If we are to compare Wipro, Satyam, Infosys and Cognizant using google finance's share movement history with respect to ADR:
It would say most profitable company was Cognizant:
Here is how they are ranked:
- Cognizant - CTSH
- Satyam - SAY
- Infosys - Infy
- Wipro - WIT
Infosys and Wipro are almost hand in hand in terms of ROI. Have a look.