BCA Partner Finance said strong demand in the used car market meant it was financing 500 units a day throughout January.
It now provides 1,300 customers with finance facilities for used vehicle stocking.
BCA said penetration of BCA sales reached 9% in January, and the operation is on-track to fund more than 75,000 units during the current financial period.
Malcolm Thompson, managing director of BCA Partner Finance, said: "The strength of the used vehicle market coupled with an investment in innovation has seen our service offering grow rapidly.
"We have experienced a busy start to the year and expect February and March to be exceptional months for our stock funding business."
NextGear Capital UK said it, too, had a record start to 2017, funding over 8,000 wholesale vehicles for its dealer customers in January, with an expectation of funding a total of more than 100,000 vehicles this year.
Launched in 2014, NextGear Capital UK now supports 1,160 dealers with finance.
David Mercer, managing director of NextGear Capital UK: said: "We are helping dealers to grow their businesses by using our Stocking Plans to fund vehicles from auction and wholesale sources, freeing up their own capital.
"In 2016, we funded over 71,000 vehicles and our field-based team of 23 specialists support dealers to make the most of their Stocking Plan, helping them to operate even more profitably. Our growing team in Chester moved into new, larger offices in 2016, having outgrown our original premises."
Source: www.bing.com