Amazon is killing these 7 companies

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Sears   49 of 59

Business Insider/Hayley Peterson

Traditional retailers such as Sears are in danger as Amazon expands into new categories.

Amazon is on a roll.

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The company just celebrated the biggest day in its history with the 30-hour Prime Day that ended on Tuesday. According to Amazon, the event grew 60% since last year, though the company didn't provide specific sales figures.

However, when Amazon thrives, other companies often suffer. Even the mere rumor that Amazon is entering a new sector can cause potential rivals' stocks to plummet. On Wednesday, Zillow's stock dropped 3% following whispers that Amazon is building a real estate service of its own.

Here are seven companies that the ecommerce giant threatens: