Stocks making the biggest moves midday: Instacart, Disney, Planet Fitness, Rackspace and more

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[unable to retrieve full-text content]Instacart — The grocery delivery stock roared out the gates as it debuted on the public market midday Tuesday. Shares popped about 35%. The company had priced its IPO at $30 a share on Monday, the high end of the expected $28 to $30 range.