Thanks a lot! I appreciate the quick and informative explanation, especially since this guide is 4 years old!

PS: You can make about 10 company, after game possible to crash, so you can't repeat it to infinite time.

Make company, take loan, buy back bonds with company money, sell your own stocks at market, make new company, take loan, buy back bonds, sell your own stocks, buy back first company stocks back, merge with high price and profit.
In short, it works because when time not ticking, your company valued equal as how much money was investment at start, so if you make 1 million $ company with 10k bonds, 1k bonds worth 100k, but when you starting buying back, value go upwards. So with your company money, you make this bonds more valueable, so you make personal profit here. With your personal profit, you make new company, make your bonds again more valueable, sell new ones, buy back old ones, what money left at company merge with super high price, so what you bonds bought at 1x, can be 2x, so you doubled your money. Always take a loan, because it's free money to spend buying back bonds/merge with your last company.

Watching this is hurting my head, could you explain the process?

Thank you! I don't know this method new or old, maybe I find first after so many years. Yes, we can call cheating, but wonderfull how this can work at this game's universum. And I hope only here, not at real life.

A nice find, though it is basically cheating :)