I opened an S Corp on Mar 30th (CorpA). On Aug 1st, I amended the name & industry of the S Corp (to CorpB). Do I need to file two 1120-S for each of the names?

I think I only need to file one 1120-S since it was an amendment to the company name and industry with the same EIN, but I am not sure.  If I only have to file one 1120-S then it would be for CorpB, right?  All expenses and income since March 30th would go under the 1120-S of CorpB even though they are different industries?