Company: SPH
Filing Date: 2025-02-21
Form Type: 424B5
Source: 0001193125-25-030891
Chunk: 3

Company: SUBURBAN PROPANE PARTNERS LP
Filing Date: 2025-02-21
Form: 424B5
Chunk 3
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 the date when made. Accordingly, such representations, warranties and covenants should not be relied on as accurately
representing the current state of our affairs.

This prospectus incorporates important business and financial information about us that is not included in or delivered with this prospectus. We will provide, without charge, a copy of any or all of the documents incorporated by reference in this prospectus upon written or oral request. Direct any such requests to: Investor Relations, Suburban Propane Partners, L.P., P.O. Box 206, Whippany, New Jersey 07981-0206(telephone number (973) 887-5300). Toobtain timely delivery, you must request the information no later than five business days before the date that you must make your investment decision.

ii

PROSPECTUS SUMMARY

This summary highlights information contained in other parts of this prospectus. Because it is only a summary, it does not contain all of the information that you should consider before investing in our common units and it is qualified in its entirety by, and should be read in conjunction with, the more detailed information appearing elsewhere in this prospectus, any applicable prospectus supplement or free writing prospectus and the documents incorporated by reference herein and therein. You should read all such documents carefully, especially the risk factors and our financial statements and the related notes included or incorporated by reference herein or therein, before deciding to buy our common units. Investing in our securities involves risks that are described in the section of this prospectus entitled “Risk Factors,” under the heading “Item 1A. Risk Factors” in our Annual Report on Form 10-Kand in our Quarterly Reports on Form 10-Q,as updated by our subsequent annual, quarterly and other reports and documents that are incorporated by reference into this prospectus, and in our other filings with the SEC.

Overview

Suburban Propane Partners, L.P. (the “Partnership”), a publicly traded Delaware limited partnership, is a nationwide marketer and
distributor of a diverse array of products meeting the energy needs of our customers. We specialize in the distribution of propane, renewable propane, renewable natural gas (“RNG”), fuel oil and refined fuels, as well as the marketing of
natural gas and electricity in deregulated markets and production of and investing in low-carbon fuel alternatives. In support of our core marketing and distribution operations, we install and service a
variety of home comfort equipment, particularly in the areas of heating and ventilation. We believe, based on LP