Pedestrians are reflected in the window of an Abercrombie & Fitch store in New York.
Craig Warga | Bloomberg | Getty Images
Small-cap stocks are on a winning streak, and Jefferies thinks they have more room to run.
The Russell 2000, which is made up of small-cap names, is up roughly 1.7% in June. It's on track for its first-ever nine-month winning streak.