I've known several senior executives in Silicon Valley and they all had many offshore stocks. Once you got to know them, they freely admitted it (they were legal, and set up by the Big 3 or Big 5 accounting firms.) But they usually didn't talk about how offshore stocks were also used to "reward" competitors for killing the right products, or dropping prices against other competitors. And they were also used to finance other offshore companies providing fake services to the US-based companies - so that profit could be turned to loss and hidden offshore for individual executives or groups of executives. This has been standard practice for decades.
And people wonder why the .1% has so much of our society's money -- while others claim that it is just free market economy working fairly. I wish they would catch a clue and make these financial instruments illegal except in very rare and transparent cases.