Dan Dorfman, a highly visible financial journalist whose televised market reports could send a stock soaring — or plummeting — but whose career was tarnished by accusations of insider trading, died on Saturday in Manhattan. He was 82.

His death, at NewYork-Presbyterian Hospital/Weill Cornell Medical Center, was confirmed by the Riverside Memorial Chapel in Manhattan. The cause was cardiogenic shock, a heart condition, his family told The Associated Press.

A scrappy, Runyonesque figure who spoke a breathless Brooklynese, Mr. Dorfman was for much of the 1990s considered the most influential stock tipster in the country. He was best known as the host of the series of three-minute market reports that CNBC broadcast over the course of each trading day.

Long before that, Mr. Dorfman had been an influential voice in business journalism. In the late 1960s and early ’70s he wrote The Wall Street Journal’s stock column Heard on the Street. He later wrote New York magazine’s Bottom Line column, Esquire’s Full Disclosure column, a nationally syndicated column for The Daily News of New York and a column for USA Today.