GE CAPITAL this week is embarking on an elaborate advertising campaign with Slate.com featuring a six-month roadshow across the United States meant to stimulate its lending to midsize businesses.

According to research done by the National Center for the Middle Market at Ohio State University, businesses with revenue of $10 million to $1 billion account for more than 43 million jobs in the United States and one-third of the national private sector gross domestic product. GE Capital underwrites the center, founded in 2011. Steven Winoker, who follows General Electric for Sanford C. Bernstein & Company, called lending to middle-market businesses a “profitable business and a core business” for GE Capital, adding that it was “probably better at originating this kind of business than its competitors because of its industrial heritage.”

According to Mr. Winoker, GE Capital generated 47 percent of total earnings for General Electric last year, up from 28 percent in 2009; he also said commercial lending and leasing — a large part of which is to midsize businesses — was responsible for about a third of GE Capital’s profit last year.

Mr. Winoker said G.E. generally had a “more advanced view of advertising and marketing and is more aggressive in its approach to marketing than most industrial companies, from its heritage of owning” NBC Universal, whose sale to Comcast was completed last year.