Mercury Systems is trading 4.1% higher at $80.85 in after-hours trading on October 12; no verified October 12 announcement or news report directly explains the gain. - Shares closed the regular session at $77.67. - Recent developments include the October 8 announcement of a 50,000-square-foot Phoenix production expansion and the October 6 launch of the RES One rugged edge server. - RES One is set for its October 12–14 AUSA debut; these earlier developments provide context but are not confirmed catalysts for the move.