Shares of Perion Network (NASDAQ: PERI) were tanking today after the company's relationship with Microsoft took another step back, crushing a key source of revenue for the ad tech company.

As a result, Perion slashed its revenue guidance again, following a guidance cut for the same reason, and the stock was down 28.4% as of 11:15 a.m. ET on Monday.

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Source Fool.com