 Fashion retailer Asos ASC, -14.99 plunged 15 in early London trading after a profit warning and announcing the surprise departure of its chief executive. Citing supply-chain issues and higher costs, Asos said fiscal year adjusted pretax profit would fall to a range of 110 million to 140 million, from 193.6 million in the August-ending fiscal year, with first half sales in the single-digit growth range. 