Take a look at some of Friday's midday movers:
Biota Pharmaceuticals - Shares plummeted after its influenza treatment failed to meet its main goal in a mid-stage study.
Boyd Gaming - The casino operator declined after posting weaker-than-expected second-quarter results.
Church & Dwight Co. - The maker of Arm & Hammer posted better-than-expected second-quarter earnings.
Clorox - The bleach supplier rose after tallying adjusted fourth-quarter profit that beat forecasts.
Fluor - The engineering company gained on better-than-expected second-quarter earnings.
Harley-Davidson - The motorcycle maker edged higher as it recalled more than 3,000 bikes to fix ignition switches.
Hewlett-Packard - The computer maker declined after the Justice Department said the company would pay $32.5 million to settle allegations it overcharged the U.S. Postal Service.
Mobileye - The Israeli maker of software for self-driving cars gained in its market debut.
Spirit AeroSytems Holdings - The maker of plane components jumped after raising its full-year forecast.
Starwood Hotels & Resorts Worldwide - The company gained after increased its stock buyback to $1.5 billion.
3D Systems - The provider of 3D printing fell after FBR Capital Markets downgraded its shares to market perform from outperform.
—By CNBC's Rich Fisherman.
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