Filed with the Securities and Exchange Commission on June 3, 2026

1933 Act Registration File No. 333-200168
1940 Act Registration File No. 811-23011

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549
 
FORM N-1A
 
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
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Pre-Effective Amendment No.
    
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Post-Effective Amendment No.
98
  
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and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
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Amendment No.
 101
  
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(Check appropriate box or boxes.)

THE RBB FUND TRUST
(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:
 
STEVEN PLUMP
 
JILLIAN BOSMANN, ESQUIRE
The RBB Fund Trust
 
Faegre Drinker Biddle & Reath LLP
615 East Michigan Street
 
One Logan Square, Suite 2000
Milwaukee, Wisconsin 53202
 
Philadelphia, Pennsylvania 19103-6996

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

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immediately upon filing pursuant to paragraph (b)
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on June 11, 2026 pursuant to paragraph (b)
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60 days after filing pursuant to paragraph (a)(1)
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on (date) pursuant to paragraph (a)(1)
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75 days after filing pursuant to paragraph (a)(2)
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on (date) pursuant to paragraph (a)(2) of Rule 485.
If appropriate, check the following box:

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

Designation of New Effective Date for Previously Filed Post-Effective Amendment

Post-Effective Amendment No. 81 (the “Amendment”) was filed pursuant to Rule 485(a)(2) under the Securities Act of 1933, as amended (the “1933 Act”), on January 20, 2026 and pursuant to Rule 485(a)(2) would have become effective on April 5, 2026.

Post-Effective Amendment No. 89 was filed pursuant to Rule 485(b)(1)(iii) under the 1933 Act on April 2, 2026 for the sole purpose of extending the date upon which the Amendment was to become effective to May 5, 2026.

Post-Effective Amendment No. 92 was filed pursuant to Rule 485(b)(1)(iii) under the 1933 Act on May 4, 2026 for the sole purpose of extending the date upon which the Amendment was to become effective to June 4, 2026.

This Post-Effective Amendment No. 98 is being filed pursuant to Rule 485(b)(1)(iii) under the 1933 Act for the sole purpose of designating June 11, 2026 as the new date upon which the Amendment shall become effective.

This Post-Effective Amendment No. 98 incorporates by reference the information contained in Parts A, B and C of the Amendment.
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 Short Hills and State of New Jersey on June 3, 2026.

THE RBB FUND TRUST

By: /s/ Steven Plump 
Steven Plump
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/ Steven Plump
 
President (Principal Executive Officer)
 
June 3, 2026
Steven Plump
 
 
 
 
 
 
 
 
/s/ James G. Shaw
 
Chief Financial Officer (Principal Financial and Accounting Officer)
 
June 3, 2026
James G. Shaw
    
 
 
 
 
 
 
 
*Gregory P. Chandler
 
Trustee
 
June 3, 2026
Gregory P. Chandler
 
 
 
 
 
 
 
 
 
*Lisa A. Dolly
 
Trustee
 
June 3, 2026
Lisa A. Dolly
 
 
 
 
 
 
 
 
 
*Nicholas A. Giordano
 
Trustee
 
June 3, 2026
Nicholas A. Giordano
 
 
 
 
 
 
 
 
 
*Arnold M. Reichman
 
Trustee
 
June 3, 2026
Arnold M. Reichman
 
 
 
 
 
 
 
 
 
*Robert Sablowsky
 
Trustee
 
June 3, 2026
Robert Sablowsky
 
 
 
 
 
 
 
 
 
*Brian T. Shea
 
Trustee
 
June 3, 2026
Brian T. Shea
 
 
 
 
         
*Martha A. Tirinnanzi
  
Trustee
  
June 3, 2026
Martha A. Tirinnanzi
        
 
*By:
/s/ James G. Shaw
 
James G. Shaw
 
Attorney-in-Fact
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Gregory P. Chandler, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. 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: July 9, 2025
 
 
 
/s/ Gregory P. Chandler
 
Gregory P. Chandler
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Lisa A. Dolly, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw her true and lawful attorneys, to execute in her name, place, and stead, in her capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in her name and on her 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 she might or could do in person, said acts of said attorneys being hereby ratified and approved.
 
DATED: July 9, 2025
 
 
 
/s/ Lisa A. Dolly
 
Lisa A. Dolly
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Nicholas A. Giordano, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. 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: July 9, 2025
 
 
 
/s/ Nicholas A. Giordano
 
Nicholas A. Giordano
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Arnold M. Reichman, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. 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: July 9, 2025
 
 
 
/s/ Arnold M. Reichman
 
Arnold M. Reichman
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Robert Sablowsky, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. 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: July 9, 2025
 
 
 
/s/ Robert Sablowsky
 
Robert Sablowsky
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Brian T. Shea, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw his true and lawful attorneys, to execute in his name, place, and stead, in his capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. 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: July 9, 2025
 
 
 
/s/ Brian T. Shea
 
Brian T. Shea
 
THE RBB FUND, INC.
(the “Company”)
 
THE RBB FUND TRUST
(the “Trust”)
 
POWER OF ATTORNEY
 
Know All Men by These Presents, that the undersigned, Martha A. Tirinnanzi, hereby constitutes and appoints Jillian L. Bosmann, Edward Paz, Steven Plump, and James G. Shaw her true and lawful attorneys, to execute in her name, place, and stead, in her capacity as Director/Trustee or officer, or both, of the Company and of the Trust, the Registration Statement and any amendments thereto and all instruments necessary or incidental in connection therewith, and to file the same with the U.S. Securities and Exchange Commission; and said attorneys shall have full power and authority to do and perform in her name and on her 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 she might or could do in person, said acts of said attorneys being hereby ratified and approved.
 
DATED: July 9, 2025
 
 
 
/s/ Martha A. Tirinnanzi
 
Martha A. Tirinnanzi