Registration No. 033-59474

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

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FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

POST-EFFECTIVE AMENDMENT NO. 182

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 182

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PRINCIPAL FUNDS, INC.

(Exact name of Registrant as specified in Charter)

655 9th Street

Des Moines, IA 50392

(Address of principal executive offices)

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Telephone Number (515) 235-1209

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	Copy to:
BRITNEY L. SCHNATHORST		JOSHUA B. DERINGER
The Principal Financial Group		Drinker Biddle & Reath, LLP
Des Moines, Iowa 50392		One Logan Square, Ste 2000
		Philadelphia, PA 19103-6996

(Name and address of agent for service)

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Approximate Date of Proposed Public Offering: as soon as practicable after the effectiveness date of this Registration Statement.

It is proposed that this filing will become effective (check appropriate box)

_X__    immediately upon filing pursuant to paragraph (b) of Rule 485

____    on (date) pursuant to paragraph (b) of Rule 485

____    60 days after filing pursuant to paragraph (a)(1) of Rule 485

____    on (date) pursuant to paragraph (a)(1) of Rule 485

____    75 days after filing pursuant to paragraph (a)(2) of Rule 485

____    on (date) pursuant to paragraph (a)(2) 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.

Title of Securities Being Registered: Class A, P, Institutional, R-3, R-4, R-5, and R-6 Shares

EXPLANATORY NOTE

This filing relates to the Registrant's prospectus dated March 29, 2016 for Classes R-3, R-4, and R-5 shares of the Blue Chip Fund and Diversified Real Asset Fund; Classes A, P, Institutional, and R-6 of the Multi-Manager Equity Long/Short Fund; and Class P of the Origin Emerging Markets Fund, which were included in post-effective amendment number 180 (as filed on March 29, 2016, SEC Accession No. 0000898745-16-001192), and is filed for the purpose of submitting interactive data files.

SIGNATURES
Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant has duly caused this Amendment to the Registration Statement to be signed on its behalf by the undersigned, duly authorized in the City of Des Moines and State of Iowa, on the 19th day of April, 2016.
	Principal Funds, Inc.    (Registrant) /s/ M. J. Beer _____________________________________ M. J. Beer Director, President and Chief Executive Officer
Attest: /s/ Beth Wilson ______________________________________ Beth Wilson Vice President and Secretary

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.
Signature	Title	Date
/s/ M. J. Beer __________________________ M. J. Beer	Director, President and Chief Executive Officer (Principal Executive Officer)	April 19, 2016
/s/ T. W. Bollin __________________________ T. W. Bollin	Chief Financial Officer (Principal Financial Officer)	April 19, 2016
/s/ L. A. Rasmussen __________________________ L. A. Rasmussen	Vice President and Controller (Controller)	April 19, 2016
(E. Ballantine)* __________________________ E. Ballantine	Director	April 19, 2016
(L. T. Barnes)* __________________________ L. T. Barnes	Director	April 19, 2016
(C. Damos)* __________________________ C. Damos	Director	April 19, 2016
(N. M. Everett)* __________________________ N. M. Everett	Chair	April 19, 2016
(M. A. Grimmett)* __________________________ M. A. Grimmett	Director	April 19, 2016
(F. S. Hirsch)* __________________________ F. S. Hirsch	Director	April 19, 2016
(T. Huang)* __________________________ T. Huang	Director	April 19, 2016
__________________________ D. Lawton	Director
(K. McMillan)* __________________________ K. McMillan	Director	April 19, 2016
(E. Nickels)* __________________________ E. Nickels	Director	April 19, 2016
(D. Pavelich)* __________________________ D. Pavelich	Director	April 19, 2016
* Pursuant to Power of Attorney appointing M. J. Beer Previously filed as Ex-99(j)(3) on 12/29/2014 (Accession No. 000898745-14-001274) and filed for E. Nickels as Ex-99(j)(3) on 12/21/2015 (Accession No. 0000898745-15-000800)

Exhibit No.Exhibits

Ex-101.INS    XBRL Instance Document

Ex-101.SCH    XBRL Taxonomy Extension Schema Document

Ex-101.CAL    XBRL Taxonomy Extension Calculations Linkbase Document

Ex-101.DEF    XBRL Taxonomy Extension Definition Linkbase Document

Ex-101.LAB    XBRL Taxonomy Extension Label Linkbase Document

Ex-101.PRE    XBRL Taxonomy Extension Presentation Linkbase Document