Former Gov. Angus King raised about $300,000 for his U.S. Senate bid in the past seven weeks, pushing his total over $470,000 in the first three months of his campaign.

State Treasurer Bruce Poliquin raised $229,214 during the same period, according to his campaign, likely making him the best-financed Republican contender with less than two weeks to go before the June 12 primary.

It’s not clear how much of Poliquin’s money was contributed by the candidate himself, however, because the campaign did not release its detailed financial report to the newspaper. Poliquin is a wealthy businessman who financed much of his unsuccessful run for governor in 2010.

The six Republicans and four Democrats running for Maine’s open U.S. Senate seat were required to file updated financial reports with the Senate by the end of the day Thursday. The filings cover the period April 1 through May 23 and are the last comprehensive look at fundraising and spending before the June 12 statewide primary.

Each candidate’s full campaign report will be posted online by the Federal Election Commission over the next week, although most of the candidates provided partial or full reports to MaineToday Media on Thursday.

King, who is running as an independent and not participating in the June 12 primary, filed a campaign finance report as well, although it wasn’t clear he was required to.

The financial reports indicate which candidates have the cash to mount media campaigns in the last week of the primary campaign, and whether their money is coming from out-of-state PACs or working Mainers. They also become part of the campaign spin cycle, with some candidates releasing the numbers they want to and withholding the others until the full reports are posted online.

“This is such a hotly fought (primary) contest, especially on the Republican side,” said Emily Shaw, assistant professor of political science at Thomas College. “It make sense that if they can control the message, they will do that. This is not small ball.”

Poliquin, for example, may have withheld his fundraising details because of questions about whether his campaign is self-funded.

Poliquin’s campaign said the candidate did contribute to the campaign, but did not say how much. Candidates can contribute as much as they want, while other individuals are limited to $2,500 for the primary election campaign and $2,500 for the general election.

Former Maine Senate President Rick Bennett is the other top Republican fundraiser, pulling in a total of $184,303 for his campaign by May 23. He spent $64,037.19 in the latest reporting period and had $117,211.81 in cash on hand as of May 24, according to the campaign.

Bennett and his wife each donated only $2,500 to his run, according to his campaign. It did not provide the complete report on donations and expenses, however.

Both Bennett and Poliquin now have television and radio advertisements airing across the state.

Two other Republicans, Attorney General Bill Schneider and Secretary of State Charlie Summers, also have raised enough money to hit the airwaves with television ads. Both released their full financial reports Thursday.

Schneider raised a total of $76,222.78 from the start of his campaign through May 23. He spent $43,453.02 during the latest reporting period and had $29,159.04 in cash on hand as of a week ago, his report says.

Summers gained fundraising momentum in April and May, and raised a total of $89,915 as of May 23. Summers spent just $4,778.31 during the latest reporting period and had $85,136.69 in cash on hand as of May 23, the report says. He spent a chunk of that cash on a television ad that began airing this week, however.

Maine Senate Assistant Majority Leader Debra Plowman, another Republican, said she raised $20,160 between April 1 and May 24, giving her a more modest total of $25,422.

Plowman spent $15,064 during the latest reporting period, and had $9,956 in cash on hand as of May 24, she said. Plowman, who has run Republicans’ only all-volunteer campaign, has bought radio ads but won’t have the cash for TV, she said.

The sixth Republican in the race, conservative activist Scott D’Amboise, did not provide his latest fundraising numbers Thursday. D’Amboise has been campaigning for more than a year and still leads all Republicans in money raised, with $609,831 as of March 31. D’Amboise may have little money left to mount a last-minute media campaign, however, because much of his money was spent to renting mailing lists of wealthy donors.

The money chase in the Democrartic primary is less clear.

State Rep. Jon Hinck, D-Portland, was the only one of the four Democrats to provide fundraising numbers Thursday.

Hinck had raised a total of $111,083 as of May 23, according to a partial report provided by his campaign. He spent $21,970.60 during the seven-week period ending May 23. He had $7,988.96 in cash on hand as of last week, the report says.

Former Secretary of State Matt Dunlap and Maine Sen. Cynthia Dill, D-Cape Elizabeth, both of whom trailed Hinck in the last fundraising cycle, did not provide any fundraising numbers Thursday.

The fourth Democrat, Benjamin Pollard, said he did not have the report ready and intended to file late.