Auckland mayor Phil Goff has nearly $200,000 left in his campaign kitty, after raising far more than he needed to win October's election.
Election returns show Mr Goff raised $604,171, but spent only $410,814 to win comfortably.
The leftover money remains available for him to use in a future campaign.
Mr Goff's nearest rival Vic Crone spent $232,216, leaving her with an $11,000 shortfall.
John Palino spent $80,774, Mark Thomas $46,782, and third-placed Chloe Swarbrick just $8369.
Mr Goff's biggest boost came from the auction of a book signed by the Chinese Premier, which sold for $150,000 to a locally based investment company, Hong Tai Chi.
He received $50,000 from Fuh Wah, which is building a waterfront hotel, and $5000 donations from former Prime Minister Helen Clark, businessman Eric Watson, and the E tū trade union.
Ms Crone's biggest supporters were HWM Holdings, owned by Peter Huljich, with $50,000, Fran Wyborn with $45,000, the centre-right political group Auckland Future with $18,500, with National Party president Peter Goodfellow chipping in $10,000.
Mr Thomas' return shows only one donation over the $1500 declaration threshold.
Mr Palino's biggest backer was apartment developer XCJ Group, with $28,000, and Mr Palino himself contributed a similar amount.
On a value-for-money basis, third-placed Ms Swarbrick was the clear winner, with each of her 29,098 votes costing just 28 cents.
Mr Thomas spent $4.88 for each voted received, Mr Palino $2.81, Mr Goff, $2.18, and Ms Crone $1.98.
The returns identify all donations over $1500, and all spending inside the three-month official campaign period.