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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K Annual Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the fiscal year ended September 25 , 2021 Transition Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 Commission File Number : 1-14222 SUBURBAN PROPANE PARTNERS , L.P. ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) Title of each class Common Units 22-3410353 ( I.R.S. Employer Identification No. ) 240 Route 10 West Whippany , NJ 07981 ( 973 ) 887-5300 ( Address , including zip code , and telephone number , including area code , of registrant's principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol SPH Name of exchange on which registered New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No > Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No □□□ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Non - accelerated filer Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Accelerated filer Smaller reporting company Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No > The aggregate market value as of March 26 , 2021 of the registrant's Common Units held by non - affiliates of the registrant , based on the reported closing price of such units on the New York Stock Exchange on such date ( $ 15.06 per unit ) , was approximately $ 941,690,000 . As of November 22 , 2021 , there were 62,963,712 Common Units of Suburban Propane Partners , L.P. outstanding . Documents Incorporated by Reference : None Total number of pages ( excluding Exhibits ) : 128