The chief super PAC helping Republican presidential candidate Marco Rubio raised more than $30 million last year, half of it in the last six months.
Conservative Solutions PAC shared its fundraising numbers ahead of a required filing Sunday with federal regulators.
Billionaire New York investor Paul Singer gave $2.5 million, making him one of Rubio's most generous supporters. In October, Singer wrote a letter to his friends encouraging them to back Rubio in the primary contests. Chicago-based investor Ken Griffin also gave $2.5 million shortly after announcing his support for Rubio in December.
Other seven-figure contributors include Florida auto dealer and longtime Rubio booster Norman Braman, financier Cliff Asness of New York and roofing company executive David Humphreys of Missouri.
Conservative Solutions PAC began the year with about $14 million left to spend.
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