While downside in the stock market isn't something most investors look forward to, it's the ideal scenario for Warren Buffett's cash-rich company. Berkshire Hathaway closed out the September quarter with a record $325.2 billion in cash, cash equivalents, and U.S. Treasuries.

But this picture doesn't tell the whole story. In fact, Nu as a company has a very bright future. And patient shareholders, which by the way includes Warren Buffett's Berkshire Hathaway, could score big with this little-known growth stock.

Whenever big Wall Street players speak on their market views, retail investors can revere engineer what these views and opinions actually mean. Today, a view (or rather, a warning) comes from Warren Buffett himself,