The Dow closed above 40,000. The big number means little for your 401(k)

Even if the Dow's topping the 40,000 level is cause for celebration, it doesn't inherently mean much. What's more important is that it's one of the examples showing how the broader U.S. stock market is setting records.

Under Armour was a real threat to Nike. Now it's fighting to stay relevant

It was once hyped as a worthy rival to Nike. But at present, Under Armour, founded by a 23-year-old former college athlete, is struggling to "just do it."