what determines how far apart strike prices are 
strike prices for listed options are set by criteria established by the occ or an exchange typically with a 2 50 distance for strikes below 25 5 increments for those trading from 25 through 200 and 10 increments for strikes above 200 2the strikes will generally be wider for stocks with higher prices and with less liquidity or trading activity new strikes may also be requested to be added by contacting the occ or an exchange 