India's top IT companies seem to be holding their breath - will the fate of Citigroup have a bearing on their top line too? That seems to be the question prevalent in the IT sector. Citi is the largest client for the largest Indian IT company TCS. It is also one of Wipro's top clients and other companies like Satyam, Infosys and Polaris. Oracle financial services have a sizeable chunk of their revenues coming from Citi, as well.