Sears Holdings is closing an additional 20 money-losing stores, a sign of the mounting problems faced by the iconic but troubled retailer.

NEW YORK — Sears Holdings is closing an additional 20 money-losing stores, a sign of the mounting problems faced by the iconic but troubled retailer.

The move includes 18 Sears stores and two Kmart stores. The plan was disclosed early Friday in a filing by Seritage Growth Properties, the landlord for more than 200 Sears and Kmart properties.

“Sears Holdings continues to actively manage our real estate portfolio to identify additional opportunities for reconfiguration and reduction of capital obligations,” Sears said in a statement. It said it will begin liquidation sales next weekend and that the stores are expected to close by mid-September. The company did not give details as to which…