Investors interested in Utilities stocks should always be looking to find the best-performing companies in the group. Has Atmos Energy (ATO) been one of those stocks this year? A quick glance at the company's year-to-date performance in comparison to the rest of the Utilities sector should help us answer this question.Atmos Energy is a member of our Utilities group, which includes 104 different companies and currently sits at #10 in the Zacks Sector Rank. The Zacks Sector Rank considers 16 different groups, ...