# EDGAR Filing Document

**Accession Number:** 0000916053
**File Stem:** 0001133228-25-006051
**Filing Date:** 2025-6
**Character Count:** 3633
**Document Hash:** ab103eca27b6e98c72c36f2fa677a710
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001133228-25-006051.hdr.sgml**: 20250604

**ACCESSION NUMBER**: 0001133228-25-006051

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250604

**DATE AS OF CHANGE**: 20250604

**EFFECTIVENESS DATE**: 20250604

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MASSMUTUAL SELECT FUNDS
- **CENTRAL INDEX KEY:** 0000916053

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-73824
- **FILM NUMBER:** 251023331

**BUSINESS ADDRESS:**
- **STREET 1:** 1295 STATE STREET
- **CITY:** SPRINGFIELD
- **STATE:** MA
- **ZIP:** 01111
- **BUSINESS PHONE:** 413-744-1000

**MAIL ADDRESS:**
- **STREET 1:** 1295 STATE STREET
- **CITY:** SPRINGFIELD
- **STATE:** MA
- **ZIP:** 01111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MASSMUTUAL INSTITUTIONAL FUNDS
- **DATE OF NAME CHANGE:** 19931213

## Series and Classes Contracts Data

### MM S&P 500 Index Fund (Series ID: S000003661)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000010191 | Class R4             | MIEAX           |
| C000010193 | Class R3             | MMINX           |
| C000010194 | Service Class        | MMIEX           |
| C000010195 | Administrative Class | MIEYX           |
| C000010196 | Class R5             | MIEZX           |
| C000108421 | Class I              | MMIZX           |
| C000140354 | Class A              | MMFFX           |

**MASSMUTUAL FUNDS**

<br> #### MM S&P 500<sup>®</sup> Index Fund<br>

#### (the "Fund")<br>

#### Supplement dated June 4, 2025 to the <br>

#### Prospectus dated February 1, 2025 and the <br>

#### Summary Prospectus dated February 1, 2025
This supplement provides new and additional information beyond that contained in the Prospectus and Summary Prospectus, and any previous supplements. It should be retained and read in conjunction with the Prospectus and Summary Prospectus, and any previous supplements.

*Effective immediately, the following information replaces the information for **Paul Whitehead** found under the heading **Portfolio Manager(s)** in the section titled **Management (**page 20 of the Prospectus):* 

#### Peter Sietsema, CFA is a Director at BlackRock. He has managed the Fund since May 2025.
*Effective immediately, the following information replaces the information for **Paul Whitehead** found under **BlackRock Investment Management, LLC** under the heading **Subadvisers and Portfolio Managers** in the section titled **Management of the Funds** beginning on page 86 of the Prospectus:* 

**Peter Sietsema, CFA_________________________________________________________________________________ <br>is jointly and primarily responsible for the day-to-day management of the *S&P 500 Index Fund's* portfolio, including setting the Fund's overall investment strategy and overseeing the management of the Fund. Mr. Sietsema is a Director of BlackRock, Inc. and the U.S. Head of North American Portfolio Management for Index Equity Investments within BlackRock Global Markets & Index Investments. Mr. Sietsema's service with the firm dates back to 2007, including his years with Barclays Global Investors ("BGI"), which merged with BlackRock in 2009. At BGI, he was a portfolio manager within the U.S. Index Portfolio Management group in San Francsico. Mr. Sietsema began his career as Senior Manager of Alternative Investments at State Street.**

#### PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

#### SELMPRO-25-10<br>

#### SP500-25-03