Violating the pattern day trading rule can be a costly mistake for active investors. For the uninitiated, it can result in trading restrictions or a locked account. And when that happens, any holdings ...

For more than two decades, one single number has quietly defined who actively trades in U.S. markets: $25,000. That’s the minimum equity a retail investor must maintain to freely day trade under the ...

A bizarre "Rule of Four" has been identified in the basic structure of the majority of inorganic materials—and scientists are stumped as to why. The pattern is found in the so-called "unit cell" of ...