485BPOS 1 d455756d485bpos.txt PIONEER MULTI-ASSET ULTRASHORT INCOME FUND File No. 811-21108 333-89354 As filed with the Securities and Exchange Commission on January 7, 2013 ================================================================================ SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ----------------- FORM N-1A REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [X] Pre-Effective Amendment No. [X] Post-Effective Amendment No. 28 [X] and/or REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [X] Amendment No. 29 [X] (Check appropriate box or boxes) ----------------- PIONEER SERIES TRUST X (formerly, Pioneer Fundamental Growth Fund) (Exact Name of Registrant as Specified in Charter) ----------------- 60 State Street, Boston, Massachusetts 02109 (Address of Principal Executive Offices) (Zip Code) Registrant's Telephone Number, including Area Code: (617) 742-7825 ----------------- Terrence J. Cullen, Pioneer Investment Management, Inc. 60 State Street, Boston, Massachusetts 02109 (Name and Address of Agent for Service) ----------------- It is proposed that this filing will become effective (check appropriate box): [X]immediately upon filing pursuant to paragraph (b) [_]on [date] pursuant to paragraph (b) [_]60 days after filing pursuant to paragraph (a)(1) [_]on [date] pursuant to paragraph (a)(1) [_]75 days after filing pursuant to paragraph (a)(2) [_]on [date] pursuant to paragraph (a)(3) of Rule 485. If appropriate, check the following box: [_]This post-effective amendment designates a new effective date for a previously filed post-effective amendment. This filing relates solely to Pioneer Multi-Asset Ultrashort Income Fund, a series of the Registrant. ================================================================================ SIGNATURES Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Trust certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment No. 28 to its registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of Boston, and the Commonwealth of Massachusetts, on the 7th day of January, 2013. PIONEER SERIES TRUST X By: /s/ Daniel K. Kingsbury ----------------------------- Daniel K. Kingsbury Executive Vice President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities indicated below on January 7, 2013:
Signature Title John F. Cogan, Jr.* President (Principal Executive Officer) and John F. Cogan, Jr. Trustee Mark E. Bradley* Treasurer (Principal Financial and Accounting Mark E. Bradley Officer) David R. Bock* Trustee David R. Bock Mary K. Bush* Trustee Mary K. Bush Benjamin M. Friedman* Trustee Benjamin M. Friedman Margaret B. W. Graham* Trustee Margaret B. W. Graham /s/ Daniel K. Kingsbury ---------------------- Executive Vice President and Trustee Daniel K. Kingsbury Thomas J. Perna* Chairman of the Board and Trustee Thomas J. Perna Marguerite A. Piret* Trustee Marguerite A. Piret Stephen K. West* Trustee Stephen K. West *By: /s/ Daniel K. Kingsbury ---------------------- Dated: January 7, 2013 Daniel K. Kingsbury Attorney-in-Fact
EXHIBIT INDEX
Exhibit No. Description EX-101.INS XBRL Instance Document EX-101.SCH XBRL Taxonomy Extension Schema Document EX-101.CAL XBRL Taxonomy Extension Calculation Linkbase EX-101.DEF XBRL Taxonomy Extension Definition Linkbase EX-101.LAB XBRL Taxonomy Extension Labels Linkbase EX-101.PRE XBRL Taxonomy Extension Presentation Linkbase