Which company is known as Big Blue ?

Which company is known as "Big Blue" :  International Business Machines (IBM). Corporation is called the Big Blue Company. According to the IBM website, the term did not originate from within the company. There are many stories behind "Big Blue" for IBM. Some of main stories are:

1. IBM was among the blue-chip stocks on the US stock market, IBM was a steady and consistently high performer over the years. It regularly gave good dividends to its shareholders and that's why it came to be called the Big Blue. 

2. Big Blue term term may have been derived from the blue user manuals that came with certain IBM products. 

3. Another theory is that the term simply refers to the company's blue logo.