While metals major Sterlite Industries raised $1.5 billion through American depository shares (ADSs) last week, steel maker Tata Steel raised $500 million through a global depository receipt (GDR) issue.

Wind energy company Suzlon has also announced plans to raise $108 million through the GDR route.

QIPs are capital raising tools through which companies allot shares or any other security to institutional investors to raise funds. The money raised is in rupee denomination.

ADS and GDR are negotiable securities listed on another country's stock exchange. Subscription to the same gives the company funds in dollars or some other foreign currency.