BINGHAM McCUTCHEN Bingham McCutchen LLP One Federal Street Boston, MA 02110-1726 T 617.951.8000 F 617.951.8736 April 2, 2009 VIA EDGAR - --------- Dominic Minore Securities and Exchange Commission Division of Investment Management 100 F Street, NE Washington, D.C. 20549 Re: The Registrants Listed on the Attached Appendix A (each, a "Registrant") Registration Statement on Form N-14 Dear Mr. Minore: On behalf of each of the Registrants, we are filing this letter to respond in writing to the Staff's comments on Pre-Effective Amendment No. 1 to the Registrant's Registration Statement on Form N-14 relating to the proposed reorganization of a series of Regions Morgan Keegan Select Funds into a series of the Registrant, as set forth on Appendix B (collectively, the "Amendments"). Each Amendment was filed with the Securities and Exchange Commission (the "Commission") on March 30, 2009. The Staff's comments were conveyed to us as representatives of the Registrants by telephone on March 30, 2009. Below are the Staff's comments on the Amendments and the Registrants' responses thereto. Comment 1. The Staff requested that the Registrants file a supplemental response letter including both the Staff's comments and the Registrants' responses thereto. Response: This letter is being filed in response to the Staff's request. Comment 2. In the bullet point under "Why Do the RMK Trustees Recommend the Reorganizations?" relating to pro forma management fees, remove "in most cases" and revise the sentence to state that the pro forma management fee for each Pioneer Fund is the same or lower than the current management fee of the corresponding RMK Fund, "except in the following cases." 1 Response: The disclosure has been revised as requested by the Staff. Comment 3. The Staff asked that a separate question and answer be added to highlight that, based on those assumptions discussed in Proposal 11, a further extension of the Treasury's Temporary Guarantee Program for Money Market Funds (the "Program") would increase the pro forma net expense ratios of Pioneer Cash Reserves Fund such that they would be higher than those of the Regions Morgan Keegan Select Money Market Fund. The Staff also requested that the answer to the question "Do any Pioneer Funds Have Higher Pro Forma Gross Expense Ratios Than the Corresponding RMK Fund?" be revised to note the impact of a further extension of the Program on Pioneer Cash Reserves Fund's gross expense ratios. Response: In response to the Staff's comments, a new question and answer has been added and the answer to the gross expense ratio question has been supplemented. Comment 4. The Staff asked that the answer to the question "Will Pioneer and MAM Benefit from the Reorganizations?" be supplemented to include the purchase price to be paid by MAM to Pioneer. Response: The answer has been supplemented consistent with the Staff's comment. Comment 5. The Staff asked that, consistent with Section 15(f)(2)(B) of the Investment Company Act of 1940, as amended, the Registrants confirm that, as a result of the transaction, there are no arrangements that obligate the Pioneer Funds, Pioneer or any of Pioneer's affiliates to execute brokerage transactions for the Pioneer Funds with MAM or any of its affiliates. Response: The Registrants so confirm. Comment 6. Under the question "What are the Federal Income Tax Consequences of the Reorganizations?", disclose that a distribution will be made to the relevant RMK Fund shareholders immediately prior to the eight substantive reorganizations, and add a cross reference in the answer to the discussion on page 204 of the Proxy Statement/Prospectus relating to such distributions. In addition, under "Reasons for the Proposed Reorganization" in each proposal relating to a substantive reorganization, include a cross reference to the same discussion on page 204. Response: The Registrants note that disclosure indicating that a distribution will be made to the relevant RMK Fund shareholders immediately prior to each substantive reorganization is included under the question "What are the Federal Income Tax Consequences of the Reorganizations?" The Registrants have added a cross references and made the other requested revisions. Comment 7. In Proposal 11, wherever the net expense ratios of Pioneer Cash Reserves Fund are mentioned, include a reference to the impact of a further extension of the Program on the Fund's net expense ratios. 2 Response: The disclosure has been supplemented. Comment 8. Under "Investment Restrictions" in the Statement of Additional Information: (a) revise fundamental policy (8) for Pioneer Intermediate Tax Free Income Fund to reflect that the Fund's 80% policy also includes investing in securities that provide income that is not subject to the alternative minimum tax. Response: The requested revision has been made. (b) include as a non-fundamental investment policy for Pioneer Growth Fund and Pioneer Intermediate Tax Free Income Fund that each such Fund will not engage in mortgaging, hypothecating or pledging of its assets, in conformity with non-fundamental investment policy (5) for Pioneer Select Mid Cap Growth Fund. Response: The requested non-fundamental policies have been added. (c) include as a non-fundamental investment policy for Pioneer Growth Fund and Pioneer Intermediate Tax Free Income Fund that each such Fund will not purchase securities on margin, in conformity with non-fundamental investment policy (6) for Pioneer Select Mid Cap Growth Fund. Response: The requested non-fundamental policies have been added. Please call the undersigned at (617) 951-8567 with any questions. Sincerely, /s/ Paul B. Raymond Paul B. Raymond 3 Appendix A Registrant File Nos. - ---------- --------- Pioneer Bond Fund 811-02864; 333-157342 Pioneer Fund 811-01466; 333-157321 Pioneer Mid Cap Value Fund 811-06106; 333-157312 Pioneer Money Market Trust 811-05099; 333-157315 Pioneer Series Trust I 811-21425; 333-157353 Pioneer Series Trust III 811-21664; 333-157336 Pioneer Series Trust IV 811-21781; 333-157350 Pioneer Short Term Income Fund 811-21558; 333-157340 Appendix B Series of Regions Morgan Keegan Select Funds Corresponding Series of a Registrant - -------------------------------------------- ------------------------------------ Regions Morgan Keegan Select Mid Cap Growth Fund Pioneer Select Mid Cap Growth Fund (a series of Pioneer Series Trust I) Regions Morgan Keegan Select Growth Fund Pioneer Growth Fund (a series of Pioneer Series Trust I) Regions Morgan Keegan Select Core Equity Fund Pioneer Fund (the sole series of Pioneer Fund) Regions Morgan Keegan Select Mid Cap Value Fund Pioneer Mid Cap Value Fund (the sole series of Pioneer Mid Cap Value Fund) Regions Morgan Keegan Select Value Fund Pioneer Cullen Value Fund (a series of Pioneer Series Trust III) Regions Morgan Keegan Select Balanced Fund Pioneer Classic Balanced Fund (a series of Pioneer Series Trust IV) Regions Morgan Keegan Select Fixed Income Fund Pioneer Bond Fund (the sole series of Pioneer Bond Fund) Regions Morgan Keegan Select Limited Maturity Fixed Income Fund Pioneer Short Term Income Fund (the sole series of Pioneer Short Term Income Fund) Regions Morgan Keegan Select Intermediate Tax Exempt Bond Fund Pioneer Intermediate Tax Free Income Fund (a series of Pioneer Series Trust I) Regions Morgan Keegan Select Treasury Money Market Fund Pioneer Treasury Reserves Fund (a series of Pioneer Series Trust IV) Regions Morgan Keegan Select Money Market Fund Pioneer Cash Reserves Fund (a series of Pioneer Money Market Trust)