International Business Machines Corp. reported quarterly revenue that missed analysts’ estimates, signaling Chief Executive Officer Arvind Krishna’s turnaround plan will take more time to pan out. Sales fell 6.5% to US$20.4 billion in the three months ended Dec. 31, the Armonk, New York-based company said Thursday in a statement. That was below the US$20.75 billion analysts had forecast, on average, and marked the 10th consecutive quarter with no year-over-year increase in revenue. The shares fell in extended trading.