I have tried the below code for open LinkedIn company profile in the native LinkedIn iPad app. It doesn't work.
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"linkedin://company?id=companyCode"]];
Try using this scheme:
"linkedin://company/companyCode"
So your code will be something like that:
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"linkedin://company/companyCode"]];