Investors interested in Utilities stocks should always be looking to find the best-performing companies in the group. Atmos Energy (ATO) is a stock that can certainly grab the attention of many investors, but do its recent returns compare favorably to the sector as a whole? Let's take a closer look at the stock's year-to-date performance to find out.Atmos Energy is a member of the Utilities sector. This group includes 106 individual stocks and currently holds a Zacks Sector Rank of #13. The Zacks Sector Ran ...