Richest Businesses (companies) till now / Most valuable companies in history

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1. The Dutch East India Company in 1637
   Value then: 78 million Dutch Guilders // Adjusted to 2012 dollars: $7.4 trillion 
2. The Mississippi Company in 1720
   Value then: 300 million British Pounds // Adjusted to 2012 dollars: U.S. $6 trillion 
3. The South Sea Company in 1720
   Value then: 200 million British Pounds // Adjusted to 2012 dollars: U.S. $4 trillion 
4. Saudi Aramco in 2012
   Value today: U.S. $3.6 trillion. Adjusted to 2012 dollars: U.S. $3.6 trillion.
5. IBM in 1967
   Value then: $193 billion // Adjusted to 2012 dollars: U.S. $1.3 trillion
6. PetroChina in 2007
   Value then: $1 trillion // Adjusted to 2012 dollars: U.S. $1.12 trillion 
7. Microsoft in 1999
   Value then: $620.6 billion // Adjusted to 2012 dollars: U.S. $851 billion
8. Apple in August 2012
   Value then: $661.6 billion // Adjusted to 2012 dollars: U.S. $661.6 billion 
9. Exxon-Mobil in 2007
   Value then: $513.3 billion // Adjusted to 2012 dollars: U.S. $572.9 billion