Amazon is taking an increasingly aggressive stance in logistics and transportation, as recent reports from delivery giant XPO suggest. But Amazon's ambitions also carry some risks.

A changing market structure has annihilated natural price discovery, making me more skeptical of the reliability of the charts that form the basis of technical analysis.

Berkshire Hathaway Earns $4 billion in 2018 using accounting rules warned of in 2017; gets hit by Kraft Heinz loss.

'Prices are sky-high for businesses possessing decent long-term prospects,' Berkshire Hathaway chair says in annual shareholder letter.

Federal Reserve Vice Chairman Richard Clarida tells a monetary-policy conference in New York that the central bank is considering whether to let inflation run above its 2% target to compensate for past periods of muted price increases.

Here's what the Berkshire Hathaway chief had to say.

The sell decision is highly dependent on time frame, style and other subjective considerations.

Here's why we don't yet have true AI, according to Zeta Global's CEO.

Stamps.com ends its partnership with the U.S. Postal Service over the online shipper's demands for more independence.

The Nasdaq is now up nine weeks in a row, but what was most notable this week was the excellent stock-picking.