Stockbroking platform Zerodha will buy back employee stock options worth ₹60-65 crore from around 700 employees this year at a self-assessed enterprise valuation of over ₹7,000 crore ($1 billion). Zerodha will buy back shares at over four times the book value, at around ₹700 per share. The company will allow 5-50% of options vesting this year, The Economic Times reported.