Among them were investments in gaming companies, including Ameristar Casinos and Harrahs Entertainment. Romney has been eager to present himself as the most socially conservative candidate in the field, decrying what he has said is the debasement of the culture.

The report also highlights a continuing connection between Romney and Bain Capital, the venture capital firm he founded and which he left in 1999 to assume leadership of the Salt Lake City Winter Olympics. Romney ran the 2002 Winter Olympics in Salt Lake and then was elected governor of Massachusetts later in 2002.

Earlier this year, Romney played down any lingering connection with Bain Capital after The Associated Press reported that Bain Capital and Bain & Co., the management consulting firm where Romney used to work, had links to Iranian business interests. At the time, a spokesman highlighted Romney's 1999 resignation from Bain, while Romney himself said his divestment call applied only to future activity, not past dealings.

A notation in Romney's filing, however, says that under a noncompete agreement with Bain Capital, Romney retains a "passive profit share as a retired partner in certain Bain Capital entities formed on or prior to Feb. 11, 2009."

A note in Romney's report states that Romney asked for a listing of Bain's underlying holdings, but, like other funds in his blind trust, the fund managers said the information was confidential and declined to provide it.

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Contributing: Suzanne Struglinski, Deseret Morning News.