SUBURBAN PROPANE PARTNERS LP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

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Suburban Propane

240 Route 10 West

Whippany, NJ

07981-0206

www.suburbanpropane.com

Michael A. Stivala

President and Chief Executive Officer

March 25, 2024

Dear Fellow Suburban Propane Unitholder:

You are cordially invited to attend the Tri-Annual Meeting of the Limited Partners of Suburban Propane Partners, L.P. to be held on Tuesday, May 21, 2024, beginning at 9:00 a.m. E.T. at our executive offices at One Suburban Plaza, 240 Route 10 West, Whippany, New Jersey.

Whether or not you plan to attend in-person, it is important that your units be represented at the meeting. You may vote on the matters that come before the meeting by completing the enclosed proxy card and returning it in the envelope provided. Alternatively, you may also vote over the Internet or by telephone before the Tri-Annual Meeting.

Attendance at the Tri-Annual Meeting will be open to holders of record of common units as of the close of business on March 22, 2024. I look forward to greeting those of you who will be able to attend the meeting.

Sincerely yours,

Michael A. Stivala

President and Chief Executive Officer

NOTICE OF TRI-ANNUAL MEETING

TO BE HELD ON

May 21, 2024

The Tri-Annual Meeting of the Limited Partners of Suburban Propane Partners, L.P. (“Suburban”) will be held at 9:00 a.m. E.T. on Tuesday, May 21, 2024, at our executive offices at One Suburban Plaza, 240 Route 10 West, Whippany, New Jersey, for the following purposes:

To elect eight Supervisors to three-year terms;

To ratify our independent registered public accounting firm for our 2024 fiscal year;

To approve Suburban’s Amended and Restated 2018 Restricted Unit Plan;

To provide our Limited Partners with the opportunity to cast an advisory vote on the compensation of our named executive officers; and

To consider any other matters that may properly come before the meeting.

Only holders of record of common units as of the close of business on March 22, 2024 are entitled to notice of, and to vote at, the meeting.

By Order of the Board of Supervisors,

Bryon L. Koepke

Vice President, General Counsel & Secretary

March 25, 2024

IMPORTANT

Your vote is important. Whether or not you expect to attend the meeting virtually, we urge you to complete and return the enclosed proxy card at your earliest convenience in the postage-paid envelope provided, or vote using the Internet or by telephone prior to the virtual-only meeting.

TABLE OFCONTENTS

One Suburban Plaza

240 Route 10 West

Whippany, New Jersey 07981-0206

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