# EDGAR Filing Document

**Accession Number:** 0000798244
**File Stem:** 0001104659-23-040174
**Filing Date:** 2023-3
**Character Count:** 7851
**Document Hash:** 7e325e5ddedfdcd77f63723b097e10ad
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-23-040174.hdr.sgml**: 20230331

**ACCESSION NUMBER**: 0001104659-23-040174

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 19

**FILED AS OF DATE**: 20230331

**DATE AS OF CHANGE**: 20230331

**EFFECTIVENESS DATE**: 20230331

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST I
- **CENTRAL INDEX KEY:** 0000798244
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-07638
- **FILM NUMBER:** 23787728

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 18006372929

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 21ST FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS SERIES TRUST I /MA/
- **DATE OF NAME CHANGE:** 19940427

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MFS LIFETIME MANAGED SECTORS FUND
- **DATE OF NAME CHANGE:** 19930408

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LIFETIME MANAGED SECTORS TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### MFS Low Volatility Global Equity Fund (Series ID: S000042702)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| A          | MVGAX         | C000132022 |
| B          | MVGBX         | C000132023 |
| C          | MVGCX         | C000132024 |
| I          | MVGIX         | C000132025 |
| R1         | MVGJX         | C000132026 |
| R2         | MVGKX         | C000132027 |
| R3         | MVGLX         | C000132028 |
| R4         | MVGMX         | C000132029 |
| R6         | MVGNX         | C000132030 |

---

## Series and Classes Contracts Data

### MFS Low Volatility Global Equity Fund (Series ID: S000042702)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000132022 | A            | MVGAX           |
| C000132023 | B            | MVGBX           |
| C000132024 | C            | MVGCX           |
| C000132025 | I            | MVGIX           |
| C000132026 | R1           | MVGJX           |
| C000132027 | R2           | MVGKX           |
| C000132028 | R3           | MVGLX           |
| C000132029 | R4           | MVGMX           |
| C000132030 | R6           | MVGNX           |

?xml version="1.0" encoding="ASCII"?

---

| | |
|:---|:---|
| SUPPLEMENT TO THE PROSPECTUS<br> *Supplement dated April 1, 2023, to the Prospectus dated December 29, 2022.* | ![](tm2310402d1_497img004.jpg) |

---

MFS<sup>®</sup> Low Volatility Global Equity Fund

 

**Effective immediately, the section entitled "Performance Information" under the main heading entitled "Summary of Key Information" is restated in its entirety as follows:**

**Performance Information**

The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing changes in the fund's performance over time and how the fund's performance over time compares with that of a broad measure of market performance and one or more other measures of performance for markets in which the fund may invest.

The fund's past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. Updated performance is available online at **mfs.com** or by calling 1-800-225-2606.

**Class A Bar Chart.** The bar chart does not take into account any sales charges (loads) that you may be required to pay upon purchase or redemption of the fund's shares. If these sales charges were included, they would reduce the returns shown.

![](tm2310402d1_497img002.jpg)

During the period(s) shown in the bar chart, the highest quarterly return was 11.25% (for the calendar quarter ended June 30, 2020) and the lowest quarterly return was (18.01)% (for the calendar quarter ended March 31, 2020).

**Performance Table.**

---

| |
|:---|
| **Average Annual Total Returns** |
| (For the Periods Ended December 31, 2022) |

---

---

| | | | |
|:---|:---|:---|:---|
| **Share Class** | **1 YEAR** | **5 YEARS** | **LIFE<br> (INCEPTION<br> 12-5-2013)** |
| **Returns Before Taxes** |  |  |  |
| **B Shares** | (12.59)% | 4.51% | 6.35% |
| **C Shares** | (9.94)% | 4.87% | 6.35% |
| **I Shares** | (8.17)% | 5.90% | 7.33% |
| **R1 Shares** | (9.09)% | 4.84% | 6.26% |
| **R2 Shares** | (8.59)% | 5.37% | 6.80% |
| **R3 Shares** | (8.34)% | 5.65% | 7.07% |
| **R4 Shares** | (8.11)% | 5.91% | 7.33% |
| **R6 Shares** | (8.04)% | 6.00% | 7.39% |
| **A Shares** | (13.68)% | 4.40% | 6.39% |
| **Returns After Taxes on Distributions** |  |  |  |
| A Shares | (14.43)% | 3.46% | 5.70% |
| **Returns After Taxes on Distributions and Sale of Fund Shares** |  |  |  |
| A Shares | (7.48)% | 3.47% | 5.12% |
| **Index Comparisons (Reflects no deduction for fees, expenses, or taxes)** |  |  |  |
| MSCI All Country World Index (net div) | (18.36)% | 5.23% | 6.77% |
| MSCI All Country World Minimum Volatility Index (net div) | (10.31)% | 4.57% | 6.88% |

---

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. The after-tax returns are shown for only one of the fund's classes of shares, and after-tax returns for the fund's other classes of shares will vary from the returns shown.

LVO-SUP-I-040123

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