware limited partnership ("Opcap LP"), and (ii) Advantage Advisers owning
the Advantage Advisers Business (as defined below) and  a 1% general partner
interest in Opcap LP and a general partner interest in Oppenheimer Capital, a
Delaware general partnership ("Opcap") (collectively, the "Interests"); and

          WHEREAS, PIMCO Advisors, TAG, Opfin and Opgroup desire that, following
the consummation of such transactions, Opgroup merge with and into TAG, on the
terms and conditions set forth in this Agreement.

          NOW THEREFORE, in consideration of the mutual covenants,
representations, warranties and agreements contained herein, and of other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, and intending to be bound hereby, the parties hereby agree as
follows:

                                   ARTICLE 1.


                                  DEFINITIONS
                                  -----------

          Section 1.1.  Definitions.
                        -----------

          For all purposes of this Agreement, the following terms shall have the
respective meanings set forth in this Section 1.1 (such definitions to be
equally applicable to both the singular and plural forms of the terms herein
defined):

          "Acceptable IRS Ruling" shall mean an IRS Ruling pertaining to the
Spin-Off, the form and substance of which are approved by Opgroup and PIMCO
Advisors, which approvals shall not unreasonably be withheld.

          "Advantage Advisers" has the meaning set forth in the Recitals to this
Agreement.

          "Advantage Advisers Business" shall mean the business of  sponsoring,
managing and advising for compensation the Advantage Advisers Funds.

          "Advantage Advisers Funds" shall mean the funds set forth on Schedule
1.1(a).

          "Advisers Act" shall mean the Investment Advisers Act of 1940, as
amended, and the rules and regulations of the SEC thereunder.

                                       1
<PAGE>
 
          "Advisory Agreement" shall mean any agreement with respect to the
provision of investment advisory services as provided in the Advisers Act.

          "Affiliate" shall mean any individual, partnership, corporation,
entity or other Person that, directly or indirectly, through one or more
intermediaries, controls or is controlled by, or is under common control with,
the Person specified.

          "Agreement" shall mean this Agreement, as it may hereafter be amended.

          "Applicable Law" with respect to a Person, shall mean any domestic or
foreign federal, state or local statute, law, ordinance, rule, administrative
interpretation, regulation, order, writ, injunction, directive, judgment,
decree, policy, guideline or other requirement applicable to such Person or any
of its Affiliates, or to its or their properties or assets.

          "Assumption and Assignment Agreement" shall mean that certain
Assumption and Assignment Agreement between Opfin and Advantage Advisers, in the
form attached hereto as Annex K.

          "Business Day" shall mean any day other than a Saturday, a Sunday or a
day on which banks in the State of New York are permitted or required to be
closed for regular banking business.

          "Capitalized Lease Obligations" means, at any time any determination
thereof is to be made, the amount of the liability in respect of a lease of any
property (whether real, personal or mixed) which should be capitalized on the
balance sheet of the lessee in accordance with GAAP.

          "Capital Stock" means any and all shares, interests, participations,
rights or other equivalents (however designated) of corporate stock and any
warrants or options to acquire such capital stock.

          "Class A Units" shall mean the Class A units of limited partner
interest of PIMCO Advisors.

          "Class B Units" shall mean the Class B units of limited partner
interest of PIMCO Advisors.

          "Closing" shall mean the completion of the transactions contemplated
by Articles II and III of this Agreement.

          "Closing Date" shall mean the date of the Closing.

          "Closing Date Balance Sheets" has the meaning set forth in Section
7.16.

          "Closing Valuation Date" shall mean the date four calendar days prior
to the Closing Date unless such date is not a Business Day, in which event such
date shall be the Business Day next preceding the fourth preceding calendar day.

          "Code" shall mean the Internal Revenue Code of 1986, as amended, or
any successor statute.

          "DGCL" has the meaning set forth in Section 2.1.

                                       2
<PAGE>
 
          "Effective Time" shall mean the time at which the certificate of
merger of the Merger is duly filed with the Secretary of State of the State of
Delaware (or such other time as may be specified in such certificate of merger).

          "Encumbrance" shall mean any lien, pledge, security interest, claim,
charge, easement, limitation, commitment, encroachment, restriction or
encumbrance of any kind or nature whatsoever.

          "ERISA" shall mean the Employee Retirement Income Security Act of
1974, as amended, and the regulations and class exemptions of the Department of
Labor thereunder.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations of the SEC thereunder.

          "GAAP" shall mean generally accepted accounting principles as used in
the United States of America, as in effect at the time any applicable financial
statements were prepared.

          "Governmental Authority" shall mean any government (domestic or
foreign), any state or other political subdivision thereof, any entity
exercising executive, legislative, judicial, regulatory or administrative
functions of or pertaining to government, including, without limitation, the
SEC, the Commodity Futures Trading Commission or any other government authority,
agency, department, board, commission or instrumentality of the United States,
any State of the United States or any political subdivision thereof, and any
court, tribunal or arbitrator(s) of competent jurisdiction, and any governmental
or non-governmental self-regulatory organization, agency or authority (including
the New York Stock Exchange and the National Association of Securities Dealers,
Inc.).

          "GP Unit" has the meaning set forth in Section 6.5.

          "HSR Act" shall mean the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended, and the rules and regulations promulgated thereunder.

          "Identified Funds" shall mean, collectively: (i) the Advantage
Advisers Funds, (ii) OCC Cash Reserves, Inc. and (iii) OCC Accumulation Trust.

          "Indemnified Claim" has the meaning set forth in Section 10.6(a).

          "Indemnified Party" has the meaning set forth in Section 10.6(a).

          "Indemnifying Party" has the meaning set forth in Section 10.6(a).

          "Interested Director" has the meaning set forth in Section 8.1(n).

          "Interests" has the meaning set forth in the Recitals to this
Agreement.

          "Investment Company" shall have the meaning provided in the Investment
Company Act.

          "Investment Company Act" shall mean the Investment Company Act of
1940, as amended, and the rules and regulations of the SEC thereunder.

                                       3
<PAGE>
 
          "IRS" shall mean the Internal Revenue Service.

          "IRS Ruling" has the meaning set forth in Section 7.10(c).

          "IRS Ruling Request" has the meaning set forth in Section 7.10(c).

          "IRS Submission" has the meaning set forth in Section 7.10(c).

          "Keepwell Agreement" has the meaning set forth in Section 8.2(j).

          "License Agreement" has the meaning section for in Section 8.1(i).

          "Losses" has the meaning set forth in Section 10.6(g).

          "Merger" has the meaning set forth in Section 2.1.

          "New TAG Preferred" has the meaning set forth in Section 2.2.

          "New TAG Preferred Underlying Units" has the meaning set forth in
Section 8.2(h).

          "Offshore Investment Company" shall mean an Investment Company
organized under the laws of a jurisdiction other than the United States.

          "OFI" shall mean Oppenheimer Funds, Inc. (formerly Oppenheimer
Management Corporation).

          "OFI Contingent Payments" shall mean the "Initial Payment" and the
"Exchange Payment" from OFI to Opcap under the terms of the OFI/Opcap Letter
Agreement.

          "OFI/Opcap Letter Agreement" shall mean that certain letter agreement,
dated August 17, 1995, and as amended to date by and among Opcap, Quest for
Value Advisors and Quest for Value Distributors, as sellers, and OFI, as buyer.

          "Opcap" has the meaning set forth in the Recitals to this Agreement.

          "Opcap Balance Sheets" has the meaning set forth in Section 4.6(a).

          "Opcap Interest" shall mean the Interest which is the managing general
partner interest in Opcap.

          "Opcap LP" has the meaning set forth in the Recitals to this
Agreement.

          "Opcap LP Interest" shall mean the Interest which is the general
partner interest in Opcap LP.

          "Opco LP" shall mean Oppenheimer & Co., L.P., a Delaware limited
partnership.

          "Opfin" has the meaning set forth in the first paragraph of this
Agreement.

          "Opfin Consolidated Net Worth," means, as at any date of
determination, the Capital Stock and additional paid-in capital, and retained
earnings (or minus accumulated deficit) of Opfin and its Subsidiaries on a
consolidated basis, all as determined in accordance with GAAP.

                                       4
<PAGE>
 
          "Opfin Indebtedness" means, with respect to Opfin on a stand-alone
basis, all (i) indebtedness for borrowed money, (ii) Capitalized Lease
Obligations, (iii) notes payable and drafts accepted representing extensions of
credit whether or not representing obligations for borrowed money (other than
any balance that constitutes an accrued expense or trade payable), (iv)
obligations owed for all or any part of the deferred purchase price of property
or services which have been rendered which purchase price is (y) due more than
one year from the date of incurrence of the obligation in respect thereof, or
(z) evidenced by a note or similar written instrument, in each case except any
such obligation that constitutes an accrued expense or trade payable, (v)
indebtedness secured by any Encumbrance on any property or asset owned or held
by Opfin regardless of whether the indebtedness secured thereby shall have been
assumed by Opfin or is non-recourse to the credit of Opfin, (vi) reimbursement
obligations and other liabilities of Opfin with respect to letters of credit
issued for Opfin's account, in each case if and to the extent any of the
foregoing items (i)-(v) would appear as a liability upon balance sheet of Opfin
prepared on a stand-alone basis in accordance with GAAP, and (vii) items of the
type described in any of clauses (i)-(vi) above guaranteed by Opfin.

          "Opfin's Opcap Share" has the meaning set forth in Section 2.4(c).

          "Opfin's Opcap LP Share" has the meaning set forth in Section 2.4(c).

          "Opfin Trust" has the meaning set forth in Section 8.1(v).

          "Opgroup," as used in this Agreement, shall mean solely Oppenheimer
Group, Inc. on a stand-alone basis, exclusive of (x) its subsidiaries or
affiliates and (y) the brokerage business conducted by Oppenheimer & Co., Inc.

          "Opgroup Benefit Plan" has the meaning set forth in Section 4.13.

          "Opgroup Business" shall mean (i) the Advantage Advisers Business,
(ii) the business of acting as sole general partner of Opcap LP and managing
general partner of Opcap after the Closing and  (iii) the Oppenheimer Capital
Business.

          "Opgroup Class A Common Stock" has the meaning set forth in Section
2.2.

          "Opgroup Class B Common Stock" has the meaning set forth in Section
2.2.

          "Opgroup Common Stock" has the meaning set forth in Section 4.5.

          "Opgroup Distribution Contract" has the meaning set forth in Section
4.16(e).

          "Opgroup Equities Note" shall mean the 10% note due 2012, in the
principal amount of $32,193,000, issued by Oppenheimer Equities Inc., a Delaware
corporation, to Opcap LP.

          "Opgroup Indemnitees" has the meaning set forth in Section 10.1.

          "Opgroup Intellectual Property" has the meaning set forth in Section
4.14.

          "Opgroup Investment Company Client" shall mean any Opgroup Public
Investment Company Client, Opgroup Private Investment Company Client or Opgroup
Offshore Investment Company Client.

                                       5
<PAGE>
 
          "Opgroup's Knowledge" or "to the Knowledge of Opgroup" shall mean only
the knowledge after due inquiry of Roger W. Einiger, Nathan Gantcher, Stephen
Robert, Joseph M. La Motta, George Long, Kenneth Mortensen, Sheldon Siegel and
Thomas Duggan.

          "Opgroup Managed Account Client" shall mean any Person, other than an
Investment Company, for or in respect of which any Opgroup Subsidiary provides
investment advisory or similar services (including, without limitation,
investment sub-advisory services).

          "Opgroup Material Adverse Effect" shall mean any matter or matters
affecting Opgroup or any Opgroup Subsidiary that has or reasonably could be
expected to have a material adverse effect on the business, assets, financial
condition or results of operations of Opgroup (after taking into account the
Spin-Off) and the Opgroup Subsidiaries, taken as a whole, or on the ability of
Opgroup to complete the Closing or the Spin-Off; provided, however, that a claim
or action by OFI arising under that certain Agreement Not to Compete dated as of
November 22, 1995 or that certain License Agreement dated November 25, 1995
shall not be considered an Opgroup Material Adverse Effect; and provided
further, that a decline in Opcap Run-Rate Revenues for any reason between the
date hereof and the Closing Valuation Date of less than or equal to 20% shall
not be considered in determining whether there has been an Opgroup Material
Adverse Effect (it being agreed that this exclusion shall not be considered in
any determination of whether any event or events other than a decline in Opcap
Run-Rate Revenues (or a related market downturn) constitutes an Opgroup Material
Adverse Effect).   For purposes of calculating any decline in Opcap Run-Rate
Revenues, the first $3.0 million of any such decline attributable to the
termination and sale of the Dual Purpose Fund shall be disregarded.

          "Opgroup Material Contract" has the meaning set forth in Section 4.8.

          "Opgroup Offshore Investment Company Client" shall mean each Offshore
Investment Company for or in respect of which any Opgroup Subsidiary provides
investment advisory or similar services (including, without limitation, sub-
investment advisory services).

          "Opgroup Private Investment Company Client" shall mean each Private
Investment Company for or in respect of which any Opgroup Subsidiary provides
investment advisory or similar services (including, without limitation, sub-
investment advisory services).

          "Opgroup Public Investment Company Client" shall mean each Public
Investment Company for or in respect of which any Opgroup Subsidiary provides
investment advisory or similar services (including, without limitation, sub-
investment advisory services); provided, that for purposes of Sections 7.2(a)
and 7.3, the Persons listed on Schedule 1.1(b) shall be deemed not to be Opgroup
Public Investment Company Clients; and provided, further, that, for all purposes
                                       --------  -------  ----
of this Agreement, none of the persons listed on Schedule 1.1(c) shall be deemed
to be an Opgroup Public Investment Company Client.

          "Opgroup Shareholders" shall mean the holders of Opgroup Class A
Common Stock and Opgroup Class B Common Stock immediately prior to the Merger.

          "Opgroup Subsidiary" shall mean each of Advantage Advisers, Opcap LP,
Opcap, Opcap Advisors, OCC Distributors, Oppenheimer Capital Limited,
Oppenheimer Capital Trust Company and AMA Investment Advisers, L.P.

                                       6
<PAGE>
 
          "Oppenheimer Capital Business" shall mean the business of providing
investment advice for compensation and related services, as conducted on the
date of this Agreement by Opcap and its subsidiaries.

          "PAI" has the meaning set forth in Annex H.

          "PAI Preferred Stock" has the meaning set forth in Annex H.

          "Permits" shall mean licenses, franchises, permits, registrations and
authorizations of any Governmental Authority.

          "Person" shall mean any individual, corporation, partnership (limited
or general), limited liability company, joint venture, association, trust or
other entity.

          "PIMCO Advisors" has the meaning set forth in the first paragraph of
this Agreement.

          "PIMCO Advisors Balance Sheets" has the meaning set forth in Section
6.6.

          "PIMCO Advisors Benefit Plan" has the meaning set forth in Section
6.14(a).

          "PIMCO Advisors Distribution Contract" has the meaning set forth in
Section 6.17(e).

          "PIMCO Advisors Investment Company Client" shall mean any PIMCO
Advisors Public Investment Company Client, PIMCO Advisors  Private Investment
Company Client or PIMCO Advisors  Offshore Investment Company Client.

          "PIMCO Advisors' Knowledge" or "to the Knowledge of PIMCO Advisors"
shall mean only the knowledge after due inquiry of William Cvengros, William
Thompson, Robert Fitzgerald, Kenneth Poovey and Richard Weil.

          "PIMCO Advisors Managed Account Client" shall mean any Person, other
than an Investment Company, for or in respect of which PIMCO Advisors and any
PIMCO Advisors Subsidiary provides investment advisory or similar services
(including, without limitation, sub-investment advisory services).

          "PIMCO Advisors Material Contract" has the meaning set forth in
Section 6.8.

          "PIMCO Advisors Material Client" has the meaning set forth in Section
6.17.

          "PIMCO Advisors Offshore Investment Company Client" shall mean each
Offshore Investment Company for or in respect of which PIMCO Advisors or any
PIMCO Advisors Subsidiary provides investment advisory or similar services
(including, without limitation, sub-investment advisory services).

          "PIMCO Advisors Private Investment Company Client" shall mean each
Private Investment Company for, or in respect of which, PIMCO Advisors or any
PIMCO Advisors Subsidiary provides investment advisory or similar services
(including, without limitation, sub-investment advisory services).

                                       7
<PAGE>
 
          "PIMCO Advisors Public Investment Company Client" shall mean each
Public Investment Company for or in respect of which PIMCO Advisors or any PIMCO
Advisors Subsidiary provides investment advisory or similar services (including,
without limitation, sub-investment advisory services).

          "PIMCO Advisors Purchase Agreement"  shall mean that certain agreement
of PIMCO Advisors regarding the purchase of the shares of New TAG Preferred
under certain circumstances in the form of Annex M.

          "PIMCO Advisors Subsidiary" shall mean each of Pacific Investment
Management Company, Parametric Portfolio Associates, Cadence Capital Management,
NFJ Investment Group, Blairlogie Capital Management, Columbus Circle Investors
and PIMCO Funds Distribution Company.

          "PIMCO Indemnitees" has the meaning set forth in Section 10.2.

          "PIMCO Partners" shall mean PIMCO Partners, G.P., a California general
partnership.

          "Pre-Closing Taxable Period" shall mean any Taxable Year that ends on
or before the Closing Date.

          "Present Value Benefit" shall mean the present value (based on a
discount rate equal to the short-term applicable federal rate as determined
under Section 1274(d) of the Code at the time of determination, and assuming
that the Indemnified Party will be liable for Taxes at all relevant times at the
maximum marginal rates) of any income tax benefit; provided, however, that the
tax rates applicable to a partnership shall be deemed to be those applicable to
a Subchapter C corporation.

          "Private Investment Company" shall mean an Investment Company, other
than an Offshore Investment Company, that would be an investment company, as
defined in the Investment Company Act, but for the exception contained in
Section 3(c)(1) or Section 3(c)(7) of that Act.

          "Public Investment Company" shall mean an Investment Company, other
than a Private Investment Company or an Offshore Investment Company.

          "Registration Rights Agreement" has the meaning set forth in Section
8.2(i).

          "Regulatory Documents" shall mean all (i) Forms ADV (and amendments
thereto), (ii) Forms BD (and amendments thereto), (iii) forms filed under the
Exchange Act (other than Forms 3, 4, and 5 or Schedules 13D, 13F or 13G) and
(iv), with respect to an Opgroup Public Investment Company Client, Registration
Statements on Form N-1A under the Investment Company Act.

          "Relevant Entities" has the meaning set forth in Section 7.5.

          "Restructuring" has the meaning set forth in Section 9.2.

          "Run-Rate Revenues" with respect to a Person at a particular date
shall mean revenues calculated by multiplying such Person's assets under
management at such date by the applicable management fee rates (reflective of
any discounts and excluding any performance fees) then in effect for such
assets.

                                       8
<PAGE>
 
          "SBAM Funds" has the meaning set forth in Section 7.2(b).

          "SEC" shall mean the Securities and Exchange Commission.

          "Securities Act" shall mean the Securities Act of 1933, as amended,
and the rules and regulations of the SEC thereunder.

          "Securities Laws" shall mean the Securities Act; the Exchange Act; the
Investment Company Act; the Advisers Act; the Commodity Exchange Act and the
rules under such Acts; and state securities and commodities laws; and, with
respect to the issuance of interests of any Offshore Investment Company, the
securities laws of any jurisdiction in which interests of such company are
offered or sold.

          "Spin-Off" shall mean that series of transactions described in Annex A
hereto.

          "Straddle Quarter" has the meaning set forth in Section 2.4.

          "Subsidiary" has the meaning set forth in Regulation S-X promulgated
under the Securities Laws.

          "TAG" has the meaning set forth in the first paragraph hereof and
includes any direct or indirect successor.

          "TAG Contribution Agreement" has the meaning set forth in Section
8.2(h).

          "TAG's Knowledge" or "to the Knowledge of TAG" shall mean only the
knowledge after due inquiry of Donald Miller, Khanh Tran, William Cvengros,
William Thompson, Robert Fitzgerald, Kenneth Poovey and Richard Weil.

          "TAG Material Adverse Effect" shall mean any matter or matters
affecting TAG, PIMCO Advisors or any PIMCO Advisors Subsidiary that has or have
or could reasonably be expected to have a material adverse effect on the
business, assets, financial condition or results of operations of TAG, PIMCO
Advisors and PIMCO Advisors' investment management partnerships taken as a whole
or on the ability of TAG to complete the Closing.

          "TAG Material Contract" has the meaning set forth in Section 5.7.

          "Tax" or "Taxes" shall mean all taxes, charges, fees, imposts, levies
           ---      -----
or other assessments, including, without limitation, all net income, gross
receipts, capital, sales, use, gains, ad valorem, value added, transfer,
franchise, profits, inventory, goods and services, capital stock, license,
withholding, payroll, employment, social security, unemployment, disability,
excise, severance, stamp, documentary stamp, occupation, property, mortgage
recording and estimated taxes, together with any interest, penalties, or
additions thereto imposed by any governmental taxing authority (domestic or
foreign).

          "Tax Indemnity Agreement" shall mean the agreement dated as of the
Closing among Opfin, Opgroup, PIMCO Advisors and TAG covering the responsibility
for Taxes for periods (or the portion thereof) ending before the Closing and
Taxes that may result from the Spin-Off, substantially in the form of Annex J.

                                       9
<PAGE>
 
          "Tax Return" shall mean any return, report, information statement,
schedule or other document (including any related or supporting information)
with respect to Taxes required to be provided to any Governmental Authority, and
any amendments thereof.

          "Taxable Year" shall mean, with respect to any Tax of any taxpayer,
the period, for applicable federal, state, local or foreign Tax purposes, for
which such Tax is computed.

          "Transaction Document" shall mean any agreement delivered hereunder or
contemplated hereby, including but not limited to the License Agreement, the
Registration Rights Agreement, the Keepwell Agreement, the TAG Contribution
Agreement, the Transition Agreement, the PIMCO Advisors Purchase Agreement and
the Tax Indemnity Agreement.

          "Transition Agreement" has the meaning set forth in Section 7.13.

          "Trust" shall mean the trust established under that certain
Declaration of Trust, to be entered into after the date hereof, between the
Opgroup Shareholders and the persons named therein as trustees.

          "Trust Covenants" has the meaning set forth in Section 8.1(w).

          "Trustees" shall mean the Trustees under the Trust.

          "Value Advisors" has the meaning set forth in Section 9.1.

          "Warrant Agreement" shall mean that certain Warrant Agreement dated
March 18, 1986, as amended, by and among Opco LP, Opgroup and the other parties
thereto.

                                   ARTICLE II.

                                   THE MERGER
                                   ----------

          Section 2.1.  The Merger.
                        ----------

          Subject to the terms and conditions of this Agreement, at the
Effective Time, Opgroup shall be merged with and into TAG in accordance with
this Agreement and the separate corporate existence of Opgroup shall thereupon
cease (the "Merger").  TAG shall be the surviving corporation in the Merger
(sometimes hereinafter referred to as the "Surviving Corporation").  The Merger
shall have the effects specified in the Delaware General Corporation Law (the
"DGCL").

          Section 2.2.  Merger Consideration.
                        --------------------

               (a) At the Effective Time, each share of Class A Common Stock,
     $.01 par value, of Opgroup (the "Opgroup Class A Common Stock") and each
     share of Class B Common Stock, $.01 par value, of  Opgroup (the "Opgroup
     Class B Common Stock") issued and outstanding immediately prior to the
     Effective Time shall, by virtue of the Merger and without any action on the
     part of the holder thereof, be converted into 2.554825 shares (subject to
     adjustment as provided below) of  Series C Cumulative Convertible Preferred
     Stock, $.01 par value, of TAG ("New TAG Preferred").  As a result of the
     Merger and without any action on the part of the holder thereof, at the
     Effective Time all shares of Opgroup Class A Common Stock and Opgroup Class
     B Common Stock shall cease to be outstanding and shall be canceled and
     retired and shall cease to exist, and each holder of

                                       10
<PAGE>
 
     shares of Opgroup Class A Common Stock and Opgroup Class B Common Stock
     shall thereafter cease to have any rights with respect to such shares,
     except the right to receive, without interest, New TAG Preferred in
     accordance with this Section 2.2 upon the surrender of a certificate which
     represented shares of Opgroup Class A Common Stock or Opgroup Class B
     Common Stock immediately prior to the Effective Time.

               (b) If there is a decline in Opcap Run-Rate Revenues from the
     date hereof through the Closing Valuation Date of more than 10%, then the
     number of shares of New TAG Preferred into which each share of Opgroup
     Class A Common Stock and Opgroup Class B Common Stock shall convert
     pursuant to Section 2.2(a) shall be reduced by a percentage equal to 0.75
     multiplied by the (whole or fractional) number of percentage points of the
     decline in excess of  10%, up to a maximum reduction of 7.5%.  For example,
     if there were a decline in Opcap Run-Rate Revenues between such dates of
     15% (exclusive of the first $3.0 million of such decline attributable to
     the termination and sale of the Dual Purpose Fund), then the number of
     shares of New TAG Preferred into which a share of Opgroup Class A Common
     Stock and Opgroup Class B Common Stock would convert would be reduced by
     3.75% (that is, 0.75(15% - 10%)) to 2.459019 shares of New TAG Preferred.

          Section 2.3.  Exchange of Certificates.
                        ------------------------

               (a)  At the Effective Time, the Opgroup Shareholders shall
     surrender certificates for all shares of Opgroup Class A Common Stock and
     Opgroup Class B Common Stock in exchange for (i) the certificates for the
     shares of New TAG Preferred into which such shares were converted pursuant
     to Section 2.2 and the certificates so surrendered shall forthwith be
     canceled.

               (b) At or after the Effective Time, there shall be no transfers
     on the stock transfer books of Opgroup of the shares of Opgroup Class A or
     Opgroup Class B Common Stock which were outstanding immediately prior to
     the Effective Time.

               (c) No fractional shares of New TAG Preferred shall be issued
     pursuant hereto.  In lieu of the issuance of any fractional share of New
     TAG Preferred pursuant to Section 2.2, (i) any person who, but for this
     Section 2.3(c), would have been entitled to receive a fractional share of
     New TAG Preferred representing one-half or more of a share of New TAG
     Preferred, shall receive instead one whole share of New TAG Preferred, and
     (ii) any person who, but for this Section 2.3(c), would have been entitled
     to receive a fractional share of New TAG Preferred representing less than
     one-half of a share of New TAG Preferred, shall receive nearest the whole
     number of shares of New TAG Preferred calculated by  "rounding down" from
     the number of shares (inclusive of the fractional share) such person would
     have received.

          Section 2.4.  Final Distribution.
                        ------------------

               (a) In the event that the Closing Date occurs after the end of an
     Opcap fiscal quarter but before the distribution for such quarter has been
     paid by Opcap, PIMCO Advisors shall pay, or cause to be paid, to Opfin an
     amount equal to the distribution in respect of the Opcap Interest for such
     quarter on the third Business Day following the date on which the
     distribution for such quarter is received by Value Advisors, TAG or any TAG
     Affiliate (to the extent that any such amount is not distributed by Opcap
     to Opfin).

                                       11
<PAGE>
 
               (b) In the event that the Closing Date occurs after the end of an
     Opcap LP fiscal quarter but before the distribution for such quarter has
     been paid by Opcap LP, TAG shall pay, or cause to be paid, to Opfin an
     amount equal to the distribution in respect of the Opcap LP Interest for
     such quarter on the third Business Day following the date on which the
     distribution for such quarter is received by Advantage Advisers, TAG or any
     TAG Affiliate (to the extent that any such amount is not distributed by
     Opcap LP to Opfin).

               (c) On the third business day following the date on which a
     distribution for such fiscal quarter is received by Value Advisors, TAG or
     any TAG Affiliate, as applicable, such Person shall pay, or cause to be
     paid, to Opfin, with respect to any fiscal quarter of Opcap or Opcap LP
     that begins before and ends after the Closing Date (a "Straddle Quarter"):

                      (i)   An amount equal to the total distribution received
          by Value Advisors, TAG or any TAG Affiliate from Opcap in respect of
          the Opcap Interest for such Straddle Quarter multiplied by a fraction
          equal to (a) Opfin's Opcap Share divided by (b) the total amount of
          the net income of Opcap allocated to the Opcap Interest for the
          Straddle Quarter. "Opfin's Opcap Share" is equal to the sum of the net
          income of Opcap allocated to the Opcap Interest for each full month in
          the Straddle Quarter prior to the Closing Date plus a pro rata portion
          of the net income of Opcap allocated to the Opcap Interest for the
          month in which the Closing Date occurs based on the ratio of (x) the
          number of days in such month elapsed prior to the Closing Date to (y)
          the total number of days in such month.

                      (ii)  An amount equal to the total distribution received
          by Advantage Advisers, TAG or any TAG Affiliate from Opcap LP in
          respect of the Opcap LP Interest for such Straddle Quarter multiplied
          by a fraction equal to (a) Opfin's Opcap LP Share divided by (b) the
          total amount of the net income of Opcap LP allocated to the Opcap LP
          Interest for the Straddle Quarter. "Opfin's Opcap LP Share" is equal
          to the sum of the net income of Opcap LP allocated to the Opcap LP
          Interest for each full month in the Straddle Quarter prior to the
          Closing Date plus a pro rata portion of the net income of Opcap
          allocated to the Opcap LP Interest for the month in which the Closing
          Date occurs based on the ratio of (x) the number of days in such month
          elapsed prior to the Closing Date to (y) the total number of days in
          such month.

                      (iii) TAG shall cause Opcap and Opcap LP to allocate
          income for income tax purposes in accordance with distributions made
          pursuant to subsections (i) or (ii) of this Section 2.4(c).

          All calculations under this Section 2.4(c) shall be made without
     regard to any accrual or receipt during the Straddle Quarter of any OFI
     Contingent Payment.

               (d)  (i)  On the third Business Day following the date on which a
          distribution is made by Opcap to its Partners with respect to the
          fiscal quarter that includes the date on which Opcap has received
          payment from OFI of the OFI Contingent Payment, PIMCO Advisors shall
          pay or cause to be paid to Opfin an amount equal to the portion of the
          incremental net income attributable to the OFI Contingent Payment
          allocable to the Opcap Interest; provided, however, that, should the
          incremental net income from such OFI Contingent Payment not be
          allocable to

                                       12
<PAGE>
 
          Opfin for its Pre-Closing Taxable Period, the amount of such payment
          to Opfin, to the extent such payment is not deductible for income tax
          purposes by TAG, PIMCO Advisors or any their Affiliates, shall be net
          of an amount equal to the income or franchise taxes that would be
          payable on such incremental net income assuming a tax rate equal to
          the maximum marginal rate which would be applicable to a Subchapter C
          corporation; and provided further, however, that this Section
          2.4(d)(i) shall be inapplicable to the extent that the OFI Contingent
          Payment was included as part of the distribution under Sections 2.4(a)
          or 2.4(b).

               (ii) On the third Business Day following the date on which a
          distribution is made by Opcap LP to its Partners with respect fiscal
          quarter that includes the date on which Opcap has received payment
          from OFI the OFI Contingent Payment, TAG shall pay or cause to be paid
          to Opfin an amount equal to the portion of the incremental net income
          attributable to the OFI Contingent Payments allocable to the Opcap LP
          Interest; provided, however, that, should the net income from such OFI
          Contingent Payments not be allocable to Opfin for its Pre-Closing
          Taxable Period, the amount of such payment  to Opfin, to the extent
          such payment is not deductible for income tax purposes by TAG, PIMCO
          Advisors or any of their Affiliates, shall be net of  an amount equal
          to the income or franchise taxes that would be payable on such
          incremental net income assuming a tax rate equal to the maximum
          marginal rate which would be applicable to a Subchapter C corporation;
          and provided further, however, that this Section 2.4(d)(ii) shall be
          inapplicable to the extent that the OFI Contingent Payment was
          included as part of the distribution under Sections 2.4(a) or 2.4(b).


                                 ARTICLE III.

                                    CLOSING
                                    -------

          Section 3.1.  Closing.
                        -------

          Subject to the terms and conditions of this Agreement, the closing of
the transactions provided for in this Agreement (the "Closing") shall be at
10:00 A.M. New York City Time at the offices of Weil, Gotshal & Manges LLP, 767
Fifth Avenue, New York, New York 10153, or at such other location designated by
TAG and Opgroup within five business days after the date on which the conditions
set forth in Article VIII (other than those conditions designating instruments,
opinions, certificates or other documents to be delivered at the Closing) have
been satisfied or waived (the "Closing Date").

          Section 3.2.  Closing Deliveries.
                        ------------------

               (a)  At the Closing,  Opfin and the Trustees, as applicable,
     shall deliver to TAG the following:

               (i) stock certificates representing all the outstanding shares of
               Opgroup Class A Common Stock and Opgroup Class B Common Stock,
               accompanied by stock powers duly executed in blank; and

                                       13
<PAGE>
 
               (ii) the documents required to be delivered pursuant to Section
     8.1.

               (b)  At the Closing, TAG shall deliver the following:

               (i) to the Trustees, stock certificates registered as directed by
               the Trustees representing the aggregate number of shares of New
               TAG Preferred to be issued pursuant to Section 2.2; and

               (ii) to Opfin, the documents required to be delivered pursuant to
               Section 8.2.


                                  ARTICLE IV.

                    REPRESENTATIONS AND WARRANTIES OF OPFIN
                    ---------------------------------------

          Opfin represents and warrants to TAG and to PIMCO Advisors at the date
of this Agreement and at the Closing Date, as follows:

          Section 4.1.  Organization and Related Matters.
                        --------------------------------

          Each of Opgroup, Opfin and the Opgroup Subsidiaries that is a
corporation or a limited partnership is validly existing and in good standing
under the laws of the jurisdiction of its organization.  Each of the Opgroup
Subsidiaries that is a general partnership is validly existing under the laws of
the jurisdiction of its organization.  Each of Opgroup and the Opgroup
Subsidiaries has the corporate or partnership, as applicable, power and
authority to carry on its business as it is now being conducted and to own,
lease and operate all of its properties and assets, and is duly licensed or
qualified to do business in each jurisdiction in which the nature of the
business conducted by it or the character or location of the properties and
assets owned, leased or operated by it makes such qualification or licensing
necessary.  Copies of the certificate of incorporation, by-laws or partnership
agreement of Opgroup and the Opgroup Subsidiaries, as applicable, heretofore
delivered to TAG, are complete and correct copies of such instruments as
currently in effect.

          Section 4.2.  Authority; No Violation.
                        -----------------------

               (a) Opgroup and Opfin have full corporate power and authority to
     execute and deliver this Agreement and to consummate the transactions
     contemplated hereby.  Except as set forth on Schedule 4.2(a), the execution
     and delivery of this Agreement and the consummation of the transactions
     contemplated hereby have been duly and validly approved by all requisite
     corporate action, and no other corporate or partnership proceedings on the
     part of Opgroup, Opfin, any Opgroup Subsidiary or any of their shareholders
     or interest holders, as applicable, is necessary to approve this Agreement
     and to authorize and consummate the transactions contemplated hereby.  This
     Agreement has been duly and validly executed and delivered by Opgroup and
     Opfin, and (assuming the due authorization, execution and delivery of this
     Agreement by PIMCO Advisors and TAG) constitutes a valid and binding
     obligation of Opgroup and Opfin, enforceable against Opgroup and Opfin in
     accordance with its terms, except as enforcement may be limited by general
     principles of equity whether applied in a court of law or a court of equity
     and by bankruptcy, insolvency, moratorium and similar laws affecting
     creditors' rights and remedies generally.

                                       14
<PAGE>
 
               (b) Neither the execution and delivery of this Agreement by
     Opgroup or Opfin, nor the consummation by Opgroup and the Opgroup
     Subsidiaries of the transactions contemplated hereby or the Spin-Off, nor
     compliance by Opgroup or Opfin with any of the terms or provisions hereof,
     will (i) violate any provision of the articles of incorporation or bylaws
     or, as applicable, partnership agreement, of Opgroup, Opfin or any of the
     Opgroup Subsidiaries or (ii) except as set forth in Schedule 4.2(b), and
     assuming that the consents and approvals referred to in Sections 7.2 and
     7.3 are duly obtained, (x) violate any Applicable Law or (y) violate,
     conflict with, result in a breach of any provision of or the loss of any
     benefit under, constitute a default (or an event which, with notice or
     lapse of time, or both, would constitute a default) under, result in the
     termination of or a right of termination or cancellation under, accelerate
     the performance required by, or result in the creation of any material
     Encumbrance upon, any of Opgroup's, Opfin's or any Opgroup Subsidiary's
     properties or assets, or any note, bond, mortgage, indenture, deed of
     trust, license, lease, agreement or other instrument or obligation to which
     Opgroup, Opfin, or any Opgroup Subsidiary, is a party, or by which any of
     their respective properties or assets may be bound.

          Section 4.3.  Consents and Approvals.
                        ----------------------

          Except for (a) such consents, approvals and notices as are set forth
in Sections 7.2, 7.3 and 7.10(c) and Schedule 4.3, and (b) the applicable
filings under the HSR Act, no consents or approvals of or filings or
registrations with any Governmental Authority or third party are necessary in
connection with (i) the execution and delivery by Opgroup and Opfin of this
Agreement and (ii) the consummation by Opgroup, Opfin and the Opgroup
Subsidiaries of the transactions contemplated by this Agreement.

          Section 4.4   Regulatory Documents.
                        --------------------

               (a) Since April 30, 1993, Opfin, Opgroup, the Opgroup
     Subsidiaries and the Identified Funds (other than the SBAM Funds) and, to
     the Knowledge of Opgroup, the SBAM Funds, have filed all Regulatory
     Documents, together with any amendments required to be made with respect
     thereto, that were required to be filed by them with any Governmental
     Authority, including the SEC, with respect to the Opgroup Business.

               (b) As of their respective dates, the Regulatory Documents filed
     with respect to the Opgroup Business, including those with respect to the
     Identified Funds (other than the SBAM Funds) and, to Opgroup's Knowledge,
     the Regulatory Documents filed with respect to the SBAM Funds, complied in
     all material respects with the requirements of the Securities Laws, and the
     rules and regulations of the SEC promulgated thereunder applicable to such
     Regulatory Documents, and none of such Regulatory Documents, as of their
     respective dates, contained any untrue statement of a material fact or
     omitted 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. Where legally required to
     maintain such Regulatory Documents current, none of such Regulatory
     Documents 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 are
     made, not misleading.

                                       15
<PAGE>
 
          Section 4.5.  Capitalization.
                        --------------

               (a) On the Closing Date, the authorized capital stock of Opgroup
     will consist of (i) 1,000,000 shares of Class A Common Stock, 470,000
     shares of which will be issued and outstanding and are owned of record and
     beneficially by Opco LP, (ii) 1,000,000 shares of Class B Common Stock,
     442,000 shares of which will be issued and outstanding and owned of record
     and, to Opgroup's Knowledge, beneficially by Opco LP and the other
     stockholders listed on Schedule 4.5(a) in the respective amounts set forth
     opposite their names and (iii) 10,000 shares of preferred stock, par value
     $.01 per share, none of which will be issued and outstanding.  The shares
     of Opgroup Class A Common Stock and Opgroup Class B Common Stock are
     referred to herein, collectively, as the "Opgroup Common Stock."  All of
     the outstanding shares of Opgroup Common Stock (x) will be duly and validly
     authorized and issued, fully paid and nonassessable and (y) will not have
     been issued in violation of any preemptive right.  Except as set forth in
     Schedule 4.5, there are no outstanding options, warrants, calls, rights,
     commitments or agreements of any kind to which Opgroup or any Opgroup
     Subsidiary is party or by which any of them is bound obligating it to
     issue, deliver or sell, or cause to be issued, delivered or sold,
     additional shares of the capital stock of any class or series of, or other
     equity interests in, Opgroup or any Opgroup Subsidiary, or any securities
     convertible or exchangeable into or evidencing the right to purchase any
     shares of capital stock of any class or series of, or other equity
     interests in, Opgroup or any Opgroup Subsidiary, or obligating Opgroup or
     any Opgroup Subsidiary to grant, extend or enter into any such option,
     warrant, call, right, commitment or agreement. There are no outstanding
     contractual obligations of Opgroup or any Opgroup Subsidiary to repurchase,
     redeem or otherwise acquire any shares of capital stock of Opgroup or any
     Opgroup Subsidiary.  There are no outstanding bonds, debentures, notes or
     other securities or instruments of Opgroup (other than the Opgroup Common
     Stock) or any Opgroup Subsidiary having the right to vote (or convertible
     into, or exchangeable for, securities having the right to vote) on any
     matter on which stockholders of Opgroup may vote.

               (b) The authorized capital stock of Advantage Advisers consists
     of 100 shares of common stock, all of which are issued and outstanding and
     all of which, as of the Closing, will be legally and beneficially owned by
     Opgroup.  All of the outstanding shares of stock of Advantage Advisers are
     duly and validly authorized and issued, fully paid and nonassessable and
     have not been issued in violation of any preemptive right.

               (c) At the Closing Date, Opgroup will own the stock of  Advantage
     Advisers, and Advantage Advisers will own the Interests, in each case free
     and clear of any Encumbrances (other than statutory liens for Taxes not yet
     due and restrictions on transferability under the Securities Laws).  The
     Interests consist of (i) a 1% general partner interest in Opcap LP and (ii)
     a 32.52% general partner interest in Opcap, which percentage interest shall
     at the Closing Date be diminished only to the extent of vesting of
     restricted  rights or the exercise of vested options.  The Interests
     consist of all interests in Opcap LP or Opcap owned by Opfin, Opgroup or
     their Affiliates.

          Section 4.6. Financial Statements; Assets and Liabilities of Opgroup
                       -------------------------------------------------------
and Advantage Advisers.
- ----------------------

               (a) Opfin has previously delivered to TAG copies of (a) the
     audited consolidated balance sheets of Opcap LP and Opcap as of and for the
     fiscal years ended April 30, 1994, 1995 and 1996  (collectively, the "Opcap
     Balance Sheets") and the related

                                       16
<PAGE>
 
     audited statements of income, changes in stockholders' equity and cash
     flows, in each case accompanied by the audit report of Price Waterhouse
     LLP, independent public accountants with respect to each such entity, and
     (b) the unaudited consolidated interim balance sheets and related
     statements of income, changes in stockholders' equity and cash flows of
     both such entities at or for the periods ended July 31, 1996 and October
     31, 1996. Each of the balance sheets referred to in the previous sentence
     (including the related notes, where applicable) present fairly, in all
     material respects, the financial position of each of Opcap LP and Opcap as
     of the dates thereof, and the other financial statements referred to in the
     preceding sentence present fairly (subject, in the case of the unaudited
     statements, to recurring audit adjustments normal in nature and amount) the
     results of each of Opcap LP's and Opcap's operations and their respective
     cash flows for the respective periods therein set forth. Each of such
     financial statements (including the related notes, where applicable) has
     been prepared in accordance with GAAP consistently applied during the
     periods involved and are consistent with the books and records of the
     entity presented.

               (b) Opfin has previously delivered to TAG copies of the unaudited
     balance sheets of Advantage Advisers as of and for the fiscal years ended
     April 30, 1994, 1995 and 1996 and unaudited balance sheets as of and for
     the periods ended July 31, 1996 and October 31, 1996 (collectively, the
     "Advantage Advisers Balance Sheets") and the related unaudited statements
     of income.  Each of the Advantage Advisers Balance Sheets (including the
     related notes, where applicable) present fairly, in all material respects,
     the financial position of Advantage Advisers as of the dates thereof, and
     the other financial statements referred to in the preceding sentence
     present fairly (subject to recurring audit adjustments normal in nature and
     amount) the results of Advantage Advisers' operations for the respective
     periods therein set forth.  Each of such financial statements (including
     the related notes, where applicable) has been prepared in accordance with
     GAAP consistently applied during the periods involved and are consistent
     with the books and records of Advantage Advisers.

               (c) Attached hereto as Schedule  4.6(c) are the unaudited pro
     forma  balance sheets of each of Opgroup and Advantage Advisers on a stand-
     alone basis as of October 31, 1996, including related notes (which pro
     forma balance sheets assume that the transactions contemplated by the Spin-
     Off had occurred as of such date and eliminate all liabilities for which
     indemnification is available under Section 10.2(c)) (the "Pro Forma Balance
     Sheets").   Each of the Pro Forma Balance Sheets  (including the related
     notes) present fairly (subject to recurring audit adjustments normal in
     nature and amount) the pro forma financial position of each such entity as
     of the date thereof.  The Pro Forma Balance Sheets have been prepared in
     accordance with GAAP consistently applied during the periods involved and
     are consistent with the books and records of the entities presented.

          Section 4.7.  Ineligible Persons.
                        ------------------

          Neither Opgroup, nor any "affiliated person" (as defined in the
Investment Company Act) thereof is ineligible pursuant to Section 9(a) or 9(b)
of the Investment Company Act to serve as an investment adviser (or in any other
capacity contemplated by the Investment Company Act) to a registered investment
company.  Neither Opgroup nor any "associated person" (as defined in the
Advisers Act) thereof, is ineligible pursuant to Section 203 of the Advisers Act
to serve as an investment adviser or as an associated person to a registered
investment adviser.  Neither Opgroup nor any "associated person" (as defined in
the Exchange Act) thereof, is ineligible pursuant to

                                       17
<PAGE>
 
Section 15(b) of the Exchange Act to serve as a broker-dealer or as an
associated person to a registered broker-dealer.

          Section 4.8.  Material Contracts.
                        ------------------

          TAG has been provided true and correct copies of each of the following
agreements as currently in effect, including all amendments and modifications
thereto, to which Opgroup or any Opgroup Subsidiary will be a party at the
Closing Date or by which any of them will be, or their assets will be, bound at
the Closing Date and after giving effect to the Spin-off:  (a) any lease
(whether of real or personal property) providing for annual rentals of $250,000
or more; (b) any agreement for the purchase of materials, supplies, goods,
services, equipment or other assets providing for annual payments of $250,000 or
more; (c) any sales, distribution or similar agreement providing for the sale by
Opgroup or any Opgroup Subsidiary of materials, supplies, goods, services,
equipment or other assets providing for annual payments of $250,000 or more
(except for agreements made in the ordinary course of business and involving
investment banking, brokerage, or investment management services); (d) any joint
venture or strategic alliance agreement providing for annual payments of
$250,000 or more or involving an investment by Opgroup or any Opgroup Subsidiary
of $750,000 or more; (e) any agreement relating to the disposition or sale of
any business (whether by merger, sale of stock, sale of assets or otherwise);
(f) any agreement relating to indebtedness or the deferred purchase price of
property involving an aggregate principal amount of $250,000 or more; (g) any
license, franchise or similar agreement providing for annual payments of
$250,000 or more; (h) any agency, dealer, sales representative, marketing or
other similar agreement, providing for annual payments of $250,000 or more, (i)
any severance or similar arrangement in respect of any personnel of Opgroup and
any Opgroup Subsidiary that will result in any obligation (whether absolute or
contingent) of Opgroup, any Opgroup Subsidiary or any other Person to make any
payment to such personnel following termination of employment or consummation of
the transactions contemplated by this Agreement; (j) any contract or agreement
in which rights (including rights to receive cash or other consideration) are
granted, made exercisable or accelerated due to the execution or delivery of
this Agreement or the consummation of the transactions contemplated hereby; and
(k) any other agreement which involves annual payments in excess of $250,000 or
is not terminable without penalty by Opgroup or any Opgroup Subsidiary within
six months (each such contract, an "Opgroup Material Contract") and a complete
and correct list of all such Opgroup Material Contracts is set forth in Schedule
4.8.  To Opgroup's Knowledge, (i) each Opgroup Material Contract is in full
force and effect, and (ii) no event has occurred which would (with or without
the passage of time, notice or both) constitute a breach or default of any
material obligations of any party to such Opgroup Material Contract.

          Section 4.9.  Legal Proceedings.
                        -----------------

          Except as set forth on Schedule 4.9, there are no legal,
administrative, arbitral or other proceedings, claims, actions or governmental
or regulatory investigations of any nature that are pending or, to Opgroup's
Knowledge, have been threatened against Opfin, with respect to the Opgroup
Business, or Opgroup or any Opgroup Subsidiary or any of their respective
properties or assets or that challenge the validity or propriety of the
transactions contemplated by this Agreement.

          Section 4.10. Permits and Applicable Law.
                        --------------------------

               (a) Except as disclosed in Schedule 4.10(a), as of the Closing
     Date, Opgroup and the Opgroup Subsidiaries will hold all Permits that are
     required to conduct the Opgroup Business as it is currently being
     conducted.  As of such date, all Permits shall be

                                       18
<PAGE>
 
     valid and in good standing and shall not be the subject of any suspension,
     modification or revocation or proceedings related thereto.

               (b) Except as disclosed in Schedule 4.10(b), since April 30, 1993
     and except for normal examinations conducted by any Governmental Authority
     in the regular course of the Opgroup Business, no Governmental Authority
     has initiated any administrative proceeding or, to Opgroup's Knowledge,
     investigation into the Opgroup Business (including, without limitation, the
     Identified Funds).  A copy of all material correspondence with Governmental
     Authorities with respect to the Opgroup Business during the last year has
     been made available to TAG.

               (c) All proxy statements to be prepared for use by the Opgroup
     Public Investment Company Clients in connection with the transactions
     contemplated by this Agreement (other than any information provided or to
     be provided by TAG or PIMCO Advisors relating to themselves and their
     Affiliates expressly for use in the proxy statements) will not contain, at
     the times such proxy statements are furnished to the shareholders, or at
     the time of the meetings thereof, any untrue statement of a material fact,
     or omit to state any material fact required to make the statements therein,
     in light of the circumstances under which they were made, not misleading.

          Section 4.11.  Insurance.
                         ---------

          All of Opfin's, Opgroup's and the Opgroup Subsidiaries' material
insurance policies and bonds with respect to the Opgroup Business are listed in
Schedule 4.11. To Opgroup's Knowledge, each such insurance policy or bond is in
full force and effect, and neither Opfin nor Opgroup has received written notice
or any other indication from any insurer or agent of any proposed cancellation
of any such insurance policy or bond.

          Section 4.12.  Labor and Employment Matters.
                         ----------------------------

          Except as set forth in Schedule 4.12, (a) no collective bargaining
arrangement or agreement or similar arrangement or agreement with any labor
organization, or work rules or practices agreed to with any labor organization
or employee association, exists which is binding on Opgroup or any Opgroup
Subsidiary, (b) there are no unfair labor practice complaints pending against
Opgroup or any Opgroup Subsidiary before the National Labor Relations Board and
(c) there are no strikes, slowdowns, work stoppages, lockouts, or to Opgroup's
Knowledge threats thereof, by or with respect to any employees of Opgroup or any
Opgroup Subsidiary.

          Section 4.13.  Employee Benefit Plans; ERISA
                         -----------------------------

               (a) For purposes of this Agreement "Opgroup Benefit Plan" means
     all "employee benefit plans," as defined in Section 3(3) of ERISA, and any
     bonus or other incentive compensation, profit sharing, compensation,
     termination, stock option, stock appreciation right, restricted unit,
     restricted option, performance unit, retirement, deferred compensation,
     employment, severance, termination pay, retiree medical or retiree life
     insurance plan, agreement or other arrangement in effect at the date hereof
     for the benefit of any current or former employee or director of Opgroup or
     any Opgroup Subsidiary, and any trust or other funding arrangement relating
     thereto.  Schedule 4.13(a) contains a true and complete list or description
     of all Opgroup Benefit Plans other than those to be terminated or assumed
     by Opfin in the Spin-Off as described in Annex A.  With respect to each
     Opgroup

                                       19
<PAGE>
 
     Benefit Plan listed on Schedule 4.13(a), there has been delivered
     or made available to PIMCO Advisors copies of any:  (i) plans and related
     trust documents and amendments thereto; (ii) the most recent summary plan
     descriptions and the most recent annual report (including Schedule B);
     (iii) all other material employee communications; (iv) the most recent
     actuarial valuation; and (v) the most recent determination letter received
     from the IRS.

               (b) Except as set forth in Schedule 4.13(b), with respect to each
     Opgroup Benefit Plan, (i) such plan is in compliance in all material
     respects with all applicable laws, including ERISA and the Code; (ii) no
     condition exists that is reasonably expected to subject Opgroup or any
     Opgroup Subsidiary to a civil penalty under Section 502(i) of ERISA,
     liability under Section 4069 of ERISA or Sections 4971 through 4980E of the
     Code, the loss of a federal tax deduction under Section 404 of the Code, or
     any penalties or tax liability arising from the loss of qualification under
     Section 401(a) of the Code that is not reflected on the Opgroup Balance
     Sheets; (iii) each Opgroup Benefit Plan intended to qualify under Section
     401(a) of the Code has received a favorable determination letter from the
     IRS with respect to such qualification, and its related trust has been
     determined to be exempt from taxation under Section 501(a) of the Code;
     and, to Opgroup's Knowledge, nothing has occurred since the date of such
     letter that would adversely affect such qualification or exemption; (iv)
     there are no claims or legal actions or proceedings (other than routine
     claims for benefits) pending or, to Opgroup's Knowledge, threatened, with
     respect to any Opgroup Benefit Plan or against the assets of any Opgroup
     Benefit Plan; (v) none of Opgroup or any Opgroup Subsidiary or Opco LP has
     engaged in, or is a successor corporation to an entity that has engaged in,
     a transaction described in Section 4069 of ERISA; and (vi) no event has
     occurred under Sections 4041, 4043, 4062, 4063 and 4064 of ERISA during the
     current or any of the preceding five plan years that could subject Opgroup,
     any Opgroup Subsidiary, any Opgroup Benefit Plan to any liability.  Any
     Opgroup Benefit Plan which constitutes a "multiemployer plan" as defined in
     Section 3(37) of ERISA would not subject TAG or PIMCO Advisors to any
     liability.  All contributions prescribed by law or required under the
     Opgroup Benefit Plans have been made or accrued on the Opgroup Balance
     Sheets to the extent required by GAAP.

          Section 4.14.  Intellectual Property.
                         ---------------------

          Schedule 4.14 sets forth a complete and accurate list of all
trademark, service mark and copyright registrations, and patents and pending
applications therefor, in which Opgroup or any Opgroup Subsidiary has any right,
title or interest and which relate to the Opgroup Business ("Opgroup
Intellectual Property"), the jurisdictions in which the Opgroup Intellectual
Property has been registered or patented or in which an application for such
registration or patent has been filed, and any licenses, sublicenses and other
agreements in which Opgroup or any Opgroup Subsidiary grants a license to any
other Person to use such Opgroup Intellectual Property.  Except as set forth in
Schedule 4.14, no written notice has been received by Opgroup or its
Subsidiaries that the use by Opgroup or any of the Opgroup Subsidiaries of
Opgroup Intellectual Property in which they have any right, title or interest
infringes on any rights of any other Person nor, to Opgroup's Knowledge, has any
other Person infringed on a continuing basis any rights that Opgroup or any of
the Opgroup Subsidiaries have in the Opgroup Intellectual Property.

          Section 4.15.  Taxes.
                         -----

               (a) Each of Opgroup and the Opgroup Subsidiaries has duly and
     timely filed (or there has been duly and timely filed on its behalf) with
     the appropriate

                                       20
<PAGE>
 
     Governmental Authorities all Tax Returns in respect of Taxes required to be
     filed through the date as of which this representation is made (taking into
     account extensions). The information filed on behalf of Opgroup and the
     Opgroup Subsidiaries was complete and correct in all material respects.
     Except as set forth on Schedule 4.15(a), neither Opgroup nor any of the
     Opgroup Subsidiaries has requested any extension of time within which to
     file Tax Returns in respect of any Taxes, which Tax Returns have not been
     filed.

               (b) All material Taxes of Opgroup and the Opgroup Subsidiaries
     due to be paid on or prior to the Closing Date (taking into account
     extensions) have been paid or will be paid prior to the Closing Date or an
     adequate reserve has been (or, with respect to periods for which financial
     reports have not yet been prepared, will be) established therefor in
     accordance with GAAP.  Opgroup and the Opgroup Subsidiaries do not have any
     liability for Taxes in excess of such amounts so paid or reserves so
     established.

               (c) Except as set forth on Schedule 4.15(c), no material
     deficiencies for Taxes have been claimed, proposed or assessed by any
     Governmental Authority against Opgroup or the Opgroup Subsidiaries for any
     taxable year ended subsequent to December 31, 1990.  Except as set forth on
     Schedule 4.15(c), there are no pending or, to Opgroup's Knowledge,
     threatened audits, investigations or claims for or relating to any material
     additional liability in respect of Taxes against Opgroup or the Opgroup
     Subsidiaries, and there are no matters under discussion with any
     Governmental Authorities with respect to Taxes that in the reasonable
     judgment of Opgroup, the Opgroup Subsidiaries is likely to result in a
     material additional liability for Taxes for any of such companies.  Except
     as set forth on Schedule 4.15(c), none of Opgroup or the Opgroup
     Subsidiaries has been notified that any Governmental Authority intends to
     audit a Tax Return for any other period.  Except as set forth on Schedule
     4.15(c), no extension of a statute of limitations relating to Taxes is in
     effect with respect to Opgroup or the Opgroup Subsidiaries.

               (d) There are no liens or other Encumbrances upon the assets of
     Opgroup or any Opgroup Subsidiary for or arising from Taxes (except for
     statutory liens for Taxes not yet due and payable).

               (e) All material elections with respect to Taxes affecting
     Opgroup and the Opgroup Subsidiaries as of the date hereof are set forth on
     Schedule 4.15(e).  Opfin shall notify TAG of new elections with respect to
     Taxes, or changes in current elections with respect to Taxes, affecting
     Opgroup or the Opgroup Subsidiaries that are made prior to the Closing, and
     shall make no such election that would be adverse to TAG without the prior
     written consent of TAG.  None of Opgroup or the Opgroup Subsidiaries (i)
     has made or will make a deemed dividend election under Treasury Regulation
     Section 1.1502-32(f)(2) or a consent dividend election under Section 565 of
     the Code; (ii) has consented at any time under Section 341(f)(1) of the
     Code to have the provisions of Section 341(f)(2) of the Code apply to any
     disposition of any of Opgroup's or the Opgroup Subsidiaries' assets; (iii)
     has agreed, or is required, to make any adjustment under Section 481(a) of
     the Code by reason of a change in accounting method or otherwise; (iv) has
     made an election, or is required, to treat any asset of Opgroup or the
     Opgroup Subsidiaries as owned by another Person pursuant to the provisions
     of former Section 168(f)(8) of the Code or as "tax-exempt use property"
     within the meaning of Section 168 of the Code; or (v) has made any of the
     foregoing elections or is required to apply any of the foregoing rules
     under any comparable state or local income Tax provision.

                                       21
<PAGE>
 
               (f) All tax-sharing agreements or similar arrangements with
     respect to or involving Opgroup and the Opgroup Subsidiaries are identified
     on Schedule 4.15(f).

               (g) Opgroup is not a U.S. real property holding corporation as
     defined in Section 897 of the Code.

               (h) Neither Opgroup nor any of the Opgroup Subsidiaries has made
     or will, as a result of any event connected with the Merger or any other
     transaction contemplated by this Agreement, make or become obligated to
     make, any "excess parachute payment" as defined in Section 280G of the
     Code.

               (i) Neither Opgroup nor any of the Opgroup Subsidiaries has
     participated in or will participate in an international boycott within the
     meaning of Section 999 of the Code.

          Section 4.16.  Investment Companies, Managed Account Clients,
                         ----------------------------------------------
Distributors, Etc.
- ------------------

               (a) Schedule 4.16(a) sets forth a complete and accurate list of
     (i) each Opgroup Public Investment Company Client, (ii) each Opgroup
     Private Investment Company Client, (iii) each Opgroup Offshore Investment
     Company Client and (iv) each Opgroup Managed Account Client, and indicates
     the Run-Rate Revenues with respect to such clients as of October 31, 1996.
     Each Opgroup  Public Investment Company Client sponsored by Opgroup or its
     Affiliates is duly registered with the SEC as an investment company under
     the Investment Company Act.  Except as set forth in Schedule 4.16(a), no
     Opgroup Investment Company Client or Opgroup Managed Account Client in
     respect of which any Opgroup Subsidiary has accrued asset management or
     similar fees in excess of $100,000 during the twelve months ended October
     31, 1996, has, between such date and the date of this Agreement, to
     Opgroup's Knowledge, indicated in writing any intent to terminate any
     Advisory Agreement with any of the Opgroup Subsidiaries.  Opgroup provides
     no investment advice for compensation and is not a party to any contracts
     or agreements in which Opgroup agrees to act as an investment advisor,
     subadvisor, manager or act in a similar capacity.

               (b) True and correct copies of each Advisory Agreement pursuant
     to which any of the Opgroup Subsidiaries acts as investment adviser to the
     Opgroup Investment Company Clients have been made available to TAG.  Each
     such Advisory Agreement is in full force and effect with respect to the
     Opgroup Investment Company Client and Opgroup and the Opgroup Subsidiaries
     which are parties thereto.

               (c)(i) Shares of each Opgroup Public Investment Company Client
          sponsored by any Opgroup Subsidiaries have been duly registered under
          the Securities Act and applicable state securities laws, and the
          related registration statements were effective under the Securities
          Act and applicable state securities laws at all times when such
          effectiveness was required and no stop order suspending the
          effectiveness of any such registration statement has been issued.

                  (ii) No shares or other equity interests of any Opgroup
          Private Investment Company Client sponsored by any Opgroup
          Subsidiaries which have been offered or sold have been registered or
          qualified, as the case may be under the

                                       22
<PAGE>
 
          Securities Act or any other Securities Laws and no such registration
          or qualification was or is required.

                    (iii)  Shares or other equity interests of each Opgroup
          Offshore Investment Company Client sponsored by any Opgroup Subsidiary
          have been duly registered, or qualified, as the case may be, to the
          extent required under applicable Securities Laws.

               (d) Each Opgroup Investment Company Client sponsored by an
     Opgroup Subsidiary is duly organized and validly existing and in good
     standing under the laws of the jurisdiction of its organization and has the
     requisite corporate power and authority to own all its properties and
     assets and to carry on its business as it is now being conducted.

               (e) True and correct copies of each agreement pursuant to which
     any of the Opgroup Subsidiaries provides distribution services to any
     Opgroup Investment Company Client ("Opgroup Distribution Contract") have
     been made available to TAG.  Schedule 4.16(e) sets forth a list of each
     such Opgroup Distribution Contract.  Each Opgroup Distribution Contract is
     in full force and effect with respect to the Opgroup Subsidiaries which are
     parties thereto.

               (f) Each Identified Fund (other than the SBAM Funds) and, to the
     Knowledge of Opgroup, each SBAM Fund, is in compliance in all material
     respects with all applicable federal and state securities laws.  Each
     Opgroup Public Investment Company Client is in compliance in all material
     respects with applicable investment policies and restrictions.  Each
     Opgroup Public Investment Company Client has been managed in a manner
     consistent with the qualification of such Opgroup Public Investment Company
     Client's as a "regulated investment company" under Subchapter M of the
     Code.

          Section 4.17.  Bringdown.
                         ---------

               (a) From October 31, 1996 through the date hereof, to Opgroup's
     Knowledge, Opgroup and the Opgroup Subsidiaries have conducted their
     respective businesses substantially in accordance with the covenants set
     forth in Section 7.1(a).

               (b) From October 31, 1996 through the date hereof, except as
     otherwise disclosed in writing to TAG with specific reference to this
     Section 4.17, to Opgroup's Knowledge, there has occurred no event which
     could reasonably be expected to have an Opgroup Material Adverse Effect.

          Section 4.18.  Investment Company Status.
                         -------------------------

               (a) At and immediately after the Effective Time, (1) only the
     Trustee and Opco LP (through its beneficial interest in the Trust) will be
     the beneficial owner (within the meaning of Section 3(c)(1) of the
     Investment Company Act) of 10% or more of the New TAG Preferred and (2)
     Opco L.P. will not be (i) an "investment company" within the meaning of the
     Investment Company Act or (ii) excepted from such definition of "investment
     company" by reason of Section 3(c)(1) or 3(c)(7) of the Investment Company
     Act.

                                       23
<PAGE>
 
               (b) Opco L.P.  was not formed for the purpose of investing in TAG
     or otherwise participating in the Merger or the Spin-Off.

               (c) So long as TAG is excepted from the definition of "investment
     company" within the meaning of the Investment Company Act pursuant to
     Section 3(c)(1) of the Investment Company Act by virtue of having 45 or
     fewer "beneficial owners" of its outstanding securities immediately prior
     to the Effective Time, the Merger and the transactions contemplated thereby
     shall not cause TAG to lose such exception by virtue of having immediately
     after the Effective Time more than 100 "beneficial owners" of TAG
     securities within the meaning of Section 3(c)(1) of the Investment Company
     Act.

          Section 4.19.  Brokers.
                         -------

               Other than Goldman Sachs & Co., no broker, finder or similar
     intermediary has acted for or on behalf of, or is entitled to any broker's,
     finder's or similar fee or other commission from, Opfin or its Affiliates.

          Section 4.20.  Additional Fund Representations.
                         -------------------------------

               (a) To the Knowledge of Opgroup, there is no beneficial owner
     (within the meaning of the Exchange Act) of 5% of the outstanding voting
     securities of any closed-end Identified Fund.

               (b) To the Knowledge of Opgroup, no action has been taken, or is
     pending or proposed, to convert any closed-end Identified Fund into an
     open-end investment company.


                                   ARTICLE V.

                     REPRESENTATIONS AND WARRANTIES OF TAG
                     -------------------------------------

          TAG represents and warrants to each of Opgroup and Opfin, at the date
of this Agreement, and at the Closing Date, as follows:

          Section 5.1.  Organization and Related Matters.
                        --------------------------------

          TAG is a corporation duly organized, validly existing and in good
standing under the laws of the State of Delaware.  TAG has the corporate power
and authority to carry on its business as it is now being conducted and to own,
lease and operate all of its properties and assets, and is duly licensed or
qualified to do business in each jurisdiction in which the nature of the
business conducted by it or the character or location of the properties and
assets owned, leased or operated by it makes such qualification or licensing
necessary.  The copies of the organizational documents and any amendments
thereto of TAG heretofore delivered to Opfin are complete and correct copies of
such instruments as currently in effect.

          Section 5.2.  Authority; No Violation.
                        -----------------------

               (a) TAG has full corporate power and authority to execute and
     deliver this Agreement and take all actions necessary or appropriate to be
     taken by it to consummate

                                       24
<PAGE>
 
     the transactions contemplated hereby. Except as set forth on Schedule
     5.2(a), the execution and delivery of this Agreement and the consummation
     of the transactions contemplated hereby have been duly and validly approved
     by all requisite corporate action on the part of TAG and its shareholders,
     and no other corporate proceedings on the part of TAG are necessary to
     approve this Agreement and to consummate the transactions contemplated
     hereby. This Agreement has been duly and validly executed and delivered by
     TAG, and (assuming the due authorization, execution and delivery of this
     Agreement by Opgroup and Opfin) constitute a valid and binding obligation
     of TAG, enforceable against it in accordance with their terms, except as
     enforcement may be limited by general principles of equity whether applied
     in a court of law or a court of equity and by bankruptcy, insolvency,
     moratorium and similar laws affecting creditors' rights and remedies
     generally.

               (b) Neither the execution and delivery of this Agreement by TAG,
     nor the consummation of the Merger, nor compliance by TAG with any of the
     other terms or provisions hereof, will (i) violate any provision of its
     certificate of incorporation or bylaws or (ii) except as set forth in
     Schedule 5.2(b), and assuming that the consents and approvals required of
     Opgroup and Opfin in Sections 7.2 and 7.3 are duly obtained, (x) violate
     any Applicable Law, or (y) violate, conflict with, result in a breach of
     any provision of or the loss of any benefit under, constitute a default (or
     an event which, with notice or lapse of time, or both, would constitute a
     default) under, result in the termination of or a right of termination or
     cancellation under, accelerate the performance required by, or result in
     the creation of any material Encumbrance upon any of TAG's assets or any
     note, bond, mortgage, indenture, deed of trust, license, lease agreement or
     other instrument or obligation to which TAG is a party, or by which TAG or
     any of its properties or assets, may be bound.

          Section 5.3.  Consents and Approvals.
                        ----------------------

          Except for (a) consents, approvals and notices as are set forth in
Sections 7.2 and 7.3 and in Schedule 5.3, and (b) the applicable filings under
the HSR Act, no consents or approvals of or filings or registrations with any
Governmental Authority or any third party are necessary in connection with (i)
the execution and delivery by TAG of this Agreement and (ii) the consummation by
TAG of the transactions as contemplated hereby.

          Section 5.4.  Regulatory Documents.
                        --------------------

               (a) Since April 30, 1993, TAG has filed all Regulatory Documents,
     together with any amendments required to be made with respect thereto, that
     were required to be filed by it with any Governmental Authority, including
     the SEC, with respect to its business.

               (b) As of their respective dates, the Regulatory Documents filed
     with respect to TAG's business complied in all material respects with the
     requirements of the Securities Laws, and the rules and regulations of the
     SEC promulgated thereunder applicable to such Regulatory Documents, and
     none of such Regulatory Documents, as of their respective dates, contained
     any untrue statement of a material fact or omitted 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.  Where legally required to maintain such Regulatory Documents
     current, none of such Regulatory Documents contain any untrue statement of
     a material fact or omit to state a material fact

                                       25
<PAGE>
 
     required to be stated therein or necessary in order to make the statements
     therein, in light of the circumstances under which they are made, not
     misleading.

          Section 5.5.  Capitalization.
                        --------------

               (a) At the Closing Date, the authorized capital stock of TAG will
     consist of 50,000,000 shares of Common Stock, par value one cent ($.01) per
     share ("TAG Common Stock"), 9,512,089 shares of which will be issued and
     outstanding; and 10,000,000 shares of preferred stock, of which 2,028,386
     shares of TAG Series A Preferred Stock, par value one cent ($.01) per share
     ("TAG Series A Preferred Stock"), will be issued and outstanding, and
     2,839,742 shares of TAG Series B Preferred Stock, par value one cent ($.01)
     per share ("TAG Series B Preferred Stock"), will be issued and outstanding.
     The shares of TAG Common Stock, TAG Series A Preferred Stock and TAG Series
     B Preferred Stock are owned of record and, to TAG's Knowledge, beneficially
     by the holders listed on Schedule 5.5(a) in the respective amounts set
     forth opposite their names.  All of the outstanding shares of TAG capital
     stock (x) are duly and validly authorized and issued, fully paid and
     nonassessable and (y) have not been issued in violation of any preemptive
     right.  Except as set forth on Schedule 5.5(a) and as contemplated by this
     Agreement, (i) there are no outstanding options, warrants, calls, rights,
     commitments or agreements of any kind to which TAG is party or by which it
     is bound obligating it to issue, deliver or sell, or cause to be issued,
     delivered or sold, additional shares of the capital stock of any class or
     series of, or other equity interests in, TAG or any securities convertible
     or exchangeable into or evidencing the right to purchase any shares of
     capital stock of any class or series of, or other equity interests in, TAG,
     or obligating TAG to grant, extend or enter into any such option, warrant,
     call, right, commitment or agreement; (ii) there are no outstanding
     contractual obligations of TAG to repurchase, redeem or otherwise acquire
     any shares of capital stock of TAG; and (iii) there are no outstanding
     bonds, debentures, notes or other securities or instruments of TAG having
     the right to vote (or convertible into, or exchangeable for, securities
     having the right to vote) on any matter on which stockholders of TAG may
     vote.

               (b) At the Closing Date, all of the New TAG Preferred will be
     duly authorized for issuance and, upon issuance in the manner and for the
     consideration set forth in this Agreement, will be validly issued, fully
     paid and non-assessable and will not be issued in violation of any
     preemptive rights.  All of the shares of New TAG Preferred, when issued,
     will be free and clear of all Encumbrances (other than under the Securities
     Laws).  At the Closing Date, the shares of TAG Common Stock to be issued
     upon the conversion of the New TAG Preferred will have been duly authorized
     and, when issued as contemplated by TAG's certificate of incorporation,
     will be validly issued, fully paid and non-assessable and will not be
     issued in violation of any preemptive rights.

          Section 5.6.  Financial Statements.
                        --------------------

          TAG has previously delivered to Opfin copies of (a) the audited
statements of financial condition of TAG as of  December 31, 1994 and 1995
(collectively, the "TAG Balance Sheets") and the related audited statements of
operations, changes in stockholders' equity and cash flows for the period
November 16, 1994 through December 31, 1994 and for the year ended December 31,
1995, in each case accompanied by the audit report of Deloitte & Touche LLP
(with respect to the period ended December 31, 1994) and Price Waterhouse LLP
(with respect to the year ended December 31, 1995), independent public
accountants with respect to TAG and (b) the unaudited interim statements of
financial condition and related statements of operations, changes in

                                       26
<PAGE>
 
stockholders' equity and cash flows of TAG at or for the periods ended March 31,
June 30 and September 30, 1996.  The balance sheets referred to in the previous
sentence (including the related notes, where applicable) fairly present the
financial condition of TAG as of the dates thereof, and the other financial
statements referred to in the preceding sentence fairly present (subject, in the
case of the unaudited statements, to recurring audit adjustments normal in
nature and amount) the results of the operations, cash flows and changes in
stockholder's equity of TAG, for the respective fiscal periods therein set
forth; each of such statements (including the related notes, where applicable)
has been prepared in accordance with GAAP consistently applied during the
periods involved and are consistent with the books and records of TAG.

          Section 5.7.  Material Contracts.
                        ------------------

          Opfin has been provided true and correct copies of each of the
following agreements as currently in effect, including all amendments and
modifications thereto, to which TAG will be a party or which TAG will be, or its
assets will be, bound at the Closing Date:  (a) any lease (whether of real or
personal property) providing for annual rentals of $250,000 or more; (b) any
agreement for the purchase of materials, supplies, goods, services, equipment or
other assets providing for annual payments of $250,000 or more; (c) any sales,
distribution or similar agreement providing for the sale by TAG of materials,
supplies, goods, services, equipment or other assets providing for annual
payments of $250,000 or more (except for agreements made in the ordinary course
of business and involving investment banking, brokerage, or investment
management services); (d) any joint venture or strategic alliance agreement
providing for annual payments of $250,000 or more or involving an investment by
TAG of $750,000 or more; (e) any agreement relating to the disposition or sale
of any business (whether by merger, sale of stock, sale of assets or otherwise);
(f) any agreement relating to indebtedness or the deferred purchase price of
property involving an aggregate principal amount of $250,000 or more; (g) any
license, franchise or similar agreement providing for annual payments of
$250,000 or more; (h) any agency, dealer, sales representative, marketing or
other similar agreement, providing for annual payments of $250,000 or more and
(i) any other agreement which involves annual payments in excess of $1 million
or is not terminable without penalty by TAG within six months (each such
contract, a "TAG Material Contract") and a complete and correct list of all such
TAG Material Contracts is set forth in Schedule 5.7.  To  TAG's Knowledge, (i)
each TAG Material Contract is in full force and effect, and (ii) no event has
occurred which would (with or without the passage of time, notice or both)
constitute a breach or default of any material obligations of any other party to
such TAG Material Contract.

          Section 5.8.  Brokers.
                        -------

          Other than Lazard, Freres & Co. LLC, no broker, finder or similar
intermediary has acted for or on behalf of, or is entitled to any broker's,
finder's or similar fee or other commission from TAG or its Affiliates in
connection with this Agreement or the Merger.

          Section 5.9.  Legal Proceedings.
                        -----------------

          Except as set forth on Schedule 5.9, there are no legal,
administrative, arbitral or other proceedings, claims, actions or governmental
or regulatory investigations of any nature that are pending or, to TAG's
Knowledge, have been threatened against TAG, PIMCO Advisors or their properties
or assets or that challenge the validity or propriety of the transactions
contemplated by this Agreement.

                                       27
<PAGE>
 
          Section 5.10. Permits and Applicable Law.
                        --------------------------

               (a) Except as disclosed in Schedule 5.10(a), as of the Closing
     Date, TAG will hold all Permits that are material to its business.  As of
     such date, all Permits will be valid and in good standing and are not the
     subject of any suspension, modification or revocation or proceedings
     related thereto.

               (b) Except as disclosed in Schedule 5.10(b), since November 15,
     1994 and except for normal examinations conducted by any Governmental
     Authority in the regular course of the business of TAG, no Governmental
     Authority has initiated any administrative proceeding or, to TAG's
     Knowledge, investigation into its business.  A copy of all material
     correspondence with Governmental Authorities during the last year has been
     made available to Opfin.

               (c) The information provided or to be provided in writing by TAG
     relating to it and its Affiliates expressly for use in the proxy statements
     to be furnished to shareholders of the Opgroup Public Investment Company
     Clients in connection with the transactions contemplated by this Agreement
     will not contain, at the times such proxy statements are furnished to the
     shareholders or at the times of the meetings thereof, any untrue statement
     of a material fact, or omit to state any material fact required to be
     stated therein or necessary in order to make the statements made therein,
     in light of the circumstances under which they are made, not misleading.

          Section 5.11.  Insurance.
                         ---------

          All of TAG's material insurance policies and bonds are listed in
Schedule 5.11. To the Knowledge of TAG, each such insurance policy or bond is in
full force and effect, and TAG has received no written notice or any other
indication from any insurer or agent of any proposed cancellation of any such
insurance policy or bond.

          Section 5.12.  Intellectual Property.
                         ---------------------

          Except as set forth in Schedule 5.12, TAG has no right, title or
interest to any trademarks, service marks, copyright registrations, and patents
and pending applications therefor.   No written notice has been received by TAG
that the use by TAG of any such intellectual property in which it has any right,
title or interest infringes on any rights of any other Person nor, to TAG's
Knowledge, has any other Person infringed on a continuing basis any rights that
TAG has in the such intellectual property.

          Section 5.13.  Taxes.
                         -----

               (a) TAG has duly and timely filed (or there has been duly and
     timely filed on its behalf) with the appropriate Governmental Authorities
     all Tax Returns in respect of Taxes required to be filed through the date
     as of which this representation is made (taking into account extensions).
     The information filed on behalf of TAG was complete and correct in all
     material respects.  Except as set forth on Schedule 5.13(a), TAG has not
     requested any extension of time within which to file Tax Returns in respect
     of any Taxes, which Tax Returns have not been filed.

                                       28
<PAGE>
 
               (b) All material Taxes of TAG due to be paid on or prior to the
     Closing Date (taking into account extensions) have been paid or will be
     paid prior to the Closing Date or an adequate reserve has been (or, with
     respect to periods for which financial reports have not yet been prepared,
     will be) established therefor in accordance with GAAP.  TAG does not have
     any liability for Taxes in excess of such amounts so paid or reserves so
     established.

               (c) Except as set forth on Schedule 5.13(c), no material
     deficiencies for Taxes have been claimed, proposed or assessed by any
     Governmental Authority against TAG for any taxable year ended subsequent to
     December 31, 1990.  Except as set forth on Schedule 5.13(c), there are no
     pending or, to TAG's Knowledge, threatened audits, investigations or claims
     for or relating to any material additional liability in respect of Taxes
     against TAG, and there are no matters under discussion with any
     Governmental Authorities with respect to Taxes that in the reasonable
     judgment of TAG is likely to result in a material additional liability for
     Taxes.  Except as set forth on Schedule 5.13(c), TAG has not been notified
     that any Governmental Authority intends to audit a Tax Return for any other
     period.  Except as set forth on Schedule 5.13(c), no extension of a statute
     of limitations relating to Taxes is in effect with respect to TAG.

               (d) There are no liens or other Encumbrances upon the assets of
     TAG for or arising from Taxes (except for statutory liens for Taxes not yet
     due and payable).

               (e) All material elections with respect to Taxes affecting TAG as
     of the date hereof are set forth on Schedule 5.13(e).  TAG shall notify
     Opfin of any new elections with respect to Taxes, or changes in current
     elections with respect to Taxes, affecting TAG  which shall be made prior
     to the Closing, and shall make no such election that would be adverse to
     the Opgroup Shareholders without the prior written consent of Opfin.  TAG
     (i) has not made and will not make a deemed dividend election under
     Treasury Regulation Section 1.1502-32(f)(2) or a consent dividend election
     under Section 565 of the Code; (ii) has not consented at any time under
     Section 341(f)(1) of the Code to have the provisions of Section 341(f)(2)
     of the Code apply to any disposition of any of TAG's assets; (iii) has not
     agreed, and is not required, to make any adjustment under Section 481(a) of
     the Code by reason of a change in accounting method or otherwise; (iv) has
     not made an election, and is not required, to treat any asset of TAG as
     owned by another Person pursuant to the provisions of former Section
     168(f)(8) of the Code or as "tax-exempt use property" within the meaning of
     Section 168 of the Code; or (v) has not made any of the foregoing elections
     and is not required to apply any of the foregoing rules under any
     comparable state or local income Tax provision.

               (f) All tax-sharing agreements or similar arrangements with
     respect to or involving TAG are identified on Schedule 5.13(f).

               (g) TAG is not a U.S. real property holding corporation as
     defined in Section 897 of the Code.

               (h) TAG has not made and will not, as a result of any event
     connected with the Merger or any other transaction contemplated by this
     Agreement, make or become obligated to make, any "excess parachute payment"
     as defined in Section 280G of the Code.

                                       29
<PAGE>
 
               (i) TAG has not participated in and will not participate in an
     international boycott within the meaning of Section 999 of the Code.

          Section 5.14.  Section 15 of the Investment Company Act.
                         ----------------------------------------

          Neither TAG nor any of its Affiliates has any express or implied
understanding or arrangement which would impose an unfair burden on any of the
Opgroup Public Investment Company Clients or would in any way violate Section
15(f) of the Investment Company Act as a result of the Merger.

          Section 5.15.  No Material Adverse Effect.
                         --------------------------

          From September 30, 1996 through the date hereof, except as disclosed
in writing to Opfin with specific reference to this Section 5.15, to TAG's
Knowledge, there has occurred no event which could reasonably be expected to
have a TAG Material Adverse Effect.

          Section 5.16.  Bringdown.
                         ---------

          From September 30, 1996 through the date hereof, except as provided on
Schedule 5.16, to TAG's Knowledge, TAG has conducted its business substantially
in accordance with the covenants set forth in Section 7.1(b).


                                  ARTICLE VI.


               REPRESENTATIONS AND WARRANTIES OF PIMCO ADVISORS
               ------------------------------------------------

          PIMCO Advisors represents and warrants to each of Opgroup and Opfin at
the date of this Agreement, and at the Closing Date, as follows:

          Section 6.1.  Organization.
                        ------------

          PIMCO Advisors is a limited partnership, validly existing and in good
standing under the laws of the State of Delaware.  Each PIMCO Advisors
Subsidiary that is a corporation or a  partnership is validly existing and in
good standing under the jurisdiction of its organization.  Each of PIMCO
Advisors and the PIMCO Advisors Subsidiaries has the partnership or corporate
power and authority, as the case may be, to carry on its business as it is now
being conducted and to own, lease and operate all of its properties and assets,
and is duly licensed or qualified to do business in each jurisdiction in which
the nature of the business conducted by it or the character or location of the
properties and assets owned, leased or operated by it makes such qualification
or licensing necessary.  A complete and correct copy of the PIMCO Advisors
partnership agreement and of the certificate of incorporation, by-laws or
partnership agreement of each PIMCO Advisors Subsidiary have been made available
to Opfin.

          Section 6.2.  Authority; No Violation.
                        -----------------------

               (a) PIMCO Advisors has full partnership power and authority to
     execute and deliver this Agreement and take all actions necessary or
     appropriate to be taken by it to consummate the transactions contemplated
     hereby.  Except as set forth on Schedule 6.2(a), the execution and delivery
     of this Agreement and the consummation of the transactions

                                       30
<PAGE>
 
     contemplated hereby have been duly and validly approved by all requisite
     partnership action on the part of PIMCO Advisors and its unitholders, and
     no other partnership proceedings on the part of PIMCO Advisors or its
     unitholders or any PIMCO Advisors Subsidiary or their unitholders or
     shareholders, as the case may be, are necessary to approve this Agreement
     and to consummate the transactions contemplated hereby. This Agreement has
     been duly and validly executed and delivered by PIMCO Advisors, and
     (assuming the due authorization, execution and delivery of this Agreement
     by Opgroup and Opfin) constitutes a valid and binding obligation of PIMCO
     Advisors, enforceable against it in accordance with its terms, except as
     enforcement may be limited by general principles of equity whether applied
     in a court of law or a court of equity and by bankruptcy, insolvency,
     moratorium and similar laws affecting creditors' rights and remedies
     generally.

               (b) Neither the execution and delivery of this Agreement by PIMCO
     Advisors, nor the consummation by PIMCO Advisors of the transactions
     contemplated hereby, nor compliance by PIMCO Advisors with any of the terms
     or provisions hereof, will (i) violate any provision of any partnership
     agreement, certificate or incorporation or bylaws of PIMCO Advisors or any
     of the PIMCO Advisors Subsidiaries or (ii) except as set forth in Schedule
     6.2(b), and assuming that the consents and approvals required of Opfin,
     Opco LP and Opgroup in Sections 7.2 and 7.3 are duly obtained, (x) violate
     any Applicable Law, or (y) violate, conflict with, result in a breach of
     any provision of or the loss of any benefit under, constitute a default (or
     an event which, with notice or lapse of time, or both, would constitute a
     default) under, result in the termination of or a right of termination or
     cancellation under, accelerate the performance required by, or result in
     the creation of any material Encumbrance upon any of PIMCO Advisors' or any
     PIMCO Advisors Subsidiary's properties or assets, or any note, bond,
     mortgage, indenture, deed of trust, license, lease agreement or other
     instrument or obligation to which PIMCO Advisors or any of the PIMCO
     Advisors Subsidiaries is a party, or by which PIMCO Advisors or any of the
     PIMCO Advisors Subsidiaries or any of their properties or assets, may be
     bound.

          Section 6.3.  Consents and Approvals.
                        ----------------------

          Except for (a) such consents, approvals and notices as are set forth
in Sections 7.2 and 7.3 and in Schedule 6.3, and (b) the applicable filings
under the HSR Act, no consents or approvals of or filings or registrations with
any Governmental Authority or any third party are necessary in connection with
(i) the execution and delivery by PIMCO Advisors of this Agreement and (ii) the
consummation by PIMCO Advisors of the transactions contemplated hereby.

          Section 6.4.  Regulatory Documents.
                        --------------------

               (a) Since November 15, 1994,  PIMCO Advisors and each PIMCO
     Advisors Subsidiary has timely filed all Regulatory Documents, together
     with any amendments required to be made with respect thereto, that were
     required to be filed by them with any Governmental Authority, including the
     SEC.

               (b) At their respective dates, the Regulatory Documents of PIMCO
     Advisors and each PIMCO Advisors Subsidiary complied in all material
     respects with the requirements of the Securities Laws, as the case may be,
     and the rules and regulations of the SEC promulgated thereunder applicable
     to such Regulatory Documents, and none of such Regulatory Documents, as of
     their respective dates, contained any untrue statement of a material fact
     or omitted to state a material fact required to be stated therein or
     necessary in

                                       31
<PAGE>
 
     order to make the statements therein, in light of the circumstances under
     which they were made, not misleading. Where legally required to maintain
     such Regulatory Documents current, none of such Regulatory Documents
     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 are
     made, not misleading.

          Section 6.5.  Capitalization.
                        --------------

          At the date of this Agreement, PIMCO Advisors has issued and
outstanding 800,000 units of general partner interest ("GP Units") and
40,146,155 Class A Units and 32,964,759 Class B Units.  All of PIMCO Advisors'
outstanding units of partnership interest have been duly issued pursuant to its
partnership agreement, are fully paid and nonassessable (except as provided in
Section 17-607 or former Section 17-608 of the Delaware Revised Uniform Limited
Partnership Act) and have not been issued in violation of any preemptive right.
Except as set forth on Schedule 6.5, (i) there are no outstanding options,
warrants, calls, rights, commitments or agreements of any kind to which PIMCO
Advisors or any PIMCO Advisors Subsidiary is party or by which any of them is
bound obligating it to issue, deliver or sell, or cause to be issued, delivered
or sold, additional units of the partnership interest of any class or series of,
or other equity interests in, PIMCO Advisors or any PIMCO Advisors Subsidiary,
or any securities convertible or exchangeable into or evidencing the right to
purchase any units of partnership interest of any class or series of, or other
equity interests in, PIMCO Advisors or any PIMCO Advisors Subsidiary, or
obligating PIMCO Advisors or any PIMCO Advisors Subsidiary to grant, extend or
enter into any such option, warrant, call, right, commitment or agreement; (ii)
there are no outstanding contractual obligations of PIMCO Advisors or any PIMCO
Advisors Subsidiary to repurchase, redeem or otherwise acquire any shares of
capital stock of PIMCO Advisors or any PIMCO Advisors Subsidiary; and (iii)
there are no outstanding bonds, debentures, notes or other securities or
instruments of PIMCO Advisors or any PIMCO Advisors Subsidiary having the right
to vote (or convertible into, or exchangeable for, securities having the right
to vote) on any matter on which unitholders or shareholders, as the case may be,
of PIMCO Advisors or any PIMCO Advisors Subsidiary may vote.

          Section 6.6.  Financial Statements.
                        --------------------

          PIMCO Advisors has previously delivered to Opfin copies of (a) the
audited consolidated statements of financial condition of PIMCO Advisors as of
December 31, 1994 and 1995 (collectively, the "PIMCO Advisors Balance Sheets")
and the related audited statements of operations, changes in owners' equity and
cash flows for the years then ended, in each case accompanied by the audit
report of Deloitte & Touche LLP, independent public accountants with respect to
PIMCO Advisors and (b) the unaudited interim statements of financial condition
and related statements of operations, changes in owners' equity and cash flows
of PIMCO Advisors at or for the periods ended March 31, June 30 and September
30, 1996.  Each of the balance sheets referred to in the previous sentence
(including the related notes, where applicable) present fairly the consolidated
financial position of PIMCO Advisors as of the dates thereof, and the other
financial statements referred to in the previous sentence present fairly
(subject, in the case of the unaudited statements, to recurring audit
adjustments normal in nature and amount) the consolidated results of operations,
cash flows and changes in unitholders' equity of PIMCO Advisors, for the
respective fiscal periods therein set forth; each of such statements (including
the related notes, where applicable) has been prepared in accordance with GAAP
consistently applied during the periods involved and are consistent with the
books and records of PIMCO Advisors.

                                       32
<PAGE>
 
          Section 6.7.  Ineligible Persons.
                        ------------------

          Neither PIMCO Advisors nor any "affiliated person" (as defined in the
Investment Company Act) thereof is ineligible pursuant to Section 9(a) or 9(b)
of the Investment Company Act to serve as an investment adviser (or in any other
capacity contemplated by the Investment Company Act) to a registered investment
company.  Neither PIMCO Advisors nor any "associated person" (as defined in the
Advisers Act) of PIMCO Advisors, is ineligible pursuant to Section 203 of the
Advisers Act to serve as an investment adviser or as an associated person to a
registered investment adviser.  Neither PIMCO Advisors nor any "associated
person" (as defined in the Exchange Act) thereof, is ineligible pursuant to
Section 15(b) of the Exchange Act to serve as a broker-dealer or as an
associated person to a registered broker-dealer.

          Section 6.8.  Material Contracts.
                        ------------------

          There have been made available to Opfin copies of each of the
following agreements to which PIMCO Advisors or any PIMCO Advisors Subsidiary is
a party or by which any of them is bound:  (a) any lease (whether of real or
personal property) providing for annual rentals of $1 million or more; (b) any
agreement for the purchase of materials, supplies, goods, services, equipment or
other assets providing for annual payments of $1 million or more; (c) any sales,
distribution or similar agreement providing for the sale by PIMCO Advisors or
any PIMCO Advisors Subsidiary of materials, supplies, goods, services, equipment
or other assets providing for annual payments of $1 million or more (except for
agreements made in the ordinary course of business and involving investment
banking, brokerage, or investment management services); (d) any joint venture or
strategic alliance agreement providing for annual payments of $1 million or more
or involving an investment by PIMCO Advisors or any PIMCO Advisors Subsidiary of
$1.5 million or more; (e) any agreement relating to the disposition or sale of
any business (whether by merger, sale of stock, sale of assets or otherwise);
(f) any agreement relating to indebtedness or the deferred purchase price of
property involving an aggregate principal amount of $1 million or more; (g) any
license, franchise or similar agreement providing for annual payments of $1
million or more; (h) any agency, dealer, sales representative, marketing or
other similar agreement, providing for annual payments of $1 million or more and
(i) any other agreement which involves annual payments in excess of $1 million
or is not terminable without penalty by PIMCO Advisors or any PIMCO Advisors
Subsidiary within six months (each such contract, a "PIMCO Advisors Material
Contract") and a complete and correct list of all such PIMCO Advisors Material
Contracts is set forth in Schedule 6.8.  To  PIMCO Advisors' Knowledge, (i) each
PIMCO Advisors Material Contract is in full force and effect, and (ii) no event
has occurred which would (with or without the passage of time, notice or both)
constitute a breach or default of any material obligations of any other party to
such PIMCO Advisors Material Contract.

          Section 6.9.  No Broker.
                        ---------

          Other than Lazard, Freres & Co. LLC, no broker, finder or similar
intermediary has acted for or on behalf of, or is entitled to any broker's,
finder's or similar fee or other commission from PIMCO Advisors or any of its
Affiliates in connection with this Agreement or the Merger.

          Section 6.10. Legal Proceedings.
                        -----------------

          Except as set forth on Schedule 6.10, there are no legal,
administrative, arbitral or other proceedings, claims, actions or governmental
or regulatory investigations of any nature that are pending or, to PIMCO
Advisors' Knowledge, have been threatened against TAG, PIMCO Advisors, 

                                       33
<PAGE>
 
any PIMCO Advisors Subsidiary or their respective properties or assets or that
challenge the validity or propriety of the transactions contemplated by this
Agreement.

          Section 6.11.  Permits and Applicable Law.
                         --------------------------

               (a) Except as disclosed in Schedule 6.11(a), PIMCO Advisors and
     each PIMCO Advisors Subsidiary holds all Permits that are material to the
     lawful ownership and use of its properties and assets and the conduct of
     its business.  All such Permits are valid and in good standing and are not
     subject to any suspension, modification or revocation or proceedings
     related thereto.

               (b) Except as disclosed in Schedule 6.11(b), since November 15,
     1994 and except for normal examinations conducted by any Governmental
     Authority in the regular course of the business of PIMCO Advisors or any
     PIMCO Advisors Subsidiary, no Governmental Authority has initiated any
     administrative proceeding or, to the best of such PIMCO Advisors'
     Knowledge, investigation into the business or operations of PIMCO Advisors
     or the PIMCO Advisors Subsidiaries.  A copy of all material correspondence
     with Governmental Authorities during the last year with respect to PIMCO
     Advisors or any PIMCO Advisors Subsidiary has been made available to Opfin.

               (c) The information provided or to be provided in writing by
     PIMCO Advisors relating to it and its Affiliates expressly for use in the
     proxy statements to be furnished to shareholders of the Opgroup Public
     Investment Company Clients in connection with the transactions contemplated
     by this Agreement will not contain, at the times such proxy statements are
     furnished to the shareholders or at the times of the meetings thereof, any
     untrue statement of a material fact, or omit to state any material fact
     required to be stated therein or necessary in order to make the statements
     made therein, in light of the circumstances under which they are made, not
     misleading.

          Section 6.12.  Insurance.
                         ---------

          All of PIMCO Advisors' and PIMCO Advisors Subsidiaries' material
insurance policies and bonds are listed in Schedule 6.12.  To the Knowledge of
PIMCO Advisors, each such insurance policy or bond is in full force and effect,
and neither PIMCO Advisors nor any PIMCO Advisors Subsidiary has received
written notice or any other indication from any insurer or agent of any proposed
cancellation of any such insurance policy or bond.

          Section 6.13.  Labor and Employment Matters.
                         ----------------------------

          Except as set forth in Schedule 6.13, (a) no collective bargaining
arrangement or agreement or similar arrangement or agreement with any labor
organization, or work rules or practices agreed to with any labor organization
or employee association, exists which is binding on PIMCO Advisors or any PIMCO
Advisors Subsidiary, (b) there are no unfair labor practice complaints pending
against PIMCO Advisors or any PIMCO Advisors Subsidiary before the National
Labor Relations Board and (c) there are no strikes, slowdowns, work stoppages,
lockouts, or to the knowledge of PIMCO Advisors threats thereof, by or with
respect to any employees of PIMCO Advisors or any PIMCO Advisors Subsidiary.

                                       34
<PAGE>
 
          Section 6.14.  Employment Benefit Plans; ERISA.
                         -------------------------------

               (a) Schedule 6.14(a) contains a true and complete list or
     description of all "employee benefit plans" as defined in Section 3(3) of
     ERISA, and any bonus or other incentive compensation, profit sharing,
     compensation, termination, stock option, stock appreciation right,
     restricted unit, restricted option, performance unit, retirement, deferred
     compensation, employment, severance, termination pay, retiree medical or
     retiree life insurance plan, agreement, fund or other arrangement in effect
     at the date hereof for the benefit of any current or former employee or
     director of PIMCO Advisors or any PIMCO Advisors Subsidiary, and any trust
     or other funding arrangement relating thereto (each a "PIMCO Advisors
     Benefit Plan").  With respect to each of such PIMCO Advisors Benefit Plan,
     there has been delivered or made available to Opfin, as applicable, copies
     of any:  (i) plans and related trust documents and amendments thereto; (ii)
     the most recent summary plan descriptions and the most recent annual report
     (including Schedule B); (iii) all other material employee communications;
     (iv) the most recent actuarial valuation; and (v) the most recent
     determination letter received from the IRS.

               (b) Except as set forth on Schedule 6.14(b), with respect to each
     PIMCO Advisors Benefit Plan, (i) such plan is in compliance in all material
     respects with all applicable laws, including ERISA and the Code; (ii) no
     condition exists that is reasonably expected to subject PIMCO Advisors or
     any PIMCO Advisors Subsidiary to a civil penalty under Section 502(i) of
     ERISA, liability under Sections 4971 through 4980E of the Code, the loss of
     a federal tax deduction under Section 404 of the Code, or any penalties or
     tax liability arising from the loss of qualification under Section 401(a)
     of the Code that is not reflected on the PIMCO Advisors Balance Sheets;
     (iii) each PIMCO Advisors Benefit Plan intended to qualify under Section
     401(a) of the Code has received a favorable determination letter from the
     IRS with respect to such qualification, and its related trust has been
     determined to be exempt from taxation under Section 501(a) of the Code;
     and, to PIMCO Advisors Knowledge, nothing has occurred since the date of
     such letter that would adversely affect such qualification or exemption;
     (iv) there are no claims or legal actions or proceedings (other than
     routine claims for benefits) pending or, to PIMCO Advisors' Knowledge,
     threatened, with respect to any PIMCO Advisors Benefit Plan or against the
     assets of any PIMCO Advisors Benefit Plan; (v) neither PIMCO Advisors nor
     any PIMCO Advisors Subsidiary has engaged in, or is a successor or parent
     corporation to an entity that has engaged in, a transaction described in
     Section 4069 of ERISA; and (vi) no event has occurred under Sections 4041,
     4043, 4062, 4063 and 4064 of ERISA during the current or any of the
     preceding five plan years that could subject PIMCO Advisors, any PIMCO
     Advisors Subsidiary, any PIMCO Advisors Benefit Plan or any officer or
     director of any of PIMCO Advisors or any PIMCO Advisors Subsidiary to any
     liability.  Any PIMCO Advisors Benefit Plan which constitutes a
     "multiemployer plan" as defined in Section 3(37) of ERISA would not subject
     Opgroup or Opgroup to any material liability.  All contributions prescribed
     by law or required under the PIMCO Advisors Benefit Plans have been made or
     accrued on the PIMCO Advisors Balance Sheets to the extent required by
     GAAP.

          Section 6.15.  Intellectual Property.
                         ---------------------

          Schedule 6.15 sets forth a complete and accurate list of all material
trademark, service mark and copyright registrations, and patents and pending
applications therefor, in which PIMCO Advisors or any PIMCO Advisors Subsidiary
has any right, title or interest, the jurisdictions in which such intellectual
property has been registered or patented or in which an application for

                                       35
<PAGE>
 
such registration or patent has been filed, and any licenses, sublicenses and
other agreements in which PIMCO Advisors or any PIMCO Advisors Subsidiary grants
a license to any other Person to use such intellectual property. Except as set
forth in Schedule 6.15, to the Knowledge of PIMCO Advisors, no written notice
has been received by PIMCO Advisors or any PIMCO Advisors Subsidiary that the
use by PIMCO Advisors or any PIMCO Advisors Subsidiary of such intellectual
property in which they have any right, title or interest infringes on any rights
of any other Person nor, to the Knowledge of PIMCO Advisors, has any other
Person infringed on a continuing basis any rights that PIMCO Advisors or any
PIMCO Advisors Subsidiary have in such intellectual property.

          Section 6.16.  Taxes.
                         -----

               (a) Except as disclosed on Schedule 6.16, PIMCO Advisors and each
     PIMCO Advisors Subsidiary has (i) properly prepared and timely filed (or
     there has been filed on its behalf) with the appropriate Governmental
     Authorities all Tax Returns required to be filed through the date as of
     which this representation is made, and all such Tax Returns were true and
     correct in all material respects, and (ii) duly paid in full or will pay in
     full prior to the Closing or has made provision in accordance with GAAP (or
     there has been paid or provision has been made on their behalf) for the
     payment of, all material Taxes due to be paid on or prior to the Closing
     Date (taking into account extensions).

               (b) There are no liens or other Encumbrances upon the assets of
     PIMCO Advisors or any PIMCO Advisors Subsidiary for or arising from Taxes
     except for statutory liens for Taxes not yet due.

               (c) PIMCO Advisors is not a "foreign person" within the meaning
     of Section 1445 of the Code.

          Section 6.17.  Investment Companies, Managed Account Clients,
                         ----------------------------------------------
Distributors, Etc.
- ------------------

               (a) Schedule 6.17(a) sets forth a complete and accurate list of
     (i) each PIMCO Advisors Public Investment Company Client, (ii) each PIMCO
     Advisors Private Investment Company Client, (iii) each PIMCO Advisors
     Offshore Investment Company Client and (iv) each PIMCO Advisors Managed
     Account Client, in each case who is a PIMCO Advisors Material Client. For
     purposes of this Section, a "PIMCO Advisors Material Client" is any Person
     in respect of which PIMCO Advisors or any PIMCO Advisors Subsidiary have
     accrued asset management or similar fees in excess of $375,000 during the
     nine months ended September 30, 1996.  Each PIMCO Advisors Public
     Investment Company Client sponsored by PIMCO Advisors or its Affiliates is
     duly registered with the SEC as an investment company under the Investment
     Company Act.  Except as set forth in Schedule 6.17(a), no PIMCO Advisors
     Investment Company Client or PIMCO Advisors Managed Account Client that is
     a PIMCO Material Client has, prior to the date of this Agreement, to PIMCO
     Advisors' Knowledge, indicated in writing any intent to terminate any
     Advisory Agreement with PIMCO Advisors or any of the PIMCO Advisors
     Subsidiaries.

               (b) True and correct copies of each Advisory Agreement pursuant
     to which PIMCO Advisors or any of the PIMCO Advisors Subsidiaries acts as
     investment adviser to the PIMCO Advisors Investment Company Clients have
     been made available to Opfin.  Each such Advisory Agreement is in full
     force and effect with respect to the PIMCO Advisors Investment Company
     Client and PIMCO Advisors and the PIMCO Advisors Subsidiaries which are
     parties thereto.

                                       36
<PAGE>
 
               (c)(i) Shares of each PIMCO Advisors Public Investment Company
     Client sponsored by PIMCO Advisors or its Affiliates have been duly
     registered under the Securities Act and applicable state securities laws,
     and the related registration statements were effective under the Securities
     Act and applicable state securities laws at all times when such
     effectiveness was required and no stop order suspending the effectiveness
     of any such registration statement has been issued.

                    (ii)   No shares or other equity interests of any PIMCO
          Advisors Private Investment Company Client sponsored by PIMCO Advisors
          or its Affiliates which have been offered or sold have been registered
          or qualified, as the case may be under the Securities Act or any other
          Securities Laws and no such registration or qualification was or is
          required.

                    (iii)  Shares or other equity interests of each PIMCO
          Advisors Offshore Investment Company Client sponsored by PIMCO
          Advisors or its Affiliates have been duly registered, or qualified, as
          the case may be, to the extent required under applicable Securities
          Laws.

               (d) Each PIMCO Advisors Investment Company Client sponsored by
     PIMCO Advisors or its Affiliates is duly organized and validly existing and
     in good standing under the laws of the jurisdiction of its organization and
     has the requisite corporate power and authority to own all its properties
     and assets and to carry on its business as it is now being conducted.

               (e) True and correct copies of each agreement pursuant to which
     PIMCO Advisors or any of the PIMCO Advisors Subsidiaries provides
     distribution services to any PIMCO Advisors Investment Company Client
     ("PIMCO Advisors Distribution Contract") have been made available to Opfin.
     Schedule 6.17(e) sets forth a list of each such PIMCO Advisors Distribution
     Contract.  Each PIMCO Advisors Distribution Contract is in full force and
     effect with respect to PIMCO Advisors and the PIMCO Advisors Subsidiaries
     which are parties thereto.

          Section 6.18.  Section 15 of the Investment Company Act.
                         ----------------------------------------

          Neither PIMCO Advisors nor any of its Affiliates has any express or
implied understanding or arrangement which would impose an unfair burden on any
of the Opgroup Public Investment Company Clients or would in any way violate
Section 15(f) of the Investment Company Act as a result of the Merger.

          Section 6.19.  No Material Adverse Effect.
                         --------------------------

          From September 30, 1996 through the date hereof, except as otherwise
disclosed in writing to Opfin with specific reference to this Section 6.19, to
the Knowledge of PIMCO Advisors, there has occurred no event which could
reasonably be expected to have a TAG Material Adverse Effect.

                                       37
<PAGE>
 
                                 ARTICLE VII.


                                   COVENANTS
                                   ---------

          Section 7.1.  Conduct of Business.
                        -------------------

               (a) During the period from the date hereof and continuing through
     the Closing Date, except as expressly contemplated or permitted by this
     Agreement or with the prior written consent of TAG, Opgroup and the Opgroup
     Subsidiaries shall  (1) carry on the Opgroup Business in the ordinary
     course; (2) use commercially reasonable efforts to preserve their present
     business organization and relationships with respect to the Opgroup
     Business; (3) use commercially reasonable efforts to keep available the
     present services of their employees related to the Opgroup Business (which
     efforts need not include materially increasing such employee's compensation
     except with respect to restricted unit rights as may be agreed by the
     parties); and (4) use commercially reasonable efforts to preserve their
     rights, franchises, goodwill and relations with clients and others with
     whom they conduct the Opgroup Business.  Without limiting the generality of
     the foregoing, except as expressly contemplated or permitted by this
     Agreement and Annex A or with the prior written consent of TAG, Opfin shall
     not permit Opgroup or any of the Opgroup Subsidiaries to:

                    (i)    create, renew, amend, terminate or cancel, or take
          any other action that may result in the creation, renewal, amendment,
          termination or cancellation of, any Opgroup Material Contract except
          in the ordinary course of business;

                    (ii)   adopt, amend, renew or terminate any Opgroup Benefit
          Plan or any other employee program, agreement, arrangement or policy
          between Opgroup, any Opgroup Subsidiary and one or more of their
          employees, other than in the ordinary course of business;

                    (iii)  commit any act or omission which constitutes a
          breach or default under any contract or license to which it is a party
          or by which it or any of its properties is bound the effect of which
          could reasonably be expected to cause an Opgroup Material Adverse
          Effect;

                    (iv)   waive any right or modify or amend any commitment
          other than in the ordinary course of business, or incur any material
          obligation;

                    (v)    incur, assume, or guarantee any indebtedness or
          liability for or in respect of borrowed money;

                    (vi)   make any material change to the total compensation of
          any employee of Opgroup or the Opgroup Subsidiaries;

                    (vii)  declare or pay any dividends or make any other
          distribution in cash or property in respect of its capital stock or
          partnership interests, other than normal and customary dividends or
          distributions (including special dividends or distributions
          customarily paid from time to time);

                                       38
<PAGE>
 
                    (viii)  voluntarily divest itself of the management of any
          mutual fund or other assets currently under management;

                    (ix)    acquire or agree to acquire in any manner, including
          by way of merger, consolidation, purchase of an equity interest or
          assets, any business or any corporation, partnership, association or
          other business organization or division thereof;

                    (x)     enter into any joint venture or partnership except
          as set forth on Schedule 7.1;

                    (xi)    create or permit the creation or attachment of any
          security interests, pledges, claims, liens, charges, encumbrances, or
          other rights or interests of any other Person except in the ordinary
          course of business;

                    (xii)   sell, assign, convey or transfer any assets other
          than in the ordinary course and for fair value, provided, however,
          that no consent shall be required for such sales, assignments,
          conveyances or transfers in the ordinary course for fair value and not
          in excess of $5.0 million in the aggregate, or for ordinary course
          investment activity involving assets under management; or

                    (xiii)  enter into any new line of business.

          (b) During the period from the date hereof and continuing through the
Closing Date, except as expressly contemplated or permitted by this Agreement or
Schedule 7.1(b) or with the prior written consent of Opfin, TAG shall not:

                    (i)     incur, assume, or guarantee any indebtedness or
          liability for or in respect of borrowed money;

                    (ii)    amend, alter or repeal any provision of its
          certificate of incorporation or bylaws;

                    (iii)   issue or repurchase any equity securities;

                    (iv)    effect any recapitalization, liquidation or
          dissolution;

                    (v)     enter into any merger or consolidation involving, or
          sell all or a substantial portion of its assets;

                    (vi)    enter into any business or activity other than the
          investment management business; or

                    (vii)   enter into any transaction with any shareholder of
          TAG or any Affiliate of any shareholder of TAG, except on arms' length
          terms.

          Section 7.2.  Section 15 of the Investment Company Act; Opfin
                        -----------------------------------------------
Covenants.
- ---------

               (a)  Opfin will use commercially reasonable efforts to obtain,
     as promptly as practicable, the approval of the Board of Directors or
     trustees, as applicable, and shareholders of each Opgroup Public Investment
     Company Client, pursuant to the provisions

                                       39
<PAGE>
 
     of Section 15 of the Investment Company Act, of a new Advisory Agreement
     with PIMCO Advisors or its Affiliate or of the assignment of its respective
     Advisory Agreement, as applicable.

               (b)  Opfin shall use best efforts to assure, prior to the
     Closing Date, the satisfaction of or exemption from the conditions set
     forth in Section 15(f) of the Investment Company Act with respect to each
     Opgroup Public Investment Company Client, including the receipt of
     exemptive relief from the SEC with respect to the status of the directors
     of each Opgroup Public Investment Company Client as "interested persons" of
     the entities referred to in Section 15(f)(1)(A). Subject to the exercise of
     independent discretion of the directors of the Identified Funds who are not
     "interested persons" thereof ("Independent Directors") to the extent
     contemplated by Section 16(b) of the Investment Company Act, Opgroup and
     Opfin shall use their commercially reasonable efforts to have nominated and
     elected to the boards of directors of the Identified Funds for which
     Salomon Brothers Asset Management, Inc. serves as an investment adviser
     (the "SBAM Funds") the requisite number of additional Independent Directors
     to fulfill the condition described in Section 15(f)(1) of the Investment
     Company Act, with one out of every two such new Independent Directors for
     each SBAM Fund to be an individual endorsed by TAG and, if an odd number of
     Independent Directors needs to be nominated and elected, with the final
     additional Independent Director to be endorsed jointly by TAG and Salomon
     Brothers Asset Management. Inc.

               (c) Opgroup shall use its commercially reasonable efforts to
     cause counsel for each of the Identified Funds to submit its memorandum to
     the directors of the Identified Funds and the Identified Fund's proxy
     statement relating in each case to the assignment caused by the Merger in
     advance to counsel for TAG and shall use its commercially reasonable
     efforts to cause the Identified Fund's counsel to make such changes in such
     memorandum and proxy statement as may be reasonably requested by TAG's
     counsel.

               (d) Opgroup will arrange for a meeting to be held within 30 days
     after the signing of this Agreement among TAG, the directors of each
     Identified Fund, counsel for the Identified Funds and counsel for the
     Independent Directors thereof at which TAG shall be allowed to present its
     credentials.  Opgroup will use its commercially reasonable efforts to take
     such other actions as shall entitle the Identified Fund's directors to
     conclude that the approval of the assignment of each Identified Fund's
     investment advisory contract pursuant to the Merger is consistent with the
     business judgment and fiduciary obligation of the directors and that such
     assignment is in the best interests of the Identified Fund's shareholders
     and Opgroup shall use its commercially reasonable efforts to cause each
     Identified Fund's counsel so to advise said directors.

          Section 7.3.  Non-Investment Company Advisory Agreement Consents.
                        --------------------------------------------------

          As soon as reasonably practicable after the date hereof, Opfin shall
cause Opgroup or an Opgroup Subsidiary to inform such entity's investment
advisory clients (other than the Opgroup Public Investment Company Clients) of
the transactions contemplated by this Agreement.  Opfin shall cause the Opgroup
Subsidiaries, in compliance with the Advisers Act, to request written consent of
each such client to the assignment to PIMCO Advisors or its Affiliate of its
Advisory Agreement and use commercially reasonable efforts to obtain such
consent, or in the case of agreements which prohibit assignment or state by
their terms that they terminate upon assignment,

                                       40
<PAGE>
 
use commercially reasonable efforts to enter into new agreements with PIMCO
Advisors or its Affiliate effective upon Closing. PIMCO Advisors and TAG each
agrees that, except in the case of such Advisory Agreements which prohibit
assignment or state by their terms that they terminate upon assignment or which,
by their terms, require written consent of the client, Opgroup and the Opgroup
Subsidiaries may obtain consent by requesting written consent and informing such
client: (a) of Opgroup's intention to assign such Advisory Agreement to PIMCO
Advisors; (b) of PIMCO Advisors' intention to continue the advisory services,
pursuant to the existing Advisory Agreement with such client after the Closing
if such client does not terminate such agreement prior to the Closing; and (c)
that the consent of such client will be implied if such client continues to
accept such advisory services for at least 30 days after receipt of such notice
without termination.

          Section 7.4. Insurance.
                       ---------

               (a)  Opfin will use commercially reasonable efforts, and will
     cause Opgroup and the Opgroup Subsidiaries to use commercially reasonable
     efforts, to maintain in effect until the Closing Date all material casualty
     and public liability policies maintained by Opfin, Opgroup and the Opgroup
     Subsidiaries on the date hereof relating to the Opgroup Business, or will
     procure comparable replacement policies (to the extent commercially
     reasonable) and maintain such replacement policies in effect until the
     Closing Date.

               (b)  TAG will cause to be maintained, for a period of not less
     than six years from the Closing Date, policies of directors' and officers,
     general partner and investment advisor insurance covering Opgroup's and the
     Opgroup Subsidiaries' current directors and officers, as well as other
     contractual arrangements, i.e., partnership agreements and indemnification
     agreements, as applicable, to the extent that they provide coverage for
     events occurring prior to and including the Closing (the "D&O Insurance")
     for all present and past directors and officers of Opgroup's and the
     Opgroup Subsidiaries, so long as the annual premium therefor would not be
     in excess of 200% of the last annual premium paid prior to the date of this
     Agreement (the "Maximum Premium").  If the existing D&O Insurance expires,
     is terminated or canceled during such six-year period, TAG will use
     commercially reasonable efforts to cause to be obtained as much D&O
     Insurance as can be obtained for the remainder of such period for an
     annualized premium not in excess of the Maximum Premium, on terms and
     conditions no less advantageous in the aggregate to the insured directors
     and officers than the D&O Insurance as in effect on the date hereof.

          Section 7.5.  Section 15 of the Investment Company Act; TAG and PIMCO
                        -------------------------------------------------------
Advisors Covenants.
- -------------------

          TAG and PIMCO Advisors agree to use their commercially reasonable
efforts to enable the following to be true regarding Section 15(f) of the
Investment Company Act with respect to the Opgroup Public Investment Company
Clients:  (a) for a period of not less than three years after the Closing Date,
no more than 25% of the members of the Board of Directors of any Opgroup Public
Investment Company Client shall be "interested persons" (for purposes of Section
15(f)(1)(A) of the Investment Company Act, as it may be modified by an exemptive
order referred to in Section 7.2(c) of this Agreement) of PIMCO Advisors (or
such other entity which acts as adviser or subadviser to the Opgroup Public
Investment Company Clients), or of the predecessor investment adviser of the
Opgroup Public Investment Company Clients (including "Interested Persons" of
Opfin or its Affiliates) (collectively, the "Relevant Entities"), other than
with respect to any Opgroup Public Investment Company Client not meeting such
requirement as of the Closing; and (b) for a period of not less than two years
after the Closing Date, neither PIMCO Advisors nor any Affiliate

                                       41
<PAGE>
 
of PIMCO Advisors (or any entity which will act as adviser to the Opgroup Public
Investment Company Clients) has or shall have any express or implied
understanding, arrangement or intention to impose an unfair burden on any of the
Opgroup Public Investment Company Clients as a result of the transactions
contemplated herein. For purposes of paragraph (a) of this Section7.5,
"Commercially reasonable efforts" shall mean TAG and PIMCO Advisors (i) causing
to be distributed to the directors of each Opgroup Public Investment Client (A)
on at least an annual basis, a questionnaire containing questions reasonably
designed to elicit information pertaining to the status of such directors as
"interested persons" of the Relevant Entities, and (B) on at least an annual
basis, a legal memorandum describing to the directors the requirements of
Section 15(f) of the Investment Company Act and the relevance of their status
thereunder, (ii) at such time as they learn of a change in the board composition
of an Opgroup Public Investment Company Client or the disinterested status of a
director thereof that would cause more than 25% of the members of such Board of
Directors to be interested persons of Relevant Entities, taking reasonable steps
to correct such situation as promptly as practicable, (iii) obtaining the
agreement of any transferee of all or a portion of the business of TAG and/or
PIMCO Advisors to comply with provisions substantially identical to the
provisions of this Section 7.5 for a period of not less than three years after
the Closing Date and (iv) taking such additional steps (which shall not require
the incurrence of any out-of-pocket expenses by TAG, PIMCO Advisors or their
Affiliates) as Opgroup may from time to time reasonably request in writing in
connection with compliance with Section 15(f) of the Investment Company Act.

          Section 7.6.  Further Assurances.
                        ------------------

          Each party to this Agreement shall execute such documents and other
papers and perform such further acts as may be reasonably required to carry out
the provisions hereof and the transactions contemplated hereby.

          Section 7.7.  Efforts of Parties to Close.
                        ---------------------------

          During the period from the date of this Agreement through the Closing
Date, each party hereto shall use all reasonable efforts to fulfill or obtain
the fulfillment of the conditions precedent to the consummation of the
transactions contemplated hereby, including the execution and delivery of any
documents, certificates, instruments or other papers that are reasonably
required for the consummation of the transactions contemplated hereby.  During
the period from the date of this Agreement and continuing through the Closing,
except as required by Applicable Law or with the prior written consent of the
other parties to this Agreement, no party to this Agreement shall take any
action which, or fail to take any action the failure of which to be taken,
would, or could reasonably be expected to, (a) result in any of the
representations and warranties set forth in this Agreement on the part of the
party taking or failing to take such action being or becoming untrue in any
material respect; (b) result in any conditions to the Closing set forth in
Article VIII not being satisfied; (c) result in a material violation of any
provision of this Agreement; or (d) adversely affect or materially delay the
receipt of any of the requisite regulatory approvals.  The efforts required by
this Section 7.7 shall not be deemed to include any obligation for any party
hereto to make cash payment or other compensation to a third party to obtain
consent to the transactions contemplated by this Agreement.

          Section 7.8.  Announcements.
                        -------------

          Except for such statements and regulatory filings as may be required
by Applicable Law or any Governmental Authority, no party (or any agent or
Affiliate of a party) shall make any public statements, including, without
limitation, any press releases, with respect to this Agreement

                                       42
<PAGE>
 
and the transactions contemplated herein without the prior written consent of
the other party (which consent may not be unreasonably withheld or delayed);
provided, however, the foregoing restrictions should not apply if either party
is required by law or regulation to make an immediate announcement, the non-
announcing party is unavailable for review of the announcement, and such party
remains unavailable after a good faith attempt was made for it to be contacted.

          Section 7.9.  Access, Certain Communications.
                        ------------------------------

               (a) Between the date of this Agreement and the Closing Date,
     subject to any Applicable Laws or other agreements relating to the exchange
     of information, Opfin shall cause Opgroup and the Opgroup Subsidiaries to
     afford to TAG and PIMCO Advisors and their authorized agents and
     representatives complete access, upon reasonable notice and during normal
     business hours, to all contracts, documents and information of or relating
     to the assets, liabilities, business, operations, personnel and other
     aspects of the Opgroup Business; provided, however, that TAG's and PIMCO
     Advisors' investigation shall be conducted in a manner which does not
     unreasonably interfere with the normal operations of the Opgroup Business.
     All such information and access shall be subject to the terms and
     conditions of that certain Confidentiality Agreement between Opgroup and
     PIMCO Advisors, dated August 13, 1996.

               (b) Between the date of this Agreement and the Closing Date,
     subject to any Applicable Laws or other agreements relating to the exchange
     of information, TAG and PIMCO Advisors shall afford to Opfin, Opgroup, the
     Opgroup Subsidiaries and their authorized agents and representatives
     complete access, upon reasonable notice and during normal business hours,
     to all contracts, documents and information of or relating to the assets,
     liabilities, business, operations, personnel and other aspects of TAG and
     PIMCO Advisors and the PIMCO Advisors Subsidiaries; provided, however, that
     Opfin, Opgroup and the Opgroup Subsidiaries' investigation shall be
     conducted in a manner which does not unreasonably interfere with the normal
     operations of the business of TAG, PIMCO Advisors, and the PIMCO Advisors
     Subsidiaries.  All such information and access shall be subject to the
     terms and conditions of that certain Confidentiality Agreement between
     Opgroup and PIMCO Advisors, dated January 10, 1997.

          Section 7.10.  Regulatory Matters; Third Party Consents.
                         ----------------------------------------

               (a)  The parties to this Agreement shall cooperate with each
     other and use all reasonable efforts promptly to prepare and file all
     necessary documentation, to effect all applications, notices, petitions and
     filings, and to obtain as promptly as practicable such permits, consents,
     approvals, waivers and authorizations of all third parties and Governmental
     Authorities which are necessary or advisable to consummate the transactions
     contemplated by this Agreement.

               (b)  Opfin, Opgroup and the Opgroup Subsidiaries will assist
     each of the Opgroup Public Investment Company Clients to prepare and file
     with the SEC as soon as is reasonably practicable after the date hereof a
     preliminary proxy statement, together with a form of proxy, to be used in
     connection with the meeting of the shareholders of each such Opgroup Public
     Investment Company Client and, as promptly as practicable thereafter,
     subject to compliance with the rules and regulations of the SEC, definitive
     proxy statements with respect to such meetings shall be mailed to the
     shareholders of such Opgroup Public

                                       43
<PAGE>
 
     Investment Company Clients. Each such proxy statement shall comply as to
     form in all material respects with all Applicable Law.

               (c)  As promptly as practicable, Opgroup shall prepare and file
     with the IRS a request (the "IRS Ruling Request") for a private letter
     ruling (the "IRS Ruling") substantially to the effect that the Spin-Off
     will not result in taxable income for federal income tax purposes to
     Opgroup or  any of its subsidiaries, Opfin or any of its subsidiaries, Opco
     LP or the other Opgroup Shareholders.   The IRS Ruling Request will,
     without limitation, set forth an accurate description of the actions
     summarized in Annex N.   TAG and PIMCO Advisors shall participate with
     Opgroup in the preparation of the IRS Ruling Request, and shall, and shall
     cause their respective Affiliates to, provide Opgroup with any information,
     cooperation or documentation reasonably requested in connection with the
     application for the IRS Ruling.  PIMCO Advisors shall have the right to
     approve the form and substance of the IRS Ruling Request and any
     supplemental written submissions to the IRS with respect thereto (the "IRS
     Submissions"), which approval shall not unreasonably be withheld; provided,
     however, that PIMCO Advisors shall not be entitled to disapprove of any IRS
     Submission due to the inclusion in such IRS Submission of any factual
     statements or legal positions or arguments that, in the reasonable opinion
     of counsel to Opgroup, must be included in order to obtain an Acceptable
     IRS Ruling.

               (d)  As promptly as practicable, each of  Opfin, Opco LP and TAG
     shall file any reports or notifications that may be required to be filed
     under the HSR Act with the United States Federal Trade Commission and the
     Antitrust Division of the United States Department of Justice and shall
     cooperate with each other in connection with such filings or responses to
     requests for additional information.

               (e)  Each party to this Agreement shall, upon request, furnish
     each other with all information concerning themselves, directors, officers
     and stockholders and such other matters as may be reasonably necessary or
     advisable in connection with any statement, filing, notice or application
     made by or on behalf of TAG, PIMCO Advisors, Opfin, Opco LP or Opgroup or
     any Opgroup Subsidiary to any Governmental Authority in connection with the
     transactions contemplated by this Agreement (except to the extent that such
     information would be, or relates to information that would be, filed under
     a claim of confidentiality).

               (f)  The parties to this Agreement shall promptly advise each
     other upon receiving any communication from any Governmental Authority
     whose consent or approval is required for consummation of the transactions
     contemplated by this Agreement which causes such party to believe that
     there is a reasonable likelihood that any requisite regulatory approval
     will not be obtained or that the receipt of any such approval will be
     materially delayed or that the transactions contemplated hereby will become
     subject to additional conditions imposed by such Governmental Authority.

          Section 7.11.  Notification of Certain Matters.
                         -------------------------------

          Each party to this Agreement shall give prompt notice to the other
party of (a) the occurrence, or failure to occur, of any event or existence of
any condition that has caused or could reasonably be expected to cause any of
its representations or warranties contained in this Agreement to be untrue or
inaccurate in any material respect at any time after the date of this Agreement,
up to and including the Closing Date, and (b) any failure on its part to comply
with or satisfy, in any

                                       44
<PAGE>
 
material respect, any covenant, condition or agreement to be complied with or
satisfied by it under this Agreement. In connection with the Closing, Opfin and
TAG will promptly supplement or amend the various Schedules to this Agreement to
reflect any matter which, if existing, occurring or known at the date of this
Agreement, would have been required to be set forth or described in such
Schedules or which is necessary to correct any information in such Schedules
which was or has been rendered inaccurate thereby.

          Section 7.12.  Expenses.
                         --------

          Expenses of soliciting proxies from shareholders of the Opgroup Public
Investment Companies (including reasonable fees and expenses of legal counsel to
such Investment Companies and legal counsel to their trustees or directors, if
applicable) shall be borne two-thirds by TAG and one-third by Opfin; provided,
however, that any such expenses incurred without the consent of TAG shall be
borne by Opfin.  Until the IRS Ruling is received, the consent of TAG to any
such expenses may be withheld in its sole discretion.  After the IRS Ruling is
received, TAG's consent may not unreasonably be withheld or delayed.  Except as
provided in the preceding sentence, each party shall be solely responsible for
all direct and indirect expenses incurred by it in connection with the
negotiation and preparation of this Agreement and the consummation of the
transactions contemplated hereby.

          Section 7.13.  Transition Agreement.
                         --------------------

          Opfin and PIMCO Advisors shall enter into an agreement substantially
in the form of Annex I (the "Transition Agreement") regarding the ongoing
relationship between the brokerage business operated by Opfin and its Affiliates
and the investment management businesses of PIMCO Advisors and its Affiliates.

          Section 7.14.  Spin-Off.
                         --------

          Opgroup, TAG and PIMCO Advisors shall use commercially reasonable
efforts to obtain an Acceptable IRS Ruling and complete the Spin-Off.

          Section 7.15.  Opfin Actions.
                         -------------
               (a) Prior to the Closing, Opfin shall take such actions as may be
     necessary such that, at and immediately after the Effective Time, (1) only
     the Trustees and Opco LP (through its beneficial interest in the Trust)
     will be the beneficial owner (within the meaning of Section 3(c)(1) of the
     Investment Company Act) of 10% or more of the New TAG Preferred and (2)
     Opco L.P. will not be (i) an "investment company" within the meaning of the
     Investment Company Act or (ii) excepted from such definition of "investment
     company" by reason of Section 3(c)(1) or 3(c)(7) of the Investment Company
     Act.

               (b) Opfin shall take such actions as may be necessary to ensure
     that, so long as TAG is excepted from the definition of "investment
     company" within the meaning of the Investment Company Act pursuant to
     Section 3(c)(1) of the Investment Company Act by virtue of having 45 or
     fewer "beneficial owners" of its outstanding securities immediately prior
     to the Effective Time, the Merger and the transactions contemplated thereby
     shall not cause TAG to lose such exception by virtue of having immediately
     after the Effective Time

                                       45
<PAGE>
 
     more than 100 "beneficial owners" of TAG securities within the meaning of
     Section 3(c)(1) of the Investment Company Act.

          Section 7.16.  Closing Date Balance Sheets.
                         ---------------------------

          Promptly following the Closing Date, TAG will cause to be prepared in
accordance with GAAP balance sheets for each of Opgroup, Advantage Advisers and
TAG setting forth the financial position of each such corporation as of the
close of business on the date immediately preceding the Closing Date after
giving effect to the Spin-Off  and the elimination of all liabilities for which
indemnification is available under Section 10.2(c), and without giving effect to
the Merger (collectively, the "Closing Date Balance Sheets"), and shall deliver
the same to Opfin.  Opfin and a firm of independent public accountants
designated by Opfin ("Opfin's Accountants") will be entitled to reasonable
access during normal business hours to the relevant books, records and working
papers of TAG, Opgroup and Advantage Advisers, and TAG's Accountants, if
applicable, to aid in their review of the Closing Date Balance Sheets.  The
Closing Date Balance Sheets shall be deemed to be accepted by Opfin and shall be
conclusive for all purposes of  this Agreement except to the extent, if any,
that Opfin or Opfin's Accountants shall have delivered, within sixty days after
the date on which the Closing Date Balance Sheets are delivered to Opfin, a
written notice to TAG stating each and every item as to which Opfin takes
exception ("Objections"), specifying in detail the nature and extent of any such
Objection.  If an Objection is disputed by TAG, then Opfin and TAG shall
negotiate in good faith to resolve such dispute.  If, after a period of thirty
days following the date on which Opfin gave notice of the Objection, any
Objection still remains disputed, then TAG's accountants and Opfin's Accountants
shall together choose an independent firm of public accountants of nationally
recognized standing (the "Accounting Firm") to resolve such remaining
Objections.  The Accounting Firm shall act as an arbitrator and shall only have
the power and authority to determine, based solely on presentations by TAG and
Opfin, and not by independent review, only those issues still in dispute.  The
decision of the Accounting Firm shall be final and binding. The fees and
expenses of the Accounting Firm, if any, shall be paid equally by TAG and Opfin;
provided, however, that, if the Accounting Firm determines that either party's
position is totally correct, then the other party shall pay the fees charged by
the Accounting Firm in connection with any such determination.

          Section 7.17.  Brokers.
                         -------

          Opfin shall pay, or cause to be paid, any broker's, finder's or
similar fee or other commission owed by Opgroup or any Opgroup Subsidiary in
connection with this Agreement or the Merger, including but not limited to that
owed to Goldman, Sachs & Co.

          Section 7.18.  Advantage Advisers and Opgroup at Closing.
                         -----------------------------------------

          At the Closing Date, Opfin shall cause Opgroup (on a stand-alone
basis) to have no liabilities and obligations (whether known or unknown, direct
or indirect and including, without limitation, accrued and contingent
liabilities) other than (A) the  liabilities under the Opgroup Equities Note,
(B) liabilities which are fully funded at the Closing Date and (C) liabilities
for which indemnification is available under Section 10.2(c), and shall cause
Advantage Advisers (on a stand-alone basis) to have no liabilities and
obligations (whether known or unknown, direct or indirect and including, without
limitation, accrued and contingent liabilities) other than (X) liabilities and
obligations incurred in connection with the Advantage Advisers Business and
liabilities and obligations incurred  in connection with the Opgroup Business
and assumed from Opfin pursuant to the Assumption and Assignment Agreement
(other than any such liabilities and obligations arising

                                       46
<PAGE>
 
from, in connection with or constituting any breach of any representation or
warranty in Article IV or any covenant of Opfin or Opgroup herein), (Y)
liabilities which are fully funded at the Closing Date and (Z) liabilities for
which indemnification is available under Section 10.2(c). Opfin shall further
cause Advantage Advisers at the Closing Date to have positive net current assets
and positive net assets, without attribution of any value to the management
contracts for the Advantage Advisers Funds and the general partner interests in
Opcap and Opcap LP.

          Section 7.19.  Spin-Off.
                         --------

          Opfin and Opgroup shall cause the distribution to the Opgroup
Shareholders of the stock of Opfin owned by Opgroup to be effected on the
Closing Date.

          Section 7.20.  Certain Pre-Closing Matters.
                         ---------------------------

          (a) PIMCO Advisors shall use its reasonable best efforts to obtain
irrevocable commitments from the holders of TAG's Common Stock, with respect to
not less than 1,691 shares of such Common Stock, that if it is necessary (as
determined pursuant to Section 7.20(b)), in order to satisfy the conditions set
forth in Section 8.1(m) or Section 8.2(d), to alter the form of the transactions
contemplated in this Agreement such that TAG will merge with and into Opgroup at
the Closing, such  holders, should they be requested, will agree not to sell,
assign or otherwise transfer such shares for a period of not less than 24 months
after the Closing Date; provided that such commitments may provide that such
holders may pledge some or all of such shares to the lenders of PIMCO Partners
and that any foreclosure by such lenders upon such shares shall not be
considered a sale, transfer or other disposition for purposes of such
commitments.  PIMCO Advisors shall notify Opfin in writing promptly upon
obtaining such commitments.  Nothing in this Section 7.20(a) shall be deemed to
impose upon any such holder of Common Stock any obligation to give such
commitment, which may be withheld in each holder's absolute discretion.

          (b) PIMCO Advisors and TAG agree, contingent upon obtaining the
commitments described in 7.20(a), and Opfin and Opgroup agree, that if, either
party reasonably determines that, in order to satisfy the conditions set forth
in Section 8.1(m) or Section 8.2(d) hereof, it is necessary to alter the form of
the transactions contemplated by this Agreement such that TAG will merge with
and into Opgroup at the Closing, to amend the Transaction Documents as may be
necessary to conform the terms of such documents to reflect the merger of TAG
with and into Opgroup.

                                 ARTICLE VIII.


                             CONDITIONS TO CLOSING
                             ---------------------

          Section 8.1.  Conditions to TAG's Obligations.
                        -------------------------------

          The obligations of TAG to effect the Closing shall be subject to the
following conditions, any of which may be waived in writing by TAG:

               (a)  The representations and warranties of Opfin contained in
     this Agreement shall be true and correct when made and at and as of the
     Closing Date, with the same effect as though made on and as of the Closing
     Date (except for representations and warranties made as of a specific date,
     which shall be true and correct as of such date), except

                                       47
<PAGE>
 
     for changes or inaccuracies therein that do not individually or in the
     aggregate reflect an Opgroup Material Adverse Effect;

               (b)  Opgroup and Opfin shall have performed and complied in all
     material respects with all agreements, covenants, obligations and
     conditions required by this Agreement to be performed or complied with by
     them at or prior to the Closing Date;

               (c)  Opfin and Opgroup shall have executed the Tax Indemnity
     Agreement;

               (d)  Opgroup shall have delivered to TAG two certificates, dated
     the Closing Date, one signed on behalf of Opfin by an executive officer as
     to matters contained in paragraphs (a) and (b) of this Section 8.1 and the
     other signed on behalf of Opgroup by an executive officer of Opgroup as to
     matters contained in paragraph (b) of this Section 8.1;

               (e)  Each Opgroup Shareholder shall have executed and delivered
     to TAG a certificate substantially in the form attached as Annex B;

               (f) TAG and PIMCO Advisors shall have received the opinion of
     counsel to Opfin and Opgroup, dated the Closing Date, substantially in the
     form attached hereto as Exhibit 8.1(f);

               (g) Each of the approvals set forth in Section 7.2(a) shall have
     been obtained, all of the conditions described in Section 7.2(b) shall have
     been satisfied and consents from clients representing at least 92.5% of the
     Run Rate Revenues generated by all clients (on an annualized basis as of
     the date hereof) shall have been obtained;

               (h) The representations and warranties set forth in Section 4.18
     shall be true and correct in all respects;

               (i) A license agreement substantially in the form attached hereto
     as Annex C (the "License Agreement") shall have been executed and delivered
     by the parties thereto;

               (j) Opco LP shall have executed and delivered the Transition
     Agreement;

               (k) The Trustees, on behalf of the Opgroup Shareholders, shall
     have executed and delivered an irrevocable proxy to vote the shares of New
     TAG Preferred in favor of the matters described on Annex H in the form of
     Annex L;

               (l) Since October 31, 1996, no event shall have occurred which
     shall have had or could reasonably be expected to have, individually or in
     the aggregate with any other event occurring after such date, an Opgroup
     Material Adverse Effect;

               (m) Opgroup shall have received the Acceptable IRS Ruling;

               (n) Each of Alan H. Rappaport, Mark C. Biderman and Robert I.
     Kleinberg shall have resigned from the board of directors of each
     Advantage Adviser Fund of which he is a member, and one replacement on each
     such board selected by PIMCO Advisors shall have been elected to the board,
     such replacement selected by PIMCO

                                       48
<PAGE>
 
     Advisors to have the longest available term if the Identified Fund has a
     staggered board of directors, with Joseph M. La Motta to serve initially as
     PIMCO Advisors' nominee for the boards of directors on which he already
     serves as a director;

               (o) The Board of Directors of each Identified Fund shall have
     unanimously approved, and a majority of the outstanding voting securities
     (as defined in the Investment Company Act) of each Identified Fund shall
     have approved, an investment advisory agreement to come into effect at the
     Effective Time with the Affiliate of Opcap that is an investment advisor to
     such fund, each such agreement to be substantially in the form of the
     current agreement between the Identified Fund and a current Opcap Affiliate
     and, in the case of the Advantage Advisers Funds, to have an initial term
     of two years;

               (p) The Board of Directors of each SBAM Fund shall have elected
     that person designated by TAG to hold such titles as are currently held by
     any persons affiliated with Oppenheimer & Co., Inc. and also shall have
     appointed one additional designee of TAG to the office of Vice President of
     each such fund; and the Board of Directors of each other Identified Fund
     shall have elected those persons designated by TAG to hold such titles as
     officers of the Identified Fund as may be determined by TAG;

               (q) The board of directors of The Czech Republic Fund, Inc. shall
     have unanimously approved an administration agreement with Opcap which is
     substantially in the form of the current agreement between such fund and
     Oppenheimer & Co., Inc.;

               (r) Joseph M. La Motta shall have executed an agreement with
     PIMCO Advisors agreeing to resign from the Board of Directors of each
     Identified Fund as may be requested by TAG in its sole discretion except
     that such request must be joined by Oppenheimer & Co., Inc. in the case of
     OCC Cash Reserves, Inc.;

               (s) TAG and PIMCO Advisors shall have received an opinion of
     Latham & Watkins, counsel to TAG and PIMCO Advisors , to the effect that
     the Merger qualifies as a tax-free reorganization pursuant to Section
     368(a) of the Code; which opinion may rely on the rulings set forth in the
     Acceptable IRS Ruling pertaining to the satisfaction of the continuity of
     business enterprise doctrine and on customary representations from TAG,
     PIMCO Advisors, Opgroup and Opfin;

               (t) TAG and PIMCO Advisors shall have received an opinion of
     Ropes & Gray, special Investment Company Act counsel for TAG and PIMCO, in
     form and substance reasonably satisfactory to PIMCO and TAG, to the effect
     that the transactions contemplated by this Agreement shall not cause TAG to
     be required to register as an investment company pursuant to the Investment
     Company Act, which opinion may rely on an assumption that TAG has less than
     45 beneficial owners (within the meaning of Section 3(c)(1) of the
     Investment Company Act) immediately prior to the Merger and shall also rely
     on representations by those entities identified in Schedule 4.5(a)
     (including the notes thereto);

               (u) A trust (the "New TAG Trust") shall have been formed, with
     Nathan Gantcher and Stephen Robert as trustees, the declaration of trust of
     the New TAG Trust shall have been approved by PIMCO Advisors (which
     approval shall not be unreasonably withheld), and the New TAG Trust shall
     be authorized to receive and hold of record all of the New TAG Preferred to
     be issued in the Merger;

                                       49
<PAGE>
 
               (v) A trust (the "Opfin Trust") shall have been formed, with
     Nathan Gantcher and Stephen Robert as trustees, the declaration of trust of
     the Opfin Trust shall have been approved by PIMCO Advisors (which approval
     shall not be unreasonably withheld), and the Opfin Trust shall receive and
     hold of record all of the outstanding capital stock of Opfin; and

               (w) The trustees, in their capacity as trustees of the New TAG
     Trust and the Opfin Trust, shall have entered into an agreement with TAG
     and PIMCO Advisors containing the covenants set forth on Annex O and Annex
     P hereto, respectively, (the "Trust Covenants").

          Section 8.2.  Conditions to Opfin's and Opgroup's Obligations.
                        -----------------------------------------------

          The obligation of Opfin and Opgroup to effect the Closing shall be
subject to the following conditions, which may be waived in writing by Opfin:

               (a)  The representations and warranties of TAG and PIMCO
     Advisors contained in this Agreement shall be true and correct when made
     and at and as of the Closing Date, with the same effect as though made on
     and as of the Closing Date (except for representations and warranties made
     as of a specific date, which shall be true and correct as of such date),
     except for changes or inaccuracies therein that do not individually or in
     the aggregate reflect a TAG Material Adverse Effect;

               (b)  PIMCO Advisors and TAG shall each have performed and
     complied in all material respects with all agreements, covenants,
     obligations and conditions required by this Agreement to be performed or
     complied with by it at or prior to the Closing Date;

               (c)  PIMCO Advisors and TAG shall each have delivered to Opfin a
     separate certificate, dated the Closing Date, signed on behalf of by its
     Chief Executive Officer and Chief Financial Officer confirming the
     satisfaction of the conditions contained in paragraphs (a) and (b) of this
     Section 8.2 insofar as such conditions pertain to it;

               (d)  Opgroup shall have received the Acceptable IRS Ruling;

               (e)  Opgroup shall have received the opinion of counsel to TAG
     and PIMCO Advisors, dated the Closing Date, substantially in the form
     attached hereto as Exhibit 8.2(e);

               (f) No more than 25% of the members of the Board of Directors of
     any Opgroup Public Investment Company Client (other than those listed on
     Schedule 1.1(b)) shall be "interested persons" (as defined in the
     Investment Company Act) of PIMCO Advisors (or such other Affiliate of TAG
     which will act as adviser or subadviser to such Opgroup Public Investment
     Company Client immediately following the Closing) or of Opgroup or its
     Affiliates for purposes of Section 15(f)(1)(A) of the Investment Company
     Act (as it may be modified by any exemptive order referred to in Section
     7.2(b) of this Agreement);

               (g) Since September 30, 1996, no event shall have occurred which
     had or could reasonably be expected to have, individually or in the
     aggregate with any other event occurring after such date, a TAG Material
     Adverse Effect;

                                       50
<PAGE>
 
               (h) TAG shall have filed with the Delaware Secretary of State the
     amended and restated certificate of incorporation of TAG, in the form of
     Annex D;

               (i) PIMCO Advisors and TAG shall have entered into a contribution
     agreement substantially in the form of Annex E (the "TAG Contribution
     Agreement"), and pursuant thereto, PIMCO Advisors shall, concurrently with
     the contribution to PIMCO Advisors by Advantage Advisers of the general
     partner interest in Opcap, have issued the number of  Class A Units to
     Advantage Advisers specified therein (the "New TAG Preferred Underlying
     Units");

               (j) TAG and PIMCO Advisors shall have executed and delivered a
     registration rights agreement (the "Registration Rights Agreement") in the
     form of Annex F;

               (k) PIMCO Advisors shall have executed and delivered a keepwell
     agreement (the "Keepwell Agreement") in the form of Annex G;

               (l) TAG and PIMCO Advisors shall have executed and delivered the
     Tax Indemnity Agreement;

               (m) PIMCO Advisors shall have executed the PIMCO Advisors
     Purchase Agreement; and

               (n) Opgroup shall have received an opinion of Weil, Gotshal &
     Manges LLP, counsel to Opfin, to the effect that the Merger qualifies as a
     tax-free reorganization pursuant to Section 368(a) of the Code; which
     opinion may rely on the rulings set forth in the Acceptable IRS Ruling
     pertaining to the satisfaction of the continuity of business enterprise
     doctrine and on customary representations from TAG, PIMCO Advisors, Opgroup
     and Opfin.

          Section 8.3.  Mutual Conditions.
                        -----------------

          The obligations of each party to this Agreement to effect the Closing
shall be subject to the following conditions, any of which may be waived in
writing by both Opfin and TAG:

               (a)  the Spin-Off shall have occurred;

               (b)  no order, injunction or decree issued by any court or
     agency of competent jurisdiction or other legal restraint or prohibition
     preventing the consummation of the transactions contemplated by this
     Agreement shall be in effect.  No proceeding initiated by any Governmental
     Authority seeking an injunction shall be pending.  No statute, rule,
     regulation, order, injunction or decree shall have been enacted, entered,
     promulgated or enforced by any Governmental Authority which prohibits,
     restricts or makes illegal consummation of the transactions contemplated
     hereby;

               (c)  all regulatory approvals required to consummate the
     transactions contemplated hereby shall have been obtained and shall remain
     in full force and effect and all statutory waiting periods in respect
     thereof shall have expired;

               (d)  in respect of the notifications of the parties hereto
     pursuant to the HSR Act, the applicable waiting period and any extensions
     thereof shall have expired or terminated;

                                       51
<PAGE>
 
               (e) Opfin shall have obtained  all necessary consents of the
     parties to the Warrant Agreement to the Merger and the transactions
     contemplated hereby;

               (f) Oppenheimer & Co., Inc. and Oppenheimer Holdings, Inc. shall
     have obtained the consent of their lenders to the Merger and the
     transactions contemplated thereby;

               (g) PIMCO Partners shall have obtained all necessary consents of
     the lenders to PIMCO Partners to the Merger and the transactions
     contemplated hereby;

               (h) Opco LP shall have (i) given its written consent to the
     Merger and the transactions contemplated thereby and (ii) obtained the
     requisite approval of its partners to certain amendments to its partnership
     agreement;

               (i) the Board of Directors or trustees, as applicable, and
     shareholders of each Opgroup Public Investment Company Client shall have
     approved a new Advisory Agreement with PIMCO Advisors or its Affiliate, or
     the assignment of its Advisory Agreement, as applicable, pursuant to the
     provisions of Section 7.2(a); and

               (j) The stockholders of TAG shall have given their written
     consent to the Merger and the transactions contemplated hereby.

                                   ARTICLE IX.


                        ACTIONS SUBSEQUENT TO THE MERGER

          Section 9.1.  Formation of New PIMCO Advisors Investment Management
                        -----------------------------------------------------
Subsidiary.
- ----------

          In connection with the Closing, TAG will, pursuant to the TAG
Contribution Agreement, cause Advantage Advisers to contribute its general
partner interest in Opcap to a newly formed partnership or limited liability
company wholly-owned by PIMCO Advisors ("Value Advisors").

          Section 9.2.  PIMCO Advisors Restructuring.
                        ----------------------------

          On or about November 30, 1997, PIMCO Advisors and TAG shall take the
actions to effect the restructuring described in Annex H, subject to such
changes or alterations thereto which do not adversely affect the holders of the
New TAG Preferred (the "Restructuring").  Until completion of the Restructuring,
TAG and PIMCO Advisors will submit, to Opfin (i) quarterly reports concerning
the current status of the timing and form of the Restructuring and (ii) (a) not
later than 45 days after the end of each fiscal quarter of TAG and of PIMCO
Advisors, the financial statements of TAG and of PIMCO Advisors; and (b) not
later than 90 days after the end of each fiscal year of TAG and of PIMCO
Advisors, the financial statements of TAG and of PIMCO Advisors (which shall be
audited and in accordance with GAAP).  TAG and PIMCO Advisors will promptly
notify Opfin, in writing, of any events or changes material to the
Restructuring; provided, however, that no such notification shall relieve PIMCO
Advisors and TAG from their respective obligations to effect the Restructuring.

                                       52
<PAGE>
 
          Section 9.3.  Additional Fund Related Covenants.
                        ---------------------------------

          Opfin shall cause Alan H. Rappaport and Mark C. Biderman for a period
of one year from the Closing Date, at Advantage Advisers' request and at a
reasonable fee rate to be designated by Advantage Advisers, to act as
consultants to Advantage Advisers with respect to the Advantage Advisers Funds
and/or attend Board meetings of the Advantage Advisers Funds.

          Section 9.4.  Continuing Covenants.
                        --------------------

               (a) Subject to Section 9.4(b), for a period of thirty (30) months
     from the Closing Date:

                    (i)   Limitations on Dividends, Distributions and Affiliate
                          -----------------------------------------------------
          Transactions.  Opfin shall not (A) declare or make any dividend or
          ------------
          other distribution on any shares of any class of its capital stock,
          except in shares of its capital stock; (B) purchase, redeem, retire or
          otherwise acquire for value any shares of any class of its capital
          stock or any warrants, rights or options to acquire any such shares;
          or (C) enter into, or permit a Subsidiary of Opfin to enter into, any
          transaction with any Affiliate of Opfin other than a Subsidiary of
          Opfin which is not on an arms' length basis if, after giving effect to
          any such action described in clause (A), (B) or (C), the Consolidated
          Net Worth of Opfin would be less than $220 million.

                    (ii)  Debt Ratio.  Opfin shall maintain a ratio of Opfin
                          ----------
          Indebtedness to Opfin Consolidated Net Worth of not more than 1:1.

                    (iii) Financial Statements.  Opfin shall deliver to TAG:
                          --------------------
          (A) not later than 45 days after the end of each fiscal quarter of
          Opfin, the consolidated financial statements of Opfin and its
          Subsidiaries; and (B) not later than 90 days after the end of each
          fiscal year of Opfin, the consolidated financial statements of Opfin
          and its Subsidiaries.

               (b) The period during which the covenants set forth in Section
     9.4(a) are effective shall be extended under the circumstances described
     below:

                    (i) TAG shall have the right, for a period of 25 days
          beginning on the first day of the 30th month following the Closing
          Date (such period, the "TAG Diligence Period") to perform reasonable
          diligence with respect to Opfin, the New TAG Trust and the Opfin Trust
          to the extent reasonably necessary to determine whether any breach of
          a Trust Covenant or any breach by Opfin, any of its Subsidiaries or
          any of the shareholders of Opfin of any of the representations or
          statements made to the IRS in connection with the IRS Ruling Request
          or contained in the Acceptable IRS Ruling has occurred.  Opfin, the
          New TAG Trust and the Opfin Trust shall, and shall cause their
          Subsidiaries to, provide TAG with documents as reasonably may be
          requested by TAG in connection with the examination and diligence
          described in the preceding sentence, and TAG shall pay any reasonable
          out-of-pocket expenses incurred by Opfin and its Subsidiaries in
          connection therewith.

                    (ii) In the event TAG reasonably determines during the TAG
          Diligence Period that there has been a breach of a Trust Covenant or a
          breach by

                                       53
<PAGE>
 
          Opfin, any of its Subsidiaries or any of the shareholders of
          Opfin of any of the representations or statements made to the IRS in
          connection with the IRS Ruling Request or contained in the Acceptable
          IRS Ruling, then TAG shall provide Opfin, before the last day of the
          TAG Diligence Period, with written notice of such determination (the
          "Determination Notice") which shall specify, in reasonable detail, its
          basis for such determination and shall be accompanied by a written
          opinion of Latham & Watkins (or other nationally recognized law firm
          reasonably acceptable to TAG) to the effect that there exists a
          reasonable basis to conclude that the breach described in the
          Determination Notice would be held by a court of law to have caused
          (i) the Spin-Off to fail to qualify as a tax-free distribution under
          Section 355 of the Code or (ii) the Merger to fail to qualify as a
          tax-free reorganization under Section 368 of the Code.

                    (iii)  In the event that TAG delivers a Determination Notice
          to Opfin accompanied by an opinion of counsel as described in Section
          9.4(b)(ii), then the covenants set forth in Section 9.4(a) shall
          remain in effect until any Tax Liability arising from the breach
          described in the Determination Notice is finally determined and Opfin
          satisfies its indemnity obligation, if any, to any member of the TAG
          Post-Merger Group with respect to such Tax Liability.

               (c) In the event that (i) Opfin proposes to seek a supplemental
     IRS Ruling or (ii) Opfin or the trustees of the New TAG Trust or the Opfin
     Trust proposes to undertake a transaction that would violate the Trust
     Covenants absent the receipt of a supplemental IRS Ruling, Opfin shall have
     the right, upon ten (10) Business Days' prior written notice, for a period
     of twenty-five (25) days to perform reasonable diligence during regular
     business hours with respect to TAG, Advantage Advisers and PIMCO Advisors,
     and their Affiliates, to the extent reasonably  necessary to determine
     whether any breach of the representations or statements by or with respect
     to TAG, Advantage Advisers and PIMCO Advisors, and their Affiliates, made
     to the IRS in connection with the IRS Ruling Request or contained in the
     Acceptable IRS Ruling has occurred.  TAG and PIMCO Advisors shall, and
     shall cause their Affiliates to, provide Opfin with documents as reasonably
     may be requested by Opfin in connection with the diligence described in the
     previous sentence, and Opfin shall pay any reasonable out-of-pocket
     expenses incurred by TAG, PIMCO Advisors and their Affiliates in connection
     therewith.

          Section 9.5.  Supplemental IRS Rulings.
                        ------------------------

          Each of Opfin, TAG, PIMCO Advisors and Advantage Advisers shall, and
shall cause their respective Affiliates to, provide the other with any
information, cooperation, or documentation reasonably required in connection
with the application by any such party or its Affiliate for a private letter
ruling from the IRS to the effect that a proposed action by such party or its
Affiliates would not cause all or any part of the Spin-Off to fail to qualify as
a tax-free distribution within the meaning of Section 355 of the Code or the
Merger to fail to qualify as a tax-free reorganization within the meaning of
Section 368 of the Code.

                                       54
<PAGE>
 
                                  ARTICLE X.


                                INDEMNIFICATION
                                ---------------

          Section 10.1.  Indemnification by PIMCO Advisors and TAG.
                         -----------------------------------------

          Subject to the limitations and conditions set forth in this Article X,
PIMCO Advisors and TAG shall, jointly and severally, indemnify and hold
harmless, to the fullest extent permitted by law, the Opgroup Shareholders and
each of their respective officers, directors, employees, agents and Affiliates
(collectively, the "Opgroup Indemnitees") from and against any and all Losses
which they or any of them may suffer or incur, to the extent arising from:

               (a)  any breach or default in performance by TAG or PIMCO
     Advisors of any covenant or agreement of TAG or PIMCO Advisors contained in
     this Agreement; or

               (b)  any breach of any representation or warranty made by TAG or
     PIMCO Advisors in this Agreement or in any certificate or instrument
     delivered by or on behalf of TAG or PIMCO Advisors pursuant hereto.

          Indemnification under this Section 10.1 shall be available regardless
of any investigation made at any time before or after the Closing Date by or on
behalf of Opfin or any of its Affiliates or of any information any such party
may have in respect thereof; provided, however, that no such indemnification
under paragraph (b) above shall be available for a breach of a particular
representation or warranty if written notice has been given to Opfin prior to
the Closing Date, specifying in reasonable detail the information or
circumstances making such representation or warranty untrue, and such state of
affairs, taking into account all matters which have occurred, would give Opfin
or Opgroup the right not to effect the Closing, and Opfin or Opgroup elects to
waive the same and effect the Closing.

          Section 10.2.  Indemnification by Opfin.
                         ------------------------

          Subject to the limitations and conditions set forth in this Article X,
Opfin shall indemnify and hold harmless, to the fullest extent permitted by law,
TAG and PIMCO Advisors and each of their officers, directors, limited liability
company members and managers, employees, agents and Affiliates (collectively,
the "PIMCO Indemnitees") from and against any and all Losses which they or any
of them may suffer or incur, to the extent arising from:

               (a)  any breach or default in performance of any covenant or
     agreement of or regarding Opfin, Opgroup or any Opgroup Subsidiary
     contained in this Agreement; or

               (b)  any breach of any representation or warranty made by Opfin
     in this Agreement or by any Opfin, Opgroup or any Opgroup Shareholder in
     any certificate or instrument delivered to TAG or PIMCO Advisors in
     connection with this Agreement or the Merger; or

               (c) (i) any liabilities and obligations (whether known or
     unknown, direct or indirect and including, without limitation, accrued and
     contingent liabilities) of Opgroup (on a stand-alone basis) other than (A)
     the  liabilities under the Opgroup Equities Note and (B) other liabilities
     which are fully funded at the Closing Date and (ii) any liabilities and
     obligations (whether known or unknown, direct or indirect and including,
     without limitation,

                                       55
<PAGE>
 
     accrued and contingent liabilities) of Advantage Advisers (on a stand-alone
     basis) other than (X) liabilities and obligations incurred in connection
     with the Advantage Advisers Business, liabilities and obligations incurred
     in connection with acting as sole general partner of Opcap LP and managing
     general partner of Opcap after the Closing and liabilities and obligations
     incurred in connection with the Opgroup Business assumed from Opfin
     pursuant to the Assumption and Assignment Agreement (other than any such
     liabilities and obligations arising from, in connection with or
     constituting any breach of any representation or warranty in Article IV or
     any covenant of Opfin or Opgroup herein) and (Y) other liabilities which
     are fully funded at the Closing Date, in each case other than liabilities
     for Taxes, which are the subject of the Tax Indemnity Agreement.

          Indemnification under this Section 10.2 shall be available regardless
of any investigation made at any time before or after the Closing Date by or on
behalf of either TAG or PIMCO Advisors or of any of their Affiliates or of any
information any such party may have in respect thereof; provided, however, that
no such indemnification under paragraph (b) above shall be available for a
breach of a particular representation or warranty if notice has been given to
PIMCO Advisors prior to the Closing Date, specifying in reasonable detail the
information or circumstances making such representation or warranty untrue, and
such state of affairs, taking into account all matters which have occurred,
would give PIMCO Advisors and TAG the right not to effect the Closing, and PIMCO
Advisors elects to waive the same and effect the Closing.

          Section 10.3.  Monetary Limitation.
                         -------------------

               (a)  Neither Opfin, on the one hand, nor TAG or PIMCO Advisors,
     on the other hand, shall have any obligation to indemnify any Opgroup
     Indemnitee or PIMCO Indemnitee, respectively, pursuant to Section 10.1(b)
     or 10.2(b), respectively, unless and until the aggregate of all Losses
     suffered or incurred by all PIMCO Indemnitees or Opgroup Indemnitees, as
     applicable, which would otherwise be subject to indemnification hereunder
     exceeds $2,000,000, and then only for the excess over $2,000,000.   The
     aggregate amount of Losses that may be recovered by the Opgroup Indemnitees
     under Section 10.1(b), or by the PIMCO Indemnitees under Section 10.2(b),
     shall not exceed 50% of the issue price of the shares of New TAG Preferred
     issued in the Merger.  The limitations under this Section 10.3(a) shall not
     apply with respect to any obligation to indemnify a PIMCO Indemnitee under
     Sections 10.2(a) or 10.2(c) or which could be construed to arise under both
     Sections 10.2(a) and 10.2(b) or both Sections 10.2(c) and 10.2(b) or an
     Opgroup Indemnitee under Section 10.1(a) which could be construed to arise
     under both Sections 10.1(a) and 10.1(b).

               (b)  Whenever any breach, default, or other event which triggers
     a party's indemnification obligations under Section 10.1(b) or 10.2(b)
     contains a materiality standard, the dollar amount of the Loss which causes
     such breach, default, or other event to meet or exceed such materiality
     standard shall be counted from dollar one in determining whether or not the
     $2,000,000 threshold set forth in Section 10.3(a) has been met.  For
     example, if the materiality standard for a breach were $400,000 and the
     Losses from a breach were $500,000, the total Losses of $500,000 would be
     counted against the $2,000,000 threshold.

          Section 10.4.  Nature and Survival; Time Limits.
                         --------------------------------

               (a)  All representations and warranties made herein or pursuant
     hereto or in connection with the transactions contemplated hereby shall
     survive the Closing and continue in effect until the end of the 12th month
     following the month in which the Closing

                                       56
<PAGE>
 
     Date occurs unless specifically provided otherwise herein (unless the
     conditions set forth in 10.1 and 10.2 regarding notice and waiver are
     satisfied); provided however, the representations and warranties set forth
     in Sections 4.15, 5.13 and 6.16 shall survive until the end of the
     applicable statute of limitations; and provided, further, that any such
     time limit shall not apply to bar any claim based on a party's fraud or
     intentional misrepresentation.

               (b)  The covenants and agreements of the parties set forth in
     this Agreement shall survive indefinitely until performed; provided,
     however, that, subject to Section 10.4(a), any claim against any party
     hereto for indemnification pursuant to this Article X as a result of any
     breach of representation or warranty made by such party must be brought
     within the period of time during which such representation or warranty
     survives the Closing pursuant to Section 10.4(a); and, provided further,
     that any claim for indemnification brought pursuant to Section 10.2(c) must
     be made within 36 months following the month in which the Closing Date
     occurs.

          Section 10.5.  Limitation on Remedies.
                         ----------------------

               (a)  The remedies provided in this Article X, subject to the
     limitations set forth in this Agreement, shall be the exclusive remedies
     available to a party to this Agreement for any breach or violation of this
     Agreement by another party hereto; provided, however, that the foregoing
     shall not limit or deny any claim based upon a party's fraud or intentional
     misrepresentation; and provided further, that the parties recognize that
     any remedy at law for a breach of the covenants set forth in Section 9.4(a)
     is inadequate and that TAG and PIMCO Advisors shall be entitled, in
     addition to such other remedies as they may have under this Article X at
     law or equity, to a temporary restraining order and preliminary and
     permanent injunctive relief to enjoin any breach or threatened breach of
     the covenants set forth in Section 9.4(a) without proof of any actual
     damages that have been or may have been caused to them by such breach.

               (b)  No Indemnified Party shall seek or be entitled to, or
     accept payment of any award or judgment for, punitive damages from an
     Indemnifying Party.

          Section 10.6.  General Provisions.
                         ------------------

          In the case of any claim for indemnification brought pursuant to this
Article X (other than with respect to Taxes, the procedures for which are the
subject of the Tax Indemnity Agreement):

               (a)  The party entitled to indemnification (the "Indemnified
     Party") shall promptly notify the party obligated to provide
     indemnification (the "Indemnifying Party") of any claim for which
     indemnification is sought pursuant to this Article X ("Indemnified Claim"),
     in writing and in reasonable detail and accompanied by reasonable
     supporting documentation, and within any applicable time limits specified
     in this Agreement; provided, however, that the failure of an Indemnified
     Party to give such notice shall not affect such Indemnified Party's rights
     to indemnification under this Article X, except and only to the extent that
     the Indemnifying Party actually incurred an incremental out of pocket
     expense (in which case recovery shall be reduced by such expense) or was
     materially prejudiced by such failure.

                                       57
<PAGE>
 
               (b)  The Indemnified Party shall use all reasonable efforts to
     mitigate any Losses.

               (c)  The Indemnifying Party will be entitled to participate in
     the prosecution or defense of an Indemnified Claim and, at its option,
     jointly with any other Indemnifying Party which so elects, elect to assume
     control of such Indemnified Claim, including without limitation the filing
     and prosecution, or defense, of any action in connection with such
     Indemnified Claim.  Subsequent to such assumption of control, (i) the
     Indemnifying Party shall not be liable to the Indemnified Party for any
     legal or other expenses subsequently incurred by the Indemnified Party in
     connection with such Indemnified Claim; and (ii) the Indemnifying Party
     shall control such Indemnified Claim; provided, however, that the
     Indemnified Party shall have the right to participate in the prosecution or
     defense of such Indemnified Claim and to be represented, solely at its
     expense, by counsel selected by it.

               (d)   The Indemnified Party will, at the expense of the
     Indemnifying Party, cooperate with the Indemnifying Party in the
     investigation, preparation, prosecution or defense of an Indemnified Claim
     and shall furnish any documents and endeavor to make available any
     employees under its control.

               (e)   The Indemnified Party shall not admit any liability with
     respect to, or settle, compromise or discharge, any Indemnified Claim
     without the prior written consent of the Indemnifying Party, which consent
     shall not be unreasonably withheld or delayed; provided, however, that if
     the defense of any proceeding in respect of an Indemnified Claim has been
     assumed by an Indemnifying Party, the Indemnified Party shall consent to
     any settlement, compromise or discharge of such Indemnified Claim which the
     Indemnifying Party may recommend, so long as such settlement, compromise or
     discharge by its terms obligates the Indemnifying Party to pay all of the
     Losses of such Indemnified Party arising from such Indemnified Claim,
     releases such Indemnified Party from any and all liabilities and
     obligations it may have in connection with such Indemnified Claim, and does
     not otherwise adversely affect such Indemnified Party.

               (f) Opfin shall have the option of paying for an Indemnified
     Claim in cash, shares of New TAG Preferred (valued at its liquidation
     preference at the time), or shares of the common stock received upon
     conversion of the New TAG Preferred (valued at the conversion price at the
     time) or a combination thereof.

               (g)  For purposes of this Agreement, "Losses" shall mean any and
     all losses, damages and liabilities, joint or several, and expenses
     (including, without limitation, attorney fees and other costs of
     litigation, arbitration and settlement) suffered or incurred by an
     Indemnified Party in respect of an Indemnified Claim, (i) reduced by the
     Present Value Benefit realized or realizable by the Indemnified Party in
     connection with or as a result of the incurrence of such losses, claims,
     damages, liabilities and expenses and (ii) reduced by any applicable
     insurance proceeds actually received by the Indemnified Party.  If any such
     reduction is determined after payment by the Indemnifying Party of any
     amount otherwise required to be paid pursuant to this Article X, the
     Indemnified Party shall repay to the Indemnifying Party, promptly after
     such determination, any amount that the Indemnifying Party would not have
     had to pay pursuant to this Article X had such determination been made at
     the time of such payment.  Losses shall include (i) punitive damages
     awarded to a third party and (ii) consequential damages (but only if the
     Closing has occurred).  For

                                       58
<PAGE>
 
     purposes of indemnification under Section 10.1, as between PIMCO Advisors
     and TAG, PIMCO Advisors shall be deemed to suffer the Losses with respect
     to any of the Interests which are contributed to it by TAG.

                                   ARTICLE XI.

                              TERMINATION/SURVIVAL
                              --------------------

          Section 11.1.  Termination.
                         -----------

               (a)  This Agreement may be terminated on or prior to the Closing
     Date as follows:

                    (i)    by written consent of Opfin and TAG;

                    (ii)   by Opfin if the consents described in Section 8.3(g)
          have not been obtained within 90 days after the date hereof or the
          consents described in Section 8.3(j) or the commitments described in
          Section 7.20(a) have not been obtained within 30 days after the date
          hereof and by TAG or PIMCO Advisors if the consents described in
          Sections 8.3(e) and 8.3(f) have not been obtained within 90 days after
          the date hereof or if the consents described in  Section 8.3(h) have
          not been obtained within 30 days after the date hereof;

                    (iii)  by Opfin if there shall have been a material breach
          by PIMCO Advisors or TAG, or by PIMCO Advisors or TAG if there shall
          have been a material breach by Opfin of any of its representations and
          warranties set forth in this Agreement, which breach shall not have
          been cured within 20 Business Days following receipt by the breaching
          party of written notice of such breach from Opfin or PIMCO Advisors,
          as the case may be, which breach would entitle the party receiving
          such representation or warranty not to effect the Closing under
          Section 8.1(a) (in the case of a breach of representation or warranty
          by Opfin) or Section 8.2(a) (in the case of a breach of representation
          or warranty by TAG or PIMCO Advisors);

                    (iv)   by Opfin if there shall have been a material breach
          by TAG or PIMCO Advisors, or by TAG if there shall have been a
          material breach by Opfin or Opgroup, of any of their covenants or
          agreements set forth in this Agreement, which breach shall not have
          been cured within 20 Business Days following receipt by the breaching
          party of written notice of such breach from Opfin or TAG, as the case
          may be;

                    (v)    by TAG or PIMCO Advisors if an event shall have
          occurred which shall have had or could reasonably be expected to have,
          individually or in the aggregate with any other event occurring after
          such date, an Opgroup Material Adverse Effect;

                    (vi)   by Opfin if an event shall have occurred which shall
          have had or could reasonably be expected to have, individually or in
          the aggregate with any other event occurring after such date, a TAG
          Material Adverse Effect;

                                       59
<PAGE>
 
                    (vii)  by either if the IRS Ruling is unfavorable or if
          Opgroup is advised by the IRS that an Acceptable IRS Ruling will not
          be granted; and

                    (viii) by any party to this Agreement if the Closing has
          not occurred on or before the date which is the earlier of (i) that
          date which is ten days after the receipt of the Acceptable IRS Ruling
          and the fulfillment (and/or waiver) of all other conditions to Closing
          or (ii) October 31, 1997.

               Notwithstanding Section 11.1(a)(ii)-(vi) and (viii), a party who
     is, or whose Affiliate is, in material breach of any of its obligations or
     representations and warranties hereunder shall not have the right to
     terminate this Agreement pursuant to Section 11.1(a)(ii)-(vi) and (viii).

               (b)  The termination of this Agreement shall be effectuated by
     the delivery by the party terminating this Agreement to each other party of
     a written notice of such termination.  If this Agreement so terminates, it
     shall become null and void and have no further force or effect, except as
     provided in Section 11.2.

          Section 11.2.  Survival After Termination.
                         --------------------------

          If this Agreement is terminated in accordance with Section 11.1 and
the transactions contemplated hereby are not consummated, this Agreement shall
become void and of no further force and effect, except for the provisions of
Section 7.12 and Article X and the provisions of the Confidentiality Agreements
referred to in Section 7.9.  None of the parties hereto shall have any liability
in the event of a termination of this Agreement, except to the extent that such
termination results from the violation by such party of any of its obligations
under this Agreement or any agreement made as of the date hereof or subsequent
thereto pursuant to this Agreement.

                                 ARTICLE XII.


                                 MISCELLANEOUS
                                 -------------

          Section 12.1  Limitation on Liability.
                        -----------------------

               (a) Anything contained herein to the contrary notwithstanding, no
     recourse under or upon any obligation, covenant or agreement of Opfin or
     its Affiliates in this Agreement or any Transaction Document shall be had
     against any general partner, officer, director, shareholder or controlling
     person, whether past, present or future, of Opfin or its Affiliates or of
     any successor corporation or partnership, either directly or through any
     successor corporation or partnership, whether by virtue of any
     constitution, statute or rule of law, or by the enforcement of any
     assessment or penalty or otherwise; it being expressly understood that all
     such liability is hereby expressly waived as a condition of, and as a
     consideration for, the execution and performance of this Agreement.  It is
     understood that this limitation on recourse is made expressly for the
     benefit of any general partner of Opco LP and any officer or director of
     Opfin and their respective Affiliates and may be enforced by any of them.

               (b) Anything contained herein to the contrary notwithstanding, no
     recourse under or upon any obligation, covenant or agreement of TAG or
     PIMCO Advisors or their respective Affiliates in this Agreement or any
     Transaction Document (except with

                                       60
<PAGE>
 
     respect to the obligations of TAG to PIMCO Advisors in the Keepwell
     Agreement and the PIMCO Advisors Purchase Agreement) shall be had against
     any general partner, officer, director, board member, shareholder,
     controlling person, whether past, present or future, of TAG or PIMCO
     Advisors or their respective Affiliates or of any successor corporation or
     partnership, either directly or through any successor corporation or
     partnership, whether by virtue of any constitution, statute or rule of law,
     or by the enforcement of any assessment or penalty or otherwise; it being
     expressly understood that all such liability is hereby expressly waived as
     a condition of, and as a consideration for, the execution and performance
     of this Agreement. It is understood that this limitation on recourse is
     made expressly for the benefit of any general partner of PIMCO Advisors and
     any officer or director of TAG and their respective Affiliates and may be
     enforced by any of them.

          Section 12.2.  No Right of Set Off.
                         -------------------

               (a)  Each of TAG and PIMCO Advisors agrees for itself, and its
     successors and assigns, that it shall have no right to set off any amounts
     that may be owed to it by Opfin, Opgroup, or any Trustee under this
     Agreement or any Transaction Document against any amounts payable by it to
     Opfin, Opgroup, or any Trustee (including but not limited to payments with
     respect to the New TAG Preferred).

               (b)   Opfin agrees for itself, and its subsidiaries, successors
     and assigns, that it shall have no right to set off any amounts that may be
     owed to it by TAG or PIMCO Advisors under this Agreement or any Transaction
     Document against any amounts payable by it to TAG or PIMCO Advisors.

          Section 12.3.  Amendments; Waiver.
                         ------------------

          This Agreement may not be amended, modified or waived except by
written instrument executed by the parties hereto.

          Section 12.4.  Entire Agreement.
                         ----------------

          This Agreement (including Annexes, Schedules, Exhibits, certificates
and lists referred to herein, and any documents executed by the parties
simultaneously herewith or pursuant hereto) constitutes the entire agreement of
the parties hereto, except as provided herein, and supersedes all prior
agreements and understandings, written and oral, among the parties with respect
to the subject matter hereof.

          Section 12.5.  Interpretation.
                         --------------

          When a reference is made in this Agreement to Sections, Annexes,
Schedules or Exhibits, such reference shall be to a Section of or Annex,
Schedule or Exhibit to this Agreement unless otherwise indicated.  The table of
contents and headings contained in this Agreement are for reference purposes
only and shall not affect in any way the meaning or interpretation of this
Agreement.  Whenever the words "include," "includes" or "including" are used in
this Agreement, they shall be deemed to be followed by the words "without
limitation."  The phrases "the date of this Agreement," "the date hereof" and
terms of similar import, unless the context otherwise requires, shall be deemed
to refer to the date set forth in the first paragraph of this Agreement.

                                       61
<PAGE>
 
          Section 12.6.  Severability.
                         ------------

          Any term or provision of this Agreement which is invalid or
unenforceable in any jurisdiction shall, as to that jurisdiction, be ineffective
to the extent of such invalidity or unenforceability without rendering invalid
or unenforceable the remaining terms and provisions of this Agreement or
affecting the validity or enforceability of any of the terms or provisions of
this Agreement in any other jurisdiction.  If any provision of this Agreement is
so broad as to be unenforceable, the provision shall be interpreted to be only
so broad as is enforceable.

          Section 12.7.  Notices.
                         -------

          All notices and other communications hereunder shall be in writing and
shall be deemed given (a) when delivered in person, (b) when transmitted by
telecopy (with written confirmation), (c) on the third Business Day following
the mailing thereof by certified or registered mail (return receipt requested)
or (d) when delivered by an express courier (with written confirmation) to the
parties at the following addresses (or at such other address for a party as
shall be specified by like notice):

          If to Opfin:

          Oppenheimer Financial Corp.
          Oppenheimer Tower
          World Financial Center
          200 Liberty Street
          New York, New York  10281
          Attention: Roger W. Einiger
          Telephone:  (212) 667-5050
          Telecopy:   (212) 667-5088

          With a copy to:

          Oppenheimer & Co., L.P.
          Oppenheimer Tower
          World Financial Center
          200 Liberty Street
          New York, New York  10281
          Attention: Robert I. Kleinberg, Esq.
          Telephone:  (212) 667-7300
          Telecopy:   (212) 945-2369

          and to:
          Weil, Gotshal & Manges LLP
          767 Fifth Avenue
          New York, New York 10153
          Attention:  Robert Todd Lang, Esq.
          Telephone:  (212) 310-8000
          Telecopy:   (212) 310-8007
     
          If to TAG:

                                       62
<PAGE>
 
          Thomson Advisory Group Inc.
          c/o PIMCO Advisors L.P.
          800 Newport Center Drive, Suite 100
          Newport Beach, California 92660
          Attention: General Counsel
          Telephone:  (714) 717-7022
          Telecopy:   (714) 717-7076

          If to PIMCO Advisors:

          PIMCO Advisors L.P.
          800 Newport Center Drive, Suite 100
          Newport Beach, California 92660
          Attention: General Counsel
          Telephone:  (714) 717-7022
          Telecopy:   (714) 717-7076

          With a copy to:

          Latham & Watkins
          650 Town Center Drive
          Costa Mesa, California 92626
          Attention: David C. Flattum
          Telephone:  (714) 540-1235
          Telecopy:   (714) 755-8290

          Section 12.8.  Binding Effect; No Third Party Beneficiaries; No 
                         ------------------------------------------------
Assignment
- ----------

          This Agreement shall inure to the benefit of and be binding upon the
parties hereto and their respective successors and permitted assigns.  Nothing
in this Agreement is intended or shall be construed to confer upon any entity or
Person other than the parties hereto and their respective successors and
permitted assigns any right, remedy or claim under or by reason of this
Agreement or any part hereof.  This Agreement may not be assigned by any party
hereto without the prior written consent of the other party hereto.

          Section 12.9.  Counterparts.
                         ------------

          This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which taken together shall
constitute one and the same agreement, it being understood that all of the
parties need not sign the same counterpart.

          Section 12.10. Governing Law.
                         -------------

     THIS AGREEMENT, THE LEGAL RELATIONS BETWEEN THE PARTIES AND THE
ADJUDICATION AND THE ENFORCEMENT THEREOF, SHALL BE GOVERNED BY AND INTERPRETED
AND CONSTRUED IN ACCORDANCE WITH THE SUBSTANTIVE LAWS OF THE STATE OF NEW YORK,
WITHOUT REGARD TO APPLICABLE CHOICE OF LAW PROVISIONS THEREOF.

                                       63
<PAGE>
 
          Section 12.11. WAIVER OF JURY TRIAL AND PUNITIVE DAMAGES.


          AFTER THE CLOSING DATE, THE PARTIES TO THIS AGREEMENT AGREE TO WAIVE
ANY RIGHT TO A JURY TRIAL AS TO ALL DISPUTES, AND ANY RIGHT TO SEEK PUNITIVE
DAMAGES.

                                       64
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Agreement and
Plan of Merger to be executed as of the date first above written.


                                                 OPPENHEIMER FINANCIAL CORP.
 
 
 
                                                 By:
                                                      -------------------------
                                                 Name:
                                                        -----------------------
                                                 Title:
                                                         ----------------------
 
 
 
                                                 OPPENHEIMER GROUP, INC.
 
 
 
                                                 By:
                                                      --------------------------
                                                 Name:
                                                        ------------------------
                                                 Title:
                                                         -----------------------
 

 
                                                 THOMSON ADVISORY GROUP INC.
 
 
 
                                                 By:
                                                      --------------------------
                                                 Name:
                                                        ------------------------
                                                 Title:
                                                         -----------------------
 
 

                                                 PIMCO ADVISORS L.P
 
 

                                                 By:
                                                      --------------------------
                                                 Name:   William D. Cvengros
                                                 Title:  Chief Executive Officer
 

                                    

                                       65

<PAGE>
 
                                                                    EXHIBIT 99.1

Agreement to Furnish Exhibits and Schedules

The Registrant agrees to furnish to the Commission upon request copies of all 
exhibits and schedules to the Agreement and Plan of Merger dated as of February 
13, 1997 by and among Oppenheimer Group, Inc., Oppenheimer Financial Corp., 
PIMCO Advisors L.P. and Thomson Advisory Group Inc.


                                                PIMCO Advisors L.P.

                                                By: /s/ ROBERT FITZGERALD
                                                    ---------------------------
                                                        Robert Fitzgerald
                                                        Chief Financial Officer


<PAGE>

                                                                    EXHIBIT 99.2
 
                             [LETTERHEAD OF PIMCO]

FOR IMMEDIATE RELEASE

                     PIMCO ADVISORS AND OPPENHEIMER GROUP
                           SIGN DEFINITIVE AGREEMENT

NEWPORT BEACH, CA (February 14, 1997) -- PIMCO Advisors L.P. (NYSE: PA) and 
Oppenheimer Group, Inc. and its subsidiary, Oppenheimer Financial Corp., today 
jointly announced they have signed a definitive agreement for PIMCO Advisors and
its affiliate, Thomson Advisory Group Inc. (TAG Inc.), to acquire a one-third, 
managing general partner interest in Oppenheimer Capital, the 1 percent general 
partner interest in Oppenheimer Capital, L.P. (NYSE: OCC) and 100% of the stock 
of Advantage Advisers, an affiliate of Oppenheimer Group which manages eight 
closed-end funds. The transaction covers only the private interests Oppenheimer 
Group holds in Oppenheimer Capital and Oppenheimer Capital, L.P. and does not
include the publicly traded units of Oppenheimer Capital, L.P. The acquisition
is subject to certain client, lender, IRS and other approvals, expected to take
up to six months to complete.

The agreement provides for an overall price of approximately $265 million in 
preferred stock and assumption of debt. To facilitate the acquisition, 
Oppenheimer Group will spin off all of its stock in Oppenheimer Financial, which
will own the brokerage business of Oppenheimer & Co., Inc. TAG Inc., a limited 
partner of PIMCO Advisors, will then issue approximately $233 million of 
convertible preferred stock to the shareholders of Oppenheimer Group and will 
assume approximately $32 million in debt in exchange for the two general partner
interests and the stock of Advantage Advisers. Subsequent to that exchange, TAG 
Inc. will contribute the general partner interest in Oppenheimer Capital to 
PIMCO Advisors, which will issue approximately $233 million of new Class A 
Limited partner units, at $25.50 per unit, to TAG Inc. After the closing of the 
transaction, operating results for PIMCO Advisors will include its proportionate
share of the operating results of Oppenheimer Capital.

With $110 billion in assets managed by PIMCO Advisors and $48 billion managed by
Oppenheimer Capital, the transaction will create one of the nation's largest
investment management firms. The acquisition is expected to diversify product
lines and distribution channels for PIMCO Advisors. Approximately 73 percent of
PIMCO Advisors assets under management are now in fixed income investments,
while approximately 78 percent of Oppenheimer Capital's assets under management
are in equity investments.
<PAGE>
 
                                      -2-

Oppenheimer Capital will function as an indirect subsidiary of PIMCO Advisors 
with the same investment personnel and process it now employs. The transaction 
will have no impact on existing services to clients of PIMCO Advisors, 
Oppenheimer Capital or Oppenheimer & Co., Inc. the companies said.

Oppenheimer Capital is one of the nation's leading investment management firms, 
with more than $48 billion in assets under management. It is well known for its 
value-based investment disciplines, primarily in equity management, serving a 
broad range of institutional clients, including public and private funds, 
jointly trusteed funds, endowments, foundations, and individuals. Oppenheimer 
Capital is headquartered in New York, NY.

PIMCO Advisors is a leading investment management organization with more than 
$110 billion in assets under management. Its six affiliated investment 
management firms are widely recognized for providing consistent performance and 
high quality service for many of the nation's corporate and public pension 
funds, endowments and foundations. Its affiliated mutual fund complex provides 
institutional-quality investment management to individual investors and 
institutions. The partnership is headquartered in Newport Beach, CA.

                                     ####


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