Sears Holdings fell 8%, losing ground as investors assessed the potential long-term impact of its announcement yesterday discussing further steps in its ongoing strategy to continue its transformation. The company said Thursday that it would close 150 more unprofitable Kmart and Sears stores, along with selling its Craftsman tool and equipment business for $775 million, and raising its borrowing capacity by $1 billion through a new real-estate-backed loan and letter-of-credit facility.