# EDGAR Filing Document

**Accession Number:** 0000831114
**File Stem:** 0001398344-25-018873
**Filing Date:** 2025-10
**Character Count:** 12466
**Document Hash:** 822a5d68c3a87860ee3bde7661411135
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-25-018873.hdr.sgml**: 20251006

**ACCESSION NUMBER**: 0001398344-25-018873

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 20

**FILED AS OF DATE**: 20251006

**DATE AS OF CHANGE**: 20251006

**EFFECTIVENESS DATE**: 20251006

**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:** 251375688

**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

### ABBEY CAPITAL MULTI ASSET FUND (Series ID: S000061608)

---

|  |  |  |
|:---|:---|:---|
| Class Name     | Ticker Symbol | Class ID   |
| CLASS A SHARES | MAFAX         | C000199559 |
| CLASS C SHARES | MAFCX         | C000199560 |
| CLASS I SHARES | MAFIX         | C000199561 |

---

## Series and Classes Contracts Data

### ABBEY CAPITAL MULTI ASSET FUND (Series ID: S000061608)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000199559 | CLASS A SHARES | MAFAX           |
| C000199560 | CLASS C SHARES | MAFCX           |
| C000199561 | CLASS I SHARES | MAFIX           |

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

**The RBB Fund, Inc.**

**Abbey Capital Multi Asset Fund (the "Fund")**

Class I Shares (Ticker: MAFIX)

Class A Shares (Ticker: MAFAX)

Class C Shares (Ticker: MAFCX)

**_____________________________________________________________________**

**Supplement dated October 6, 2025**

**to the Fund's Prospectus dated December 31, 2024, as supplemented**

**______________________________________________________________________**

*THIS SUPPLEMENT PROVIDES NEW AND ADDITIONAL INFORMATION BEYOND THAT CONTAINED IN THE PROSPECTUS AND SHOULD BE READ IN CONJUNCTION WITH THE PROSPECTUS.*

Effective as of October 6, 2025, the Fund will invest in one or more exchange-traded funds ("ETFs") as part of its "Long U.S. Equity" strategy. Accordingly, the following sections of the Prospectus are revised:

&nbsp;&nbsp;&nbsp;&nbsp;1. The section entitled "Summary Section – Expenses and Fees" is amended and restated in
its entirety as shown below:

**EXPENSES AND FEES**

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (the "Shares"). You may qualify for sales charge discounts if you invest, or agree to invest in the future, at least $25,000 in Class A Shares of the Fund. More information about these and other discounts is available from your financial professional, in the section of this Prospectus entitled "Shareholder Information – Sales Charges" and in the section of the Fund's Statement of Additional Information ("SAI") entitled "Purchase and Redemption Information – Reducing or Eliminating the Front-End Sales Charge." **Financial intermediaries may impose different sales charge waivers for Class A Shares, and these variations are described in Appendix A of this Prospectus.** Additionally, you may be required to pay commissions and/or other forms of compensation to a broker for transactions in Class I Shares of the Fund, which are not reflected in the tables or the examples below.

---

| | | | |
|:---|:---|:---|:---|
|  | CLASS I | CLASS A | CLASS C |
| **Shareholder Fees** (fees paid directly from your investment) |  |  |  |
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |  | 5.75% |  |
| Maximum Deferred Sales Charge (Load) |  | None<sup>(1)</sup> | 1.00%<sup>(2)</sup> |
| Maximum Sales Charge (Load) Imposed on Reinvested Dividends |  |  |  |
| Redemption Fee (as a percentage of amount redeemed, if applicable) |  |  |  |

---

---

| | | | |
|:---|:---|:---|:---|
| **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) | **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>(3)</sup> | 1.77% | 1.77% | 1.77% |
| Distribution and/or Service (12b-1) Fees |  | 0.25% | 1.00% |
| Other Expenses | 0.10% | 0.10% | 0.10% |
| Acquired Fund Fees and Expenses<sup>(4)</sup> | 0.01% | 0.01% | 0.01% |
| Total Annual Fund Operating Expenses<sup>(5)</sup> | 1.88% | 2.13% | 2.88% |
| Fee Waivers and/or Expense Reimbursements<sup>(6)</sup> | -0.08% | -0.08% | -0.08% |
| Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements<sup>(5)</sup> | 1.80% | 2.05% | 2.80% |

---

<sup>(1)</sup> A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Class A Shares made within 12 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

<sup>(2)</sup> The CDSC applies to redemptions of Class C Shares made within 12 months of purchase and will be assessed on an amount equal to the lesser of the offering price at the time of purchase of the shares redeemed and the net asset value of the shares redeemed at the time of redemption.

<sup>(3)</sup> Management Fees include advisory fees paid to both Abbey Capital Limited (the "Adviser") and one or more trading advisers (the "Trading Advisers"). **There are no performance fees charged by the Adviser or Trading Advisers either at the Fund or at the Fund's wholly-owned Subsidiaries.**

<sup>(4)</sup> Acquired Fund Fees and Expenses ("AFFE") 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. AFFE are estimated for the current fiscal year.

<sup>(5)</sup> Total Annual Fund Operating Expenses and Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements 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 AFFE. Without AFFE, the Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements would be 1.79%, 2.04% and 2.79% of the Fund's average daily net assets attributable to Class I Shares, Class A Shares and Class C Shares, respectively.

<sup>(6)</sup> The Adviser has contractually agreed to waive its advisory fee and/or reimburse expenses in order to limit Total Annual Fund Operating Expenses (excluding certain items discussed below) to 1.79%, 2.04% and 2.79% of the Fund's average daily net assets attributable to Class I Shares, Class A Shares and Class C Shares, respectively. In determining the Adviser's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account and could cause net Total Annual Fund Operating Expenses to exceed 1.79%, 2.04% or 2.79%, as applicable: AFFE, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until December 31, 2025 for Class I Shares, Class A Shares and Class C Shares, and may not be terminated prior to that date without the approval of the Board of Directors of The RBB Fund, Inc. (the "Company"). If at any time the Fund's Total Annual Fund Operating Expenses (not including AFFE, brokerage commissions, extraordinary items, interest or taxes) for a year are less than 1.79%, 2.04% and 2.79%, as applicable, the Adviser may recoup any waived or reimbursed amounts from the Fund within three years from the date on which such waiver or reimbursement was made by the Adviser, 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 A or Class C Shares, or $1,000,000 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 contractual expense limitation until its expiration). Although your actual costs may be higher or lower, based on these assumptions your costs of investing in the Fund would be:

---

| | | | | |
|:---|:---|:---|:---|:---|
| | **1 YEAR** | **3 YEARS** | **5 YEARS** | **10 YEARS** |
| Class I Shares | $18288 | $58311 | $100871 | $219447 |
| Class A Shares | $771 | $1196 | $1646 | $2890 |
| Class C Shares | $383 | $884 | $1511 | $3199 |

---

You would pay the following expenses on Class C Shares if you did not redeem your shares at the end of the period:

---

| | | | | |
|:---|:---|:---|:---|:---|
| | **1 YEAR** | **3 YEARS** | **5 YEARS** | **10 YEARS** |
| Class C Shares | $283 | $884 | $1511 | $3199 |

---

&nbsp;&nbsp;&nbsp;&nbsp;2. The fourth paragraph of the section entitled "Summary Section – Principal Investment Strategies"
is amended and restated in its entirety as shown below:

The Long U.S. Equity strategy will be achieved by the Adviser targeting an allocation of approximately 50% of the Fund's total assets in a portfolio of one or more U.S. equity index futures (the "Equity Portfolio") and/or one or more ETFs (as defined below). The Adviser will monitor the percentage of the Fund's total assets that form the Equity Portfolio on a daily basis. The Adviser will establish 'rebalancing thresholds' so that if at any time the percentage of the Fund's total assets invested in the Equity Portfolio is above or below the target allocation of approximately 50% by a specific amount, then the Adviser will seek to rebalance the Equity Portfolio back towards its target allocation of approximately 50%. Such rebalancing thresholds will be determined by the Adviser and may be subject to change from time to time.

&nbsp;&nbsp;&nbsp;&nbsp;3. The section entitled "Summary Section – Principal Investment Risks" is amended by adding
the following risk factor:

**Other Investment Companies Risk.** To the extent the Fund invests in other investment companies, including money market funds and ETFs, its performance will be affected by the performance of those other investment companies. Investments in other investment companies are subject to the risks of the other investment companies' investments, as well as to the other investment companies' expenses. In addition to risks generally associated with investments in investment company securities, ETFs are subject to the following risks that do not apply to traditional mutual funds: (i) an ETF's shares may trade at a market price that is above or below their net asset value ("NAV"); (ii) an active trading market for an ETF's shares may not develop or be maintained; (iii) the ETF may employ an investment strategy that utilizes high leverage ratios; or (iv) trading of an ETF's shares may be halted if the listing exchange's officials deem such action appropriate, the shares are de-listed from the exchange, or the activation of market-wide "circuit breakers" (which are tied to large decreases in stock prices) halts stock trading generally. Certain ETFs may be thinly traded and experience large spreads between the "ask" price quoted by a seller and the "bid" price offered by a buyer. The existence of extreme market volatility or potential lack of an active trading market for an ETF's shares could result in such shares trading at a significant premium or discount to their NAV.

If you have any questions, please call the Fund at 1-844-261-6484.

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