Earlier this month, Zillow Group Z, -1.18%, the popular online real estate data provider, reported blowout earnings. Revenue rose 32% compared to a year ago, and online visits were up 18%.

But there was a note of caution in its earnings release. In April, the company said, it had received a notice from the Consumer Financial Protection Bureau that questioned whether some of Zillow’s advertising revenues violated regulations against kickbacks.

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