NEW YORK, Dec 10 - Specialty finance company Ellington Financial LLC postponed its initial public offering indefinitely on Thursday due to market conditions, according to an underwriter.

Also on Thursday, vehicle auctioneer KAR Auction Services Inc priced its shares at $12 each, below the expected range of $15-17. It sold 25 million shares, raising roughly $300 million. KAR had originally planned to sell 23 million shares. (Reporting by Clare Baldwin; editing by Carol Bishopric)