(Corrects year-ago figure in paragraph 2 to 0.79 percent)
MUMBAI, July 19 Housing Development Finance Corp (HDFC), India's biggest mortgage lender, said its net interest margin - a key gauge of profitability for lenders - stood at 3.9 percent for the quarter ended June 30.
Gross non-performing loans for the April-June quarter stood at 0.77 percent of the loan portfolio as at June 30 compared with 0.79 percent a year ago, the company said in a statement to the stock exchange.
Earlier in the day, HDFC reported a 17 percent rise in net profit for the June quarter at 11.73 billion rupees ($196.8 million), helped by higher disbursals, but missed estimates. ($1 = 59.6050 Indian rupees) (Reporting by Aditi Shah; Editing by Gopakumar Warrier)