WASHINGTON — Mitt Romney’s campaign has directed $134.2 million to political firms with business ties to his senior staff, spotlighting the tightknit nature of his second presidential bid and the staggering sums being spent in this election.

Nine firms that are run by, or recently employed, top Romney aides have received almost a third of the $435.8 million that Romney’s campaign and a related fundraising committee have spent on operating expenses through Oct. 17, according to a Los Angeles Times analysis of federal election finance reports.

President Barack Obama’s re-election campaign and a joint fundraising committee have paid about $5.8 million in consulting fees to companies with business ties to senior strategists, according to the finance reports.

The campaign finance reports show that this year’s presidential race has created a huge economic stimulus package for campaign operatives, whose total payday is often undisclosed.

Ryan Williams, a Romney spokesman, said payments to firms with connections to staff members were not only for consulting, but also were used to purchase a variety of services, including “polling, video production, political mail, get-out-the-vote phones, online advertising, website development, and budget and compliance management, among other things.” He declined to break down the specific amounts.

It is unclear from the finance reports how much the firms may be earning on commissions for producing or buying Web ads, among other tasks.

In its analysis, the Times did not include millions of dollars that both campaigns have paid consultants to buy airtime for commercials, money that is largely passed on to television and radio stations.

Obama and Romney are on track to raise $1 billion each for their campaigns and political parties this election. The record-breaking totals stem from a decision by the candidates to reject public financing, which would have capped their general election spending at less than $92 million.

“These guys are spending as much in two weeks as we were spending in two months,” said Democratic consultant Tad Devine, who served as a senior strategist on the presidential bids of then-Vice President Al Gore in 2000 and Massachusetts Sen. John Kerry in 2004.

An examination of finance reports shows that Romney and Obama lean on trusted advisers to provide major services, such as media, polling and direct mail. But the Romney campaign has gone further, building its operations around a small group of companies that are either run by senior campaign aides or had employed them until they joined the campaign.

Two companies that Romney finance chairman Spencer Zwick controls — SJZ and VG — have together been paid more than $22 million, which the campaign reported as payments for fundraising consulting.

VG, which stands for Victory Group 2012, was incorporated in April, the same month Romney secured the Republican presidential nomination. The company was registered by a corporate services agent, but campaign officials confirmed it belongs to Zwick. SJZ dates to 2005.