# EDGAR Filing Document

**Accession Number:** 0000831114
**File Stem:** 0001398344-26-004872
**Filing Date:** 2026-3
**Character Count:** 16055
**Document Hash:** d4333d2798d0c65e69557c873b7af25a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-26-004872.hdr.sgml**: 20260309

**ACCESSION NUMBER**: 0001398344-26-004872

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 18

**FILED AS OF DATE**: 20260309

**DATE AS OF CHANGE**: 20260309

**EFFECTIVENESS DATE**: 20260309

**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:** 26734024

**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

### SGI Peak Fund (Series ID: S000068715)

---

|  |  |  |
|:---|:---|:---|
| Class Name     | Ticker Symbol | Class ID   |
| Class I Shares | SGPKX         | C000219685 |

---

### SGI Prudent Fund (Series ID: S000068716)

---

|  |  |  |
|:---|:---|:---|
| Class Name     | Ticker Symbol | Class ID   |
| Class I Shares | SGPGX         | C000219686 |

---

### SGI Enhanced Core ETF (Series ID: S000084010)

---

|  |  |  |
|:---|:---|:---|
| Class Name            | Ticker Symbol | Class ID   |
| SGI Enhanced Core ETF | USDX          | C000248136 |

---

### SGI Enhanced Global Income ETF (Series ID: S000084011)

---

|  |  |  |
|:---|:---|:---|
| Class Name                     | Ticker Symbol | Class ID   |
| SGI Enhanced Global Income ETF | GINX          | C000248137 |

---

## Series and Classes Contracts Data

### SGI Peak Fund (Series ID: S000068715)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000219685 | Class I Shares | SGPKX           |

### SGI Prudent Fund (Series ID: S000068716)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000219686 | Class I Shares | SGPGX           |

### SGI Enhanced Core ETF (Series ID: S000084010)

| Class ID   | Class Name            | Ticker Symbol   |
|:---|:---|:---|
| C000248136 | SGI Enhanced Core ETF | USDX            |

### SGI Enhanced Global Income ETF (Series ID: S000084011)

| Class ID   | Class Name                     | Ticker Symbol   |
|:---|:---|:---|
| C000248137 | SGI Enhanced Global Income ETF | GINX            |

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

**THE RBB FUND, INC.**

**SGI Enhanced Global Income ETF**

**(Ticker: NASDAQ – GINX)**

**SGI Enhanced Core ETF**

**(Ticker: NASDAQ – USDX)**

**______________________________________________________________________**

**Supplement dated March 9, 2026**

**to the Prospectus dated December 31, 2025**

**______________________________________________________________________**

1. The "Fees and Expenses" table and "Example"
in the section entitled "SUMMARY SECTION – SGI Enhanced Global Income 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 Fund ("Shares"). **This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.**

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** |  |
| Management Fees | 0.98% |
| Distribution (12b-1) Fees | 0.00% |
| Other Expenses | 0.00% |
| Acquired Fund Fees and Expenses<sup>(1)</sup> | 0.04% |
| Total Annual Fund Operating Expenses | 1.02% |

---

 

<sup>(1)</sup> Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the "Financial Highlights" section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.

*Example*

 

This Example is intended to help you compare the cost of investing in the 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** | **5 Years** | **10 Years** |
| $104 | $325 | $563 | $1248 |

---

&nbsp;&nbsp;&nbsp;&nbsp;2. The "Fees and Expenses" table and "Example" in the section entitled "SUMMARY
 SECTION – SGI Enhanced Core 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 Fund ("Shares"). **This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.**

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):** |  |
| Management Fees | 0.98% |
| Distribution (12b-1) Fees | 0.00% |
| Other Expenses | 0.00% |
| Acquired Fund Fees and Expenses<sup>(1)</sup> | 0.10% |
| Total Annual Fund Operating Expenses | 1.08% |

---

 

<sup>(1)</sup> Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the "Financial Highlights" section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses.

*Example*

 

This Example is intended to help you compare the cost of investing in the 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** | **5 Years** | **10 Years** |
| $110 | $343 | $595 | $1317 |

---

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

**Investors should retain this supplement for future reference.**

**THE RBB FUND, INC.**

**SGI Peak Fund**

**Class I Shares (Ticker: SGPKX)**

**SGI Prudent Fund**

**Class I Shares (Ticker: SGPGX)**

**(the "Funds")**

**______________________________________________________________________**

**Supplement dated March 9, 2026**

**to the Prospectus dated December 31, 2025**

**______________________________________________________________________**

&nbsp;&nbsp;&nbsp;&nbsp;1. The "Fees and Expenses" table and "Example" in the section entitled "SUMMARY
 SECTION – SGI Peak Fund" of the Prospectus are hereby deleted and replaced with the following:

**Expenses and Fees**

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. **Additionally, you may be required to pay commissions and/or other forms of compensation to an intermediary for transactions in the Fund, which are not reflected in the table or the example below.**

---

| | |
|:---|:---|
|  | **Class I** |
| **Shareholder Fees (fees paid directly from your investment)** |  |
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)  | None |
| Maximum Deferred Sales Charge (Load)  | None |
| Maximum Sales Charge (Load) Imposed on Reinvested Dividends  | None |
| Redemption Fee (as a percentage of amount redeemed, if applicable)  | None |

---

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)**  |  |
| Management Fees  | 0.75% |
| Distribution and/or Service (12b-1) Fees  |  |
| Other Expenses  | 0.41% |
| Acquired Fund Fees and Expenses<sup>(1)</sup>  | 0.78% |
| Fee Recoupment<sup>(2)</sup> | 0.01% |
| Total Annual Fund Operating Expenses  | 1.95% |

---

<sup>(1)</sup> Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the "Financial Highlights" section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses. 

<sup>(2)</sup> Summit Global Investments, LLC (the "Adviser"), the Fund's investment adviser, has contractually agreed to waive management fees and reimburse expenses through December 31, 2026 to the extent that Total Annual Fund Operating Expenses (excluding certain items discussed below) exceed 1.95% of the average daily net assets attributable to the Fund's Class I Shares. In determining the Adviser's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account: fund services administrative fee, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation may not be terminated before December 31, 2026 without the approval of the Board of Directors of the Company. If at any time the Fund's Total Annual Fund Operating Expenses (not including fund services administrative fee, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes) for a year are less than 1.95% of the average daily net assets attributable to the Fund's Class I Shares, the Adviser is entitled to reimbursement by the Fund of the advisory fees forgone and other payments remitted by the Adviser to the Fund within three years from the date on which such waiver or reimbursement was made, provided such reimbursement does not cause the Fund to exceed expense limitations that were in effect at the time of the waiver or reimbursement. 

**Example**

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in Class I Shares of 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 your investment has a 5% return each year and that 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** | **5 Years** | **10 Years** |
| Class I Shares | $198 | $612 | $1052 | $2275 |

---

&nbsp;&nbsp;&nbsp;&nbsp;2. The "Fees and Expenses" table and "Example" in the section entitled "SUMMARY
 SECTION – SGI Prudent Fund" of the Prospectus are hereby deleted and replaced with the following:

**Expenses and Fees**

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. **Additionally, you may be required to pay commissions and/or other forms of compensation to an intermediary for transactions in the Fund, which are not reflected in the table or the example below.**

---

| | |
|:---|:---|
|  | **Class I** |
| **Shareholder Fees (fees paid directly from your investment)** |  |
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)  | None |
| Maximum Deferred Sales Charge (Load)  | None |
| Maximum Sales Charge (Load) Imposed on Reinvested Dividends  | None |
| Redemption Fee (as a percentage of amount redeemed, if applicable)  | None |

---

---

| | |
|:---|:---|
| **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)** |  |
| Management Fees  | 0.75% |
| Distribution and/or Service (12b-1) Fees  |  |
| Other Expenses  | 0.41% |
| Acquired Fund Fees and Expenses<sup>(1)</sup>  | 0.82% |
| Total Annual Fund Operating Expenses  | 1.98% |
| Less Fee Waivers and/or Expense Reimbursements<sup>(2)</sup>  | -0.03% |
| Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements  | 1.95% |

---

<sup>(1)</sup> Acquired Fund Fees and Expenses are indirect fees and expenses that the Fund incurs from investing in the shares of other mutual funds, including money market funds and exchange traded funds. Please note that the amount of Total Annual Fund Operating Expenses shown in the above table will differ from the "Financial Highlights" section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as Acquired Fund Fees and Expenses. Acquired Fund Fees and Expenses have been restated for the current fiscal year. 

<sup>(2)</sup> Summit Global Investments, LLC (the "Adviser"), the Fund's investment adviser, has contractually agreed to waive management fees and reimburse expenses through December 31, 2026 to the extent that Total Annual Fund Operating Expenses (excluding certain items discussed below) exceed 1.95% of the average daily net assets attributable to the Fund's Class I Shares. In determining the Adviser's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account: fund services administrative fee, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation may not be terminated before December 31, 2026 without the approval of the Board of Directors of the Company. If at any time the Fund's Total Annual Fund Operating Expenses (not including fund services administrative fee, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes) for a year are less than 1.95% of the average daily net assets attributable to the Fund's Class I Shares, the Adviser is entitled to reimbursement by the Fund of the advisory fees forgone and other payments remitted by the Adviser to the Fund within three years from the date on which such waiver or reimbursement was made, provided such reimbursement does not cause the Fund to exceed expense limitations that were in effect at the time of the waiver or reimbursement. 

 

**Example**

 

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in Class I Shares of 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 your investment has a 5% return each year and that the Fund's operating expenses remain the same (taking into account the term of the expense limitation agreement). Although your actual costs may be higher or lower, based on these assumptions your costs would be:

 

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **1 Year** | **3 Years** | **5 Years** | **10 Years** |
| Class I Shares | $198 | $618 | $1065 | $2304 |

---

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

**Investors should retain this supplement for future reference.**