This happens all the time. It is essentially the business strategy of many (not all!) conglomerates. Scoop up successful companies and let them keep running as

This happens all the time. It is essentially the business strategy of many (not all!) conglomerates. Scoop up successful companies and let them keep running as they are, sometimes with even greater success due to things like access to money and peers. I've worked for a few subsidiaries through the acquisition process, and aside from some accountants showing up once a year, everything remained the same.