Federal regulators are investigating the case of the missing “4,” exploring the numeral’s conspicuous absence in quarterly reports that could mean companies have improperly rounded up their earnings per share to the next highest cent.

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The Securities and Exchange Commission is investigating whether companies have engaged in improper rounding up of quarterly earnings, people familiar with the matter said. SEC enforcement officials have sent queries to at least 10 companies, asking the firms to provide information about accounting adjustments that could push earnings per share results higher, one person familiar with the matter said.

The queries follow the release of an academic paper that found evidence of companies nudging up earnings results. The academic research found the number “4” appeared at an abnormally low rate in the tenths place of companies’ earnings per share. Reporting that figure as “5” or higher allows a firm to round up its earnings per share another cent.

For instance, a company with earnings of 55.4 cents a share would round to 55 cents a share, while a company with earnings of 55.5 cents per share would round to 56 cents.

Public companies have strong incentives to report higher earnings per share, particularly those followed by Wall Street analysts whose quarterly forecasts are used to benchmark corporate performance. Investors often snap up shares of companies that beat expectations, even by a cent, and, likewise, sell shares of firms that miss their forecast.

The names of the companies that received the SEC’s demand couldn’t be learned. The SEC didn’t immediately respond to a request for comment.

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