GOP presidential candidate Carly Fiorina raised $6.8 million during the last fundraising quarter, according to a Federal Election Commission filing released Friday -- a sizeable sum that was bolstered by her strong performances during the first two GOP presidential debates.

Her third quarter fundraising total puts her behind most of the top-tier candidates in the GOP field, led by the impressive $20 million raised by retired neurosurgeon Ben Carson and the $13.38 million raised by former Florida governor Jeb Bush. But the figure marks a sharp increase in donations from her second quarter haul, when she raised less than $2 million.

The FEC filing shows that Fiorina received a considerable spike in campaign funds following both of her debate performances, bringing in more than $300,000 within days after each event. Fiorina has also attracted significant amount in small donors -- individuals that give less than $200 to campaigns -- with almost half her third quarter haul coming from small donors.

Among her campaign's payees is Tusk Digital, a Washington, D.C. based digital and media consulting shop. The company was paid about $616,000 between June and September.

The former Hewlett-Packard CEO's campaign spent just $2.2 million during the third quarter, signaling a relatively low campaign dollar burn rate of just 34 percent. Her campaign has maintained a relatively lean operation with only 16 paid staffers on the payroll.

Fiorina held $5.5 million in cash on hand at the end of the reporting period on Sept. 30.