Shares of the country's largest tractor and sports utility vehicle - Mahindra & Mahindra have so far this year surged a whopping 26 per cent to hit fresh 52-week high of Rs 1,057.75 compared with 6 per cent decline in the Nifty 50 index. The stock has been ranked outperformer and is among the top five gainers in the Nifty 50 index so far this year despite heightened volatility in the markets.