Since, NBC Universal is now owned by not only GE but also Comcast, on the NBC website it now directs users to go to the Comcast Investor relations site in order to get the information. NBC is a publicly traded company.
According to the comcast investor relations site, "Comcast was first incorporated in the state of Pennsylvania in 1969. Comcast's Initial Public Offering (IPO) was on June 29, 1972. On that date 430,000 shares of CMCSA were issued at $7 per share. On November 18, 2002, Comcast and AT&T Broadband combined to form the new Comcast Corporation."