One can buy 1 share of company and tender it during buyback. Chances are it will be accepted, whereas for multiple shareholders acceptance ratio may be different. In case of GPIL with current price of 1100, one can expect Rs 300 gains if buyback goes through. This gain is totally tax free. So, if someone maintains say 6 accounts of family and friends, 1 share strategy will yield 1800 Rs tax free gains.