International Business Machines' stock (IBM) shares traded , up 6.21% during regular trading hours after a sharp premarket rally. The move followed quarterly earnings that exceeded expectations and renewed focus on IBM’s long-term growth path. Software revenue climbed 14%, while infrastructure revenue rose 21%. For full-year 2025, IBM delivered 6% revenue growth, the strongest pace in many years. Fourth-quarter revenue growth reached 9%, marking the fastest quarterly expansion in more than three years.