Modern Slavery Act Statement

Statement for the financial year ending March 31, 2024.

Modern Slavery Act Disclosure Statement Disclosure Statement Effective March 2023 This Statement is made pursuant to section 54(1) of the U.K. Modern Slavery Act 2015 and the Australia Modern Slavery Act 2018, and constitutes our, Mimecast Limited (and its affiliates) (collectively,

Modern Slavery Act Disclosure Statement ▪ Consideration of high-risk countries where modern slavery is more prevalent; ▪ A third party risk management process, which includes restricted party screening; and Effective March 2023 ▪ Cross-departmental review and approval of new suppliers, vendors, and service providers with whom Mimecast has contractual relationships (collectively

Modern Slavery Act Disclosure Statement Any Supplier, employee, consultant or contractor who condones or permits noncompliance or a violation of the Code may be subject to negative consequences, up to and including termination of the relationship. Effective March 2023 Audits Mimecast may rely on audit provisions in its Supplier contracts, where applicable, to permit it to verify its Suppliers compliance with contractual representations. Mimecast may conduct such audits through its own personnel or through a third party independent auditor. Processes As part of executive risk management, Mimecast has identified the need to align privacy and security compliance with applicable regulations. Mimecast is committed to strict adherence to all export laws and regulations relating to international dealings in the countries in which it conducts business. Mimecast communicates its expectations of fair, ethical, and lawful business relationships to its Suppliers both during the procurement process and through our contracts with Suppliers. Mimecast has established processes to encourage seeking guidance, asking questions and reporting concerns, including Mimecast’s Whistleblower Hotline, which is open to both internal and external stakeholders. These processes ensure the protection of the confidentiality of any individual making a report subject to applicable law, rule or regulation or to any applicable legal proceedings. They also ensure that the reporting individual will not be subject to retaliation for any reports made in good faith. Training To ensure a high-level of understanding of the risks of modern slavery and human trafficking in our supply chains and our organisation, we provide training to relevant members of staff. Training needs will be evaluated by the Legal and Finance Departments and Mimecast’s Compliance Officer and may be revised as necessary. 3 © 2022 MIMECAST | ALL RIGHTS RESERVED

Modern Slavery Act Disclosure Statement Approval, Communication and Review Effective March 2023 This Modern Slavery Act Disclosure Statement is subject to annual review and approval by the Mimecast Board of Directors, or sooner in response to significant changes in Mimecast’s business practices or applicable law and regulations. The Modern Slavery Statement for financial year ending March 31, 2024 is approved by Mimecast’s Board of Directors as of April 1, 2024. 4 © 2022 MIMECAST | ALL RIGHTS RESERVED