Republican presidential candidate Jon Huntsman listed between $15 million and $66 million in personal assets in a government filing released Friday.

The former Utah governor has extensive holdings worth between $5 million and $25 million in Huntsman Corp., the family chemical company started by his billionaire father, Jon Sr.

Huntsman has already given up to to $2 million to seed his campaign and may have to rely further on his personal wealth if his candidacy doesn’t attract more momentum. Huntsman’s wealth puts him behind Mitt Romney's $264 million in assets but well above many other GOP candidates.

The Huntsman campaign has been mired in the low single digits in polling throughout the Republican nomination contest. Huntsman has run toward the ideological middle, hoping to appeal to independents who can vote in open primaries like those in New Hampshire.

The candidate’s family has already started a super PAC, which is not subject to the $2,500 legal limit on direct donations to campaigns. His media consultant, Fred Davis, resigned from the campaign to join the family’s Our Destiny PAC .

The candidate’s assets include various investment accounts and a defined-benefit pension plan worth $250,000 to $500,000.

Huntsman’s top sources of income for the previous 20 months included $100,000 to $1 million from renting real estate in Coronado, Calif. , off the coast of San Diego, and $1 million to $5 million in dividends from Huntsman Corp., according to the filing.