Sec Form 3 Filing - STADIUM CAPITAL MANAGEMENT LLC @ Sleep Number Corp - 2024-10-31

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person STADIUM CAPITAL MANAGEMENT LLC 2. Issuer Name and Ticker or Trading Symbol Sleep Number Corp [ SNBR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 199 ELM STREET 3. Date of Earliest Transaction (MM/DD/YY) 10/31/2024 (Street) NEW CANAAN, CT06840 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $0.01 per share ( 1 ) 401,459 I By: Stadium Special Opportunity I, L.P. ( 2 ) Common Stock, par value $0.01 per share ( 1 ) 1,860,989 I By: Stadium Capital Partners, L.P. ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other STADIUM CAPITAL MANAGEMENT LLC 199 ELM STREET NEW CANAAN, CT06840 X Stadium Capital Management GP, L.P. 199 ELM STREET NEW CANAAN, CT06840 X Stadium Special Opportunity I, L.P. 199 ELM STREET NEW CANAAN, CT06840 See Explanation of Responses STADIUM CAPITAL PARTNERS L P 199 ELM STREET NEW CANAAN, CT06840 See Explanation of Responses SEAVER ALEXANDER M 199 ELM STREET NEW CANAAN, CT06840 X Signatures Stadium Capital Management, LLC; By /s/ Alexander M. Seaver, Manager 11/04/2024 Signature of Reporting Person Date Stadium Capital Management GP, L.P.; By Stadium Capital Management, LLC; By /s/ Alexander M. Seaver, Manager 11/04/2024 Signature of Reporting Person Date Stadium Special Opportunity I, L.P.; By Stadium Capital Management GP, L.P.; By Stadium Capital Management, LLC; By /s/ Alexander M. Seaver, Manager 11/04/2024 Signature of Reporting Person Date Stadium Capital Partners, L.P.; By Stadium Capital Management GP, L.P.; By Stadium Capital Management, LLC; By /s/ Alexander M. Seaver, Manager 11/04/2024 Signature of Reporting Person Date /s/ Alexander M. Seaver 11/04/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 3 is filed jointly by Stadium Capital Management, LLC ("SCM"), Stadium Capital Management GP, L.P. ("SCMGP"), Stadium Special Opportunity I, L.P. ("SSO"), Stadium Capital Partners, L.P. ("SCP") and Alexander M. Seaver (collectively, the "Reporting Persons"). Each of the Reporting Persons may be deemed to be a member of a Section 13(d) group that collectively beneficially owns more than 10% of Sleep Number Corporation's (the "Issuer") outstanding shares of Common Stock. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein. ( 2 )Securities owned directly by SSO. As the general partner of SSO, SCMGP may be deemed to beneficially own the securities owned directly by SSO. SCM, as the investment advisor of SSO and general partner of SCMGP, may be deemed to beneficially own the securities owned directly by SSO. Mr. Seaver, as the manager of SCM, may be deemed to beneficially own the securities owned directly by SSO. ( 3 )Securities owned directly by SCP. As the general partner of SCP, SCMGP may be deemed to beneficially own the securities owned directly by SCP. SCM, as the investment advisor of SCP and general partner of SCMGP, may be deemed to beneficially own the securities owned directly by SCP. Mr. Seaver, as the manager of SCM, may be deemed to beneficially own the securities owned directly by SCP.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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