The haul is the largest fundraising quarter of the 2020 Democratic primary so far.
Additionally, the campaign said it received more than 1.8 million donations in the final quarter of the year.
Sanders raised $18 million in the month of December alone and brought in contributions from 40,000 new donors on the final day of the fourth quarter, according to his campaign.
The latest haul is roughly $9 million more than his third-quarter fundraising haul of $25.3 million.
Sanders's campaign manager, Faiz Shakir, highlighted the campaign's grassroots fundraising strategy in a statement Thursday.
However, Warren released a statement in late December urging supporters to give to her campaign.
The Massachusetts senator noted that she had raised $17 million, a "good chunk" behind what her campaign had raised in the previous quarter. »