Technology giant IBM has ranked numero uno in terms of supercomputers installed in the country, with six such sites, a report by the Indian Institute of Science (IISc) today said.As per the "India's Top Supercomputers list for 2011", complied and published by Supercomputer Education and Research Centre (SERC) of IISc, IBM topped the list with six high performance computing (HPC) installations across India.Of the 16 installations featured by SERC, HP was at the second spot with five installations and SGI had two systems."At IBM, we deliver powerful and innovative high performance computing solutions to meet our clients' most challenging and complex problems.These solutions enable businesses and researchers to innovate, achieve breakthrough results and establish a sustainable competitive advantage in a Smarter Planet," IBM India/SA Executive (Deep Computing, Systems and Technology Group) Subram Natarajan said.IBM's installations include IISc, Bangalore, India Meteorological Department, Delhi and the Indian National Centre for Ocean Information Services (INCOIS), Hyderabad.SERC has been publishing the list in India since December 2008.