In June, shares of offshore-drilling contractors ENSCO PLC (NYSE: ESV), Atwood Oceanics, Inc. (NYSE: ATW), and Transocean PLC (NYSE: RIG) fell sharply. Shares of Transocean were down more than 13% at one point before recovering a small amount, and finished June down almost 9.5%. Both Atwood Oceanics and ENSCO finished June with their stocks down more than 17%.