(Updated from 4:30 to reflect comments from conference call and updated share price.)NEW YORK ( TheStreet) - Dell ( DELL) shares are moving lower in extended-hours trading following fourth-quarter results that missed Wall Street earnings expectations. Dell reported earnings of 51 cents per share on $16.01 billion in revenue. Analysts polled by Thomson Reuters expected Dell to report earnings of 52 cents per share on $15.96 billion in revenue. Dell ended the fourth-quarter with $18.2 billion in cash on its balance sheet, having spent $2.7 billion to buyback its own stock, $561 million during the fourth-quarter.