HONG KONG, April 27 (Reuters) - Hong Kong shares could start higher on Friday, tracking Wall Street gains spurred by strong U.S. housing data, but are set for their first weekly loss in four in turnover that has remained consistently thin all week. Bank of China, the mainland's third-largest lender by market value, may be in focus after it posted late on Thursday a 9.8 percent rise in quarterly profit that underwhelmed estimates. Its disappointing earnings set a muted tone for its three peers that report on Friday, with Chinese banks facing growing pressure as more borrowers struggle to repay loans in the face of a slowing economy. Several other companies are also expected to post earnings results, including Aluminum Corporation of China Ltd (CHALCO) , Ping An Insurance (Group) Co of China Ltd and China Shenhua Energy Co Ltd. Haitong Securities Co Ltd, China's second-biggest brokerage by assets, is set to make its Hong Kong listing debut on Friday. It had priced its $1.7 billion initial share offering near the bottom of an indicative range last Friday.