Well if you look at how you get compensated at a FAANG company you get
- salary
- bonus
- equity(in the form of restricted shares)
Note that the last one is often the kicker that can make you money. if your company does well this last component can dwarf all the others.
So maybe start by looking at who compensates in the same manner:
- Hedge Funds
- Bulge Bracket firms on Wall Street
- Lower status tech companies (your Twitter, Dropbox, etc), note, not intending to insult these companies, just pointing out that they aren't as desirable places to work as FAANG's.
- ICO funded companies. They have sooooo much money and they'll spend it all.
If you want to h ave a comfortable retirement then diversify your portfolio.
If you want to be wealthy then you usually have to concentrate. Look at all the wealthy people you know, almost all will have earned their wealth from a single source. They tend to diversify later on in life.