When NBC was created in 1926, General Electric held a 30% share. RCA held the controlling share. GE purchased RCA in 1986 and gained the remaining control of NBC.

When NBC started, there were 2 networks, NBC Blue and NBC Red. Eventually, through antitrust lawsuits, NBC sold the Blue network to the guy who invented Lifesavers candy, and it was renamed ABC.

The original owner of the radio station that eventually became NBC was AT&T.

Source: What Else?