For the third month in a row, the biggest vendor to Trump's campaign was Giles-Parscale, the San Antonio Web firm of Trump's digital director, Brad Parscale. The company was paid $20.6 million for digital consulting and online ads, up from $11.1 million in August.

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Another $23 million went to Trump's television media buyers: $16 million to American Media and Advocacy Group, which shares an address with Virginia media firm National Media, and nearly $7.5 million to Jamestown Associates, where Trump communications director Jason Miller serves as an executive vice president. Rick Reed Media, which used to serve as Trump's main media firm, was paid just $66,000 for the month.

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One of the biggest new investments the campaign made was in voter data. It paid out $5 million to Cambridge Analytica, a data-analytics firm backed by Republican megadonor Robert Mercer. That's a huge increase over August, when the company was paid $250,000.

Trump's campaign lawyers continued to rake in large sums. Nearly $500,000 went to law firms, including $322,000 to Jones Day. And for the first time, Trump's campaign reported payments to pollster Tony Fabrizio, who has been working for the candidate for months. His firm Fabrizio, Lee & Associates received more than $623,000.

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In addition, former campaign manager Corey Lewandowski received his final severance, bringing his total payments in salary and bonuses to $515,000.

Trump's campaign directed another $1 million in reimbursements to Trump companies in September, including $757,434 to Tag Air; $19,114 to the Trump National Doral Golf Resort and $182,630 to Trump Tower. In all, the campaign has paid out $9.3 million to reimburse Trump and his companies.

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He has personally contributed far more than that. In September, he donated $2 million to his campaign, bringing his total in personal donations to $56 million. Trump has repeatedly said in recent weeks that he would put $100 million into his bid.

His campaign spent far more than it raised in September, reporting $53 million in contributions, including $33 million raised through two joint fundraising committees with the Republican National Committee. Clinton, by comparison, raised about $84 million for her campaign in September.