BlackBerry delivered quarterly earnings that topped analysts' expectations on Friday.
Lululemon Athletica reported a slightly higher quarterly net profit on Thursday, helped by a 5 percent rise in comparable store sales.
KB Home's shares were up sharply after the company reported better-than-expected first quarter earnings on Friday.
Upscale jeweler Tiffany reported a 1 percent fall in quarterly sales, hurt by a stronger dollar and weak demand during the holiday shopping season.
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