Ranked by viewership: 1) FoxNews 2) MSNBC 2) CNN. CNBC is another cable operator owned by NBCUniversal, but focused on business news.

— FOX news’ parent NewsCorp is merely the 5th largest media company, behind Sony, ViacomCBS, TimeWarner, Disney
— MSNBC: microsoft shareholding gradually disappeared. Now owned by NBCUniversal
MSNBC beat CNN in total primetime viewers
— CNN.. was the first cable news network
CNN beat MSNBC (but trailed first place Fox News Channel), in total daytime viewers

==== the big3 television networks: ABC, CBS and NBC. These are general purpose TV channels, often covering politics, entertainment (sports). They cover business but not as much as the dedicated financial news channels

==== television network vs cable network?
I guess television programs are broadcast over the air and can be received by antenna, but cables are the medium for cable news.

Nowadays, all of them are available via cable or fiber.