Kai's weekly chat about the week in business news.

Nasdaq bring in cash from trades but also sells information and software.

In 2011, the FBI discovered dangerous software that was likely Russian in origin.

Nasdaq will pay out a total of $41.6 million in claims related to the Facebook IPO troubles.

Marketplace's Lizzie O'Leary and John Carney from CNBC say that the optimism to end this year could help kick-off 2014.

Facebook will be added to the S&P 500. So what exactly does that mean?

The record-high Dow performance means something to the trading and investing community, but to you and me?

Twitter plans to go public and trade shares under the ticket symbol "TWTR". More details about the company emerge as it has made public its papers for an S-1 Initial Public Offering.

Twitter’s a tech company, right? And tech companies list on the Nasdaq, right? So what the heck is Twitter doing listing on the NYSE?