advertisers

n. promoter, one who publicizes (generally in order to sell goods or services); person whose business is advertising; adman; one who publicly announces (also advertizer)

Advertising is paid, one-way communication through a medium in which the sponsor is identified and the message is controlled by the sponsor. Variations include publicity, public relations, etc.. Every major medium is used to deliver these messages, including: television, radio, movies, magazines, newspapers, video games, the Internet (see Internet advertising), and billboards.
See more at Wikipedia.org...

Noun
1. someone whose business is advertising
(synonym) advertizer, adman
(hypernym) publicist, publicizer, publiciser
(hyponym) huckster
(derivation) advertise, advertize, promote, push

clients placing paid for advertising.