# EDGAR Filing Document

**Accession Number:** 0000798244
**File Stem:** 0000912938-25-000253
**Filing Date:** 2025-12
**Character Count:** 6510
**Document Hash:** 7183c209a90a000c5b453453a2b85d78
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000912938-25-000253.hdr.sgml**: 20251204

**ACCESSION NUMBER**: 0000912938-25-000253

**CONFORMED SUBMISSION TYPE**: 485BXT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251204

**DATE AS OF CHANGE**: 20251204

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST I
- **CENTRAL INDEX KEY:** 0000798244

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 485BXT
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-04777
- **FILM NUMBER:** 251549049

**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
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS SERIES TRUST I
- **CENTRAL INDEX KEY:** 0000798244

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 485BXT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-07638
- **FILM NUMBER:** 251549048

**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 Value Fund (Series ID: S000000769)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000002259 | A            | MEIAX           |
| C000002260 | R4           | MEIJX           |
| C000002264 | B            | MFEBX           |
| C000002265 | C            | MEICX           |
| C000002266 | I            | MEIIX           |
| C000002268 | R1           | MEIGX           |
| C000002270 | R2           | MVRRX           |
| C000002271 | R3           | MEIHX           |
| C000033014 | R6           | MEIKX           |

#### As filed with the Securities and Exchange Commission on December 4, 2025
1933 Act File No. 33-7638

1940 Act File No. 811-4777

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________

FORM N-1A

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

PRE-EFFECTIVE AMENDMENT NO.

POST-EFFECTIVE AMENDMENT NO. 93

AND

REGISTRATION STATEMENT

UNDER THE INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 95

## MFS <sup>®</sup> SERIES TRUST I
(Exact Name of Registrant as Specified in Charter)

111 Huntington Avenue, Boston, Massachusetts 02199

(Address of Principal Executive Offices)

Registrant's Telephone Number, including Area Code: 617-954-5000

Christopher R. Bohane, Massachusetts Financial Services Company,

111 Huntington Avenue, Boston, Massachusetts 02199

(Name and Address of Agent for Service)

#### APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
As soon as practicable after the effective date of the registration statement.

The sole purpose of this Post-Effective Amendment No. 93, filed pursuant to Rule 485(b) under the Securities Act of 1933, as amended, is to delay the effectiveness of the Registration Statement No. 92 on Form N-1A (File No. 33-7638) (the "Registration Statement") until December 29, 2025.

Parts A, B, and C are incorporated by reference to the Registrant's Registration Statement filed with the Securities and Exchange Commission on October 8, 2025.

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#### SIGNATURES
Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment to the Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of Boston and The Commonwealth of Massachusetts on December 4, 2025.

#### MFS <sup>®</sup> SERIES TRUST I
By: <u>/s/DAVID L. DILORENZO\*</u>

Name: David L. DiLorenzo

Title: President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to its Registration Statement has been signed below by the following persons in the capacities indicated on December 4, 2025.

**<u>SIGNATURE</u> <u>TITLE</u>**

<u>/s/DAVID L. DILORENZO\*</u> President (Principal Executive Officer)

David L. DiLorenzo

<u>/s/KASEY L. PHILLIPS\*</u> Principal Financial and Accounting Officer

Kasey L. Phillips

<u>/s/STEVEN E. BULLER\*</u> Trustee

Steven E. Buller

<u>/s/JOHN A. CAROSELLI\*</u> Trustee

John A. Caroselli

<u>/s/MAUREEN R. GOLDFARB\*</u> Trustee

Maureen R. Goldfarb

<u>/s/PETER D. JONES\*</u> Trustee

Peter D. Jones

<u>/s/JOHN P. KAVANAUGH\*</u> Trustee

John P. Kavanaugh

<u>/s/JAMES W. KILMAN, JR.\*</u> Trustee

James W. Kilman, Jr.

<u>/s/CLARENCE OTIS, JR.\*</u> Trustee

Clarence Otis, Jr.

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<u>/s/MICHAEL W. ROBERGE\*</u> Trustee

Michael W. Roberge

<u>/s/MARYANNE L. ROEPKE\*</u> Trustee

Maryanne L. Roepke

<u>/s/PAULA E. SMITH\*</u> Trustee

Paula E. Smith

<u>/s/LAURIE J. THOMSEN\*</u> Trustee

Laurie J. Thomsen

<u>/s/DARRELL A. WILLIAMS\*</u> Trustee

Darrell A. Williams

\*By: <u>/s/CHRISTOPHER R. BOHANE</u>

Name: Christopher R. Bohane

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;as Attorney-in-fact

Executed by Christopher R. Bohane on behalf of those indicated pursuant to a Power of Attorney, dated January 1, 2025 (Trustees) and a Power of Attorney, dated January 1, 2025 (DiLorenzo) (Phillips); filed herewith.

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