Investors interested in Oils-Energy stocks should always be looking to find the best-performing companies in the group. Has Enerplus (ERF) been one of those stocks this year? Let's take a closer look at the stock's year-to-date performance to find out. Enerplus is one of 255 companies in the Oils-Energy group. The Oils-Energy group currently sits at #1 within the Zacks Sector Rank. The Zacks Sector Rank considers 16 different sector groups.