Midday Losers From October 28: Twitter, Kohl's, Amkor Technologies And More

Amkor Technologies, Inc. AMKR -17% - The company reported downbeat earnings after Monday's close; Credit Suisse lowered the price target to $8 per share.

Sanofi SA (ADR) SNY -10% - The company reported slightly lower earnings and warned that pricing pressure in the U.S. could impact diabetes-drugs sales throughout 2015.

Twitter Inc TWTR -10% - The company reported earnings in-line with Street estimates, but offered weak guidance. Multiple firms negatively adjusted the investment ratings and price targets on shares.

Medidata Solutions Inc MDSO -8% - The company missed earnings on both the top and bottom line, guided FY 2014 revenue below estimates.

Kohl's Corporation KSS -7% - Late Monday, the company offered financial guidance. Kohls sees comparable sales to decrease 1.4 percent in the third quarter and anticipates 2014 diluted EPS to be on the low end of the previous guidance range.