Mike Bloomberg spent more than $1 billion on his failed presidential campaign, according to filings on Monday.

The former New York City mayor ended his bid on March 4 but spent $176 million that month anyway, according to a campaign finance report filed with the Federal Election Commission.

That set his roughly four-month campaign’s spending at more than $1.2 billion.

The media mogul, who is estimated to be worth $55 billion, won only one primary — in the tiny island territory of American Samoa, and pocketed just 55 delegates.

Some campaign staffers have filed suit against Bloomberg for allegedly reneging on a promise to pay them through the general election, even if he weren’t the nominee.