# EDGAR Filing Document

**Accession Number:** 0000846800
**File Stem:** 0000030146-25-000123
**Filing Date:** 2025-11
**Character Count:** 5518
**Document Hash:** 5e28c793f1f55c9ed3e71dac41102bfb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000030146-25-000123.hdr.sgml**: 20251114

**ACCESSION NUMBER**: 0000030146-25-000123

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 19

**FILED AS OF DATE**: 20251114

**DATE AS OF CHANGE**: 20251114

**EFFECTIVENESS DATE**: 20251114

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BNY MELLON STOCK INDEX FUND, INC.
- **CENTRAL INDEX KEY:** 0000846800

**ORGANIZATION NAME:**
- **EIN:** 133537664
- **STATE OF INCORPORATION:** NY
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-27172
- **FILM NUMBER:** 251483244

**BUSINESS ADDRESS:**
- **STREET 1:** C/O BNY MELLON INVESTMENT ADVISER, INC.
- **STREET 2:** 240 GREENWICH STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10286
- **BUSINESS PHONE:** 2129226400

**MAIL ADDRESS:**
- **STREET 1:** C/O BNY MELLON INVESTMENT ADVISER, INC.
- **STREET 2:** 240 GREENWICH STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10286

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DREYFUS STOCK INDEX FUND, INC.
- **DATE OF NAME CHANGE:** 20181030

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DREYFUS STOCK INDEX FUND INC
- **DATE OF NAME CHANGE:** 20020514

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DREYFUS LIFE & ANNUITY INDEX FUND INC
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### BNY Mellon Stock Index Fund, Inc. (Series ID: S000001911)

---

|  |  |
|:---|:---|
| Class Name                                         | Class ID   |
| BNY Mellon Stock Index Fund, Inc. - Initial Shares | C000005028 |
| BNY Mellon Stock Index Fund, Inc. - Service Shares | C000005029 |

---

## Series and Classes Contracts Data

### BNY Mellon Stock Index Fund, Inc. (Series ID: S000001911)

| Class ID   | Class Name                                         | Ticker Symbol   |
|:---|:---|:---|
| C000005028 | BNY Mellon Stock Index Fund, Inc. - Initial Shares |  |
| C000005029 | BNY Mellon Stock Index Fund, Inc. - Service Shares |  |

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

November 14, 2025

#### BNY MELLON STOCK INDEX FUND, INC.

#### Supplement to Current Summary Prospectus and Prospectus
**The following information supplements the information in the sections "Principal Investment Strategy" in the summary prospectus and "Fund Summary – Principal Investment Strategy" in the prospectus:**

The fund may operate as a non-diversified fund, as defined under the Investment Company Act of 1940, as amended, to the approximate extent the S&P 500<sup>®</sup> Index is non-diversified, without shareholder approval. The fund may therefore operate as non-diversified solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the index.

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#### The following information supplements the information in the sections "Principal Risks" in the summary prospectus and "Fund Summary – Principal Risks" in the prospectus:
&nbsp;&nbsp;&nbsp;&nbsp;● *Non-diversification risk.* Because the fund seeks to closely track the composition of the index, from time to time, more than 25% of the fund's total assets may be invested in issuers representing more than 5% of the fund's total assets due to an index rebalance or market movement, which would result in the fund being non-diversified under the Investment Company Act of 1940, as amended. A non-diversified fund may invest a greater portion of its assets in securities of a smaller number of individual issuers than a diversified fund. As a result, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund.

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

#### The following information supplements the information in the section "Fund Details – Goal and Approach" in the prospectus:
The fund may operate as a non-diversified fund, as defined under the Investment Company Act of 1940, as amended, to the approximate extent the S&P 500<sup>®</sup> Index is non-diversified, without shareholder approval. The fund may therefore operate as non-diversified solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the index. As a result, the fund may invest a significant percentage of its assets in a single issuer or small number of issuers.

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

**The following information supplements the information in the section "Fund Details – Investment Risks" in the prospectus:**

&nbsp;&nbsp;&nbsp;&nbsp;● *Non-diversification risk.* Because the fund seeks to closely track the composition of the index, from time to time, more than 25% of the fund's total assets may be invested in issuers representing more than 5% of the fund's total assets due to an index rebalance or market movement, which would result in the fund being non-diversified under the Investment Company Act of 1940, as amended. A non-diversified fund may invest a greater portion of its assets in securities of a smaller number of individual issuers than a diversified fund. As a result, the fund's

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performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund.

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

0763STK1125

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