[SCHEDULE 13G/A] Sun Country Airlines Holdings, Inc. SEC Filing

Rhea-AI Filing Summary

Zimmer Partners and affiliated entities report a shared beneficial ownership position of 2,225,900 shares in Sun Country Airlines Holdings, Inc. This stake represents approximately 4.2% of Sun Country's outstanding common stock, based on an outstanding share count of 53,316,378 as of 06/30/2025. The Reporting Persons—Zimmer Partners, LP; Zimmer Financial Services Group LLC; Zimmer Partners GP, LLC; and Stuart J. Zimmer—hold shared voting and shared dispositive power over the shares and report no sole voting or dispositive power. The filing is made on Schedule 13G/A and includes a certification that the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.

Positive

• Meaningful minority stake: Reporting Persons beneficially own 2,225,900 shares (~4.2%), a sizeable position that warrants market attention.
• Shared voting and dispositive power: The holders disclose clear authority to vote and dispose of the reported shares, providing transparency on influence.

Negative

• Below 5% threshold and 13G filing: The position is classified as passive and is under 5%, limiting immediate governance or control implications.

Insights

Financial Analyst

TL;DR: A 4.2% passive stake in Sun Country is notable but below 5%, signaling limited immediate control impact while meriting monitoring.

The Reporting Persons hold 2,225,900 shares (≈4.2%) and report shared voting and dispositive power, with no sole control. Because this disclosure is a Schedule 13G/A and includes a certification of ordinary-course holdings, it characterizes the position as passive rather than an activist intent. For investors, the position is material enough to warrant attention but does not by itself imply a change in corporate control or governance strategy.

Corporate Governance Expert

TL;DR: Shared voting rights without sole power and a 13G/A filing indicate a coordinated but non-controlling minority stake.

The filing lists multiple related entities and an individual as Reporting Persons and classifies them with reporting codes shown in the statement. All Reporting Persons report shared voting and dispositive power of the same 2,225,900 shares, and the filing explicitly states the holdings were not acquired to influence control. From a governance perspective, this stake creates potential for engagement but, given the passive certification and sub-5% size, it does not constitute a control position under typical thresholds.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Sun Country Airlines Holdings, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

866683105

(CUSIP Number)

06/30/2025

(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)

SCHEDULE 13G

CUSIP No. 866683105

1

Names of Reporting Persons

Zimmer Partners, 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 2,225,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,225,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,225,900.00

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)

4.2 %

12

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13G

CUSIP No. 866683105

1

Names of Reporting Persons

Zimmer Financial Services Group 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 2,225,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,225,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,225,900.00

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)

4.2 %

12

Type of Reporting Person (See Instructions)

OO, HC

SCHEDULE 13G

CUSIP No. 866683105

1

Names of Reporting Persons

Zimmer Partners 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 2,225,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,225,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,225,900.00

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)

4.2 %

12

Type of Reporting Person (See Instructions)

OO, HC

SCHEDULE 13G

CUSIP No. 866683105

1

Names of Reporting Persons

Stuart J. Zimmer

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 2,225,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,225,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,225,900.00

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)

4.2 %

12

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Sun Country Airlines Holdings, Inc.
(b)	Address of issuer's principal executive offices: 2005 CARGO ROAD, MINNEAPOLIS, Minnesota, 55450
Item 2.
(a)	Name of person filing: Zimmer Partners, LP, a Delaware limited partnership (the "Investment Manager"), Zimmer Financial Services Group LLC, a Delaware limited liability company ("ZFSG"), Zimmer Partners GP, LLC, a Delaware limited liability company (the "GP"), and Stuart J. Zimmer (collectively, the "Reporting Persons"). ZFSG is the sole member of the GP. Stuart J. Zimmer, a revocable trust for his benefit, and an irrevocable trust for his immediate family are the sole members of ZFSG. The GP is the general partner of the Investment Manager. The Investment Manager is the investment manager of ZP Master Utility Fund, Ltd. and ZP Master MidCap Fund, Ltd. and certain separately managed accounts.
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is c/o Zimmer Partners, LP, 9 West 57th Street, 33rd Floor New York, NY 10019.
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock, par value $0.01 per share
(e)	CUSIP No.: 866683105
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: The Reporting Persons may be deemed the beneficial owners of 2,225,900 shares of Common Stock. The Reporting Persons may be deemed the beneficial owners of approximately 4.2% of the outstanding shares of Common Stock. This percentage was determined by dividing 2,225,900 by 53,316,378, which is the number of shares of Common Stock outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 1, 2025 with the Securities and Exchange Commission. The Reporting Persons have the shared power to vote and dispose of the 2,225,900 shares of Common Stock beneficially owned.
(b)	Percent of class: 4.2%
(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: 2,225,900
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 2,225,900
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 acquired and are held in the ordinary course of business and 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.

Zimmer Partners, LP

Signature:	/s/ Jelena Napolitano
Name/Title:	Jelena Napolitano/ Authorized Person
Date:	08/14/2025

Zimmer Financial Services Group LLC

Signature:	/s/ Stuart J. Zimmer
Name/Title:	Stuart J. Zimmer / Director
Date:	08/14/2025

Zimmer Partners GP, LLC

Signature:	/s/ Stuart J. Zimmer
Name/Title:	Stuart J. Zimmer/ Director, Zimmer Financial Services Group LLC, its Managing Member
Date:	08/14/2025

Stuart J. Zimmer

Signature:	/s/ Stuart J. Zimmer
Name/Title:	Stuart J. Zimmer / Self
Date:	08/14/2025

FAQ

How many Sun Country (SNCY) shares do Zimmer Partners and affiliates beneficially own?

The Reporting Persons beneficially own 2,225,900 shares of Sun Country common stock.

What percentage of SNCY does this stake represent?

The reported position represents approximately 4.2% of Sun Country's outstanding common stock.

Do the Reporting Persons have sole voting or dispositive power over the shares?

No. The Reporting Persons report 0 sole voting power and 0 sole dispositive power; they report shared voting and shared dispositive power for all 2,225,900 shares.

Was this stake reported as an attempt to influence control of Sun Country (SNCY)?

The filing includes a certification that the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.

Which entities are the Reporting Persons named in the Schedule 13G/A for SNCY?

The Reporting Persons are Zimmer Partners, LP, Zimmer Financial Services Group LLC, Zimmer Partners GP, LLC, and Stuart J. Zimmer.