El Segundo, Calif., Big 5 Sporting Goods Corp. said Nasdaq has given it another extension, this one until Aug. 31, to file financial statements for past periods. The retailer risks being delisted if it fails to meet the latest deadline. Earlier this week, Big 5 hired a new CFO, Barry D. Emerson, who will start in early September. His hiring comes after the company said earlier this month it was seeking a new CFO with a strong accounting background, given its financial reporting problems. The company is in the midst of correcting accounting errors related to accounts payable and leases, among other items.