- Last week Apple lost its position as the world's most valuable publicly traded company when its shares hit their lowest levels in a year-and-a-half
- Some analysts say the fall in profits could be as high as 20%, compared with the same period last year
- The result would mark the first time Apple has suffered a fall in earnings since 2003 when it opened its iTunes Store
- Apple has faced pressure from investors calling for new big products along with mounting competition from Samsung which unveiled its latest Galaxy S4 handset last month
Apple has come a long way since the company was formed in 1976. Here are some key dates in its long history.
Second quarter profits for the company were down £1.38 billion from the same time last year, and the next 12 months will be crucial.
Technology writer Tom Chatfield says Apple risks losing pace with the marketplaces it once defined.