Investor wealth dropped Rs 3,20,633.05 cr on the first day of the new financial year as selling resumed in the equity market. The Sensex tanked 1,203.18 points or 4.08 per cent to close at 28,265.31 on Wednesday. Tracking weakness in equities, the market capitalisation of the BSE-listed companies eroded by Rs 3,20,633.05 cr to reach Rs 1,10,28,123.54 cr.