Author Ken Follett has given a £100,000 donation to Ed Balls' Labour leadership campaign, figures reveal.
The Electoral Commission still has shadow foreign secretary David Miliband as the best-funded candidate overall, raising £138,835 in July.
He was followed by Mr Balls on £103,000 and Ed Miliband on £46,450.
Andy Burnham received £12,400, including £10,000 from the Liverpool and England footballer Jamie Carragher.
No donations were recorded for the other candidate, left-wing MP Diane Abbott.
The figures come ahead of ballots being sent out at the beginning of September.
David Miliband's total for July is down from the £185,275 he raised in June, with notable donors including party fund-raiser Anthony Bailey, who gave £50,000 and "curry king" Goolam Noon, who gave £10,000.
He said: "I am very grateful for the generous support I've received since the start of the campaign. It's humbling that people are giving up both their time and their money to help me in my bid to become the next leader of the Labour Party."
Shadow energy secretary Ed Miliband's donations are up from £15,000 in June.
Under Electoral Commission rules, all gifts above £1,500 must be declared.
Ed Miliband's campaign also said it had raised almost £58,000 from smaller donors, with another 682 supporters giving an average of £85 each.
A spokesman said: "These figures show that the Ed Miliband campaign is gaining momentum at a crucial time in the campaign. The average size of donation shows that the rank and file members are backing Ed Miliband's message of change."
Mr Balls, the shadow education secretary, whose Electoral Commission-registered donations in June totalled £28,419, also received £3,000 from businessman Sir Trevor Chinn.
Mr Follett, the writer of novels including Eye of the Needle, is the husband of former Labour MP Barbara Follett.
The Electoral Commission said shadow health secretary Mr Burnham had doubled his donations from June's level and taken on a £10,000 loan from campaign manager Kevin Lee.
July's figures represent the second month in a row that Ms Abbott has not recorded any gifts to her campaign.
The result of the leadership contest will be announced on 25 September at the Labour Party conference.