Stocks Hitting 52-Week Lows

shares fell 5.37 percent to touch a new 52-week low of $4.58. On Tuesday, XenoPort reported Phase 2 study results for XP23829 as a potential treatment for patients with psoriasis.

shares reached a new 52-week low of $10.44. Freshpet's PEG ratio is -3.93.

shares reached a new 52-week low of $5.25 after the company issued a business update. The company amended its repurchase program and reported a new contract award.

shares touched a new 52-week low of $49.92. Markwest Energy Partners shares have tumbled 35.27 percent over the past 52 weeks, while the S&P 500 index has declined 1.17 percent in the same period.