Editor's note: This story has been updated throughout.

Ted Cruz's presidential campaign raised $20 million in the fourth quarter of 2015, an aide confirmed Wednesday evening.

The haul is Cruz's biggest yet by far, bringing his fundraising total to more than $45 million since he launched his campaign. Cruz raised $12 million in the third quarter and $14 million in the first and second quarters combined.

It is unknown how Cruz's haul in the fourth quarter stacks up to those of his rivals, none of whom have announced their totals yet. The fourth quarter does not end until Thursday, and candidates are not required to disclose their campaign finances until next month.

Retired neurosurgeon Ben Carson led the Republican field in fundraising last quarter, raking in $20.8 million. After Cruz's announcement Wednesday evening, Carson spokesman Doug Watts would only say that Carson's fourth-quarter haul was "greater than" what he raised during the previous quarter.

In a memo announcing the $20 million haul, Cruz campaign manager Jeff Roe boasted that the Texas senator has "a network in place with the resources required to win that is the envy of every other campaign."

"Some campaigns are focused solely on a man, some on a movement," Roe wrote. "Ours is a hybrid of the two built to win."

The Cruz campaign has raked in 670,000 donations from more than 300,000 supporters who have given just over $67 each on average, according to the memo. The donors hail from just under two-thirds of all ZIP codes across the country, and 10,000 of them are "sustainers" who have agreed to automatically contribute on a monthly basis.

Cruz's campaign on Wednesday evening did not disclose another key measure of fundraising, how much money he has in the bank heading into the next quarter. He ended the third quarter with $13.8 million cash on hand, the most in the GOP field.

The Wall Street Journal first reported Cruz's fourth-quarter numbers.