Morning Market Movers

GAIN Capital Holdings

shares jumped 23.69% to $8.72 after the company announced its plans to acquire City Index for $118 million and announced strong preliminary Q3 results. YRC Worldwide

shares gained 22.80% to $22.35 after the company reported a Q3 loss of $0.03 per share on revenue of $1.32 billion. Deutsche Bank upgraded YRC Worldwide from Hold to Buy and raised the price target from $22.00 to $24.00. Imperva

shares surged 21.89% to $39.59 after the company reported better-than-expected Q3 earnings. WisdomTree Investments

shares rose 19.58% to $14.00 after the company reported Q3 earnings of $0.08 per share on revenue of $47.10 million and announced a $100 million share repurchase authorization. Novadaq Technologies

climbed 17.52% to $15.56 after the company announced the transfer of SPY Elite business from LifeCell Corporation for $4.5 million GoPro

shares jumped 16.56% to $79.55 after the company reported better-than-expected third-quarter results and issued a strong forecast for the fourth quarter. Silicon Image

shares surged 16.56% to $5.35 after the company posted a profit in the third quarter. Spansion

shares rose 16.24% to $19.22 after the company reported a Q3 loss of $0.18 per share on revenue of $315.90 million. Zendesk

gained 16.01% to $26.95 on Q3 results. Sarepta Therapeutics

shares jumped 12.02% to $17.62 on publication of the FDA letter. Groupon

gained 10.85% to $6.64 after the company reported stronger-than-expected third-quarter earnings and lowered its fourth-quarter forecast.