Quiksilver (NYSE:

) shares tumbled 43.96% to reach a new 52-week low of $3.25 after the company posted a loss in the fiscal second quarter and issued a weak forecast. Quiksilver posted an adjusted loss of $0.15 per share on revenue of $408 million. However, analysts were expecting a loss of $0.02 per share on revenue of $449 million. Analysts at Stifel Nicolaus downgraded Quiksilver from Buy to Hold. Coach (NYSE:

) shares touched a new 52-week low of $40.14. Coach shares have dropped 30.95% over the past 52 weeks, while the S&P 500 index has gained 18.00% in the same period. The Ensign Group (NASDAQ:

) shares reached a new 52-week low of $26.99 after the company announced the completion of spin-off of CareTrust REIT and acquired two skilled nursing facilities in Colorado and Washington. Clovis Oncology (NASDAQ:

) shares reached a new 52-week low of $40.78 after falling 6.76% on Monday. Citigroup downgraded Clovis Oncologyfrom Buy to Neutral.