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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) â€� 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-coverâ€� 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.

Sun Country Airlines Holdings, Inc. (SNCY) filed a Form 4 reporting that Chief Executive Officer and Director Jude Bricker sold 2,103 shares of common stock on 07/01/2025 at a weighted-average price of $11.8346 per share.

The footnote clarifies the sale was a mandatory, "sell-to-cover" transaction to satisfy tax-withholding obligations triggered by the vesting of restricted stock units; it was not a discretionary trade.

• Post-transaction, Bricker directly owns 125,486 shares of SNCY.
• The divestiture represents roughly 1.7 % of his prior direct holdings (2,103 of ~127,589 shares).
• No derivative securities were bought or sold, and no Rule 10b5-1 trading plan was cited.

Given the small size and tax-driven nature of the sale, the filing is viewed as neutral from an investment-signal perspective, though it modestly lowers insider share ownership.

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

Senior Vice President & Chief Legal Officer Erin Rose Neale reported a single non-derivative transaction on 07/01/2025. The executive sold 776 common shares at an average price of $11.8053 per share. According to the footnote, the sale was automatically executed to cover statutory tax-withholding obligations triggered by the vesting of restricted stock units (a mandatory “sell-to-cover� and therefore not a discretionary trade). After the transaction, Neale’s direct beneficial ownership stands at 33,884 shares. No derivative securities were acquired or disposed of, and no additional transactions were reported.

The transaction represents a very small fraction of both the executive’s holdings and the company’s total shares outstanding. Given its administrative nature and immaterial size, it is unlikely to have a meaningful impact on the company’s share price or investors� perception of insider sentiment.