Map of Roschitz on Almost every illiquid stock that has any movement in it at all has very large spreads of .50 to one full point. Stay away from stocks like this at all costs unless it is one that has just invented the cure for cancer in the last 10 minutes! GOLDEN RULE #4: USE CAUTION WITH STOCKS WITH SPREADS OVER .25 This rule is in place to limit your losses. Any stock that changes the spread dramatically should be avoided. I have been in trades that can be under heavy buying when the market maker drops the bid .35 as he sees selling orders hammering his bid price. Map of Roschitz 2016.