Please take a look at this document - report created by the placement team at IIT Madras for 2022-23. This 45 page report has the answers to all your placement related questions! We also asked MS students about their opinions on MS placements at IIT Madras. They said that almost 70% of students in a particular MS batch sit for placements depending on the expected completion of their research work. Sometimes, 30-40% choose to pursue a PhD with almost 20% of that group converting to a direct PhD at IIT Madras!
Generally, students are more than satisfied with core and non-core companies. Start-up culture is also a predominant phenomena amongst MS scholars with students often expanding their research projects into start-ups!