Meet the world's secretive billionaires who give stealth wealth a whole new meaning, from Ike Perlmutter to Philip Anschutz

• Stealth wealth is all the rage when it comes to fashion, but for some billionaires, it's a way of life.
• These mega-rich personalities are notorious for avoiding the public eye.
• Here's a look at some of the most reclusive billionaires — that we know about.

It's a rare day that passes without a headline about Elon Musk, Mark Zuckerberg, Jeff Bezos, or any number of the other flashy and seemingly press-loving billionaires.