Filed with the Securities and Exchange Commission on May 31, 2019

1933 Act Registration File No. 033-20827

1940 Act Registration File No. 811-05518

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		x
Pre-Effective Amendment No.		o
Post-Effective Amendment No.	253	x

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		x
Amendment No.	256	x

(Check Appropriate Box or Boxes)

THE RBB FUND, INC.

(Exact Name of Registrant as Specified in Charter)

615 East Michigan Street,

Milwaukee, Wisconsin  53202

(Address of Principal Executive Offices, including Zip Code)

Registrant’s Telephone Number, including Area Code: (609) 731-6256

Copies to:

SALVATORE FAIA	MICHAEL P. MALLOY, ESQUIRE
The RBB Fund, Inc.	Drinker Biddle & Reath LLP
615 East Michigan Street,	One Logan Square, Suite 2000
Milwaukee, Wisconsin  53202-5207	Philadelphia, Pennsylvania 19103-6996

Approximate Date of Proposed Public Offering: As soon as practicable after the Registration Statement becomes effective.

x immediately upon filing pursuant to paragraph (b)

o on (date) pursuant to paragraph (b)

o 60 days after filing pursuant to paragraph (a)(1)

o on (date) pursuant to paragraph (a)(1)

o 75 days after filing pursuant to paragraph (a)(2)

o on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

o This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Post-Effective Amendment (“PEA”) No. 253 to the Registration Statement for The RBB Fund, Inc. (the “Company”) on Form N-1A hereby incorporates Parts A, B and C from the Company’s PEA No. 252 on Form N-1A filed May 22, 2019. This PEA No. 253 is filed for the sole purpose of submitting the XBRL exhibit for the risk/return summary first provided in PEA No. 252 to the Company’s Registration Statement.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “1933 Act”), and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment to its Registration Statement under Rule 485(b) under the 1933 Act and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of Chadds Ford, and Commonwealth of Pennsylvania on May 31, 2019.

THE RBB FUND, INC.
By:	/s/ Salvatore Faia
	Salvatore Faia
	President

Pursuant to the requirements of the 1933 Act, this Amendment to Registrant’s Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

SIGNATURE	TITLE	DATE
/s/ Salvatore Faia	President (Principal Executive Officer) and Chief Compliance Officer	May 31, 2019
Salvatore Faia
/s/ James G. Shaw	Treasurer (Chief Financial Officer)	May 31, 2019
James G. Shaw	and Secretary
*J. Richard Carnall	Director	May 31, 2019
J. Richard Carnall
*Julian A. Brodsky	Director	May 31, 2019
Julian A. Brodsky
*Arnold M. Reichman	Director	May 31, 2019
Arnold M. Reichman
*Robert Sablowsky	Director	May 31, 2019
Robert Sablowsky
*Robert Straniere	Director	May 31, 2019
Robert Straniere
*Nicholas A. Giordano	Director	May 31, 2019
Nicholas A. Giordano
*Gregory P. Chandler	Director	May 31, 2019
Gregory P. Chandler
*Brian T. Shea	Director	May 31, 2019
Brian T. Shea

*By:	/s/ Salvatore Faia
Salvatore Faia
Attorney-in-Fact

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Julian A. Brodsky, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 16, 2017
	/s/ Julian A. Brodsky
	Julian A. Brodsky

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, J. Richard Carnall, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 16, 2017
	/s/ J. Richard Carnall
	J. Richard Carnall

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Nicholas A. Giordano, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 16, 2017
	/s/ Nicholas A. Giordano
	Nicholas A. Giordano

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Arnold M. Reichman, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 16, 2017
	/s/ Arnold M. Reichman
	Arnold M. Reichman

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Robert Sablowsky, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 16, 2017
	/s/ Robert Sablowsky
	Robert Sablowsky

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Robert A. Straniere, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 16, 2017
	/s/ Robert Straniere
	Robert Straniere

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Gregory P. Chandler, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	February 17, 2017
	/s/ Gregory P. Chandler
	Gregory P. Chandler

THE RBB FUND, INC.

(the “Company”)

POWER OF ATTORNEY

Know All Men by These Presents, that the undersigned, Brian T. Shea, hereby constitutes and appoints Salvatore Faia, Michael P. Malloy, James G. Shaw, Edward Paz, and Robert Amweg, his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director or officer, or both, of the Company, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in his name and on his behalf, in any and all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully and to all intents and purposes as he might or could do in person, said acts of said attorneys being hereby ratified and approved.

DATED:	May 10, 2018
	/s/ Brian T. Shea
	Brian T. Shea

INDEX TO EXHIBITS

Exhibit	Exhibit No.
Instance Document	EX-101.INS
Schema Document	EX-101.SCH
Definition Linkbase Document	EX-101.DEF
Label Linkbase Document	EX-101.LAB
Presentation Linkbase Document	EX-101.PRE