Sun Country Airlines Holdings, Inc. SEC Filings

Form 144 notice for Sun Country Airlines Holdings, Inc. (SNCY) reports a proposed sale of 704 common shares through Fidelity Brokerage Services LLC with an aggregate market value of $9,384.32. The shares are scheduled for sale on 09/03/2025 on NASDAQ. The 704 shares were acquired by restricted stock vesting as 8 shares on 03/31/2025 and 696 shares on 06/30/2025, with the acquisition characterized as compensation. The filing also discloses prior sales by John M. Gyurci of 3,150 shares on 06/12/2025 (gross proceeds $36,193.50) and 309 shares on 07/01/2025 (gross proceeds $3,619.62). The filer certifies no undisclosed material adverse information and includes the required representations for Rule 144 compliance.

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.

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.

Sun Country Airlines Holdings appointed D. Torque Zubeck as Senior Vice President and Chief Financial Officer, effective September 2, 2025, replacing interim CFO Bill Trousdale who will step down September 1, 2025. Mr. Zubeck, age 55, brings over 30 years of finance experience, including 22+ years in airline leadership, most recently serving as CFO of Mesa Airlines (March 2021 to September 2023) and 20 years in roles at Alaska Airlines where he led the Virgin America integration.

His employment letter provides an annual base salary of $350,000, eligibility for the Companys annual cash bonus program, a sign-on equity grant with a grant-date value of $800,000 in time-based restricted stock units vesting annually over three years, eligibility for annual equity awards and standard senior executive benefits. If terminated without "Cause," he is entitled to continued base salary and healthcare for 12 months subject to execution of a release and compliance with restrictive covenants. The full employment letter is filed as Exhibit 10.1.

Sun Country Airlines Holdings, Inc. (SNCY) – Form 4 filing dated 07/03/2025

Chief Revenue Officer & SVP Grant Whitney reported two small open-market sales of Sun Country common stock:

• 394 shares sold on 07/01/2025 at $11.7529 per share. The transaction was a mandatory “sell-to-cover” to satisfy tax withholding on recently vested RSUs.
• 893 shares sold on 07/02/2025 at $12.21 per share under a pre-arranged Rule 10b5-1 trading plan adopted on 03/04/2024.

Following the transactions, Whitney’s direct holding declined from 28,079 shares to 26,799 shares, a net decrease of 1,280 shares (≈4.6% of his prior position). No derivative securities were reported.

The filing signals routine equity administration rather than a meaningful shift in insider sentiment: the first sale was non-discretionary for tax purposes, while the second was executed pursuant to a pre-scheduled plan. From a valuation perspective, the total proceeds of roughly $15,000 are immaterial to SNCY’s market capitalization and do not affect operating fundamentals.

Form 4 filed on July 3, 2025 discloses two small open-market sales of Sun Country Airlines Holdings, Inc. (SNCY) common stock by William Trousdale, Interim CFO & SVP.

• July 1, 2025: 442 shares sold at $11.7568 per share.
• July 2, 2025: 996 shares sold at $12.21 per share.

After these transactions Trousdale directly owns 26,993 shares, down from 28,431. The first sale was an automatic “sell-to-cover” to satisfy tax withholding on restricted stock unit (RSU) vesting; the second was executed under a Rule 10b5-1 plan adopted September 12, 2024. No derivative securities were involved, and no discretionary trades were reported.

The combined disposition of 1,438 shares represents approximately 5.1% of Trousdale’s reported holdings, a relatively immaterial amount for the issuer’s overall float. Because one sale was tax-related and the other pre-programmed, the filing does not indicate a meaningful change in insider sentiment but does update the public float and insider ownership record.