Invest in these right before the missions:whats the best one you recommend? I have done 1 mission so far for lester as Franklin.
Mission 1. Betapharm
Mission2. Debonaire Cigs
Mission 3. Fruit
Mission 4.Vapid Motor Company (don't invest in this until after the mission. It drops in price by half letting you double up your return. 100% profit.
Mission 5. Gold Coast Dev (did this last night which after about 1-2 game days gave me an 82% profit that dropped back to 40% right after).
Either sell right away or sit on the stocks for a bit for them to go up. Make sure you have a backup save in case you wait it out too long. The companies are spread throughout the LCN and BAWSAQ.