Exhibit 4 FORM OF AGREEMENT AND PLAN OF REORGANIZATION THIS AGREEMENT AND PLAN OF REORGANIZATION (the "Agreement") is made as of this [__] day of [__], 200_, by and among Janus Adviser Series, a Delaware statutory trust (the "JAD Trust"), on behalf of Janus Adviser [___]Fund, a series of the JAD Trust (the "Predecessor Fund"), Janus Investment Fund (the "JIF Trust"), a Massachusetts business trust, on behalf of Janus [___] Fund a series of the JIF Trust (the "Successor Fund"), and Janus Capital Management LLC, a Delaware limited liability company ("JCM"). All references in this Agreement to action taken by the Predecessor Fund or the Successor Fund shall be deemed to refer to action taken by the JIF Trust or JAD Trust on behalf of the respective portfolio series. This Agreement is intended to be and is adopted as a plan of reorganization and liquidation within the meaning of Section 368(a) of the United States Internal Revenue Code of 1986, as amended (the "Code"). The reorganization (the "Reorganization") will consist of the transfer by the Predecessor Fund of all or substantially all of its assets to the Successor Fund, in exchange solely for [Class A, Class C, Class I, Class R and Class S] voting shares of beneficial interest in the Successor Fund (the "Successor Fund Shares") having an aggregate net asset value equal to the aggregate net asset value of the same class of shares of the Predecessor Fund, the assumption by the Successor Fund of all the liabilities of the Predecessor Fund, and the distribution of the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares to the shareholders of the Predecessor Fund in complete liquidation of the Predecessor Fund as provided herein, all upon the terms and conditions hereinafter set forth in this Agreement. WHEREAS, the Board of Trustees of each of the JAD Trust and the JIF Trust has determined that it is in the best interest of the Predecessor Fund and the Successor Fund, respectively, that the assets of the Predecessor Fund be acquired by the Successor Fund pursuant to this Agreement and in accordance with the applicable statutes of the Commonwealth of Massachusetts and the State of Delaware, and that the interests of existing shareholders will not be diluted as a result of this transaction; WHEREAS, concurrently herewith, the Board of Trustees of each of the JAD Trust and the JIF Trust are entering into separate Plans of Reorganization which contemplate the reorganization of certain series of the JAD Trust into existing series of the JIF Trust (each a "Preexisting Fund Reorganization"); and WHEREAS, concurrently herewith, the Board of Trustees of each of the JAD Trust and the JIF Trust are entering into separate Plans of Reorganization which contemplate the reorganization of certain series of the JAD Trust into newly created series of the JIF Trust (each a "Shell Reorganization"). NOW, THEREFORE, in consideration of the premises and of the covenants and agreements hereinafter set forth, the parties hereto covenant and agree as follows: 1. PLAN OF REORGANIZATION 1.1 Subject to the terms and conditions herein set forth, the JAD Trust shall (i) transfer all or substantially all of the assets of the Predecessor Fund, as set forth in paragraph 1.2, to the Successor Fund, (ii) the JIF Trust shall cause the Successor Fund to deliver to the JAD Trust full and fractional [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares having an aggregate net asset value equal to the value of the aggregate net assets of the same class of shares of the Predecessor Fund as of the close of regular session trading on the New York Stock Exchange on the Closing Date, as set forth in paragraph 2.1 (the "Closing Date") and (iii) the JIF Trust shall cause the Successor Fund to assume all liabilities of the Predecessor Fund, as set forth in paragraph 1.2. Such transactions shall take place at the closing provided for in paragraph 2.1 (the "Closing"). 1.2 The assets of the Predecessor Fund to be acquired by the Successor Fund shall consist of all property, including, without limitation, all cash, securities, commodities and futures interests, and dividends or interest receivable which are owned by the Predecessor Fund and any deferred or prepaid expenses shown as an asset on the books of the Predecessor Fund on the Closing Date. The Successor Fund will assume all of the liabilities, expenses, costs, charges and reserves of the Predecessor Fund of any kind, whether absolute, accrued, contingent or otherwise in existence on the Closing Date. 1.3 The Predecessor Fund will distribute pro rata to its shareholders of record of the applicable classes, determined as of immediately after the close of business on the Closing Date (the "Current Shareholders"), the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares received by the JAD Trust pursuant to paragraph 1.1. Such distribution and liquidation will be accomplished by the transfer of the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares then credited to the accounts of the Predecessor Fund on the books of the Successor Fund to open accounts on the share records of the Successor Fund in the names of the Current Shareholders and representing the respective pro rata number of the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares due to such shareholders. All issued and outstanding shares of the Predecessor Fund will simultaneously be canceled on the books of the JAD Trust. The Successor Fund shall not issue certificates representing the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares in connection with such exchange. Ownership of [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares will be shown on the books of the JIF Trust's transfer agent. As soon as practicable after the Closing, the JAD Trust shall take all steps necessary to effect a complete liquidation of the Predecessor Fund. 2. CLOSING AND CLOSING DATE 2.1 The Closing Date shall be July 6, 2009, or such other date as the parties may agree to in writing. All acts taking place at the Closing shall be deemed to take place simultaneously as of immediately after the close of business on the Closing Date unless otherwise agreed to by the parties. The close of business on the Closing Date shall be as of 4:00 p.m. New York Time. The Closing shall be held at the offices of JCM, 151 Detroit Street, Denver, Colorado 80206-4805, or at such other time and/or place as the parties may agree. 2.2 The JAD Trust shall cause Janus Services LLC (the "Transfer Agent"), transfer agent of the Predecessor Fund, to deliver at the Closing a certificate of an authorized officer stating that its records contain the names and addresses of the Current Shareholders and the number, class, and percentage ownership of outstanding shares of the Predecessor Fund owned by each such shareholder immediately prior to the Closing. The Successor Fund shall issue and deliver a confirmation evidencing the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares to be credited on the Closing Date to the Secretary of the JAD Trust or provide evidence satisfactory to the JAD Trust that such [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares have been credited to the accounts of the Predecessor Fund on the books of the Successor Fund. At the Closing, each party shall deliver to the other such bills of sales, checks, assignments, share certificates, if any, receipts or other documents as such other party or its counsel may reasonably request. 3. REPRESENTATIONS AND WARRANTIES 3.1 The JAD Trust, on behalf of the Predecessor Fund, hereby represents and warrants to the Successor Fund as follows: (i) the JAD Trust is a trust duly organized, validly existing and in good standing under the laws of the State of Delaware and has full power and authority to conduct its business as presently conducted; (ii) the JAD Trust has full power and authority to execute, deliver and carry out the terms of this Agreement on behalf of the Predecessor Fund; (iii) the execution and delivery of this Agreement on behalf of the Predecessor Fund and the consummation of the transactions contemplated hereby are duly authorized and no other proceedings on the part of the JAD Trust or the shareholders of the Predecessor Fund are necessary to authorize this Agreement and the transactions contemplated hereby; (iv) this Agreement has been duly executed by the JAD Trust on behalf of the Predecessor 2 Fund and constitutes its valid and binding obligation, enforceable in accordance with its terms, subject to applicable bankruptcy, reorganization, insolvency, moratorium and other rights affecting creditors' rights generally, and general equitable principles; (v) neither the execution and delivery of this Agreement by the JAD Trust on behalf of the Predecessor Fund, nor the consummation by the JAD Trust on behalf of the Predecessor Fund of the transactions contemplated hereby, will conflict with, result in a breach or violation of or constitute (or with notice, lapse of time or both) a breach of or default under, the JAD Trust's Amended and Restated Trust Instrument ("JAD Trust Instrument") or Bylaws of the JAD Trust, as each may be amended, or any statute, regulation, order, judgment or decree, or any instrument, contract or other agreement to which the JAD Trust is a party or by which the JAD Trust or any of its assets is subject or bound; (vi) the unaudited statement of assets and liabilities of the Predecessor Fund as of the Closing Date, determined in accordance with generally accepted accounting principles consistently applied from the prior audited period, accurately reflects all liabilities of the Predecessor Fund as of the Closing Date; (vii) no authorization, consent or approval of any governmental or other public body or authority or any other party is necessary for the execution and delivery of this Agreement by the JAD Trust on behalf of the Predecessor Fund or the consummation of any transactions contemplated hereby by the JAD Trust, other than as shall be obtained at or prior to the Closing; (viii) On the Closing Date, all Federal and other tax returns, dividend reporting forms, and other tax-related reports of the Predecessor Fund required by law to have been filed by such date (including any extensions) shall have been filed and are or will be correct in all material respects, and all Federal and other taxes shown as due or required to be shown as due on said returns and reports shall have been paid or provision shall have been made for the payment thereof; and (ix) For each taxable year of its operation (including the taxable year which ends on the Closing Date), the Predecessor Fund has met (or will meet) the requirements of Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code") for qualification as a regulated investment company, has been (or will be) eligible to and has computed (or will compute) its federal income tax under Section 852 of the Code, and will have distributed all of its investment company taxable income and net capital gain (as defined in the Code) that has accrued through the Closing Date. 3.2 The JIF Trust, on behalf of the Successor Fund, hereby represents and warrants to the Predecessor Fund as follows: (i) the JIF Trust is duly organized and existing under its Amended and Restated Declaration of Trust (the "JIF Declaration of Trust") and the laws of the Commonwealth of Massachusetts as a voluntary association with transferable shares of beneficial interest commonly referred to as a "Massachusetts business trust"; (ii) the JIF Trust has full power and authority to execute, deliver and carry out the terms of this Agreement on behalf of the Successor Fund; (iii) the execution and delivery of this Agreement on behalf of the Successor Fund and the consummation of the transactions contemplated hereby are duly authorized and no other proceedings on the part of the JIF Trust or the shareholders of the Successor Fund are necessary to authorize this Agreement and the transactions contemplated hereby; (iv) this Agreement has been duly executed by the JIF Trust on behalf of the Successor Fund 3 and constitutes its valid and binding obligation, enforceable in accordance with its terms, subject to applicable bankruptcy, reorganization, insolvency, moratorium and other rights affecting creditors' rights generally, and general equitable principles; (v) neither the execution and delivery of this Agreement by the JIF Trust on behalf of the Successor Fund, nor the consummation by the JIF Trust on behalf of the Successor Fund of the transactions contemplated hereby, will conflict with, result in a breach or violation of or constitute (or with notice, lapse of time or both constitute) a breach of or default under, the JIF Declaration of Trust or the Amended and Restated Bylaws of the JIF Trust, as each may be amended, or any statute, regulation, order, judgment or decree, or any instrument, contract or other agreement to which the JIF Trust is a party or by which the JIF Trust or any of its assets is subject or bound; (vi) the net asset value per share of a [Class A, Class C, Class I, Class R and Class S] Successor Fund Share as of the close of regular session trading on the New York Stock Exchange on the Closing Date reflects all liabilities of the Successor Fund as of that time and date; (vii) no authorization, consent or approval of any governmental or other public body or authority or any other party is necessary for the execution and delivery of this Agreement by the JIF Trust on behalf of the Successor Fund or the consummation of any transactions contemplated hereby by the JIF Trust, other than as shall be obtained at or prior to the Closing; (viii) On the Closing Date, all Federal and other tax returns, dividend reporting forms, and other tax-related reports of the Successor Fund required by law to have been filed by such date (including any extensions) shall have been filed and are or will be correct in all material respects, and all Federal and other taxes shown as due or required to be shown as due on said returns and reports shall have been paid or provision shall have been made for the payment thereof; and (ix) For each taxable year of its operation (including the taxable year which includes the Closing Date), the Successor Fund has met (or will meet) the requirements of Subchapter M of the Code for qualification as a regulated investment company, has been (or will be) eligible to and has computed (or will compute) its federal income tax under Section 852 of the Code, and has distributed all of its investment company taxable income and net capital gain (as defined in the Code) for periods ending prior to the Closing Date. 4. CONDITIONS PRECEDENT 4.1 The obligations of the JAD Trust on behalf of each Predecessor Fund and the JIF Trust on behalf of each Successor Fund to effectuate the Reorganization shall be subject to the satisfaction of the following conditions with respect to such Reorganization: (i) The JIF Trust shall have filed with the Securities and Exchange Commission (the "Commission") a registration statement on Form N-14 under the Securities Act of 1933, as amended (the "Securities Act") and such amendment or amendments thereto as are determined by the Board of Trustees of the JIF Trust and/or JCM to be necessary and appropriate to effect the registration of the [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares (the "Registration Statement"), and the Registration Statement shall have become effective, and no stop-order suspending the effectiveness of the Registration Statement shall have been issued, and no proceeding for that purpose shall have been initiated or threatened by the Commission (and not withdrawn or terminated); (ii) The applicable [Class A, Class C, Class I, Class R and Class S] Successor Fund Shares 4 shall have been duly qualified for offering to the public in all states in which such qualification is required for consummation of the transactions contemplated hereunder; (iii) All representations and warranties of the JAD Trust on behalf of the Predecessor Fund contained in this Agreement shall be true and correct in all material respects as of the date hereof and as of the Closing, with the same force and effect as if then made, and the JIF Trust on behalf of the Successor Fund shall have received a certificate of an officer of the JAD Trust acting on behalf of the Predecessor Fund to that effect in form and substance reasonably satisfactory to the JIF Trust on behalf of the Successor Fund; (iv) All representations and warranties of the JIF Trust on behalf of the Successor Fund contained in this Agreement shall be true and correct in all material respects as of the date hereof and as of the Closing, with the same force and effect as if then made, and the JAD Trust on behalf of the Predecessor Fund shall have received a certificate of an officer of the JIF Trust acting on behalf of the Successor Fund to that effect in form and substance reasonably satisfactory to the JAD Trust on behalf of the Predecessor Fund; (v) The JIF Trust and the JAD Trust shall have received the opinion of Dechert LLP addressed to each of them substantially to the effect that, based upon certain facts, assumptions, and representations, the transaction contemplated by this Agreement shall constitute a tax-free reorganization for Federal income tax purposes. The delivery of such opinion is conditioned upon receipt by Dechert LLP of representations it shall request of JCM, the JIF Trust and the JAD Trust. Notwithstanding anything herein to the contrary, neither the JIF Trust nor the JAD Trust may waive the condition set forth in this paragraph; (vi) Unless otherwise determined by the officers of the Predecessor Fund, the Predecessor Fund shall have declared and paid a distribution or distributions prior to the Closing that, together with all previous distributions, shall have the effect of distributing to its shareholders (i) all of its investment company taxable income and all of its net realized capital gains, if any, for the period from the close of its last fiscal year to 4:00 p.m. New York Time on the Closing; and (ii) any undistributed investment company taxable income and net realized capital gains from any period to the extent not otherwise already distributed; and (vii) The conditions precedent to (A) each of the Preexisting Fund Reorganizations and (B) each of the Shell Reorganizations shall have been satisfied, unless the Board of Trustees of the JAD Trust and/or the JIF Trust shall have waived this condition and deemed it to be in the best interests of Shareholders of the Predecessor Fund that the Reorganization should proceed. 5. EXPENSES All of the expenses and costs of the Reorganization and the transactions contemplated thereby shall be borne by JCM. 6. ENTIRE AGREEMENT The JAD Trust agrees on behalf of the Predecessor Fund and the JIF Trust agrees on behalf of the Successor Fund that this Agreement constitutes the entire agreement between the parties. 7. TERMINATION This Agreement and the transactions contemplated hereby may be terminated and abandoned by resolution of the Board of Trustees of the JIF Trust or the Board of Trustees of the JAD Trust, at any time prior to the Closing Date, if circumstances should develop that, in the opinion of the Board of Trustees of the JIF Trust 5 or the Board of Trustees of the JAD Trust, make proceeding with the Agreement inadvisable. 8. AMENDMENTS This agreement may be amended, modified or supplemented in such manner as may be mutually agreed upon in writing by the parties. 9. NOTICES Any notice, report, statement or demand required or permitted by any provisions of this Agreement shall be in writing and shall be given by prepaid telegraph, telecopy or certified mail addressed to the parties hereto at their principal place of business. 10. HEADINGS; COUNTERPARTS; GOVERNING LAW; ASSIGNMENT; LIMITATION OF LIABILITY 10.1 The Article and paragraph headings contained in this Agreement are for reference purposes only and shall not affect in any way the meaning or interpretation of this Agreement. 10.2 This Agreement may be executed in any number of counterparts each of which shall be deemed an original. 10.3 This Agreement shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts. 10.4 This Agreement shall bind and inure to the benefit of the parties hereto and their respective successors and assigns, but no assignment or transfer hereof or of any rights or obligations hereunder shall be made by any party without the written consent of the other party. Nothing herein expressed or implied is intended or shall be construed to confer upon or give any person, firm or corporation, other than the parties hereto and their respective successors and assigns, any rights or remedies under or by reason of this Agreement. 10.5 It is expressly agreed that the obligations of each of the JIF Trust and JAD Trust hereunder shall not be binding upon any of the Trustees, shareholders, nominees, officers, agents or employees of each trust personally, but shall bind only the trust property of the trusts, as provided in the JAD Trust Instrument and the JIF Declaration of Trust, respectively, of each trust. The execution and delivery by such officers of the Trusts shall not be deemed to have been made by any of them individually or to impose any liability on any of them personally, but shall bind only the trust property of each Trust as provided in the JAD Trust Instrument and the JIF Declaration of Trust, respectively. The JAD Trust is a series company with multiple series and has entered into this Agreement on behalf of the Predecessor Fund. The JIF Trust is a series company with multiple series and has entered into this Agreement on behalf of the Successor Fund. 10.6 The sole remedy of a party hereto for a breach of any representation or warranty made in this Agreement by the other party shall be an election by the non-breaching party not to complete the transactions contemplated herein. 6 IN WITNESS WHEREOF, the undersigned has caused this Agreement to be executed as of the date set forth above. ATTEST JANUS ADVISER SERIES For and on behalf of the Predecessor Fund Name: By: ------------------------------- ------------------------------------ Name: Title: ATTEST JANUS INVESTMENT FUND For and on behalf of the Successor Fund Name: By: ------------------------------- ------------------------------------ Name: Title: ATTEST JANUS CAPITAL MANAGEMENT LLC Name: By: ------------------------------- ------------------------------------ Name: Title: 7