Preliminary bids were put in last week, according to Reuters, with interest coming from private equity firms and rival companies of InfoGroup, which is based in Omaha, Nebraska.
On Saturday the Omaha World-Herald reported that at least 33 potential bidders are reviewing the company's finances.
B2B data firm Dun & Bradstreet is understood to have put in a bid for InfoGroup.
Sources said that Acxiom, which has operations around the world including the UK, had also submitted a bid, but the company denied this to Reuters.
Acxiom is strong in consumer data provision but not in InfoGroup's core area, B2B data.
InfoGroup's third-quarter sales declined, but net profits rose. It had sales of $125 million, down from $145 million in last year's third quarter.
Net profits totalled $4.8 million, compared with a loss of $8.7 million in the year-earlier period.
InfoGroup has experienced a turbulent two years. In 2008 InfoGroup settled a shareholder lawsuit by imposing tighter limits on spending and removing founder Vin Gupta from the CEO job.
Last month InfoGroup said it had reached a tentative agreement with the Securities and Exchange Commission regarding an investigation of the company's spending and records that began nearly two years ago.
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