Chubb became Berkshire's ninth biggest holding at the end of March, according to a new regulatory filing. AST SpaceMobile — Shares rocketed 33%. Cisco Systems — Shares jumped nearly 5% after the IT giant reported fiscal third-quarter adjusted earnings of 88 cents per share on revenues of $12.70 billion. The results topped analysts' estimates for earnings of 82 cents per share on revenues of $12.53 billion, according to LSEG. Palo Alto Networks — The cybersecurity company saw its stock rise 1% after announcing it will buy cloud security software assets from IBM .

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Persons: Chubb, Berkshire Hathaway, Riley, Hawkins —, — CNBC's Scott Schnipper Organizations: AST, Cisco Systems —, Riley, Management, Alto Networks, IBM, Palo Alto Locations: Zurich, Los Angeles, Hawkins — The Minnesota, Palo