Form 485BXT NUVEEN INVESTMENT FUNDS

As filed with the Securities and Exchange Commission on May 8, 2026

1933 Act Registration No. 033-16905

1940 Act Registration No. 811-05309

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-1A

Nuveen Investment Funds, Inc.

(Exact Name of Registrant as Specified in Charter)

Registrant’s Telephone Number, Including Area Code: (312) 917-7700

Approximate Date of Proposed Public Offering: As soon as practicable after effectiveness.

Title of Securities Being Registered: Common Stock.

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

If appropriate, check the following box:

CONTENTS OF POST-EFFECTIVE AMENDMENT NO. 277

This Post-Effective Amendment to the Registration Statement comprises the following papers and contents:

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this post-effective amendment to its registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of Chicago and State of Illinois, on the 8th day of May, 2026.

Pursuant to the requirements of the Securities Act of 1933, as amended, this post-effective amendment to the registration statement has been signed below by the following persons in the capacities and on the date indicated.