Sotheby’s is taking an aggressive stance prior to the next major sales seasons in London in October and New York in November. The auctioneer has doubled the “maximum permissible amount of net outstanding auction guarantees,” the amounts guaranteed to consignors, from $300 million to $600 million, according to an SEC filing on August 25.

The auction house has also increased its liability from $600 million to $850 million in “aggregate commitments under the credit agreements,” according to the filing.