Jeb Bush received more than $9 million in income since January 2014 by delivering speeches, sitting on boards of directors and helping to manage private investment firms, according to election disclosures filed on Tuesday.

The new figure represents another surge in personal wealth for Bush. The latest filing, combined with recently released tax returns, show Bush has received about $38 million in income since leaving the Florida governor's office in 2007. He filed his report in advance of the GOP's first primary debate on Thursday sponsored by Fox News.

As in other recent years, Bush made most of his money through a combination of speeches, seats on corporate boards and investments.

On Tuesday, he reported for the first time his income from private investment firms that he launched after reentering the private sector. As part owner and manager of Britton Hill Advisors LLC and DeSoto Partners LLC, he earned almost $1.2 million. Bush stepped away from the firms earlier this year as he prepared his run for the White House. Bush no longer has an ownership interest in the firms, according to the disclosure.

Bush gave 47 speeches over the period covered by the disclosure, netting more than $1.9 million in fees.

New Jersey Gov. Chris Christie and former Pennsylvania senator Rick Santorum, who are participating in presidential debates hosted by Fox news this week, also disclosed their income on Tuesday. The network, which is hosting both a prime time debate for the race's top tier and an earlier event for those below that mark, made release of candidate financial disclosures a requirement for participation in either of the faceoffs.

Christie's disclosure showed a state salary of $276,945 between January 2014 and July 2015.

In April, Christie's wife announced that she was stepping down from her post as managing director of an investment company, Angelo, Gordon & Co., but previously filed disclosures listed her salary as more than $500,000.

Santorum reported income of about $800,000, a large portion of which comes from speaking fees. He also received $178,305 from Echolight Studios, which produces faith-oriented movies.

Ambassador Agency, a religious speakers bureau, paid him $127,400. His wife also received an advance for a book from Thomas Nelson Publishing, the value of which is not reported in the filings.