# EDGAR Filing Document

**Accession Number:** 0000831114
**File Stem:** 0001398344-25-018085
**Filing Date:** 2025-9
**Character Count:** 4419
**Document Hash:** 2d48b3d343d89e9549215ba1f0484ac5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-25-018085.hdr.sgml**: 20250912

**ACCESSION NUMBER**: 0001398344-25-018085

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 17

**FILED AS OF DATE**: 20250912

**DATE AS OF CHANGE**: 20250912

**EFFECTIVENESS DATE**: 20250912

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** RBB FUND, INC.
- **CENTRAL INDEX KEY:** 0000831114

**ORGANIZATION NAME:**
- **EIN:** 510312196
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0831

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-20827
- **FILM NUMBER:** 251310391

**BUSINESS ADDRESS:**
- **STREET 1:** 615 E. MICHIGAN ST.
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202
- **BUSINESS PHONE:** 609-731-6256

**MAIL ADDRESS:**
- **STREET 1:** 615 E. MICHIGAN ST.
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** RBB FUND INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FUND INC /DE/
- **DATE OF NAME CHANGE:** 19600201

## Series and Classes Contracts Data

### F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF (Series ID: S000090461)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                                      | Ticker Symbol | Class ID   |
| F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF | RBIL          | C000257706 |

---

## Series and Classes Contracts Data

### F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF (Series ID: S000090461)

| Class ID   | Class Name                                                      | Ticker Symbol   |
|:---|:---|:---|
| C000257706 | F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF | RBIL            |

?xml version='1.0' encoding='ASCII'?

**THE RBB FUND, INC.**

**F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF**

**(Ticker: RBIL)**

**Supplement dated September 12, 2025**

**to the Prospectus and Statement of Additional Information ("SAI"), each dated February 14, 2025**

Effective as of September 15, 2025, F/m Investments LLC, the investment adviser to the F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF (the "Fund"), has contractually agreed to lower its unitary management fee to 0.17% of the Fund's average daily net assets. Prior to September 15, 2025, the Fund's unitary management fee was 0.25%. All references in the Fund's Prospectus and SAI are revised accordingly.

In addition, the "Fees and Expenses" table and "Example" in the section entitled "Summary Section F/m Ultrashort Treasury Inflation-Protected Security (TIPS) ETF" of the Prospectus are hereby deleted and replaced with the following:

**Fees and Expenses** 

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the F/m Ultrashort TIPS Fund ("Shares"). **You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below**.

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment)  | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the value of your investment)  |
| Management Fees<sup>(1)</sup> | 0.17% |
| Distribution (12b-1) Fees |  |
| Other Expenses<sup>(2)</sup> |  |
| Total Annual Fund Operating Expenses | 0.17% |

---

&nbsp;&nbsp;&nbsp;&nbsp;(1) Prior to September 15, 2025, the unitary management fee was 0.25%.

&nbsp;&nbsp;&nbsp;&nbsp;(2) "Other Expenses" have
been estimated to reflect expenses to be incurred during the current fiscal year.

**Example**

This Example is intended to help you compare the cost of investing in the F/m Ultrashort TIPS Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your Shares at the end of those periods. The Example also assumes that: (1) your investment has a 5% return each year, and (2) the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

---

| | |
|:---|:---|
| 1 Year | 3 Years |
| $17 | $55 |

---

**\* \* \* \* \***

**Please retain this supplement for your reference.**