WASHINGTON — Republican presidential candidate Mitt Romney's vast wealth is spread over a dizzying array of foreign and domestic investments that at times have been sold to avoid conflicts with his public stances, the trustee of his blind trust said Monday.

Among the investments sold by trustee R. Bradford Malt were holdings in companies known to have interests with Iran, including French and Italian oil companies. Romney earlier this year called for state pension systems to divest themselves of Iran-related stocks.

Romney and his wife, Ann, hold assets worth between $190 million and $250 million, his advisers said. The campaign released details of his wealth Monday in a personal financial disclosure report filed with the Federal Election Commission and the U.S. Office of Government Ethics. The value of assets in federal financial reports are listed in ranges, making a precise figure impossible to discern.

Romney reported that he and his wife have joint interest checking accounts with Bank of America of between $5 million and $25 million and a money market account between $1 million and $5 million.

Romney is by far the wealthiest candidate in the presidential field. He has already lent his presidential campaign nearly $9 million, but based on the report field Monday, he could certainly lend more. Based on ranges listed in the report, the Romneys made between $100,000 and $1 million in interest on a money market account alone.

Both Romney and his wife also have Individual Retirement Accounts. But the bulk of their money is in two blind trusts, which Malt said are divided evenly between husband and wife.

Blind trusts are designed to prevent public officials from controlling their investments, thus avoiding potential conflicts of interest. Under federal rules, the Romneys were not required to report a blind trust in the name of their children, which aides say is valued at about $100 million. The Romneys have five sons, all of whom are married.

Presidential candidates had been required to file their financial disclosures by May 15, but Romney asked for two 45-day extensions to obtain detailed values of his and his wife's blind trusts.

The delay allowed Romney to file two days after the Iowa straw poll, a nonbinding but politically significant rite of passage in a state that holds the first presidential caucus. Romney won the straw poll with 31.5 percent after spending generously in the state on ads and mobilizing supporters. Candidates often buy the tickets that allow straw-poll participants to vote for them.