Sotheby's has purchased a 25% stake in RM Auctions, an auctioneer of collectible cars, noting that "the market for investment-quality motor cars has never been stronger."

Sotheby's said the two companies have synergies including "significant overlap of top collectors and a focus on new markets."

A statement from Sotheby's didn't state the price of the transaction.

Sotheby's has previously collaborated with RM on automotive sales, including the November 2013 Art of the Automobile auction in New York, which brought in $62.8 million, including a $14.3 million sale of a 1964 Ferrari 250 LM.

RM Auctions, which will be called RM Sotheby's, will hold a March 14 auction in Amelia Island, Fla.

Sotheby's said it may eventually increase its ownership stake.

In November, William Ruprecht agreed to step down as chief executive when a successor is in place. Activist investor Dan Loeb, who joined the board last year, had campaigned publicly for a leaner, more-profitable company and criticized Mr. Ruprecht in a letter he released publicly before reaching a truce with the board in June.

Also in November, the company said its third-quarter loss narrowed as it benefited from lower costs and a higher tax benefit that offset a decline in revenue.

Write to Josh Beckerman at josh.beckerman@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

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