Alphabet overtook Apple as America's second most-valuable company on Wednesday, and shares continued to rise Thursday, ...

Versant shares fell after they started trading on the stock market Monday, completing the company's spin-off from former parent Comcast.

Discover how market efficiency influences investment decisions and why it benefits index investors. Learn about the Efficient Market Hypothesis and its real-world implications.

Terry Lane is a writer for Investopedia with 25 years of experience in journalism and communications. He covers personal finance, Congress, government regulations, and economics. Spencer Platt/Getty ...

Kara Greenberg is a senior news editor for Investopedia, where she does work writing, editing, and assigning daily markets and investing news. Prior to joining Investopedia, Kara was a researcher and ...