Maybe you could consider Instagram and Facebook two companies, but FB bought IG in 2012. They are really one company. Google has many subsidiaries, could they be considered separate?
Jack Dorsey does in fact control 2 separate Tech Companies, Twitter and Square. Not sure how Square could fit into the scheme though. Perhaps they buy access to data from other companies.
There are other possibilities I'm sure. If I had to guess, I'd say maybe only Google or one of the major telecoms would have the best capabilities to dig through data but Trump was also very active on the social platforms so...
Sussmann and Elias are known to associate with a tech guy named Zebley(sp?)