Generally, if you are a regular full-time or part-time employee and at least age 18, you are eligible to participate in the Iron Mountain 401(k) Plan. There is no waiting period for participation; however, you will be able to enroll as soon as administratively possible once you are eligible.

Temporary or casual employees and contractors are not eligible to participate. If you are ineligible and you later change to a group that is eligible to participate in the Iron Mountain 401(k) Plan, you will be immediately eligible to participate in the Plan, as long as you are at least 18. Any service time while you were not eligible will be credited.

You can enroll in the Iron Mountain 401(k) Plan at any time!

If you have not enrolled in the Plan within 35 days from becoming eligible, you will be automatically enrolled in the Plan at a Pre-tax contribution rate of 3% of your eligible earnings. This amount will automatically increase each year by 1%, up to a maximum of 15% of your eligible earnings.

If you do not make an investment election, you will be automatically invested in a T. Rowe Price target date fund based on your date of birth and assuming a retirement age of 65. Target date funds are an asset mix of stocks, bonds and other investments that automatically becomes more conservative as the fund approaches its target retirement date and beyond. Principal invested is not guaranteed.

We encourage you to take an active role in the Plan and to choose a contribution rate and investment options that are appropriate for you. If you do not wish to contribute to the Plan, you must change your contribution rate to 0% within the first 35 days of your eligibility.

You may change your contribution rate at any time through the Contribution section of NetBenefits^®, or by calling the Fidelity Retirement Benefits Center at 800-835-5095.

Enroll online at any time through the Contributions section of NetBenefits^®, or by calling the Fidelity Retirement Benefits Center at 800-835-5095.

Once you enroll in the Plan, your salary deductions will generally begin within two pay periods, or as soon as administratively possible.

Through automatic payroll deduction, you may contribute between 0% and 75% of your eligible pay in before-tax (traditional) and Roth (after-tax) contributions, up to the IRS limits. In addition, you can choose to automatically increase your retirement savings plan contributions each year through the Annual Increase Program. Sign up online by accessing the Contribution section of NetBenefits^®, or by calling the Fidelity Retirement Benefits Center at 800-835-5095.

The IRS contribution limit for 2025 is $23,500.

If you have reached age 50 or will reach 50 during the calendar year January 1 – December 31 and are making the maximum plan or IRS contribution, your contributions will automatically continue until you reach the catch-up contribution limit. The annual catch-up contribution is $7,500.

Starting in 2025, the SECURE 2.0 Act increases the limit for you if you have attained age 60, 61, 62, or 63 in a given calendar year. The limit for 2025 is $11,250.

A Roth contribution to your retirement savings plan allows you to make after-tax contributions and take any associated earnings completely tax free at retirement - as long as the distribution is a qualified one. A qualified distribution, in this case, is one that is taken at least five tax years after your first Roth 401(k) contribution and after you have attained age 59½, or become disabled or die. Through automatic payroll deduction, you can contribute between 0% and 75% of your eligible pay as designated Roth contributions, up to the annual IRS dollar limits.

Find more information online within the "Learn" section of NetBenefits^®.

Roth In-Plan Conversion options are available in the Iron Mountain 401(k) Plan. This option provides you with the opportunity to convert all, or a portion of your non-Roth assets to Roth assets.

Special tax rules apply to Roth In-Plan Conversion options and are an important consideration in determining whether to do such a conversion. Generally, the taxable amount of a conversion is determined as if the converted assets were distributed to you from the Plan, although the assets will only be transferred to the Roth portion of your account and no amount will actually be paid from the Plan. The taxable amount (determined as if actually distributed to you) is taxable to you in the year of the conversion and should be reported on your income tax return for that year. For more information related to the tax consequence of a conversion, you should consult your tax or financial advisor before undertaking such a conversion. You may contact the Fidelity Retirement Benefits Center at 800-835-5095 to process a Roth In-Plan Conversion.

On NetBenefits^®, select the Contribution Amount link for the Plan to make changes to your contribution amount, or call the Fidelity Retirement Benefits Center at 800-835-5095.

In addition to your own contributions, Iron Mountain helps you prepare for retirement with matching 401(k) contributions. Iron Mountain matches 67 cents for each dollar you contribute, up to the first 6% of your eligible earnings each paycheck. If you contribute 6%, you’ll see 4% in employer matching contributions added to your retirement savings.

Iron Mountain will also perform a true-up calculation for eligible participants every year to make sure you receive the maximum company match contribution for the prior year. The match true-up calculation looks at your total annual contributions as a percentage of your total annual eligible earnings. If your total contributions qualify for any match that you didn’t receive on a per-pay period basis, Iron Mountain will add money to your account to make up the difference as long as you are actively employed on the last day of the plan year.

Vesting refers to a portion of the 401(k) account that you own. You vest, or own, all of the contributions made to your account immediately, including any matching contributions from Iron Mountain.

Any company match made prior to 2020 is subject to a vesting schedule. Review the Summary Plan Description for details.

To help you meet your investment goals, the Plan offers you a range of options. You can select a mix of investment options that best suits your goals, time horizon, and risk tolerance. The many investment options available through the Plan include conservative, moderately conservative, and aggressive funds. A complete description of the Plan’s investment options and their performance, as well as planning tools to help you choose an appropriate mix, are available in the Investment section of NetBenefits^®. Additionally, you have access to managed accounts and self-directed brokerage options.

We encourage you to take an active role in the Iron Mountain 401(k) Plan and choose investment options that best suit your goals, time horizon, and risk tolerance. If you do not select specific investment options in the Plan, your contributions will be invested in the T. Rowe Price Retirement Trust Class F with the target retirement date closest to the year you might retire, based on your current age and assuming a retirement age of 65.

If no date of birth or an invalid date of birth is on file at Fidelity, your contributions may be invested in the T. Rowe Price Retirement 2005 Trust Class F. More information about the T. Rowe Price Retirement Trust Class F options can be found online. Target Date Funds are an asset mix of stocks, bonds and other investments that automatically becomes more conservative as the fund approaches its target retirement date and beyond. Principal invested is not guaranteed.

Fidelity^® Personalized Planning & Advice ("The Service")
Fidelity^® Personalized Planning & Advice is a retirement goal based managed account service with a team of portfolio managers who manage the investments in your workplace savings plan account. Based on your unique needs and goals, our team of professionals will create a plan that considers your total financial situation, put the plan into action, and work for you putting in the time, resources, and knowledge needed to keep you on track for retirement.

This includes:

• Regularly monitoring and rebalancing of your account
  
• Strategy refinement that supports you as your financial situation evolves
  
• Quarterly check-ins, which include your progress toward key milestones
  
• Personal planning dashboard that includes progress to retirement and other profile details

For those desiring the most investment flexibility and choice, the Plan offers Fidelity BrokerageLink^®, a self-directed brokerage account, which provides you with the opportunity to select from thousands of investment options beyond those offered in the standard plan lineup. More information about BrokerageLink^®, including an overview, the commission schedule, and a fact sheet that outlines the Plan-level restrictions and other settings, is available online at NetBenefits. Click on "Quick Links," then select "BrokerageLink."

If you have not already selected your beneficiaries, or if you have experienced a life-changing event such as a marriage, divorce, birth of a child, or a death in the family, it’s time to consider your beneficiary designations. Fidelity’s Online Beneficiaries Service offers a straightforward, convenient process that takes just minutes. To make your elections, click on the Profile link on NetBenefits^®, then select Beneficiaries and follow the online instructions.

Although your Plan account is intended for the future, you may take a loan from your account. To learn more or to request a loan, visit the Loans section on NetBenefits^® or call 800-835-5095.

Withdrawals from the Plan are generally permitted when you terminate your employment, retire, reach age 59½, become permanently disabled, or have financial hardship, as defined by your plan.

When you leave Iron Mountain, you can withdraw contributions and any associated earnings from your account. If your account balance is $1,000 or less, it will automatically be distributed to you. If your balance is more than $1,000 but less than $7,000, your balance will be rolled over to an IRA. If your account balance is $7,000 or more, you can leave your balance in the Plan.

Learn more about and/or request a withdrawal by visiting the Withdrawals section on NetBenefits^®, or by calling the Fidelity Retirement Benefits Center at 800-835-5095.

You are permitted to roll over eligible Pre-tax and after-tax contributions from another 401(k) plan, Roth 401(k) plan, 401(a) plan, 403(b) plan, Roth 403(b) plan, a governmental 457(b) retirement plan, or a Roth 457(b) retirement plan account or eligible Pre-tax contributions from conduit individual retirement accounts (IRAs). A conduit IRA is one that contains only money rolled over from an employer-sponsored retirement plan that has not been mixed with regular IRA contributions.

Additional information can be obtained on the Rollovers section of NetBenefits^®, or by calling the Fidelity Retirement Benefits Center at 800-835-5095.

Be sure to consider all your available options and the applicable fees and features of each before moving your retirement assets.

Fidelity offers enhanced security features such as two-factor authentication and MyVoice^® to help keep your account secure.

• Two-factor authentication: With two-factor authentication, you get an additional security check point every time you login to NetBenefits^®, or whenever you log on from a new device. You can set up two-factor authentication through NetBenefits when the plan opens.
• MyVoice^®: After the restricted period ends, you can call Fidelity and can set up MyVoice^®, a way to conveniently secure and verify your identity based on your unique voiceprint, which is a combination of your physical and behavioral voice patterns. When you call, say "account access" when prompted, or your Fidelity representative will offer to enroll you. You’ll just need to provide consent to create your voiceprint.

The Plan’s Summary Plan Description (SPD) describes the material features of the Plan. This resource provides details about how the Plan works so you can decide how it will fit into your overall financial plan. You may find the SPD and other important information any time on the Fidelity NetBenefits Plan Information and Documents page.

You have many support options available at Fidelity. From practical education and easy-to-use tools to one-on-one support, Fidelity can help you understand your 401(k) Plan and investment options so that you can make the right choices for your financial future.

Online or on the go through Fidelity NetBenefits^®: Access your account through Fidelity’s website at www.netbenefits.com or download the NetBenefits^® mobile app to access your account from your mobile device anytime, anywhere. The NetBenefits^® app is available in Spanish – just update your app language preferences.

By phone at 800-835-5095 or 800-587-5282 (Spanish): Call the Fidelity Retirement Benefits Center Monday through Friday, from 8:30 a.m. until midnight ET. Experienced Fidelity representatives are available to provide account support and investment help. The Fidelity Retirement Benefits Center can support you in your language of choice; interpreters are available by contacting the English contact number.

At a Fidelity branch location: The professionals in the Investor Centers are skilled to provide you with the latest retirement planning insights and investment help. Investor Center products and services are offered beyond the 401(k) Plan. To find a location nearest you, go to fidelity.com/branchlocator.

Fidelity retail products and services are offered beyond those of your employer-sponsored retirement plan.