The Sensex is now down 439 points at 9037.Bajaj Auto has tumbled over 10% to Rs 2,124. HDFC have dropped 8.5% to Rs 1,029, and Hero Honda has shed 8% to Rs 650.While HDFC Bank has plunged 6.6% to Rs 650, Tata Steel has slipped over 6% to Rs 400.Reliance Energy, ICICI Bank and Satyam are the other major losers.Out of 2,173 stocks traded so far, 1,949 have declined, 190 have advanced and 34 are unchanged.