From an April 18 Politico article:

Newt Gingrich, who has toyed with a possible 2012 White House bid, raised nearly $2.7 million in the first three months of the year for his political committee - almost as much as the groups headed by his prospective rivals for the 2012 Republican presidential nomination, Mitt Romney, Tim Pawlenty, Sarah Palin and Mike Huckabee, brought in combined.

[...]

And American Solutions took full advantage of its fundraising flexibility in the first quarter, accepting 10 checks of $15,000 or more, including some from companies whose interests overlap with the issue advocacy portfolio pushed by American Solutions.

For instance, this year, the group accepted $250,000 from Devon Energy Corporation, an Oklahoma natural gas and oil producer, and $100,000 from Arch Coal of St. Louis, according to a filing this month with the Internal Revenue Service, detailing its contributions and expenditures for the first three months of the year. American Solutions has aired ads opposing proposals to limit carbon emissions and establish a market on which pollution allowances could be traded, and also has pushed for increased domestic oil production.

[...]

Romney's PAC, Free and Strong America, brought in $1.6 million and contributed $52,000 to federal candidates and committees in the first three months of the year. Pawlenty's Freedom First PAC tallied $568,000 and contributed $27,000. Sarah Palin's PAC raised $400,000 and contributed $9,500, while Huckabee's Huck PAC brought in $273,000 and contributed $13,500.

Gingrich also started a PAC called American Solutions late last year, but it has been relatively inactive, raising only $11,000 in the first three months of the year and contributing $2,000.

Previously:

FoxPAC -- Fox News hosts and contributors raise big bucks for GOP