Magnate: the Knickerbocker Club by Joanna Shupe

A smart, ambitious woman who is not interested in the typical woman’s role in high society, develops a special talent for picking stocks; but because of the restrictions of the time, she must enlist a man to back her trades.  There is a young man who could help. He climbed his way up from the slums and now heads a steel empire – but he is disdainful of vacuous society women.

"I couldn’t resist another historical romance set in a slightly unconventional time—The Gilded Age in New York City. I can’t remember reading very many romances set in this era, if I’ve even read one. I’m super intrigued by the description—a rebellious blue-blood who wants to play the Stock Market and the self-made man from the slums who agrees to help her experience, ahem, sparks. It sounds delightful. I’m ready to be delighted." -- Ang