The Westfield Capital Management 401(k) Plan (the “Plan”) offers a convenient way to save for your future through payroll deductions. Eligibility You are eligible to participate in the Plan as of your first day of employment with Westfield Capital Management. Enrollment To enroll, log on to Fidelity NetBenefits at www.401k.com or call 1-800-835-5097 from 8:30 a.m. to 8:00 p.m. ET any business day that the New York Stock Exchange is open. Please also be sure to designate your beneficiary online or complete a beneficiary form and return it to Westfield Capital Management’s benefits department. Employee Contributions Contributions from your pay are made on a pre-tax basis and/or post-tax (Roth) basis (your choice) - up to the IRS annual limit. The 2026 contribution limit for the Plan is $24,500 and the catch-up contribution limit (for those age 50+) is an additional $8,000. A higher catch-up contribution of $11,250 applies for employees aged 60, 61, 62 and 63. You may also automatically increase your retirement savings plan contributions each year through the Annual Increase Program. Westfield Capital Management Contributions Westfield Capital Management matches 100% of your contributions up to 6% of your eligible compensation. The maximum compensation that may be taken into account for the match is $360,000 in 2026. Vesting Vesting refers to your right of ownership to the money in your account. You are immediately vested in your employee pretax account, rollover account, Roth 401(k) after tax deferral account, and any earnings thereon. Employer matching contributions and earnings will be vested in accordance with the following schedules: For More Information For additional details about the Plan, to enroll, change your contribution rates or investment elections, please visit Fidelity NetBenefits at www.401k.com or call 1-800-835-5097 from 8:30 a.m. to 8:00 p.m. ET any business day that the New York Stock Exchange is open. Employer Matching Contributions Years of Services for Vesting Percentage less than 2 0 2 50 3 100 401(k) PLAN 11 // 2026 Employee Benefit Guide download: 401(k) Plan Summary download: 401(k) Enrollment Guide