Shares of Samvardhana Motherson International Ltd plunged 10.94 per cent to trade at ₹68.40 on the NSE in Thursday's intra-day trade after promoter Sumitomo Wiring Systems sold 3.4 per cent stake in the company through block deals to fund partial debt repayment. SWS, the Japan-headquartered promoter firm, held nearly 17.55 per cent stake in Samvardhana Motherson as of December quarter, …