Canara Bank, Shankara Building Products, and Tata Chemicals shares have turned ex-dividend with respect to the dividends announced by the companies. Canara Bank approved a dividend of Rs 12 per share, Shankara Building Products declared Rs 2.5 per share dividend, and Tata Chemicals announced a dividend of Rs 17.50 per share. Shares of companies usually trade ex-dividend on the day or a day before the record date.