Overseas investors bought shares of financial services firms worth ₹17,671 crore in May, their highest monthly purchase in the sector in the last 29 months, according to Primeinfobase.com data. They purchased auto and auto components shares worth ₹8,700 crore, the highest monthly buy in over 10 years. FPIs bought shares worth ₹41,207 crore in May, the data showed.