UnitedHealth Group Inc. (UNH - Get Report) plans to acquire Equian, a payments processing company, for $3.2 billion according to a published report late Thursday.

The insurer is purchasing the company from private equity firm New Mountain Capital, The Wall Street Journal reported, citing people familiar with the matter.

Equian provides payment-processing for insurers and health-care companies and seeks to reduce overpayments, according to the report.

Shares of UnitedHealth fell $2.43, or 0.97%, to close at $247.76, ahead of the report. The stock was little changed in after-hours trading.  

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