# EDGAR Filing Document

**Accession Number:** 0000067160
**File Stem:** 0001133228-25-006047
**Filing Date:** 2025-6
**Character Count:** 3292
**Document Hash:** 45890402dedfdfe500a308439e4ebd62
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001133228-25-006047.hdr.sgml**: 20250604

**ACCESSION NUMBER**: 0001133228-25-006047

**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:** MML SERIES INVESTMENT FUND
- **CENTRAL INDEX KEY:** 0000067160

**ORGANIZATION NAME:**
- **EIN:** 042476032
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-39334
- **FILM NUMBER:** 251023247

**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:** MML EQUITY INVESTMENT CO INC
- **DATE OF NAME CHANGE:** 19850227

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MML INVESTMENT CO INC
- **DATE OF NAME CHANGE:** 19811109

## Series and Classes Contracts Data

### MML Mid Cap Value Fund (Series ID: S000011488)

| Class ID   | Class Name    | Ticker Symbol   |
|:---|:---|:---|
| C000031718 | Initial Class |  |
| C000067776 | Service Class |  |

**MML SERIES INVESTMENT FUND** 

<br> #### MML Mid Cap Value Fund<br>

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

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

#### Prospectus dated April 25, 2025 and the<br>

#### Summary Prospectus dated April 25, 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 similar information for **Michael Liss** of **American Century Investment Management, Inc.** found under the heading **Portfolio Manager(s)** in the section titled **Management** (page 64 of the Prospectus):* 

**Michael Liss, CFA is a Vice President and Senior Portfolio Manager at American Century. He has managed the Fund since its inception (May 2006). He is expected to step down as a portfolio manager of the Fund on December 31, 2025.** 

*Effective immediately, the following information replaces similar information for **Michael Liss** found under **American Century Investment Management, Inc.** under the heading **Subadvisers and Portfolio Managers** in the section titled **Management of the Funds** on page 119 of the Prospectus:* 

#### Michael Liss, CFA ______________________________________________________________________________________ <br>
**is a portfolio manager of the *MML Mid Cap Value Fund,* which is managed on a team basis. He is jointly and primarily responsible for the day-to-day management of the Fund. Mr. Liss is a Vice President and Senior Portfolio Manager for American Century. Mr. Liss joined American Century in 1998 and became a portfolio manager in 2004. He is expected to step down as a portfolio manager of the Fund on December 31, 2025.** 

#### PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

#### MMLPRO-25-02<br>

#### MMLMCV-25-01