VERTEX AEROSPACE

employer retirement income contributions are contributed in the same manner as the participant’s other investment elections. If the participant has not made investment elections, company matching contributions will automatically be invested in the appropriate targeted maturity fund based on the participant’s year of birth. Certain eligible RMI participants hired or rehired as of specified dates negotiated with the unions will receive retiree medical savings contributions to their accounts in an amount equal to $0.35 per hour worked. These employer contributions are contributed to the appropriate targeted maturity fund based on the participant’s year of birth but may be transferred by the participant from the default fund to any eligible fund. Participant Accounts Each participant’s accoun

he Company and certain subsidiary locations that have adopted the Plans. Employees are immediately eligible for plan participation. Effective January 1, 2024, all participants are fully vested in the value of their contributions plus actual earnings thereon at all times. Company contributions are therefore nonforfeitable. Prior to January 1, 2024, contributions of the collectively bargained employees of the RMI Titanium Co. LLC ("RMI participants") vested on an incremental basis, becoming fully vested after three years of service. Employee Contributions Eligible employees may elect to contribute to the Plans a percentage of eligible compensation as pre-tax or Roth after-tax, when combined not to exceed the Internal Revenue Service ("IRS") limit, with a maximum of 25% in the aggregate. Elig

payroll period following the election. Participants direct their contributions in multiples of 1% into various investment options offered by the Plans. Eligible employees will be automatically enrolled in the Plans after 60 days of hire or rehire and subject to automatic payroll deductions equal to 3% of eligible compensation, which will be contributed to the Plans as pre-tax savings, unless the employee chooses to either enroll sooner or to not participate. After 90 days of plan participation, the pre-tax savings rate will be increased by 1% on each April 1 until the pre-tax savings rate attains a target rate of 6% of eligible compensation. The employee can change the contribution rate, annual rate increase, and target contribution rate or stop automatic enrollment at any time. The Plans

4.25% to 9.25% as of December 31, 2023. For each loan request, a one-time $75 loan processing fee and an annual $25 loan maintenance fee are deducted from the loan amount to cover administrative expenses. Benefit Payments To Participants While actively employed, participants have access to account funds through loans, nonhardship withdrawals of after-tax and rollover contributions, withdrawals for participants over age 59 1 / 2 , hardship withdrawals of pre-tax contributions, and the related investment earnings on pre-tax contributions. No portion of a legacy RTI MPP balance shall be available for withdrawals during employment. On termination of service due to death, disability, or retirement, participants with an account balance greater than $7,000 may elect to leave their investment in t

period resulted in anti-dilutive impact to EPS. ​ ​ ​ 13 . EMPLOYEE BENEFIT AND DEFERRED COMPENSATION PLANS The Company maintains a 401(k) plan that covers eligible employees. The Company matches up to 6 % of eligible compensation during the period in which an eligible participant contributes to the plan. Matching 401(k) contributions were $ 14,713 , $ 12,641 , and $ 11,285 for the years ended December 31, 2025, 2024, and 2023, respectively. F-42 Table of Contents Vertex, Inc. and Subsidiaries Notes to Consolidated Financial Statements (continued) (Amounts in thousands, except per share data) Stock-Based Award Plans The 2020 Incentive Award Plan (the “2020 Plan”) provides the ability to grant cash and equity-based incentive awards to eligible employees, directors and service providers in o

xpense is recognized and any previously recognized compensation expense is reversed. As of December 31, 2025, the first-year target was achieved, and the corresponding PSUs became fully vested. Additionally, the Company determined that it was probable that the performance targets for the annual measurement periods would be achieved at varying levels across the second and third-year measurement periods. ​ The following table summarizes PSU activity for the year ended December 31, 2025: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Grant Date Fair ​ ​ Units ​ Value Per Share Outstanding at January 1, 2025 ​ 192 ​ $ 53.46 Granted ​ 30 ​ ​ 34.56 Vested ​ ( 71 ) ​ ​ 50.86 Forfeited ​ ( 10 ) ​ ​ 51.17 Outstanding at December 31, 2025 ​ 141 ​ $ 50.86 ​ At December 31, 2025, a maximum of $ 5,941 of unreco

se investments will occur in advance of experiencing the benefits from such investments and may vary in scope and scale over future periods. General and Administrative General and administrative expenses consist primarily of personnel and related expenses for administrative, finance, information technology, legal, risk management, facilities, and human resources staffing, including salaries, benefits, bonuses, severance, stock-based compensation, professional fees, insurance premiums, facility costs, amortization of cloud computing arrangement implementation costs, and other internal support and infrastructure costs. We expect our general and administrative expenses to increase in absolute dollars as we continue to expand our operations, hire additional personnel, and integrate current and