Keysight shares surged nearly 14% premarket after strong Q4 results and upbeat fiscal 2025 guidance prompted price-target hikes from Barclays and Wells Fargo. Q4 revenue rose 10% to $1.42 billion, beating estimates, and Q1 FY26 revenue is projected to grow 18% - 20%. The company also approved a $1.5 billion share buyback.