M Partners Files 13G/A: Reports 0% Ownership in Sleep Number

Sleep Number Corp. Schedule 13G/A amendment: M Partners Fund LP, M Partners Fund (GP) LLC and Ali John Mirshekari report no beneficial ownership of Sleep Number common stock.

Rhea-AI Filing Summary

Sleep Number Corp. Schedule 13G/A amendment: M Partners Fund LP, M Partners Fund (GP) LLC and Ali John Mirshekari report no beneficial ownership of Sleep Number common stock. The filing states 0 shares and 0% ownership, citing 22,864,000 shares outstanding as of January 31, 2026.

The report explains the ownership chain (M Partners Fund LP; general partner M Partners Fund (GP) LLC; managing member Ali John Mirshekari) and includes signed attestations dated 03/27/2026.

Insights

Corporate Governance Analyst

Amendment confirms no reportable stake by the filing group.

The filing formally records that M Partners Fund LP, its general partner and the managing member hold 0 shares (0%) of Sleep Number common stock based on the cited outstanding share count as of January 31, 2026.

Because this is an administrative ownership clarification, the filing is neutral in investor impact; subsequent Schedule amendments or purchases would be disclosed in later filings.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Schedule 13G/A filed by M Partners mean for SNBR ownership?

It states the reporting persons hold 0 shares (0%). The amendment lists M Partners Fund LP, M Partners Fund (GP) LLC and Ali John Mirshekari and cites 22,864,000 shares outstanding as of January 31, 2026 from the company Form 10-K.

Who are the reporting persons named in the SNBR filing?

The reporting persons are M Partners Fund LP, M Partners Fund (GP) LLC, and Ali John Mirshekari. The filing describes the ownership chain and identifies M Partners Fund (GP) LLC as the general partner and Mr. Mirshekari as managing member.

What date and basis does the amendment use for outstanding shares for SNBR?

The filing references 22,864,000 shares outstanding as of January 31, 2026. That figure is cited from Sleep Number Corporation’s Form 10-K for the period ended January 3, 2026 and is used to calculate the 0% ownership percentage.

Does this Schedule 13G/A indicate any voting or dispositive power for the filers in SNBR?

No—voting and dispositive powers are reported as 0. The table in the amendment shows sole and shared voting and dispositive power of 0.00 for each reporting person and records 0 shares beneficially owned.

When was the amendment signed and by whom in the SNBR filing?

All signatures are dated 03/27/2026. The amendment is signed by Ali John Mirshekari in his capacities as Managing Member of M Partners Fund (GP) LLC and as an individual, attesting to the reported ownership information.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/27/2026 - 04:16 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Sleep Number Corp.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

83125X103

(CUSIP Number)

03/25/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 83125X103

1

Names of Reporting Persons

M Partners Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): 83125X103

1

Names of Reporting Persons

M Partners Fund (GP) LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 83125X103

1

Names of Reporting Persons

Ali John Mirshekari

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: M Partners Fund LP is a Delaware limited partnership whose sole general partner is M Partners Fund (GP) LLC. The managing member of M Partners Fund (GP) LLC is Ali John Mirshekari. As a result, Ali John Mirshekari is deemed to be the indirect owner of the shares held directly by M Partners Fund LP. Despite such shared beneficial ownership, the Reporting Persons disclaim that they constitute a statutory group within the meaning of Rule 13d-5(b)(1) of the Securities Exchange Act of 1934. Based on the 22,864,000 shares of common stock, par value $0.01 per share, outstanding as of January 31, 2026, as reported in the Form 10-K for the annual period ended January 3, 2026, of Sleep Number Corporation.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Sleep Number Corp.
(b)	Address of issuer's principal executive offices: 1001 Third Avenue South, Minneapolis, MN 55404
Item 2.
(a)	Name of person filing: This Schedule is filed by M Partners Fund LP, M Partners Fund (GP) LLC and Ali John Mirshekari.
(b)	Address or principal business office or, if none, residence: The principal business address of the Reporting Persons is 24 Shipyard Drive, Suite 102, Hingham, MA 02043.
(c)	Citizenship: M Partners Fund LP is a Delaware limited partnership. M Partners Fund (GP) LLC is a Delaware limited liability company. Ali John Mirshekari is a citizen of the United States of America.
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.:
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 0
(b)	Percent of class: 0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

M Partners Fund LP

Signature:	/s/ Ali John Mirshekari
Name/Title:	Ali John Mirshekari, Managing Member of M Partners Fund (GP) LLC
Date:	03/27/2026

M Partners Fund (GP) LLC

Signature:	/s/ Ali John Mirshekari
Name/Title:	Ali John Mirshekari, Managing Member
Date:	03/27/2026

Ali John Mirshekari

Signature:	/s/ Ali John Mirshekari
Name/Title:	Ali John Mirshekari
Date:	03/27/2026