# EDGAR Filing Document

**Accession Number:** 0000067160
**File Stem:** 0001133228-25-012226
**Filing Date:** 2025-11
**Character Count:** 4579
**Document Hash:** bd5bf224cbbb74be246e38e75566f34a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001133228-25-012226.hdr.sgml**: 20251114

**ACCESSION NUMBER**: 0001133228-25-012226

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251114

**DATE AS OF CHANGE**: 20251114

**EFFECTIVENESS DATE**: 20251114

**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:** 251488288

**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 Fundamental Equity Fund (Series ID: S000034946)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000107475 | Class II        |  |
| C000107476 | Service Class I |  |

#### MML SERIES INVESTMENT FUND<br>

#### MML Fundamental Equity Fund<br>

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

#### Supplement dated November 14, 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.

*The following information replaces similar information for the Fund found under the headings **Annual Fund Operating Expenses** and **Example** in the section titled **Fees and Expenses of the Fund** (on page 27 of the Prospectus):* 

#### Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

---

| | | |
|:---|:---|:---|
|  | **Class II** | **Service Class I**  |
| Management Fees | 0.60% | &nbsp;&nbsp;&nbsp;&nbsp;0.60%  |
| Distribution and Service (Rule 12b-1) Fees |  | &nbsp;&nbsp;&nbsp;&nbsp;0.25%  |
| Other Expenses | 0.21% | &nbsp;&nbsp;&nbsp;&nbsp;0.21%  |
| **Total Annual Fund Operating Expenses** | **0.81%** | &nbsp;&nbsp;&nbsp;&nbsp;**1.06%**  |
| Expense Reimbursement | (0.01%) | &nbsp;&nbsp;&nbsp;&nbsp;(0.01%)  |
| Total Annual Fund Operating Expenses after Expense Reimbursement<sup>(1)</sup> | 0.80% | &nbsp;&nbsp;&nbsp;&nbsp;1.05% |

---

(1) MML Advisers has agreed to cap the fees and expenses of the Fund (other than extraordinary legal and other expenses, Acquired Fund Fees and Expenses, interest expense, expenses related to borrowings, securities lending, leverage, taxes, and brokerage, short sale dividend and loan expense, or other non-recurring or unusual expenses such as organizational expenses and shareholder meeting expenses, as applicable) through April 30, 2028, to the extent that Total Annual Fund Operating Expenses after Expense Reimbursement would otherwise exceed 0.80% and 1.05% for Class II and Service Class I shares, respectively. The agreement can only be terminated by mutual consent of the Board of Trustees on behalf of the Fund and MML Advisers. 

#### 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. It assumes that you invest $10,000 in each share class of the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment earns a 5% return each year and that the Fund's operating expenses are exactly as described in the preceding table. If separate account or variable life insurance or variable annuity contract expenses were included, overall expenses would be higher. 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**  |
| &nbsp;&nbsp;Class II | &nbsp;&nbsp;$82 | $256 | $447 | &nbsp;&nbsp;$999  |
| Service Class I  | $107 | $335 | $582 | $1292 |

---

#### PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

#### MMLPRO-25-08<br>

#### FG-25-01