Hedge fund billionaire gives $2.5 million to Rubio super-PAC
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Billionaire investor Paul Singer gave $2.5 million to a super-PAC supporting Sen. Marco RubioMarco Antonio RubioSenate GOP attempts to wave Trump off second Putin summit GOP senator: We should accept Trump's 'apology' for Russian election interference comments Controversial Trump judicial nominee withdraws MORE's (R-Fla.) presidential bid, according to documents sent to reporters by the group on Sunday.

The contribution to Conservative Solutions came in late November, almost a month after it was reported that the hedge fund manager would be supporting Rubio.

Singer is a longtime Republican donor and the founder of hedge fund Elliot Management Corporation. According to Forbes, he is worth $2.1 billion, making him the 327th-richest American.

Filings from the super-PAC also show that another hedge fund manager, Kenneth Griffin, head of investment firm Citadel, contributed $2.5 million in the latter half of 2015.

Florida auto dealer and longtime Rubio patron Norman Braman, meantime, contributed $1 million to the super-PAC during that period, bringing his total contributions to $6 million.

During that period, the committee hauled in a total of $14.4 million, mostly in large contributions. The group raised $30.3 million over the entire year.

But in the last six months, the super-PAC's fundraising was outpaced by its spending. It burned through $16.4 million over that period, spending millions on ad buys in Iowa and New Hampshire.

Still, due to its strong early fundraising campaign, Conservative Solutions started 2016 with $14 million cash on hand to spend as the primary season begins.

--This report was updated at 3:32 p.m.