Andrew Yang raised $16.5 million from October through December, a demonstration of his surge in enthusiasm for and national attention directed toward his outsider campaign.

The sum is $6.5 million more than Yang’s $10 million third-quarter haul, bringing his total number of individual campaign donors to 400,000 and average donation size to $30. His campaign did not reveal its cash-on-hand but said that the fundraising surge would allow the campaign to place television and digital ads, campaign staff, and infrastructure in early nominating contest states.