It said the August haul left Harris with $404 million in cash on hand at the beginning of September.
Trump's campaign team said on Wednesday that it and the Republican Party raised $130 million in August, leaving $295 million cash on hand at the end of the month.
The two candidates will spend more than $1 billion in this campaign, breaking records, according to regulatory filings. Trump and Harris are using the money to run advertisements and build get-out-the-vote operations in the closely contested states that will decide the election.
The fundraising totals, which are reported to U.S. election regulators, are closely watched for signs of momentum ahead of the tightly contested Nov. 5 election.
The totals do not include the money raised by outside groups supporting each candidate.
A key test for both candidates will come at their televised debate on Tuesday, the first since President Joe Biden dropped out of the race and endorsed Harris as his successor on July 21.
Harris' candidacy has re-energized Democrats and donors, and she has had a surge in opinion polls.
Three-quarters of the 1.3 million new donors to Harris in August did not contribute in the last presidential election in 2020, her campaign said. It said more than six in 10 donors in August were women, and nearly one in five were registered Republicans or independents.
Nonetheless, polling averages show it is a tight race in the battleground states that will decide the election, including Pennsylvania, Michigan and Georgia.
