An auctioneer takes bids for Edvard Munch's "The Scream" in New York in May 2012. "The Scream's" mystery buyer has been revealed to be Leon Black, an American financier.

U.S. billionaire Leon Black is the mystery buyer who paid a record $120 million for Edvard Munch's masterpiece "The Scream" at Sotheby's in May, the most expensive work of art ever sold at auction, the Wall Street Journal said on Wednesday.

Citing several sources close to Black, a New York businessman and avid art collector, the newspaper said his intentions for the iconic painting and whether it would be loaned to a museum were unclear.

A spokesman for Sotheby's declined to comment on the report. Black could not be reached and his spokesman also declined to comment.

Black, the lead partner of Apollo Global Management and No. 330 on Forbes list of billionaires, sits on the boards of both the New York Metropolitan Museum of Art and the Museum of Modern Art.

A Sotheby executive took the winning bid at the May 2nd sale in New York. It was one of an initial group of seven bidders who drove the price up during a feverish auction.

"The Scream," Munch's masterpiece from 1895 depicting a bald figure with hands pressed to the head and swirling colors in the background, is one of the world's most famous paintings. Three other versions, including two that were stolen and later recovered, are in museums in Norway.

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Leon Neal / AFP - Getty Images

Joan Miro's "Peinture (Etolie Bleue), 1927" sold at Sotheby's for $36,946,396.

Sotheby's set a new auction record for Spanish artist Joan Miro on Tuesday when his 1927 painting "Peinture (Etoile Bleue)" fetched $36.9 million, but elsewhere the sale failed to meet expectations.

Overall, the auctioneer raised $117.7 million at its impressionist and modern art evening sale in London, just beating the low estimate of $114.9 million but falling short when buyer's premium is taken into account.

The auction was the first in a busy season of sales of fine art in London which, if the highest expectations are met, could raise up to $1 billion.

But it painted an uncertain picture, with the New York Times describing proceedings on the night as "lackluster" and "bumpy."

Confidence in the art market has been sky high in 2012 despite broader economic concerns, with emerging collectors from Russia, China and the Middle East helping push values to record highs as they seek to snap up the most coveted works.

On offer at Sotheby's was one of Miro's most important paintings, and the previous auction record for the artist of $26.4 million was comfortably eclipsed.

"His works from this period are supremely modern, timeless and of great universal appeal, making this precisely the type of painting that today's international collectors are prepared to lock horns over, as they did this evening," said Helena Newman, head of Sotheby's impressionist and modern art in Europe.

The next highest price went to Pablo Picasso's "Homme Assis" which sold for $9.8 million, again just above the low estimate but falling short after the buyer's premium is subtracted.

A Henry Moore sculpture, "Mother and Child With Apple", was one of the few star performers on a night when 15 of the 48 lots on offer went unsold. It raised $5.8 million, well above pre-sale expectations of $2.8 million - $4.4 million.

The London summer sales continue on Wednesday with the equivalent sale at Sotheby's rival Christie's. There, the 71 lots on offer are expected to raise between $136.1 million and $199.3 million.

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