Table of Contents 1. Message from our CEO 8. Deliver a Remarkable Experience 2. Why This Matters • Protect Corporate Opportunities and Assets 3. Compliance Decision Tree • Protect Intellectual Property 4. Mimecaster Responsibilities • Maintain Confidentiality • Protect Personal Data 5. Build Our Company Together • Avoid Conflicts of Interest ▪ Use Sound Judgment in Mimecast9s Financial Operations • No Outside Employment ▪ Prohibit Insider Trading • Responsibly Use Gifts and Entertainment 6. Invest in One Another 9. Bring a Resilient Spirit ▪ Commitment to Workplace Safety • Comply with Anti-Bribery and Anti-Corruption Laws ▪ Mindfulness in Social Media Use • Adhere to International Trade Controls ▪ Commitment to Diversity, Equity, and Inclusion • Follow Competition and Anti-Trust Requirements 7. Make Things Better • Seek Guidance & Report Suspected Violations ▪ Build a Healthy Culture • Disciplinary Action ▪ Involvement with Civic Activities • Participate in Investigations ▪ Commitment to the Environment, Social, and • Prohibition on Retaliation and Victimization Governance Framework • Waivers • Review ©2024 Mimecast. All Rights Reserved.

Code of Business Conduct and Ehtics - Page 2 Code of Business Conduct and Ehtics Page 1 Page 3