Company: SPH
Filing Date: 2025-02-12
Form Type: S-3
Source: 0001193125-25-024546
Chunk: 3

Company: SUBURBAN PROPANE PARTNERS LP
Filing Date: 2025-02-12
Form: S-3
Chunk 3
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| Wells Fargo Securities |     | J.P. Morgan |     | BofA Securities |     | Evercore ISI |

The date of this prospectus is , 2025

TABLE OF CONTENTS

| ABOUT THIS PROSPECTUS                                    |     |   ii |
| PROSPECTUS SUMMARY                                       |     |    1 |
| THE OFFERING                                             |     |    3 |
| FORWARD-LOOKING                                          
 STATEMENTS                                               |     |    4 |
| RISK FACTORS                                             |     |    6 |
| USE OF PROCEEDS                                          |     |    7 |
| DESCRIPTION OF THE COMMON UNITS                          |     |    8 |
| MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES            |     |   10 |
| PLAN OF DISTRIBUTION                                     |     |   27 |
| LEGAL MATTERS                                            |     |   29 |
| EXPERTS                                                  |     |   30 |
| WHERE YOU CAN FIND MORE INFORMATION AND INCORPORATION BY 
 REFERENCE                                                |     |   31 |
| PART II. INFORMATION NOT REQUIRED IN PROSPECTUS          |     | II-1 |
| SIGNATURES                                               |     | II-5 |
| POWER OF ATTORNEY                                        |     | II-5 |

i

ABOUT THIS PROSPECTUS

This prospectus is part of a “shelf” registration statement on Form S-3 filed with the Securities and
Exchange Commission (the “SEC”). This prospectus relates only to an offering of up to $100.0 million of our common units through the Agents. These sales, if any, will be made pursuant to the terms of the equity distribution agreement
entered into among us and the Agents on February , 2025, a copy of which is filed as an exhibit to the registration statement of which this prospectus forms a part.

We urge you to carefully read this prospectus, the documents incorporated by reference herein the additional information in the section of this prospectus
entitled “Where You Can Find More Information and Incorporation by Reference” before investing in any of the securities being offered under this prospectus. These documents contain information you should consider when making your
investment decision. To the extent that any statement that we make in this prospectus is inconsistent with statements made in any documents incorporated by reference, the statements made in this prospectus will be deemed to modify or supersede those
made in such documents incorporated by reference.

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