Frontier Capital Reports 3.53M Shares of Sun Country (SNCY)

Rhea-AI Filing Summary

Frontier Capital Management Co., LLC filed a Schedule 13G reporting it beneficially owns 3,533,617 shares of Sun Country Airlines Holdings, Inc. common stock (CUSIP 866683105), representing 6.64% of the class as of the reporting event date 06/30/2025. The filing shows Frontier Capital has no sole voting or dispositive power, shared voting power of 1,632,086 shares, and shared dispositive power over all 3,533,617 shares. The reporting person is identified as an investment adviser organized in Delaware with a principal office at 99 Summer Street, Boston, MA.

The filing incorporates a certification that the securities are held in the ordinary course of business and were not acquired to change or influence control of the issuer. Other procedural items in the statement are marked not applicable.

Positive

• Material disclosure: Frontier Capital reports beneficial ownership of 3,533,617 shares (6.64%), meeting SEC transparency thresholds
• Passive classification: Reporting person identified as an investment adviser (IA) and certified holdings are in the ordinary course of business
• Clear voting/dispositive split: Filing specifies 0 sole voting/dispositive power and shared voting power of 1,632,086, clarifying control intent

Negative

• None.

Insights

Financial Analyst

TL;DR: Frontier Capital holds a material passive stake of 6.64% in Sun Country, signaling a notable institutional position without an intent to seek control.

Frontier's reported 3,533,617-share position exceeds the 5% reporting threshold, which is material for market disclosure and investor awareness. The split between shared voting power (1,632,086) and full shared dispositive power indicates the adviser can influence sell/buy decisions but is not claiming sole control. Classification as an investment adviser (IA) and the included certification point to ordinary-course, non-activist behavior; however, a passive 6.64% stake can still matter for liquidity and block trade dynamics in SNCY stock.

Corporate Governance Expert

TL;DR: This Schedule 13G is a routine disclosure of a significant passive holding with no declared intent to alter control.

The filing explicitly states the position was not acquired to change or influence control and the reporting person is an IA, which aligns with Schedule 13G usage for passive investors. From a governance perspective, the absence of sole voting or dispositive power reduces immediate takeover concerns. Still, a >5% holder merits monitoring for any future Schedule 13D amendments or evidence of coordination with other holders that could change the governance landscape.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

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

FRONTIER CAPITAL MANAGEMENT CO.,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 1,632,086.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,533,617.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,533,617.00

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)

6.64 %

12

Type of Reporting Person (See Instructions)

IA

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: FRONTIER CAPITAL MANAGEMENT CO., LLC
(b)	Address or principal business office or, if none, residence: 99 Summer Street Boston, MA 02110
(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: 3,533,617
(b)	Percent of class: 6.64%
(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: 1,632,086
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 3,533,617
Item 5.	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.

FRONTIER CAPITAL MANAGEMENT CO.,LLC

Signature:	Robert E. Phay
Name/Title:	Robert E. Phay, Chief Compliance Officer & General Counsel
Date:	08/14/2025

FAQ

How many Sun Country (SNCY) shares does Frontier Capital own?

Frontier Capital beneficially owns 3,533,617 shares of Sun Country common stock according to the filing.

What percentage of SNCY does Frontier Capital hold?

The filing reports a 6.64% ownership stake in Sun Country's common stock.

Does Frontier Capital have sole voting or dispositive power over SNCY shares?

No. The filing shows 0 sole voting power and 0 sole dispositive power; voting and dispositive powers are reported as shared.

What shared voting and dispositive powers are reported?

Frontier reports shared voting power of 1,632,086 shares and shared dispositive power over 3,533,617 shares.

When is the event date and who is the reporting person?

The event date is 06/30/2025 and the reporting person is Frontier Capital Management Co., LLC.

Does the filing indicate intent to influence control of Sun Country?

The certification states the securities are held in the ordinary course of business and were not acquired to change or influence control of the issuer.