ii To All Participants and Eligible Dependents: On September 6, 1966, the Executive Council of The International Association of Machinists and Aerospace Workers established a nationwide Trust Fund known as the IAM National Health and Welfare Plan. On October 1, 1979, it became a part of the National IAM Benefit Trust Fund (Plan). We are pleased to provide you with this Plan Document and Summary Plan Description hereinafter described as the SPD, which describes in detail the benefits available to active and eligible retired employees and their eligible dependents through the National IAM Benefit Trust Fund effective January 2025. We urge you to read this SPD carefully so that you may fully understand the benefits available to you and your family. We also suggest that you keep this SPD with your important papers so it will be readily available for future reference. Here are some things to keep in mind: This SPD replaces and supersedes all other SPDs previously published by the Fund. If any changes are made to the Plan’s benefits provisions, they will be communicated to you via a notice that will be sent to the last known mailing address the Fund Office has on file for you. Therefore, it is extremely important that you notify the Fund Office if you change your mailing address. The benefits described in the SPD are not guaranteed (vested). All benefits may be changed, reduced or eliminated at any time by the Board of Trustees, to the extent allowed by law. The Board reserves the right to set the effective date of any Plan change. The information set forth in the SPD is effective for the health and welfare benefits provided by the Plan with respect to all claims incurred on or after January 1, 2026 , unless otherwise stated. The administration of these benefits and accompanying claims is subject to the terms of any agreements executed between the Trustees and third-party providers of benefits and or services under the terms of the Plan. The Board solely is authorized to interpret the terms of the Plan and has discretion to decide all questions about the Plan, including questions about your eligibility for benefits, the amount and type of benefits payable to you, and the application of any Plan term or provision. Your Employer or Union Representative does not have the authority to interpret and/or apply the Plan on behalf of the Board or to act as an agent of the Board. If you have any questions about your benefits, please write or call the Fund Office. Our staff will be pleased to assist you. Sincerely, The Board Of Trustees