Pursuits

For Shake Shack and Box, A Harsh Post-IPO Reality Sets In

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Less than two months after their soaring stock market debuts, Shake Shack Inc. and Box Inc. are facing the reality of what it means to be a public company.

Shares of the burger chain and cloud-storage company tumbled Thursday after each reported quarterly earnings for the first time since their initial public offerings, with Box falling as much as 18 percent. The declines came even though both companies reported sales that were higher than expected.