4th Quarter and Full Fiscal Year 2020 Financial Results

COVID-19 update ▪ Mitigated supply chain risks with minimal impact to date ▪ No erosion in talent attraction cadence ▪ Adjusted workplace conditions to improve physical distancing and safety Implemented symptom checking and temperature screening protocols ▪ Mask usage mandatory, as well as face shields in certain areas ■ Contracted with Chief Medical Advisor to provide best practices guidance ▪ Majority of employees to continue to work from home through end of CY Implementing weekly onsite testing at largest manufacturing locations ■ © Mercury Systems, Inc.

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