The game already tells you to do this, but for the fam that needs help here's a short guide.
GTA 5 Stock Tips Cheats Guide
There are a great many activities
Grand Theft Auto 5 players can get up to including tennis, property buying, maybe some actual crimes, and taking a gamble on the game's stock market.
Over on
Reddit, users have complied a list of the game's companies and their competitors suggesting the best course of action is to rob one firm and invest in its rival.
The list of the game's main companies and their competitors is below.
<li style="margin: 0px; padding: 0px;"> CoolBeans - BeanMachine
<li style="margin: 0px; padding: 0px;"> Burgershot - Up-An-Atom
<li style="margin: 0px; padding: 0px;"> Clucking Bell - TacoBomb
<li style="margin: 0px; padding: 0px;"> FlyUS - AirEmu
<li style="margin: 0px; padding: 0px;"> GoPostal - PostOP
<li style="margin: 0px; padding: 0px;"> Bilkington - DollarPills
<li style="margin: 0px; padding: 0px;"> Pisswasser - Logger
<li style="margin: 0px; padding: 0px;"> MazeBank - BankOfLiberty
<li style="margin: 0px; padding: 0px;"> Redwood - Debonaire
<li style="margin: 0px; padding: 0px;"> Slaughter, Slaughter & Slaughter - Bullhead
<li style="margin: 0px; padding: 0px;"> RadioLosSantos - WorldwideFM
<li style="margin: 0px; padding: 0px;"> eCola - Raine
For example, at one point you're given a mission to kill a cigarette company's boss. Now would be the optimal time to invest in the other cigarette company is Los Santos. Lester mentions that people who invested in the rival cigarrete company to Redwood Cigarettes - Debonaire - get a lot of money after successfully completing that mission.