The Sensex at the Bombay Stock Exchange closed with a marginal loss of 15 points, or 0.1 percent, at 19,687, today, on profit-booking by investors, and as high global crude oil prices stoked inflation and interest rate concerns. But the Nifty at the National Stock Exchange managed to inch up 2 points, to 5,910.Stock markets in Japan, South Korea and Singapore ended mixed.