You have two problems...
1. A mixture of variable names between
obj
and
objdata
...You parse the JSON into
objdata
but try to display data from
obj
...
2. You JSON is an array(!) of objects, but you try to access it as a single object...
var data = '[{"CompanyName":"Crisil","POM_Name":"No Interview scheduled","RoundTime":"","Contactnumber":"","Contactperson":"","Address":""}]';
var obj = $.parseJSON(data);
alert(obj[0]['CompanyName']);