UPDATE 3-Apple shares slide by most in over 4 years on disappointing iPhone sales
January 24, 2013 at 11:23 AM EST
Jan 24- Apple Inc's shares fell by as much as 12 percent on Thursday, staging their biggest percentage drop in over four years and slicing more than $50 billion from the company's market value, as disappointing holiday-period iPhone sales reinforced fears it is losing its dominance in smartphones.