How many major Hillary Clinton donors does it take to fill the Plaza ballroom?

The ornate space won't fill them all, according to a new report, leaving some contributors venting that they are being excluded from an upcoming 'thank you' party for backers of the Democrat's ultimately doomed effort against Donald Trump.

Among the major donors expected to attend are Anna Wintour, Harvey Weinstein, Marc Lasry, Alan Patricof, Page Six reported.

But other donors who helped Clinton and pro-Clinton superpacs raise more than $1 billion aren't all making the grade.

Some of them are calling Clinton staffers to complain about not being included, The Washington Post reported.

HIllary Clinton is holding a 'thank you' event for donors of her failed campaign at the Plaza Hotel in New York

The event, top be held at the Plaza Hotel's grand ballroom, is for the upper echelon of donors, like those who raised in the hundreds of thousands of dollars for Clinton's effort.

The elegant ballroom is 6,800 square feet, and dates to 1907. It was home to the storied 'black and white' ball that Truman Capote hosted for 540, the hotel boasts on its web site.

Many of Clinton's donors believed they were investing their time in a venture that was bound to be successful. In the weeks before the elections, a number of stories appeared about potential cabinet officials who would serve in a Clinton administration.

Hillary Clinton is holding a 'thank you' event for major donors in New York December 15

Clinton finance chair Dennis Cheng credits major donors with raising up to half of the $1 billion brought in for Clinton's ultimately unsuccessful effort

Holiday decorations at The Plaza Hotel on November 24, 2016 in New York City

The web site OpenSecrets.org complied a list of 1,129 bundlers who raised more than $112 million for Clinton.

Trump didn't disclose the people who bundled funds for his campaign.

Invitations went out last week. Left-out donors were told that space constraints were the problem, the Washington Post reported.

Clinton has kept a low profile since she lost the November 8 election. She has been spotted on hikes and in stores by supporters who took selfies and posted them online.