A single-engine plane on its way to Atlanta spun out of control over northern New Jersey and crashed onto a busy highway on Tuesday, killing all five people aboard — two investment bankers, and the wife and two children of one of the bankers.

No one on the ground was injured, the authorities said, though the plane, which crashed on Interstate 287 in Harding Township, in southern Morris County, almost hit a southbound pickup. A dog aboard the plane was also killed.

They did not officially identify the victims, but Greenhill & Company, an investment bank based in New York, said it believed that two of its managing directors, Jeffrey F. Buckalew, 45, and Rakesh Chawla, 36, were aboard the plane, as were Mr. Buckalew’s wife, Corinne, their son, Jackson, and their daughter, Meriwether.