Extending its southward journey for the third straight session,two-wheeler major Bajaj Auto has lost over 10 per cent during the period on the back of heavy selling pressure on disappointing monthly sales figure. The company's scrip has come down to Rs 1,377.80 i.e today's closing price from Rs 1,476.65 as on Monday's closing figure on the Bombay Stock Exchange,translating into a dip of 10.61 per cent. Meanwhile,the stock ended the day with a loss of 3.69 per cent at Rs 1,377.80 emerging as the top loser among the Sensex blue-chip firms. During the day,the stock had plunged by 4.18 per cent to hit a month low of Rs 1,370.75. "Bajaj Auto fell for the third consecutive trading day,as its monthly sales numbers did not meet the street expectations," Globe Capital PMS Head KK Mittal said. On the National Stock Exchange,Bajaj close at Rs 1,380,down 3.48 per cent. In terms of volume,17 lakh shares of the company were traded on the two bourses. In the sales figure data released on Monday,the company had sold 2,43,675 units in the motorcycle segment in December 2010,a rise of 11 per cent as against 2,19,920 units sold in the same month of previous year. On the commercial vehicle category,the company witnessed a marginal increase of five per cent. Bajaj Auto had sold 33,128 units in December 2010,as against 31,575 units in the same month of previous year. Besides,other major auto counters,including Hero Honda and Tata Motors too slipped into red,falling 3.60 per cent and 1.39 per cent,respectively. Meanwhile,the BSE barometer Sensex finished the day at 20,301.10,down 197.62 points.